package handler

import (
	"errors"
	"net/http"

	apperrors "carrotskin/internal/errors"
	"carrotskin/internal/container"
	"carrotskin/internal/service"

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

// YggdrasilFriendsHandler MinecraftServices 好友系接口处理器（文档 1.1~1.3、1.6）
type YggdrasilFriendsHandler struct {
	container *container.Container
	logger    *zap.Logger
}

// NewYggdrasilFriendsHandler 创建 YggdrasilFriendsHandler 实例
func NewYggdrasilFriendsHandler(c *container.Container) *YggdrasilFriendsHandler {
	return &YggdrasilFriendsHandler{
		container: c,
		logger:    c.Logger,
	}
}

// extractProfileUUID 解析 Bearer token 得到当前请求者的 Profile UUID
// 失败时已写入 401 响应
func (h *YggdrasilFriendsHandler) extractProfileUUID(c *gin.Context) (string, bool) {
	token, ok := extractBearerToken(c)
	if !ok {
		return "", false
	}
	uuid, err := h.container.TokenService.GetUUIDByAccessToken(c.Request.Context(), token)
	if err != nil || uuid == "" {
		h.logger.Warn("好友接口鉴权失败: 无效令牌", zap.Error(err))
		c.JSON(http.StatusUnauthorized, apperrors.NewMinecraftServicesErrorResponse(
			c.Request.URL.Path, "UNAUTHORIZED", "Invalid token", nil,
		))
		return "", false
	}
	return uuid, true
}

// respondFriendsError 将 service 错误映射为 MinecraftServices 标准错误响应
func (h *YggdrasilFriendsHandler) respondFriendsError(c *gin.Context, err error) {
	var appErr *apperrors.AppError
	if errors.As(err, &appErr) {
		// 未知 profile / 不能加自己 -> 400
		if appErr.Code == 400 {
			c.JSON(http.StatusBadRequest, apperrors.NewMinecraftServicesErrorResponse(
				c.Request.URL.Path, appErr.Message, appErr.Message, nil,
			))
			return
		}
		if appErr.Code == 403 {
			c.JSON(http.StatusForbidden, apperrors.NewMinecraftServicesErrorResponse(
				c.Request.URL.Path, "FORBIDDEN", appErr.Message, nil,
			))
			return
		}
	}
	h.logger.Error("好友接口内部错误", zap.Error(err))
	c.JSON(http.StatusInternalServerError, apperrors.NewMinecraftServicesErrorResponse(
		c.Request.URL.Path, "SERVICE_NOT_AVAILABLE", "Internal server error", nil,
	))
}

// GetFriends 获取好友列表
// @Summary MinecraftServices 好友列表
// @Description 拉取好友列表与收到/发出的好友请求（文档 1.3.1）
// @Tags Yggdrasil
// @Produce json
// @Param Authorization header string true "Bearer {accessToken}"
// @Success 200 {object} service.FriendsListResponse
// @Failure 401 {object} apperrors.MinecraftServicesErrorResponse "未授权"
// @Failure 500 {object} apperrors.MinecraftServicesErrorResponse "服务器错误"
// @Router /api/yggdrasil/minecraftservices/friends [get]
func (h *YggdrasilFriendsHandler) GetFriends(c *gin.Context) {
	uuid, ok := h.extractProfileUUID(c)
	if !ok {
		return
	}
	resp, err := h.container.FriendsService.ListFriends(c.Request.Context(), uuid)
	if err != nil {
		h.respondFriendsError(c, err)
		return
	}
	c.JSON(http.StatusOK, resp)
}

// UpdateFriends 添加/删除好友、接受/拒绝/撤回请求
// @Summary MinecraftServices 好友操作
// @Description 通过 updateType=ADD/REMOVE 进行好友加删、接受/拒绝/撤回请求（文档 1.3.2）
// @Tags Yggdrasil
// @Accept json
// @Produce json
// @Param Authorization header string true "Bearer {accessToken}"
// @Param request body service.FriendActionRequest true "好友操作请求"
// @Success 200 {object} service.FriendsListResponse
// @Failure 400 {object} apperrors.MinecraftServicesErrorResponse "参数错误"
// @Failure 401 {object} apperrors.MinecraftServicesErrorResponse "未授权"
// @Router /api/yggdrasil/minecraftservices/friends [put]
func (h *YggdrasilFriendsHandler) UpdateFriends(c *gin.Context) {
	uuid, ok := h.extractProfileUUID(c)
	if !ok {
		return
	}
	var req service.FriendActionRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, apperrors.NewMinecraftServicesErrorResponse(
			c.Request.URL.Path, "UNKNOWN_PROFILE", "Invalid request body", nil,
		))
		return
	}
	resp, err := h.container.FriendsService.PerformFriendAction(c.Request.Context(), uuid, req)
	if err != nil {
		h.respondFriendsError(c, err)
		return
	}
	c.JSON(http.StatusOK, resp)
}

