#!/usr/bin/env python3
"""
Backfill versioned junction tables for requirement（strict-redundancy policy）。

使用 knowhub.knowhub_db.versioning_contract 里声明的契约——
只处理 `copy_semantics='versioned'` 的表（当前：requirement_pattern / requirement_node），
其余表（cap / resource / strategy / knowledge）属于 'fresh-per-version'，
由 ingest/duplicate 脚本自行生成，不在此处触碰。

Suffix → version 映射：目前只有 tao_dev 版带独立 req 行。

执行安全（见 docs/db-operations.md）：
  - autocommit=True
  - SET statement_timeout='120s'
  - 先 kill idle-in-tx
  - ON CONFLICT DO NOTHING（幂等）
  - 每步打印 + flush
"""
import sys
import time
from pathlib import Path

from dotenv import load_dotenv
PROJECT_ROOT = Path(__file__).resolve().parent.parent
load_dotenv(PROJECT_ROOT / '.env')
sys.path.insert(0, str(PROJECT_ROOT))

from knowhub.knowhub_db.pg_capability_store import PostgreSQLCapabilityStore  # noqa: E402
from knowhub.knowhub_db.versioning_contract import (  # noqa: E402
    duplicate_versioned_junctions,
    audit_req_junction_coverage,
    REQUIREMENT_JUNCTION_TABLES,
)


SUFFIX_TO_VERSION = {
    '__td': 'tao_dev',
}


def log(msg: str) -> None:
    print(f'[{time.strftime("%H:%M:%S")}] {msg}', flush=True)


def _print_audit(audit: dict) -> None:
    log(f"  version={audit['version']!r}  reqs={audit['total_reqs']}")
    for table, info in audit['tables'].items():
        tag = ''
        if info['semantics'] == 'versioned':
            tag = ' ✅' if info['missing'] == 0 else f"  ⚠️ 缺 {info['missing']}"
        log(f"    {table:<24} covered {info['covered']}/{audit['total_reqs']} "
            f"  [{info['semantics']}]{tag}")


def main():
    log('== 启动 backfill_requirement_pattern_versions (via contract) ==')
    log(f'契约声明 junction 表 {len(REQUIREMENT_JUNCTION_TABLES)} 张：')
    for spec in REQUIREMENT_JUNCTION_TABLES:
        log(f'  - {spec.table}  [{spec.copy_semantics}]')

    log('连接 KnowHub DB...')
    store = PostgreSQLCapabilityStore()
    cur = store._get_cursor()
    log('连接成功')

    try:
        cur.execute("SET statement_timeout = '120s'")
        log('SET statement_timeout = 120s')

        # Kill idle-in-tx
        cur.execute("""
            SELECT pid FROM pg_stat_activity
             WHERE state = 'idle in transaction'
               AND pid != pg_backend_pid()
               AND datname = current_database()
        """)
        pids = [r['pid'] for r in cur.fetchall()]
        if pids:
            log(f'发现 {len(pids)} 个 idle-in-tx：{pids}，terminate')
            for pid in pids:
                cur.execute('SELECT pg_terminate_backend(%s)', (pid,))
        else:
            log('无 idle-in-tx 会话')

        # ---- PRE-CHECK ---------------------------------------------------
        log('')
        log('========== PRE-CHECK ==========')
        for version in set(SUFFIX_TO_VERSION.values()):
            _print_audit(audit_req_junction_coverage(cur, version))

        # ---- BACKFILL ----------------------------------------------------
        log('')
        log('========== BACKFILL ==========')

        def _progress(table: str, inserted: int, elapsed: float) -> None:
            log(f'  [{table}] ✓ +{inserted} 行 ({elapsed:.2f}s)')

        for suffix, version in SUFFIX_TO_VERSION.items():
            log(f'-- suffix={suffix!r} → version={version!r} --')
            result = duplicate_versioned_junctions(
                cur, suffix, version, on_progress=_progress,
            )
            log(f'  合计：{sum(result.values())} 行')

        # ---- POST-CHECK --------------------------------------------------
        log('')
        log('========== POST-CHECK ==========')
        for version in set(SUFFIX_TO_VERSION.values()):
            _print_audit(audit_req_junction_coverage(cur, version))

        log('')
        log('== DONE ==')
    except Exception as e:
        log(f'❌ 错误：{type(e).__name__}: {e}')
        raise
    finally:
        try:
            cur.close()
        except Exception:
            pass


if __name__ == '__main__':
    main()