package errors

import (
	"errors"
	"fmt"
	"time"

	pb "github.com/topfans/backend/pkg/proto/common"
)

// 业务错误类型
var (
	ErrUserNotFound            = errors.New("user not found")
	ErrUserAlreadyExists       = errors.New("user already exists")
	ErrInvalidPassword         = errors.New("invalid password")
	ErrInvalidToken            = errors.New("invalid token")
	ErrTokenExpired            = errors.New("token expired")
	ErrTokenMismatch           = errors.New("token mismatch")
	ErrUserInactive            = errors.New("user is inactive")
	ErrFanProfileNotFound      = errors.New("fan profile not found")
	ErrFanProfileAlreadyExists = errors.New("fan profile already exists")
	ErrNicknameAlreadyExists   = errors.New("该昵称已被注册")
	ErrInvalidNickname         = errors.New("invalid nickname format")
	ErrStarNotFound            = errors.New("star not found")
	ErrInvalidMobile           = errors.New("invalid mobile format")
	ErrPasswordTooShort        = errors.New("password too short")
	ErrInvalidStarID           = errors.New("invalid star_id")
	ErrInvalidUserID           = errors.New("invalid user_id")
	ErrMaxIdentitiesReached    = errors.New("maximum number of identities reached")
	ErrInternalServer          = errors.New("internal server error")

	// 社交服务相关错误
	ErrCannotAddSelf           = errors.New("不能添加自己为好友")
	ErrCannotSearchSelf        = errors.New("不能查找自己")
	ErrNotFanOfStar            = errors.New("对方不是该明星的粉丝")
	ErrAlreadyFriends          = errors.New("你们已经是好友了")
	ErrRequestAlreadyPending   = errors.New("已有待处理的好友请求")
	ErrRequestInCooldown       = errors.New("请求已被拒绝，请稍后再试")
	ErrInvalidFriendUserID     = errors.New("friend_user_id不能为空")
	ErrFriendRequestNotFound   = errors.New("好友请求不存在")
	ErrCannotProcessOwnRequest = errors.New("不能处理自己发送的请求")
	ErrRequestAlreadyProcessed = errors.New("该请求已被处理")
	ErrRequestExpired          = errors.New("好友请求已过期")
	ErrInvalidAction           = errors.New("无效的操作")
	ErrNotFriends              = errors.New("你们不是好友")
	ErrMaxFriendsReached      = errors.New("已达到最大好友数量限制")

	// 资产服务相关错误
	ErrAssetNotFound          = errors.New("资产不存在")
	ErrMintOrderNotFound      = errors.New("铸造订单不存在")
	ErrInsufficientCrystal    = errors.New("水晶余额不足")
	ErrInsufficientMintTimes  = errors.New("铸造次数不足")
	ErrAssetAccessDenied      = errors.New("无权访问该资产")
	ErrMintOrderAccessDenied  = errors.New("无权访问该订单")
	ErrInvalidAssetStatus     = errors.New("资产状态无效")
	ErrInvalidMintOrderStatus = errors.New("订单状态无效")

	// 账号状态相关错误
	ErrAccountFrozen         = errors.New("账号已被冻结")
	ErrAccountBanned        = errors.New("账号已被封禁")

	// 活动服务相关错误
	ErrActivityNotFound  = errors.New("活动不存在")
	ErrActivityItemNotFound = errors.New("活动道具不存在")

	// 星册服务相关错误
	ErrCollectionAssetNotFound  = errors.New("典藏藏品不存在")
	ErrActivityAssetNotFound    = errors.New("活动藏品不存在")
	ErrAssetRegistryNotFound    = errors.New("资产索引不存在")
	ErrInvalidAssetType         = errors.New("无效的资产类型")
)

