package admin

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

	"bindbox-game/internal/code"
	"bindbox-game/internal/pkg/core"
	"bindbox-game/internal/pkg/validation"
	"bindbox-game/internal/service/snapshot"
)

type getOrderSnapshotsResponse struct {
	Order struct {
		ID           int64  `json:"id"`
		OrderNo      string `json:"order_no"`
		UserID       int64  `json:"user_id"`
		Status       int32  `json:"status"`
		ActualAmount int64  `json:"actual_amount"`
		PaidAt       string `json:"paid_at"`
	} `json:"order"`
	BeforeSnapshot *snapshot.UserStateSnapshot `json:"before_snapshot"`
	AfterSnapshot  *snapshot.UserStateSnapshot `json:"after_snapshot"`
	Diff           *snapshot.SnapshotDiff      `json:"diff"`
	HasSnapshots   bool                        `json:"has_snapshots"`
}

// GetOrderSnapshots 获取订单快照
// @Summary 获取订单审计快照
// @Description 获取订单消费前后的完整用户状态快照
// @Tags Admin-Audit
// @Accept json
// @Produce json
// @Param order_id path int true "订单ID"
// @Success 200 {object} getOrderSnapshotsResponse "成功"
// @Router /api/admin/orders/{order_id}/snapshots [get]
func (h *handler) GetOrderSnapshots() core.HandlerFunc {
	return func(ctx core.Context) {
		orderIDStr := ctx.Param("order_id")
		orderID, err := strconv.ParseInt(orderIDStr, 10, 64)
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, "无效的订单ID"))
			return
		}

		// 查询订单
		order, err := h.readDB.Orders.WithContext(ctx.RequestContext()).Where(h.readDB.Orders.ID.Eq(orderID)).First()
		if err != nil || order == nil {
			ctx.AbortWithError(core.Error(http.StatusNotFound, 21003, "订单不存在"))
			return
		}

		rsp := &getOrderSnapshotsResponse{}
		rsp.Order.ID = order.ID
		rsp.Order.OrderNo = order.OrderNo
		rsp.Order.UserID = order.UserID
		rsp.Order.Status = order.Status
		rsp.Order.ActualAmount = order.ActualAmount
		if !order.PaidAt.IsZero() {
			rsp.Order.PaidAt = order.PaidAt.Format("2006-01-02 15:04:05")
		}

		// 使用快照服务获取快照
		beforeSnap, afterSnap, err := h.snapshotSvc.GetSnapshotsByOrderID(ctx.RequestContext(), orderID)
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusInternalServerError, 21010, err.Error()))
			return
		}

		if beforeSnap == nil && afterSnap == nil {
			rsp.HasSnapshots = false
			ctx.Payload(rsp)
			return
		}

		rsp.HasSnapshots = true

		// 解析快照数据
		if beforeSnap != nil {
			var before snapshot.UserStateSnapshot
			if err := json.Unmarshal([]byte(beforeSnap.SnapshotData), &before); err == nil {
				rsp.BeforeSnapshot = &before
			}
		}

		if afterSnap != nil {
			var after snapshot.UserStateSnapshot
			if err := json.Unmarshal([]byte(afterSnap.SnapshotData), &after); err == nil {
				rsp.AfterSnapshot = &after
			}
		}

		// 计算差异
		if rsp.BeforeSnapshot != nil && rsp.AfterSnapshot != nil {
			rsp.Diff = h.snapshotSvc.CompareSnapshots(rsp.BeforeSnapshot, rsp.AfterSnapshot)
		}

		ctx.Payload(rsp)
	}
}

type rollbackOrderRequest struct {
	Reason  string `json:"reason" form:"reason"`
	Confirm bool   `json:"confirm" form:"confirm"`
}

type rollbackOrderResponse struct {
	Success           bool   `json:"success"`
	RollbackLogID     int64  `json:"rollback_log_id"`
	PointsRestored    int64  `json:"points_restored"`
	CouponsRestored   int    `json:"coupons_restored"`
	ItemCardsRestored int    `json:"item_cards_restored"`
	InventoryRevoked  int    `json:"inventory_revoked"`
	RefundAmount      int64  `json:"refund_amount"`
	ErrorMsg          string `json:"error_msg,omitempty"`
}

// RollbackOrder 回滚订单
// @Summary 回滚订单到消费前状态
// @Description 基于快照将用户数据回滚到消费前状态，包括恢复积分、优惠券、道具卡，作废资产，调用微信退款
// @Tags Admin-Audit
// @Accept json
// @Produce json
// @Param order_id path int true "订单ID"
// @Param request body rollbackOrderRequest true "回滚请求"
// @Success 200 {object} rollbackOrderResponse "成功"
// @Router /api/admin/orders/{order_id}/rollback [post]
func (h *handler) RollbackOrder() core.HandlerFunc {
	return func(ctx core.Context) {
		orderIDStr := ctx.Param("order_id")
		orderID, err := strconv.ParseInt(orderIDStr, 10, 64)
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, code.ParamBindError, "无效的订单ID"))
			return
		}

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

		if !req.Confirm {
			ctx.AbortWithError(core.Error(http.StatusBadRequest, 21011, "请确认回滚操作"))
			return
		}

		// 获取操作人信息
		operatorID := int64(ctx.SessionUserInfo().Id)
		operatorName := ctx.SessionUserInfo().NickName

		// 执行回滚
		result, err := h.rollbackSvc.ExecuteRollback(ctx.RequestContext(), orderID, operatorID, operatorName, req.Reason)
		if err != nil {
			ctx.AbortWithError(core.Error(http.StatusInternalServerError, 21012, err.Error()))
			return
		}

		rsp := &rollbackOrderResponse{
			Success:           result.Success,
			RollbackLogID:     result.RollbackLogID,
			PointsRestored:    result.PointsRestored,
			CouponsRestored:   result.CouponsRestored,
			ItemCardsRestored: result.ItemCardsRestored,
			InventoryRevoked:  result.InventoryRevoked,
			RefundAmount:      result.RefundAmount,
			ErrorMsg:          result.ErrorMsg,
		}

		ctx.Payload(rsp)
	}
}