package handler

import (
	"bytes"
	"carrotskin/internal/model"
	"carrotskin/internal/service"
	"carrotskin/pkg/database"
	"carrotskin/pkg/logger"
	"carrotskin/pkg/redis"
	"carrotskin/pkg/utils"
	"io"
	"net/http"
	"regexp"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

// 常量定义
const (
	ErrInternalServer = "服务器内部错误"
	// 错误类型
	ErrInvalidEmailFormat = "邮箱格式不正确"
	ErrInvalidPassword    = "密码必须至少包含8个字符，只能包含字母、数字和特殊字符"
	ErrWrongPassword      = "密码错误"
	ErrUserNotMatch       = "用户不匹配"

	// 错误消息
	ErrInvalidRequest      = "请求格式无效"
	ErrJoinServerFailed    = "加入服务器失败"
	ErrServerIDRequired    = "服务器ID不能为空"
	ErrUsernameRequired    = "用户名不能为空"
	ErrSessionVerifyFailed = "会话验证失败"
	ErrProfileNotFound     = "未找到用户配置文件"
	ErrInvalidParams       = "无效的请求参数"
	ErrEmptyUserID         = "用户ID为空"
	ErrUnauthorized        = "无权操作此配置文件"
	ErrGetProfileService   = "获取配置文件服务失败"

	// 成功信息
	SuccessProfileCreated = "创建成功"
	MsgRegisterSuccess    = "注册成功"

	// 错误消息
	ErrGetProfile         = "获取配置文件失败"
	ErrGetTextureService  = "获取材质服务失败"
	ErrInvalidContentType = "无效的请求内容类型"
	ErrParseMultipartForm = "解析多部分表单失败"
	ErrGetFileFromForm    = "从表单获取文件失败"
	ErrInvalidFileType    = "无效的文件类型，仅支持PNG图片"
	ErrSaveTexture        = "保存材质失败"
	ErrSetTexture         = "设置材质失败"
	ErrGetTexture         = "获取材质失败"

	// 内存限制
	MaxMultipartMemory = 32 << 20 // 32 MB

	// 材质类型
	TextureTypeSkin = "SKIN"
	TextureTypeCape = "CAPE"

	// 内容类型
	ContentTypePNG       = "image/png"
	ContentTypeMultipart = "multipart/form-data"

	// 表单参数
	FormKeyModel = "model"
	FormKeyFile  = "file"

	// 元数据键
	MetaKeyModel = "model"
)

// 正则表达式
var (
	// 邮箱正则表达式
	emailRegex = regexp.MustCompile(`^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$`)

	// 密码强度正则表达式（最少8位，只允许字母、数字和特定特殊字符）
	passwordRegex = regexp.MustCompile(`^[a-zA-Z0-9!@#$%^&*]{8,}$`)
)

// 请求结构体
type (
	// AuthenticateRequest 认证请求
	AuthenticateRequest struct {
		Agent       map[string]interface{} `json:"agent"`
		ClientToken string                 `json:"clientToken"`
		Identifier  string                 `json:"username" binding:"required"`
		Password    string                 `json:"password" binding:"required"`
		RequestUser bool                   `json:"requestUser"`
	}

	// ValidTokenRequest 验证令牌请求
	ValidTokenRequest struct {
		AccessToken string `json:"accessToken" binding:"required"`
		ClientToken string `json:"clientToken"`
	}

	// RefreshRequest 刷新令牌请求
	RefreshRequest struct {
		AccessToken     string                 `json:"accessToken" binding:"required"`
		ClientToken     string                 `json:"clientToken"`
		RequestUser     bool                   `json:"requestUser"`
		SelectedProfile map[string]interface{} `json:"selectedProfile"`
	}

	// SignOutRequest 登出请求
	SignOutRequest struct {
		Email    string `json:"username" binding:"required"`
		Password string `json:"password" binding:"required"`
	}

	JoinServerRequest struct {
		ServerID        string `json:"serverId" binding:"required"`
		AccessToken     string `json:"accessToken" binding:"required"`
		SelectedProfile string `json:"selectedProfile" binding:"required"`
	}
)

// 响应结构体
type (
	// AuthenticateResponse 认证响应
	AuthenticateResponse struct {
		AccessToken       string                   `json:"accessToken"`
		ClientToken       string                   `json:"clientToken"`
		SelectedProfile   map[string]interface{}   `json:"selectedProfile,omitempty"`
		AvailableProfiles []map[string]interface{} `json:"availableProfiles"`
		User              map[string]interface{}   `json:"user,omitempty"`
	}

