import {
  AlertTriangle,
  CheckCircle,
  XCircle,
  Clock,
  MessageSquare,
  RefreshCw,
  Filter,
  Info,
  AlertOctagon,
  Bell,
  ChevronRight,
} from "lucide-react";
import React, { useEffect, useState, useCallback } from "react";
import { Button } from "../ui/button";
import { Badge } from "../ui/badge";
import { Input } from "../ui/input";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "../ui/select";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "../ui/dialog";
import { Label } from "../ui/label";
import { Textarea } from "../ui/textarea";
import {
  inspectionAlertApi,
  type AlertRecord,
  type AlertLevel,
  type AlertRecordStatus,
  type AlertStats,
} from "../../infrastructure/inspection/inspectionApi";
import { toast } from "../ui/toast";

const LEVEL_COLORS: Record<AlertLevel, { bg: string; text: string; border: string; dot: string }> = {
  critical: {
    bg: "bg-red-500/10",
    text: "text-red-500",
    border: "border-red-500/30",
    dot: "bg-red-500",
  },
  warning: {
    bg: "bg-orange-500/10",
    text: "text-orange-500",
    border: "border-orange-500/30",
    dot: "bg-orange-500",
  },
  info: {
    bg: "bg-blue-500/10",
    text: "text-blue-500",
    border: "border-blue-500/30",
    dot: "bg-blue-500",
  },
};

const LEVEL_LABELS: Record<AlertLevel, string> = {
  critical: "严重",
  warning: "警告",
  info: "提示",
};

const STATUS_LABELS: Record<AlertRecordStatus, string> = {
  active: "待处理",
  acknowledged: "已确认",
  resolved: "已恢复",
  closed: "已关闭",
};

const STATUS_COLORS: Record<AlertRecordStatus, string> = {
  active: "text-red-500",
  acknowledged: "text-orange-500",
  resolved: "text-green-500",
  closed: "text-muted-foreground",
};

export function AlertCenterPage() {
  const [alerts, setAlerts] = useState<AlertRecord[]>([]);
  const [stats, setStats] = useState<AlertStats | null>(null);
  const [loading, setLoading] = useState(true);
  const [selectedAlert, setSelectedAlert] = useState<AlertRecord | null>(null);
  const [detailOpen, setDetailOpen] = useState(false);
  const [noteDialogOpen, setNoteDialogOpen] = useState(false);
  const [noteText, setNoteText] = useState("");

  // 筛选
  const [filterLevel, setFilterLevel] = useState<string>("all");
  const [filterStatus, setFilterStatus] = useState<string>("all");
  const [searchText, setSearchText] = useState("");
  const [activeTab, setActiveTab] = useState<"active" | "all">("active");

  const loadData = useCallback(async () => {
    setLoading(true);
    try {
      const [statsData, alertsData] = await Promise.all([
        inspectionAlertApi.getStats(),
        activeTab === "active"
          ? inspectionAlertApi.getActive()
          : inspectionAlertApi.list({ limit: 200 }),
      ]);
      setStats(statsData);
      setAlerts(alertsData);
    } catch (e: any) {
      console.error("[AlertCenter] 加载失败:", e);
    } finally {
      setLoading(false);
    }
  }, [activeTab]);

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

  // 筛选后的数据
  const filteredAlerts = (alerts ?? []).filter((a) => {
    if (filterLevel !== "all" && a.level !== filterLevel) return false;
    if (filterStatus !== "all" && a.status !== filterStatus) return false;
    if (searchText) {
      const s = searchText.toLowerCase();
      if (
        !a.device_name.toLowerCase().includes(s) &&
        !a.rule_name.toLowerCase().includes(s) &&
        !a.message.toLowerCase().includes(s)
      )
        return false;
    }
    return true;
  });

  const handleViewDetail = (alert: AlertRecord) => {
    setSelectedAlert(alert);
    setDetailOpen(true);
  };

  const handleAcknowledge = async () => {
    if (!selectedAlert) return;
    try {
      await inspectionAlertApi.acknowledge(selectedAlert.id, "operator");
      toast.success("已确认告警");
      setDetailOpen(false);
      loadData();
    } catch (e: any) {
      toast.error("操作失败");
    }
  };

