'use client';

import { useRef, useState } from 'react';
import { useRouter } from 'next/navigation';
import { ImageIcon, Camera, Trash2, User } from 'lucide-react';
import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog';
import { fetchApi } from '@/lib/utils/client';
import { useMemberContext } from '@/contexts/memberProvider';
import { UserProfileDto } from '@/types/account/profile';

type Props = {
	open: boolean;
	onOpenChange: (open: boolean) => void;
	profile: UserProfileDto;
};

export default function UserProfileEditDialog({ open, onOpenChange, profile }: Props) {
	const router = useRouter();
	const { member, setMember } = useMemberContext();

	const persistMember = (next: typeof member) => {
		if (!next) {
			return;
		}
		setMember(next);
		try {
			localStorage.setItem('member', JSON.stringify(next));
			document.cookie = `member=${encodeURIComponent(JSON.stringify(next))}; path=/; max-age=${60 * 60 * 24 * 30}`;
		} catch {
			// ignore
		}
	};

	const [bannerFile, setBannerFile] = useState<File|null>(null);
	const [bannerPreview, setBannerPreview] = useState<string|null>(profile.bannerUrl);
	const [bannerRemoved, setBannerRemoved] = useState<boolean>(false);

	const [thumbFile, setThumbFile] = useState<File|null>(null);
	const [thumbPreview, setThumbPreview] = useState<string|null>(profile.thumb);

	const [name, setName] = useState<string>(profile.name ?? '');
	const [intro, setIntro] = useState<string>(profile.intro ?? '');

	const [submitting, setSubmitting] = useState(false);
	const [error, setError] = useState<string|null>(null);

	const bannerInputRef = useRef<HTMLInputElement|null>(null);
	const thumbInputRef = useRef<HTMLInputElement|null>(null);

	const handleBannerSelect = (files: FileList|null) => {
		const file = files?.[0];
		if (!file || !file.type.startsWith('image/')) {
			return;
		}
		setBannerFile(file);
		setBannerRemoved(false);
		const reader = new FileReader();
		reader.onloadend = () => setBannerPreview(reader.result as string);
		reader.readAsDataURL(file);
	};

	const handleBannerRemove = () => {
		setBannerFile(null);
		setBannerPreview(null);
		setBannerRemoved(true);
	};

	const handleThumbSelect = (files: FileList|null) => {
		const file = files?.[0];
		if (!file || !file.type.startsWith('image/')) {
			return;
		}
		setThumbFile(file);
		const reader = new FileReader();
		reader.onloadend = () => setThumbPreview(reader.result as string);
		reader.readAsDataURL(file);
	};

	const handleSubmit = async () => {
		if (!member || submitting) {
			return;
		}

		setSubmitting(true);
		setError(null);

		try {
			const nameChanged = name.trim() !== (profile.name ?? '');
			const introChanged = intro !== (profile.intro ?? '');

			if (bannerFile) {
				const form = new FormData();
				form.append('banner', bannerFile);
				const res = await fetchApi<{ bannerUrl: string }>('/api/mypage/banner', { method: 'POST', body: form, silent: true });
				if (!res.success) {
					throw new Error(res.message ?? '배너 업로드 실패');
				}
			} else if (bannerRemoved && profile.bannerUrl) {
				const res = await fetchApi('/api/mypage/banner', { method: 'DELETE', silent: true });
				if (!res.success) {
					throw new Error(res.message ?? '배너 삭제 실패');
				}
			}

			if (thumbFile) {
				const form = new FormData();
				form.append('thumb', thumbFile);
				const res = await fetchApi<{ thumbUrl: string }>('/api/mypage/thumb', { method: 'POST', body: form, silent: true });
				if (!res.success) {
					throw new Error(res.message ?? '프로필 사진 업로드 실패');
				}
				if (member && res.data?.thumbUrl !== undefined) {
					persistMember({ ...member, thumb: res.data.thumbUrl });
				}
			}

			if (nameChanged) {
				const res = await fetchApi('/api/mypage/name', { method: 'POST', body: { Name: name.trim() }, silent: true });
				if (!res.success) {
					throw new Error(res.message ?? '별명 변경 실패');
				}
				if (member) {
					persistMember({ ...member, name: name.trim() });
				}
			}

			if (introChanged) {
				const res = await fetchApi('/api/mypage/intro', { method: 'POST', body: { Intro: intro }, silent: true });
				if (!res.success) {
					throw new Error(res.message ?? '자기소개 변경 실패');
				}
				if (member) {
					persistMember({ ...member, intro });
				}
			}

			onOpenChange(false);
			router.refresh();
		} catch (err) {
			setError(err instanceof Error ? err.message : '저장 실패');
		} finally {
			setSubmitting(false);
		}
	};

	return (
		<Dialog open={open} onOpenChange={onOpenChange}>
			<DialogContent className="user-profile__edit-dialog">
				<DialogHeader>
					<DialogTitle>프로필 편집</DialogTitle>
				</DialogHeader>

				<div className="user-profile__edit-body">
					<div className="user-profile__edit-banner">
						{bannerPreview ? (
							<img src={bannerPreview} alt="배너 미리보기" />
						) : (
							<div className="user-profile__edit-banner-placeholder" />
						)}
						<div className="user-profile__edit-banner-actions">
							<button type="button" className="user-profile__edit-banner-btn" onClick={() => bannerInputRef.current?.click()} aria-label="배너 변경">
								<ImageIcon size={18} />
							</button>
							{bannerPreview && (
								<button type="button" className="user-profile__edit-banner-btn" onClick={handleBannerRemove} aria-label="배너 제거">
									<Trash2 size={18} />
								</button>
							)}
						</div>
						<input ref={bannerInputRef} type="file" accept="image/*" hidden onChange={(e) => handleBannerSelect(e.target.files)} />
					</div>

					<div className="user-profile__edit-avatar-wrap">
						{thumbPreview ? (
							<img src={thumbPreview} alt="프로필 사진 미리보기" className="user-profile__edit-avatar" />
						) : (
							<span className="user-profile__edit-avatar user-profile__edit-avatar--empty" aria-hidden="true">
								<User size={40} strokeWidth={1.5} />
							</span>
						)}
						<button type="button" className="user-profile__edit-avatar-btn" onClick={() => thumbInputRef.current?.click()} aria-label="프로필 사진 변경">
							<Camera size={16} />
						</button>
						<input ref={thumbInputRef} type="file" accept="image/*" hidden onChange={(e) => handleThumbSelect(e.target.files)} />
					</div>

					<div className="user-profile__edit-fields">
						<label className="user-profile__edit-field">
							<span>별명</span>
							<input type="text" value={name} onChange={(e) => setName(e.target.value)} maxLength={20} disabled={submitting} />
						</label>
						<label className="user-profile__edit-field">
							<span>자기소개</span>
							<textarea value={intro} onChange={(e) => setIntro(e.target.value)} rows={4} maxLength={500} placeholder="조금 더 자세한 자기소개" disabled={submitting} />
						</label>
					</div>

					{error && <p className="user-profile__edit-error">{error}</p>}

					<div className="user-profile__edit-footer">
						<button type="button" className="user-profile__edit-cancel" onClick={() => onOpenChange(false)} disabled={submitting}>취소</button>
						<button type="button" className="user-profile__edit-save" onClick={handleSubmit} disabled={submitting}>
							{submitting ? '저장 중...' : '저장'}
						</button>
					</div>
				</div>
			</DialogContent>
		</Dialog>
	);
}