	// RefreshResponse 刷新令牌响应
	RefreshResponse struct {
		AccessToken     string                 `json:"accessToken"`
		ClientToken     string                 `json:"clientToken"`
		SelectedProfile map[string]interface{} `json:"selectedProfile,omitempty"`
		User            map[string]interface{} `json:"user,omitempty"`
	}
)

type APIResponse struct {
	Status int         `json:"status"`
	Data   interface{} `json:"data"`
	Error  interface{} `json:"error"`
}

// standardResponse 生成标准响应
func standardResponse(c *gin.Context, status int, data interface{}, err interface{}) {
	c.JSON(status, APIResponse{
		Status: status,
		Data:   data,
		Error:  err,
	})
}

// Authenticate 用户认证
func Authenticate(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()

	// 读取并保存原始请求体，以便多次读取
	rawData, err := io.ReadAll(c.Request.Body)
	if err != nil {
		loggerInstance.Error("[ERROR] 读取请求体失败: ", zap.Error(err))
		c.JSON(http.StatusBadRequest, gin.H{"error": "读取请求体失败"})
		return
	}
	c.Request.Body = io.NopCloser(bytes.NewBuffer(rawData))

	// 绑定JSON数据到请求结构体
	var request AuthenticateRequest
	if err = c.ShouldBindJSON(&request); err != nil {
		loggerInstance.Error("[ERROR] 解析认证请求失败: ", zap.Error(err))
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 根据标识符类型（邮箱或用户名）获取用户
	var userId int64
	var profile *model.Profile
	var UUID string
	if emailRegex.MatchString(request.Identifier) {
		userId, err = service.GetUserIDByEmail(db, request.Identifier)
	} else {
		profile, err = service.GetProfileByProfileName(db, request.Identifier)
		if err != nil {
			loggerInstance.Error("[ERROR] 用户名不存在: ", zap.String("标识符", request.Identifier), zap.Error(err))
			c.JSON(http.StatusForbidden, gin.H{"error": err.Error()})
			return
		}
		userId = profile.UserID
		UUID = profile.UUID
	}

	if err != nil {
		loggerInstance.Warn("[WARN] 认证失败: 用户不存在",
			zap.String("标识符:", request.Identifier),
			zap.Error(err))

		return
	}

	// 验证密码
	err = service.VerifyPassword(db, request.Password, userId)
	if err != nil {
		loggerInstance.Warn("[WARN] 认证失败:", zap.Error(err))
		c.JSON(http.StatusForbidden, gin.H{"error": ErrWrongPassword})
		return
	}
	// 生成新令牌
	selectedProfile, availableProfiles, accessToken, clientToken, err := service.NewToken(db, loggerInstance, userId, UUID, request.ClientToken)
	if err != nil {
		loggerInstance.Error("[ERROR] 生成令牌失败:", zap.Error(err), zap.Any("用户ID:", userId))
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	user, err := service.GetUserByID(userId)
	if err != nil {
		loggerInstance.Error("[ERROR] id查找错误:", zap.Error(err), zap.Any("ID:", userId))
	}
	// 处理可用的配置文件
	redisClient := redis.MustGetClient()
	availableProfilesData := make([]map[string]interface{}, 0, len(availableProfiles))
	for _, profile := range availableProfiles {
		availableProfilesData = append(availableProfilesData, service.SerializeProfile(db, loggerInstance, redisClient, *profile))
	}
	response := AuthenticateResponse{
		AccessToken:       accessToken,
		ClientToken:       clientToken,
		AvailableProfiles: availableProfilesData,
	}
	if selectedProfile != nil {
		response.SelectedProfile = service.SerializeProfile(db, loggerInstance, redisClient, *selectedProfile)
	}
	if request.RequestUser {
		// 使用 SerializeUser 来正确处理 Properties 字段
		response.User = service.SerializeUser(loggerInstance, user, UUID)
	}

	// 返回认证响应
	loggerInstance.Info("[INFO] 用户认证成功", zap.Any("用户ID:", userId))
	c.JSON(http.StatusOK, response)
}

// ValidToken 验证令牌
func ValidToken(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()

	var request ValidTokenRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		loggerInstance.Error("[ERROR] 解析验证令牌请求失败: ", zap.Error(err))
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	// 验证令牌
	if service.ValidToken(db, request.AccessToken, request.ClientToken) {
		loggerInstance.Info("[INFO] 令牌验证成功", zap.Any("访问令牌:", request.AccessToken))
		c.JSON(http.StatusNoContent, gin.H{"valid": true})
	} else {
		loggerInstance.Warn("[WARN] 令牌验证失败", zap.Any("访问令牌:", request.AccessToken))
		c.JSON(http.StatusForbidden, gin.H{"valid": false})
	}
}

