from __future__ import annotations

import argparse
import json
from pathlib import Path

from .adapters import GitHubActionsAdapter
from .anchors import AnchorStore
from .ledger import SQLiteLedger
from .schemas import SchemaRegistry
from .sync import SyncCursor, apply_delta, prepare_delta


def build_parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(prog="buildledger")
    sub = parser.add_subparsers(dest="command", required=True)

    sub.add_parser("schema-manifest")

    init = sub.add_parser("init-ledger")
    init.add_argument("path")

    append = sub.add_parser("append-sample")
    append.add_argument("path")

    verify = sub.add_parser("verify")
    verify.add_argument("path")

    anchor = sub.add_parser("anchor")
    anchor.add_argument("path")
    anchor.add_argument("reference")
    anchor.add_argument("--method", default="cloud-anchor")

    sync = sub.add_parser("sync-plan")
    sync.add_argument("path")
    sync.add_argument("--sequence", type=int, default=-1)
    sync.add_argument("--hash", dest="entry_hash", default="" + "0" * 64)

    gh = sub.add_parser("from-github")
    gh.add_argument("context_json")

    return parser


def main(argv: list[str] | None = None) -> int:
    parser = build_parser()
    args = parser.parse_args(argv)

    if args.command == "schema-manifest":
        print(json.dumps(SchemaRegistry.with_defaults().manifest(), indent=2, sort_keys=True))
        return 0

    if args.command == "init-ledger":
        SQLiteLedger(Path(args.path)).close()
        return 0

    if args.command == "append-sample":
        ledger = SQLiteLedger(Path(args.path))
        ledger.append("sample", {"message": "hello buildledger"})
        ledger.close()
        return 0

    if args.command == "verify":
        ledger = SQLiteLedger(Path(args.path))
        ok, issues = ledger.verify_chain()
        ledger.close()
        print(json.dumps({"ok": ok, "issues": issues}, indent=2))
        return 0 if ok else 1

    if args.command == "anchor":
        ledger = SQLiteLedger(Path(args.path))
        ref = AnchorStore(ledger).record(args.method, args.reference)
        ledger.close()
        print(ref.model_dump_json(indent=2))
        return 0

    if args.command == "sync-plan":
        ledger = SQLiteLedger(Path(args.path))
        packet = prepare_delta(ledger, SyncCursor(sequence=args.sequence, entry_hash=args.entry_hash))
        ledger.close()
        print(json.dumps({"base": packet.base_cursor.__dict__, "count": len(packet.entries), "target": packet.target_cursor.__dict__}, indent=2))
        return 0

    if args.command == "from-github":
        context = json.loads(Path(args.context_json).read_text(encoding="utf-8"))
        contract = GitHubActionsAdapter().contract_from_context(context)
        print(contract.model_dump_json(indent=2))
        return 0

    return 1


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