'use client';

import './style.scss';
import Link from 'next/link';
import Image from 'next/image';
import { useState } from 'react';
import { useMemberContext } from '@/contexts/memberProvider';
import useErrorAlert from '@/hooks/useErrorAlert';
import { fetchApi, throwError } from '@/lib/utils/client';
import Loading from '@/app/component/Loading';

export default function ChangeThumb()
{
	const { member, setMember } = useMemberContext();
	const { setError } = useErrorAlert();
	const [loading, setLoading] = useState<boolean>(false);
	const [newThumb, setNewThumb] = useState<File|null>(null);
	const [preview, setPreview] = useState<string|null>(null);

	const resetFileInput = () => {
		const fileInput = document.getElementById("thumb") as HTMLInputElement;
		if (fileInput) fileInput.value = "";
	};

	const handleSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
		e.preventDefault();

		if (!member) {
			return;
		}

		if (!newThumb) {
			return setError('사진을 선택하세요.');
		}

		setLoading(true);

		const formData = new FormData();
		formData.append('thumb', newThumb);

		fetchApi<{thumbUrl: string}>('/api/mypage/thumb', {
			method: 'POST',
			body: formData
		}).then((res) => {
			throwError(res);

			member.thumb = (res.data?.thumbUrl || null);
			setMember(member);
			localStorage.setItem('member', JSON.stringify(member));

			alert("사진이 변경되었습니다.");
		}).catch(err => {
			setError(err.message);
		}).finally(() => {
			setLoading(false);
			setNewThumb(null);
			setPreview(null);
			resetFileInput();
		});
	}

	const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
		if (e.target.files && e.target.files[0]) {
			const selectedFile = e.target.files[0];
			setNewThumb(selectedFile);

			// 이미지 미리보기
			const reader = new FileReader();
            reader.onloadend = () => setPreview(reader.result as string);
            reader.readAsDataURL(selectedFile);
		}
	};

	const handleRemove = async () => {
		// 미리보기만 있고 서버에 저장된 사진이 아닌 경우 로컬만 초기화
		if (!member?.thumb) {
			setNewThumb(null);
			setPreview(null);
			resetFileInput();
			return;
		}

		if (!confirm('사진을 삭제하시겠습니까?')) {
			return;
		}

		setLoading(true);

		fetchApi('/api/mypage/thumb', {
			method: 'DELETE'
		}).then((res) => {
			throwError(res);

			member.thumb = null;
			setMember(member);
			localStorage.setItem('member', JSON.stringify(member));

			setNewThumb(null);
			setPreview(null);
			resetFileInput();

			alert("사진이 삭제되었습니다.");
		}).catch(err => {
			setError(err.message);
		}).finally(() => {
			setLoading(false);
		});
	};

	return (
		<div id="changeThumb">
			{ loading && <Loading /> }

			<h1>회원 사진</h1>
			<form method="post" acceptCharset="utf-8" autoComplete="off" onSubmit={handleSubmit}>
				<table className="table-auto max-xl:w-full lg:w-[600px]">
					<caption>
						커뮤니티 프로필에 대표 사진을 설정할 수 있습니다.
					</caption>
					<colgroup>
						<col width="140px"/>
						<col width="*"/>
					</colgroup>
					<tbody>
						<tr>
							<th>
								<figure>
									{preview ?
										<Image src={preview} alt="미리보기" width={140} height={140} layout="responsive" style={{objectFit: "cover"}} />
										:
										member?.thumb ?
											<Image src={member.thumb} alt={member.email} width={140} height={140} style={{objectFit: "cover"}} unoptimized={true} />
											:
											<Image src="/resources/thumb.gif" alt="기본 사진" width={140} height={140} style={{objectFit: "cover"}} />
									}
								</figure>
							</th>
							<td>
								<div className="flex justify-start gap-2">
									<label htmlFor="thumb" className="btn btn-default">사진 변경</label>
									<input type="file" id="thumb" accept="image/jpg,image/jpeg,image/png,image/gif" hidden onChange={handleChange} />

									{(preview || member?.thumb) &&
										<button type="button" className="btn btn-default" onClick={handleRemove}>삭제</button>
									}
								</div>
								<p className="mt-3">
									98x98 크기 이상, 4MB 이하의 사진이 권장됩니다. 이미지 파일을 사용하세요. 사진이 {process.env.NEXT_PUBLIC_SITE_NAME} 커뮤니티 가이드를 준수해야 합니다.
								</p>
							</td>
						</tr>
					</tbody>
					<tfoot>
						<tr>
							<td colSpan={2}>
								<div className="flex justify-center gap-2">
									<button type="submit" className="btn btn-submit">확인</button>
									<Link href="/profile" className="btn btn-default">취소</Link>
								</div>
							</td>
						</tr>
					</tfoot>
				</table>
			</form>
		</div>
	);
}