package repository

import (
	"app-cloudep-trade-service/internal/domain/repository"
	"app-cloudep-trade-service/internal/domain/wallet"
	"app-cloudep-trade-service/internal/model"
	"context"

	"github.com/shopspring/decimal"
	"github.com/zeromicro/go-zero/core/stores/sqlx"
)

// 用戶某個幣種餘額
type userLocalWallet struct {
	wm     model.WalletModel
	txConn sqlx.SqlConn

	uid      string
	currency string

	// local wallet 相關計算的餘額存在這裡
	walletBalance map[wallet.BalanceType]model.Wallet

	// local order wallet 相關計算的餘額存在這裡
	localOrderBalance map[int64]decimal.Decimal

	// local wallet 內所有餘額變化紀錄
	transactions []model.WalletJournal
}

// GetBalancesByID 使用 Wallet ID 取得餘額，如果需要上鎖，可以在 option 內加上 tx 以及 lock，可以參考 TestBalanceUseCase
func (use *userLocalWallet) GetBalancesByID(ctx context.Context, ids []int64, opts ...repository.WalletOperatorOption) ([]model.Wallet, error) {
	o := repository.ApplyOptions(opts...)
	tx := use.txConn
	if o.Tx != nil {
		tx = *o.Tx
	}

	wallets, err := use.wm.BalancesByIDs(ctx, ids, o.WithLock, tx)
	if err != nil {
		return nil, err
	}

	for _, w := range wallets {
		use.walletBalance[w.WalletType] = w
	}

	return wallets, nil
}

// LocalBalance 內存餘額
func (use *userLocalWallet) LocalBalance(BalanceType wallet.BalanceType) decimal.Decimal {
	w, ok := use.walletBalance[BalanceType]
	if !ok {
		return decimal.Zero
	}

	return w.Balance
}

// Balances 取得餘額，如果需要上鎖，可以在option 內加上 tx 以及 lock，可以參考 TestBalanceUseCase
func (use *userLocalWallet) Balances(ctx context.Context, balanceType []wallet.BalanceType, opts ...repository.WalletOperatorOption) ([]model.Wallet, error) {
	o := repository.ApplyOptions(opts...)
	tx := use.txConn
	if o.Tx != nil {
		tx = *o.Tx
	}

	wallets, err := use.wm.Balances(ctx, model.BalanceReq{
		UID:      []string{use.uid},
		Currency: []string{use.currency},
		Kind:     balanceType,
	}, o.WithLock, tx)
	if err != nil {
		return nil, err
	}

	for _, wallet := range wallets {
		use.walletBalance[wallet.WalletType] = wallet
	}

	return wallets, nil
}

func NewUserWalletOperator(uid, currency string, wm model.WalletModel, txConn sqlx.SqlConn) repository.UserWalletOperator {
	return &userLocalWallet{
		wm:       wm,
		txConn:   txConn,
		uid:      uid,
		currency: currency,

		walletBalance:     make(map[wallet.BalanceType]model.Wallet, len(wallet.AllBalanceTypes)),
		localOrderBalance: make(map[int64]decimal.Decimal, len(wallet.AllBalanceTypes)),
	}
}