"use client";

// Image association control used by media, music, categories, etc.
// Lets the user either (a) pick an existing image from the /images library
// (sets `image_id`) or (b) upload a new image file (sets `image` File). Shows a
// live thumbnail of the current choice.

import { useEffect, useMemo, useState } from "react";
import { useList } from "@/lib/useResource";
import { pickUrl, IMAGE_KEYS } from "@/lib/media";
import { Button, Modal, Spinner, EmptyState } from "./ui";
import { ImageIcon, CloseIcon } from "./icons";

interface LibImage {
  id: number;
  title?: string | null;
}

export function ImagePicker({
  imageId,
  onPickId,
  file,
  onPickFile,
  existingUrl,
}: {
  imageId: number | null;
  onPickId: (id: number | null) => void;
  file: File | null;
  onPickFile: (f: File | null) => void;
  // URL of the already-saved image (edit mode) when no new choice is made.
  existingUrl?: string | null;
}) {
  const [libOpen, setLibOpen] = useState(false);
  const { data: images, loading } = useList<LibImage>(
    libOpen ? "/images/all" : null,
  );

  // Object URL preview for a freshly uploaded file.
  const [filePreview, setFilePreview] = useState<string | null>(null);
  useEffect(() => {
    if (!file) {
      setFilePreview(null);
      return;
    }
    const url = URL.createObjectURL(file);
    setFilePreview(url);
    return () => URL.revokeObjectURL(url);
  }, [file]);

  // Resolve the thumbnail for the currently chosen library image (if loaded).
  const pickedLibUrl = useMemo(() => {
    if (!imageId || !images.length) return null;
    const found = images.find((i) => i.id === imageId);
    return found ? pickUrl(found, IMAGE_KEYS) : null;
  }, [imageId, images]);

  const preview = filePreview ?? pickedLibUrl ?? existingUrl ?? null;

  function clearAll() {
    onPickId(null);
    onPickFile(null);
  }

  return (
    <div className="flex items-center gap-3">
      <div className="flex h-16 w-16 shrink-0 items-center justify-center overflow-hidden rounded-xl border border-border bg-surface-muted text-muted">
        {preview ? (
          // eslint-disable-next-line @next/next/no-img-element
          <img src={preview} alt="" className="h-full w-full object-cover" />
        ) : (
          <ImageIcon className="h-6 w-6" />
        )}
      </div>

      <div className="flex flex-wrap gap-2">
        <Button
          type="button"
          variant="secondary"
          onClick={() => setLibOpen(true)}
        >
          انتخاب از کتابخانه
        </Button>

        <label className="inline-flex cursor-pointer items-center justify-center gap-2 rounded-xl border border-border bg-surface-muted px-4 py-2 text-sm font-medium text-foreground transition hover:bg-surface-hover">
          بارگذاری تصویر
          <input
            type="file"
            accept="image/*"
            className="hidden"
            onChange={(e) => {
              const f = e.target.files?.[0] ?? null;
              onPickFile(f);
              if (f) onPickId(null); // a fresh upload supersedes a library pick
            }}
          />
        </label>

        {(preview || imageId || file) && (
          <Button
            type="button"
            variant="ghost"
            className="text-danger"
            icon={<CloseIcon className="h-4 w-4" />}
            onClick={clearAll}
          >
            حذف
          </Button>
        )}
      </div>

      <Modal
        open={libOpen}
        onClose={() => setLibOpen(false)}
        title="انتخاب تصویر از کتابخانه"
      >
        {loading ? (
          <div className="flex justify-center py-10">
            <Spinner />
          </div>
        ) : !images.length ? (
          <EmptyState
            title="تصویری موجود نیست"
            message="ابتدا از بخش «کتابخانه تصاویر» تصویر اضافه کنید."
          />
        ) : (
          <div className="grid grid-cols-3 gap-3 sm:grid-cols-4">
            {images.map((img) => {
              const url = pickUrl(img, IMAGE_KEYS);
              const selected = img.id === imageId;
              return (
                <button
                  key={img.id}
                  type="button"
                  onClick={() => {
                    onPickId(img.id);
                    onPickFile(null);
                    setLibOpen(false);
                  }}
                  className={`overflow-hidden rounded-xl border-2 transition ${
                    selected
                      ? "border-primary"
                      : "border-transparent hover:border-border"
                  }`}
                  title={img.title ?? String(img.id)}
                >
                  {/* eslint-disable-next-line @next/next/no-img-element */}
                  <img src={url ?? ""} alt={img.title ?? ""} className="aspect-square w-full object-cover" />
                </button>
              );
            })}
          </div>
        )}
      </Modal>
    </div>
  );
}