"""Client-centric CWL-related utilities.

Used to share code between the Galaxy test framework
and other Galaxy CWL clients (e.g. Planemo)."""
import hashlib
import json
import os
import tarfile
import tempfile
from collections import namedtuple

import yaml
from six import (
    BytesIO,
    iteritems,
    python_2_unicode_compatible
)

from galaxy.util import unicodify

STORE_SECONDARY_FILES_WITH_BASENAME = True
SECONDARY_FILES_EXTRA_PREFIX = "__secondary_files__"
SECONDARY_FILES_INDEX_PATH = "__secondary_files_index.json"


def set_basename_and_derived_properties(properties, basename):
    properties["basename"] = basename
    properties["nameroot"], properties["nameext"] = os.path.splitext(basename)
    return properties


def output_properties(path=None, content=None, basename=None, pseduo_location=False):
    checksum = hashlib.sha1()
    properties = {
        "class": "File",
    }
    if path is not None:
        properties["path"] = path
        f = open(path, "rb")
    else:
        f = BytesIO(content)

    try:
        contents = f.read(1024 * 1024)
        filesize = 0
        while contents:
            checksum.update(contents)
            filesize += len(contents)
            contents = f.read(1024 * 1024)
    finally:
        f.close()
    properties["checksum"] = "sha1$%s" % checksum.hexdigest()
    properties["size"] = filesize
    set_basename_and_derived_properties(properties, basename)
    _handle_pseudo_location(properties, pseduo_location)
    return properties


def _handle_pseudo_location(properties, pseduo_location):
    if pseduo_location:
        properties["location"] = properties["basename"]


def abs_path_or_uri(path_or_uri, relative_to):
    """Return an absolute path if this isn't a URI, otherwise keep the URI the same.
    """
    is_uri = "://" in path_or_uri
    if not is_uri and not os.path.isabs(path_or_uri):
        path_or_uri = os.path.join(relative_to, path_or_uri)
    if not is_uri:
        _ensure_file_exists(path_or_uri)
    return path_or_uri


def abs_path(path_or_uri, relative_to):
    path_or_uri = abs_path_or_uri(path_or_uri, relative_to)
    if path_or_uri.startswith("file://"):
        path_or_uri = path_or_uri[len("file://"):]

    return path_or_uri


def path_or_uri_to_uri(path_or_uri):
    if "://" not in path_or_uri:
        return "file://%s" % path_or_uri
    else:
        return path_or_uri


def galactic_job_json(
    job, test_data_directory, upload_func, collection_create_func, tool_or_workflow="workflow"
):
    """Adapt a CWL job object to the Galaxy API.

    CWL derived tools in Galaxy can consume a job description sort of like
    CWL job objects via the API but paths need to be replaced with datasets
    and records and arrays with collection references. This function will
    stage files and modify the job description to adapt to these changes
    for Galaxy.
    """

    datasets = []
    dataset_collections = []

    def response_to_hda(target, upload_response):
        assert isinstance(upload_response, dict), upload_response
        assert "outputs" in upload_response, upload_response
        assert len(upload_response["outputs"]) > 0, upload_response
        dataset = upload_response["outputs"][0]
        datasets.append((dataset, target))
        dataset_id = dataset["id"]
        return {"src": "hda", "id": dataset_id}

    def upload_file(file_path, secondary_files, **kwargs):
        file_path = abs_path_or_uri(file_path, test_data_directory)
        target = FileUploadTarget(file_path, secondary_files, **kwargs)
        upload_response = upload_func(target)
        return response_to_hda(target, upload_response)

    def upload_file_literal(contents):
        target = FileLiteralTarget(contents)
        upload_response = upload_func(target)
        return response_to_hda(target, upload_response)

    def upload_tar(file_path):
        file_path = abs_path_or_uri(file_path, test_data_directory)
        target = DirectoryUploadTarget(file_path)
        upload_response = upload_func(target)
        return response_to_hda(target, upload_response)

    def upload_object(the_object):
        target = ObjectUploadTarget(the_object)
        upload_response = upload_func(target)
        return response_to_hda(target, upload_response)

    def replacement_item(value, force_to_file=False):
        is_dict = isinstance(value, dict)
        item_class = None if not is_dict else value.get("class", None)
        is_file = item_class == "File"
        is_directory = item_class == "Directory"
        is_collection = item_class == "Collection"  # Galaxy extension.

