"""
# Summary

Command definitions for the doc-forge CLI.

Provides the CLI structure using Click, including build, serve, and tree commands.

---

Notes:
    - The `build` command validates requested modes before generating anything.
    - `--mkdocs`, `--api`, and `--wiki` share a single MkDocs build; `--mcp`
      generates a machine-readable bundle independently.

---
"""

from pathlib import Path

import click

from docforge.cli import api_utils, mcp_utils, mkdocs_utils
from docforge.loaders import GriffeLoader
from docforge.models import DocObject


@click.group()
def cli() -> None:
    """
    Root command group for the doc-forge CLI.

    Provides commands for building, serving, and inspecting
    documentation generated from Python source code.
    """
    pass


@cli.command()
@click.option("--mcp", is_flag=True, help="Build MCP resources")
@click.option("--mkdocs", is_flag=True, help="Build MkDocs site")
@click.option("--api", is_flag=True, help="Build API docs from an OpenAPI spec")
@click.option(
    "--wiki", is_flag=True, help="Include a hand-written wiki in the MkDocs site"
)
@click.option(
    "--module-is-source",
    is_flag=True,
    help="Module is source folder and to be treated as root folder",
)
@click.option("--module", help="Python module to document")
@click.option(
    "--openapi-spec",
    type=click.Path(path_type=Path),
    help="Path to the OpenAPI JSON specification",
)
@click.option("--project-name", help="Project name override")
@click.option("--site-name", help="MkDocs site name")
@click.option(
    "--docs-dir",
    type=click.Path(path_type=Path),
    default=Path("docs"),
    help="MkDocs documentation root",
)
@click.option(
    "--wiki-dir",
    type=click.Path(path_type=Path),
    default=Path("docs/wiki"),
    help="Hand-written wiki directory included in the MkDocs site",
)
@click.option(
    "--nav",
    "nav_file",
    type=click.Path(path_type=Path),
    default=Path("docforge.nav.yml"),
    help="Nav spec path",
)
@click.option(
    "--template", type=click.Path(path_type=Path), help="MkDocs template path"
)
@click.option(
    "--mkdocs-yml",
    type=click.Path(path_type=Path),
    default=Path("mkdocs.yml"),
    help="Output config path",
)
@click.option(
    "--out-dir",
    type=click.Path(path_type=Path),
    default=Path("docs/mcp"),
    help="MCP output directory",
)
def build(
    mcp: bool,
    mkdocs: bool,
    api: bool,
    wiki: bool,
    module_is_source: bool,
    module: str | None,
    openapi_spec: Path | None,
    project_name: str | None,
    site_name: str | None,
    docs_dir: Path,
    wiki_dir: Path,
    nav_file: Path,
    template: Path | None,
    mkdocs_yml: Path,
    out_dir: Path,
) -> None:
    """
    Build documentation artifacts.

    This command runs the full documentation pipeline: it loads Python
    modules, generates renderer-specific documentation sources, and
    optionally builds or serves the final output.

    Depending on the selected options, the build can target:

    - MkDocs static documentation sites for library reference docs
    - Swagger-enabled API docs generated from an OpenAPI spec
    - Hand-written wiki pages included in the MkDocs site
    - MCP structured documentation resources

    Notes:
        - At least one of `--mcp`, `--mkdocs`, `--wiki`, or `--api` must be
          provided.
        - `--mkdocs`, `--api`, and `--wiki` are combined into a single MkDocs
          build, while `--mcp` emits a machine-readable bundle.

    Args:
        mcp (bool):
            Enable MCP documentation generation.

        mkdocs (bool):
            Enable MkDocs library documentation generation.

        api (bool):
            Enable API documentation generation from an OpenAPI spec.

        wiki (bool):
            Include a hand-written wiki directory in the MkDocs site.

        module_is_source (bool):
            Treat the specified module directory as the project root.

        module (str | None):
            Python module import path to document.

        openapi_spec (Path | None):
            Path to the OpenAPI JSON specification used for API docs.

        project_name (str | None):
            Optional override for the project name.

        site_name (str | None):
            Display name for the MkDocs site.

        docs_dir (Path):
            Shared documentation root used as the MkDocs ``docs_dir``.

        wiki_dir (Path):
            Directory containing hand-written wiki markdown files.

        nav_file (Path):
            Path to the navigation specification file.

        template (Path | None):
            Optional custom MkDocs configuration template.

        mkdocs_yml (Path):
            Output path for the generated MkDocs configuration.

        out_dir (Path):
            Output directory for generated MCP resources.

