package exchangerates

import (
	"github.com/mayswind/ezbookkeeping/pkg/core"
	"github.com/mayswind/ezbookkeeping/pkg/errs"
	"github.com/mayswind/ezbookkeeping/pkg/models"
	"github.com/mayswind/ezbookkeeping/pkg/settings"
)

// ExchangeRatesDataProviderContainer contains the current exchange rates data provider
type ExchangeRatesDataProviderContainer struct {
	current ExchangeRatesDataProvider
}

// Initialize a exchange rates data provider container singleton instance
var (
	Container = &ExchangeRatesDataProviderContainer{}
)

// InitializeExchangeRatesDataSource initializes the current exchange rates data source according to the config
func InitializeExchangeRatesDataSource(config *settings.Config) error {
	if config.ExchangeRatesDataSource == settings.BankOfCanadaDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &BankOfCanadaDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.CzechNationalBankDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &CzechNationalBankDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.DanmarksNationalbankDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &DanmarksNationalbankDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.EuroCentralBankDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &EuroCentralBankDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.NationalBankOfGeorgiaDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &NationalBankOfGeorgiaDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.CentralBankOfHungaryDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &CentralBankOfHungaryDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.BankOfIsraelDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &BankOfIsraelDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.CentralBankOfMyanmarDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &CentralBankOfMyanmarDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.NorgesBankDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &NorgesBankDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.NationalBankOfPolandDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &NationalBankOfPolandDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.NationalBankOfRomaniaDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &NationalBankOfRomaniaDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.BankOfRussiaDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &BankOfRussiaDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.SwissNationalBankDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &SwissNationalBankDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.NationalBankOfUkraineDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &NationalBankOfUkraineDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.CentralBankOfUzbekistanDataSource {
		Container.current = newCommonHttpExchangeRatesDataProvider(config, &CentralBankOfUzbekistanDataSource{})
		return nil
	} else if config.ExchangeRatesDataSource == settings.UserCustomExchangeRatesDataSource {
		Container.current = newUserCustomExchangeRatesDataProvider()
		return nil
	}

	return errs.ErrInvalidExchangeRatesDataSource
}

// GetLatestExchangeRates returns the latest exchange rates data from the current exchange rates data source
func (e *ExchangeRatesDataProviderContainer) GetLatestExchangeRates(c core.Context, uid int64, currentConfig *settings.Config) (*models.LatestExchangeRateResponse, error) {
	if Container.current == nil {
		return nil, errs.ErrInvalidExchangeRatesDataSource
	}

	return e.current.GetLatestExchangeRates(c, uid, currentConfig)
}