# -*- coding: utf-8 -*-
from __future__ import annotations

from typing import Any, Awaitable, Callable, Dict, List

from db.system_job_db import SystemJobDBOperator
from utils.decorator.async_job import async_job


def get_system_job_definitions(robot) -> List[Dict[str, Any]]:
    """系统任务定义（业务函数映射）。

    说明：这里只维护“任务 key 与业务函数”的绑定关系；
    调度时间、启停状态全部从数据库 t_system_jobs 读取。
    """
    return [
        {
            "job_key": "message_count_to_db",
            "name": "消息计数入库",
            "description": "每天 02:30 将 Redis 消息计数写入 SQLite",
            "trigger_type": "at_times",
            "trigger_config": {"time_list": ["02:30"]},
            "handler": robot.message_count_to_db,
        },
        {
            "job_key": "login_check",
            "name": "登录状态巡检",
            "description": "每天 14:43 执行登录二次校验",
            "trigger_type": "at_times",
            "trigger_config": {"time_list": ["14:43"]},
            "handler": robot.login_twice_auto_auth,
        },
        {
            "job_key": "process_pending_images",
            "name": "待下载图片补偿处理",
            "description": "每 5 分钟处理一次待下载图片/表情，避免数据库锁竞争",
            "trigger_type": "every_seconds",
            "trigger_config": {"seconds": 300},
            "handler": _build_process_pending_images_handler(robot),
        },
    ]

def _build_process_pending_images_handler(robot) -> Callable[[], Awaitable[None]]:
    async def _handler():
        if hasattr(robot, "message_storage") and robot.message_storage:
            await robot.message_storage.process_pending_images(minutes_ago=10, batch_size=20)

    return _handler


class SystemJobLoader:
    """系统任务加载器：从数据库读取调度配置并注册到 async_job。"""

    def __init__(self, robot, system_job_db: SystemJobDBOperator):
        self.robot = robot
        self.db = system_job_db
        self._job_defs = {item["job_key"]: item for item in get_system_job_definitions(robot)}
        self._registered_job_ids: List[str] = []

    def init_and_load(self):
        self.db.init_tables()
        self._seed_defaults()
        self.reload_from_db()

    def _seed_defaults(self):
        for item in self._job_defs.values():
            existed = self.db.get_job(item["job_key"])
            if existed:
                continue
            self.db.upsert_job(
                {
                    "job_key": item["job_key"],
                    "name": item["name"],
                    "description": item.get("description", ""),
                    "trigger_type": item["trigger_type"],
                    "trigger_config": item["trigger_config"],
                    "enabled": True,
                }
            )

    def reload_from_db(self):
        # 每次重载前先补齐默认任务，避免误删后无法恢复
        self._seed_defaults()

        # 先移除当前注册任务，避免重复调度
        for job_id in self._registered_job_ids:
            async_job.remove_job(job_id)
        self._registered_job_ids = []

        jobs = self.db.list_jobs()
        for row in jobs:
            job_key = row.get("job_key")
            if not row.get("enabled", 1):
                continue
            definition = self._job_defs.get(job_key)
            if not definition:
                logger.warning(f"系统任务 {job_key} 在代码中无处理器，已跳过注册")
                continue

            handler = definition["handler"]
            job_id = async_job.register_callable(
                func=handler,
                trigger_type=row.get("trigger_type", definition["trigger_type"]),
                trigger_config=row.get("trigger_config", definition["trigger_config"]),
                job_name=row.get("name") or definition["name"],
                description=row.get("description") or definition.get("description", ""),
                job_key=job_key,
            )
            self._registered_job_ids.append(job_id)