// RefreshToken 刷新令牌
func RefreshToken(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()

	var request RefreshRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		loggerInstance.Error("[ERROR] 解析刷新令牌请求失败: ", zap.Error(err))
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 获取用户ID和用户信息
	UUID, err := service.GetUUIDByAccessToken(db, request.AccessToken)
	if err != nil {
		loggerInstance.Warn("[WARN] 刷新令牌失败: 无效的访问令牌", zap.Any("令牌:", request.AccessToken), zap.Error(err))
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	userID, _ := service.GetUserIDByAccessToken(db, request.AccessToken)
	// 格式化UUID 这里是因为HMCL的传入参数是HEX格式，为了兼容HMCL，在此做处理
	UUID = utils.FormatUUID(UUID)

	profile, err := service.GetProfileByUUID(db, UUID)
	if err != nil {
		loggerInstance.Error("[ERROR] 刷新令牌失败: 无法获取用户信息 错误: ", zap.Error(err))
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 准备响应数据
	var profileData map[string]interface{}
	var userData map[string]interface{}
	var profileID string

	// 处理选定的配置文件
	if request.SelectedProfile != nil {
		// 验证profileID是否存在
		profileIDValue, ok := request.SelectedProfile["id"]
		if !ok {
			loggerInstance.Error("[ERROR] 刷新令牌失败: 缺少配置文件ID", zap.Any("ID:", userID))
			c.JSON(http.StatusBadRequest, gin.H{"error": "缺少配置文件ID"})
			return
		}

		// 类型断言
		profileID, ok = profileIDValue.(string)
		if !ok {
			loggerInstance.Error("[ERROR] 刷新令牌失败: 配置文件ID类型错误 ", zap.Any("用户ID:", userID))
			c.JSON(http.StatusBadRequest, gin.H{"error": "配置文件ID必须是字符串"})
			return
		}

		// 格式化profileID
		profileID = utils.FormatUUID(profileID)

		// 验证配置文件所属用户
		if profile.UserID != userID {
			loggerInstance.Warn("[WARN] 刷新令牌失败: 用户不匹配   ", zap.Any("用户ID:", userID), zap.Any("配置文件用户ID:", profile.UserID))
			c.JSON(http.StatusBadRequest, gin.H{"error": ErrUserNotMatch})
			return
		}

		profileData = service.SerializeProfile(db, loggerInstance, redis.MustGetClient(), *profile)
	}
	user, _ := service.GetUserByID(userID)
	// 添加用户信息（如果请求了）
	if request.RequestUser {
		userData = service.SerializeUser(loggerInstance, user, UUID)
	}

	// 刷新令牌
	newAccessToken, newClientToken, err := service.RefreshToken(db, loggerInstance,
		request.AccessToken,
		request.ClientToken,
		profileID,
	)
	if err != nil {
		loggerInstance := logger.MustGetLogger()
		loggerInstance.Error("[ERROR] 刷新令牌失败: ", zap.Error(err), zap.Any("用户ID: ", userID))
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 返回响应
	loggerInstance.Info("[INFO] 刷新令牌成功", zap.Any("用户ID:", userID))
	c.JSON(http.StatusOK, RefreshResponse{
		AccessToken:     newAccessToken,
		ClientToken:     newClientToken,
		SelectedProfile: profileData,
		User:            userData,
	})
}

// InvalidToken 使令牌失效
func InvalidToken(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()

	var request ValidTokenRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		loggerInstance.Error("[ERROR] 解析使令牌失效请求失败: ", zap.Error(err))
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	// 使令牌失效
	service.InvalidToken(db, loggerInstance, request.AccessToken)
	loggerInstance.Info("[INFO] 令牌已使失效", zap.Any("访问令牌:", request.AccessToken))
	c.JSON(http.StatusNoContent, gin.H{})
}

// SignOut 用户登出
func SignOut(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()

	var request SignOutRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		loggerInstance.Error("[ERROR] 解析登出请求失败: %v", zap.Error(err))
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 验证邮箱格式
	if !emailRegex.MatchString(request.Email) {
		loggerInstance.Warn("[WARN] 登出失败: 邮箱格式不正确 ", zap.Any(" ", request.Email))
		c.JSON(http.StatusBadRequest, gin.H{"error": ErrInvalidEmailFormat})
		return
	}

