package dto

import (
	pb "github.com/topfans/backend/pkg/proto/user"
)

// ========== 基础转换函数 ==========

// ToFanIdentityDTO 转换为粉丝身份信息
func ToFanIdentityDTO(star *pb.Star) FanIdentityDTO {
	return FanIdentityDTO{
		StarID:     star.StarId,
		IdentityID: star.IdentityId, // "wyb"
		Name:       star.Name,       // "王一博"（原始名称）
		Tag:        star.Tag,        // "小摩托"（昵称标签）
	}
}

// ToCurrentIdentityDTO 转换为当前身份详情
func ToCurrentIdentityDTO(profile *pb.FanProfile, star *pb.Star) CurrentIdentityDTO {
	return CurrentIdentityDTO{
		StarId:          star.StarId,
		IdentityID:      star.IdentityId, // "wyb"
		IdentityName:    star.Name,       // "王一博"
		Tag:             star.Tag,        // "小摩托"
		Level:           profile.Level,
		CrystalBalance:  profile.CrystalBalance,
	}
}

// ToUserWithIdentityDTO 转换为用户信息（含身份）
func ToUserWithIdentityDTO(user *pb.User, profile *pb.FanProfile, star *pb.Star) UserWithIdentityDTO {
	dto := UserWithIdentityDTO{
		UID:            user.Id, // uid 使用数据库ID
		Nickname:       profile.Nickname,
		FanLevel:       profile.Level,
		StarbookLimit:  profile.StarbookLimit,
		SlotLimit:      profile.SlotLimit,
		AssetsNum:      profile.AssetsCount, // assets_count → assets_num
		CrystalBalance: profile.CrystalBalance,
	}

	// 头像URL（优先使用粉丝档案中的头像，没有则使用用户头像）
	if profile.AvatarUrl != "" {
		dto.AvatarURL = profile.AvatarUrl
	} else if user.AvatarUrl != "" {
		dto.AvatarURL = user.AvatarUrl
	}

	// 链地址
	if profile.ChainAddress != "" {
		dto.ChainAddress = profile.ChainAddress
	}

	// 粉丝身份
	if star != nil {
		dto.FanIdentity = ToFanIdentityDTO(star)
	}

	// 脱敏手机号：139****0001
	if user.Mobile != "" && len(user.Mobile) == 11 {
		dto.MobileMasked = user.Mobile[:3] + "****" + user.Mobile[7:]
	}

	return dto
}

// ========== 认证相关转换 ==========

// ToRegisterResponseDTO 转换为注册响应
func ToRegisterResponseDTO(
	accessToken string,
	expiresIn int64,
	user *pb.User,
	profile *pb.FanProfile,
	star *pb.Star,
) RegisterResponseDTO {
	return RegisterResponseDTO{
		AccessToken: accessToken,
		ExpiresIn:   expiresIn,
		User:        ToUserWithIdentityDTO(user, profile, star),
	}
}

// ToLoginResponseDTO 转换为登录响应
func ToLoginResponseDTO(
	accessToken string,
	expiresIn int64,
	refreshToken string,
	user *pb.User,
	profile *pb.FanProfile,
	star *pb.Star,
) LoginResponseDTO {
	return LoginResponseDTO{
		AccessToken:  accessToken,
		ExpiresIn:    expiresIn,
		RefreshToken: refreshToken,
		User:         ToUserWithIdentityDTO(user, profile, star),
	}
}

// ToGetMeResponseDTO 转换为 GetMe 响应
func ToGetMeResponseDTO(user *pb.User, profile *pb.FanProfile, star *pb.Star) GetMeResponseDTO {
	dto := GetMeResponseDTO{
		UID:             user.Id,
		Nickname:        profile.Nickname,
		CurrentIdentity: ToCurrentIdentityDTO(profile, star),
	}

