"use client";

import { useEffect, useState } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog";
import { Card, CardContent } from "@/components/ui/card";
import {
  Pencil,
  Trash2,
  Plus,
  ExternalLink,
  Globe,
} from "lucide-react";

interface Bookmark {
  id: number;
  title: string;
  url: string;
  description: string;
  icon: string;
  category: string;
  sortOrder: number;
}

export function BookmarkManager() {
  const [bookmarks, setBookmarks] = useState<Bookmark[]>([]);
  const [categories, setCategories] = useState<string[]>([]);
  const [loading, setLoading] = useState(true);
  const [dialogOpen, setDialogOpen] = useState(false);
  const [editing, setEditing] = useState<Bookmark | null>(null);

  const [title, setTitle] = useState("");
  const [url, setUrl] = useState("");
  const [description, setDescription] = useState("");
  const [icon, setIcon] = useState("");
  const [category, setCategory] = useState("");
  const [sortOrder, setSortOrder] = useState(0);

  async function fetchBookmarks() {
    setLoading(true);
    try {
      const res = await fetch("/api/proxy/bookmarks");
      if (!res.ok) throw new Error("failed to fetch");
      const data = await res.json();
      setBookmarks(data.bookmarks || []);
      setCategories(data.categories || []);
    } catch {
      setBookmarks([]);
      setCategories([]);
    } finally {
      setLoading(false);
    }
  }

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

  function openAdd() {
    setEditing(null);
    setTitle("");
    setUrl("");
    setDescription("");
    setIcon("");
    setCategory("");
    setSortOrder(0);
    setDialogOpen(true);
  }

  function openEdit(bm: Bookmark) {
    setEditing(bm);
    setTitle(bm.title);
    setUrl(bm.url);
    setDescription(bm.description);
    setIcon(bm.icon);
    setCategory(bm.category);
    setSortOrder(bm.sortOrder);
    setDialogOpen(true);
  }

  async function handleSave() {
    const payload = {
      title,
      url,
      description,
      icon,
      category: category || "默认",
      sortOrder,
    };

    try {
      const res = editing
        ? await fetch(`/api/proxy/bookmarks/${editing.id}`, {
            method: "PUT",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify(payload),
          })
        : await fetch("/api/proxy/bookmarks", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify(payload),
          });

      if (!res.ok) throw new Error("save failed");
      setDialogOpen(false);
      fetchBookmarks();
    } catch {
      alert("保存失败，请检查输入");
    }
  }

  async function handleDelete(id: number) {
    if (!confirm("确定要删除这个书签吗？")) return;
    try {
      const res = await fetch(`/api/proxy/bookmarks/${id}`, {
        method: "DELETE",
      });
      if (!res.ok) throw new Error("delete failed");
      fetchBookmarks();
    } catch {
      alert("删除失败");
    }
  }

  const grouped = bookmarks.reduce<Record<string, Bookmark[]>>((acc, bm) => {
    const cat = bm.category || "默认";
    if (!acc[cat]) acc[cat] = [];
    acc[cat].push(bm);
    return acc;
  }, {});

  if (loading) {
    return <p className="text-muted-foreground">加载中...</p>;
  }

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <p className="text-sm text-muted-foreground">
          共 {bookmarks.length} 个书签
        </p>
        <Button size="sm" onClick={openAdd}>
          <Plus className="mr-1 size-4" />
          添加书签
        </Button>
      </div>

