import { useState, useEffect } from 'react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Card, CardContent } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import {
  Plus,
  Search,
  Edit2,
  Trash2,
  Globe,
  CheckCircle2,
  XCircle,
  Clock,
  RefreshCw,
  Loader2,
} from 'lucide-react';
import { cloudApi } from '@/services/api';

export function DomainManager() {
  const [domains, setDomains] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);
  const [searchQuery, setSearchQuery] = useState('');
  const [selectedStatus, setSelectedStatus] = useState<string>('all');

  // 创建/编辑域名表单状态
  const [formOpen, setFormOpen] = useState(false);
  const [submitting, setSubmitting] = useState(false);
  const [editingDomain, setEditingDomain] = useState<any>(null);
  const [formData, setFormData] = useState({
    name: '',
    registrar: '',
    status: 'active',
    expire_date: '',
    dns_provider: '',
    record_count: '',
    ssl_enabled: false,
    ssl_expire_date: '',
  });

  const resetForm = () => {
    setEditingDomain(null);
    setFormData({
      name: '',
      registrar: '',
      status: 'active',
      expire_date: '',
      dns_provider: '',
      record_count: '',
      ssl_enabled: false,
      ssl_expire_date: '',
    });
  };

  const handleOpenCreate = () => {
    resetForm();
    setFormOpen(true);
  };

  const handleOpenEdit = (domain: any) => {
    setEditingDomain(domain);
    // 后端返回 RFC3339 时间，截取 YYYY-MM-DD 部分给 date input
    const toDateInput = (v: string) => (v ? v.substring(0, 10) : '');
    setFormData({
      name: domain.name || '',
      registrar: domain.registrar || '',
      status: domain.status || 'active',
      expire_date: toDateInput(domain.expire_date || ''),
      dns_provider: domain.dns_provider || domain.dnsProvider || '',
      record_count: String(domain.record_count ?? domain.recordCount ?? ''),
      ssl_enabled: domain.ssl_enabled ?? domain.sslEnabled ?? false,
      ssl_expire_date: toDateInput(domain.ssl_expire_date || ''),
    });
    setFormOpen(true);
  };

  const handleSubmit = async () => {
    if (!formData.name.trim()) return;
    try {
      setSubmitting(true);
      const payload: any = {
        name: formData.name.trim(),
        registrar: formData.registrar.trim(),
        status: formData.status,
        expire_date: formData.expire_date,
        dns_provider: formData.dns_provider.trim(),
        record_count: Number(formData.record_count) || 0,
        ssl_enabled: formData.ssl_enabled,
        ssl_expire_date: formData.ssl_expire_date,
      };
      if (editingDomain) {
        await cloudApi.updateDomain(editingDomain.id, payload);
      } else {
        await cloudApi.createDomain(payload);
      }
      setFormOpen(false);
      loadData();
    } catch (e) {
      console.error(editingDomain ? '更新域名失败:' : '创建域名失败:', e);
    } finally {
      setSubmitting(false);
    }
  };

  const loadData = async () => {
    try {
      setLoading(true);
      const res: any = await cloudApi.getDomains();
      setDomains(res?.list || []);
    } catch (e) {
      console.error('加载域名列表失败:', e);
      setDomains([]);
    } finally {
      setLoading(false);
    }
  };

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

  const handleDelete = async (id: string) => {
    try {
      await cloudApi.deleteDomain(id);
      loadData();
    } catch (e) {
      console.error('删除域名失败:', e);
    }
  };

  const filteredDomains = domains.filter(domain => {
    const matchesSearch = (domain.name || '').toLowerCase().includes(searchQuery.toLowerCase()) ||
                         (domain.registrar || '').toLowerCase().includes(searchQuery.toLowerCase());
    const matchesStatus = selectedStatus === 'all' || domain.status === selectedStatus;
    return matchesSearch && matchesStatus;
  });

  const stats = {
    total: domains.length,
    active: domains.filter(d => d.status === 'active').length,
    expired: domains.filter(d => d.status === 'expired').length,
    pending: domains.filter(d => d.status === 'pending').length,
    sslEnabled: domains.filter(d => d.ssl_enabled || d.sslEnabled).length,
  };

  const getDaysUntilExpiry = (expireDate: string) => {
    if (!expireDate) return Infinity;
    const days = Math.ceil((new Date(expireDate).getTime() - Date.now()) / (1000 * 60 * 60 * 24));
    return days;
  };