        if force_to_file:
            if is_file:
                return replacement_file(value)
            else:
                return upload_object(value)

        if isinstance(value, list):
            return replacement_list(value)
        elif not isinstance(value, dict):
            if tool_or_workflow == "workflow":
                # All inputs represented as dataset or collection parameters
                return upload_object(value)
            else:
                return value

        if is_file:
            return replacement_file(value)
        elif is_directory:
            return replacement_directory(value)
        elif is_collection:
            return replacement_collection(value)
        else:
            return replacement_record(value)

    def replacement_file(value):
        file_path = value.get("location", None) or value.get("path", None)
        if file_path is None:
            contents = value.get("contents", None)
            if contents is not None:
                return upload_file_literal(contents)

            return value

        filetype = value.get('filetype', None)
        secondary_files = value.get("secondaryFiles", [])
        secondary_files_tar_path = None
        if secondary_files:
            tmp = tempfile.NamedTemporaryFile(delete=False)
            tf = tarfile.open(fileobj=tmp, mode='w:')
            order = []
            index_contents = {
                "order": order
            }
            for secondary_file in secondary_files:
                secondary_file_path = secondary_file.get("location", None) or secondary_file.get("path", None)
                assert secondary_file_path, "Invalid secondaryFile entry found [%s]" % secondary_file
                full_secondary_file_path = os.path.join(test_data_directory, secondary_file_path)
                basename = secondary_file.get("basename") or os.path.basename(secondary_file_path)
                order.append(unicodify(basename))
                tf.add(full_secondary_file_path, os.path.join(SECONDARY_FILES_EXTRA_PREFIX, basename))
            tmp_index = tempfile.NamedTemporaryFile(delete=False, mode="w")
            json.dump(index_contents, tmp_index)
            tmp_index.close()
            tf.add(tmp_index.name, SECONDARY_FILES_INDEX_PATH)
            tf.close()
            secondary_files_tar_path = tmp.name

        return upload_file(file_path, secondary_files_tar_path, filetype=filetype)

    def replacement_directory(value):
        file_path = value.get("location", None) or value.get("path", None)
        if file_path is None:
            return value

        if not os.path.isabs(file_path):
            file_path = os.path.join(test_data_directory, file_path)

        tmp = tempfile.NamedTemporaryFile(delete=False)
        tf = tarfile.open(fileobj=tmp, mode='w:')
        tf.add(file_path, '.')
        tf.close()

        return upload_tar(tmp.name)

    def replacement_list(value):
        collection_element_identifiers = []
        for i, item in enumerate(value):
            dataset = replacement_item(item, force_to_file=True)
            collection_element = dataset.copy()
            collection_element["name"] = str(i)
            collection_element_identifiers.append(collection_element)

        # TODO: handle nested lists/arrays
        collection = collection_create_func(collection_element_identifiers, "list")
        dataset_collections.append(collection)
        hdca_id = collection["id"]
        return {"src": "hdca", "id": hdca_id}

    def replacement_collection(value):
        collection_element_identifiers = []
        assert "collection_type" in value
        assert "elements" in value

        collection_type = value["collection_type"]
        elements = value["elements"]

        for element in elements:
            dataset = replacement_item(element, force_to_file=True)
            collection_element = dataset.copy()
            collection_element["name"] = element["identifier"]
            collection_element_identifiers.append(collection_element)

        # TODO: handle nested lists/arrays
        collection = collection_create_func(collection_element_identifiers, collection_type)
        dataset_collections.append(collection)
        hdca_id = collection["id"]
        return {"src": "hdca", "id": hdca_id}

    def replacement_record(value):
        collection_element_identifiers = []
        for record_key, record_value in value.items():
            if not isinstance(record_value, dict) or record_value.get("class") != "File":
                dataset = replacement_item(record_value, force_to_file=True)
                collection_element = dataset.copy()
            else:
                dataset = upload_file(record_value["location"], [])
                collection_element = dataset.copy()

            collection_element["name"] = record_key
            collection_element_identifiers.append(collection_element)

