import React, { useState, useEffect } from 'react';
import {
  X,
  Server,
  Cpu,
  HardDrive,
  Activity,
  AlertTriangle,
  CheckCircle2,
  XCircle,
  Clock,
  Loader2,
  ChevronRight,
} from 'lucide-react';

// ============ 类型定义 ============

export type PanelType =
  | 'deviceList'       // 设备列表（按状态筛选）
  | 'alertList'        // 告警列表（按级别筛选）
  | 'deviceDetail'     // 单设备详情
  | 'taskList';        // 巡检任务列表（按状态筛选）

export interface DetailPanelProps {
  open: boolean;
  onClose: () => void;
  panelType: PanelType;
  panelTitle: string;
  // 设备列表
  deviceList?: Array<{
    id: string;
    name: string;
    ip?: string;
    type: string;
    status: 'online' | 'offline' | 'warning' | 'critical';
    cpu?: number;
    memory?: number;
    lastUpdate?: number;
    alertCount?: number;
  }>;
  // 告警列表
  alertList?: Array<{
    id: string;
    deviceId: string;
    deviceName: string;
    level: 'critical' | 'warning' | 'info';
    message: string;
    time: string;
    metric?: string;
    metricValue?: string;
    threshold?: string;
  }>;
  // 设备详情
  deviceDetail?: {
    id: string;
    name: string;
    ip?: string;
    type: string;
    status: 'online' | 'offline' | 'warning' | 'critical';
    cpu?: number;
    memory?: number;
    disk?: Array<{ mount: string; usage: number }>;
    lastUpdate?: number;
    alerts?: Array<{
      id: string;
      level: string;
      message: string;
      time: string;
    }>;
  };
  // 任务列表
  taskList?: Array<{
    deviceId: string;
    deviceName: string;
    ip: string;
    status: 'running' | 'success' | 'failed' | 'pending';
    lastScanAt?: number;
    durationMs?: number;
    errorMessage?: string;
    interval?: number;
  }>;
  // 点击设备回调
  onDeviceClick?: (deviceId: string) => void;
  // 点击告警回调
  onAlertClick?: (alertId: string) => void;
  // 告警阈值（从主进程告警规则动态派生）
  thresholds?: {
    cpuCritical: number;
    cpuWarning: number;
    memCritical: number;
    memWarning: number;
    diskCritical: number;
    diskWarning: number;
  };
}

// ============ 辅助函数 ============

const statusColors: Record<string, { bg: string; text: string; dot: string; label: string }> = {
  online:   { bg: 'bg-emerald-500/15',  text: 'text-emerald-400',  dot: 'bg-emerald-500',  label: '在线' },
  normal:   { bg: 'bg-emerald-500/15',  text: 'text-emerald-400',  dot: 'bg-emerald-500',  label: '正常' },
  offline:  { bg: 'bg-slate-500/15',    text: 'text-slate-400',    dot: 'bg-slate-500',    label: '离线' },
  warning:  { bg: 'bg-amber-500/15',    text: 'text-amber-400',    dot: 'bg-amber-500',    label: '警告' },
  critical: { bg: 'bg-red-500/15',      text: 'text-red-400',      dot: 'bg-red-500',      label: '严重' },
  running:  { bg: 'bg-sky-500/15',      text: 'text-sky-400',      dot: 'bg-sky-500',      label: '执行中' },
  success:  { bg: 'bg-emerald-500/15',  text: 'text-emerald-400',  dot: 'bg-emerald-500',  label: '成功' },
  failed:   { bg: 'bg-red-500/15',      text: 'text-red-400',      dot: 'bg-red-500',      label: '失败' },
  pending:  { bg: 'bg-slate-500/15',    text: 'text-slate-400',    dot: 'bg-slate-500',    label: '待执行' },
};

