#
# Copyright © 2012 - 2020 Michal Čihař <michal@cihar.com>
#
# This file is part of Weblate <https://weblate.org/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#


import copy
import json
from datetime import date, datetime, timedelta

from crispy_forms.bootstrap import InlineRadios, Tab, TabHolder
from crispy_forms.helper import FormHelper
from crispy_forms.layout import HTML, Div, Field, Fieldset, Layout
from django import forms
from django.conf import settings
from django.core.exceptions import NON_FIELD_ERRORS, PermissionDenied, ValidationError
from django.core.validators import FileExtensionValidator
from django.db.models import Q
from django.forms import model_to_dict
from django.forms.utils import from_current_timezone
from django.template.loader import render_to_string
from django.urls import reverse
from django.utils import timezone
from django.utils.encoding import force_str, smart_str
from django.utils.html import escape
from django.utils.http import urlencode
from django.utils.safestring import mark_safe
from django.utils.translation import gettext
from django.utils.translation import gettext_lazy as _
from django.utils.translation import pgettext_lazy
from translation_finder import DiscoveryResult, discover

from weblate.auth.models import User
from weblate.checks.models import CHECKS
from weblate.formats.exporters import EXPORTERS
from weblate.formats.models import FILE_FORMATS
from weblate.lang.models import Language
from weblate.machinery import MACHINE_TRANSLATION_SERVICES
from weblate.trans.defines import COMPONENT_NAME_LENGTH, GLOSSARY_LENGTH, REPO_LENGTH
from weblate.trans.filter import FILTERS, get_filter_choice
from weblate.trans.models import Announcement, Change, Component, Label, Project, Unit
from weblate.trans.specialchars import RTL_CHARS_DATA, get_special_chars
from weblate.trans.util import (
    check_upload_method_permissions,
    is_repo_link,
    sort_choices,
)
from weblate.trans.validators import validate_check_flags
from weblate.utils.errors import report_error
from weblate.utils.forms import ContextDiv, SortedSelect, SortedSelectMultiple
from weblate.utils.hash import checksum_to_hash, hash_to_checksum
from weblate.utils.search import parse_query
from weblate.utils.state import (
    STATE_APPROVED,
    STATE_CHOICES,
    STATE_EMPTY,
    STATE_FUZZY,
    STATE_READONLY,
    STATE_TRANSLATED,
)
from weblate.utils.templatetags.icons import icon
from weblate.utils.validators import validate_file_extension
from weblate.vcs.models import VCS_REGISTRY

BUTTON_TEMPLATE = """
<button class="btn btn-default {0}" title="{1}" {2}>{3}</button>
"""
RADIO_TEMPLATE = """
<label class="btn btn-default {0}" title="{1}">
<input type="radio" name="{2}" value="{3}" {4}/>
{5}
</label>
"""
GROUP_TEMPLATE = """
<div class="btn-group btn-group-xs" {0}>{1}</div>
"""
TOOLBAR_TEMPLATE = """
<div class="btn-toolbar pull-right flip editor-toolbar">{0}</div>
"""
EDITOR_TEMPLATE = """
<div class="clearfix"></div>
<div class="translation-item"><label for="{1}">{2}</label>
{0}
{3}
<span class="pull-right flip badge length">
<span data-max="{4}" class="length-indicator">{5}</span>/{4}
</span>
</div>
"""
COPY_TEMPLATE = 'data-checksum="{0}" data-content="{1}"'


class WeblateDateInput(forms.DateInput):
    def __init__(self, datepicker=True, **kwargs):
        attrs = {"type": "date"}
        if datepicker:
            attrs["data-provide"] = "datepicker"
            attrs["data-date-format"] = "yyyy-mm-dd"
        super().__init__(attrs=attrs, format="%Y-%m-%d", **kwargs)


class WeblateDateField(forms.DateField):
    def __init__(self, datepicker=True, **kwargs):
        if "widget" not in kwargs:
            kwargs["widget"] = WeblateDateInput(datepicker=datepicker)
        super().__init__(**kwargs)

    def to_python(self, value):
        """Produce timezone aware datetime with 00:00:00 as time."""
        value = super().to_python(value)
        if isinstance(value, date):
            return from_current_timezone(
                datetime(value.year, value.month, value.day, 0, 0, 0)
            )
        return value


class ChecksumField(forms.CharField):
    """Field for handling checksum IDs for translation."""

    def __init__(self, *args, **kwargs):
        kwargs["widget"] = forms.HiddenInput
        super().__init__(*args, **kwargs)

    def clean(self, value):
        super().clean(value)
        if not value:
            return None
        try:
            return checksum_to_hash(value)
        except ValueError:
            raise ValidationError(_("Invalid checksum specified!"))


class UserField(forms.CharField):
    def clean(self, value):
        if not value:
            return None
        try:
            return User.objects.get(Q(username__iexact=value) | Q(email__iexact=value))
        except User.DoesNotExist:
            raise ValidationError(_("No matching user found."))
        except User.MultipleObjectsReturned:
            raise ValidationError(_("More users matched."))


class QueryField(forms.CharField):
    def __init__(self, **kwargs):
        if "label" not in kwargs:
            kwargs["label"] = _("Query")
        if "required" not in kwargs:
            kwargs["required"] = False
        super().__init__(**kwargs)

    def clean(self, value):
        if not value:
            if self.required:
                raise ValidationError(_("Missing query string."))
            return ""
        try:
            parse_query(value)
            return value
        except Exception as error:
            report_error()
            raise ValidationError(_("Failed to parse query string: {}").format(error))


class FlagField(forms.CharField):
    default_validators = [validate_check_flags]


class PluralTextarea(forms.Textarea):
    """Text area extension which possibly handles plurals."""

    def __init__(self, *args, **kwargs):
        self.profile = None
        super().__init__(*args, **kwargs)

    def get_rtl_toolbar(self, fieldname):
        groups = []

        # Special chars
        chars = []
        for name, char, value in RTL_CHARS_DATA:
            chars.append(
                BUTTON_TEMPLATE.format(
                    "specialchar",
                    name,
                    'data-value="{}"'.format(
                        value.encode("ascii", "xmlcharrefreplace").decode("ascii")
                    ),
                    char,
                )
            )

        groups.append(GROUP_TEMPLATE.format("", "\n".join(chars)))

