interface IUserInfo {
  id: string | number;
  name: string;
  officialEmail: string | null;
  officialNumber: string | null;
  role: 'STUDENT' | 'TEACHER' | 'ADMIN' | null;
  userAvatar: string | null;
  createTime: string | null;
  englishName: string | null;
  gender: 'MAN' | 'WOMAN' | null;
  birthday: string | null;
  phone: string | null;
  contentEmail: string | null;
  pid: string | number;
  openid: string | null;
  unionid: string | null;
  isWechatBound: boolean;
}
// 预设的渐变色方案
const gradientColors = [
  {
    primary: '#3498DB',
    secondary: '#5DADE2',
    name: 'ocean'
  },
  {
    primary: '#F39C12',
    secondary: '#F4D03F',
    name: 'sunset'
  },
  {
    primary: '#5DADE2',
    secondary: '#AED6F1',
    name: 'sky'
  },
  {
    primary: '#58D68D',
    secondary: '#82E0AA',
    name: 'forest'
  },
  {
    primary: '#E74C3C',
    secondary: '#F1948A',
    name: 'coral'
  }
]

// 渐变方向
const gradientDirections = [
  '135deg',
  '45deg',
  '225deg',
  '315deg'
]

/**
 * 基于用户信息生成一致的哈希值
 */
function generateUserHash(userInfo: IUserInfo): number {
  const hashString = `${userInfo.id || 0}-${userInfo.name || ''}-${userInfo.officialEmail || ''}`
  let hash = 0
  
  if (hashString.length === 0) return hash
  
  for (let i = 0; i < hashString.length; i++) {
    const char = hashString.charCodeAt(i)
    hash = ((hash << 5) - hash) + char
    hash = hash & hash // Convert to 32bit integer
  }
  
  return Math.abs(hash)
}

/**
 * 生成用户名的首字母显示
 */
function generateAvatarText(userInfo: IUserInfo): string {
  if (userInfo.name) {
    // 如果是中文名，取最后一个字
    if (/[\u4e00-\u9fa5]/.test(userInfo.name)) {
      return userInfo.name.slice(-1)
    }
    // 如果是英文名，取首字母
    return userInfo.name.charAt(0).toUpperCase()
  }
  
  if (userInfo.englishName) {
    return userInfo.englishName.charAt(0).toUpperCase()
  }
  
  if (userInfo.officialEmail) {
    return userInfo.officialEmail.charAt(0).toUpperCase()
  }
  
  return '☁️'
}

/**
 * 生成完整的默认头像配置
 * @param userInfo 用户信息
 * @returns 完整的头像配置对象
 */
export function generateDefaultAvatar(userInfo: IUserInfo) {
  const hash = generateUserHash(userInfo)
  
  // 基于哈希值选择颜色方案和方向
  const colorIndex = hash % gradientColors.length
  const directionIndex = hash % gradientDirections.length
  
  const selectedColor = gradientColors[colorIndex]
  const selectedDirection = gradientDirections[directionIndex]
  
  return {
    // 是否为默认头像
    isDefault: true,
    // 头像显示文字
    text: generateAvatarText(userInfo),
    // 渐变背景样式
    background: `linear-gradient(${selectedDirection}, ${selectedColor.primary} 0%, ${selectedColor.secondary} 100%)`,
    // 颜色信息
    colors: {
      primary: selectedColor.primary,
      secondary: selectedColor.secondary,
      name: selectedColor.name
    },
    // 渐变方向
    direction: selectedDirection,
    // 完整的样式对象（用于Vue组件）
    style: {
      background: `linear-gradient(${selectedDirection}, ${selectedColor.primary} 0%, ${selectedColor.secondary} 100%)`,
      color: '#ffffff',
      fontWeight: '600',
      textShadow: '0 2rpx 4rpx rgba(0, 0, 0, 0.1)'
    }
  }
}

/**
 * 获取用户头像配置（自定义头像或默认头像）
 * @param userInfo 用户信息
 * @returns 头像配置对象
 */
export function getUserAvatarConfig(userInfo: IUserInfo) {
  // 如果有自定义头像
  const isDefault = !userInfo.userAvatar || userInfo.userAvatar === 'default_avatar_url';
  if(isDefault){
	  // 返回默认头像配置
	  return generateDefaultAvatar(userInfo)
  }
	return {
	  isDefault: false,
	  src: userInfo.userAvatar,
	  text: '',
	  background: '',
	  style: {}
	}
}