const levelColors: Record<string, { bg: string; text: string; dot: string; label: string }> = {
  critical: { bg: 'bg-red-500/15',    text: 'text-red-400',    dot: 'bg-red-500',    label: '严重' },
  major:    { bg: 'bg-orange-500/15', text: 'text-orange-400', dot: 'bg-orange-500', label: '重要' },
  warning:  { bg: 'bg-amber-500/15',  text: 'text-amber-400',  dot: 'bg-amber-500',  label: '警告' },
  minor:    { bg: 'bg-yellow-500/15', text: 'text-yellow-400', dot: 'bg-yellow-500', label: '次要' },
  info:     { bg: 'bg-sky-500/15',    text: 'text-sky-400',    dot: 'bg-sky-500',    label: '提示' },
};

function formatRelativeTime(ts?: number): string {
  if (!ts) return '-';
  const diff = Date.now() - ts;
  if (diff < 60000) return '刚刚';
  if (diff < 3600000) return `${Math.floor(diff / 60000)} 分钟前`;
  if (diff < 86400000) return `${Math.floor(diff / 3600000)} 小时前`;
  return `${Math.floor(diff / 86400000)} 天前`;
}

// ============ 组件 ============

export default function MonitoringDetailPanel({
  open,
  onClose,
  panelType,
  panelTitle,
  deviceList = [],
  alertList = [],
  deviceDetail,
  taskList = [],
  onDeviceClick,
  thresholds = { cpuCritical: 90, cpuWarning: 80, memCritical: 85, memWarning: 80, diskCritical: 90, diskWarning: 80 },
}: DetailPanelProps) {

  // ============ 设备列表渲染 ============
  const renderDeviceList = () => (
    <div className="space-y-2">
      {deviceList.length === 0 && (
        <div className="text-center py-8 text-muted-foreground text-sm">暂无数据</div>
      )}
      {deviceList.map((d) => {
        const sc = statusColors[d.status] || statusColors.online;
        return (
          <div
            key={d.id}
            className="p-3 rounded-lg border cursor-pointer transition-all hover:border-cyan-500/40 hover:bg-cyan-500/5"
            style={{ background: 'rgba(15,23,42,0.6)', borderColor: 'rgba(148,163,184,0.15)' }}
            onClick={() => onDeviceClick?.(d.id)}
          >
            <div className="flex items-center justify-between mb-1.5">
              <div className="flex items-center gap-2 min-w-0">
                <div className={`w-2 h-2 rounded-full ${sc.dot} flex-shrink-0`} />
                <span className="text-sm font-medium text-foreground truncate">{d.name}</span>
              </div>
              <ChevronRight className="w-4 h-4 text-muted-foreground flex-shrink-0" />
            </div>
            <div className="flex items-center gap-3 text-xs text-muted-foreground">
              {d.ip && <span>{d.ip}</span>}
              <span>{d.type}</span>
              <span className={`${sc.text}`}>{sc.label}</span>
            </div>
            {(d.cpu !== undefined || d.memory !== undefined) && (
              <div className="flex items-center gap-4 mt-2 text-xs">
                {d.cpu !== undefined && (
                  <div className="flex items-center gap-1">
                    <Cpu className="w-3 h-3 text-muted-foreground" />
                    <span className="text-muted-foreground">CPU</span>
                    <span className={d.cpu > thresholds.cpuCritical ? 'text-red-400' : d.cpu > thresholds.cpuWarning ? 'text-amber-400' : 'text-emerald-400'}>
                      {d.cpu}%
                    </span>
                  </div>
                )}
                {d.memory !== undefined && (
                  <div className="flex items-center gap-1">
                    <HardDrive className="w-3 h-3 text-muted-foreground" />
                    <span className="text-muted-foreground">内存</span>
                    <span className={d.memory > thresholds.memCritical ? 'text-red-400' : d.memory > thresholds.memWarning ? 'text-amber-400' : 'text-emerald-400'}>
                      {d.memory}%
                    </span>
                  </div>
                )}
              </div>
            )}
          </div>
        );
      })}
    </div>
  );

