package game

import (
	"bindbox-game/internal/code"
	"bindbox-game/internal/pkg/core"
	"bindbox-game/internal/pkg/logger"
	"bindbox-game/internal/pkg/validation"
	"bindbox-game/internal/repository/mysql"
	"bindbox-game/internal/repository/mysql/dao"
	"bindbox-game/internal/service/game"
	usersvc "bindbox-game/internal/service/user"
	"encoding/json"
	"net/http"
	"strconv"

	"github.com/redis/go-redis/v9"
	"go.uber.org/zap"
)

type handler struct {
	logger    logger.CustomLogger
	db        mysql.Repo
	redis     *redis.Client
	ticketSvc game.TicketService
	userSvc   usersvc.Service
	readDB    *dao.Query
}

func New(l logger.CustomLogger, db mysql.Repo, rdb *redis.Client, userSvc usersvc.Service) *handler {
	return &handler{
		logger:    l,
		db:        db,
		redis:     rdb,
		ticketSvc: game.NewTicketService(l, db),
		userSvc:   userSvc,
		readDB:    dao.Use(db.GetDbR()),
	}
}

// ========== Admin API ==========

type grantTicketRequest struct {
	GameCode string `json:"game_code" binding:"required"`
	Amount   int    `json:"amount" binding:"required,min=1"`
	Remark   string `json:"remark"`
}

// GrantUserTicket Admin为用户发放游戏资格
// @Summary 发放游戏资格
// @Tags 管理端.游戏
// @Param user_id path int true "用户ID"
// @Param RequestBody body grantTicketRequest true "请求参数"
// @Success 200 {object} map[string]any
// @Router /api/admin/users/{user_id}/game_tickets [post]
func (h *handler) GrantUserTicket() core.HandlerFunc {
	return func(ctx core.Context) {
		userID, err := strconv.ParseInt(ctx.Param("user_id"), 10, 64)
		if err != nil || userID <= 0 {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, "invalid user_id"))
			return
		}

		req := new(grantTicketRequest)
		if err := ctx.ShouldBindJSON(req); err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, validation.Error(err)))
			return
		}

		err = h.ticketSvc.GrantTicket(ctx.RequestContext(), userID, req.GameCode, req.Amount, "admin", 0, req.Remark)
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusInternalServerError, code.ServerError, err.Error()))
			return
		}

		ctx.Payload(map[string]any{"success": true})
	}
}

// ListUserTickets Admin查询用户游戏资格日志
// @Summary 查询用户游戏资格日志
// @Tags 管理端.游戏
// @Param user_id path int true "用户ID"
// @Param page query int false "页码"
// @Param page_size query int false "每页数量"
// @Success 200 {object} map[string]any
// @Router /api/admin/users/{user_id}/game_tickets [get]
func (h *handler) ListUserTickets() core.HandlerFunc {
	return func(ctx core.Context) {
		userID, err := strconv.ParseInt(ctx.Param("user_id"), 10, 64)
		if err != nil || userID <= 0 {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, "invalid user_id"))
			return
		}

		var req struct {
			Page     int `form:"page"`
			PageSize int `form:"page_size"`
		}
		_ = ctx.ShouldBindQuery(&req)

		if req.Page <= 0 {
			req.Page = 1
		}
		if req.PageSize <= 0 {
			req.PageSize = 20
		}

		logs, total, err := h.ticketSvc.GetTicketLogs(ctx.RequestContext(), userID, req.Page, req.PageSize)
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusInternalServerError, code.ServerError, err.Error()))
			return
		}

		ctx.Payload(map[string]any{
			"list":      logs,
			"total":     total,
			"page":      req.Page,
			"page_size": req.PageSize,
		})
	}
}

// ========== App API ==========

// GetMyTickets App获取我的游戏资格
// @Summary 获取我的游戏资格
// @Tags APP端.游戏
// @Param user_id path int true "用户ID"
// @Success 200 {object} map[string]int
// @Router /api/app/users/{user_id}/game_tickets [get]
func (h *handler) GetMyTickets() core.HandlerFunc {
	return func(ctx core.Context) {
		userID := int64(ctx.SessionUserInfo().Id)

		tickets, err := h.ticketSvc.GetUserTickets(ctx.RequestContext(), userID)
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusInternalServerError, code.ServerError, err.Error()))
			return
		}

		ctx.Payload(tickets)
	}
}

type enterGameRequest struct {
	GameCode string `json:"game_code" binding:"required"`
}

type enterGameResponse struct {
	TicketToken    string `json:"ticket_token"`
	NakamaServer   string `json:"nakama_server"`
	NakamaKey      string `json:"nakama_key"`
	RemainingTimes int    `json:"remaining_times"`
}

