import { type ClassValue, clsx } from 'clsx'
import { twMerge } from 'tailwind-merge'

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

export function sleep(ms: number = 1000) {
  return new Promise((resolve) => setTimeout(resolve, ms))
}

/**
 * 清理 CSS 变量名，替换特殊字符
 * 用于将模型名称（如 gpt-3.5-turbo）转换为有效的 CSS 变量名（gpt-3-5-turbo）
 * @param name - 原始名称
 * @returns 清理后的 CSS 变量名
 */
export function sanitizeCssVariableName(name: string): string {
  // 将点号、空格、斜杠替换为连字符
  // 移除其他不允许在 CSS 变量名中的特殊字符
  return name.replace(/[.\s/]/g, '-').replace(/[^\w-]/g, '')
}

/**
 * Generates page numbers for pagination with ellipsis
 * @param currentPage - Current page number (1-based)
 * @param totalPages - Total number of pages
 * @returns Array of page numbers and ellipsis strings
 *
 * Examples:
 * - Small dataset (≤5 pages): [1, 2, 3, 4, 5]
 * - Near beginning: [1, 2, 3, 4, '...', 10]
 * - In middle: [1, '...', 4, 5, 6, '...', 10]
 * - Near end: [1, '...', 7, 8, 9, 10]
 */
export function getPageNumbers(currentPage: number, totalPages: number) {
  const maxVisiblePages = 5 // Maximum number of page buttons to show
  const rangeWithDots = []

  if (totalPages <= maxVisiblePages) {
    // If total pages is 5 or less, show all pages
    for (let i = 1; i <= totalPages; i++) {
      rangeWithDots.push(i)
    }
  } else {
    // Always show first page
    rangeWithDots.push(1)

    if (currentPage <= 3) {
      // Near the beginning: [1] [2] [3] [4] ... [10]
      for (let i = 2; i <= 4; i++) {
        rangeWithDots.push(i)
      }
      rangeWithDots.push('...', totalPages)
    } else if (currentPage >= totalPages - 2) {
      // Near the end: [1] ... [7] [8] [9] [10]
      rangeWithDots.push('...')
      for (let i = totalPages - 3; i <= totalPages; i++) {
        rangeWithDots.push(i)
      }
    } else {
      // In the middle: [1] ... [4] [5] [6] ... [10]
      rangeWithDots.push('...')
      for (let i = currentPage - 1; i <= currentPage + 1; i++) {
        rangeWithDots.push(i)
      }
      rangeWithDots.push('...', totalPages)
    }
  }

  return rangeWithDots
}

/**
 * Truncate text to a maximum length with ellipsis
 */
export function truncateText(text: string, maxLength: number): string {
  if (!text || text.length <= maxLength) return text
  return text.slice(0, maxLength) + '...'
}

/**
 * Try to parse and pretty-print JSON, fallback to original text if invalid
 * @param text - Text that might be JSON
 * @returns Pretty-printed JSON or original text
 */
export function tryPrettyJson(text: string): string {
  const raw = (text ?? '').toString().trim()
  if (!raw) return ''
  try {
    return JSON.stringify(JSON.parse(raw), null, 2)
  } catch {
    return raw
  }
}