        # RTL/LTR switch
        rtl_name = "rtl-{0}".format(fieldname)
        rtl_switch = [
            RADIO_TEMPLATE.format(
                "direction-toggle active",
                gettext("Toggle text direction"),
                rtl_name,
                "rtl",
                'checked="checked"',
                "RTL",
            ),
            RADIO_TEMPLATE.format(
                "direction-toggle",
                gettext("Toggle text direction"),
                rtl_name,
                "ltr",
                "",
                "LTR",
            ),
        ]
        groups.append(
            GROUP_TEMPLATE.format('data-toggle="buttons"', "\n".join(rtl_switch))
        )
        return TOOLBAR_TEMPLATE.format("\n".join(groups))

    def get_toolbar(self, language, fieldname, unit, idx):
        """Return toolbar HTML code."""
        profile = self.profile
        groups = []
        plurals = unit.get_source_plurals()
        if idx and len(plurals) > 1:
            source = plurals[1]
        else:
            source = plurals[0]
        # Copy button
        groups.append(
            GROUP_TEMPLATE.format(
                "",
                BUTTON_TEMPLATE.format(
                    "copy-text",
                    gettext("Fill in with source string"),
                    COPY_TEMPLATE.format(unit.checksum, escape(json.dumps(source))),
                    "{} {}".format(icon("clone.svg"), gettext("Clone source")),
                ),
            )
        )

        # Special chars
        chars = [
            BUTTON_TEMPLATE.format(
                "specialchar",
                name,
                'data-value="{}"'.format(
                    value.encode("ascii", "xmlcharrefreplace").decode("ascii")
                ),
                char,
            )
            for name, char, value in get_special_chars(
                language, profile.special_chars, unit.source
            )
        ]

        groups.append(GROUP_TEMPLATE.format("", "\n".join(chars)))

        result = TOOLBAR_TEMPLATE.format("\n".join(groups))

        if language.direction == "rtl":
            result = self.get_rtl_toolbar(fieldname) + result

        return result

    def render(self, name, value, attrs=None, renderer=None, **kwargs):
        """Render all textareas with correct plural labels."""
        unit = value
        values = unit.get_target_plurals()
        lang = unit.translation.language
        plural = unit.translation.plural
        tabindex = self.attrs["tabindex"]

        # Need to add extra class
        attrs["class"] = "translation-editor form-control"
        attrs["tabindex"] = tabindex
        attrs["lang"] = lang.code
        attrs["dir"] = lang.direction
        attrs["rows"] = 3
        attrs["maxlength"] = unit.get_max_length()
        if unit.readonly:
            attrs["readonly"] = 1

        # Okay we have more strings
        ret = []
        base_id = "id_{0}".format(unit.checksum)
        for idx, val in enumerate(values):
            # Generate ID
            fieldname = "{0}_{1}".format(name, idx)
            fieldid = "{0}_{1}".format(base_id, idx)
            attrs["id"] = fieldid
            attrs["tabindex"] = tabindex + idx

            # Render textare
            textarea = super().render(fieldname, val, attrs, renderer, **kwargs)
            # Label for plural
            label = force_str(unit.translation.language)
            if len(values) != 1:
                label = "{}, {}".format(label, plural.get_plural_label(idx))
            ret.append(
                EDITOR_TEMPLATE.format(
                    self.get_toolbar(lang, fieldid, unit, idx),
                    fieldid,
                    label,
                    textarea,
                    attrs["maxlength"],
                    len(val),
                )
            )

        # Show plural formula for more strings
        if len(values) > 1:
            ret.append(
                render_to_string("snippets/plural-formula.html", {"plural": plural})
            )

        # Join output
        return mark_safe("".join(ret))

    def value_from_datadict(self, data, files, name):
        """Return processed plurals as a list."""
        ret = []
        for idx in range(0, 10):
            fieldname = "{0}_{1:d}".format(name, idx)
            if fieldname not in data:
                break
            ret.append(data.get(fieldname, ""))
        return [smart_str(r.replace("\r", "")) for r in ret]


class PluralField(forms.CharField):
    """Renderer for the plural field.

    The only difference from CharField is that it does not force value to be string.
    """

    def __init__(self, max_length=None, min_length=None, **kwargs):
        kwargs["label"] = ""
        super().__init__(widget=PluralTextarea, **kwargs)

    def to_python(self, value):
        """Return list or string as returned by PluralTextarea."""
        return value

    def clean(self, value):
        value = super().clean(value)
        if not value:
            raise ValidationError(_("Missing translated string!"))
        return value


class FilterField(forms.ChoiceField):
    def __init__(self, *args, **kwargs):
        kwargs["label"] = _("Search filter")
        if "required" not in kwargs:
            kwargs["required"] = False
        kwargs["choices"] = get_filter_choice()
        kwargs["error_messages"] = {
            "invalid_choice": _("Please choose a valid filter type.")
        }
        super().__init__(*args, **kwargs)

    def to_python(self, value):
        if value == "untranslated":
            return "todo"
        return super().to_python(value)


class ChecksumForm(forms.Form):
    """Form for handling checksum IDs for translation."""

    checksum = ChecksumField(required=True)

    def __init__(self, translation, *args, **kwargs):
        self.translation = translation
        super().__init__(*args, **kwargs)

    def clean_checksum(self):
        """Validate whether checksum is valid and fetches unit for it."""
        if "checksum" not in self.cleaned_data:
            return

        unit_set = self.translation.unit_set

        try:
            self.cleaned_data["unit"] = unit_set.filter(
                id_hash=self.cleaned_data["checksum"]
            )[0]
        except (Unit.DoesNotExist, IndexError):
            raise ValidationError(
                _("The string you wanted to translate is no longer available.")
            )


class FuzzyField(forms.BooleanField):
    help_as_icon = True

    def __init__(self, *args, **kwargs):
        kwargs["label"] = _("Needs editing")
        kwargs["help_text"] = _(
            'Strings are usually marked as "Needs editing" after the source '
            "string is updated, or when marked as such manually."
        )
        super().__init__(*args, **kwargs)
        self.widget.attrs["class"] = "fuzzy_checkbox"


class TranslationForm(ChecksumForm):
    """Form used for translation of single string."""

    contentsum = ChecksumField(required=True)
    translationsum = ChecksumField(required=True)
    target = PluralField(required=False)
    fuzzy = FuzzyField(required=False)
    review = forms.ChoiceField(
        label=_("Review state"),
        choices=[
            (STATE_FUZZY, _("Needs editing")),
            (STATE_TRANSLATED, _("Waiting for review")),
            (STATE_APPROVED, _("Approved")),
        ],
        required=False,
        widget=forms.RadioSelect,
    )

    def __init__(self, user, translation, unit, *args, **kwargs):
        if unit is not None:
            kwargs["initial"] = {
                "checksum": unit.checksum,
                "contentsum": hash_to_checksum(unit.content_hash),
                "translationsum": hash_to_checksum(unit.get_target_hash()),
                "target": unit,
                "fuzzy": unit.fuzzy,
                "review": unit.state,
            }
            kwargs["auto_id"] = "id_{0}_%s".format(unit.checksum)
        tabindex = kwargs.pop("tabindex", 100)
        super().__init__(translation, *args, **kwargs)
        self.user = user
        self.fields["target"].widget.attrs["tabindex"] = tabindex
        self.fields["target"].widget.profile = user.profile
        self.fields["review"].widget.attrs["class"] = "review_radio"
        # Avoid failing validation on not translated string
        if args:
            self.fields["review"].choices.append((STATE_EMPTY, ""))
        self.helper = FormHelper()
        self.helper.form_method = "post"
        self.helper.form_tag = False
        self.helper.disable_csrf = True
        self.helper.layout = Layout(
            Field("checksum"),
            Field("target"),
            Field("fuzzy"),
            Field("contentsum"),
            Field("translationsum"),
            InlineRadios("review"),
        )
        if unit and user.has_perm("unit.review", unit.translation):
            self.fields["fuzzy"].widget = forms.HiddenInput()
        else:
            self.fields["review"].widget = forms.HiddenInput()

    def clean(self):
        super().clean()

