# -*- coding: utf8 -*-
# Copyright (c) 2019 Niklas Rosenstein
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.

"""
Pydoc-markdown is an extensible framework for generating API documentation,
with a focus on Python source code and the Markdown output format.
"""

import dataclasses
import logging
import os
import subprocess
import typing as t
from pathlib import Path

import databind.core.annotations as A
import databind.json
import docspec
import tomli

from pydoc_markdown.contrib.loaders.python import PythonLoader
from pydoc_markdown.contrib.processors.crossref import CrossrefProcessor
from pydoc_markdown.contrib.processors.filter import FilterProcessor
from pydoc_markdown.contrib.processors.smart import SmartProcessor
from pydoc_markdown.contrib.renderers.markdown import MarkdownRenderer
from pydoc_markdown.interfaces import Builder, Context, Loader, Processor, Renderer, Resolver
from pydoc_markdown.util import ytemplate

__author__ = "Niklas Rosenstein <rosensteinniklas@gmail.com>"
__version__ = "4.6.5"

logger = logging.getLogger(__name__)


@dataclasses.dataclass
class Hooks:
    pre_render: t.List[str] = dataclasses.field(default_factory=list, metadata={"alias": "pre-render"})
    post_render: t.List[str] = dataclasses.field(default_factory=list, metadata={"alias": "post-render"})


@dataclasses.dataclass
class PydocMarkdown:
    """
    This object represents the main configuration for Pydoc-Markdown.
    """

    #: A list of loader implementations that load #docspec.Module#s.
    #: Defaults to #PythonLoader.
    loaders: t.List[Loader] = dataclasses.field(default_factory=lambda: [PythonLoader()])

    #: A list of processor implementations that modify #docspec.Module#s. Defaults
    #: to #FilterProcessor, #SmartProcessor and #CrossrefProcessor.
    processors: t.List[Processor] = dataclasses.field(
        default_factory=lambda: [FilterProcessor(), SmartProcessor(), CrossrefProcessor()]
    )

    #: A renderer for #docspec.Module#s. Defaults to #MarkdownRenderer.
    renderer: Renderer = dataclasses.field(default_factory=MarkdownRenderer)

    #: Hooks that can be executed at certain points in the pipeline. The commands
    #: are executed with the current `SHELL`.
    hooks: Hooks = dataclasses.field(default_factory=Hooks)

    # Hidden fields are filled at a later point in time and are not (de-) serialized.
    unknown_fields: t.List[str] = dataclasses.field(default_factory=list)

    def __post_init__(self) -> None:
        self.resolver: t.Optional[Resolver] = None
        self._context: t.Optional[Context] = None

    def load_config(self, arg: t.Union[str, dict]) -> None:
        """
        Loads the configuration from a nested data structure or filename as specified per the *data*
        argument. If a filename is specified, it may be a JSON, YAML or TOML file. If the name of the
        TOML file is `pyproject.yoml`, the configuration will be read from the `[tool.pydoc-markdown]`
        section.

        :param data: A nested structure or the path to a configuration file.
        """

        filename = None
        if isinstance(arg, str):
            filename = arg
            logger.info('Loading configuration file "%s".', filename)
            if filename.endswith(".toml"):
                data = tomli.loads(Path(filename).read_text())
            else:
                data = ytemplate.load(filename, {"env": ytemplate.Attributor(os.environ)})
            if filename == "pyproject.toml":
                data = data["tool"]["pydoc-markdown"]
        else:
            data = arg

        unknown_keys = A.collect_unknowns()
        result = databind.json.new_mapper().deserialize(data, type(self), filename=filename, settings=[unknown_keys()])  # type: ignore[arg-type]  # noqa: E501  # Bad databind typehint
        vars(self).update(vars(result))

        for loc, keys in unknown_keys:
            for key in keys:
                self.unknown_fields.append(str(loc.push_unknown(key).format()))

    def init(self, context: Context) -> None:
        """
        Initialize all plugins with the specified *context*. Cannot be called multiple times.
        If omitted, the plugins will be initialized with a default context before the load,
        process or render phase.
        """

        if self._context:
            raise RuntimeError("already initialized")
        self._context = context
        logger.debug("Initializing plugins with context %r", context)
        for loader in self.loaders:
            loader.init(context)
        for processor in self.processors:
            processor.init(context)
        self.renderer.init(context)

    def ensure_initialized(self) -> None:
        if not self._context:
            self.init(Context(directory="."))

    def load_modules(self) -> t.List[docspec.Module]:
        """
        Loads modules via the #loaders.
        """

        logger.info("Loading modules.")
        self.ensure_initialized()
        modules: t.List[docspec.Module] = []
        for loader in self.loaders:
            modules.extend(loader.load())
        return modules

    def process(self, modules: t.List[docspec.Module]) -> None:
        """
        Process modules via the #processors.
        """

        self.ensure_initialized()
        if self.resolver is None:
            self.resolver = self.renderer.get_resolver(modules)
        for processor in self.processors:
            processor.process(modules, self.resolver)

    def render(self, modules: t.List[docspec.Module], run_hooks: bool = True) -> None:
        """
        Render modules via the #renderer.
        """

        self.ensure_initialized()
        if run_hooks:
            self.run_hooks("pre-render")
        if self.resolver is None:
            self.resolver = self.renderer.get_resolver(modules)
        self.renderer.process(modules, self.resolver)
        self.renderer.render(modules)
        if run_hooks:
            self.run_hooks("post-render")

    def build(self, site_dir: str) -> None:
        if not isinstance(self.renderer, Builder):
            name = type(self.renderer).__name__
            raise NotImplementedError('Renderer "{}" does not support building'.format(name))
        self.ensure_initialized()
        self.renderer.build(site_dir)

    def run_hooks(self, hook_name: str) -> None:
        assert self._context is not None

        # Remove the __PYVENV_LAUNCHER__ environment variable. This is needed if you are in a virtualenv and the hook
        # tries to invoke a script installed into a _different_ virtualenv. Otherwise, that script's execution of the
        # Python `site` module will set the `sys.prefix` the prefix of your terminal's activated virtualenv. The prefix
        # is then used to find site-packages, and thus none of the site-packages from the script's actual prefix are
        # detected.
        env = os.environ.copy()
        env.pop("__PYVENV_LAUNCHER__", None)

        for command in getattr(self.hooks, hook_name.replace("-", "_")):
            subprocess.check_call(command, shell=True, cwd=self._context.directory, env=env)