// GetAttributes 获取玩家属性
// @Summary MinecraftServices 玩家属性
// @Description 拉取好友/脏词过滤/聊天偏好属性（文档 1.2.1）
// @Tags Yggdrasil
// @Produce json
// @Param Authorization header string true "Bearer {accessToken}"
// @Success 200 {object} service.PlayerAttributesResponse
// @Failure 401 {object} apperrors.MinecraftServicesErrorResponse "未授权"
// @Router /api/yggdrasil/minecraftservices/player/attributes [get]
func (h *YggdrasilFriendsHandler) GetAttributes(c *gin.Context) {
	uuid, ok := h.extractProfileUUID(c)
	if !ok {
		return
	}
	resp, err := h.container.FriendsService.GetAttributes(c.Request.Context(), uuid)
	if err != nil {
		h.respondFriendsError(c, err)
		return
	}
	c.JSON(http.StatusOK, resp)
}

// UpdateAttributes 更新玩家偏好属性
// @Summary MinecraftServices 更新玩家属性
// @Description 更新好友/脏词过滤偏好（文档 1.2.2）
// @Tags Yggdrasil
// @Accept json
// @Produce json
// @Param Authorization header string true "Bearer {accessToken}"
// @Param request body service.PlayerAttributesRequest true "偏好更新请求"
// @Success 200 {object} service.PlayerAttributesResponse
// @Failure 400 {object} apperrors.MinecraftServicesErrorResponse "参数错误"
// @Failure 401 {object} apperrors.MinecraftServicesErrorResponse "未授权"
// @Router /api/yggdrasil/minecraftservices/player/attributes [post]
func (h *YggdrasilFriendsHandler) UpdateAttributes(c *gin.Context) {
	uuid, ok := h.extractProfileUUID(c)
	if !ok {
		return
	}
	var req service.PlayerAttributesRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, apperrors.NewMinecraftServicesErrorResponse(
			c.Request.URL.Path, "UNKNOWN_PROFILE", "Invalid request body", nil,
		))
		return
	}
	if err := h.container.FriendsService.UpdateAttributes(c.Request.Context(), uuid, req); err != nil {
		h.respondFriendsError(c, err)
		return
	}
	// 返回最新属性
	resp, err := h.container.FriendsService.GetAttributes(c.Request.Context(), uuid)
	if err != nil {
		h.respondFriendsError(c, err)
		return
	}
	c.JSON(http.StatusOK, resp)
}

// UpdatePresence 上报在线状态
// @Summary MinecraftServices 在线状态
// @Description 上报当前在线状态并返回好友在线状态列表（文档 1.1）
// @Tags Yggdrasil
// @Accept json
// @Produce json
// @Param Authorization header string true "Bearer {accessToken}"
// @Param request body service.PresenceRequest true "状态上报请求"
// @Success 200 {object} service.PresenceResponse
// @Failure 400 {object} apperrors.MinecraftServicesErrorResponse "参数错误"
// @Failure 401 {object} apperrors.MinecraftServicesErrorResponse "未授权"
// @Router /api/yggdrasil/minecraftservices/presence [post]
func (h *YggdrasilFriendsHandler) UpdatePresence(c *gin.Context) {
	uuid, ok := h.extractProfileUUID(c)
	if !ok {
		return
	}
	var req service.PresenceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, apperrors.NewMinecraftServicesErrorResponse(
			c.Request.URL.Path, "INVALID_STATUS", "Invalid request body", nil,
		))
		return
	}
	if req.Status == "" {
		c.JSON(http.StatusBadRequest, apperrors.NewMinecraftServicesErrorResponse(
			c.Request.URL.Path, "INVALID_STATUS", "Bad status value", nil,
		))
		return
	}
	resp, err := h.container.FriendsService.UpdatePresence(c.Request.Context(), uuid, req.Status)
	if err != nil {
		h.respondFriendsError(c, err)
		return
	}
	c.JSON(http.StatusOK, resp)
}

// GetBlocklist 获取玩家屏蔽列表
// @Summary MinecraftServices 屏蔽列表
// @Description 拉取被屏蔽玩家档案 UUID 列表（文档 1.6）
// @Tags Yggdrasil
// @Produce json
// @Param Authorization header string true "Bearer {accessToken}"
// @Success 200 {object} service.BlockListResponse
// @Failure 401 {object} apperrors.MinecraftServicesErrorResponse "未授权"
// @Router /api/yggdrasil/minecraftservices/privacy/blocklist [get]
func (h *YggdrasilFriendsHandler) GetBlocklist(c *gin.Context) {
	uuid, ok := h.extractProfileUUID(c)
	if !ok {
		return
	}
	resp, err := h.container.FriendsService.GetBlocklist(c.Request.Context(), uuid)
	if err != nil {
		h.respondFriendsError(c, err)
		return
	}
	c.JSON(http.StatusOK, resp)
}