        # Check required fields
        required = {"unit", "target", "contentsum", "translationsum"}
        if not required.issubset(self.cleaned_data):
            return

        unit = self.cleaned_data["unit"]

        if self.cleaned_data["contentsum"] != unit.content_hash:
            raise ValidationError(
                _(
                    "Source string has been changed meanwhile. "
                    "Please check your changes."
                )
            )

        if self.cleaned_data["translationsum"] != unit.get_target_hash():
            raise ValidationError(
                _(
                    "Translation of the string has been changed meanwhile. "
                    "Please check your changes."
                )
            )

        max_length = unit.get_max_length()
        for text in self.cleaned_data["target"]:
            if len(text) > max_length:
                raise ValidationError(_("Translation text too long!"))
        if self.user.has_perm(
            "unit.review", unit.translation
        ) and self.cleaned_data.get("review"):
            self.cleaned_data["state"] = int(self.cleaned_data["review"])
        elif self.cleaned_data["fuzzy"]:
            self.cleaned_data["state"] = STATE_FUZZY
        else:
            self.cleaned_data["state"] = STATE_TRANSLATED


class ZenTranslationForm(TranslationForm):
    def __init__(self, user, translation, unit, *args, **kwargs):
        super().__init__(user, translation, unit, *args, **kwargs)
        self.helper.form_action = reverse(
            "save_zen", kwargs=translation.get_reverse_url_kwargs()
        )
        self.helper.form_tag = True
        self.helper.disable_csrf = False


class AntispamForm(forms.Form):
    """Honeypot based spam protection form."""

    content = forms.CharField(required=False)

    def clean_content(self):
        """Check if content is empty."""
        if self.cleaned_data["content"] != "":
            raise ValidationError("Invalid value")
        return ""


class DownloadForm(forms.Form):
    q = QueryField()
    format = forms.ChoiceField(
        label=_("File format"),
        choices=[(x.name, x.verbose) for x in EXPORTERS.values()],
        initial="po",
        required=True,
        widget=forms.RadioSelect,
    )


class SimpleUploadForm(forms.Form):
    """Base form for uploading a file."""

    file = forms.FileField(label=_("File"), validators=[validate_file_extension])
    method = forms.ChoiceField(
        label=_("File upload mode"),
        choices=(
            ("translate", _("Add as translation")),
            ("approve", _("Add as approved translation")),
            ("suggest", _("Add as suggestion")),
            ("fuzzy", _("Add as translation needing edit")),
            ("replace", _("Replace existing translation file")),
            ("source", _("Update source strings")),
        ),
        widget=forms.RadioSelect,
    )
    fuzzy = forms.ChoiceField(
        label=_("Processing of strings needing edit"),
        choices=(
            ("", _("Do not import")),
            ("process", _("Import as string needing edit")),
            ("approve", _("Import as translated")),
        ),
        required=False,
    )

    @staticmethod
    def get_field_doc(field):
        return ("user/files", "upload-{}".format(field.name))

    def remove_translation_choice(self, value):
        """Remove add as translation choice."""
        choices = self.fields["method"].choices
        self.fields["method"].choices = [
            choice for choice in choices if choice[0] != value
        ]


class UploadForm(SimpleUploadForm):
    """Upload form with option to overwrite current messages."""

    upload_overwrite = forms.BooleanField(
        label=_("Overwrite existing translations"),
        help_text=_(
            "Whether to overwrite existing translations if the string is "
            "already translated."
        ),
        required=False,
        initial=True,
    )


class ExtraUploadForm(UploadForm):
    """Advanced upload form for users who can override authorship."""

    author_name = forms.CharField(label=_("Author name"))
    author_email = forms.EmailField(label=_("Author e-mail"))


def get_upload_form(user, translation, *args, **kwargs):
    """Return correct upload form based on user permissions."""
    project = translation.component.project
    if user.has_perm("upload.authorship", project):
        form = ExtraUploadForm
        kwargs["initial"] = {"author_name": user.full_name, "author_email": user.email}
    elif user.has_perm("upload.overwrite", project):
        form = UploadForm
    else:
        form = SimpleUploadForm
    result = form(*args, **kwargs)
    for method in [x[0] for x in result.fields["method"].choices]:
        if not check_upload_method_permissions(user, translation, method):
            result.remove_translation_choice(method)
    return result


class SearchForm(forms.Form):
    """Text searching form."""

    # pylint: disable=invalid-name
    q = QueryField()
    checksum = ChecksumField(required=False)
    offset = forms.IntegerField(min_value=-1, required=False, widget=forms.HiddenInput)

    def __init__(self, user, *args, **kwargs):
        """Generate choices for other component in same project."""
        self.user = user
        super().__init__(*args, **kwargs)

        self.helper = FormHelper(self)
        self.helper.disable_csrf = True
        self.helper.form_tag = False
        self.helper.layout = Layout(
            Field("q"),
            ContextDiv(
                template="snippets/query-builder.html",
                context={
                    "user": self.user,
                    "month_ago": timezone.now() - timedelta(days=31),
                },
            ),
            Field("checksum"),
            Field("offset"),
        )

    def get_name(self):
        """Return verbose name for a search."""
        return FILTERS.get_search_name(self.cleaned_data["q"])

    def get_search_query(self):
        return self.cleaned_data["q"]

    def clean_offset(self):
        if self.cleaned_data.get("offset") is None:
            self.cleaned_data["offset"] = 1
        return self.cleaned_data["offset"]

    def items(self):
        items = []
        # Skip checksum and offset as these change
        ignored = {"checksum", "offset"}
        for param in sorted(self.cleaned_data):
            value = self.cleaned_data[param]
            # We don't care about empty values or ignored
            if value is None or param in ignored:
                continue
            if isinstance(value, bool):
                # Only store true values
                if value:
                    items.append((param, "1"))
            elif isinstance(value, int):
                # Avoid storing 0 values
                if value > 0:
                    items.append((param, str(value)))
            elif isinstance(value, datetime):
                # Convert date to string
                items.append((param, value.date().isoformat()))
            elif isinstance(value, list):
                for val in value:
                    items.append((param, val))
            elif isinstance(value, User):
                items.append((param, value.username))
            else:
                # It should be string here
                if value:
                    items.append((param, value))
        return items

    def urlencode(self):
        return urlencode(self.items())

    def reset_offset(self):
        """Reset offset to avoid using form as default for new search."""
        data = copy.copy(self.data)
        data["offset"] = "1"
        data["checksum"] = ""
        self.data = data
        return self


class MergeForm(ChecksumForm):
    """Simple form for merging translation of two units."""

