import click
from pathlib import Path
from typing import Sequence, Optional
from docforge.loaders import GriffeLoader
from docforge.cli import mkdocs_utils
from docforge.cli import mcp_utils


@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("--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("--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="Directory for MD sources")
@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("mcp_docs"), help="MCP output directory")
def build(
    mcp: bool,
    mkdocs: bool,
    module_is_source: bool,
    module: Optional[str],
    project_name: Optional[str],
    site_name: Optional[str],
    docs_dir: Path,
    nav_file: Path,
    template: Optional[Path],
    mkdocs_yml: Path,
    out_dir: Path,
) -> None:
    """
    Build documentation artifacts.

    This command performs the full documentation build pipeline:

    1. Introspects the Python project using Griffe
    2. Generates renderer-specific documentation sources
    3. Optionally builds the final documentation output

    Depending on the selected options, the build can target:

    - MkDocs static documentation sites
    - MCP structured documentation resources

    Args:
        mcp: Enable MCP documentation generation.
        mkdocs: Enable MkDocs documentation generation.
        module_is_source: Treat the specified module directory as the
            project root.
        module: Python module import path to document.
        project_name: Optional override for the project name.
        site_name: Display name for the MkDocs site.
        docs_dir: Directory where Markdown documentation sources
            will be generated.
        nav_file: Path to the navigation specification file.
        template: Optional custom MkDocs configuration template.
        mkdocs_yml: Output path for the generated MkDocs configuration.
        out_dir: Output directory for generated MCP resources.

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

    if mkdocs:
        if not module:
            raise click.UsageError("--module is required for MkDocs build")
        if not site_name:
            site_name = module

        click.echo(f"Generating MkDocs sources in {docs_dir}...")
        mkdocs_utils.generate_sources(
            module,
            docs_dir,
            project_name,
            module_is_source,
        )

        click.echo(f"Generating MkDocs config {mkdocs_yml}...")
        mkdocs_utils.generate_config(docs_dir, nav_file, template, mkdocs_yml, site_name)

        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("mcp_docs"), help="MCP root directory")
def serve(
    mcp: bool,
    mkdocs: bool,
    module: Optional[str],
    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: Serve documentation using the MCP server.
        mkdocs: Serve the MkDocs development site.
        module: Python module import path to serve via MCP.
        mkdocs_yml: Path to the MkDocs configuration file.
        out_dir: 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: Optional[str],
) -> 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: Python module import path to introspect.
        project_name: 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, 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: Documentation object to print.
        indent: Current indentation prefix used for nested members.
    """
    click.echo(f"{indent}├── {obj.name}")
    for member in obj.get_all_members():
        _print_object(member, indent + "│   ")