import { useEffect, useState } from 'react';
import { debugImageProxyUrl, type DebugImageSearchManyResult, type DebugImageSearchResultItem } from '../api/client';
import './DebugSearchResultsModal.css';

function formatResolution(width?: number, height?: number): string | null {
  if (!width || !height || width <= 0 || height <= 0) return null;
  return `${width} × ${height}`;
}

function ResultResolution({
  item,
  searchUrl,
}: {
  item: DebugImageSearchResultItem;
  searchUrl: string;
}) {
  const initial = formatResolution(item.width, item.height);
  const [label, setLabel] = useState<string | null>(initial);

  useEffect(() => {
    if (initial) {
      setLabel(initial);
      return;
    }

    let cancelled = false;
    const img = new Image();
    img.onload = () => {
      if (cancelled) return;
      const text = formatResolution(img.naturalWidth, img.naturalHeight);
      setLabel(text ?? '—');
    };
    img.onerror = () => {
      if (!cancelled) setLabel('—');
    };
    img.src = debugImageProxyUrl(item.imageUrl, {
      searchUrl,
      source: item.source,
    });

    return () => {
      cancelled = true;
      img.onload = null;
      img.onerror = null;
    };
  }, [item.imageUrl, item.source, item.width, item.height, searchUrl, initial]);

  return (
    <span className="debug-search-modal-item-resolution" aria-hidden="true">
      {label ?? '…'}
    </span>
  );
}

interface Props {
  open: boolean;
  title: string;
  data: DebugImageSearchManyResult | null;
  loading: boolean;
  error: string | null;
  applyingUrl: string | null;
  onClose: () => void;
  onSelect: (item: DebugImageSearchResultItem) => void;
}

export default function DebugSearchResultsModal({
  open,
  title,
  data,
  loading,
  error,
  applyingUrl,
  onClose,
  onSelect,
}: Props) {
  useEffect(() => {
    if (!open) return;

    const onKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    window.addEventListener('keydown', onKeyDown);
    return () => window.removeEventListener('keydown', onKeyDown);
  }, [open, onClose]);

  if (!open) return null;

  return (
    <div
      className="debug-search-modal-overlay"
      role="dialog"
      aria-modal="true"
      aria-label={title}
      onClick={onClose}
    >
      <div className="debug-search-modal" onClick={(e) => e.stopPropagation()}>
        <header className="debug-search-modal-header">
          <div>
            <h3>{title}</h3>
            {data?.query && <p className="debug-search-modal-query">{data.query}</p>}
          </div>
          <button type="button" className="debug-search-modal-close" onClick={onClose} aria-label="Close">
            ×
          </button>
        </header>

        {loading && <p className="debug-search-modal-status">Loading results…</p>}
        {error && <p className="debug-search-modal-error">{error}</p>}

        {!loading && !error && data && data.results.length === 0 && (
          <p className="debug-search-modal-status">No images found.</p>
        )}

        {!loading && data && data.results.length > 0 && (
          <>
            <p className="debug-search-modal-hint">Click an image to replace the current one.</p>
            <div className="debug-search-modal-grid">
              {data.results.map((item, index) => {
                const busy = applyingUrl === item.imageUrl;
                return (
                  <button
                    key={`${item.imageUrl}-${index}`}
                    type="button"
                    className={`debug-search-modal-item${busy ? ' debug-search-modal-item-busy' : ''}`}
                    disabled={!!applyingUrl}
                    onClick={() => onSelect(item)}
                    title="Use this image"
                  >
                    <span className="debug-search-modal-item-media">
                      <img
                        src={debugImageProxyUrl(item.thumbUrl || item.imageUrl, {
                          searchUrl: data.searchUrl,
                          source: item.source,
                        })}
                        alt={`Result ${index + 1}`}
                        loading="lazy"
                        onError={(e) => {
                          (e.target as HTMLImageElement).src = '/placeholder-art.svg';
                        }}
                      />
                      <span className="debug-search-modal-item-index">{index + 1}</span>
                      {busy && <span className="debug-search-modal-item-busy-label">Saving…</span>}
                    </span>
                    <ResultResolution item={item} searchUrl={data.searchUrl} />
                  </button>
                );
              })}
            </div>
          </>
        )}
      </div>
    </div>
  );
}