        collection = collection_create_func(collection_element_identifiers, "record")
        dataset_collections.append(collection)
        hdca_id = collection["id"]
        return {"src": "hdca", "id": hdca_id}

    replace_keys = {}
    for key, value in iteritems(job):
        replace_keys[key] = replacement_item(value)

    job.update(replace_keys)
    return job, datasets


def _ensure_file_exists(file_path):
    if not os.path.exists(file_path):
        template = "File [%s] does not exist - parent directory [%s] does %sexist, cwd is [%s]"
        parent_directory = os.path.dirname(file_path)
        message = template % (
            file_path,
            parent_directory,
            "" if os.path.exists(parent_directory) else "not ",
            os.getcwd(),
        )
        raise Exception(message)


@python_2_unicode_compatible
class FileLiteralTarget(object):

    def __init__(self, contents, **kwargs):
        self.contents = contents

    def __str__(self):
        return "FileLiteralTarget[path=%s] with %s" % (self.path, self.properties)


@python_2_unicode_compatible
class FileUploadTarget(object):

    def __init__(self, path, secondary_files=None, **kwargs):
        self.path = path
        self.secondary_files = secondary_files
        self.properties = kwargs

    def __str__(self):
        return "FileUploadTarget[path=%s] with %s" % (self.path, self.properties)


@python_2_unicode_compatible
class ObjectUploadTarget(object):

    def __init__(self, the_object):
        self.object = the_object

    def __str__(self):
        return "ObjectUploadTarget[object=%s]" % self.object


@python_2_unicode_compatible
class DirectoryUploadTarget(object):

    def __init__(self, tar_path):
        self.tar_path = tar_path

    def __str__(self):
        return "DirectoryUploadTarget[tar_path=%s]" % self.tar_path


GalaxyOutput = namedtuple("GalaxyOutput", ["history_id", "history_content_type", "history_content_id"])


def tool_response_to_output(tool_response, history_id, output_id):
    for output in tool_response["outputs"]:
        if output["output_name"] == output_id:
            return GalaxyOutput(history_id, "dataset", output["id"])

    for output_collection in tool_response["output_collections"]:
        if output_collection["output_name"] == output_id:
            return GalaxyOutput(history_id, "dataset_collection", output_collection["id"])

    raise Exception("Failed to find output with label [%s]" % output_id)


def invocation_to_output(invocation, history_id, output_id):
    if output_id in invocation["outputs"]:
        dataset = invocation["outputs"][output_id]
        galaxy_output = GalaxyOutput(history_id, "dataset", dataset["id"])
    elif output_id in invocation["output_collections"]:
        collection = invocation["output_collections"][output_id]
        galaxy_output = GalaxyOutput(history_id, "dataset_collection", collection["id"])
    else:
        raise Exception("Failed to find output with label [%s] in [%s]" % (output_id, invocation))

    return galaxy_output


def output_to_cwl_json(
    galaxy_output, get_metadata, get_dataset, get_extra_files, pseduo_location=False,
):
    """Convert objects in a Galaxy history into a CWL object.

    Useful in running conformance tests and implementing the cwl-runner
    interface via Galaxy.
    """
    def element_to_cwl_json(element):
        element_output = GalaxyOutput(
            galaxy_output.history_id,
            element["object"]["history_content_type"],
            element["object"]["id"],
        )
        return output_to_cwl_json(element_output, get_metadata, get_dataset, get_extra_files, pseduo_location=pseduo_location)

    output_metadata = get_metadata(galaxy_output.history_content_type, galaxy_output.history_content_id)

    def dataset_dict_to_json_content(dataset_dict):
        if "content" in dataset_dict:
            return json.loads(dataset_dict["content"])
        else:
            with open(dataset_dict["path"]) as f:
                return json.safe_load(f)

    if output_metadata["history_content_type"] == "dataset":
        ext = output_metadata["file_ext"]
        assert output_metadata["state"] == "ok"
        if ext == "expression.json":
            dataset_dict = get_dataset(output_metadata)
            return dataset_dict_to_json_content(dataset_dict)
        else:
            file_or_directory = "Directory" if ext == "directory" else "File"
            secondary_files = []

