package user

import (
	"context"
	"strings"

	"hyapp/pkg/xerr"
	userdomain "hyapp/services/user-service/internal/domain/user"
)

// UpdateUserProfile 修改用户名、头像和生日；国家修改走独立接口和冷却期。
func (s *Service) UpdateUserProfile(ctx context.Context, userID int64, username *string, avatar *string, birth *string) (userdomain.User, error) {
	if userID <= 0 {
		// user_id 必须来自 gateway 鉴权上下文，service 层仍兜底校验。
		return userdomain.User{}, xerr.New(xerr.InvalidArgument, "user_id is required")
	}
	username = trimmedStringPtr(username)
	avatar = trimmedStringPtr(avatar)
	birth = trimmedStringPtr(birth)
	if username == nil && avatar == nil && birth == nil {
		// PATCH 语义要求至少有一个字段，否则客户端通常是传参错误。
		return userdomain.User{}, xerr.New(xerr.InvalidArgument, "profile update field is required")
	}
	if username != nil && *username == "" {
		// 用户名是展示资料，禁止写成空字符串；头像和生日允许清空。
		return userdomain.User{}, xerr.New(xerr.InvalidArgument, "username is required")
	}
	if username != nil && userdomain.ProfileStringTooLong(*username, userdomain.ProfileUsernameMaxRunes) {
		// 提前按 users.username 的 VARCHAR 边界拒绝，避免把客户端错误暴露成 MySQL 错误。
		return userdomain.User{}, xerr.New(xerr.InvalidArgument, "username is too long")
	}
	if avatar != nil && *avatar != "" {
		if userdomain.ProfileStringTooLong(*avatar, userdomain.ProfileAvatarMaxRunes) {
			// 头像 URL 直接进入展示资料，长度错误必须稳定返回 INVALID_ARGUMENT。
			return userdomain.User{}, xerr.New(xerr.InvalidArgument, "avatar is too long")
		}
		if !userdomain.ValidProfileAvatarURL(*avatar) {
			// 非 HTTP(S) 或相对地址不应写入展示资料，避免客户端渲染和安全策略不一致。
			return userdomain.User{}, xerr.New(xerr.InvalidArgument, "avatar must be an absolute http or https URL")
		}
	}
	if birth != nil && *birth != "" {
		if !userdomain.ValidProfileBirthDate(*birth) {
			// 生日只保存日期，不接受时区或斜杠格式，避免客户端跨时区偏移。
			return userdomain.User{}, xerr.New(xerr.InvalidArgument, "birth must use yyyy-mm-dd")
		}
	}
	if s.userRepository == nil {
		return userdomain.User{}, xerr.New(xerr.Unavailable, "user repository is not configured")
	}

	return s.userRepository.UpdateUserProfile(ctx, userdomain.ProfileUpdateCommand{
		UserID:      userID,
		Username:    username,
		Avatar:      avatar,
		BirthDate:   birth,
		UpdatedAtMs: s.now().UnixMilli(),
	})
}

// ChangeUserCountry 修改用户国家并写审计日志；同一用户滚动 30 天内只能成功修改一次。
func (s *Service) ChangeUserCountry(ctx context.Context, userID int64, country string, requestID string) (userdomain.User, int64, error) {
	country = userdomain.NormalizeCountryCode(country)
	if userID <= 0 {
		return userdomain.User{}, 0, xerr.New(xerr.InvalidArgument, "user_id is required")
	}
	if country == "" {
		return userdomain.User{}, 0, xerr.New(xerr.InvalidArgument, "country is required")
	}
	if !userdomain.ValidCountryCode(country) {
		return userdomain.User{}, 0, xerr.New(xerr.InvalidArgument, "country must use 2 to 3 uppercase letters")
	}
	if s.userRepository == nil {
		return userdomain.User{}, 0, xerr.New(xerr.Unavailable, "user repository is not configured")
	}
	if s.countryRegionRepository == nil {
		return userdomain.User{}, 0, xerr.New(xerr.Unavailable, "country repository is not configured")
	}
	resolvedCountry, ok, err := s.countryRegionRepository.ResolveActiveCountryByCode(ctx, country)
	if err != nil {
		return userdomain.User{}, 0, err
	}
	if !ok {
		return userdomain.User{}, 0, xerr.New(xerr.InvalidArgument, "country is not supported")
	}
	var regionID int64
	if region, ok, err := s.countryRegionRepository.ResolveActiveRegionByCountry(ctx, resolvedCountry.CountryCode); err != nil {
		return userdomain.User{}, 0, err
	} else if ok {
		regionID = region.RegionID
	}

	nowMs := s.now().UnixMilli()
	return s.userRepository.ChangeUserCountry(ctx, userdomain.CountryChangeCommand{
		UserID:      userID,
		NewCountry:  resolvedCountry.CountryCode,
		NewRegionID: regionID,
		RequestID:   strings.TrimSpace(requestID),
		ChangedAtMs: nowMs,
		CooldownMs:  s.countryChangeCooldown.Milliseconds(),
	})
}

func trimmedStringPtr(value *string) *string {
	if value == nil {
		return nil
	}
	trimmed := strings.TrimSpace(*value)
	return &trimmed
}