/**
 * 定时任务管理页面。
 *
 * 展示 biz.trigger_jobs 表中所有定时任务，支持手动执行。
 */

import React, { useEffect, useState, useCallback } from 'react';
import { Table, Tag, Button, message, Modal, Typography, Card, Space, Popconfirm, Tooltip } from 'antd';
import {
  ReloadOutlined,
  ClockCircleOutlined,
  PlayCircleOutlined,
  CheckCircleOutlined,
  ExclamationCircleOutlined,
} from '@ant-design/icons';
import type { ColumnsType } from 'antd/es/table';
import { fetchTriggerJobs, runTriggerJob, clearAllTasks, type TriggerJob } from '../api/triggerJobs';

const { Title, Text } = Typography;

const TRIGGER_LABEL: Record<string, string> = {
  cron: '定时（Cron）',
  interval: '间隔',
  event: '事件触发',
};

const STATUS_COLOR: Record<string, string> = {
  enabled: 'green',
  disabled: 'default',
};

function formatTime(raw: string | null): string {
  if (!raw) return '—';
  const d = new Date(raw);
  return Number.isNaN(d.getTime()) ? raw : d.toLocaleString('zh-CN');
}

function formatTriggerConfig(job: TriggerJob): string {
  const cfg = job.trigger_config;
  if (!cfg) return '—';
  if (job.trigger_condition === 'cron') return cfg.cron_expression as string || '—';
  if (job.trigger_condition === 'interval') {
    const sec = cfg.interval_seconds as number;
    if (sec >= 3600) return `每 ${sec / 3600} 小时`;
    if (sec >= 60) return `每 ${sec / 60} 分钟`;
    return `每 ${sec} 秒`;
  }
  if (job.trigger_condition === 'event') return `事件: ${cfg.event_name || '—'}`;
  return JSON.stringify(cfg);
}

const TriggerJobs: React.FC = () => {
  const [jobs, setJobs] = useState<TriggerJob[]>([]);
  const [loading, setLoading] = useState(false);
  const [runningId, setRunningId] = useState<number | null>(null);
  const [clearing, setClearing] = useState(false);

  const load = useCallback(async () => {
    setLoading(true);
    try {
      const data = await fetchTriggerJobs();
      setJobs(data);
    } catch {
      message.error('加载定时任务失败');
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => { load(); }, [load]);

  const handleRun = async (jobId: number) => {
    setRunningId(jobId);
    try {
      const result = await runTriggerJob(jobId);
      if (result.success) {
        message.success(result.message);
      } else {
        message.error(result.message);
      }
      await load();
    } catch {
      message.error('执行失败');
    } finally {
      setRunningId(null);
    }
  };

  const handleClearAllTasks = async () => {
    setClearing(true);
    try {
      const result = await clearAllTasks();
      if (result.success) {
        Modal.success({
          title: '清空完成',
          content: result.message,
        });
        await load();
      } else {
        message.error(result.message);
      }
    } catch {
      message.error('清空任务失败');
    } finally {
      setClearing(false);
    }
  };

  const columns: ColumnsType<TriggerJob> = [
    {
      title: '任务名称', dataIndex: 'job_name', key: 'job_name', width: 180,
      render: (name: string, record) => (
        <Tooltip title={record.description || name}>
          <Text strong>{record.description || name}</Text>
          <br />
          <Text type="secondary" style={{ fontSize: 12 }}>{name}</Text>
        </Tooltip>
      ),
    },
    {
      title: '触发方式', dataIndex: 'trigger_condition', key: 'trigger_condition', width: 120,
      render: (v: string) => <Tag>{TRIGGER_LABEL[v] || v}</Tag>,
    },
    {
      title: '触发配置', key: 'trigger_config', width: 150,
      render: (_: unknown, record) => <code style={{ fontSize: 12 }}>{formatTriggerConfig(record)}</code>,
    },
    {
      title: '状态', dataIndex: 'status', key: 'status', width: 80,
      render: (v: string) => <Tag color={STATUS_COLOR[v] || 'default'}>{v === 'enabled' ? '启用' : '禁用'}</Tag>,
    },
    {
      title: '上次执行', dataIndex: 'last_run_at', key: 'last_run_at', width: 170,
      render: (v: string | null) => formatTime(v),
    },
    {
      title: '下次执行', dataIndex: 'next_run_at', key: 'next_run_at', width: 170,
      render: (v: string | null) => formatTime(v),
    },
    {
      title: '最近错误', dataIndex: 'last_error', key: 'last_error', width: 200,
      render: (v: string | null) => v
        ? <Tooltip title={v}><Text type="danger" ellipsis style={{ maxWidth: 180 }}><ExclamationCircleOutlined /> {v}</Text></Tooltip>
        : <Text type="success"><CheckCircleOutlined /> 正常</Text>,
    },
    {
      title: '操作', key: 'action', width: 100, fixed: 'right',
      render: (_: unknown, record) => (
        <Popconfirm
          title={`确认手动执行「${record.description || record.job_name}」？`}
          onConfirm={() => handleRun(record.id)}
          okText="执行"
          cancelText="取消"
        >
          <Button
            type="primary"
            size="small"
            icon={<PlayCircleOutlined />}
            loading={runningId === record.id}
            disabled={record.status !== 'enabled'}
          >
            执行
          </Button>
        </Popconfirm>
      ),
    },
  ];

  return (
    <div>
      <div style={{ marginBottom: 16, display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
        <Title level={4} style={{ margin: 0 }}>
          <ClockCircleOutlined style={{ marginRight: 8 }} />
          定时任务管理
        </Title>
        <Space>
          <Popconfirm
            title="确认清空所有助教任务？"
            description="将删除 coach_tasks 和 coach_task_history 中的全部数据，此操作不可撤销。"
            onConfirm={handleClearAllTasks}
            okText="确认清空"
            cancelText="取消"
            okButtonProps={{ danger: true }}
          >
            <Button danger loading={clearing}>🧹 清空所有任务</Button>
          </Popconfirm>
          <Button icon={<ReloadOutlined />} onClick={load} loading={loading}>刷新</Button>
        </Space>
      </div>

      <Card size="small">
        <Table<TriggerJob>
          rowKey="id"
          columns={columns}
          dataSource={jobs}
          loading={loading}
          pagination={false}
          size="small"
          scroll={{ x: 1200 }}
        />
      </Card>
    </div>
  );
};

export default TriggerJobs;