	// 通过邮箱获取用户
	user, err := service.GetUserByEmail(request.Email)
	if err != nil {
		loggerInstance.Warn(
			"登出失败: 用户不存在",
			zap.String("邮箱", request.Email),
			zap.Error(err),
		)
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	// 验证密码
	if err := service.VerifyPassword(db, request.Password, user.ID); err != nil {
		loggerInstance.Warn("[WARN] 登出失败: 密码错误", zap.Any("用户ID:", user.ID))
		c.JSON(http.StatusBadRequest, gin.H{"error": ErrWrongPassword})
		return
	}

	// 使该用户的所有令牌失效
	service.InvalidUserTokens(db, loggerInstance, user.ID)
	loggerInstance.Info("[INFO] 用户登出成功", zap.Any("用户ID:", user.ID))
	c.JSON(http.StatusNoContent, gin.H{"valid": true})
}

func GetProfileByUUID(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()
	redisClient := redis.MustGetClient()

	// 获取并格式化UUID
	uuid := utils.FormatUUID(c.Param("uuid"))
	loggerInstance.Info("[INFO] 接收到获取配置文件请求", zap.Any("UUID:", uuid))

	// 获取配置文件
	profile, err := service.GetProfileByUUID(db, uuid)
	if err != nil {
		loggerInstance.Error("[ERROR] 获取配置文件失败:", zap.Error(err), zap.String("UUID:", uuid))
		standardResponse(c, http.StatusInternalServerError, nil, err.Error())
		return
	}

	// 返回配置文件信息
	loggerInstance.Info("[INFO] 成功获取配置文件", zap.String("UUID:", uuid), zap.String("名称:", profile.Name))
	c.JSON(http.StatusOK, service.SerializeProfile(db, loggerInstance, redisClient, *profile))
}

func JoinServer(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()
	redisClient := redis.MustGetClient()

	var request JoinServerRequest
	clientIP := c.ClientIP()

	// 解析请求参数
	if err := c.ShouldBindJSON(&request); err != nil {
		loggerInstance.Error(
			"解析加入服务器请求失败",
			zap.Error(err),
			zap.String("IP", clientIP),
		)
		standardResponse(c, http.StatusBadRequest, nil, ErrInvalidRequest)
		return
	}

	loggerInstance.Info(
		"收到加入服务器请求",
		zap.String("服务器ID", request.ServerID),
		zap.String("用户UUID", request.SelectedProfile),
		zap.String("IP", clientIP),
	)

	// 处理加入服务器请求
	if err := service.JoinServer(db, loggerInstance, redisClient, request.ServerID, request.AccessToken, request.SelectedProfile, clientIP); err != nil {
		loggerInstance.Error(
			"加入服务器失败",
			zap.Error(err),
			zap.String("服务器ID", request.ServerID),
			zap.String("用户UUID", request.SelectedProfile),
			zap.String("IP", clientIP),
		)
		standardResponse(c, http.StatusInternalServerError, nil, ErrJoinServerFailed)
		return
	}

	// 加入成功，返回204状态码
	loggerInstance.Info(
		"加入服务器成功",
		zap.String("服务器ID", request.ServerID),
		zap.String("用户UUID", request.SelectedProfile),
		zap.String("IP", clientIP),
	)
	c.Status(http.StatusNoContent)
}

func HasJoinedServer(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()
	redisClient := redis.MustGetClient()

	clientIP, _ := c.GetQuery("ip")

	// 获取并验证服务器ID参数
	serverID, exists := c.GetQuery("serverId")
	if !exists || serverID == "" {
		loggerInstance.Warn("[WARN] 缺少服务器ID参数", zap.Any("IP:", clientIP))
		standardResponse(c, http.StatusNoContent, nil, ErrServerIDRequired)
		return
	}

	// 获取并验证用户名参数
	username, exists := c.GetQuery("username")
	if !exists || username == "" {
		loggerInstance.Warn("[WARN] 缺少用户名参数", zap.Any("服务器ID:", serverID), zap.Any("IP:", clientIP))
		standardResponse(c, http.StatusNoContent, nil, ErrUsernameRequired)
		return
	}

	loggerInstance.Info("[INFO] 收到会话验证请求", zap.Any("服务器ID:", serverID), zap.Any("用户名: ", username), zap.Any("IP: ", clientIP))

