#!/usr/bin/env python3
"""Sync the local Forgejo cache at ``tools/.cache/forgejo.sqlite``.

This tool is the human-facing wrapper around ``_pipeline_cache.PipelineCache``.
On a cold cache it pulls the full master commit history and every PR the
repo has ever had. On a warm cache it pulls only deltas (new commits since
last sync, PRs whose ``updated_at`` has advanced).

Usage
-----

Typical incremental refresh::

    python3 tools/forgejo-sync.py

Seed a fresh cache from scratch (destructive)::

    python3 tools/forgejo-sync.py --full

After any sync, back-fill ``merged_by`` details for every merged PR so
downstream reports don't have to fetch per-PR detail on read::

    python3 tools/forgejo-sync.py --backfill

Show cache statistics::

    python3 tools/forgejo-sync.py --stats

The cache file lives under ``tools/.cache/`` and is gitignored.
"""
from __future__ import annotations

import argparse
import json
import os
import sys
from pathlib import Path

# Ensure we can import the sibling cache module regardless of cwd.
sys.path.insert(0, str(Path(__file__).resolve().parent))
from _pipeline_cache import (  # noqa: E402
    PipelineCache,
    DEFAULT_CACHE_PATH,
)


def _load_token() -> str:
    token = os.environ.get("GITEA_TOKEN")
    if token:
        return token.strip().strip('"').strip("'")
    repo_root = Path(__file__).resolve().parent.parent
    for envfile in (repo_root / ".devcontainer" / ".env", repo_root / ".env"):
        if not envfile.is_file():
            continue
        for line in envfile.read_text().splitlines():
            line = line.strip()
            if not line or line.startswith("#") or "=" not in line:
                continue
            k, _, v = line.partition("=")
            if k.strip() == "GITEA_TOKEN":
                return v.strip().strip('"').strip("'")
    sys.exit(
        "ERROR: GITEA_TOKEN not found. Set it in the environment "
        "or in .devcontainer/.env (or .env)."
    )


def _parse_args() -> argparse.Namespace:
    p = argparse.ArgumentParser(
        description="Sync the local Forgejo cache (SQLite at tools/.cache/forgejo.sqlite).",
    )
    p.add_argument(
        "--full", action="store_true",
        help="Truncate commits & pulls tables and resync from scratch. "
             "Use after a force-push to master or to rebuild from clean state.",
    )
    p.add_argument(
        "--backfill", action="store_true",
        help="After syncing, fetch PR detail for every closed+merged PR missing "
             "merged_by (one-shot per PR, permanent). Adds a few minutes on a "
             "cold cache but makes subsequent reports offline-instant.",
    )
    p.add_argument(
        "--stats", action="store_true",
        help="Print cache statistics and exit; do not sync.",
    )
    p.add_argument(
        "--cache", type=Path, default=DEFAULT_CACHE_PATH,
        help=f"Cache file path (default: {DEFAULT_CACHE_PATH}).",
    )
    p.add_argument(
        "--quiet", action="store_true",
        help="Suppress progress logs; summary JSON is still printed.",
    )
    return p.parse_args()


def main() -> None:
    args = _parse_args()
    cache = PipelineCache.open(args.cache)

    if args.stats:
        print(json.dumps(cache.stats(), indent=2))
        return

    token = _load_token()
    summary = cache.sync(
        token,
        full=args.full,
        backfill_details=args.backfill,
        progress=not args.quiet,
    )
    summary["cache"] = cache.stats()
    print(json.dumps(summary, indent=2))


if __name__ == "__main__":
    main()