"""
VocabListGenerator — Manifest cleaner
----------------------------------------
Removes entries from vocab_manifest.json whose output files no longer
exist on disk.  Reads output_dir and manifest filename from batch.yaml
(falls back to sensible defaults if batch.yaml is missing).

Usage:
    python prune_manifest.py
"""

import os
import sys

import yaml

from manifest_manager import prune_missing_files, print_manifest


def main() -> None:
    # ── Resolve paths from batch.yaml (or defaults) ──────────────────────────
    script_dir = os.path.dirname(os.path.abspath(__file__))

    batch_yaml = os.path.join(script_dir, "batch.yaml")
    output_dir    = "output"
    manifest_file = "vocab_manifest.json"

    if os.path.isfile(batch_yaml):
        try:
            with open(batch_yaml, "r", encoding="utf-8") as f:
                cfg = yaml.safe_load(f) or {}
            settings      = cfg.get("settings", {})
            output_dir    = settings.get("output_dir",        output_dir)
            manifest_file = settings.get("manifest_filename", manifest_file)
        except yaml.YAMLError as e:
            print(f"  WARNING: Could not parse batch.yaml ({e}), using defaults.")

    output_dir    = os.path.join(script_dir, output_dir)
    manifest_path = os.path.join(output_dir, manifest_file)

    # ── Run prune ─────────────────────────────────────────────────────────────
    print("=" * 50)
    print("   VocabListGenerator — Manifest Cleaner")
    print("=" * 50)
    print(f"  Manifest : {manifest_path}")
    print(f"  Output   : {output_dir}")
    print()

    if not os.path.isfile(manifest_path):
        print("  No manifest file found — nothing to do.")
        sys.exit(0)

    removed = prune_missing_files(manifest_path, output_dir)

    if removed == 0:
        print("  Manifest is already clean — no stale entries found.")
    else:
        print()

    print_manifest(manifest_path)


if __name__ == "__main__":
    main()