package common

import (
	"errors"
	"regexp"
)

// SmsProvider defines the interface for SMS providers
type SmsProvider interface {
	SendCode(phone string, code string) error
}

var smsProviders = map[string]SmsProvider{}

// RegisterSmsProvider registers an SMS provider by name
func RegisterSmsProvider(name string, provider SmsProvider) {
	smsProviders[name] = provider
}

// SendSMS sends a verification code via the configured SMS provider
func SendSMS(phone string, code string) error {
	if SMSProvider == "" {
		return errors.New("SMS provider not configured")
	}
	provider, ok := smsProviders[SMSProvider]
	if !ok {
		return errors.New("unknown SMS provider: " + SMSProvider)
	}
	return provider.SendCode(phone, code)
}

var chinesePhoneRegex = regexp.MustCompile(`^1[3-9]\d{9}$`)

// IsValidPhone checks if the phone number is a valid Chinese mobile number
func IsValidPhone(phone string) bool {
	return chinesePhoneRegex.MatchString(phone)
}