    merge = forms.IntegerField()

    def clean(self):
        super().clean()
        if "unit" not in self.cleaned_data or "merge" not in self.cleaned_data:
            return None
        try:
            project = self.translation.component.project
            self.cleaned_data["merge_unit"] = merge_unit = Unit.objects.get(
                pk=self.cleaned_data["merge"],
                translation__component__project=project,
                translation__language=self.translation.language,
            )
            unit = self.cleaned_data["unit"]
            if (
                unit.id_hash != merge_unit.id_hash
                and unit.content_hash != merge_unit.content_hash
                and unit.source != merge_unit.source
            ):
                raise ValidationError(_("Could not find merged string."))
        except Unit.DoesNotExist:
            raise ValidationError(_("Could not find merged string."))
        return self.cleaned_data


class RevertForm(ChecksumForm):
    """Form for reverting edits."""

    revert = forms.IntegerField()

    def clean(self):
        super().clean()
        if "unit" not in self.cleaned_data or "revert" not in self.cleaned_data:
            return None
        try:
            self.cleaned_data["revert_change"] = Change.objects.get(
                pk=self.cleaned_data["revert"], unit=self.cleaned_data["unit"]
            )
        except Change.DoesNotExist:
            raise ValidationError(_("Could not find reverted change."))
        return self.cleaned_data


class AutoForm(forms.Form):
    """Automatic translation form."""

    mode = forms.ChoiceField(
        label=_("Automatic translation mode"),
        choices=[
            ("suggest", _("Add as suggestion")),
            ("translate", _("Add as translation")),
            ("fuzzy", _("Add as needing edit")),
        ],
        initial="suggest",
    )
    filter_type = FilterField(required=True, initial="todo")
    auto_source = forms.ChoiceField(
        label=_("Automatic translation source"),
        choices=[
            ("others", _("Other translation components")),
            ("mt", _("Machine translation")),
        ],
        initial="others",
    )
    component = forms.ChoiceField(
        label=_("Components"),
        required=False,
        help_text=_(
            "Turn on contribution to shared translation memory for the project to "
            "get access to additional components."
        ),
        initial="",
    )
    engines = forms.MultipleChoiceField(
        label=_("Machine translation engines"), choices=[], required=False
    )
    threshold = forms.IntegerField(
        label=_("Score threshold"), initial=80, min_value=1, max_value=100
    )

    def __init__(self, obj, *args, **kwargs):
        """Generate choices for other component in same project."""
        # Add components from other projects with enabled shared TM
        components = obj.project.component_set.exclude(
            id=obj.id
        ) | Component.objects.filter(project__contribute_shared_tm=True).exclude(
            project=obj.project
        )

        choices = [
            (s.id, force_str(s))
            for s in components.order_project().prefetch_related("project")
        ]

        super().__init__(*args, **kwargs)

        self.fields["component"].choices = [
            ("", _("All components in current project"))
        ] + choices
        self.fields["engines"].choices = [
            (key, mt.name) for key, mt in MACHINE_TRANSLATION_SERVICES.items()
        ]
        if "weblate" in MACHINE_TRANSLATION_SERVICES.keys():
            self.fields["engines"].initial = "weblate"

        use_types = {"all", "nottranslated", "todo", "fuzzy", "check:inconsistent"}

        self.fields["filter_type"].choices = [
            x for x in self.fields["filter_type"].choices if x[0] in use_types
        ]

        self.helper = FormHelper(self)
        self.helper.layout = Layout(
            Field("mode"),
            Field("filter_type"),
            InlineRadios("auto_source", id="select_auto_source"),
            Div("component", css_id="auto_source_others"),
            Div("engines", "threshold", css_id="auto_source_mt"),
        )


class CommaSeparatedIntegerField(forms.Field):
    def to_python(self, value):
        if not value:
            return []

        try:
            return [int(item.strip()) for item in value.split(",") if item.strip()]
        except (ValueError, TypeError):
            raise ValidationError(_("Invalid integer list!"))


class OneWordForm(forms.Form):
    """Simple one-word form."""

    term = forms.CharField(
        label=_("Search"), max_length=GLOSSARY_LENGTH, required=False
    )


class WordForm(forms.Form):
    """Form for adding word to a glossary."""

    source = forms.CharField(label=_("Source"), max_length=GLOSSARY_LENGTH)
    target = forms.CharField(label=_("Translation"), max_length=GLOSSARY_LENGTH)
    words = CommaSeparatedIntegerField(widget=forms.HiddenInput, required=False)


class InlineWordForm(WordForm):
    """Inline rendered form for adding words."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        for fieldname in ("source", "target"):
            field = self.fields[fieldname]
            field.widget.attrs["placeholder"] = field.label


class DictUploadForm(forms.Form):
    """Uploading file to a dictionary."""

    file = forms.FileField(
        label=_("File"),
        validators=[validate_file_extension],
        help_text=_(
            "You can upload any format understood by "
            "Translate Toolkit (including TBX, CSV or gettext PO files)."
        ),
    )
    method = forms.ChoiceField(
        label=_("Merge method"),
        choices=(
            ("", _("Keep current")),
            ("overwrite", _("Overwrite existing")),
            ("add", _("Add as other translation")),
        ),
        required=False,
    )


class LetterForm(forms.Form):
    """Form for choosing starting letter in a glossary."""

    LETTER_CHOICES = [(chr(97 + x), chr(65 + x)) for x in range(26)]
    any_letter = pgettext_lazy("Choose starting letter in glossary", "Any")
    letter = forms.ChoiceField(
        label=_("Starting letter"),
        choices=[("", any_letter)] + LETTER_CHOICES,
        required=False,
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper(self)
        self.helper.disable_csrf = True
        self.helper.form_class = "form-inline"
        self.helper.field_template = "bootstrap3/layout/inline_field.html"


class CommentForm(forms.Form):
    """Simple commenting form."""

    scope = forms.ChoiceField(
        label=_("Scope"),
        help_text=_(
            "Is your comment specific to this "
            "translation or generic for all of them?"
        ),
        choices=(
            ("report", _("Report issue with the source string"),),
            (
                "global",
                _("Source string comment, suggestions for changes to this string"),
            ),
            (
                "translation",
                _("Translation comment, discussions with other translators"),
            ),
        ),
    )
    comment = forms.CharField(
        widget=forms.Textarea(attrs={"dir": "auto"}),
        label=_("New comment"),
        help_text=_("You can use Markdown and mention users by @username."),
        max_length=1000,
    )

    def __init__(self, translation, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Remove bug report in case source review is not enabled
        if not translation.component.project.source_review:
            self.fields["scope"].choices = self.fields["scope"].choices[1:]


class EngageForm(forms.Form):
    """Form to choose language for engagement widgets."""