    Raises:
        click.UsageError:
            If required options are missing or conflicting.
    """
    if not mcp and not mkdocs and not api and not wiki:
        raise click.UsageError("Must specify either --mcp, --mkdocs, --wiki, or --api")

    if api:
        if not openapi_spec:
            raise click.UsageError("--openapi-spec is required for API build")
        if site_name and not mkdocs and not wiki:
            raise click.UsageError(
                "--site-name cannot be overridden for API build; "
                "the OpenAPI spec provides the site name"
            )

    if (mkdocs or mcp) and not module:
        raise click.UsageError(
            "--module is required for MkDocs build"
            if mkdocs
            else "--module is required for MCP build"
        )

    spec: dict | None = None
    if api:
        spec = api_utils.load_openapi_spec(openapi_spec)

    if mkdocs:
        lib_dir = docs_dir / "lib"
        click.echo(f"Generating MkDocs sources in {lib_dir}...")
        mkdocs_utils.generate_sources(
            module,
            lib_dir,
            project_name,
            module_is_source,
            readme_dir=mkdocs_yml.parent,
        )

    if api:
        api_dir = docs_dir / "api"
        click.echo(f"Generating API sources in {api_dir}...")
        api_utils.generate_api_sources(spec, api_dir)

    if mkdocs or api or wiki:
        modes: list[str] = []
        if mkdocs:
            modes.append("lib")
        if api:
            modes.append("api")
        if wiki:
            modes.append("wiki")

        site_description: str | None = None
        site_author: str | None = None
        effective_site_name = site_name or module or Path.cwd().name

        if api:
            metadata = api_utils.derive_metadata(spec)
            effective_site_name = metadata.site_name
            site_description = metadata.site_description
            site_author = metadata.site_author

        click.echo(f"Generating MkDocs config {mkdocs_yml}...")
        mkdocs_utils.generate_config(
            docs_dir,
            nav_file,
            template,
            mkdocs_yml,
            effective_site_name,
            modes=modes,
            site_description=site_description,
            site_author=site_author,
            wiki_dir=wiki_dir if wiki else None,
        )

        click.echo("Running MkDocs build...")
        mkdocs_utils.build(mkdocs_yml)
        click.echo("MkDocs build completed.")

    if mcp:
        if not module:
            raise click.UsageError("--module is required for MCP build")

        click.echo(f"Generating MCP resources in {out_dir}...")
        mcp_utils.generate_resources(module, project_name, out_dir)
        click.echo("MCP build completed.")


@cli.command()
@click.option("--mcp", is_flag=True, help="Serve MCP documentation")
@click.option("--mkdocs", is_flag=True, help="Serve MkDocs site")
@click.option("--module", help="Python module to serve")
@click.option(
    "--mkdocs-yml",
    type=click.Path(path_type=Path),
    default=Path("mkdocs.yml"),
    help="MkDocs config path",
)
@click.option(
    "--out-dir",
    type=click.Path(path_type=Path),
    default=Path("docs/mcp"),
    help="MCP root directory",
)
def serve(
    mcp: bool,
    mkdocs: bool,
    module: str | None,
    mkdocs_yml: Path,
    out_dir: Path,
) -> None:
    """
    Serve generated documentation locally.

    Depending on the selected mode, this command starts either:

    - A MkDocs development server for browsing documentation
    - An MCP server exposing structured documentation resources

    Args:
        mcp (bool):
            Serve documentation using the MCP server.

        mkdocs (bool):
            Serve the MkDocs development site.

        module (str | None):
            Python module import path to serve via MCP.

        mkdocs_yml (Path):
            Path to the MkDocs configuration file.

        out_dir (Path):
            Root directory containing MCP documentation resources.

    Raises:
        click.UsageError:
            If invalid or conflicting options are provided.
    """
    if mcp and mkdocs:
        raise click.UsageError("Cannot specify both --mcp and --mkdocs")
    if not mcp and not mkdocs:
        raise click.UsageError("Must specify either --mcp or --mkdocs")
    if mcp and not module:
        raise click.UsageError("--module is required for MCP serve")

    if mkdocs:
        mkdocs_utils.serve(mkdocs_yml)
    elif mcp:
        mcp_utils.serve(module, out_dir)


@cli.command()
@click.option(
    "--module",
    required=True,
    help="Python module import path to introspect",
)
@click.option(
    "--project-name",
    help="Project name (defaults to specified module)",
)
def tree(
    module: str,
    project_name: str | None,
) -> None:
    """
    Display the documentation object tree for a module.

    This command introspects the specified module and prints a
    hierarchical representation of the discovered documentation
    objects, including modules, classes, functions, and members.

    Args:
        module (str):
            Python module import path to introspect.

        project_name (str | None):
            Optional name to display as the project root.
    """
    loader = GriffeLoader()
    project = loader.load_project([module], project_name)

    click.echo(project.name)

    for module in project.get_all_modules():
        click.echo(f"├── {module.path}")
        for obj in module.get_all_objects():
            _print_object(obj, indent="│   ")


def _print_object(obj: DocObject, indent: str) -> None:
    """
    Recursively print a documentation object and its members.

    This helper function traverses the documentation object graph
    and prints each object with indentation to represent hierarchy.

    Args:
        obj (DocObject):
            Documentation object to print.

        indent (str):
            Current indentation prefix used for nested members.
    """
    click.echo(f"{indent}├── {obj.name}")
    for member in obj.get_all_members():
        _print_object(member, indent + "│   ")