ynab-portfolio-monitor/ynab/accounts.go

package ynab

import (
	"fmt"
	"log"
	"net/url"
)

// Reference: https://api.ynab.com/v1#/Accounts/

type Accounts struct {
	Data struct {
		Account struct {
			ID                  string      `json:"id"`
			Name                string      `json:"name"`
			Type                string      `json:"type"`
			OnBudget            bool        `json:"on_budget"`
			Closed              bool        `json:"closed"`
			Note                interface{} `json:"note"`
			Balance             int         `json:"balance"`
			ClearedBalance      int         `json:"cleared_balance"`
			UnclearedBalance    int         `json:"uncleared_balance"`
			TransferPayeeID     string      `json:"transfer_payee_id"`
			DirectImportLinked  bool        `json:"direct_import_linked"`
			DirectImportInError bool        `json:"direct_import_in_error"`
			Deleted             bool        `json:"deleted"`
		} `json:"account"`
		ServerKnowledge int `json:"server_knowledge"`
	} `json:"data"`
}

func (c *Client) GetAccount(accountID string) (*Accounts, error) {
	response := Accounts{}

	err := c.get(fmt.Sprintf("/accounts/%s", accountID), &response, url.Values{})
	if err != nil {
		return nil, fmt.Errorf("failed to get accounts: %v", err)
	}

	return &response, nil
}

// Creates a "Capital Gains or Losses" adjustment transaction or updates an existing one if it exists to ensure the account balance
// for the accountID provided equals the balance provided
func (c *Client) SetAccountBalance(accountID string, balance int) error {

	ynabTransactionID, ynabTransactionAmount, err := c.getTodayYnabCapitalGainsTransaction(accountID)
	if err != nil {
		return fmt.Errorf("failed to get ynab capital gains transaction ID: %v", err)
	}

	ynabAccount, err := c.GetAccount(accountID)
	if err != nil {
		return fmt.Errorf("failed to get ynab account with id '%s': %v", accountID, err)
	}

	if balance == ynabAccount.Data.Account.ClearedBalance {
		return nil // The YNAB account already has the balance we're requesting, so there is no need to do anything
	}

	balanceDelta := balance - ynabAccount.Data.Account.ClearedBalance
	balanceDelta += ynabTransactionAmount // Take into account the existing transaction
	if balanceDelta == 0 {
		return nil // If balanceDelta is 0 do not create a transaction i.e. market is closed today
	}

	if ynabTransactionID == "" {
		// there is no transaction - so create a new one
		err = c.createTodayYNABCapitalGainsTransaction(accountID, balanceDelta)
		if err != nil {
			return fmt.Errorf("failed to create YNAB capital gains transaction for account ID '%s': %v", accountID, err)
		}
		log.Printf("Creating new capital gains transaction for YNAB account '%s' for amount: %d", accountID, balanceDelta)

	} else {
		// there is an existing transaction - so update the existing one

		err = c.updateTodayYNABCapitalGainsTransaction(accountID, ynabTransactionID, balanceDelta)
		if err != nil {
			return fmt.Errorf("failed to update YNAB capital gains transaction for account ID '%s': %v", accountID, err)
		}
		log.Printf("Updating existing capital gains transaction for YNAB account '%s' for amount: %d", accountID, balanceDelta)
	}
	return nil
}