  const handleResolve = async () => {
    if (!selectedAlert) return;
    try {
      await inspectionAlertApi.resolve(selectedAlert.id, "manual", "operator");
      toast.success("已恢复告警");
      setDetailOpen(false);
      loadData();
    } catch (e: any) {
      toast.error("操作失败");
    }
  };

  const handleClose = () => {
    if (!selectedAlert) return;
    setNoteText("");
    setNoteDialogOpen(true);
  };

  const handleCloseConfirm = async () => {
    if (!selectedAlert) return;
    try {
      await inspectionAlertApi.close(selectedAlert.id, noteText);
      toast.success("已关闭告警");
      setNoteDialogOpen(false);
      setDetailOpen(false);
      loadData();
    } catch (e: any) {
      toast.error("操作失败");
    }
  };

  const formatTime = (ts: number) => {
    return new Date(ts).toLocaleString();
  };

  const getTimeAgo = (ts: number) => {
    const diff = Date.now() - ts;
    const mins = Math.floor(diff / 60000);
    if (mins < 1) return "刚刚";
    if (mins < 60) return `${mins} 分钟前`;
    const hours = Math.floor(mins / 60);
    if (hours < 24) return `${hours} 小时前`;
    const days = Math.floor(hours / 24);
    return `${days} 天前`;
  };

  return (
    <div className="h-full flex flex-col">
      {/* 顶部统计 */}
      <div className="px-6 py-4 border-b border-border/60">
        <div className="flex items-center justify-between mb-4">
          <div className="flex items-center gap-3">
            <div className="w-9 h-9 rounded-lg bg-red-500/10 flex items-center justify-center">
              <Bell size={18} className="text-red-500" />
            </div>
            <div>
              <h2 className="text-lg font-semibold">告警中心</h2>
              <p className="text-sm text-muted-foreground">
                监控设备巡检产生的告警
              </p>
            </div>
          </div>
          <Button variant="outline" size="sm" onClick={loadData}>
            <RefreshCw size={14} className="mr-2" />
            刷新
          </Button>
        </div>

        {/* 统计卡片 */}
        <div className="grid grid-cols-4 gap-3">
          <div className="p-3 rounded-lg border border-red-500/30 bg-red-500/5">
            <div className="flex items-center gap-2">
              <AlertOctagon size={16} className="text-red-500" />
              <span className="text-sm text-muted-foreground">严重告警</span>
            </div>
            <div className="text-2xl font-bold text-red-500 mt-1">
              {stats?.active_critical ?? 0}
            </div>
          </div>
          <div className="p-3 rounded-lg border border-orange-500/30 bg-orange-500/5">
            <div className="flex items-center gap-2">
              <AlertTriangle size={16} className="text-orange-500" />
              <span className="text-sm text-muted-foreground">警告</span>
            </div>
            <div className="text-2xl font-bold text-orange-500 mt-1">
              {stats?.active_warning ?? 0}
            </div>
          </div>
          <div className="p-3 rounded-lg border border-blue-500/30 bg-blue-500/5">
            <div className="flex items-center gap-2">
              <Info size={16} className="text-blue-500" />
              <span className="text-sm text-muted-foreground">提示</span>
            </div>
            <div className="text-2xl font-bold text-blue-500 mt-1">
              {stats?.active_info ?? 0}
            </div>
          </div>
          <div className="p-3 rounded-lg border border-green-500/30 bg-green-500/5">
            <div className="flex items-center gap-2">
              <CheckCircle size={16} className="text-green-500" />
              <span className="text-sm text-muted-foreground">已恢复</span>
            </div>
            <div className="text-2xl font-bold text-green-500 mt-1">
              {stats?.resolved ?? 0}
            </div>
          </div>
        </div>
      </div>

      {/* 筛选栏 */}
      <div className="flex items-center gap-3 px-6 py-3 border-b border-border/60">
        <div className="flex bg-secondary/50 rounded-md p-0.5">
          <button
            onClick={() => setActiveTab("active")}
            className={`px-3 py-1.5 text-sm rounded-md transition-colors ${
              activeTab === "active"
                ? "bg-background shadow-sm font-medium"
                : "text-muted-foreground hover:text-foreground"
            }`}
          >
            待处理
            {stats && stats.active > 0 && (
              <Badge className="ml-2" variant="secondary">
                {stats.active}
              </Badge>
            )}
          </button>
          <button
            onClick={() => setActiveTab("all")}
            className={`px-3 py-1.5 text-sm rounded-md transition-colors ${
              activeTab === "all"
                ? "bg-background shadow-sm font-medium"
                : "text-muted-foreground hover:text-foreground"
            }`}
          >
            全部
          </button>
        </div>

