import type { Article } from '@fenghuo/common';


/**
 * 格式化数字显示
 */
export function formatNumber(num: number): string {
    if (num >= 10000) {
        return (num / 10000).toFixed(1) + 'w';
    }
    if (num >= 1000) {
        return (num / 1000).toFixed(1) + 'k';
    }
    return num.toString();
}

/**
 * 筛选文章
 */
export function filterArticles(
    articles: Article[],
    searchTerm: string,
    statusFilter: string,
    categoryFilter: string,
): Article[] {
    return articles.filter((article) => {
        const matchesSearch =
            article.title.toLowerCase().includes(searchTerm.toLowerCase()) ||
            article.excerpt?.toLowerCase().includes(searchTerm.toLowerCase()) ||
            (article.terms ?? []).some((term) => term.name.toLowerCase().includes(searchTerm.toLowerCase()));

        const matchesStatus = statusFilter === 'all' || article.status === statusFilter;

        const matchesCategory =
            categoryFilter === 'all' || (article.terms ?? []).some((term) => term.name === categoryFilter);

        return matchesSearch && matchesStatus && matchesCategory;
    });
}

/**
 * 排序文章
 */
export function sortArticles(articles: Article[], sortBy: string): Article[] {
    return [...articles].sort((a, b) => {
        switch (sortBy) {
            case 'created-desc':
                return new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime();
            case 'created-asc':
                return new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime();
            case 'published-desc':
                if (!a.publishedAt) return 1;
                if (!b.publishedAt) return -1;
                return new Date(b.publishedAt).getTime() - new Date(a.publishedAt).getTime();
            case 'published-asc':
                if (!a.publishedAt) return 1;
                if (!b.publishedAt) return -1;
                return new Date(a.publishedAt).getTime() - new Date(b.publishedAt).getTime();
            case 'title-asc':
                return a.title.localeCompare(b.title);
            case 'title-desc':
                return b.title.localeCompare(a.title);
            case 'views-desc':
                return b.viewCount - a.viewCount;
            case 'views-asc':
                return a.viewCount - b.viewCount;
            default:
                return 0;
        }
    });
}

/**
 * 获取唯一分类列表
 */
export function getUniqueCategories(articles: Article[]): string[] {
    const all: string[] = [];
    articles.forEach((a) => {
        if (a.terms) all.push(...a.terms.map((t) => t.name));
    });
    return Array.from(new Set(all));
}

/**
 * 分页处理
 */
export function paginateArray<T>(array: T[], page: number, pageSize: number): T[] {
    return array.slice((page - 1) * pageSize, page * pageSize);
}

/**
 * 计算总页数
 */
export function calculateTotalPages(totalItems: number, pageSize: number): number {
    return Math.ceil(totalItems / pageSize);
}