import { Button } from '@nice/ui/components/button';
import { IconChevronLeft, IconChevronRight } from '@tabler/icons-react';
import { useArticlesContext } from './context';

export function ArticlePagination() {
	const { pagination, setCurrentPage } = useArticlesContext();

	const { currentPage, pageSize, totalPages, totalCount } = pagination;

	if (totalPages <= 1) {
		return null;
	}

	const startItem = (currentPage - 1) * pageSize + 1;
	const endItem = Math.min(currentPage * pageSize, totalCount || 0);

	// 生成页码数组
	const getPageNumbers = (): number[] => {
		const pages: number[] = [];
		const maxVisible = 5; // 最多显示5个页码

		if (totalPages <= maxVisible) {
			// 总页数不超过最大显示数，显示全部
			for (let i = 1; i <= totalPages; i++) {
				pages.push(i);
			}
		} else {
			// 总页数超过最大显示数，需要智能显示
			if (currentPage <= 3) {
				// 当前页在前面，显示前4页和最后一页
				for (let i = 1; i <= 4; i++) {
					pages.push(i);
				}
				pages.push(-1); // 省略号
				pages.push(totalPages);
			} else if (currentPage >= totalPages - 2) {
				// 当前页在后面，显示第一页和后4页
				pages.push(1);
				pages.push(-1); // 省略号
				for (let i = totalPages - 3; i <= totalPages; i++) {
					pages.push(i);
				}
			} else {
				// 当前页在中间，显示第一页、当前页前后各一页、最后一页
				pages.push(1);
				pages.push(-1); // 省略号
				for (let i = currentPage - 1; i <= currentPage + 1; i++) {
					pages.push(i);
				}
				pages.push(-2); // 省略号
				pages.push(totalPages);
			}
		}

		return pages;
	};

	return (
		<div className="flex items-center justify-between p-4 border-t bg-muted/10">
			<div className="text-sm text-muted-foreground">
				显示 {startItem} 到 {endItem} 项，共 {totalCount || 0} 项
			</div>
			<div className="flex items-center gap-2">
				<Button
					variant="outline"
					size="sm"
					onClick={() => setCurrentPage(currentPage - 1)}
					disabled={currentPage === 1}
					className="h-9 px-3"
				>
					<IconChevronLeft className="h-4 w-4 mr-1" />
					上一页
				</Button>

				<div className="flex items-center gap-1">
					{getPageNumbers().map((page, index) =>
						page === -1 || page === -2 ? (
							<span key={`ellipsis-${index}`} className="px-2 text-muted-foreground">
								...
							</span>
						) : (
							<Button
								key={page}
								variant={currentPage === page ? 'default' : 'outline'}
								size="sm"
								onClick={() => setCurrentPage(page)}
								className="h-9 w-9"
							>
								{page}
							</Button>
						),
					)}
				</div>

				<Button
					variant="outline"
					size="sm"
					onClick={() => setCurrentPage(currentPage + 1)}
					disabled={currentPage === totalPages}
					className="h-9 px-3"
				>
					下一页
					<IconChevronRight className="h-4 w-4 ml-1" />
				</Button>
			</div>
		</div>
	);
}