package authser

import (
	"fmt"
	"strings"
)

// SettingPageVM 账号设置页展示模型。
type SettingPageVM struct {
	UserID       int64
	AccountNo    string
	NickName     string
	Introduction string
	Email        string
	EmailMasked  string
	EmailBound    bool
	Avatar       string // 可用头像 URL；空则模板用默认图
	InviteCode   string
	PrivacyMode  bool
	VipType      int
	VipExpire    string
	Recharge     int64
	Score        int64
	DisplayName  string
}

// BuildSettingVM 由 LoginResp 构建设置页 VM。
func BuildSettingVM(user *LoginResp) SettingPageVM {
	if user == nil {
		return SettingPageVM{}
	}
	nick := strings.TrimSpace(user.NickName)
	account := strings.TrimSpace(user.AccountNo)
	email := strings.TrimSpace(user.Email)
	intro := strings.TrimSpace(user.Introduction)
	display := nick
	if display == "" {
		display = account
	}
	if display == "" {
		display = "用户"
	}
	return SettingPageVM{
		UserID:       user.UserID,
		AccountNo:    account,
		NickName:     nick,
		Introduction: intro,
		Email:        email,
		EmailMasked:  MaskEmail(email),
		EmailBound:    email != "",
		Avatar:       usableAvatarURL(user.Avatar),
		InviteCode:   strings.TrimSpace(user.InviteCode),
		PrivacyMode:  user.PrivacyMode,
		VipType:      user.VipType,
		VipExpire:    strings.TrimSpace(user.CurrentVipExpire),
		Recharge:     user.Recharge,
		Score:        user.Score,
		DisplayName:  display,
	}
}

// MaskEmail 邮箱脱敏，如 ab***@mail.com。
func MaskEmail(email string) string {
	email = strings.TrimSpace(email)
	if email == "" {
		return ""
	}
	at := strings.LastIndex(email, "@")
	if at <= 0 || at == len(email)-1 {
		return email
	}
	local := email[:at]
	domain := email[at:]
	runes := []rune(local)
	if len(runes) <= 2 {
		return string(runes[:1]) + "***" + domain
	}
	return string(runes[:2]) + "***" + domain
}

// FormatUserID 展示用 ID。
func FormatUserID(id int64) string {
	if id <= 0 {
		return ""
	}
	return fmt.Sprintf("%d", id)
}