'use client';

import { useState, useEffect } from 'react';
import { createPortal } from 'react-dom';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { faXmark } from '@fortawesome/free-solid-svg-icons';
import type { ChatSettings } from '@/types/chat';
import { fetchChatSettings, updateChatSettings } from '@/lib/api/chatSettings';

type Props = {
	onClose: () => void;
};

const TOGGLES: { key: keyof ChatSettings; label: string; desc: string }[] = [
	{ key: 'allowInvite', label: '초대 수신', desc: '다른 사용자의 대화 초대를 받습니다.' },
	{ key: 'allowWhisper', label: '귓속말 수신', desc: '다른 사용자의 귓속말을 받습니다.' },
	{ key: 'showFollowingOnline', label: '팔로잉 접속 표시', desc: '내가 팔로우한 사용자에게 접속 상태를 표시합니다.' }
];

// 수신설정 modal — 초대/귓속말/팔로잉 접속 표시 토글 (백엔드 회원설정 persist). 도크 overflow 회피 위해 portal.
export default function ChatReceiveModal({ onClose }: Props)
{
	const [settings, setSettings] = useState<ChatSettings>({ allowInvite: true, allowWhisper: true, showFollowingOnline: true });
	const [loading, setLoading] = useState(true);
	const [saving, setSaving] = useState(false);
	const [error, setError] = useState('');

	// 진입 시 현재 설정 로드
	useEffect(() => {
		let alive = true;

		fetchChatSettings().then((res) => {
			if (alive && res.data) {
				setSettings(res.data);
			}
		}).catch((err) => {
			if (alive) {
				setError(err instanceof Error ? err.message : '설정을 불러오지 못했습니다.');
			}
		}).finally(() => {
			if (alive) {
				setLoading(false);
			}
		});

		return () => {
			alive = false;
		};
	}, []);

	// ESC 로 닫기
	useEffect(() => {
		const onKey = (e: KeyboardEvent) => {
			if (e.key === 'Escape') {
				onClose();
			}
		};

		document.addEventListener('keydown', onKey);

		return () => {
			document.removeEventListener('keydown', onKey);
		};
	}, [onClose]);

	const toggle = (key: keyof ChatSettings) => {
		setSettings((prev) => ({ ...prev, [key]: !prev[key] }));
	};

	const handleSave = async () => {
		setSaving(true);
		setError('');

		try {
			await updateChatSettings(settings);
			onClose();
		} catch (err) {
			setError(err instanceof Error ? err.message : '저장에 실패했습니다.');
		} finally {
			setSaving(false);
		}
	};

	if (typeof document === 'undefined') {
		return null;
	}

	return createPortal(
		<div className='chat-modal' role='presentation' onMouseDown={onClose}>
			<div className='chat-modal__panel' role='dialog' aria-modal='true' aria-label='채팅 수신 설정' onMouseDown={(e) => e.stopPropagation()}>
				<div className='chat-modal__head'>
					<h2 className='chat-modal__title'>수신 설정</h2>
					<button type='button' className='chat-modal__close' onClick={onClose} aria-label='닫기' title='닫기'>
						<FontAwesomeIcon icon={faXmark} />
					</button>
				</div>

				<div className='chat-modal__body'>
					{loading ? (
						<div className='chat-modal__loading'>불러오는 중…</div>
					) : (
						TOGGLES.map((t) => (
							<label key={t.key} className='chat-toggle'>
								<span className='chat-toggle__text'>
									<span className='chat-toggle__label'>{t.label}</span>
									<span className='chat-toggle__desc'>{t.desc}</span>
								</span>
								<span className='chat-toggle__switch'>
									<input
										type='checkbox'
										role='switch'
										checked={settings[t.key]}
										onChange={() => toggle(t.key)}
										disabled={saving}
									/>
									<span className='chat-toggle__slider' aria-hidden='true' />
								</span>
							</label>
						))
					)}
					{error && <p className='chat-modal__error' role='alert'>{error}</p>}
				</div>

				<div className='chat-modal__foot'>
					<button type='button' className='chat-modal__btn chat-modal__btn--ghost' onClick={onClose} disabled={saving}>취소</button>
					<button type='button' className='chat-modal__btn chat-modal__btn--primary' onClick={handleSave} disabled={loading || saving}>
						{saving ? '저장 중…' : '저장'}
					</button>
				</div>
			</div>
		</div>,
		document.body
	);
}