            if file_or_directory == "File":
                dataset_dict = get_dataset(output_metadata)
                properties = output_properties(pseduo_location=pseduo_location, **dataset_dict)
                basename = properties["basename"]
                extra_files = get_extra_files(output_metadata)
                found_index = False
                for extra_file in extra_files:
                    if extra_file["class"] == "File":
                        path = extra_file["path"]
                        if path == SECONDARY_FILES_INDEX_PATH:
                            found_index = True

                if found_index:
                    ec = get_dataset(output_metadata, filename=SECONDARY_FILES_INDEX_PATH)
                    index = dataset_dict_to_json_content(ec)

                    def dir_listing(dir_path):
                        listing = []
                        for extra_file in extra_files:
                            path = extra_file["path"]
                            extra_file_class = extra_file["class"]
                            extra_file_basename = os.path.basename(path)
                            if os.path.join(dir_path, extra_file_basename) != path:
                                continue

                            if extra_file_class == "File":
                                ec = get_dataset(output_metadata, filename=path)
                                ec["basename"] = extra_file_basename
                                ec_properties = output_properties(pseduo_location=pseduo_location, **ec)
                            elif extra_file_class == "Directory":
                                ec_properties = {}
                                ec_properties["class"] = "Directory"
                                ec_properties["location"] = ec_basename
                                ec_properties["listing"] = dir_listing(path)
                            else:
                                raise Exception("Unknown output type encountered....")
                            listing.append(ec_properties)
                        return listing

                    for basename in index["order"]:
                        for extra_file in extra_files:
                            path = extra_file["path"]
                            if path != os.path.join(SECONDARY_FILES_EXTRA_PREFIX, basename):
                                continue

                            extra_file_class = extra_file["class"]

                            # This is wrong...
                            if not STORE_SECONDARY_FILES_WITH_BASENAME:
                                ec_basename = basename + os.path.basename(path)
                            else:
                                ec_basename = os.path.basename(path)

                            if extra_file_class == "File":
                                ec = get_dataset(output_metadata, filename=path)
                                ec["basename"] = ec_basename
                                ec_properties = output_properties(pseduo_location=pseduo_location, **ec)
                            elif extra_file_class == "Directory":
                                ec_properties = {}
                                ec_properties["class"] = "Directory"
                                ec_properties["location"] = ec_basename
                                ec_properties["listing"] = dir_listing(path)
                            else:
                                raise Exception("Unknown output type encountered....")
                            secondary_files.append(ec_properties)

            else:
                basename = output_metadata.get("created_from_basename")
                if not basename:
                    basename = output_metadata.get("name")

                listing = []
                properties = {
                    "class": "Directory",
                    "basename": basename,
                    "listing": listing,
                }

                extra_files = get_extra_files(output_metadata)
                for extra_file in extra_files:
                    if extra_file["class"] == "File":
                        path = extra_file["path"]
                        ec = get_dataset(output_metadata, filename=path)
                        ec["basename"] = os.path.basename(path)
                        ec_properties = output_properties(pseduo_location=pseduo_location, **ec)
                        listing.append(ec_properties)

            if secondary_files:
                properties["secondaryFiles"] = secondary_files
            return properties

    elif output_metadata["history_content_type"] == "dataset_collection":
        if output_metadata["collection_type"] == "list":
            rval = []
            for element in output_metadata["elements"]:
                rval.append(element_to_cwl_json(element))
        elif output_metadata["collection_type"] == "record":
            rval = {}
            for element in output_metadata["elements"]:
                rval[element["element_identifier"]] = element_to_cwl_json(element)
        return rval
    else:
        raise NotImplementedError("Unknown history content type encountered")


def download_output(galaxy_output, get_metadata, get_dataset, get_extra_files, output_path):
    output_metadata = get_metadata(galaxy_output.history_content_type, galaxy_output.history_content_id)
    dataset_dict = get_dataset(output_metadata)
    with open(output_path, 'wb') as fh:
        fh.write(dataset_dict['content'])


def guess_artifact_type(path):
    # TODO: Handle IDs within files.
    tool_or_workflow = "workflow"
    try:
        with open(path, "r") as f:
            artifact = yaml.safe_load(f)

        tool_or_workflow = "tool" if artifact["class"] != "Workflow" else "workflow"

    except Exception as e:
        print(e)

    return tool_or_workflow
