'use client';

import { useCallback, useEffect, useMemo, useState } from 'react';
import Link from 'next/link';
import { Search } from 'lucide-react';
import { fetchApi, getDateTime } from '@/lib/utils/client';
import Loading from '@/app/component/Loading';
import Pagination from '@/app/component/Pagination';
import NavTabs from '../navTabs';
import {
	ORDER_STATUS_LABEL,
	SHIPMENT_STATUS_LABEL,
	type OrderListResponse,
	type OrderListRow,
	type OrderStatus
} from '@/types/store';

const PER_PAGE = 20;

type FilterMode = 'recent6m' | number;

function statusBadgeClass(status: OrderStatus): string
{
	if (status === 5) {
		return 'bg-green-100 text-green-800 dark:bg-green-900/40 dark:text-green-300';
	}
	if (status === 6) {
		return 'bg-neutral-200 text-neutral-700 dark:bg-neutral-700 dark:text-neutral-300';
	}
	if (status === 7 || status === 8) {
		return 'bg-amber-100 text-amber-800 dark:bg-amber-900/40 dark:text-amber-300';
	}
	return 'bg-blue-100 text-blue-800 dark:bg-blue-900/40 dark:text-blue-300';
}

export default function OrdersPage()
{
	const [orders, setOrders] = useState<OrderListRow[]>([]);
	const [total, setTotal] = useState(0);
	const [page, setPage] = useState(1);
	const [loading, setLoading] = useState(true);

	const [filterMode, setFilterMode] = useState<FilterMode>('recent6m');
	const [keywordInput, setKeywordInput] = useState('');
	const [appliedKeyword, setAppliedKeyword] = useState('');

	const yearChips = useMemo(() => {
		const current = new Date().getFullYear();
		return Array.from({ length: 6 }, (_, i) => current - i);
	}, []);

	const load = useCallback(async () => {
		setLoading(true);
		const params = new URLSearchParams();
		params.set('page', String(page));
		params.set('perPage', String(PER_PAGE));

		if (typeof filterMode === 'number') {
			params.set('year', String(filterMode));
		}

		if (appliedKeyword) {
			params.set('keyword', appliedKeyword);
		}

		const res = await fetchApi<OrderListResponse>(`/api/store/orders?${params.toString()}`, { silent: true });

		if (res.success && res.data) {
			setOrders(res.data.list);
			setTotal(res.data.total);
		}
		else {
			setOrders([]);
			setTotal(0);
		}

		setLoading(false);
	}, [filterMode, appliedKeyword, page]);

	useEffect(() => {
		load();
	}, [load]);

	useEffect(() => {
		setPage(1);
	}, [filterMode, appliedKeyword]);

	const handleSearch = () => {
		setAppliedKeyword(keywordInput.trim());
	};

	const handleKeywordKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
		if (e.key === 'Enter') {
			e.preventDefault();
			handleSearch();
		}
	};

	const handleChipClick = (mode: FilterMode) => {
		setFilterMode(mode);
	};

	const chipClass = (active: boolean): string => active
		? 'border border-blue-600 bg-blue-600 text-white'
		: 'border border-neutral-300 text-neutral-700 hover:bg-neutral-50 dark:border-neutral-700 dark:text-neutral-300 dark:hover:bg-neutral-800';

	return (
		<>
			<NavTabs />

			<div className="px-4 pb-8 sm:px-8">
				<h1 className="text-2xl font-bold mb-4">주문목록</h1>

				{/* 상품 검색 */}
				<div className="relative mb-3 w-full sm:max-w-md">
					<input
						type="search"
						value={keywordInput}
						onChange={(e) => { setKeywordInput(e.target.value); }}
						onKeyDown={handleKeywordKeyDown}
						placeholder="주문한 상품을 검색할 수 있어요!"
						className="w-full border border-neutral-300 dark:border-neutral-700 rounded-md px-4 py-2.5 pr-10 text-sm bg-white dark:bg-neutral-900"
						maxLength={100}
					/>
					<button
						type="button"
						onClick={handleSearch}
						aria-label="검색"
						className="absolute right-2 top-1/2 -translate-y-1/2 p-1.5 text-neutral-400 hover:text-blue-600"
					>
						<Search className="size-5" />
					</button>
				</div>