    lang = forms.ChoiceField(required=False, choices=[("", _("All languages"))])
    component = forms.ChoiceField(required=False, choices=[("", _("All components"))])

    def __init__(self, project, *args, **kwargs):
        """Dynamically generate choices for used languages in project."""
        choices = [(l.code, force_str(l)) for l in project.languages]
        components = [(c.slug, c.name) for c in project.component_set.order()]

        super().__init__(*args, **kwargs)

        self.fields["lang"].choices += choices
        self.fields["component"].choices += components


class NewLanguageOwnerForm(forms.Form):
    """Form for requesting new language."""

    lang = forms.MultipleChoiceField(
        label=_("Languages"), choices=[], widget=SortedSelectMultiple
    )

    def get_lang_filter(self):
        return Q(translation__component=self.component) | Q(
            project=self.component.project
        )

    def __init__(self, component, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.component = component
        languages = Language.objects.exclude(self.get_lang_filter())
        self.fields["lang"].choices = sort_choices(
            [(l.code, "{0} ({1})".format(gettext(l.name), l.code)) for l in languages]
        )


class NewLanguageForm(NewLanguageOwnerForm):
    """Form for requesting new language."""

    lang = forms.ChoiceField(label=_("Language"), choices=[], widget=SortedSelect)

    def __init__(self, component, *args, **kwargs):
        super().__init__(component, *args, **kwargs)
        self.fields["lang"].choices = [("", _("Please choose"))] + self.fields[
            "lang"
        ].choices

    def clean_lang(self):
        # Compatibility with NewLanguageOwnerForm
        return [self.cleaned_data["lang"]]


def get_new_language_form(request, component):
    """Return new language form for user."""
    if not request.user.has_perm("translation.add", component):
        raise PermissionDenied()
    if request.user.has_perm("translation.add_more", component):
        return NewLanguageOwnerForm
    return NewLanguageForm


class ContextForm(forms.ModelForm):
    class Meta:
        model = Unit
        fields = ("extra_context", "labels", "extra_flags")
        widgets = {"labels": forms.CheckboxSelectMultiple()}

    doc_links = {
        "extra_context": ("admin/translating", "additional"),
        "labels": ("devel/translations", "labels"),
        "extra_flags": ("admin/translating", "additional"),
    }

    def get_field_doc(self, field):
        return self.doc_links[field.name]

    def __init__(self, data=None, instance=None, user=None, **kwargs):
        super().__init__(data=data, instance=instance, **kwargs)
        project = instance.translation.component.project
        self.fields["labels"].queryset = project.label_set.all()
        self.helper = FormHelper(self)
        self.helper.disable_csrf = True
        self.helper.form_tag = False
        self.helper.layout = Layout(
            Field("extra_context"),
            Field("labels"),
            ContextDiv(
                template="snippets/labels_description.html",
                context={"project": project, "user": user},
            ),
            Field("extra_flags"),
        )


class UserManageForm(forms.Form):
    user = UserField(
        label=_("User to add"),
        help_text=_(
            "Please type in an existing Weblate account name or e-mail address."
        ),
    )


class ReportsForm(forms.Form):
    style = forms.ChoiceField(
        label=_("Report format"),
        help_text=_("Choose file format for the report"),
        choices=(
            ("rst", _("reStructuredText")),
            ("json", _("JSON")),
            ("html", _("HTML")),
        ),
    )
    period = forms.ChoiceField(
        label=_("Report period"),
        choices=(
            ("30days", _("Last 30 days")),
            ("this-month", _("This month")),
            ("month", _("Last month")),
            ("this-year", _("This year")),
            ("year", _("Last year")),
            ("", _("As specified")),
        ),
        required=False,
    )
    start_date = WeblateDateField(
        label=_("Starting date"), required=False, datepicker=False
    )
    end_date = WeblateDateField(
        label=_("Ending date"), required=False, datepicker=False
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper(self)
        self.helper.form_tag = False
        self.helper.layout = Layout(
            Field("style"),
            Field("period"),
            Div(
                "start_date",
                "end_date",
                css_class="input-group input-daterange",
                data_provide="datepicker",
                data_date_format="yyyy-mm-dd",
            ),
        )

    def clean(self):
        super().clean()
        # Invalid value, skip rest of the validation
        if "period" not in self.cleaned_data:
            return

        # Handle predefined periods
        if self.cleaned_data["period"] == "30days":
            end = timezone.now()
            start = end - timedelta(days=30)
        elif self.cleaned_data["period"] == "month":
            end = timezone.now().replace(day=1) - timedelta(days=1)
            start = end.replace(day=1)
        elif self.cleaned_data["period"] == "this-month":
            end = timezone.now().replace(day=1) + timedelta(days=31)
            end = end.replace(day=1) - timedelta(days=1)
            start = end.replace(day=1)
        elif self.cleaned_data["period"] == "year":
            year = timezone.now().year - 1
            end = timezone.make_aware(datetime(year, 12, 31))
            start = timezone.make_aware(datetime(year, 1, 1))
        elif self.cleaned_data["period"] == "this-year":
            year = timezone.now().year
            end = timezone.make_aware(datetime(year, 12, 31))
            start = timezone.make_aware(datetime(year, 1, 1))
        else:
            # Validate custom period
            if not self.cleaned_data["start_date"]:
                raise ValidationError({"start_date": _("Missing date!")})
            if not self.cleaned_data["end_date"]:
                raise ValidationError({"end_date": _("Missing date!")})
            start = self.cleaned_data["start_date"]
            end = self.cleaned_data["end_date"]
        # Sanitize timestamps
        self.cleaned_data["start_date"] = start.replace(
            hour=0, minute=0, second=0, microsecond=0
        )
        self.cleaned_data["end_date"] = end.replace(
            hour=23, minute=59, second=59, microsecond=999999
        )
        # Final validation
        if self.cleaned_data["start_date"] > self.cleaned_data["end_date"]:
            msg = _("Starting date has to be before ending date!")
            raise ValidationError({"start_date": msg, "end_date": msg})


class CleanRepoMixin:
    def clean_repo(self):
        repo = self.cleaned_data.get("repo")
        if not repo or not is_repo_link(repo) or "/" not in repo[10:]:
            return repo
        project, component = repo[10:].split("/", 1)
        try:
            obj = Component.objects.get(
                slug__iexact=component, project__slug__iexact=project
            )
        except Component.DoesNotExist:
            return repo
        if not self.request.user.has_perm("component.edit", obj):
            raise ValidationError(
                _("You do not have permission to access this component!")
            )
        return repo


class SettingsBaseForm(CleanRepoMixin, forms.ModelForm):
    """Component base form."""

