# -*- coding: utf-8 -*-
"""
AI 数据清理服务。

由定时任务每日凌晨 03:00 调用，执行三步清理：
1. 删除 90 天前的 ai_run_logs
2. 删除 90 天前的 ai_trigger_jobs
3. 每个 App 类型（App2~App8）的 ai_cache 保留最新 20,000 条

永久保留 App1 对话记录（ai_conversations + ai_messages），不清理。

需求: E1.1, E1.2, E1.3, E1.4, E2.1, E2.2, E2.3
"""
from __future__ import annotations

import asyncio
import logging

from app.trace.decorators import trace_service

logger = logging.getLogger(__name__)


class AICleanupService:
    """AI 数据清理服务，由定时任务调用。"""

    RETENTION_DAYS = 90
    CACHE_LIMIT_PER_APP = 20_000
    CACHE_APP_TYPES = [
        "app2_finance",
        "app3_clue",
        "app4_analysis",
        "app5_tactics",
        "app6_note_analysis",
        "app7_customer_analysis",
        "app8_clue_consolidated",
    ]

    async def run_cleanup(self) -> dict:
        """执行全部清理，返回各步骤删除记录数。

        单步清理失败记录错误日志，继续执行后续步骤。
        """
        result: dict = {}

        # 步骤 1：清理 ai_run_logs
        try:
            result["run_logs_deleted"] = await self._cleanup_run_logs()
        except Exception:
            logger.exception("清理 ai_run_logs 失败")
            result["run_logs_deleted"] = -1

        # 步骤 2：清理 ai_trigger_jobs
        try:
            result["trigger_jobs_deleted"] = await self._cleanup_trigger_jobs()
        except Exception:
            logger.exception("清理 ai_trigger_jobs 失败")
            result["trigger_jobs_deleted"] = -1

        # 步骤 3：清理 ai_cache（每个 App 类型）
        try:
            result["cache_deleted"] = await self._cleanup_cache()
        except Exception:
            logger.exception("清理 ai_cache 失败")
            result["cache_deleted"] = {}

        logger.info("AI 数据清理完成: %s", result)
        return result

    async def _cleanup_run_logs(self) -> int:
        """DELETE FROM ai_run_logs WHERE created_at < now() - 90 days。"""
        from app.database import get_connection

        conn = get_connection()
        try:
            with conn.cursor() as cur:
                # 防止锁等待超时（5 分钟）
                cur.execute("SET statement_timeout = 300000")
                cur.execute(
                    """
                    DELETE FROM biz.ai_run_logs
                    WHERE created_at < NOW() - INTERVAL '%s days'
                    """,
                    (self.RETENTION_DAYS,),
                )
                deleted = cur.rowcount
            conn.commit()
            logger.info("清理 ai_run_logs: 删除 %d 条", deleted)
            return deleted
        except Exception:
            conn.rollback()
            raise
        finally:
            conn.close()

    async def _cleanup_trigger_jobs(self) -> int:
        """DELETE FROM ai_trigger_jobs WHERE created_at < now() - 90 days。"""
        from app.database import get_connection

        conn = get_connection()
        try:
            with conn.cursor() as cur:
                cur.execute("SET statement_timeout = 300000")
                cur.execute(
                    """
                    DELETE FROM biz.ai_trigger_jobs
                    WHERE created_at < NOW() - INTERVAL '%s days'
                    """,
                    (self.RETENTION_DAYS,),
                )
                deleted = cur.rowcount
            conn.commit()
            logger.info("清理 ai_trigger_jobs: 删除 %d 条", deleted)
            return deleted
        except Exception:
            conn.rollback()
            raise
        finally:
            conn.close()

    async def _cleanup_cache(self) -> dict[str, int]:
        """每个 App 类型保留最新 20,000 条，删除超出部分。"""
        from app.database import get_connection

        result: dict[str, int] = {}
        conn = get_connection()
        try:
            with conn.cursor() as cur:
                cur.execute("SET statement_timeout = 300000")
                for app_type in self.CACHE_APP_TYPES:
                    try:
                        # 子查询：找到该 app_type 第 20001 条的 created_at 作为截断点
                        cur.execute(
                            """
                            DELETE FROM biz.ai_cache
                            WHERE app_type = %s
                              AND id NOT IN (
                                  SELECT id FROM biz.ai_cache
                                  WHERE app_type = %s
                                  ORDER BY created_at DESC
                                  LIMIT %s
                              )
                            """,
                            (app_type, app_type, self.CACHE_LIMIT_PER_APP),
                        )
                        deleted = cur.rowcount
                        result[app_type] = deleted
                        if deleted > 0:
                            logger.info(
                                "清理 ai_cache [%s]: 删除 %d 条",
                                app_type,
                                deleted,
                            )
                    except Exception:
                        logger.exception("清理 ai_cache [%s] 失败", app_type)
                        result[app_type] = -1
                        conn.rollback()
                        # 重新开始事务以继续后续 app_type
                        continue
            conn.commit()
            return result
        except Exception:
            conn.rollback()
            raise
        finally:
            conn.close()


@trace_service(description_zh="register_cleanup_job", description_en="Register Cleanup Job")
def register_cleanup_job(scheduler) -> None:  # noqa: ANN001
    """注册清理定时任务到调度器。每日 03:00 执行。

    在 main.py lifespan 中调用，或通过 scheduled_tasks 表注册。
    实际调度由 trigger_scheduler 的 cron 机制驱动：
    - job_type: 'ai_data_cleanup'
    - trigger_condition: 'cron'
    - trigger_config: {"cron_expression": "0 3 * * *"}

    需求: E2.1, E2.2, E2.3
    """
    from app.services.trigger_scheduler import register_job

    def _run_cleanup(**_kw):
        """同步包装器：在新事件循环中执行异步清理。"""
        result = asyncio.run(AICleanupService().run_cleanup())
        logger.info("定时清理任务完成: %s", result)

    register_job("ai_data_cleanup", _run_cleanup)