// EnterGame App进入游戏(消耗资格)
// @Summary 进入游戏
// @Tags APP端.游戏
// @Param RequestBody body enterGameRequest true "请求参数"
// @Success 200 {object} enterGameResponse
// @Router /api/app/games/enter [post]
func (h *handler) EnterGame() core.HandlerFunc {
	return func(ctx core.Context) {
		userID := int64(ctx.SessionUserInfo().Id)

		req := new(enterGameRequest)
		if err := ctx.ShouldBindJSON(req); err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, validation.Error(err)))
			return
		}

		// 扣减资格
		if err := h.ticketSvc.UseTicket(ctx.RequestContext(), userID, req.GameCode); err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, 180001, "游戏次数不足"))
			return
		}

		// 生成临时token并存入Redis
		ticketToken := generateTicketToken(userID)
		h.redis.Set(ctx.RequestContext(), "game:ticket:"+ticketToken, userID, 30*60*1000000000) // 30分钟

		// 查询剩余次数
		ticket, _ := h.ticketSvc.GetUserTicketByGame(ctx.RequestContext(), userID, req.GameCode)
		remaining := 0
		if ticket != nil {
			remaining = int(ticket.Available)
		}

		// TODO: 从配置读取Nakama服务器信息
		ctx.Payload(&enterGameResponse{
			TicketToken:    ticketToken,
			NakamaServer:   "ws://localhost:7350",
			NakamaKey:      "defaultkey",
			RemainingTimes: remaining,
		})
	}
}

// ========== Internal API (Nakama调用) ==========

type verifyRequest struct {
	UserID string `json:"user_id"`
	Ticket string `json:"ticket"`
}

type verifyResponse struct {
	Valid      bool           `json:"valid"`
	UserID     string         `json:"user_id"`
	GameConfig map[string]any `json:"game_config,omitempty"`
}

// VerifyTicket Internal验证游戏票据
// @Summary 验证票据
// @Tags Internal.游戏
// @Param RequestBody body verifyRequest true "请求参数"
// @Success 200 {object} verifyResponse
// @Router /internal/game/verify [post]
func (h *handler) VerifyTicket() core.HandlerFunc {
	return func(ctx core.Context) {
		req := new(verifyRequest)
		if err := ctx.ShouldBindJSON(req); err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, validation.Error(err)))
			return
		}

		// 从Redis验证token
		storedUserID, err := h.redis.Get(ctx.RequestContext(), "game:ticket:"+req.Ticket).Result()
		if err != nil || storedUserID != req.UserID {
			ctx.Payload(&verifyResponse{Valid: false})
			return
		}

		// 获取游戏配置
		gameConfig := make(map[string]any)
		configKey := "game_minesweeper_config"
		conf, err := h.readDB.SystemConfigs.WithContext(ctx.RequestContext()).Where(h.readDB.SystemConfigs.ConfigKey.Eq(configKey)).First()
		if err == nil && conf != nil {
			json.Unmarshal([]byte(conf.ConfigValue), &gameConfig)
		}

		ctx.Payload(&verifyResponse{Valid: true, UserID: req.UserID, GameConfig: gameConfig})
	}
}

type settleRequest struct {
	UserID  string `json:"user_id"`
	Ticket  string `json:"ticket"`
	MatchID string `json:"match_id"`
	Win     bool   `json:"win"`
	Score   int    `json:"score"`
}

type settleResponse struct {
	Success bool   `json:"success"`
	Reward  string `json:"reward,omitempty"`
}

// SettleGame Internal游戏结算
// @Summary 游戏结算
// @Tags Internal.游戏
// @Param RequestBody body settleRequest true "请求参数"
// @Success 200 {object} settleResponse
// @Router /internal/game/settle [post]
func (h *handler) SettleGame() core.HandlerFunc {
	return func(ctx core.Context) {
		req := new(settleRequest)
		if err := ctx.ShouldBindJSON(req); err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, validation.Error(err)))
			return
		}

