// 站点拨测 — 任务列表 + 详情页可观测 // Logan.Li
import { useState, useEffect, useCallback, useMemo } from 'react';
import { useSearchParams } from 'react-router-dom';
import { Card, CardContent } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
import { Switch } from '@/components/ui/switch';
import { Badge } from '@/components/ui/badge';
import {
  Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle,
} from '@/components/ui/dialog';
import {
  Table, TableBody, TableCell, TableHead, TableHeader, TableRow,
} from '@/components/ui/table';
import {
  Plus, Trash2, Pencil, Loader2, RefreshCw, Activity, ShieldAlert, LineChart,
} from 'lucide-react';
import { toast } from 'sonner';
import { siteApi } from '@/api';
import { useConfirm } from '@/components/ui/confirm-dialog';
import type { JsonData } from '@/types/common';
import { SiteProtocolPieChart } from './site-monitor/SiteProtocolPieChart';
import { SiteTaskDetailPage } from './site-monitor/SiteTaskDetailPage';
import {
  PROBE_TYPE_OPTIONS, type ProbeType, type SiteStats, type SiteTask,
  probeTypeMeta, probeFrequencyHint, defaultProbeFrequency, MIN_PROBE_FREQUENCY, fmtAvailResponse, fmtFrequency,
  isSslProbeTask, isSslExpiringSoon, normalizeProbeType,
} from './site-monitor/helpers';

interface CreateTaskForm {
  name: string; url: string; type: ProbeType;
  frequency_sec: number; timeout_sec: number; expected_status_code: number;
}

const emptyForm: CreateTaskForm = {
  name: '', url: '', type: 'HTTP',
  frequency_sec: defaultProbeFrequency('HTTP'), timeout_sec: 10, expected_status_code: 200,
};

const FILTER_TYPES: Array<ProbeType | 'ALL'> = ['ALL', ...PROBE_TYPE_OPTIONS];

function alertStatusBadge(status?: string) {
  if (status === 'alerting') {
    return <Badge className="bg-red-500/15 dg-text-red border-red-500/30 text-[10px]">告警中</Badge>;
  }
  return <Badge className="bg-emerald-500/15 dg-text-green border-emerald-500/30 text-[10px]">正常</Badge>;
}

export function SiteMonitor() {
  const [searchParams, setSearchParams] = useSearchParams();
  const taskIdParam = searchParams.get('task');
  const [stats, setStats] = useState<SiteStats | null>(null);
  const [tasks, setTasks] = useState<SiteTask[]>([]);
  const [initialLoading, setInitialLoading] = useState(true);
  const [refreshing, setRefreshing] = useState(false);
  const [formOpen, setFormOpen] = useState(false);
  const [editingTaskId, setEditingTaskId] = useState<number | null>(null);
  const [form, setForm] = useState<CreateTaskForm>({ ...emptyForm });
  const [saving, setSaving] = useState(false);
  const [selectedType, setSelectedType] = useState<ProbeType | 'ALL'>('ALL');
  const _confirm = useConfirm();

  const detailTask = useMemo(() => {
    if (!taskIdParam) return null;
    const id = Number(taskIdParam);
    if (!Number.isFinite(id)) return null;
    return tasks.find((t) => t.id === id) || null;
  }, [taskIdParam, tasks]);

  const loadStats = useCallback(async () => {
    try { setStats(await siteApi.getStats() as SiteStats); } catch { /* ignore */ }
  }, []);

  const loadTasks = useCallback(async () => {
    setRefreshing(true);
    try {
      const data = await siteApi.getTasks();
      const list = (data as JsonData)?.list as SiteTask[] || [];
      setTasks(list);
    } catch { /* ignore */ } finally {
      setRefreshing(false);
      setInitialLoading(false);
    }
  }, []);

  useEffect(() => { loadStats(); loadTasks(); }, [loadStats, loadTasks]);

  // 30s 静默刷新 // Logan.Li
  useEffect(() => {
    if (initialLoading && tasks.length === 0) return;
    const timer = setInterval(() => { loadStats(); loadTasks(); }, 30_000);
    return () => clearInterval(timer);
  }, [loadStats, loadTasks, initialLoading, tasks.length]);

  const typeCounts = useMemo(() => {
    const counts: Record<string, number> = {};
    for (const t of PROBE_TYPE_OPTIONS) counts[t] = 0;
    for (const t of tasks) {
      const key = normalizeProbeType(t.type);
      counts[key]++;
    }
    return counts;
  }, [tasks]);

