import { clsx, type ClassValue } from 'clsx';

/**
 * 合并 className
 */
export function cn(...inputs: ClassValue[]): string {
  return clsx(inputs);
}

/**
 * 延迟函数
 */
export function delay(ms: number): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

/**
 * 防抖函数
 */
export function debounce<T extends (...args: Parameters<T>) => ReturnType<T>>(
  func: T,
  wait: number
): (...args: Parameters<T>) => void {
  let timeoutId: ReturnType<typeof setTimeout> | null = null;

  return function (this: ThisParameterType<T>, ...args: Parameters<T>) {
    if (timeoutId) {
      clearTimeout(timeoutId);
    }
    timeoutId = setTimeout(() => {
      func.apply(this, args);
    }, wait);
  };
}

/**
 * 节流函数
 */
export function throttle<T extends (...args: Parameters<T>) => ReturnType<T>>(
  func: T,
  limit: number
): (...args: Parameters<T>) => void {
  let inThrottle: boolean;

  return function (this: ThisParameterType<T>, ...args: Parameters<T>) {
    if (!inThrottle) {
      func.apply(this, args);
      inThrottle = true;
      setTimeout(() => (inThrottle = false), limit);
    }
  };
}

/**
 * 深拷贝
 */
export function deepClone<T>(obj: T): T {
  if (obj === null || typeof obj !== 'object') {
    return obj;
  }
  return JSON.parse(JSON.stringify(obj));
}

/**
 * 生成唯一 ID
 */
export function generateId(): string {
  return `${Date.now()}-${Math.random().toString(36).substring(2, 9)}`;
}

/**
 * 获取对象的嵌套值
 */
export function getNestedValue<T>(obj: Record<string, unknown>, path: string): T | undefined {
  const keys = path.split('.');
  let result: unknown = obj;

  for (const key of keys) {
    if (result === null || result === undefined) {
      return undefined;
    }
    result = (result as Record<string, unknown>)[key];
  }

  return result as T;
}

/**
 * 将对象转为查询字符串
 */
export function objectToQueryString(obj: Record<string, unknown>): string {
  const params = new URLSearchParams();

  Object.entries(obj).forEach(([key, value]) => {
    if (value !== undefined && value !== null && value !== '') {
      params.append(key, String(value));
    }
  });

  return params.toString();
}

/**
 * 从查询字符串解析对象
 */
export function queryStringToObject(query: string): Record<string, string> {
  const params = new URLSearchParams(query);
  const result: Record<string, string> = {};

  params.forEach((value, key) => {
    result[key] = value;
  });

  return result;
}

/**
 * 数组去重
 */
export function uniqueArray<T>(arr: T[], key?: keyof T): T[] {
  if (key) {
    const seen = new Set();
    return arr.filter((item) => {
      const k = item[key];
      if (seen.has(k)) {
        return false;
      }
      seen.add(k);
      return true;
    });
  }
  return [...new Set(arr)];
}

/**
 * 数组分组
 */
export function groupBy<T>(arr: T[], key: keyof T): Record<string, T[]> {
  return arr.reduce(
    (groups, item) => {
      const groupKey = String(item[key]);
      if (!groups[groupKey]) {
        groups[groupKey] = [];
      }
      groups[groupKey].push(item);
      return groups;
    },
    {} as Record<string, T[]>
  );
}

/**
 * 复制文本到剪贴板
 */
export async function copyToClipboard(text: string): Promise<boolean> {
  try {
    await navigator.clipboard.writeText(text);
    return true;
  } catch {
    // 降级方案
    const textarea = document.createElement('textarea');
    textarea.value = text;
    textarea.style.position = 'fixed';
    textarea.style.opacity = '0';
    document.body.appendChild(textarea);
    textarea.select();
    const success = document.execCommand('copy');
    document.body.removeChild(textarea);
    return success;
  }
}

/**
 * 下载 Blob 文件
 */
export function downloadBlob(blob: Blob, filename: string): void {
  const url = URL.createObjectURL(blob);
  const link = document.createElement('a');
  link.href = url;
  link.download = filename;
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
  URL.revokeObjectURL(url);
}

/**
 * 检查是否为移动设备
 */
export function isMobile(): boolean {
  if (typeof window === 'undefined') return false;
  return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
}

/**
 * 获取颜色列表（用于图表）
 */
export function getChartColors(): string[] {
  return [
    '#1565C0',
    '#4CAF50',
    '#F5A623',
    '#E53935',
    '#9C27B0',
    '#00BCD4',
    '#FF9800',
    '#795548',
    '#607D8B',
    '#3F51B5',
  ];
}