// Package service 定义业务逻辑层接口
package service

import (
	"context"
	"time"

	"carrotskin/internal/model"
	"carrotskin/pkg/storage"

	"go.uber.org/zap"
)

// UserService 用户服务接口
type UserService interface {
	// 用户认证
	Register(ctx context.Context, username, password, email, avatar string) (*model.User, string, error)
	Login(ctx context.Context, usernameOrEmail, password, ipAddress, userAgent string) (*model.User, string, error)

	// 用户查询
	GetByID(ctx context.Context, id int64) (*model.User, error)
	GetByEmail(ctx context.Context, email string) (*model.User, error)
	GetByUsername(ctx context.Context, username string) (*model.User, error)

	// 用户更新
	UpdateInfo(ctx context.Context, user *model.User) error
	UpdateAvatar(ctx context.Context, userID int64, avatarURL string) error
	ChangePassword(ctx context.Context, userID int64, oldPassword, newPassword string) error
	ResetPassword(ctx context.Context, email, newPassword string) error
	ChangeEmail(ctx context.Context, userID int64, newEmail string) error

	// 头像上传
	UploadAvatar(ctx context.Context, userID int64, fileData []byte, fileName string) (string, error)

	// URL验证
	ValidateAvatarURL(ctx context.Context, avatarURL string) error

	// 配置获取
	GetMaxProfilesPerUser() int
	GetMaxTexturesPerUser() int

	// 管理员操作
	ListUsers(ctx context.Context, page, pageSize int) ([]*model.User, int64, error)
	SetRole(ctx context.Context, userID int64, role string) error
	SetStatus(ctx context.Context, userID int64, status int16) error
}

// ProfileService 档案服务接口
type ProfileService interface {
	// 档案CRUD
	Create(ctx context.Context, userID int64, name string) (*model.Profile, error)
	GetByUUID(ctx context.Context, uuid string) (*model.Profile, error)
	GetByUserID(ctx context.Context, userID int64) ([]*model.Profile, error)
	Update(ctx context.Context, uuid string, userID int64, name *string, skinID, capeID *int64) (*model.Profile, error)
	Delete(ctx context.Context, uuid string, userID int64) error

	// 档案状态
	CheckLimit(ctx context.Context, userID int64, maxProfiles int) error

	// 批量查询
	GetByNames(ctx context.Context, names []string) ([]*model.Profile, error)
	GetByProfileName(ctx context.Context, name string) (*model.Profile, error)

	// ProfileSearchByName 按用户名批量查询档案，返回简化的 NameAndId 列表（文档 2.1）
	// 规范化（toLowerCase）、空名过滤、每页最多 maxBatch 个限制由本方法在服务端兜底处理。
	ProfileSearchByName(ctx context.Context, names []string, maxBatch int) ([]model.NameAndId, error)

	// ProfileSearchByNameSingle 按单个用户名查询档案，返回简化的 NameAndId（文档 2.2）
	// 未找到时返回 (nil, nil)，符合文档中"客户端返回 Optional.empty()"的契约。
	ProfileSearchByNameSingle(ctx context.Context, name string) (*model.NameAndId, error)
}

// TextureService 材质服务接口
type TextureService interface {
	// 材质CRUD
	UploadTexture(ctx context.Context, uploaderID int64, name, description, textureType string, fileData []byte, fileName string, isPublic, isSlim bool) (*model.Texture, error)
	GetByID(ctx context.Context, id int64) (*model.Texture, error)
	GetByHash(ctx context.Context, hash string) (*model.Texture, error)
	GetByUserID(ctx context.Context, uploaderID int64, page, pageSize int) ([]*model.Texture, int64, error)
	Search(ctx context.Context, keyword string, textureType model.TextureType, publicOnly bool, page, pageSize int) ([]*model.Texture, int64, error)
	Update(ctx context.Context, textureID, uploaderID int64, name, description string, isPublic *bool) (*model.Texture, error)
	Delete(ctx context.Context, textureID, uploaderID int64) error

	// 收藏
	ToggleFavorite(ctx context.Context, userID, textureID int64) (bool, error)
	GetUserFavorites(ctx context.Context, userID int64, page, pageSize int) ([]*model.Texture, int64, error)

