package admin

import (
	"encoding/hex"
	"encoding/json"
	"net/http"
	"strconv"

	"bindbox-game/internal/code"
	"bindbox-game/internal/pkg/core"
	"bindbox-game/internal/pkg/validation"
	"bindbox-game/internal/repository/mysql/model"
)

type batchDrawRequest struct {
	UserIDs []int64 `json:"user_ids" binding:"required,min=1,max=1000,dive,min=1"`
}

type batchDrawResponse struct {
	Draws []drawResultItem `json:"draws"`
}

type drawResultItem struct {
	UserID     int64       `json:"user_id"`
	DrawID     int64       `json:"draw_id"`
	RewardID   int64       `json:"reward_id"`
	RewardName string      `json:"reward_name"`
	IsWinner   bool        `json:"is_winner"`
	Receipt    interface{} `json:"receipt"`
}

func (h *handler) BatchDrawForUsers() core.HandlerFunc {
	return func(ctx core.Context) {
		activityIDStr := ctx.Param("activity_id")
		if activityIDStr == "" {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, "未传递活动ID"))
			return
		}
		issueIDStr := ctx.Param("issue_id")
		if issueIDStr == "" {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, "未传递期ID"))
			return
		}
		if _, err := strconv.ParseInt(issueIDStr, 10, 64); err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, validation.Error(err)))
			return
		}
		issueID, _ := strconv.ParseInt(issueIDStr, 10, 64)
		_, _ = strconv.ParseInt(activityIDStr, 10, 64)
		var req batchDrawRequest
		if err := ctx.ShouldBindJSON(&req); err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, validation.Error(err)))
			return
		}
		rewards, err := h.activity.ListIssueRewards(ctx.RequestContext(), issueID)
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ExecuteDrawError, err.Error()))
			return
		}
		rewardMap := make(map[int64]string, len(rewards))
		for _, r := range rewards {
			rewardMap[r.ID] = r.Name
		}

		// 开始事务处理
		tx := h.writeDB.Begin()
		if tx.Error != nil {
			ctx.AbortWithError(core.Error(http.StatusInternalServerError, code.ExecuteDrawError, "启动事务失败"))
			return
		}
		defer func() {
			if r := recover(); r != nil {
				tx.Rollback()
				panic(r)
			}
		}()

		draws := make([]drawResultItem, 0, len(req.UserIDs))
		for _, uid := range req.UserIDs {
			// 执行抽奖（应用头衔效果）
			rec, err := h.activity.ExecuteDrawWithEffects(ctx.RequestContext(), issueID, uid)
			if err != nil {
				tx.Rollback()
				ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ExecuteDrawError, err.Error()))
				return
			}

			// 创建抽奖日志
			isWinner := int32(0)
			if rec.SelectedItemId > 0 {
				isWinner = 1
			}

			drawLog := &model.ActivityDrawLogs{
				UserID:   uid,
				IssueID:  issueID,
				RewardID: rec.SelectedItemId,
				IsWinner: isWinner,
				Level:    1, // 默认等级
			}

			if err := tx.ActivityDrawLogs.Create(drawLog); err != nil {
				tx.Rollback()
				ctx.AbortWithError(core.Error(http.StatusInternalServerError, code.ExecuteDrawError, "创建抽奖日志失败"))
				return
			}

			// 保存抽奖收据
			itemsSnapshot, _ := json.Marshal(rec.Items)
			receipt := &model.ActivityDrawReceipts{
				DrawLogID:      drawLog.ID,
				AlgoVersion:    rec.AlgoVersion,
				RoundID:        rec.RoundId,
				DrawID:         rec.DrawId,
				ClientID:       rec.ClientId,
				Timestamp:      rec.Timestamp,
				ServerSeedHash: hex.EncodeToString(rec.ServerSeedHash),
				ServerSubSeed:  hex.EncodeToString(rec.ServerSubSeed),
				ClientSeed:     hex.EncodeToString(rec.ClientSeed),
				Nonce:          int64(rec.Nonce),
				ItemsRoot:      hex.EncodeToString(rec.ItemsRoot),
				WeightsTotal:   int64(rec.WeightsTotal),
				SelectedIndex:  int32(rec.SelectedIndex),
				RandProof:      hex.EncodeToString(rec.RandProof),
				Signature:      "", // 可以后续添加签名
				ItemsSnapshot:  string(itemsSnapshot),
			}

			if err := tx.ActivityDrawReceipts.Create(receipt); err != nil {
				tx.Rollback()
				ctx.AbortWithError(core.Error(http.StatusInternalServerError, code.ExecuteDrawError, "保存抽奖收据失败"))
				return
			}

			name := ""
			if rec.SelectedItemId > 0 {
				name = rewardMap[rec.SelectedItemId]
			}
			draws = append(draws, drawResultItem{
				UserID:     uid,
				DrawID:     rec.DrawId,
				RewardID:   rec.SelectedItemId,
				RewardName: name,
				IsWinner:   rec.SelectedItemId > 0,
				Receipt:    rec,
			})
		}

		// 提交事务
		if err := tx.Commit(); err != nil {
			tx.Rollback()
			ctx.AbortWithError(core.Error(http.StatusInternalServerError, code.ExecuteDrawError, "提交事务失败"))
			return
		}

		ctx.Payload(&batchDrawResponse{Draws: draws})
	}
}