import { useEffect, useRef } from 'react';
import {
  ClipboardList, Clock, CheckCircle, AlertTriangle,
  TrendingUp, TrendingDown, Database
} from 'lucide-react';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { dashboardStats, dbInstances, statusMap, statusColorMap, dbTypeColorMap, tickets } from '@/lib/mock';
import * as echarts from 'echarts';

const stats = [
  { title: '今日工单', value: dashboardStats.todayTickets, trend: dashboardStats.todayTicketsTrend, icon: ClipboardList, color: 'text-blue-400', bg: 'bg-blue-400/10' },
  { title: '待审批', value: dashboardStats.pendingApproval, trend: dashboardStats.pendingTrend, icon: Clock, color: 'text-orange-400', bg: 'bg-orange-400/10' },
  { title: '查询审计', value: dashboardStats.queryAuditCount.toLocaleString(), trend: dashboardStats.queryTrend, icon: CheckCircle, color: 'text-purple-400', bg: 'bg-purple-400/10' },
  { title: '慢查询', value: dashboardStats.slowQueries, trend: dashboardStats.slowQueryTrend, icon: AlertTriangle, color: 'text-red-400', bg: 'bg-red-400/10' },
];

export default function Dashboard() {
  const chartRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (!chartRef.current) return;
    const chart = echarts.init(chartRef.current);
    const option: any = {
      backgroundColor: 'transparent',
      tooltip: {
        trigger: 'axis' as const,
        backgroundColor: 'rgba(22, 27, 34, 0.95)',
        borderColor: '#30363d',
        textStyle: { color: '#f0f6fc' },
      },
      legend: {
        data: ['提交工单', '执行成功', '执行失败'],
        textStyle: { color: '#8b949e' },
        bottom: 0,
        itemWidth: 14,
        itemHeight: 8,
      },
      grid: { left: '2%', right: '3%', bottom: '18%', top: '8%', containLabel: true },
      xAxis: {
        type: 'category' as const,
        data: ['周一', '周二', '周三', '周四', '周五', '周六', '周日'],
        axisLine: { lineStyle: { color: '#30363d' } },
        axisLabel: { color: '#8b949e', fontSize: 11 },
      },
      yAxis: {
        type: 'value' as const,
        axisLine: { show: false },
        splitLine: { lineStyle: { color: '#21262d' } },
        axisLabel: { color: '#8b949e', fontSize: 11 },
      },
      series: [
        {
          name: '提交工单', type: 'line', smooth: true,
          data: [120, 132, 101, 134, 90, 230, 210],
          itemStyle: { color: '#58a6ff' },
          lineStyle: { width: 2 },
          areaStyle: {
            color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
              { offset: 0, color: 'rgba(88, 166, 255, 0.3)' },
              { offset: 1, color: 'rgba(88, 166, 255, 0)' },
            ]),
          },
          symbol: 'none',
        },
        {
          name: '执行成功', type: 'line', smooth: true,
          data: [110, 125, 95, 128, 85, 215, 200],
          itemStyle: { color: '#3fb950' },
          lineStyle: { width: 2 },
          areaStyle: {
            color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
              { offset: 0, color: 'rgba(63, 185, 80, 0.3)' },
              { offset: 1, color: 'rgba(63, 185, 80, 0)' },
            ]),
          },
          symbol: 'none',
        },
        {
          name: '执行失败', type: 'line', smooth: true,
          data: [5, 3, 4, 2, 3, 8, 5],
          itemStyle: { color: '#f85149' },
          lineStyle: { width: 2 },
          symbol: 'none',
        },
      ],
    };
    chart.setOption(option);
    const handleResize = () => chart.resize();
    window.addEventListener('resize', handleResize);
    return () => { window.removeEventListener('resize', handleResize); chart.dispose(); };
  }, []);

  const onlineInstances = dbInstances.filter(i => i.status === 'online').length;
  const warningInstances = dbInstances.filter(i => i.status === 'warning').length;
  const offlineInstances = dbInstances.filter(i => i.status === 'offline').length;
  const pendingTickets = tickets.filter(t => t.status === 'pending' || t.status === 'reviewing').slice(0, 4);