		// 验证token
		storedUserID, err := h.redis.Get(ctx.RequestContext(), "game:ticket:"+req.Ticket).Result()
		if err != nil || storedUserID != req.UserID {
			ctx.Payload(&settleResponse{Success: false})
			return
		}

		// 删除token防止重复使用
		h.redis.Del(ctx.RequestContext(), "game:ticket:"+req.Ticket)

		// 奖品发放逻辑
		var rewardMsg string
		var msConfig struct {
			WinnerRewardPoints           int64 `json:"winner_reward_points"`
			ParticipationRewardPoints    int64 `json:"participation_reward_points"`
			WinnerRewardProductID        int64 `json:"winner_reward_product_id"`
			ParticipationRewardProductID int64 `json:"participation_reward_product_id"`
		}

		// 1. 读取配置
		configKey := "game_minesweeper_config"
		conf, err := h.readDB.SystemConfigs.WithContext(ctx.RequestContext()).Where(h.readDB.SystemConfigs.ConfigKey.Eq(configKey)).First()
		if err == nil && conf != nil {
			json.Unmarshal([]byte(conf.ConfigValue), &msConfig)
		}

		uid, _ := strconv.ParseInt(req.UserID, 10, 64)

		// 2. 确定奖励内容
		var targetProductID int64
		var targetPoints int64

		if req.Win {
			targetProductID = msConfig.WinnerRewardProductID
			targetPoints = msConfig.WinnerRewardPoints
			if targetPoints == 0 && targetProductID == 0 {
				targetPoints = 100 // 兜底
			}
		} else {
			targetProductID = msConfig.ParticipationRewardProductID
			targetPoints = msConfig.ParticipationRewardPoints
			if targetPoints == 0 && targetProductID == 0 {
				targetPoints = 10 // 兜底
			}
		}

		// 3. 发放奖励
		if targetProductID > 0 {
			res, err := h.userSvc.GrantReward(ctx.RequestContext(), uid, usersvc.GrantRewardRequest{
				ProductID: targetProductID,
				Quantity:  1,
				Remark:    "扫雷游戏奖励",
			})
			if err != nil || !res.Success {
				h.logger.Error("Failed to grant game product reward", zap.Error(err), zap.String("msg", res.Message))
				rewardMsg = "奖励发放失败"
			} else {
				rewardMsg = "获得奖品"
			}
		} else if targetPoints > 0 {
			err := h.userSvc.AddPointsWithAction(ctx.RequestContext(), uid, targetPoints, "game_reward", "扫雷游戏奖励", "minesweeper_settle", nil, nil)
			if err != nil {
				h.logger.Error("Failed to grant game points", zap.Error(err))
			}
			rewardMsg = strconv.FormatInt(targetPoints, 10) + "积分"
		}

		ctx.Payload(&settleResponse{Success: true, Reward: rewardMsg})
	}
}

// GetMinesweeperConfig Internal获取扫雷配置
// @Summary 获取扫雷配置
// @Tags Internal.游戏
// @Success 200 {object} map[string]interface{}
// @Router /internal/game/minesweeper/config [get]
func (h *handler) GetMinesweeperConfig() core.HandlerFunc {
	return func(ctx core.Context) {
		configKey := "game_minesweeper_config"
		conf, err := h.readDB.SystemConfigs.WithContext(ctx.RequestContext()).Where(h.readDB.SystemConfigs.ConfigKey.Eq(configKey)).First()
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ServerError, "获取配置失败"))
			return
		}

		var gameConfig map[string]interface{}
		if err := json.Unmarshal([]byte(conf.ConfigValue), &gameConfig); err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ServerError, "解析配置失败"))
			return
		}

		ctx.Payload(gameConfig)
	}
}

// ========== Helpers ==========

func generateTicketToken(userID int64) string {
	return "GT" + randomString(16)
}

func randomString(n int) string {
	const letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
	b := make([]byte, n)
	for i := range b {
		b[i] = letters[i%len(letters)]
	}
	return string(b)
}