import { useState, useEffect } from '@wordpress/element';
import { MediaUpload } from '@wordpress/media-utils';
import {MediaUploadCheck} from '@wordpress/block-editor';
import { Button } from '@wordpress/components';
import apiFetch from '@wordpress/api-fetch';

const SUBTYPE_MAP = { image: 'image', video: 'video', document: 'application', all: '' };

const Thumbnail = ({ id, onRemove }) => {
	const [media, setMedia] = useState(null);

	useEffect(() => {
		let cancelled = false;
		if (!id) return;
		apiFetch({ path: `/wp/v2/media/${id}` })
			.then((data) => !cancelled && setMedia(data))
			.catch(() => {});
		return () => { cancelled = true; };
	}, [id]);

	const thumb = media?.media_details?.sizes?.thumbnail?.source_url || media?.source_url;
	const isImage = media?.media_type === 'image';

	return (
		<div className="jvb-upload-thumb">
			{isImage && thumb ? (
				<img src={thumb} alt={media?.alt_text || ''} />
			) : (
				<div className="jvb-upload-thumb-placeholder">
					{media?.title?.rendered || `#${id}`}
				</div>
			)}
			<Button variant="link" isDestructive onClick={() => onRemove(id)}>
				Remove
			</Button>
		</div>
	);
};

const UploadField = ({ field, value, onChange }) => {
	const multiple = field.multiple || field.type === 'gallery';
	const ids = multiple ? (Array.isArray(value) ? value : []) : value;
	const allowedTypes = SUBTYPE_MAP[field.subtype] ? [SUBTYPE_MAP[field.subtype]] : '';

	const onSelect = (media) => onChange(multiple ? media.map((m) => m.id) : media.id);

	const onRemove = (id) => {
		onChange(multiple ? ids.filter((existing) => existing !== id) : 0);
	};

	return (
		<div className="jvb-upload-field" id={field.name}>
			<p className="jvb-field-label">{field.label}</p>

			<div className={multiple ? 'jvb-upload-grid' : 'jvb-upload-single'}>
				{multiple
					? ids.map((id) => <Thumbnail key={id} id={id} onRemove={onRemove} />)
					: !!ids && <Thumbnail id={ids} onRemove={onRemove} />}
			</div>

			<MediaUploadCheck>
				<MediaUpload
					onSelect={onSelect}
					allowedTypes={allowedTypes}
					multiple={multiple}
					value={multiple ? ids : ids || undefined}
					render={({ open }) => (
						<Button variant="secondary" onClick={open}>
							{(multiple ? ids.length : ids) ? 'Change' : 'Select'} {field.label}
						</Button>
					)}
				/>
			</MediaUploadCheck>
		</div>
	);
};

export default UploadField;