    class Meta:
        model = Component
        fields = []

    def __init__(self, request, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.request = request
        self.helper = FormHelper()
        self.helper.form_tag = False


class SelectChecksWidget(SortedSelectMultiple):
    def __init__(self, attrs=None, choices=()):
        choices = CHECKS.get_choices()
        super().__init__(attrs=attrs, choices=choices)

    def value_from_datadict(self, data, files, name):
        value = super().value_from_datadict(data, files, name)
        if isinstance(value, str):
            return json.loads(value)
        return value

    def format_value(self, value):
        return json.dumps(super().format_value(value))


class ComponentDocsMixin:
    @staticmethod
    def get_field_doc(field):
        return ("admin/projects", "component-{}".format(field.name))


class ProjectDocsMixin:
    @staticmethod
    def get_field_doc(field):
        return ("admin/projects", "project-{}".format(field.name))


class ComponentSettingsForm(SettingsBaseForm, ComponentDocsMixin):
    """Component settings form."""

    class Meta:
        model = Component
        fields = (
            "name",
            "report_source_bugs",
            "license",
            "agreement",
            "allow_translation_propagation",
            "enable_suggestions",
            "suggestion_voting",
            "suggestion_autoaccept",
            "check_flags",
            "enforced_checks",
            "commit_message",
            "add_message",
            "delete_message",
            "merge_message",
            "addon_message",
            "vcs",
            "repo",
            "branch",
            "push",
            "repoweb",
            "push_on_commit",
            "commit_pending_age",
            "merge_style",
            "file_format",
            "edit_template",
            "new_lang",
            "language_code_style",
            "new_base",
            "filemask",
            "template",
            "intermediate",
            "language_regex",
            "shaping_regex",
        )
        widgets = {"enforced_checks": SelectChecksWidget()}

    def __init__(self, request, *args, **kwargs):
        super().__init__(request, *args, **kwargs)
        self.helper.layout = Layout(
            TabHolder(
                Tab(
                    _("Basic"),
                    Fieldset(_("Name"), "name"),
                    Fieldset(_("License"), "license", "agreement"),
                    Fieldset(_("Upstream links"), "report_source_bugs"),
                    css_id="basic",
                ),
                Tab(
                    _("Translation"),
                    Fieldset(
                        _("Suggestions"),
                        "enable_suggestions",
                        "suggestion_voting",
                        "suggestion_autoaccept",
                    ),
                    Fieldset(
                        _("Translation settings"),
                        "allow_translation_propagation",
                        "check_flags",
                        "shaping_regex",
                        "enforced_checks",
                    ),
                    css_id="translation",
                ),
                Tab(
                    _("Version control"),
                    Fieldset(
                        _("Locations"),
                        Div(template="trans/repo_help.html"),
                        "vcs",
                        "repo",
                        "branch",
                        "push",
                        "repoweb",
                    ),
                    Fieldset(
                        _("Version control settings"),
                        "push_on_commit",
                        "commit_pending_age",
                        "merge_style",
                    ),
                    css_id="vcs",
                ),
                Tab(
                    _("Commit messages"),
                    Fieldset(
                        _("Commit messages"),
                        Div(template="trans/messages_help.html"),
                        "commit_message",
                        "add_message",
                        "delete_message",
                        "merge_message",
                        "addon_message",
                    ),
                    css_id="messages",
                ),
                Tab(
                    _("Files"),
                    Fieldset(
                        _("Translation files"),
                        "file_format",
                        "filemask",
                        "language_regex",
                    ),
                    Fieldset(
                        _("Monolingual translations"),
                        "template",
                        "edit_template",
                        "intermediate",
                    ),
                    Fieldset(
                        _("Adding new languages"),
                        "new_base",
                        "new_lang",
                        "language_code_style",
                    ),
                    css_id="files",
                ),
                template="layout/pills.html",
            )
        )
        vcses = ("git", "gerrit", "github", "gitlab", "local", "git-force-push")
        if self.instance.vcs not in vcses:
            vcses = (self.instance.vcs,)
        self.fields["vcs"].choices = [
            c for c in self.fields["vcs"].choices if c[0] in vcses
        ]


class ComponentCreateForm(SettingsBaseForm, ComponentDocsMixin):
    """Component creation form."""

    class Meta:
        model = Component
        fields = [
            "project",
            "name",
            "slug",
            "vcs",
            "repo",
            "push",
            "repoweb",
            "branch",
            "file_format",
            "filemask",
            "template",
            "edit_template",
            "intermediate",
            "new_base",
            "license",
            "new_lang",
            "language_code_style",
            "language_regex",
        ]


class ComponentNameForm(forms.Form, ComponentDocsMixin):
    name = forms.CharField(
        label=_("Component name"),
        max_length=COMPONENT_NAME_LENGTH,
        help_text=_("Display name"),
    )
    slug = forms.SlugField(
        label=_("URL slug"),
        max_length=COMPONENT_NAME_LENGTH,
        help_text=_("Name used in URLs and filenames."),
    )


class ComponentSelectForm(ComponentNameForm):
    component = forms.ModelChoiceField(
        queryset=Component.objects.none(),
        label=_("Component"),
        help_text=_("Select existing component to copy configuration from."),
    )

    def __init__(self, request, *args, **kwargs):
        if "instance" in kwargs:
            kwargs.pop("instance")
        super().__init__(*args, **kwargs)


class ComponentBranchForm(ComponentSelectForm):
    branch = forms.ChoiceField(label=_("Repository branch"))

    branch_data = {}
    instance = None

    def clean_component(self):
        component = self.cleaned_data["component"]
        self.fields["branch"].choices = [(x, x) for x in self.branch_data[component.pk]]
        return component

    def clean(self):
        form_fields = ("branch", "slug", "name")
        data = self.cleaned_data
        component = data.get("component")
        if not component or any(field not in data for field in form_fields):
            return
        kwargs = model_to_dict(component, exclude=["id"])
        kwargs["project"] = component.project
        for field in form_fields:
            kwargs[field] = data[field]
        self.instance = Component(**kwargs)
        try:
            self.instance.full_clean()
        except ValidationError as error:
            # Can not raise directly as this will contain errors
            # from fields not present here
            result = {NON_FIELD_ERRORS: []}
            for key, value in error.message_dict.items():
                if key in self.fields:
                    result[key] = value
                else:
                    result[NON_FIELD_ERRORS].extend(value)
            raise ValidationError(error.messages)


class ComponentProjectForm(ComponentNameForm):
    project = forms.ModelChoiceField(
        queryset=Project.objects.none(), label=_("Project")
    )

    def __init__(self, request, *args, **kwargs):
        if "instance" in kwargs:
            kwargs.pop("instance")
        super().__init__(*args, **kwargs)
        self.request = request
        self.helper = FormHelper()
        self.helper.form_tag = False
        self.instance = None

    def clean(self):
        if "project" not in self.cleaned_data:
            return
        project = self.cleaned_data["project"]
        name = self.cleaned_data.get("name")
        if name and project.component_set.filter(name__iexact=name).exists():
            raise ValidationError({"name": _("Entry by the same name already exists.")})
        slug = self.cleaned_data.get("slug")
        if slug and project.component_set.filter(slug__iexact=slug).exists():
            raise ValidationError({"slug": _("Entry by the same name already exists.")})


class ComponentScratchCreateForm(ComponentProjectForm):
    file_format = forms.ChoiceField(
        label=_("File format"),
        initial="po-mono",
        choices=FILE_FORMATS.get_choices(
            cond=lambda x: bool(x.new_translation) or hasattr(x, "update_bilingual")
        ),
    )


class ComponentZipCreateForm(ComponentProjectForm):
    zipfile = forms.FileField(
        label=_("ZIP file containing translations"),
        validators=[FileExtensionValidator(allowed_extensions=["zip"])],
        widget=forms.FileInput(attrs={"accept": ".zip,application/zip"}),
    )


class ComponentInitCreateForm(CleanRepoMixin, ComponentProjectForm):
    """Component creation form.