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-slate-100">域名管理</h1>
          <p className="text-slate-400 mt-1">管理域名注册信息和DNS解析记录</p>
        </div>
        <div className="flex items-center gap-2">
          <Button variant="outline" onClick={loadData} className="border-slate-700 text-slate-300">
            <RefreshCw className={`h-4 w-4 mr-2 ${loading ? 'animate-spin' : ''}`} />
            刷新
          </Button>
          <Button className="bg-blue-600 hover:bg-blue-700" onClick={handleOpenCreate}>
            <Plus className="h-4 w-4 mr-2" />
            添加域名
          </Button>
        </div>
      </div>

      {/* Stats */}
      <div className="grid grid-cols-5 gap-4">
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-slate-400 text-sm">域名总数</p>
                <p className="text-2xl font-bold text-slate-100 mt-1">{stats.total}</p>
              </div>
              <div className="w-10 h-10 rounded-lg bg-blue-500/20 flex items-center justify-center">
                <Globe className="h-5 w-5 text-blue-400" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-slate-400 text-sm">正常</p>
                <p className="text-2xl font-bold text-green-400 mt-1">{stats.active}</p>
              </div>
              <div className="w-10 h-10 rounded-lg bg-green-500/20 flex items-center justify-center">
                <CheckCircle2 className="h-5 w-5 text-green-400" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-slate-400 text-sm">已过期</p>
                <p className="text-2xl font-bold text-red-400 mt-1">{stats.expired}</p>
              </div>
              <div className="w-10 h-10 rounded-lg bg-red-500/20 flex items-center justify-center">
                <XCircle className="h-5 w-5 text-red-400" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-slate-400 text-sm">待审核</p>
                <p className="text-2xl font-bold text-yellow-400 mt-1">{stats.pending}</p>
              </div>
              <div className="w-10 h-10 rounded-lg bg-yellow-500/20 flex items-center justify-center">
                <Clock className="h-5 w-5 text-yellow-400" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-slate-400 text-sm">SSL证书</p>
                <p className="text-2xl font-bold text-cyan-400 mt-1">{stats.sslEnabled}</p>
              </div>
              <div className="w-10 h-10 rounded-lg bg-cyan-500/20 flex items-center justify-center">
                <CheckCircle2 className="h-5 w-5 text-cyan-400" />
              </div>
            </div>
          </CardContent>
        </Card>
      </div>

      {/* Filters */}
      <div className="flex items-center gap-4">
        <div className="relative flex-1 max-w-md">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-slate-400" />
          <Input
            placeholder="搜索域名..."
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            className="pl-10 bg-slate-800 border-slate-700 text-slate-100"
          />
        </div>
        <select
          value={selectedStatus}
          onChange={(e) => setSelectedStatus(e.target.value)}
          className="px-3 py-2 bg-slate-800 border border-slate-700 rounded-md text-slate-100 text-sm"
        >
          <option value="all">全部状态</option>
          <option value="active">正常</option>
          <option value="expired">已过期</option>
          <option value="pending">待审核</option>
        </select>
      </div>

