package logic

import (
	"context"
	"errors"
	"time"

	"juwan-backend/app/wallet/rpc/internal/models/wallet"
	"juwan-backend/app/wallet/rpc/internal/svc"
	"juwan-backend/app/wallet/rpc/pb"

	"github.com/shopspring/decimal"

	"github.com/zeromicro/go-zero/core/logx"
)

type UpdateWalletsLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
}

func NewUpdateWalletsLogic(ctx context.Context, svcCtx *svc.ServiceContext) *UpdateWalletsLogic {
	return &UpdateWalletsLogic{
		ctx:    ctx,
		svcCtx: svcCtx,
		Logger: logx.WithContext(ctx),
	}
}

func (l *UpdateWalletsLogic) UpdateWallets(in *pb.UpdateWalletsReq) (*pb.UpdateWalletsResp, error) {
	if in.Version == nil {
		return nil, errors.New("version is required")
	}

	tx, err := l.svcCtx.WalletModelsRW.Tx(l.ctx)
	if err != nil {
		return nil, err
	}

	updater := tx.Wallet.Update().
		Where(wallet.UserIDEQ(in.UserId), wallet.VersionEQ(int(in.GetVersion()))).
		AddVersion(1)

	if in.Balance != nil {
		parsedBalance, perr := decimal.NewFromString(in.GetBalance())
		if perr != nil {
			_ = tx.Rollback()
			return nil, errors.New("invalid balance")
		}
		updater = updater.SetBalance(parsedBalance)
	}
	if in.FrozenBalance != nil {
		parsedFrozenBalance, perr := decimal.NewFromString(in.GetFrozenBalance())
		if perr != nil {
			_ = tx.Rollback()
			return nil, errors.New("invalid frozenBalance")
		}
		updater = updater.SetFrozenBalance(parsedFrozenBalance)
	}
	if in.UpdatedAt != nil && in.GetUpdatedAt() > 0 {
		updater = updater.SetUpdatedAt(time.Unix(in.GetUpdatedAt(), 0))
	} else {
		updater = updater.SetUpdatedAt(time.Now())
	}

	affected, err := updater.Save(l.ctx)
	if err != nil {
		_ = tx.Rollback()
		return nil, err
	}
	if affected == 0 {
		exist, qerr := tx.Wallet.Query().Where(wallet.UserIDEQ(in.UserId)).Exist(l.ctx)
		_ = tx.Rollback()
		if qerr != nil {
			return nil, qerr
		}
		if !exist {
			return nil, errors.New("wallet not found")
		}
		return nil, errors.New("wallet update conflict")
	}

	if err = tx.Commit(); err != nil {
		return nil, err
	}

	return &pb.UpdateWalletsResp{}, nil
}