package coin_manager

import (
	"context"
	"github.com/zeromicro/go-zero/core/logx"
	"gorm.io/gorm"
	pbMq "live-service/app/pb/mq"
	pbVars "live-service/app/pb/vars"
	"live-service/app/user_center/model"
	"live-service/app/user_center/rpc/internal/mq"
	"live-service/app/user_center/rpc/pb"
	"live-service/common/nerr"
)

type (
	Manager struct {
		userCoinModel model.UserCoinModel
		userMq        *mq.UserMq

		logx.Logger
	}
	ChangeCoinReq struct {
		BattleId int64 // 战局ID
		UserId   int64 // 用户ID
		Change   int64 // 变化量(负数为减扣)
	}
	ChangeCoinResp struct {
		BattleId int64 // 战局ID
		UserId   int64 // 用户ID
		Change   int64 // 变化量(负数为减扣)
		Current  int64 // 当前量
	}
)

func NewCoinManager(mod model.UserCoinModel, userMq *mq.UserMq) *Manager {
	return &Manager{
		userCoinModel: mod,
		userMq:        userMq,
		Logger:        logx.WithContext(context.Background()),
	}
}

func (m *Manager) GetUserCoin(ctx context.Context, userId int64) (int64, error) {
	resp, err := m.userCoinModel.FindOne(ctx, nil, userId)
	if err != nil {
		return 0, err
	}
	return resp.Coin, err
}

func (m *Manager) TransferCoin(ctx context.Context, req *pb.TransferUserCoinReq) (*pb.TransferUserCoinResp, error) {
	if req.Transfer < 0 {
		req.Transfer = -req.Transfer
	}
	resp := &pb.TransferUserCoinResp{
		UserId:       req.UserId,
		TargetUserId: req.TargetUserId,
	}
	if err := m.userCoinModel.TransactCtx(ctx, nil, func(tx *gorm.DB) error {
		if req.UserId == 0 {
			return nerr.NewError(nerr.RequestParamError, "源用户ID为空")
		}
		if req.TargetUserId == 0 {
			return nerr.NewError(nerr.RequestParamError, "目标用户ID为空")
		}
		coin, err := m.userCoinModel.ChangeCoin(ctx, tx, req.UserId, -req.Transfer)
		if err != nil {
			return nerr.NewWithErr(err)
		}
		targetCoin, err := m.userCoinModel.ChangeCoin(ctx, tx, req.TargetUserId, req.Transfer)
		if err != nil {
			return nerr.NewWithErr(err)
		}
		resp.UserCoin = coin
		resp.TargetUserCoin = targetCoin

		// 通知
		go func() {
			m.userMq.NotifyUserCoinChanged(&pbMq.MqUserCoinChanged{
				UserId:  req.UserId,
				Change:  -req.Transfer,
				Current: coin,
				Reason:  pbVars.UserCoinChangedReason_Transfer,
			})
			m.userMq.NotifyUserCoinChanged(&pbMq.MqUserCoinChanged{
				UserId:  req.TargetUserId,
				Change:  req.Transfer,
				Current: targetCoin,
				Reason:  pbVars.UserCoinChangedReason_Transfer,
			})
		}()

		return nil
	}); err != nil {
		return nil, err
	}
	return resp, nil
}

func (m *Manager) ChangeCoin(ctx context.Context, tx *gorm.DB, req *ChangeCoinReq, reason pbVars.UserCoinChangedReason) (*ChangeCoinResp, error) {
	coin, err := m.userCoinModel.ChangeCoin(ctx, tx, req.UserId, req.Change)
	if err != nil {
		return nil, err
	}

	// 通知
	go m.userMq.NotifyUserCoinChanged(&pbMq.MqUserCoinChanged{
		UserId:  req.UserId,
		Change:  req.Change,
		Current: coin,
		Reason:  reason,
	})

	return &ChangeCoinResp{
		UserId:  req.UserId,
		Change:  req.Change,
		Current: coin,
	}, nil
}

func (m *Manager) ChangeCoinBatch(ctx context.Context, req []ChangeCoinReq, reason pbVars.UserCoinChangedReason) (map[int64]ChangeCoinResp, error) {
	resp := make(map[int64]ChangeCoinResp)
	if err := m.userCoinModel.TransactCtx(ctx, nil, func(tx *gorm.DB) error {
		for _, item := range req {
			coin, err := m.userCoinModel.ChangeCoin(ctx, tx, item.UserId, item.Change)
			if err != nil {
				return err
			}
			resp[item.UserId] = ChangeCoinResp{
				BattleId: item.BattleId,
				UserId:   item.UserId,
				Change:   item.Change,
				Current:  coin,
			}
		}
		return nil
	}); err != nil {
		return resp, err
	}

	go func() {
		for _, coinResp := range resp {
			m.userMq.NotifyUserCoinChanged(&pbMq.MqUserCoinChanged{
				UserId:  coinResp.UserId,
				Change:  coinResp.Change,
				Current: coinResp.Current,
				Reason:  reason,
			})
		}
	}()

	return resp, nil
}