				{/* 기간 필터 칩 */}
				<div className="flex flex-wrap gap-1.5 mb-4">
					<button
						type="button"
						onClick={() => { handleChipClick('recent6m'); }}
						className={`px-3 py-1.5 text-xs font-medium rounded-md transition-colors ${chipClass(filterMode === 'recent6m')}`}
					>
						최근 6개월
					</button>
					{yearChips.map((y) => (
						<button
							key={y}
							type="button"
							onClick={() => { handleChipClick(y); }}
							className={`px-3 py-1.5 text-xs font-medium rounded-md transition-colors ${chipClass(filterMode === y)}`}
						>
							{y}
						</button>
					))}
				</div>

				<div className="text-sm text-neutral-500 mb-3">총 {total.toLocaleString()}건</div>

				{loading ? (
					<Loading />
				) : orders.length === 0 ? (
					<div className="text-center py-20 text-neutral-500">주문 내역이 없습니다.</div>
				) : (
					<>
						<div className="space-y-3">
							{orders.map((o) => (
								<div key={o.id} className="border border-neutral-200 dark:border-neutral-800 rounded-lg p-4 bg-white dark:bg-neutral-900">
									<div className="flex items-center justify-between mb-3 pb-2 border-b border-neutral-100 dark:border-neutral-800">
										<Link
											href={`/orders/${o.id}`}
											className="text-xs font-mono font-semibold text-blue-600 dark:text-blue-400 hover:underline"
										>
											{o.orderNumber}
										</Link>
										<div className="flex items-center gap-1.5">
											<span className={`px-2 py-0.5 rounded text-xs font-semibold ${statusBadgeClass(o.status)}`}>
												{ORDER_STATUS_LABEL[o.status]}
											</span>
											{o.shipmentStatus !== null && o.shipmentStatus !== undefined && (
												<span className="px-2 py-0.5 rounded text-xs bg-neutral-100 text-neutral-700 dark:bg-neutral-800 dark:text-neutral-300">
													배송 {SHIPMENT_STATUS_LABEL[o.shipmentStatus]}
												</span>
											)}
											{o.hasActiveRefundRequest && (
												<span className="px-2 py-0.5 rounded text-xs bg-amber-100 text-amber-800 dark:bg-amber-900/40 dark:text-amber-300">
													환불 요청 진행중
												</span>
											)}
										</div>
									</div>

									<Link href={`/orders/${o.id}`} className="flex items-center gap-4 hover:bg-neutral-50 dark:hover:bg-neutral-800/40 rounded p-1 -m-1">
										<div className="w-20 h-20 bg-neutral-100 dark:bg-neutral-800 rounded overflow-hidden flex items-center justify-center flex-shrink-0">
											{o.firstItemThumbnail ? (
												// eslint-disable-next-line @next/next/no-img-element
												<img src={o.firstItemThumbnail} alt="" className="w-full h-full object-cover" />
											) : (
												<span className="text-neutral-400 text-xs">no img</span>
											)}
										</div>
										<div className="flex-1 min-w-0">
											<div className="text-sm font-semibold truncate">
												{o.firstItemName}
												{o.itemCount > 1 && <span className="text-neutral-500 font-normal"> 외 {o.itemCount - 1}건</span>}
											</div>
											<div className="text-xs text-neutral-500 mt-1">
												총 {o.itemCount}개 상품
												{o.channelName && <span className="ml-2">• 후원 {o.channelName}</span>}
											</div>
											<div className="text-xs text-neutral-500 mt-1">
												주문 {getDateTime(o.createdAt)}
											</div>
										</div>
										<div className="text-right flex-shrink-0">
											<div className="text-xs text-neutral-500">결제 금액</div>
											<div className="text-lg font-bold text-red-600 dark:text-red-400">
												{o.totalAmount.toLocaleString()}P
											</div>
										</div>
									</Link>
								</div>
							))}
						</div>

						<Pagination total={total} page={page} perPage={PER_PAGE} onChange={setPage} />
					</>
				)}
			</div>
		</>
	);
}