	// 限制检查
	CheckUploadLimit(ctx context.Context, uploaderID int64, maxTextures int) error

	// 管理员操作
	ListForAdmin(ctx context.Context, page, pageSize int) ([]*model.Texture, int64, error)
	AdminDelete(ctx context.Context, textureID int64) error
	IncrementDownload(ctx context.Context, textureID int64) error
}

// TokenService 令牌服务接口
type TokenService interface {
	// 令牌管理
	Create(ctx context.Context, userID int64, uuid, clientToken string) (*model.Profile, []*model.Profile, string, string, error)
	CreateWithProfile(ctx context.Context, userID int64, profileUUID string, clientToken string) (*model.Profile, []*model.Profile, string, string, error)
	Validate(ctx context.Context, accessToken, clientToken string) bool
	Refresh(ctx context.Context, accessToken, clientToken, selectedProfileID string) (string, string, error)
	Invalidate(ctx context.Context, accessToken string)
	InvalidateUserTokens(ctx context.Context, userID int64)

	// 令牌查询
	GetUUIDByAccessToken(ctx context.Context, accessToken string) (string, error)
	GetUserIDByAccessToken(ctx context.Context, accessToken string) (int64, error)
}

// VerificationService 验证码服务接口
type VerificationService interface {
	SendCode(ctx context.Context, email, codeType string) error
	VerifyCode(ctx context.Context, email, code, codeType string) error
}

// CaptchaService 滑动验证码服务接口
type CaptchaService interface {
	Generate(ctx context.Context) (masterImg, tileImg, captchaID string, y int, err error)
	Verify(ctx context.Context, dx int, captchaID string) (bool, error)
	CheckVerified(ctx context.Context, captchaID string) (bool, error)
	ConsumeVerified(ctx context.Context, captchaID string) error
}

// YggdrasilService Yggdrasil服务接口
type YggdrasilService interface {
	// 用户认证
	GetUserIDByEmail(ctx context.Context, email string) (int64, error)
	VerifyPassword(ctx context.Context, password string, userID int64) error

	// 会话管理
	JoinServer(ctx context.Context, serverID, accessToken, selectedProfile, ip string) error
	HasJoinedServer(ctx context.Context, serverID, username, ip string) error

	// 密码管理
	ResetYggdrasilPassword(ctx context.Context, userID int64) (string, error)

	// 序列化
	SerializeProfile(ctx context.Context, profile model.Profile) map[string]interface{}
	SerializeProfileWithUnsigned(ctx context.Context, profile model.Profile, unsigned bool) map[string]interface{}
	SerializeUser(ctx context.Context, user *model.User, uuid string) map[string]interface{}

	// 证书
	GeneratePlayerCertificate(ctx context.Context, uuid string) (*PlayerCertificate, error)
	GetPublicKey(ctx context.Context) (string, error)
}

// FriendActionType 好友操作类型（文档 1.3.2）
type FriendActionType string

const (
	FriendActionAdd    FriendActionType = "ADD"
	FriendActionRemove FriendActionType = "REMOVE"
)

// FriendActionRequest 好友操作请求（文档 1.3.2）
type FriendActionRequest struct {
	Name       string           `json:"name,omitempty"`
	ProfileID  string           `json:"profileId,omitempty"`
	UpdateType FriendActionType `json:"updateType"`
}

// FriendDTO 好友条目（文档 1.3.1 FriendDto）
type FriendDTO struct {
	ProfileID string `json:"profileId"`
	Name      string `json:"name"`
}

// FriendsListResponse 好友列表响应（文档 1.3.1）
type FriendsListResponse struct {
	Friends          []FriendDTO `json:"friends"`
	IncomingRequests []FriendDTO `json:"incomingRequests"`
	OutgoingRequests []FriendDTO `json:"outgoingRequests"`
}

// PlayerAttributesRequest 玩家偏好更新请求（文档 1.2.2）
type PlayerAttributesRequest struct {
	ProfanityFilterPreferences *ProfanityFilterPreferences `json:"profanityFilterPreferences,omitempty"`
	FriendsPreferences         *FriendsPreferences         `json:"friendsPreferences,omitempty"`
}

