# -*- coding: utf-8 -*-
"""
回填脚本：为 3 张指数表生成历史日快照

按日期升序逐天执行 RelationIndexTask / WinbackIndexTask / NewconvIndexTask，
写入 stat_date 列，支持多日快照共存。

用法：
    cd C:\\Project\\NeoZQYY
    uv run python scripts/ops/backfill_index_snapshots.py \\
        --start 2025-08-01 --end 2026-04-11

    # 仅回填 relation_index
    uv run python scripts/ops/backfill_index_snapshots.py \\
        --start 2025-08-01 --end 2026-04-11 --tasks RELATION

    # 干跑模式（不写数据库）
    uv run python scripts/ops/backfill_index_snapshots.py \\
        --start 2025-08-01 --end 2025-08-03 --dry-run
"""
from __future__ import annotations

import argparse
import logging
import sys
import time
from datetime import date, datetime, timedelta
from pathlib import Path
from zoneinfo import ZoneInfo

# ── 环境加载 ──
sys.path.insert(0, str(Path(__file__).resolve().parent))
from _env_paths import ensure_repo_root

ensure_repo_root()

# 切换到 ETL 目录以便导入任务模块
import os
_ETL_ROOT = Path(__file__).resolve().parents[2] / "apps" / "etl" / "connectors" / "feiqiu"
sys.path.insert(0, str(_ETL_ROOT))
os.chdir(_ETL_ROOT)

from dotenv import load_dotenv
_ROOT = Path(__file__).resolve().parents[2]
load_dotenv(_ROOT / ".env", override=False)
load_dotenv(_ETL_ROOT / ".env", override=False)

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(message)s",
)
logger = logging.getLogger("backfill_index")

# ── 导入 ETL 组件 ──
from config.settings import AppConfig
from database.connection import DatabaseConnection
from tasks.base_task import TaskContext
from tasks.dws.index.relation_index_task import RelationIndexTask
from tasks.dws.index.winback_index_task import WinbackIndexTask
from tasks.dws.index.newconv_index_task import NewconvIndexTask

TZ = ZoneInfo("Asia/Shanghai")

# 任务代码映射
TASK_MAP = {
    "RELATION": RelationIndexTask,
    "WINBACK": WinbackIndexTask,
    "NEWCONV": NewconvIndexTask,
}


class DummyAPI:
    """指数任务不需要 API，提供空壳。"""
    pass


def build_context(d: date, store_id: int) -> TaskContext:
    """为指定日期构建 TaskContext。"""
    as_of = datetime(d.year, d.month, d.day, 23, 59, 0, tzinfo=TZ)
    window_end = as_of
    window_start = as_of - timedelta(days=90)
    return TaskContext(
        store_id=store_id,
        window_start=window_start,
        window_end=window_end,
        window_minutes=int((window_end - window_start).total_seconds() / 60),
        as_of_date=as_of,
    )


def run_backfill(
    start_date: date,
    end_date: date,
    task_keys: list[str],
    dry_run: bool = False,
):
    """执行回填主流程。"""
    # 加载配置
    config = AppConfig.load()

    # 创建数据库连接
    db_conn = DatabaseConnection(
        dsn=config.config["db"]["dsn"],
        session=config.config["db"].get("session"),
        connect_timeout=config.config["db"].get("connect_timeout_sec"),
    )

    store_id = config.config["app"]["store_id"]
    total_days = (end_date - start_date).days + 1
    total_tasks = total_days * len(task_keys)

    logger.info(
        "回填参数: %s ~ %s (%d天), 任务=%s, store_id=%s, dry_run=%s",
        start_date, end_date, total_days, task_keys, store_id, dry_run,
    )

    if dry_run:
        logger.info("[DRY RUN] 仅计算不写入数据库")

    completed = 0
    errors = 0
    t0 = time.time()

    current = start_date
    while current <= end_date:
        ctx = build_context(current, store_id)
        day_t0 = time.time()

        for key in task_keys:
            task_cls = TASK_MAP[key]
            task = task_cls(config, db_conn, DummyAPI(), logger)

            if dry_run:
                logger.info("[DRY RUN] 跳过 %s %s", key, current)
                completed += 1
                continue

            try:
                result = task.execute(ctx)
                records = result.get("records_inserted", result.get("member_count", "?"))
                logger.info(
                    "  %s %s → %s 条记录",
                    key, current, records,
                )
                completed += 1
            except Exception:
                logger.exception("  %s %s 失败", key, current)
                errors += 1
                # 尝试恢复连接
                try:
                    db_conn.close()
                    db_conn = DatabaseConnection(
                        dsn=config.config["db"]["dsn"],
                        session=config.config["db"].get("session"),
                        connect_timeout=config.config["db"].get("connect_timeout_sec"),
                    )
                    # 更新任务引用
                except Exception:
                    logger.exception("数据库重连失败")

        elapsed = time.time() - day_t0
        progress = completed / total_tasks * 100 if total_tasks else 0
        logger.info(
            "✓ %s 完成 (%.1fs) [%d/%d %.0f%%]",
            current, elapsed, completed, total_tasks, progress,
        )

        current += timedelta(days=1)

    total_elapsed = time.time() - t0
    logger.info(
        "回填完成: %d/%d 成功, %d 失败, 耗时 %.1f 秒 (%.1f 分钟)",
        completed, total_tasks, errors, total_elapsed, total_elapsed / 60,
    )

    db_conn.close()
    return errors == 0


def main():
    parser = argparse.ArgumentParser(description="回填指数表历史日快照")
    parser.add_argument("--start", required=True, help="起始日期 (YYYY-MM-DD)")
    parser.add_argument("--end", required=True, help="结束日期 (YYYY-MM-DD)")
    parser.add_argument(
        "--tasks",
        default="RELATION,WINBACK,NEWCONV",
        help="任务列表，逗号分隔 (RELATION/WINBACK/NEWCONV)",
    )
    parser.add_argument("--dry-run", action="store_true", help="干跑模式，不写数据库")
    args = parser.parse_args()

    start_date = date.fromisoformat(args.start)
    end_date = date.fromisoformat(args.end)
    task_keys = [k.strip().upper() for k in args.tasks.split(",")]

    for k in task_keys:
        if k not in TASK_MAP:
            print(f"错误：未知任务 {k}，可选: {list(TASK_MAP.keys())}", file=sys.stderr)
            sys.exit(1)

    if start_date > end_date:
        print("错误：start 必须 <= end", file=sys.stderr)
        sys.exit(1)

    success = run_backfill(start_date, end_date, task_keys, dry_run=args.dry_run)
    sys.exit(0 if success else 1)


if __name__ == "__main__":
    main()