  const filteredTasks = selectedType === 'ALL'
    ? tasks
    : tasks.filter((t) => normalizeProbeType(t.type) === selectedType);

  const openCreate = (type?: ProbeType) => {
    setEditingTaskId(null);
    const t = type || (selectedType !== 'ALL' ? selectedType : 'HTTP');
    setForm({ ...emptyForm, type: t, frequency_sec: defaultProbeFrequency(t) });
    setFormOpen(true);
  };

  const openEdit = (task: SiteTask) => {
    setEditingTaskId(task.id);
    setForm({
      name: task.name, url: task.url,
      type: normalizeProbeType(task.type),
      frequency_sec: task.frequency_sec || 60,
      timeout_sec: task.timeout_sec || 10,
      expected_status_code: task.expected_status_code || 200,
    });
    setFormOpen(true);
  };

  const openDetail = (task: SiteTask) => {
    setSearchParams({ tab: 'site', task: String(task.id) });
  };

  const closeDetail = () => {
    setSearchParams({ tab: 'site' });
  };

  const handleSave = async () => {
    if (!form.name.trim() || !form.url.trim()) { toast.error('名称和地址不能为空'); return; }
    setSaving(true);
    const payload = {
      name: form.name.trim(), url: form.url.trim(), type: form.type.toLowerCase(),
      frequency_sec: Number(form.frequency_sec) || 60,
      timeout_sec: Number(form.timeout_sec) || 10,
      expected_status_code: Number(form.expected_status_code) || 200,
    };
    try {
      if (editingTaskId) { await siteApi.updateTask(editingTaskId, payload); toast.success('任务已更新'); }
      else { await siteApi.createTask(payload); toast.success('拨测任务已创建'); }
      setFormOpen(false); setEditingTaskId(null);
      loadTasks(); loadStats();
    } catch (e) {
      toast.error((e as JsonData).message || (editingTaskId ? '更新失败' : '创建失败'));
    } finally { setSaving(false); }
  };

  const handleDelete = async (task: SiteTask) => {
    const ok = await _confirm({ title: '删除拨测任务', description: `确定删除「${task.name}」吗？`, variant: 'destructive' });
    if (!ok) return;
    try {
      await siteApi.deleteTask(task.id);
      if (taskIdParam === String(task.id)) {
        closeDetail();
      }
      toast.success('任务已删除');
      loadTasks(); loadStats();
    } catch (e) { toast.error((e as JsonData).message || '删除失败'); }
  };

  const handleToggle = async (task: SiteTask) => {
    try {
      await siteApi.toggleTask(task.id, !task.enabled);
      toast.success(task.enabled ? '已停用' : '已启用');
      loadTasks(); loadStats();
    } catch (e) { toast.error((e as JsonData).message || '操作失败'); }
  };

  const targetMeta = probeTypeMeta[form.type];
  const availStr = stats?.availability != null ? `${(stats.availability * 100).toFixed(1)}%` : '--';
  const probeCountStr = stats?.probe_count != null ? String(stats.probe_count) : '--';

  if (initialLoading) {
    return (
      <div className="flex items-center justify-center py-20">
        <Loader2 className="h-8 w-8 animate-spin text-[var(--dg-text-muted)]" />
      </div>
    );
  }

  if (taskIdParam) {
    if (!detailTask) {
      return (
        <div className="space-y-4 text-center py-16">
          <p className="text-sm text-[var(--dg-text-muted)]">拨测任务不存在或已删除</p>
          <Button variant="outline" size="sm" onClick={closeDetail}>返回列表</Button>
        </div>
      );
    }
    return (
      <SiteTaskDetailPage
        task={detailTask}
        onBack={closeDetail}
        onProbed={() => { loadTasks(); loadStats(); }}
      />
    );
  }

  return (
    <div className="space-y-4">
      <div className="flex items-center justify-between flex-wrap gap-2">
        <div>
          <h2 className="text-lg font-semibold">站点拨测</h2>
          <p className="text-xs text-[var(--dg-text-muted)]">HTTP Web 拨测 · SSL 证书检测 · TCP / DNS / PING</p>
        </div>
        <div className="flex gap-2">
          <Button size="sm" variant="outline" className="h-8" onClick={() => { loadStats(); loadTasks(); }} disabled={refreshing}>
            <RefreshCw className={`h-3.5 w-3.5 mr-1 ${refreshing ? 'animate-spin' : ''}`} />刷新
          </Button>
          <Button size="sm" className="h-8 gap-1.5" onClick={() => openCreate()}>
            <Plus className="h-3.5 w-3.5" />添加任务
          </Button>
        </div>
      </div>

