"""Generate the code reference pages and navigation.

This script is executed by mkdocs-gen-files during the docs build.
It walks the `src/cleveragents` package tree and generates a `.md`
page for every public Python module. Each page contains an
mkdocstrings `::: module.path` directive so the API docs are
rendered from live docstrings.

A `SUMMARY.md` file is also written so that mkdocs-literate-nav can
build the Reference section of the sidebar automatically.
"""

from pathlib import Path

import mkdocs_gen_files

nav = mkdocs_gen_files.Nav()

SRC_DIR = Path("src")
PACKAGE = "cleveragents"


def _is_proper_package(py_file: Path) -> bool:
    """Return True only if every ancestor directory (up to SRC_DIR) has an __init__.py.

    This filters out stray .py files that live in directories without
    __init__.py (e.g. templates/renderer.py) which griffe cannot resolve.
    """
    parent = py_file.parent
    while parent != SRC_DIR:
        if not (parent / "__init__.py").exists():
            return False
        parent = parent.parent
    return True


# Walk every .py file under src/cleveragents
for path in sorted(SRC_DIR.rglob("*.py")):
    # Only include modules that belong to proper Python packages
    if not _is_proper_package(path):
        continue

    # Compute the dotted module path and the docs destination path
    module_path = path.relative_to(SRC_DIR).with_suffix(
        ""
    )  # e.g. cleveragents/domain/models/core/plan
    doc_path = path.relative_to(SRC_DIR).with_suffix(
        ".md"
    )  # e.g. cleveragents/domain/models/core/plan.md
    full_doc_path = Path(
        "reference", doc_path
    )  # e.g. reference/cleveragents/domain/models/core/plan.md

    parts = tuple(module_path.parts)

    # Skip __main__ — not useful API surface
    if parts[-1] == "__main__":
        continue

    # For __init__.py files, use the package itself as the page
    if parts[-1] == "__init__":
        parts = parts[:-1]
        doc_path = doc_path.with_name("index.md")
        full_doc_path = full_doc_path.with_name("index.md")

    # Build the nav entry
    nav_parts = parts  # e.g. ("cleveragents", "domain", "models", "core", "plan")
    nav[nav_parts] = doc_path.as_posix()

    # Write the stub .md page with the mkdocstrings directive
    dotted = ".".join(parts)  # e.g. "cleveragents.domain.models.core.plan"
    with mkdocs_gen_files.open(full_doc_path, "w") as fd:
        fd.write(f"# `{dotted}`\n\n")
        fd.write(f"::: {dotted}\n")

    # Tell mkdocs-gen-files where the edit link should point
    mkdocs_gen_files.set_edit_path(full_doc_path, path.as_posix())

# Include manually-authored reference pages that live alongside the
# auto-generated API docs.
nav[("actors_schema",)] = "actors_schema.md"

# Write the literate-nav summary file for the Reference section
with mkdocs_gen_files.open("reference/SUMMARY.md", "w") as nav_file:
    nav_file.writelines(nav.build_literate_nav())