// ProfanityFilterPreferences 脏词过滤偏好
type ProfanityFilterPreferences struct {
	ProfanityFilterOn *bool `json:"profanityFilterOn,omitempty"`
}

// FriendsPreferences 好友偏好
type FriendsPreferences struct {
	Friends       *string `json:"friends,omitempty"`       // ENABLED / DISABLED
	AcceptInvites *string `json:"acceptInvites,omitempty"` // ENABLED / DISABLED
}

// PlayerAttributesResponse 玩家属性响应（文档 1.2.1）
// 仅实现好友相关字段，其它（privileges/banStatus 等）不在好友系统范围
type PlayerAttributesResponse struct {
	ProfanityFilterPreferences ProfanityFilterPreferencesResp `json:"profanityFilterPreferences"`
	FriendsPreferences         FriendsPreferencesResp         `json:"friendsPreferences"`
	ChatPreferences            ChatPreferencesResp            `json:"chatPreferences"`
}

// ProfanityFilterPreferencesResp 脏词过滤偏好响应
type ProfanityFilterPreferencesResp struct {
	ProfanityFilterOn bool `json:"profanityFilterOn"`
}

// FriendsPreferencesResp 好友偏好响应
type FriendsPreferencesResp struct {
	Friends       string `json:"friends"`
	AcceptInvites string `json:"acceptInvites"`
}

// ChatPreferencesResp 聊天偏好响应
type ChatPreferencesResp struct {
	TextCommunication string `json:"textCommunication"`
}

// PresenceRequest 在线状态上报请求（文档 1.1）
type PresenceRequest struct {
	Status string `json:"status"`
}

// PresenceEntry 单个在线玩家状态（文档 1.1）
type PresenceEntry struct {
	ProfileID   string `json:"profileId"`
	PMID        string `json:"pmid,omitempty"`
	Status      string `json:"status"`
	LastUpdated string `json:"lastUpdated"`
}

// PresenceResponse 在线状态响应（文档 1.1）
type PresenceResponse struct {
	Presence []PresenceEntry `json:"presence"`
}

// BlockListResponse 屏蔽列表响应（文档 1.6）
type BlockListResponse struct {
	BlockedProfiles []string `json:"blockedProfiles"`
}

// FriendsService 好友系统服务接口（文档 1.1 / 1.2 / 1.3 / 1.6）
type FriendsService interface {
	// 好友列表与操作
	ListFriends(ctx context.Context, requesterUUID string) (*FriendsListResponse, error)
	PerformFriendAction(ctx context.Context, requesterUUID string, req FriendActionRequest) (*FriendsListResponse, error)

	// 玩家偏好属性
	GetAttributes(ctx context.Context, profileUUID string) (*PlayerAttributesResponse, error)
	UpdateAttributes(ctx context.Context, profileUUID string, req PlayerAttributesRequest) error

	// 在线状态
	UpdatePresence(ctx context.Context, requesterUUID string, status string) (*PresenceResponse, error)

	// 屏蔽列表
	GetBlocklist(ctx context.Context, blockerUUID string) (*BlockListResponse, error)
}

// SecurityService 安全服务接口
type SecurityService interface {
	// 登录安全
	CheckLoginLocked(ctx context.Context, identifier string) (bool, time.Duration, error)
	RecordLoginFailure(ctx context.Context, identifier string) (int, error)
	ClearLoginAttempts(ctx context.Context, identifier string) error
	GetRemainingLoginAttempts(ctx context.Context, identifier string) (int, error)

	// 验证码安全
	CheckVerifyLocked(ctx context.Context, email, codeType string) (bool, time.Duration, error)
	RecordVerifyFailure(ctx context.Context, email, codeType string) (int, error)
	ClearVerifyAttempts(ctx context.Context, email, codeType string) error
}

// Services 服务集合
type Services struct {
	User         UserService
	Profile      ProfileService
	Texture      TextureService
	Token        TokenService
	Verification VerificationService
	Captcha      CaptchaService
	Yggdrasil    YggdrasilService
	Security     SecurityService
	Friends      FriendsService
}

// ServiceDeps 服务依赖
type ServiceDeps struct {
	Logger  *zap.Logger
	Storage *storage.StorageClient
}