  // ============ 告警列表渲染 ============
  const renderAlertList = () => (
    <div className="space-y-2">
      {alertList.length === 0 && (
        <div className="text-center py-8 text-emerald-400 text-sm">暂无告警</div>
      )}
      {alertList.map((a) => {
        const lc = levelColors[a.level] || levelColors.info;
        return (
          <div
            key={a.id}
            className="p-3 rounded-lg border transition-all"
            style={{ background: 'rgba(15,23,42,0.6)', borderColor: 'rgba(148,163,184,0.15)' }}
          >
            <div className="flex items-start justify-between gap-2 mb-1">
              <div className="flex items-center gap-2 min-w-0">
                <div className={`w-2 h-2 rounded-full ${lc.dot} flex-shrink-0 mt-0.5`} />
                <span className={`text-xs font-medium ${lc.text} flex-shrink-0`}>{lc.label}</span>
              </div>
              <span className="text-xs text-muted-foreground flex-shrink-0">{a.time}</span>
            </div>
            <div className="text-sm text-foreground mb-1">{a.message}</div>
            <div className="text-xs text-muted-foreground">
              设备：<span className="text-cyan-400">{a.deviceName}</span>
              {a.metric && a.metricValue && (
                <span className="ml-3">
                  {a.metric}: {a.metricValue}
                  {a.threshold && <span className="text-muted-foreground"> (阈值 {a.threshold})</span>}
                </span>
              )}
            </div>
          </div>
        );
      })}
    </div>
  );

  // ============ 设备详情渲染 ============
  const renderDeviceDetail = () => {
    if (!deviceDetail) return null;
    const sc = statusColors[deviceDetail.status] || statusColors.online;
    return (
      <div className="space-y-4">
        {/* 基本信息 */}
        <div className="p-3 rounded-lg border" style={{ background: 'rgba(15,23,42,0.6)', borderColor: 'rgba(148,163,184,0.15)' }}>
          <div className="flex items-center gap-2 mb-2">
            <Server className="w-4 h-4 text-cyan-400" />
            <span className="text-sm font-medium">基本信息</span>
          </div>
          <div className="grid grid-cols-2 gap-2 text-xs">
            <div>
              <div className="text-muted-foreground mb-0.5">设备名称</div>
              <div className="text-foreground font-medium">{deviceDetail.name}</div>
            </div>
            <div>
              <div className="text-muted-foreground mb-0.5">设备类型</div>
              <div className="text-foreground">{deviceDetail.type}</div>
            </div>
            <div>
              <div className="text-muted-foreground mb-0.5">IP 地址</div>
              <div className="text-foreground font-mono">{deviceDetail.ip || '-'}</div>
            </div>
            <div>
              <div className="text-muted-foreground mb-0.5">运行状态</div>
              <div className={`${sc.text} font-medium`}>{sc.label}</div>
            </div>
          </div>
        </div>