      {/* Domain List */}
      {loading ? (
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-12 text-center text-slate-500">
            <RefreshCw className="h-6 w-6 animate-spin mx-auto mb-3" />
            加载中...
          </CardContent>
        </Card>
      ) : filteredDomains.length === 0 ? (
        <Card className="bg-slate-800 border-slate-700">
          <CardContent className="p-12 text-center text-slate-500">暂无域名数据</CardContent>
        </Card>
      ) : (
        <div className="space-y-3">
          {filteredDomains.map((domain) => {
            const sslEnabled = domain.ssl_enabled || domain.sslEnabled;
            const expireDate = domain.expire_date || domain.expireDate || '';
            const sslExpireDate = domain.ssl_expire_date || domain.sslExpireDate || '';
            const daysUntilExpiry = getDaysUntilExpiry(expireDate);
            return (
              <Card key={domain.id} className="bg-slate-800 border-slate-700">
                <CardContent className="p-4">
                  <div className="flex items-center justify-between">
                    <div className="flex items-center gap-4">
                      <div className="w-10 h-10 rounded-lg bg-gradient-to-br from-blue-500 to-cyan-500 flex items-center justify-center">
                        <Globe className="h-5 w-5 text-white" />
                      </div>
                      <div>
                        <div className="flex items-center gap-2">
                          <h3 className="font-medium text-slate-100 text-lg">{domain.name}</h3>
                          {domain.status === 'active' && (
                            <Badge className="bg-green-500/20 text-green-400 border-0">
                              <CheckCircle2 className="h-3 w-3 mr-1" />
                              正常
                            </Badge>
                          )}
                          {domain.status === 'expired' && (
                            <Badge className="bg-red-500/20 text-red-400 border-0">
                              <XCircle className="h-3 w-3 mr-1" />
                              已过期
                            </Badge>
                          )}
                          {domain.status === 'pending' && (
                            <Badge className="bg-yellow-500/20 text-yellow-400 border-0">
                              <Clock className="h-3 w-3 mr-1" />
                              待审核
                            </Badge>
                          )}
                          {sslEnabled && (
                            <Badge className="bg-cyan-500/20 text-cyan-400 border-0">
                              <CheckCircle2 className="h-3 w-3 mr-1" />
                              SSL
                            </Badge>
                          )}
                        </div>
                        <div className="flex items-center gap-4 mt-1 text-sm text-slate-400">
                          <span>注册商: {domain.registrar || '-'}</span>
                          <span>DNS: {domain.dns_provider || domain.dnsProvider || '-'}</span>
                          <span>解析记录: {domain.record_count ?? domain.recordCount ?? 0}条</span>
                        </div>
                      </div>
                    </div>
                    <div className="flex items-center gap-4">
                      <div className="text-right">
                        <p className="text-sm text-slate-400">到期时间</p>
                        <p className={`text-sm font-medium ${daysUntilExpiry < 30 ? 'text-red-400' : 'text-slate-200'}`}>
                          {expireDate ? expireDate.substring(0, 10) : '-'}{expireDate && ` (${daysUntilExpiry}天)`}
                          {sslEnabled && sslExpireDate && (
                            <span className="text-slate-500"> · SSL: {sslExpireDate.substring(0, 10)}</span>
                          )}
                        </p>
                      </div>
                      <div className="flex items-center gap-1">
                        <Button
                          variant="ghost"
                          size="icon"
                          className="h-8 w-8 text-slate-400 hover:text-blue-400"
                          onClick={() => handleOpenEdit(domain)}
                        >
                          <Edit2 className="h-4 w-4" />
                        </Button>
                        <Button
                          variant="ghost"
                          size="icon"
                          className="h-8 w-8 text-slate-400 hover:text-red-400"
                          onClick={() => handleDelete(domain.id)}
                        >
                          <Trash2 className="h-4 w-4" />
                        </Button>
                      </div>
                    </div>
                  </div>
                </CardContent>
              </Card>
            );
          })}
        </div>
      )}

      {/* 创建/编辑域名 Dialog */}
      <Dialog open={formOpen} onOpenChange={setFormOpen}>
        <DialogContent className="bg-slate-800 border-slate-700 text-slate-100 max-w-lg">
          <DialogHeader>
            <DialogTitle className="text-slate-100 flex items-center gap-2">
              <Globe className="h-5 w-5 text-blue-400" />
              {editingDomain ? '编辑域名' : '添加域名'}
            </DialogTitle>
            <DialogDescription className="text-slate-400">
              {editingDomain ? '修改域名注册信息、DNS 配置和 SSL 证书状态' : '录入域名信息，包括注册商、DNS 服务商和到期时间'}
            </DialogDescription>
          </DialogHeader>

