"use client";

import { useEffect, useRef, useState } from "react";
import { ArrowRight, Copy, Loader2, Trash2, UploadCloud } from "lucide-react";
import { useRouter } from "next/navigation";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { api } from "@/lib/api";
import type * as Types from "@/lib/types";
import { resolveErrorMessage } from "@/lib/utils";
import { useToast } from "@/hooks/use-toast";

type Props = {
  postId: number;
};

export default function AdminBlogAssets({ postId }: Props) {
  const router = useRouter();
  const { toast } = useToast();
  const fileInputRef = useRef<HTMLInputElement | null>(null);
  const [post, setPost] = useState<Types.PostDetailSchema | null>(null);
  const [assets, setAssets] = useState<Types.PostAssetSchema[]>([]);
  const [loading, setLoading] = useState(true);
  const [uploading, setUploading] = useState(false);
  const [deletingId, setDeletingId] = useState<number | null>(null);

  const loadData = async () => {
    if (!Number.isFinite(postId)) {
      setLoading(false);
      return;
    }

    setLoading(true);
    try {
      const [postData, assetData] = await Promise.all([
        api.getAdminBlogPost(postId),
        api.listBlogPostAssets(postId),
      ]);
      setPost(postData);
      setAssets(assetData);
    } catch (error) {
      toast({
        title: "دریافت مرکز آپلود ناموفق بود",
        description: resolveErrorMessage(error, "دوباره تلاش کنید"),
        variant: "destructive",
      });
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    void loadData();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [postId]);

  const uploadAsset = async (file: File) => {
    setUploading(true);
    try {
      const asset = await api.uploadBlogPostAsset(postId, file, { title: file.name });
      setAssets((prev) => [asset, ...prev]);
      toast({ title: "فایل آپلود شد", variant: "success" });
    } catch (error) {
      toast({
        title: "آپلود ناموفق بود",
        description: resolveErrorMessage(error, "دوباره تلاش کنید"),
        variant: "destructive",
      });
    } finally {
      setUploading(false);
    }
  };

  const onFileChange = (event: React.ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0];
    event.currentTarget.value = "";
    if (file) void uploadAsset(file);
  };

  const copySnippet = async (asset: Types.PostAssetSchema) => {
    const snippet = asset.markdown_image || asset.markdown_link || asset.absolute_file_url || "";
    await navigator.clipboard.writeText(snippet);
    toast({ title: "کد مارک‌داون کپی شد", variant: "success" });
  };

  const deleteAsset = async (assetId: number) => {
    setDeletingId(assetId);
    try {
      await api.deleteBlogPostAsset(postId, assetId);
      setAssets((prev) => prev.filter((asset) => asset.id !== assetId));
      toast({ title: "فایل حذف شد", variant: "success" });
    } catch (error) {
      toast({
        title: "حذف فایل ناموفق بود",
        description: resolveErrorMessage(error, "دوباره تلاش کنید"),
        variant: "destructive",
      });
    } finally {
      setDeletingId(null);
    }
  };

  if (loading) {
    return (
      <div className="flex min-h-[50vh] items-center justify-center" dir="rtl">
        <Loader2 className="h-5 w-5 animate-spin text-muted-foreground" />
      </div>
    );
  }

  return (
    <div className="space-y-6">
      <div className="flex flex-col gap-4 md:flex-row-reverse md:items-center md:justify-between">
        <div className="text-right">
          <h2 className="text-2xl font-bold">مرکز آپلود نوشته</h2>
          <p className="mt-1 text-sm text-muted-foreground">
            {post?.title ? `فایل‌های عمومی مرتبط با «${post.title}»` : "فایل‌های عمومی این نوشته را مدیریت کنید."}
          </p>
        </div>
        <Button variant="outline" onClick={() => router.push(`/admin/blog/${postId}/edit`)}>
          <ArrowRight className="ml-2 h-4 w-4" />
          بازگشت به ویرایش
        </Button>
      </div>

      <Card>
        <CardHeader className="text-right">
          <CardTitle>آپلود فایل</CardTitle>
          <CardDescription>تصاویر، ویدئوها، اسناد و فایل‌های فشرده مجاز هستند. لینک مارک‌داون هر فایل بعد از آپلود قابل کپی است.</CardDescription>
        </CardHeader>
        <CardContent className="space-y-5">
          <input ref={fileInputRef} type="file" className="hidden" onChange={onFileChange} />
          <Button variant="secondary" onClick={() => fileInputRef.current?.click()} disabled={uploading}>
            {uploading ? <Loader2 className="ml-2 h-4 w-4 animate-spin" /> : <UploadCloud className="ml-2 h-4 w-4" />}
            آپلود فایل
          </Button>

          {assets.length ? (
            <div className="grid gap-4 md:grid-cols-2 xl:grid-cols-3">
              {assets.map((asset) => (
                <div key={asset.id} className="rounded-2xl border p-3">
                  <div className="flex flex-row-reverse items-start justify-between gap-3">
                    <div className="text-right">
                      <div className="flex flex-wrap items-center justify-end gap-2">
                        <Badge variant="secondary">{asset.file_type}</Badge>
                        <p className="font-medium">{asset.title}</p>
                      </div>
                      <p className="mt-1 text-xs text-muted-foreground">
                        {asset.mime_type || "file"} · {Math.ceil(asset.size / 1024)} KB
                      </p>
                    </div>
                    <div className="flex shrink-0 gap-1">
                      <Button variant="ghost" size="icon" onClick={() => copySnippet(asset)}>
                        <Copy className="h-4 w-4" />
                      </Button>
                      <Button
                        variant="ghost"
                        size="icon"
                        className="text-destructive hover:text-destructive"
                        onClick={() => deleteAsset(asset.id)}
                        disabled={deletingId === asset.id}
                      >
                        {deletingId === asset.id ? <Loader2 className="h-4 w-4 animate-spin" /> : <Trash2 className="h-4 w-4" />}
                      </Button>
                    </div>
                  </div>
                  {asset.absolute_preview_url ? (
                    <img src={asset.absolute_preview_url} alt={asset.alt_text || asset.title} className="mt-3 aspect-video w-full rounded-xl object-cover" />
                  ) : asset.absolute_file_url ? (
                    <a className="mt-3 block truncate rounded-xl bg-muted px-3 py-2 text-left text-xs underline" href={asset.absolute_file_url} target="_blank" rel="noreferrer">
                      {asset.absolute_file_url}
                    </a>
                  ) : null}
                </div>
              ))}
            </div>
          ) : (
            <div className="rounded-2xl border border-dashed p-8 text-center text-sm text-muted-foreground">
              هنوز فایلی برای این نوشته آپلود نشده است.
            </div>
          )}
        </CardContent>
      </Card>
    </div>
  );
}