        {/* 资源使用 */}
        <div className="p-3 rounded-lg border" style={{ background: 'rgba(15,23,42,0.6)', borderColor: 'rgba(148,163,184,0.15)' }}>
          <div className="flex items-center gap-2 mb-3">
            <Activity className="w-4 h-4 text-cyan-400" />
            <span className="text-sm font-medium">资源使用</span>
          </div>
          <div className="space-y-3">
            {/* CPU */}
            <div>
              <div className="flex items-center justify-between text-xs mb-1">
                <span className="text-muted-foreground">CPU 使用率</span>
                <span className={deviceDetail.cpu && deviceDetail.cpu > thresholds.cpuCritical ? 'text-red-400' : deviceDetail.cpu && deviceDetail.cpu > thresholds.cpuWarning ? 'text-amber-400' : 'text-foreground'}>
                  {deviceDetail.cpu ?? '-'}%
                </span>
              </div>
              <div className="h-1.5 rounded-full bg-slate-700/50 overflow-hidden">
                <div
                  className="h-full rounded-full transition-all"
                  style={{
                    width: `${deviceDetail.cpu ?? 0}%`,
                    background: deviceDetail.cpu && deviceDetail.cpu > thresholds.cpuCritical ? '#f87171'
                      : deviceDetail.cpu && deviceDetail.cpu > thresholds.cpuWarning ? '#fbbf24' : '#34d399',
                  }}
                />
              </div>
            </div>
            {/* 内存 */}
            <div>
              <div className="flex items-center justify-between text-xs mb-1">
                <span className="text-muted-foreground">内存使用率</span>
                <span className={deviceDetail.memory && deviceDetail.memory > thresholds.memCritical ? 'text-red-400' : deviceDetail.memory && deviceDetail.memory > thresholds.memWarning ? 'text-amber-400' : 'text-foreground'}>
                  {deviceDetail.memory ?? '-'}%
                </span>
              </div>
              <div className="h-1.5 rounded-full bg-slate-700/50 overflow-hidden">
                <div
                  className="h-full rounded-full transition-all"
                  style={{
                    width: `${deviceDetail.memory ?? 0}%`,
                    background: deviceDetail.memory && deviceDetail.memory > thresholds.memCritical ? '#f87171'
                      : deviceDetail.memory && deviceDetail.memory > thresholds.memWarning ? '#fbbf24' : '#34d399',
                  }}
                />
              </div>
            </div>
            {/* 磁盘 */}
            {deviceDetail.disk && deviceDetail.disk.length > 0 && (
              <div className="space-y-2">
                <div className="text-xs text-muted-foreground">磁盘使用率</div>
                {deviceDetail.disk.map((d, i) => (
                  <div key={i}>
                    <div className="flex items-center justify-between text-xs mb-1">
                      <span className="text-muted-foreground font-mono">{d.mount}</span>
                      <span className={d.usage > thresholds.diskCritical ? 'text-red-400' : d.usage > thresholds.diskWarning ? 'text-amber-400' : 'text-foreground'}>
                        {d.usage}%
                      </span>
                    </div>
                    <div className="h-1.5 rounded-full bg-slate-700/50 overflow-hidden">
                      <div
                        className="h-full rounded-full transition-all"
                        style={{
                          width: `${d.usage}%`,
                          background: d.usage > thresholds.diskCritical ? '#f87171' : d.usage > thresholds.diskWarning ? '#fbbf24' : '#34d399',
                        }}
                      />
                    </div>
                  </div>
                ))}
              </div>
            )}
          </div>
        </div>

        {/* 更新时间 */}
        <div className="text-xs text-muted-foreground flex items-center gap-1.5">
          <Clock className="w-3 h-3" />
          最后更新：{formatRelativeTime(deviceDetail.lastUpdate)}
        </div>

        {/* 告警历史 */}
        {deviceDetail.alerts && deviceDetail.alerts.length > 0 && (
          <div className="p-3 rounded-lg border" style={{ background: 'rgba(15,23,42,0.6)', borderColor: 'rgba(148,163,184,0.15)' }}>
            <div className="flex items-center gap-2 mb-2">
              <AlertTriangle className="w-4 h-4 text-amber-400" />
              <span className="text-sm font-medium">告警记录</span>
            </div>
            <div className="space-y-2">
              {deviceDetail.alerts.map((a) => {
                const lc = levelColors[a.level] || levelColors.info;
                return (
                  <div key={a.id} className="flex items-start gap-2 text-xs">
                    <div className={`w-1.5 h-1.5 rounded-full ${lc.dot} flex-shrink-0 mt-1`} />
                    <div className="flex-1 min-w-0">
                      <div className="text-foreground">{a.message}</div>
                      <div className="text-muted-foreground mt-0.5">{a.time}</div>
                    </div>
                  </div>
                );
              })}
            </div>
          </div>
        )}
      </div>
    );
  };