      <div className="grid grid-cols-1 xl:grid-cols-12 gap-4 items-start">
        <div className="xl:col-span-8 space-y-4">
          <div className="grid grid-cols-2 md:grid-cols-5 gap-2">
            {[
              { label: '总任务', value: stats?.total_tasks ?? '--' },
              { label: '正常', value: stats?.up_count ?? '--', color: 'dg-text-green' },
              { label: '异常', value: stats?.down_count ?? '--', color: 'dg-text-red' },
              { label: '可用率(24h)', value: availStr, color: 'dg-text-blue' },
              { label: '探测次数', value: probeCountStr },
            ].map((item) => (
              <div key={item.label} className="rounded-lg border border-[var(--dg-border)] bg-[var(--dg-bg-secondary)] px-3 py-2 text-center">
                <p className="text-[10px] text-[var(--dg-text-muted)]">{item.label}</p>
                <p className={`text-base font-bold ${item.color || 'text-[var(--dg-text-primary)]'}`}>{item.value}</p>
              </div>
            ))}
          </div>

          <Card className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)]">
            <CardContent className="p-3">
              <div className="flex items-center justify-between mb-3 flex-wrap gap-2">
                <div className="flex items-center gap-2">
                  <Activity className="h-4 w-4 text-[var(--dg-text-muted)]" />
                  <h3 className="text-sm font-medium">拨测任务</h3>
                  <span className="text-[10px] text-[var(--dg-text-muted)]">点击可观测进入详情页</span>
                </div>
                <div className="flex flex-wrap gap-1">
                  {FILTER_TYPES.map((type) => {
                    const count = type === 'ALL' ? tasks.length : typeCounts[type] || 0;
                    const active = selectedType === type;
                    return (
                      <button
                        key={type}
                        type="button"
                        onClick={() => setSelectedType(type)}
                        className={`px-2 py-0.5 rounded text-[10px] font-medium transition-colors ${
                          active
                            ? 'bg-[var(--dg-blue)]/15 text-[var(--dg-blue)] border border-[var(--dg-blue)]/30'
                            : 'bg-[var(--dg-bg-tertiary)] text-[var(--dg-text-muted)] border border-transparent hover:text-[var(--dg-text-primary)]'
                        }`}
                      >
                        {type === 'ALL' ? '全部' : type} {count > 0 && count}
                      </button>
                    );
                  })}
                </div>
              </div>

              {filteredTasks.length === 0 ? (
                <div className="text-center py-10 text-sm text-[var(--dg-text-muted)]">
                  {tasks.length === 0 ? '暂无拨测任务' : '当前筛选无任务'}
                </div>
              ) : (
                <div className="overflow-x-auto">
                  <Table>
                    <TableHeader>
                      <TableRow className="border-[var(--dg-border)] hover:bg-transparent">
                        <TableHead className="text-xs">名称</TableHead>
                        <TableHead className="text-xs">类型</TableHead>
                        <TableHead className="text-xs">频率</TableHead>
                        <TableHead className="text-xs">报警状态</TableHead>
                        <TableHead className="text-xs">可用率/响应时间</TableHead>
                        <TableHead className="text-xs">启用</TableHead>
                        <TableHead className="text-xs w-24" />
                      </TableRow>
                    </TableHeader>
                    <TableBody>
                      {filteredTasks.map((task) => (
                        <TableRow
                          key={task.id}
                          className="border-[var(--dg-border)] hover:bg-[var(--dg-bg-tertiary)]/60"
                        >
                          <TableCell className="py-2">
                            <div className="min-w-0">
                              <div className="flex items-center gap-1.5">
                                <span className="text-sm font-medium truncate">{task.name}</span>
                                {isSslProbeTask(task) && isSslExpiringSoon(task.ssl_days_remaining) && (
                                  <Badge className="bg-amber-500/15 dg-text-yellow border-amber-500/30 text-[10px] shrink-0 gap-0.5">
                                    <ShieldAlert className="h-3 w-3" />证书
                                  </Badge>
                                )}
                              </div>
                              <p className="text-[10px] text-[var(--dg-text-muted)] truncate max-w-[220px]">{task.url}</p>
                            </div>
                          </TableCell>
                          <TableCell className="py-2">
                            <Badge variant="outline" className="text-[10px]">{normalizeProbeType(task.type)}</Badge>
                          </TableCell>
                          <TableCell className="text-xs text-[var(--dg-text-muted)] py-2">{fmtFrequency(task.frequency_sec)}</TableCell>
                          <TableCell className="py-2">{alertStatusBadge(task.alert_status)}</TableCell>
                          <TableCell className="text-xs font-mono py-2">{fmtAvailResponse(task)}</TableCell>
                          <TableCell className="py-2" onClick={(e) => e.stopPropagation()}>
                            <Switch checked={task.enabled} onCheckedChange={() => handleToggle(task)} />
                          </TableCell>
                          <TableCell className="py-2">
                            <div className="flex items-center justify-end gap-0.5">
                              <Button variant="outline" size="sm" className="h-7 text-xs" onClick={() => openDetail(task)}>
                                <LineChart className="h-3 w-3 mr-1" />可观测
                              </Button>
                              <Button variant="ghost" size="icon-sm" onClick={() => openEdit(task)}><Pencil className="h-3.5 w-3.5" /></Button>
                              <Button variant="ghost" size="icon-sm" className="dg-text-red" onClick={() => handleDelete(task)}><Trash2 className="h-3.5 w-3.5" /></Button>
                            </div>
                          </TableCell>
                        </TableRow>
                      ))}
                    </TableBody>
                  </Table>
                </div>
              )}
            </CardContent>
          </Card>
        </div>

