package utils

import (
	"regexp"
	"strings"
)

// Validator 验证器
type Validator struct{}

// IsEmail 验证邮箱格式
func (v *Validator) IsEmail(email string) bool {
	pattern := `^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$`
	matched, _ := regexp.MatchString(pattern, email)
	return matched
}

// IsPhone 验证手机号格式
func (v *Validator) IsPhone(phone string) bool {
	pattern := `^1[3-9]\d{9}$`
	matched, _ := regexp.MatchString(pattern, phone)
	return matched
}

// IsUsername 验证用户名格式
func (v *Validator) IsUsername(username string) bool {
	// 用户名只能包含字母、数字、下划线，长度3-20
	pattern := `^[a-zA-Z0-9_]{3,20}$`
	matched, _ := regexp.MatchString(pattern, username)
	return matched
}

// IsPassword 验证密码强度
func (v *Validator) IsPassword(password string) bool {
	// 密码至少6位，包含字母和数字
	if len(password) < 6 {
		return false
	}

	hasLetter := regexp.MustCompile(`[a-zA-Z]`).MatchString(password)
	hasNumber := regexp.MustCompile(`[0-9]`).MatchString(password)

	return hasLetter && hasNumber
}

// IsURL 验证URL格式
func (v *Validator) IsURL(url string) bool {
	pattern := `^https?://[^\s/$.?#].[^\s]*$`
	matched, _ := regexp.MatchString(pattern, url)
	return matched
}

// IsEmpty 检查字符串是否为空
func (v *Validator) IsEmpty(str string) bool {
	return strings.TrimSpace(str) == ""
}

// IsValidRole 验证角色名称
func (v *Validator) IsValidRole(role string) bool {
	validRoles := []string{"admin", "user", "guest"}
	for _, validRole := range validRoles {
		if role == validRole {
			return true
		}
	}
	return false
}

// NewValidator 创建验证器实例
func NewValidator() *Validator {
	return &Validator{}
}