package wallet

import (
	"context"
	"fmt"
	"log"

	"go.uber.org/zap"
	"penahub.gitlab.yandexcloud.net/pena-services/customer/internal/errors"
	"penahub.gitlab.yandexcloud.net/pena-services/customer/internal/models"
	"penahub.gitlab.yandexcloud.net/pena-services/customer/pkg/validate"
)

type accountRepository interface {
	ChangeWallet(ctx context.Context, userID string, wallet *models.Wallet) (*models.Account, errors.Error)
	FindByUserID(ctx context.Context, id string) (*models.Account, errors.Error)
}

type currencyClient interface {
	Translate(context.Context, *models.TranslateCurrency) (float64, errors.Error)
}

type Deps struct {
	Logger         *zap.Logger
	Repository     accountRepository
	CurrencyClient currencyClient
}

type Service struct {
	logger         *zap.Logger
	repository     accountRepository
	currencyClient currencyClient
}

func New(deps *Deps) *Service {
	if deps == nil {
		log.Panicln("deps is nil on <New (wallet service)>")
	}

	if deps.Logger == nil {
		log.Panicln("logger is nil on <New (v service)>")
	}

	if deps.Repository == nil {
		log.Panicln("repository is nil on <New (wallet service)>")
	}

	if deps.CurrencyClient == nil {
		log.Panicln("CurrencyClient is nil on <New (wallet service)>")
	}

	return &Service{
		logger:         deps.Logger,
		repository:     deps.Repository,
		currencyClient: deps.CurrencyClient,
	}
}

func (receiver *Service) ReplenishAccountWallet(ctx context.Context, request *models.ReplenishAccountWallet) (*models.Account, errors.Error) {
	account, err := receiver.repository.FindByUserID(ctx, request.UserID)
	if err != nil {
		receiver.logger.Error("failed to find account on <ReplenishAccountWallet> of <WalletService>",
			zap.Error(err.Extract()),
			zap.String("userID", request.UserID),
		)

		return nil, err
	}

	if validate.IsStringEmpty(account.Wallet.Currency) {
		return nil, errors.New(
			fmt.Errorf("currency of account <%s> is empty <ReplenishAccountWallet> of <WalletService>", account.UserID),
			errors.ErrInternalError,
		)
	}

	cash, err := receiver.currencyClient.Translate(ctx, &models.TranslateCurrency{
		Money: request.Cash,
		From:  request.Currency,
		To:    account.Wallet.Currency,
	})
	if err != nil {
		receiver.logger.Error("failed to translate cash on <ReplenishAccountWallet> of <WalletService>",
			zap.Error(err.Extract()),
		)

		return nil, err
	}

	if request.Currency == models.InternalCurrencyKey {
		updatedAccount, changeErr := receiver.repository.ChangeWallet(ctx, account.UserID, &models.Wallet{
			Cash:     account.Wallet.Cash + cash,
			Money:    account.Wallet.Money + request.Cash,
			Currency: account.Wallet.Currency,
		})
		if changeErr != nil {
			receiver.logger.Error("failed to replenish wallet on <ReplenishAccountWallet> of <WalletService>",
				zap.Error(changeErr.Extract()),
				zap.String("Currency", account.Wallet.Currency),
				zap.Float64("Money", account.Wallet.Money+request.Cash),
				zap.Float64("Cash", account.Wallet.Cash+cash),
				zap.Bool("Is currensy equal internal", request.Currency == models.InternalCurrencyKey),
			)

			return nil, changeErr
		}

		return updatedAccount, nil
	}

	money, err := receiver.currencyClient.Translate(ctx, &models.TranslateCurrency{
		Money: request.Cash,
		From:  request.Currency,
		To:    models.InternalCurrencyKey,
	})
	if err != nil {
		receiver.logger.Error("failed to translate money on <ReplenishAccountWallet> of <WalletService>",
			zap.Error(err.Extract()),
		)

		return nil, err
	}

	updatedAccount, err := receiver.repository.ChangeWallet(ctx, account.UserID, &models.Wallet{
		Cash:     account.Wallet.Cash + cash,
		Money:    account.Wallet.Money + money,
		Currency: account.Wallet.Currency,
	})
	if err != nil {
		receiver.logger.Error("failed to replenish wallet on <ReplenishAccountWallet> of <WalletService>",
			zap.Error(err.Extract()),
			zap.String("Currency", account.Wallet.Currency),
			zap.Float64("Money", account.Wallet.Money+request.Cash),
			zap.Float64("Cash", account.Wallet.Cash+cash),
			zap.Bool("Is currensy equal internal", request.Currency == models.InternalCurrencyKey),
		)

		return nil, err
	}

	return updatedAccount, nil
}

func (receiver *Service) ChangeCurrency(ctx context.Context, userID string, currency models.CurrencyKey) (*models.Account, errors.Error) {
	account, err := receiver.repository.FindByUserID(ctx, userID)
	if err != nil {
		receiver.logger.Error("failed to find account on <ChangeCurrency> of <WalletService>",
			zap.Error(err.Extract()),
			zap.String("userID", userID),
			zap.Any("currency", currency),
		)

		return nil, err
	}

	cash, err := receiver.currencyClient.Translate(ctx, &models.TranslateCurrency{
		Money: account.Wallet.Cash,
		From:  account.Wallet.Currency,
		To:    currency,
	})
	if err != nil {
		receiver.logger.Error("failed to translate currency on <ChangeCurrency> of <WalletService>",
			zap.Error(err.Extract()),
		)

		return nil, err
	}

	updatedAccount, err := receiver.repository.ChangeWallet(ctx, account.UserID, &models.Wallet{
		Cash:     cash,
		Currency: currency,
		Money:    account.Wallet.Money,
	})
	if err != nil {
		receiver.logger.Error("failed to update wallet on <ChangeCurrency> of <WalletService>",
			zap.Error(err.Extract()),
		)

		return nil, err
	}

	return updatedAccount, nil
}