    This is mostly copy from Component model. Probably should be extracted to standalone
    Repository model...
    """

    project = forms.ModelChoiceField(
        queryset=Project.objects.none(), label=_("Project")
    )
    vcs = forms.ChoiceField(
        label=_("Version control system"),
        help_text=_(
            "Version control system to use to access your "
            "repository with translations."
        ),
        choices=VCS_REGISTRY.get_choices(exclude={"local"}),
        initial=settings.DEFAULT_VCS,
    )
    repo = forms.CharField(
        label=_("Source code repository"),
        max_length=REPO_LENGTH,
        help_text=_(
            "URL of a repository, use weblate://project/component "
            "for sharing with other component."
        ),
    )
    branch = forms.CharField(
        label=_("Repository branch"),
        max_length=REPO_LENGTH,
        help_text=_("Repository branch to translate"),
        required=False,
    )

    def clean_instance(self, data):
        params = copy.copy(data)
        if "discovery" in params:
            params.pop("discovery")

        instance = Component(**params)
        instance.clean_fields(exclude=("filemask", "file_format", "license"))
        instance.validate_unique()
        instance.clean_repo()
        self.instance = instance

        # Create linked repos automatically
        if not self.instance.is_repo_link and self.instance.vcs != "local":
            same_repo = instance.project.component_set.filter(
                repo=instance.repo, vcs=instance.vcs, branch=instance.branch
            )
            if same_repo.exists():
                component = same_repo[0]
                data["repo"] = component.get_repo_link_url()
                data["branch"] = ""
                self.clean_instance(data)

    def clean(self):
        self.clean_instance(self.cleaned_data)


class ComponentDiscoverForm(ComponentInitCreateForm):
    discovery = forms.ChoiceField(
        label=_("Choose translation files to import"),
        choices=[("manual", _("Specify configuration manually"))],
        required=True,
        widget=forms.RadioSelect,
    )

    def render_choice(self, value):
        context = copy.copy(value)
        try:
            format_cls = FILE_FORMATS[value["file_format"]]
            context["file_format_name"] = format_cls.name
            context["valid"] = True
        except KeyError:
            context["file_format_name"] = value["file_format"]
            context["valid"] = False
        context["origin"] = value.meta["origin"]
        return render_to_string("trans/discover-choice.html", context)

    def __init__(self, request, *args, **kwargs):
        super().__init__(request, *args, **kwargs)
        for field, value in self.fields.items():
            if field == "discovery":
                continue
            value.widget = forms.HiddenInput()
        # Allow all VCS now (to handle zip file upload case)
        self.fields["vcs"].choices = VCS_REGISTRY.get_choices()
        self.discovered = self.perform_discovery(request, kwargs)
        for i, value in enumerate(self.discovered):
            self.fields["discovery"].choices.append((i, self.render_choice(value)))

    def perform_discovery(self, request, kwargs):
        if "data" in kwargs:
            discovered = []
            for i, data in enumerate(request.session["create_discovery"]):
                item = DiscoveryResult(data)
                item.meta = request.session["create_discovery_meta"][i]
                discovered.append(item)
            return discovered
        self.clean_instance(kwargs["initial"])
        discovered = discover(self.instance.full_path)
        request.session["create_discovery"] = discovered
        request.session["create_discovery_meta"] = [x.meta for x in discovered]
        return discovered

    def clean(self):
        super().clean()
        discovery = self.cleaned_data.get("discovery")
        if discovery and discovery != "manual":
            self.cleaned_data.update(self.discovered[int(discovery)])


class ComponentRenameForm(SettingsBaseForm):
    """Component rename form."""

    class Meta:
        model = Component
        fields = ["slug"]


class ComponentMoveForm(SettingsBaseForm):
    """Component rename form."""

    class Meta:
        model = Component
        fields = ["project"]

    def __init__(self, request, *args, **kwargs):
        super().__init__(request, *args, **kwargs)
        self.fields["project"].queryset = request.user.owned_projects


class ProjectSettingsForm(SettingsBaseForm, ProjectDocsMixin):
    """Project settings form."""

    class Meta:
        model = Project
        fields = (
            "name",
            "web",
            "mail",
            "instructions",
            "set_language_team",
            "use_shared_tm",
            "contribute_shared_tm",
            "enable_hooks",
            "source_language",
            "access_control",
            "translation_review",
            "source_review",
        )
        widgets = {"access_control": forms.RadioSelect()}

    def clean(self):
        data = self.cleaned_data
        if settings.OFFER_HOSTING:
            data["contribute_shared_tm"] = data["use_shared_tm"]
        if (
            "access_control" not in data
            or data["access_control"] is None
            or data["access_control"] == ""
        ):
            data["access_control"] = self.instance.access_control
        access = data["access_control"]

        self.changed_access = access != self.instance.access_control

        if self.changed_access and not self.user_can_change_access:
            raise ValidationError(
                {
                    "access_control": _(
                        "You do not have permission to change project access control."
                    )
                }
            )
        if self.changed_access and access in (
            Project.ACCESS_PUBLIC,
            Project.ACCESS_PROTECTED,
        ):
            unlicensed = self.instance.component_set.filter(license="")
            if unlicensed:
                raise ValidationError(
                    {
                        "access_control": _(
                            "You must specify a license for these components "
                            "to make them publicly accessible: %s"
                        )
                        % ", ".join(unlicensed.values_list("name", flat=True))
                    }
                )

    def save(self):
        super().save()
        if self.changed_access:
            Change.objects.create(
                project=self.instance,
                action=Change.ACTION_ACCESS_EDIT,
                user=self.user,
                details={"access_control": self.instance.access_control},
            )

