"use client";

import { useState, useEffect, useCallback } from "react";
import Link from "next/link";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import {
  portalLinksApi,
  type PortalLinkRead,
  type PortalLinkCreate,
} from "@/lib/api/client";
import { Globe, Plus, Pencil, Trash2, Loader2, ExternalLink } from "lucide-react";
import { toast } from "sonner";

export default function SettingsPortalLinksPage() {
  const [links, setLinks] = useState<PortalLinkRead[]>([]);
  const [loading, setLoading] = useState(true);
  const [dialogOpen, setDialogOpen] = useState(false);
  const [editingId, setEditingId] = useState<string | null>(null);
  const [saving, setSaving] = useState(false);
  const [form, setForm] = useState({ name: "", url: "" });

  const loadLinks = useCallback(async () => {
    try {
      const list = await portalLinksApi.list();
      setLinks(list);
    } catch {
      toast.error("加载快捷门户列表失败");
    } finally {
      setLoading(false);
    }
  }, []);

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

  const openAdd = () => {
    setEditingId(null);
    setForm({ name: "", url: "" });
    setDialogOpen(true);
  };

  const openEdit = (item: PortalLinkRead) => {
    setEditingId(item.id);
    setForm({ name: item.name, url: item.url });
    setDialogOpen(true);
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!form.name.trim() || !form.url.trim()) {
      toast.error("请填写名称和链接");
      return;
    }
    setSaving(true);
    try {
      if (editingId) {
        await portalLinksApi.update(editingId, {
          name: form.name.trim(),
          url: form.url.trim(),
        });
        toast.success("已更新");
      } else {
        const payload: PortalLinkCreate = {
          name: form.name.trim(),
          url: form.url.trim(),
        };
        await portalLinksApi.create(payload);
        toast.success("已添加");
      }
      setDialogOpen(false);
      await loadLinks();
      if (typeof window !== "undefined") {
        window.dispatchEvent(new CustomEvent("portal-links-changed"));
      }
    } catch (e) {
      toast.error(e instanceof Error ? e.message : "保存失败");
    } finally {
      setSaving(false);
    }
  };

  const handleDelete = async (id: string) => {
    if (!confirm("确定删除该快捷门户入口？")) return;
    try {
      await portalLinksApi.delete(id);
      toast.success("已删除");
      await loadLinks();
      if (typeof window !== "undefined") {
        window.dispatchEvent(new CustomEvent("portal-links-changed"));
      }
    } catch (e) {
      toast.error(e instanceof Error ? e.message : "删除失败");
    }
  };

  return (
    <div className="p-6 max-w-4xl">
      <div className="mb-4">
        <Link
          href="/settings"
          className="text-sm text-muted-foreground hover:text-foreground"
        >
          ← 设置
        </Link>
      </div>
      <Card>
        <CardHeader>
          <div className="flex flex-wrap items-center justify-between gap-3">
            <div>
              <CardTitle className="flex items-center gap-2">
                <Globe className="h-5 w-5" />
                快捷门户
              </CardTitle>
              <p className="text-sm text-muted-foreground mt-1">
                添加税务、公积金等门户链接，侧栏可快速打开。
              </p>
            </div>
            <Button onClick={openAdd}>
              <Plus className="h-4 w-4" />
              <span className="ml-2">添加入口</span>
            </Button>
          </div>
        </CardHeader>
        <CardContent>
          {loading ? (
            <p className="text-sm text-muted-foreground flex items-center gap-1">
              <Loader2 className="h-4 w-4 animate-spin" />
              加载中…
            </p>
          ) : links.length === 0 ? (
            <p className="text-sm text-muted-foreground py-4">
              暂无快捷门户入口。添加后将显示在左侧边栏「快捷门户」区域。
            </p>
          ) : (
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead>名称</TableHead>
                  <TableHead>链接</TableHead>
                  <TableHead className="w-[120px]">操作</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {links.map((item) => (
                  <TableRow key={item.id}>
                    <TableCell className="font-medium">{item.name}</TableCell>
                    <TableCell>
                      <a
                        href={item.url}
                        target="_blank"
                        rel="noopener noreferrer"
                        className="text-primary hover:underline truncate max-w-[280px] inline-block"
                      >
                        {item.url}
                      </a>
                    </TableCell>
                    <TableCell>
                      <div className="flex items-center gap-1">
                        <Button
                          variant="ghost"
                          size="sm"
                          onClick={() => openEdit(item)}
                          title="编辑"
                        >
                          <Pencil className="h-4 w-4" />
                        </Button>
                        <Button
                          variant="ghost"
                          size="sm"
                          onClick={() => handleDelete(item.id)}
                          title="删除"
                        >
                          <Trash2 className="h-4 w-4 text-destructive" />
                        </Button>
                        <Button variant="ghost" size="sm" asChild title="打开">
                          <a href={item.url} target="_blank" rel="noopener noreferrer">
                            <ExternalLink className="h-4 w-4" />
                          </a>
                        </Button>
                      </div>
                    </TableCell>
                  </TableRow>
                ))}
              </TableBody>
            </Table>
          )}
        </CardContent>
      </Card>

      <Dialog open={dialogOpen} onOpenChange={setDialogOpen}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>
              {editingId ? "编辑快捷门户入口" : "添加快捷门户入口"}
            </DialogTitle>
          </DialogHeader>
          <form onSubmit={handleSubmit}>
            <div className="grid gap-4 py-4">
              <div className="grid gap-2">
                <Label htmlFor="portal-name">显示名称</Label>
                <Input
                  id="portal-name"
                  value={form.name}
                  onChange={(e) => setForm((f) => ({ ...f, name: e.target.value }))}
                  placeholder="如：电子税务局、公积金"
                />
              </div>
              <div className="grid gap-2">
                <Label htmlFor="portal-url">门户链接</Label>
                <Input
                  id="portal-url"
                  type="url"
                  value={form.url}
                  onChange={(e) => setForm((f) => ({ ...f, url: e.target.value }))}
                  placeholder="https://..."
                />
              </div>
            </div>
            <DialogFooter>
              <Button
                type="button"
                variant="outline"
                onClick={() => setDialogOpen(false)}
              >
                取消
              </Button>
              <Button type="submit" disabled={saving}>
                {saving && <Loader2 className="h-4 w-4 animate-spin mr-1" />}
                {editingId ? "保存" : "添加"}
              </Button>
            </DialogFooter>
          </form>
        </DialogContent>
      </Dialog>
    </div>
  );
}