        <div className="xl:col-span-4">
          <SiteProtocolPieChart tasks={tasks} />
        </div>
      </div>

      <Dialog open={formOpen} onOpenChange={(open) => { setFormOpen(open); if (!open) setEditingTaskId(null); }}>
        <DialogContent className="sm:max-w-md bg-[var(--dg-bg-secondary)] border-[var(--dg-border)]">
          <DialogHeader>
            <DialogTitle>{editingTaskId ? '编辑拨测任务' : '添加拨测任务'}</DialogTitle>
            <DialogDescription className="text-[var(--dg-text-muted)]">按协议类型配置探活任务，系统将按间隔自动拨测</DialogDescription>
          </DialogHeader>
          <div className="grid gap-4 py-2">
            <div className="grid gap-1.5">
              <Label>任务名称</Label>
              <Input placeholder="例如：官网首页" value={form.name} onChange={(e) => setForm({ ...form, name: e.target.value })} />
            </div>
            <div className="grid gap-1.5">
              <Label>协议类型</Label>
              <Select value={form.type} onValueChange={(v) => {
                const t = v as ProbeType;
                setForm({ ...form, type: t, frequency_sec: editingTaskId ? form.frequency_sec : defaultProbeFrequency(t) });
              }}>
                <SelectTrigger><SelectValue /></SelectTrigger>
                <SelectContent>
                  {PROBE_TYPE_OPTIONS.map((t) => <SelectItem key={t} value={t}>{t}</SelectItem>)}
                </SelectContent>
              </Select>
              <p className="text-[10px] text-[var(--dg-text-muted)]">{targetMeta.hint}</p>
            </div>
            <div className="grid gap-1.5">
              <Label>{targetMeta.label}</Label>
              <Input placeholder={targetMeta.placeholder} value={form.url} onChange={(e) => setForm({ ...form, url: e.target.value })} />
            </div>
            <div className="grid grid-cols-2 gap-3">
              <div className="grid gap-1.5">
                <Label>检测间隔 (秒)</Label>
                <Input type="number" min={MIN_PROBE_FREQUENCY[form.type]} max={86400} value={form.frequency_sec}
                  onChange={(e) => setForm({ ...form, frequency_sec: Number(e.target.value) || defaultProbeFrequency(form.type) })} />
                <p className="text-[10px] text-[var(--dg-text-muted)]">{probeFrequencyHint(form.type)}</p>
              </div>
              <div className="grid gap-1.5">
                <Label>超时 (秒)</Label>
                <Input type="number" min={1} max={300} value={form.timeout_sec}
                  onChange={(e) => setForm({ ...form, timeout_sec: Number(e.target.value) || 10 })} />
              </div>
            </div>
            {form.type === 'HTTP' && (
              <div className="grid gap-1.5">
                <Label>期望状态码</Label>
                <Input type="number" min={100} max={599} value={form.expected_status_code}
                  onChange={(e) => setForm({ ...form, expected_status_code: Number(e.target.value) || 200 })} />
              </div>
            )}
          </div>
          <DialogFooter>
            <Button variant="outline" onClick={() => { setFormOpen(false); setEditingTaskId(null); }} disabled={saving}>取消</Button>
            <Button onClick={handleSave} disabled={saving}>
              {saving && <Loader2 className="h-4 w-4 animate-spin mr-1" />}
              {editingTaskId ? '保存' : '创建任务'}
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}