from __future__ import annotations

import argparse
import json
from collections.abc import Sequence
from pathlib import Path

from .config import DEFAULT_RANDOM_SEED, GeneratorConfig


def _parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(
        prog="generate-beihai-shipyard-aps",
        description="Generate deterministic Beihai Shipyard APS SYNTHETIC validation data.",
    )
    parser.add_argument("--seed", type=int, default=DEFAULT_RANDOM_SEED)
    parser.add_argument(
        "--scale",
        choices=("small", "standard", "full"),
        default="full",
    )
    parser.add_argument("--project-count", type=int, choices=range(1, 5))
    parser.add_argument(
        "--output",
        type=Path,
        default=Path("beihai-shipyard-aps-data"),
    )
    parser.add_argument(
        "--scenario",
        default="all",
        help="Generate all scenarios or freeze one scenario selector in dataset metadata.",
    )
    parser.add_argument("--incremental", action="store_true")
    parser.add_argument(
        "--validate-only",
        action="store_true",
        help="Build and run independent validation without exporting a directory.",
    )
    return parser


def main(argv: Sequence[str] | None = None) -> int:
    """CLI entrypoint; pipeline and validation are imported only during execution."""
    args = _parser().parse_args(argv)
    config = GeneratorConfig.for_scale(
        args.scale,
        project_count=args.project_count,
        seed=args.seed,
        scenario=args.scenario,
        incremental=args.incremental,
    )
    if args.validate_only:
        from .pipeline import build_synthetic_dataset
        from .validation import validate_bundle

        bundle = build_synthetic_dataset(config, validate=False)
        report = validate_bundle(bundle, config)
        print(json.dumps(report, ensure_ascii=False, indent=2, sort_keys=True))
        return 0 if report.get("valid") else 2

    from .pipeline import generate_to_directory

    manifest = generate_to_directory(config, args.output, validate=True)
    summary = {
        "businessDigest": manifest.get("businessDigest"),
        "fileCount": manifest.get("fileCount"),
        "output": str(args.output.expanduser().resolve(strict=False)),
        "tableRowCounts": manifest.get("tableRowCounts", {}),
    }
    print(json.dumps(summary, ensure_ascii=False, indent=2, sort_keys=True))
    return 0


if __name__ == "__main__":
    raise SystemExit(main())