      {bookmarks.length === 0 ? (
        <div className="rounded-xl border border-dashed py-12 text-center">
          <Globe className="mx-auto mb-3 size-8 text-muted-foreground" />
          <p className="text-muted-foreground">还没有书签</p>
          <Button variant="link" size="sm" onClick={openAdd}>
            添加第一个书签
          </Button>
        </div>
      ) : (
        Object.entries(grouped).map(([cat, items]) => (
          <div key={cat}>
            <h2 className="mb-3 text-sm font-semibold text-muted-foreground uppercase tracking-wide">
              {cat}
            </h2>
            <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
              {items.map((bm) => (
                <Card key={bm.id} className="group relative">
                  <CardContent className="flex items-start gap-3 p-4">
                    <div className="flex size-10 shrink-0 items-center justify-center rounded-lg bg-muted">
                      {bm.icon ? (
                        <img
                          src={bm.icon}
                          alt=""
                          className="size-5 object-contain"
                          onError={(e) => {
                            (e.target as HTMLImageElement).style.display =
                              "none";
                          }}
                        />
                      ) : (
                        <Globe className="size-5 text-muted-foreground" />
                      )}
                    </div>
                    <div className="min-w-0 flex-1">
                      <a
                        href={bm.url}
                        target="_blank"
                        rel="noopener noreferrer"
                        className="flex items-center gap-1 font-medium hover:underline"
                      >
                        <span className="truncate">{bm.title}</span>
                        <ExternalLink className="size-3 shrink-0 text-muted-foreground" />
                      </a>
                      {bm.description && (
                        <p className="mt-0.5 line-clamp-2 text-xs text-muted-foreground">
                          {bm.description}
                        </p>
                      )}
                    </div>
                    <div className="flex shrink-0 gap-1 opacity-0 transition-opacity group-hover:opacity-100">
                      <Button
                        variant="ghost"
                        size="icon-xs"
                        onClick={() => openEdit(bm)}
                      >
                        <Pencil className="size-3.5" />
                      </Button>
                      <Button
                        variant="ghost"
                        size="icon-xs"
                        onClick={() => handleDelete(bm.id)}
                      >
                        <Trash2 className="size-3.5 text-destructive" />
                      </Button>
                    </div>
                  </CardContent>
                </Card>
              ))}
            </div>
          </div>
        ))
      )}

      <Dialog open={dialogOpen} onOpenChange={setDialogOpen}>
        <DialogContent className="sm:max-w-md">
          <DialogHeader>
            <DialogTitle>
              {editing ? "编辑书签" : "添加书签"}
            </DialogTitle>
          </DialogHeader>
          <div className="space-y-3 py-2">
            <div>
              <label className="mb-1 block text-sm font-medium">
                标题 *
              </label>
              <Input
                value={title}
                onChange={(e) => setTitle(e.target.value)}
                placeholder="例如：GitHub"
              />
            </div>
            <div>
              <label className="mb-1 block text-sm font-medium">
                链接 *
              </label>
              <Input
                value={url}
                onChange={(e) => setUrl(e.target.value)}
                placeholder="https://github.com"
              />
            </div>
            <div>
              <label className="mb-1 block text-sm font-medium">描述</label>
              <Input
                value={description}
                onChange={(e) => setDescription(e.target.value)}
                placeholder="简短描述"
              />
            </div>
            <div className="grid grid-cols-2 gap-3">
              <div>
                <label className="mb-1 block text-sm font-medium">
                  分类
                </label>
                <Input
                  value={category}
                  onChange={(e) => setCategory(e.target.value)}
                  placeholder="默认"
                  list="categories"
                />
                <datalist id="categories">
                  {categories.map((c) => (
                    <option key={c} value={c} />
                  ))}
                </datalist>
              </div>
              <div>
                <label className="mb-1 block text-sm font-medium">
                  排序
                </label>
                <Input
                  type="number"
                  value={sortOrder}
                  onChange={(e) =>
                    setSortOrder(Number(e.target.value))
                  }
                />
              </div>
            </div>
            <div>
              <label className="mb-1 block text-sm font-medium">
                图标 URL
              </label>
              <Input
                value={icon}
                onChange={(e) => setIcon(e.target.value)}
                placeholder="https://example.com/favicon.ico"
              />
            </div>
          </div>
          <DialogFooter>
            <Button
              variant="outline"
              size="sm"
              onClick={() => setDialogOpen(false)}
            >
              取消
            </Button>
            <Button size="sm" onClick={handleSave}>
              保存
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}