  // ============ 任务列表渲染 ============
  const renderTaskList = () => (
    <div className="space-y-2">
      {taskList.length === 0 && (
        <div className="text-center py-8 text-muted-foreground text-sm">暂无数据</div>
      )}
      {taskList.map((t) => {
        const sc = statusColors[t.status] || statusColors.pending;
        const durationStr = t.durationMs ? `${(t.durationMs / 1000).toFixed(1)}s` : null;
        const intervalStr = t.interval ? `${t.interval}秒` : null;
        return (
          <div
            key={t.deviceId}
            className="p-3 rounded-lg border transition-all"
            style={{ background: 'rgba(15,23,42,0.6)', borderColor: 'rgba(148,163,184,0.15)' }}
          >
            <div className="flex items-center justify-between mb-1">
              <div className="flex items-center gap-2 min-w-0">
                {t.status === 'running' && <Loader2 className="w-3.5 h-3.5 text-sky-400 animate-spin flex-shrink-0" />}
                {t.status === 'success' && <CheckCircle2 className="w-3.5 h-3.5 text-emerald-400 flex-shrink-0" />}
                {t.status === 'failed' && <XCircle className="w-3.5 h-3.5 text-red-400 flex-shrink-0" />}
                {t.status === 'pending' && <Clock className="w-3.5 h-3.5 text-slate-400 flex-shrink-0" />}
                <span className="text-sm font-medium text-foreground truncate">{t.deviceName}</span>
              </div>
              <span className={`text-xs font-medium ${sc.text} flex-shrink-0`}>{sc.label}</span>
            </div>
            <div className="text-xs text-muted-foreground font-mono mb-1">{t.ip}</div>
            <div className="flex items-center gap-3 text-xs text-muted-foreground flex-wrap">
              {t.lastScanAt && <span>上次 {formatRelativeTime(t.lastScanAt)}</span>}
              {durationStr && <span>耗时 {durationStr}</span>}
              {intervalStr && <span>间隔 {intervalStr}</span>}
            </div>
            {t.errorMessage && (
              <div className="mt-2 text-xs text-red-400 bg-red-500/10 p-2 rounded">
                {t.errorMessage}
              </div>
            )}
          </div>
        );
      })}
    </div>
  );

  // ============ 主渲染 ============
  return (
    <>
      {/* 遮罩 */}
      <div
        className={`absolute inset-0 bg-black/50 z-40 transition-opacity ${
          open ? 'opacity-100' : 'opacity-0 pointer-events-none'
        }`}
        onClick={onClose}
      />
      {/* 面板 */}
      <div
        className={`absolute right-0 top-0 bottom-0 z-50 transition-transform duration-300 ease-out flex flex-col ${
          open ? 'translate-x-0' : 'translate-x-full'
        }`}
        style={{
          width: '420px',
          background: '#0f172a',
          borderLeft: '1px solid rgba(148,163,184,0.2)',
        }}
      >
        {/* 标题栏 */}
        <div
          className="flex items-center justify-between px-4 py-3 flex-shrink-0"
          style={{ borderBottom: '1px solid rgba(148,163,184,0.15)' }}
        >
          <div className="flex items-center gap-2">
            <div
              className="w-1 h-5 rounded-full"
              style={{ background: 'linear-gradient(180deg, #06b6d4, #3b82f6)' }}
            />
            <span className="text-sm font-medium text-foreground">{panelTitle}</span>
          </div>
          <button
            onClick={onClose}
            className="p-1 rounded hover:bg-slate-700/50 text-muted-foreground hover:text-foreground transition-colors"
          >
            <X className="w-4 h-4" />
          </button>
        </div>

        {/* 内容区 */}
        <div className="flex-1 overflow-y-auto p-3">
          {panelType === 'deviceList' && renderDeviceList()}
          {panelType === 'alertList' && renderAlertList()}
          {panelType === 'deviceDetail' && renderDeviceDetail()}
          {panelType === 'taskList' && renderTaskList()}
        </div>
      </div>
    </>
  );
}