  return (
    <div className="space-y-6">
      {/* 统计卡片 */}
      <div className="grid grid-cols-4 gap-5">
        {stats.map((s, i) => (
          <Card key={i} className="dg-card dg-card-hover">
            <CardContent className="p-5">
              <div className="flex items-center justify-between mb-4">
                <span className="text-sm text-[var(--dg-text-secondary)] font-medium">{s.title}</span>
                <div className={`w-10 h-10 rounded-xl ${s.bg} flex items-center justify-center`}>
                  <s.icon className={`w-5 h-5 ${s.color}`} />
                </div>
              </div>
              <div className="text-3xl font-bold text-[var(--dg-text-primary)] mb-2">{s.value}</div>
              <div className="flex items-center gap-2 text-sm">
                <span className={`flex items-center gap-1 font-medium ${s.trend >= 0 ? 'text-green-400' : 'text-red-400'}`}>
                  {s.trend >= 0 ? <TrendingUp className="w-3.5 h-3.5" /> : <TrendingDown className="w-3.5 h-3.5" />}
                  {Math.abs(s.trend)}%
                </span>
                <span className="text-[var(--dg-text-muted)]">较昨日</span>
              </div>
            </CardContent>
          </Card>
        ))}
      </div>

      {/* 图表 + 实例状态 */}
      <div className="grid grid-cols-3 gap-5">
        {/* 工单趋势图 */}
        <Card className="dg-card col-span-2">
          <CardHeader className="pb-2 border-b border-[var(--dg-border)]">
            <div className="flex items-center justify-between">
              <CardTitle className="text-[15px] font-semibold">工单趋势</CardTitle>
              <div className="flex gap-1.5">
                {['近7天', '近30天', '近90天'].map((p, i) => (
                  <button key={p} className={`px-3 py-1.5 text-xs rounded-md transition-colors ${i === 0 ? 'bg-blue-500/15 text-blue-400 border border-blue-500/30' : 'bg-[var(--dg-bg-tertiary)] text-[var(--dg-text-secondary)] border border-[var(--dg-border)] hover:border-[var(--dg-text-muted)]'}`}>
                    {p}
                  </button>
                ))}
              </div>
            </div>
          </CardHeader>
          <CardContent className="p-5">
            <div ref={chartRef} style={{ height: 300 }} />
          </CardContent>
        </Card>

        {/* 实例状态 */}
        <Card className="dg-card">
          <CardHeader className="pb-2 border-b border-[var(--dg-border)]">
            <CardTitle className="text-[15px] font-semibold">实例状态</CardTitle>
          </CardHeader>
          <CardContent className="p-0">
            <div className="p-4 border-b border-[var(--dg-border-light)]">
              <div className="grid grid-cols-3 gap-3 text-center">
                <div>
                  <div className="text-2xl font-bold text-green-400">{onlineInstances}</div>
                  <div className="text-xs text-[var(--dg-text-muted)] mt-1">在线</div>
                </div>
                <div>
                  <div className="text-2xl font-bold text-yellow-400">{warningInstances}</div>
                  <div className="text-xs text-[var(--dg-text-muted)] mt-1">告警</div>
                </div>
                <div>
                  <div className="text-2xl font-bold text-red-400">{offlineInstances}</div>
                  <div className="text-xs text-[var(--dg-text-muted)] mt-1">离线</div>
                </div>
              </div>
            </div>
            {dbInstances.slice(0, 4).map(inst => (
              <div key={inst.id} className="flex items-center px-5 py-3.5 border-b border-[var(--dg-border-light)] last:border-0 hover:bg-[var(--dg-bg-hover)] transition-colors cursor-pointer">
                <div className={`w-9 h-9 rounded-lg flex items-center justify-center mr-3.5 ${inst.dbType === 'mysql' ? 'bg-[rgba(0,117,143,0.2)] text-[#26a69a]' : inst.dbType === 'redis' ? 'bg-[rgba(220,50,32,0.2)] text-[#ef5350]' : inst.dbType === 'postgres' ? 'bg-[rgba(51,103,145,0.2)] text-[#42a5f5]' : 'bg-[rgba(71,162,72,0.2)] text-[#66bb6a]'}`}>
                  <Database className="w-4.5 h-4.5" />
                </div>
                <div className="flex-1 min-w-0">
                  <div className="text-sm font-medium truncate">{inst.name}</div>
                  <div className="text-xs text-[var(--dg-text-muted)]">{inst.host}:{inst.port}</div>
                </div>
                <span className={`px-2.5 py-1 rounded-full text-[11px] font-medium ${inst.status === 'online' ? 'bg-green-500/15 text-green-400' : inst.status === 'warning' ? 'bg-yellow-500/15 text-yellow-400' : 'bg-red-500/15 text-red-400'}`}>
                  {inst.status === 'online' ? '在线' : inst.status === 'warning' ? '告警' : '离线'}
                </span>
              </div>
            ))}
          </CardContent>
        </Card>
      </div>