          <div className="space-y-4 py-2">
            <div className="space-y-2">
              <Label className="text-slate-300">域名 *</Label>
              <Input
                placeholder="example.com"
                value={formData.name}
                onChange={(e) => setFormData({ ...formData, name: e.target.value })}
                className="bg-slate-900 border-slate-700 text-slate-100"
              />
            </div>

            <div className="grid grid-cols-2 gap-4">
              <div className="space-y-2">
                <Label className="text-slate-300">注册商</Label>
                <Input
                  placeholder="阿里云 / Cloudflare ..."
                  value={formData.registrar}
                  onChange={(e) => setFormData({ ...formData, registrar: e.target.value })}
                  className="bg-slate-900 border-slate-700 text-slate-100"
                />
              </div>
              <div className="space-y-2">
                <Label className="text-slate-300">状态</Label>
                <select
                  value={formData.status}
                  onChange={(e) => setFormData({ ...formData, status: e.target.value })}
                  className="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded-md text-slate-100 text-sm"
                >
                  <option value="active">正常</option>
                  <option value="expired">已过期</option>
                  <option value="pending">待审核</option>
                </select>
              </div>
            </div>

            <div className="grid grid-cols-2 gap-4">
              <div className="space-y-2">
                <Label className="text-slate-300">到期时间</Label>
                <Input
                  type="date"
                  value={formData.expire_date}
                  onChange={(e) => setFormData({ ...formData, expire_date: e.target.value })}
                  className="bg-slate-900 border-slate-700 text-slate-100"
                />
              </div>
              <div className="space-y-2">
                <Label className="text-slate-300">DNS 服务商</Label>
                <Input
                  placeholder="Cloudflare / DNSPod ..."
                  value={formData.dns_provider}
                  onChange={(e) => setFormData({ ...formData, dns_provider: e.target.value })}
                  className="bg-slate-900 border-slate-700 text-slate-100"
                />
              </div>
            </div>

            <div className="space-y-2">
              <Label className="text-slate-300">解析记录数</Label>
              <Input
                type="number"
                placeholder="0"
                value={formData.record_count}
                onChange={(e) => setFormData({ ...formData, record_count: e.target.value })}
                className="bg-slate-900 border-slate-700 text-slate-100"
              />
            </div>

            <div className="grid grid-cols-2 gap-4 items-end">
              <div className="space-y-2">
                <Label className="text-slate-300">SSL 证书到期</Label>
                <Input
                  type="date"
                  value={formData.ssl_expire_date}
                  onChange={(e) => setFormData({ ...formData, ssl_expire_date: e.target.value })}
                  disabled={!formData.ssl_enabled}
                  className="bg-slate-900 border-slate-700 text-slate-100 disabled:opacity-40"
                />
              </div>
              <label className="flex items-center gap-2 cursor-pointer pb-2">
                <input
                  type="checkbox"
                  checked={formData.ssl_enabled}
                  onChange={(e) => setFormData({ ...formData, ssl_enabled: e.target.checked })}
                  className="h-4 w-4 rounded border-slate-600 bg-slate-900 accent-cyan-500"
                />
                <span className="text-slate-300 text-sm">启用 SSL</span>
              </label>
            </div>
          </div>

          <DialogFooter>
            <Button variant="outline" onClick={() => setFormOpen(false)} className="border-slate-700 text-slate-300">
              取消
            </Button>
            <Button
              className="bg-blue-600 hover:bg-blue-700"
              disabled={!formData.name.trim() || submitting}
              onClick={handleSubmit}
            >
              {submitting ? <Loader2 className="h-4 w-4 mr-2 animate-spin" /> : editingDomain ? <Edit2 className="h-4 w-4 mr-2" /> : <Plus className="h-4 w-4 mr-2" />}
              {editingDomain ? '保存修改' : '创建域名'}
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}