	// 头像URL（优先使用粉丝档案中的头像，没有则使用用户头像）
	if profile.AvatarUrl != "" {
		dto.AvatarURL = profile.AvatarUrl
	} else if user.AvatarUrl != "" {
		dto.AvatarURL = user.AvatarUrl
	}

	if profile.ChainAddress != "" {
		dto.ChainAddress = profile.ChainAddress
	}

	return dto
}

// ========== 个人信息相关转换 ==========

// ToProfileResponseDTO 转换为个人信息响应
func ToProfileResponseDTO(user *pb.User, profile *pb.FanProfile, star *pb.Star) ProfileResponseDTO {
	dto := ProfileResponseDTO{
		UID:            user.Id,
		Nickname:       profile.Nickname,
		FanLevel:       profile.Level,
		StarbookLimit:  profile.StarbookLimit,
		SlotLimit:      profile.SlotLimit,
		AssetsNum:      profile.AssetsCount,
		CrystalBalance: profile.CrystalBalance,
	}

	if profile.ChainAddress != "" {
		dto.ChainAddress = profile.ChainAddress
	}

	if star != nil {
		dto.FanIdentity = ToFanIdentityDTO(star)
	}

	return dto
}

// ToUpdateNicknameResponseDTO 转换为更新昵称响应
func ToUpdateNicknameResponseDTO(nickname string) UpdateNicknameResponseDTO {
	return UpdateNicknameResponseDTO{
		Nickname: nickname,
	}
}

// ========== 粉丝身份相关转换 ==========

// ToFanIdentityListItemDTO 转换为粉丝身份列表项
func ToFanIdentityListItemDTO(star *pb.Star) FanIdentityListItemDTO {
	dto := FanIdentityListItemDTO{
		StarID:     star.StarId,     // 88（star 的主键 ID）
		IdentityID: star.IdentityId, // "wyb"
		Name:       star.Name,       // "王一博"（原始名称）
		Tag:        star.Tag,        // "小摩托"（昵称标签）
	}

	if star.PicUrl != "" {
		dto.PicURL = star.PicUrl
	}

	return dto
}

// ToFanIdentityListResponseDTO 转换为粉丝身份列表响应（所有可用明星）
func ToFanIdentityListResponseDTO(stars []*pb.Star) FanIdentityListResponseDTO {
	items := make([]FanIdentityListItemDTO, 0, len(stars))
	for _, star := range stars {
		items = append(items, ToFanIdentityListItemDTO(star))
	}

	return FanIdentityListResponseDTO{
		Items: items,
		Total: len(items),
	}
}

// ToMyFanIdentitiesResponseDTO 转换为我的粉丝身份列表响应
func ToMyFanIdentitiesResponseDTO(items []*pb.MyFanIdentityItem, currentStarID int64) MyFanIdentitiesResponseDTO {
	dtoItems := make([]MyFanIdentityItemDTO, 0, len(items))
	for _, item := range items {
		profile := item.FanProfile
		star := item.Star

		dtoItems = append(dtoItems, MyFanIdentityItemDTO{
			StarID:         profile.StarId,
			IdentityID:     star.IdentityId,
			StarName:       star.Name,
			StarTag:        star.Tag,
			Nickname:       profile.Nickname,
			Level:          profile.Level,
			Experience:     profile.Experience,
			CrystalBalance: profile.CrystalBalance,
			IsActive:       profile.StarId == currentStarID,
		})
	}

	return MyFanIdentitiesResponseDTO{
		Items:         dtoItems,
		Total:         len(dtoItems),
		CurrentStarID: currentStarID,
	}
}

// ToAddIdentityResponseDTO 转换为添加身份响应
func ToAddIdentityResponseDTO(identityID string) AddIdentityResponseDTO {
	return AddIdentityResponseDTO{
		Bound:      true,
		IdentityID: identityID,
	}
}

// ToSwitchIdentityResponseDTO 转换为切换身份响应
func ToSwitchIdentityResponseDTO(
	accessToken string,
	expiresIn int64,
	profile *pb.FanProfile,
	star *pb.Star,
) SwitchIdentityResponseDTO {
	return SwitchIdentityResponseDTO{
		AccessToken:     accessToken,
		ExpiresIn:       expiresIn,
		CurrentIdentity: ToCurrentIdentityDTO(profile, star),
	}
}

// ========== 辅助函数 ==========

// getStarDisplayName 获取明星显示名称（优先使用 tag）
func getStarDisplayName(star *pb.Star) string {
	if star.Tag != "" {
		return star.Tag
	}
	return star.Name
}