from __future__ import annotations

import importlib
import re
from pathlib import Path
from typing import Any, Optional

import requests
import tomlkit as toml
from typer import Argument, Option
from typing_extensions import Annotated

from gradio.analytics import custom_component_analytics
from gradio.cli.commands.display import LivePanelDisplay

from ._docs_assets import css
from ._docs_utils import extract_docstrings, get_deep, make_markdown, make_space


def _docs(
    path: Annotated[
        Path, Argument(help="The directory of the custom component.")
    ] = Path("."),
    demo_dir: Annotated[
        Optional[Path], Option(help="Path to the demo directory.")
    ] = None,
    demo_name: Annotated[Optional[str], Option(help="Name of the demo file.")] = None,
    readme_path: Annotated[
        Optional[Path], Option(help="Path to the README.md file.")
    ] = None,
    space_url: Annotated[
        Optional[str], Option(help="URL of the Space to use for the demo.")
    ] = None,
    generate_space: Annotated[
        bool,
        Option(
            help="Create a documentation space for the custom compone.", is_flag=True
        ),
    ] = True,
    generate_readme: Annotated[
        bool,
        Option(help="Create a README.md file for the custom component.", is_flag=True),
    ] = True,
    suppress_demo_check: Annotated[
        bool,
        Option(
            help="Suppress demo warnings and errors.",
            is_flag=True,
        ),
    ] = False,
):
    """Runs the documentation generator."""
    custom_component_analytics(
        "docs",
        None,
        None,
        None,
        None,
    )

    _component_dir = Path(path).resolve()
    _demo_dir = Path(demo_dir).resolve() if demo_dir else Path("demo").resolve()
    _demo_name = demo_name if demo_name else "app.py"
    _demo_path = _demo_dir / _demo_name
    _readme_path = (
        Path(readme_path).resolve() if readme_path else _component_dir / "README.md"
    )

    if not generate_space and not generate_readme:
        raise ValueError("Must generate at least one of space or readme")

    with LivePanelDisplay() as live:
        live.update(
            f":page_facing_up: Generating documentation for [orange3]{str(_component_dir.name)}[/]",
            add_sleep=0.2,
        )
        live.update(
            f":eyes: Reading project metadata from [orange3]{_component_dir}/pyproject.toml[/]\n"
        )

        if not (_component_dir / "pyproject.toml").exists():
            raise ValueError(
                f"Cannot find pyproject.toml file in [orange3]{_component_dir}[/]"
            )

        with open(_component_dir / "pyproject.toml", encoding="utf-8") as f:
            data = toml.loads(f.read())

        name = get_deep(data, ["project", "name"])

        if not isinstance(name, str):
            raise ValueError("Name not found in pyproject.toml")

        run_command(
            live=live,
            name=name,
            suppress_demo_check=suppress_demo_check,
            pyproject_toml=data,
            generate_space=generate_space,
            generate_readme=generate_readme,
            type_mode="simple",
            _demo_path=_demo_path,
            _demo_dir=_demo_dir,
            _readme_path=_readme_path,
            space_url=space_url,
            _component_dir=_component_dir,
        )


def run_command(
    live: LivePanelDisplay,
    name: str,
    pyproject_toml: dict[str, Any],
    suppress_demo_check: bool,
    generate_space: bool,
    generate_readme: bool,
    type_mode: str,
    _demo_path: Path,
    _demo_dir: Path,
    _readme_path: Path,
    space_url: str | None,
    _component_dir: Path,
    simple: bool = False,
):
    with open(_demo_path, encoding="utf-8") as f:
        demo = f.read()

    pypi_exists = requests.get(f"https://pypi.org/pypi/{name}/json").status_code

    pypi_exists = pypi_exists == 200 or False

    local_version = get_deep(pyproject_toml, ["project", "version"])
    description = str(get_deep(pyproject_toml, ["project", "description"]) or "")
    repo = get_deep(pyproject_toml, ["project", "urls", "repository"])
    space = (
        space_url
        if space_url
        else get_deep(pyproject_toml, ["project", "urls", "space"])
    )

    if not local_version and not pypi_exists:
        raise ValueError(
            f"Cannot find version in pyproject.toml or on PyPI for [orange3]{name}[/].\nIf you have just published to PyPI, please wait a few minutes and try again."
        )
    module = importlib.import_module(name)
    (docs, type_mode) = extract_docstrings(module)

    if generate_space:
        if not simple:
            live.update(":computer: [blue]Generating space.[/]")

        source = make_space(
            docs=docs,
            name=name,
            description=description,
            local_version=local_version
            if local_version is None
            else str(local_version),
            demo=demo,
            space=space if space is None else str(space),
            repo=repo if repo is None else str(repo),
            pypi_exists=pypi_exists,
            suppress_demo_check=suppress_demo_check,
        )

        with open(_demo_dir / "space.py", "w", encoding="utf-8") as f:
            f.write(source)
            if not simple:
                live.update(
                    f":white_check_mark: Space created in [orange3]{_demo_dir}/space.py[/]\n"
                )
        with open(_demo_dir / "css.css", "w", encoding="utf-8") as f:
            f.write(css)

    if generate_readme:
        if not simple:
            live.update(":pencil: [blue]Generating README.[/]")
        readme = make_markdown(
            docs, name, description, local_version, demo, space, repo, pypi_exists
        )

        readme_content = Path(_readme_path).read_text()

        with open(_readme_path, "w", encoding="utf-8") as f:
            yaml_regex = re.search(
                "(?:^|[\r\n])---[\n\r]+([\\S\\s]*?)[\n\r]+---([\n\r]|$)", readme_content
            )
            if yaml_regex is not None:
                readme = readme_content[: yaml_regex.span()[-1]] + readme
            f.write(readme)
            if not simple:
                live.update(
                    f":white_check_mark: README generated in [orange3]{_readme_path}[/]"
                )
    if simple:
        short_readme_path = Path(_readme_path).relative_to(_component_dir)
        short_demo_path = Path(_demo_dir / "space.py").relative_to(_component_dir)
        live.update(
            f":white_check_mark: Documentation generated in [orange3]{short_demo_path}[/] and [orange3]{short_readme_path}[/]. Pass --no-generate-docs to disable auto documentation."
        )

    if type_mode == "simple":
        live.update(
            "\n:orange_circle: [red]The docs were generated in simple mode. Updating python to a version greater than 3.9 will result in richer documentation.[/]"
        )