	// 验证玩家是否已加入服务器
	if err := service.HasJoinedServer(loggerInstance, redisClient, serverID, username, clientIP); err != nil {
		loggerInstance.Warn("[WARN] 会话验证失败",
			zap.Error(err),
			zap.String("serverID", serverID),
			zap.String("username", username),
			zap.String("clientIP", clientIP),
		)
		standardResponse(c, http.StatusNoContent, nil, ErrSessionVerifyFailed)
		return
	}

	profile, err := service.GetProfileByUUID(db, username)
	if err != nil {
		loggerInstance.Error("[ERROR] 获取用户配置文件失败: %v - 用户名: %s",
			zap.Error(err),                   // 错误详情（zap 原生支持，保留错误链）
			zap.String("username", username), // 结构化存储用户名（便于检索）
		)
		standardResponse(c, http.StatusNoContent, nil, ErrProfileNotFound)
		return
	}

	// 返回玩家配置文件
	loggerInstance.Info("[INFO] 会话验证成功 - 服务器ID: %s, 用户名: %s, UUID: %s",
		zap.String("serverID", serverID), // 结构化存储服务器ID
		zap.String("username", username), // 结构化存储用户名
		zap.String("UUID", profile.UUID), // 结构化存储UUID
	)
	c.JSON(200, service.SerializeProfile(db, loggerInstance, redisClient, *profile))
}

func GetProfilesByName(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()

	var names []string

	// 解析请求参数
	if err := c.ShouldBindJSON(&names); err != nil {
		loggerInstance.Error("[ERROR] 解析名称数组请求失败: ",
			zap.Error(err),
		)
		standardResponse(c, http.StatusBadRequest, nil, ErrInvalidParams)
		return
	}
	loggerInstance.Info("[INFO] 接收到批量获取配置文件请求",
		zap.Int("名称数量:", len(names)), // 结构化存储名称数量
	)

	// 批量获取配置文件
	profiles, err := service.GetProfilesDataByNames(db, names)
	if err != nil {
		loggerInstance.Error("[ERROR] 获取配置文件失败: ",
			zap.Error(err),
		)
	}

	// 改造：zap 兼容原有 INFO 日志格式
	loggerInstance.Info("[INFO] 成功获取配置文件",
		zap.Int("请求名称数:", len(names)),
		zap.Int("返回结果数: ", len(profiles)),
	)

	c.JSON(http.StatusOK, profiles)
}

func GetMetaData(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	redisClient := redis.MustGetClient()

	meta := gin.H{
		"implementationName":    "CellAuth",
		"implementationVersion": "0.0.1",
		"serverName":            "LittleLan's Yggdrasil Server Implementation.",
		"links": gin.H{
			"homepage": "https://skin.littlelan.cn",
			"register": "https://skin.littlelan.cn/auth",
		},
		"feature.non_email_login":    true,
		"feature.enable_profile_key": true,
	}
	skinDomains := []string{".hitwh.games", ".littlelan.cn"}
	signature, err := service.GetPublicKeyFromRedisFunc(loggerInstance, redisClient)
	if err != nil {
		loggerInstance.Error("[ERROR] 获取公钥失败: ", zap.Error(err))
		standardResponse(c, http.StatusInternalServerError, nil, ErrInternalServer)
		return
	}

	loggerInstance.Info("[INFO] 提供元数据")
	c.JSON(http.StatusOK, gin.H{"meta": meta,
		"skinDomains":        skinDomains,
		"signaturePublickey": signature})
}

func GetPlayerCertificates(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	db := database.MustGetDB()
	redisClient := redis.MustGetClient()

	var uuid string
	authHeader := c.GetHeader("Authorization")
	if authHeader == "" {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Authorization header not provided"})
		c.Abort()
		return
	}

	// 检查是否以 Bearer 开头并提取 sessionID
	bearerPrefix := "Bearer "
	if len(authHeader) < len(bearerPrefix) || authHeader[:len(bearerPrefix)] != bearerPrefix {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid Authorization format"})
		c.Abort()
		return
	}
	tokenID := authHeader[len(bearerPrefix):]
	if tokenID == "" {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid Authorization format"})
		c.Abort()
		return
	}
	var err error
	uuid, err = service.GetUUIDByAccessToken(db, tokenID)

	if uuid == "" {
		loggerInstance.Error("[ERROR] 获取玩家UUID失败: ", zap.Error(err))
		standardResponse(c, http.StatusInternalServerError, nil, ErrInternalServer)
		return
	}

	// 格式化UUID
	uuid = utils.FormatUUID(uuid)

	// 生成玩家证书
	certificate, err := service.GeneratePlayerCertificate(db, loggerInstance, redisClient, uuid)
	if err != nil {
		loggerInstance.Error("[ERROR] 生成玩家证书失败: ", zap.Error(err))
		standardResponse(c, http.StatusInternalServerError, nil, ErrInternalServer)
		return
	}

	loggerInstance.Info("[INFO] 成功生成玩家证书")
	c.JSON(http.StatusOK, certificate)
}