        <div className="flex-1" />

        <Select value={filterLevel} onValueChange={setFilterLevel}>
          <SelectTrigger className="w-32">
            <SelectValue placeholder="级别" />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="all">全部级别</SelectItem>
            <SelectItem value="critical">严重</SelectItem>
            <SelectItem value="warning">警告</SelectItem>
            <SelectItem value="info">提示</SelectItem>
          </SelectContent>
        </Select>

        {activeTab === "all" && (
          <Select value={filterStatus} onValueChange={setFilterStatus}>
            <SelectTrigger className="w-32">
              <SelectValue placeholder="状态" />
            </SelectTrigger>
            <SelectContent>
              <SelectItem value="all">全部状态</SelectItem>
              <SelectItem value="active">待处理</SelectItem>
              <SelectItem value="acknowledged">已确认</SelectItem>
              <SelectItem value="resolved">已恢复</SelectItem>
              <SelectItem value="closed">已关闭</SelectItem>
            </SelectContent>
          </Select>
        )}

        <Input
          placeholder="搜索设备/规则..."
          value={searchText}
          onChange={(e) => setSearchText(e.target.value)}
          className="w-48"
        />
      </div>

      {/* 告警列表 */}
      <div className="flex-1 overflow-auto">
        {loading ? (
          <div className="text-center text-muted-foreground py-12">加载中...</div>
        ) : filteredAlerts.length === 0 ? (
          <div className="text-center text-muted-foreground py-16">
            <CheckCircle size={40} className="mx-auto mb-3 text-green-500 opacity-40" />
            <p className="text-sm">暂无告警记录</p>
            <p className="text-xs text-muted-foreground mt-1">
              {activeTab === "active" ? "所有设备运行正常" : "还没有产生过告警"}
            </p>
          </div>
        ) : (
          <div className="divide-y divide-border/60">
            {filteredAlerts.map((alert) => {
              const colors = LEVEL_COLORS[alert.level];
              return (
                <div
                  key={alert.id}
                  onClick={() => handleViewDetail(alert)}
                  className="flex items-center gap-4 px-6 py-3 hover:bg-accent/30 cursor-pointer transition-colors"
                >
                  {/* 级别指示点 */}
                  <div className={`w-2 h-2 rounded-full ${colors.dot}`} />

                  {/* 主要内容 */}
                  <div className="flex-1 min-w-0">
                    <div className="flex items-center gap-2 mb-0.5">
                      <span className="font-medium truncate">{alert.device_name}</span>
                      <Badge
                        variant="outline"
                        className={`${colors.bg} ${colors.text} ${colors.border} border`}
                      >
                        {LEVEL_LABELS[alert.level]}
                      </Badge>
                      <span className={`text-xs ${STATUS_COLORS[alert.status]}`}>
                        {STATUS_LABELS[alert.status]}
                      </span>
                    </div>
                    <div className="text-sm text-muted-foreground truncate">
                      {alert.rule_name} — {alert.message}
                    </div>
                  </div>

                  {/* 时间 */}
                  <div className="text-right shrink-0">
                    <div className="text-sm text-muted-foreground">
                      {getTimeAgo(alert.triggered_at)}
                    </div>
                    <div className="text-xs text-muted-foreground/60">
                      {formatTime(alert.triggered_at)}
                    </div>
                  </div>

                  <ChevronRight size={16} className="text-muted-foreground shrink-0" />
                </div>
              );
            })}
          </div>
        )}
      </div>

      {/* 详情弹窗 */}
      <Dialog open={detailOpen} onOpenChange={setDetailOpen}>
        <DialogContent className="max-w-lg">
          {selectedAlert && (
            <>
              <DialogHeader>
                <DialogTitle className="flex items-center gap-2">
                  <div
                    className={`w-2 h-2 rounded-full ${LEVEL_COLORS[selectedAlert.level].dot}`}
                  />
                  告警详情
                </DialogTitle>
              </DialogHeader>