      {/* 待处理工单 */}
      <Card className="dg-card">
        <CardHeader className="pb-2 border-b border-[var(--dg-border)]">
          <CardTitle className="text-[15px] font-semibold">待处理工单</CardTitle>
        </CardHeader>
        <CardContent className="p-0">
          <div className="overflow-x-auto">
            <table className="w-full text-sm">
              <thead>
                <tr className="border-b border-[var(--dg-border)] bg-[var(--dg-bg-tertiary)]">
                  <th className="text-left px-5 py-3 font-semibold text-[var(--dg-text-primary)]">工单号</th>
                  <th className="text-left px-5 py-3 font-semibold text-[var(--dg-text-primary)]">标题</th>
                  <th className="text-left px-5 py-3 font-semibold text-[var(--dg-text-primary)]">数据库</th>
                  <th className="text-left px-5 py-3 font-semibold text-[var(--dg-text-primary)]">申请人</th>
                  <th className="text-left px-5 py-3 font-semibold text-[var(--dg-text-primary)]">状态</th>
                  <th className="text-left px-5 py-3 font-semibold text-[var(--dg-text-primary)]">创建时间</th>
                  <th className="text-left px-5 py-3 font-semibold text-[var(--dg-text-primary)]">操作</th>
                </tr>
              </thead>
              <tbody>
                {pendingTickets.map(ticket => (
                  <tr key={ticket.id} className="border-b border-[var(--dg-border-light)] hover:bg-[var(--dg-bg-hover)] transition-colors">
                    <td className="px-5 py-3.5 font-mono text-xs">{ticket.id}</td>
                    <td className="px-5 py-3.5 max-w-xs truncate">{ticket.title}</td>
                    <td className="px-5 py-3.5">
                      <span className={`inline-flex items-center gap-1 px-2.5 py-1 rounded-md text-xs font-medium ${dbTypeColorMap[ticket.dbType] || ''}`}>
                        {ticket.dbType.toUpperCase()}
                      </span>
                    </td>
                    <td className="px-5 py-3.5">{ticket.applicant}</td>
                    <td className="px-5 py-3.5">
                      <span className={`inline-flex items-center gap-1.5 px-2.5 py-1 rounded-full text-xs font-medium ${statusColorMap[ticket.status] || ''}`}>
                        <span className={`w-1.5 h-1.5 rounded-full ${ticket.status === 'reviewing' ? 'bg-blue-400 animate-pulse' : ticket.status === 'pending' ? 'bg-yellow-400' : ''}`} />
                        {statusMap[ticket.status]}
                      </span>
                    </td>
                    <td className="px-5 py-3.5 text-[var(--dg-text-secondary)]">{ticket.createTime}</td>
                    <td className="px-5 py-3.5">
                      <div className="flex gap-2">
                        <button className="text-blue-400 hover:text-blue-300 text-xs font-medium transition-colors">查看</button>
                        <button className="text-green-400 hover:text-green-300 text-xs font-medium transition-colors">审批</button>
                      </div>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        </CardContent>
      </Card>
    </div>
  );
}