from pathlib import Path
from importlib import resources
import click
import yaml
from docforge.loaders import GriffeLoader, discover_module_paths
from docforge.renderers import MkDocsRenderer
from docforge.nav import load_nav_spec, resolve_nav, MkDocsNavEmitter

def generate_sources(module: str, project_name: str | None, docs_dir: Path) -> None:
    """
    Generate Markdown source files for the specified module.

    Args:
        module: The dotted path of the primary module to document.
        project_name: Optional override for the project name.
        docs_dir: Directory where the generated Markdown files will be written.
    """
    loader = GriffeLoader()
    discovered_paths = discover_module_paths(module)
    project = loader.load_project(discovered_paths, project_name)

    renderer = MkDocsRenderer()
    renderer.generate_sources(project, docs_dir)

def generate_config(docs_dir: Path, nav_file: Path, template: Path | None, out: Path, site_name: str) -> None:
    """
    Generate an mkdocs.yml configuration file.

    Args:
        docs_dir: Path to the directory containing documentation Markdown files.
        nav_file: Path to the docforge.nav.yml specification.
        template: Optional path to an mkdocs.yml template (overrides built-in).
        out: Path where the final mkdocs.yml will be written.
        site_name: The display name for the documentation site.
    """
    if not nav_file.exists():
        raise click.FileError(str(nav_file), hint="Nav spec not found")

    spec = load_nav_spec(nav_file)
    resolved = resolve_nav(spec, docs_dir)
    nav_block = MkDocsNavEmitter().emit(resolved)

    # Load template
    if template is not None:
        if not template.exists():
            raise click.FileError(str(template), hint="Template not found")
        data = yaml.safe_load(template.read_text(encoding="utf-8"))
    else:
        text = (
            resources.files("docforge.templates")
            .joinpath("mkdocs.sample.yml")
            .read_text(encoding="utf-8")
        )
        data = yaml.safe_load(text)

    data["site_name"] = site_name
    data["nav"] = nav_block

    out.write_text(yaml.safe_dump(data, sort_keys=False), encoding="utf-8")

def build(mkdocs_yml: Path) -> None:
    """
    Build the documentation site using MkDocs.

    Args:
        mkdocs_yml: Path to the mkdocs.yml configuration file.
    """
    if not mkdocs_yml.exists():
        raise click.ClickException(f"mkdocs.yml not found: {mkdocs_yml}")

    from mkdocs.config import load_config
    from mkdocs.commands.build import build as mkdocs_build

    mkdocs_build(load_config(str(mkdocs_yml)))

def serve(mkdocs_yml: Path) -> None:
    """
    Serve the documentation site with live-reload using MkDocs.

    Args:
        mkdocs_yml: Path to the mkdocs.yml configuration file.
    """
    if not mkdocs_yml.exists():
        raise click.ClickException(f"mkdocs.yml not found: {mkdocs_yml}")

    from mkdocs.commands.serve import serve as mkdocs_serve
    mkdocs_serve(config_file=str(mkdocs_yml))