    def __init__(self, request, *args, **kwargs):
        super().__init__(request, *args, **kwargs)
        self.user = request.user
        self.user_can_change_access = request.user.has_perm(
            "billing:project.permissions", self.instance
        )
        self.changed_access = False
        self.helper.form_tag = False
        if not self.user_can_change_access:
            disabled = {"disabled": True}
            self.fields["access_control"].required = False
            self.fields["access_control"].help_text = _(
                "You do not have permission to change project access control."
            )
        else:
            disabled = {}
        self.helper.layout = Layout(
            TabHolder(
                Tab(_("Basic"), "name", "web", "mail", "instructions", css_id="basic"),
                Tab(
                    _("Access"),
                    InlineRadios(
                        "access_control",
                        template="%s/layout/radioselect_access.html",
                        **disabled
                    ),
                    css_id="access",
                ),
                Tab(
                    _("Workflow"),
                    "set_language_team",
                    "use_shared_tm",
                    "contribute_shared_tm",
                    "enable_hooks",
                    "source_language",
                    "translation_review",
                    "source_review",
                    css_id="workflow",
                ),
                Tab(
                    _("Components"),
                    ContextDiv(
                        template="snippets/project-component-settings.html",
                        context={"object": self.instance, "user": request.user},
                    ),
                    css_id="components",
                ),
                template="layout/pills.html",
            )
        )

        if settings.OFFER_HOSTING:
            self.fields["contribute_shared_tm"].widget = forms.HiddenInput()
            self.fields["use_shared_tm"].help_text = _(
                "Uses and contributes to the pool of shared translations "
                "between projects."
            )


class ProjectRenameForm(SettingsBaseForm):
    """Project rename form."""

    class Meta:
        model = Project
        fields = ["slug"]


class ProjectCreateForm(SettingsBaseForm, ProjectDocsMixin):
    """Project creation form."""

    # This is fake field with is either hidden or configured
    # in the view
    billing = forms.ModelChoiceField(
        label=_("Billing"),
        queryset=User.objects.none(),
        required=True,
        empty_label=None,
    )

    class Meta:
        model = Project
        fields = ("name", "slug", "web", "mail", "instructions")


class ReplaceForm(forms.Form):
    search = forms.CharField(
        label=_("Search string"), min_length=1, required=True, strip=False
    )
    replacement = forms.CharField(
        label=_("Replacement string"), min_length=1, required=True, strip=False
    )

    def __init__(self, *args, **kwargs):
        kwargs["auto_id"] = "id_replace_%s"
        super().__init__(*args, **kwargs)


class ReplaceConfirmForm(forms.Form):
    units = forms.ModelMultipleChoiceField(queryset=Unit.objects.none(), required=False)
    confirm = forms.BooleanField(required=True, initial=True, widget=forms.HiddenInput)

    def __init__(self, units, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields["units"].queryset = units


class MatrixLanguageForm(forms.Form):
    """Form for requesting new language."""

    lang = forms.MultipleChoiceField(
        label=_("Languages"), choices=[], widget=SortedSelectMultiple
    )

    def __init__(self, component, *args, **kwargs):
        super().__init__(*args, **kwargs)
        languages = Language.objects.filter(translation__component=component)
        self.fields["lang"].choices = sort_choices(
            [(l.code, "{0} ({1})".format(force_str(l), l.code)) for l in languages]
        )


class NewUnitForm(forms.Form):
    key = forms.CharField(
        label=_("Translation key"),
        help_text=_(
            "Key used to identify string in translation file. "
            "File format specific rules might apply."
        ),
        required=True,
    )
    value = PluralField(
        label=_("Source language text"),
        help_text=_(
            "You can edit this later, as with any other string in "
            "the source language."
        ),
        required=True,
    )

    def __init__(self, user, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields["value"].widget.attrs["tabindex"] = kwargs.pop("tabindex", 100)
        self.fields["value"].widget.profile = user.profile


class BulkEditForm(forms.Form):
    q = QueryField(required=True)
    state = forms.ChoiceField(
        label=_("State to set"), choices=((-1, _("Do not change")),) + STATE_CHOICES
    )
    add_flags = FlagField(label=_("Translation flags to add"), required=False)
    remove_flags = FlagField(label=_("Translation flags to remove"), required=False)
    add_labels = forms.ModelMultipleChoiceField(
        queryset=Label.objects.none(),
        label=_("Labels to add"),
        widget=forms.CheckboxSelectMultiple(),
        required=False,
    )
    remove_labels = forms.ModelMultipleChoiceField(
        queryset=Label.objects.none(),
        label=_("Labels to remove"),
        widget=forms.CheckboxSelectMultiple(),
        required=False,
    )

    def __init__(self, user, obj, *args, **kwargs):
        project = kwargs.pop("project")
        super().__init__(*args, **kwargs)
        self.fields["remove_labels"].queryset = project.label_set.all()
        self.fields["add_labels"].queryset = project.label_set.all()

        excluded = {STATE_EMPTY, STATE_READONLY}
        if user is not None and not user.has_perm("unit.review", obj):
            excluded.add(STATE_APPROVED)

        # Filter offered states
        self.fields["state"].choices = [
            x for x in self.fields["state"].choices if x[0] not in excluded
        ]


class ContributorAgreementForm(forms.Form):
    confirm = forms.BooleanField(
        label=_("I accept the contributor agreement"), required=True
    )
    next = forms.CharField(required=False, widget=forms.HiddenInput)


class DeleteForm(forms.Form):
    confirm = forms.CharField(
        label=_("Name of the translation"),
        help_text=_("Please type in the full name of the translation to confirm."),
        required=True,
    )

    def __init__(self, obj, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.obj = obj
        self.helper = FormHelper(self)
        message = _(
            "This action cannot be undone. This will permanently delete "
            "the {} translation and all related content."
        ).format("<strong>{}</strong>".format(escape(obj.full_slug)))
        self.helper.layout = Layout(
            Div(HTML(message), css_class="form-group"), Field("confirm")
        )
        self.helper.form_tag = False

    def clean(self):
        if self.cleaned_data.get("confirm") != self.obj.full_slug:
            raise ValidationError(
                _("The translation name does not match the one marked for deletion!")
            )


class AnnouncementForm(forms.ModelForm):
    """Component base form."""

    class Meta:
        model = Announcement
        fields = ["message", "category", "expiry"]
        widgets = {"expiry": WeblateDateInput()}


class ChangesForm(forms.Form):
    project = forms.ChoiceField(label=_("Project"), choices=[("", "")], required=False)
    lang = forms.ChoiceField(label=_("Language"), choices=[("", "")], required=False)
    action = forms.MultipleChoiceField(
        label=_("Action"),
        required=False,
        widget=SortedSelectMultiple,
        choices=Change.ACTION_CHOICES,
    )

    def __init__(self, request, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields["lang"].choices += [
            (l.code, force_str(l)) for l in Language.objects.have_translation()
        ]
        self.fields["project"].choices += [
            (p.slug, p.name) for p in request.user.allowed_projects
        ]


class LabelForm(forms.ModelForm):
    class Meta:
        model = Label
        fields = ("name", "color")
        widgets = {"color": forms.RadioSelect()}

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper(self)
        self.helper.form_tag = False