// ToStatusCode 将错误转换为Proto状态码
func ToStatusCode(err error) pb.StatusCode {
	if err == nil {
		return pb.StatusCode_STATUS_OK
	}

	switch err {
	case ErrUserNotFound, ErrFanProfileNotFound, ErrStarNotFound:
		return pb.StatusCode_STATUS_NOT_FOUND
	case ErrUserAlreadyExists, ErrFanProfileAlreadyExists, ErrNicknameAlreadyExists:
		return pb.StatusCode_STATUS_BAD_REQUEST
	case ErrInvalidPassword, ErrInvalidToken, ErrTokenExpired, ErrTokenMismatch:
		return pb.StatusCode_STATUS_UNAUTHORIZED
	case ErrAccountFrozen, ErrAccountBanned:
		return pb.StatusCode_STATUS_FORBIDDEN
	case ErrInvalidMobile, ErrPasswordTooShort, ErrInvalidStarID, ErrInvalidUserID, ErrMaxIdentitiesReached, ErrInvalidNickname:
		return pb.StatusCode_STATUS_BAD_REQUEST
	case ErrCannotAddSelf, ErrCannotSearchSelf, ErrNotFanOfStar, ErrAlreadyFriends,
		ErrRequestAlreadyPending, ErrInvalidFriendUserID, ErrCannotProcessOwnRequest,
		ErrRequestAlreadyProcessed, ErrRequestExpired, ErrInvalidAction, ErrNotFriends:
		return pb.StatusCode_STATUS_BAD_REQUEST
	case ErrRequestInCooldown:
		return pb.StatusCode_STATUS_TOO_MANY_REQUESTS
	case ErrFriendRequestNotFound, ErrAssetNotFound, ErrMintOrderNotFound:
		return pb.StatusCode_STATUS_NOT_FOUND
	case ErrInsufficientCrystal, ErrInsufficientMintTimes, ErrInvalidAssetStatus, ErrInvalidMintOrderStatus:
		return pb.StatusCode_STATUS_BAD_REQUEST
	case ErrAssetAccessDenied, ErrMintOrderAccessDenied:
		return pb.StatusCode_STATUS_FORBIDDEN
	case ErrActivityNotFound, ErrActivityItemNotFound, ErrCollectionAssetNotFound, ErrActivityAssetNotFound, ErrAssetRegistryNotFound:
		return pb.StatusCode_STATUS_NOT_FOUND
	case ErrInvalidAssetType:
		return pb.StatusCode_STATUS_BAD_REQUEST
	default:
		return pb.StatusCode_STATUS_INTERNAL_ERROR
	}
}

// FormatErrorResponse 格式化错误响应
func FormatErrorResponse(err error) *pb.BaseResponse {
	if err == nil {
		return &pb.BaseResponse{
			Code:      pb.StatusCode_STATUS_OK,
			Message:   "",
			Timestamp: getCurrentTimestamp(),
		}
	}

	return &pb.BaseResponse{
		Code:      ToStatusCode(err),
		Message:   err.Error(),
		Timestamp: getCurrentTimestamp(),
	}
}

// FormatSuccessResponse 格式化成功响应
func FormatSuccessResponse() *pb.BaseResponse {
	return &pb.BaseResponse{
		Code:      pb.StatusCode_STATUS_OK,
		Message:   "",
		Timestamp: getCurrentTimestamp(),
	}
}

// BuildBaseResponse 构建基础响应（FormatErrorResponse的别名）
func BuildBaseResponse(err error) *pb.BaseResponse {
	return FormatErrorResponse(err)
}

// NewError 创建新的业务错误
func NewError(code pb.StatusCode, message string) error {
	return fmt.Errorf("%s", message)
}

// NewRequestInCooldownError 创建冷静期错误，包含剩余天数
func NewRequestInCooldownError(days int) error {
	return fmt.Errorf("请求已被拒绝，请 %d 天后再试", days)
}

// BuildBaseResponseWithMessage 构建带有自定义消息的响应
func BuildBaseResponseWithMessage(code pb.StatusCode, message string) *pb.BaseResponse {
	return &pb.BaseResponse{
		Code:      code,
		Message:   message,
		Timestamp: getCurrentTimestamp(),
	}
}

// getCurrentTimestamp 获取当前时间戳（毫秒）
func getCurrentTimestamp() int64 {
	return time.Now().UnixMilli()
}