package beancount

import (
	"time"

	"github.com/mayswind/ezbookkeeping/pkg/converters/converter"
	"github.com/mayswind/ezbookkeeping/pkg/core"
	"github.com/mayswind/ezbookkeeping/pkg/models"
	"github.com/mayswind/ezbookkeeping/pkg/utils"
)

var beancountTransactionTypeNameMapping = map[models.TransactionType]string{
	models.TRANSACTION_TYPE_MODIFY_BALANCE: utils.IntToString(int(models.TRANSACTION_TYPE_MODIFY_BALANCE)),
	models.TRANSACTION_TYPE_INCOME:         utils.IntToString(int(models.TRANSACTION_TYPE_INCOME)),
	models.TRANSACTION_TYPE_EXPENSE:        utils.IntToString(int(models.TRANSACTION_TYPE_EXPENSE)),
	models.TRANSACTION_TYPE_TRANSFER:       utils.IntToString(int(models.TRANSACTION_TYPE_TRANSFER)),
}

// beancountTransactionDataImporter defines the structure of Beancount importer for transaction data
type beancountTransactionDataImporter struct {
}

// Initialize a beancount transaction data importer singleton instance
var (
	BeancountTransactionDataImporter = &beancountTransactionDataImporter{}
)

// ParseImportedData returns the imported data by parsing the Beancount transaction data
func (c *beancountTransactionDataImporter) ParseImportedData(ctx core.Context, user *models.User, data []byte, defaultTimezone *time.Location, additionalOptions converter.TransactionDataImporterOptions, accountMap map[string]*models.Account, expenseCategoryMap map[string]map[string]*models.TransactionCategory, incomeCategoryMap map[string]map[string]*models.TransactionCategory, transferCategoryMap map[string]map[string]*models.TransactionCategory, tagMap map[string]*models.TransactionTag) (models.ImportedTransactionSlice, []*models.Account, []*models.TransactionCategory, []*models.TransactionCategory, []*models.TransactionCategory, []*models.TransactionTag, error) {
	beancountDataReader, err := createNewBeancountDataReader(ctx, data)

	if err != nil {
		return nil, nil, nil, nil, nil, nil, err
	}

	beancountData, err := beancountDataReader.read(ctx)

	if err != nil {
		return nil, nil, nil, nil, nil, nil, err
	}

	transactionDataTable, err := createNewBeancountTransactionDataTable(beancountData)

	if err != nil {
		return nil, nil, nil, nil, nil, nil, err
	}

	dataTableImporter := converter.CreateNewImporterWithTypeNameMapping(beancountTransactionTypeNameMapping, "", "", BEANCOUNT_TRANSACTION_TAG_SEPARATOR)

	return dataTableImporter.ParseImportedData(ctx, user, transactionDataTable, defaultTimezone, additionalOptions, accountMap, expenseCategoryMap, incomeCategoryMap, transferCategoryMap, tagMap)
}