              <div className="space-y-4 py-2">
                <div className="grid grid-cols-2 gap-4">
                  <div>
                    <div className="text-xs text-muted-foreground mb-1">设备名称</div>
                    <div className="text-sm font-medium">{selectedAlert.device_name}</div>
                  </div>
                  <div>
                    <div className="text-xs text-muted-foreground mb-1">告警级别</div>
                    <Badge
                      variant="outline"
                      className={`${LEVEL_COLORS[selectedAlert.level].bg} ${
                        LEVEL_COLORS[selectedAlert.level].text
                      } ${LEVEL_COLORS[selectedAlert.level].border} border`}
                    >
                      {LEVEL_LABELS[selectedAlert.level]}
                    </Badge>
                  </div>
                </div>

                <div>
                  <div className="text-xs text-muted-foreground mb-1">规则名称</div>
                  <div className="text-sm">{selectedAlert.rule_name}</div>
                </div>

                <div>
                  <div className="text-xs text-muted-foreground mb-1">告警消息</div>
                  <div className="text-sm p-2 bg-secondary/30 rounded-md">
                    {selectedAlert.message}
                  </div>
                </div>

                <div className="grid grid-cols-2 gap-4">
                  <div>
                    <div className="text-xs text-muted-foreground mb-1">当前值</div>
                    <div className="text-sm font-mono">{selectedAlert.metric_value}</div>
                  </div>
                  <div>
                    <div className="text-xs text-muted-foreground mb-1">阈值</div>
                    <div className="text-sm font-mono">{selectedAlert.threshold}</div>
                  </div>
                </div>

                <div>
                  <div className="text-xs text-muted-foreground mb-1">触发时间</div>
                  <div className="text-sm">{formatTime(selectedAlert.triggered_at)}</div>
                </div>

                <div>
                  <div className="text-xs text-muted-foreground mb-1">当前状态</div>
                  <div className={`text-sm font-medium ${STATUS_COLORS[selectedAlert.status]}`}>
                    {STATUS_LABELS[selectedAlert.status]}
                  </div>
                </div>

                {selectedAlert.note && (
                  <div>
                    <div className="text-xs text-muted-foreground mb-1">备注</div>
                    <div className="text-sm text-muted-foreground">{selectedAlert.note}</div>
                  </div>
                )}
              </div>

              <DialogFooter className="flex justify-between">
                <Button variant="outline" onClick={() => setDetailOpen(false)}>
                  关闭
                </Button>
                <div className="flex gap-2">
                  {selectedAlert.status === "active" && (
                    <Button variant="outline" onClick={handleAcknowledge}>
                      <MessageSquare size={14} className="mr-2" />
                      确认
                    </Button>
                  )}
                  {(selectedAlert.status === "active" ||
                    selectedAlert.status === "acknowledged") && (
                    <Button variant="outline" onClick={handleResolve}>
                      <CheckCircle size={14} className="mr-2" />
                      恢复
                    </Button>
                  )}
                  {selectedAlert.status !== "closed" && (
                    <Button variant="destructive" onClick={handleClose}>
                      <XCircle size={14} className="mr-2" />
                      关闭
                    </Button>
                  )}
                </div>
              </DialogFooter>
            </>
          )}
        </DialogContent>
      </Dialog>

      {/* 关闭备注弹窗 */}
      <Dialog open={noteDialogOpen} onOpenChange={setNoteDialogOpen}>
        <DialogContent className="max-w-md">
          <DialogHeader>
            <DialogTitle>关闭告警</DialogTitle>
          </DialogHeader>
          <div className="space-y-3 py-2">
            <Label>关闭原因（可选）</Label>
            <Textarea
              placeholder="请输入关闭原因或处理备注..."
              value={noteText}
              onChange={(e) => setNoteText(e.target.value)}
              rows={3}
            />
          </div>
          <DialogFooter>
            <Button variant="outline" onClick={() => setNoteDialogOpen(false)}>
              取消
            </Button>
            <Button variant="destructive" onClick={handleCloseConfirm}>
              确认关闭
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}

export default AlertCenterPage;