feat: create accounts to partition money

internal/repository/money_account.go

@@ -0,0 +1,137 @@
+package repository
+
+import (
+	"database/sql"
+	"errors"
+	"time"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"github.com/jmoiron/sqlx"
+)
+
+var (
+	ErrMoneyAccountNotFound = errors.New("money account not found")
+	ErrTransferNotFound     = errors.New("account transfer not found")
+)
+
+type MoneyAccountRepository interface {
+	Create(account *model.MoneyAccount) error
+	GetByID(id string) (*model.MoneyAccount, error)
+	GetBySpaceID(spaceID string) ([]*model.MoneyAccount, error)
+	Update(account *model.MoneyAccount) error
+	Delete(id string) error
+
+	CreateTransfer(transfer *model.AccountTransfer) error
+	GetTransfersByAccountID(accountID string) ([]*model.AccountTransfer, error)
+	DeleteTransfer(id string) error
+
+	GetAccountBalance(accountID string) (int, error)
+	GetTotalAllocatedForSpace(spaceID string) (int, error)
+}
+
+type moneyAccountRepository struct {
+	db *sqlx.DB
+}
+
+func NewMoneyAccountRepository(db *sqlx.DB) MoneyAccountRepository {
+	return &moneyAccountRepository{db: db}
+}
+
+func (r *moneyAccountRepository) Create(account *model.MoneyAccount) error {
+	query := `INSERT INTO money_accounts (id, space_id, name, created_by, created_at, updated_at) VALUES ($1, $2, $3, $4, $5, $6);`
+	_, err := r.db.Exec(query, account.ID, account.SpaceID, account.Name, account.CreatedBy, account.CreatedAt, account.UpdatedAt)
+	return err
+}
+
+func (r *moneyAccountRepository) GetByID(id string) (*model.MoneyAccount, error) {
+	account := &model.MoneyAccount{}
+	query := `SELECT * FROM money_accounts WHERE id = $1;`
+	err := r.db.Get(account, query, id)
+	if err == sql.ErrNoRows {
+		return nil, ErrMoneyAccountNotFound
+	}
+	return account, err
+}
+
+func (r *moneyAccountRepository) GetBySpaceID(spaceID string) ([]*model.MoneyAccount, error) {
+	var accounts []*model.MoneyAccount
+	query := `SELECT * FROM money_accounts WHERE space_id = $1 ORDER BY created_at DESC;`
+	err := r.db.Select(&accounts, query, spaceID)
+	if err != nil {
+		return nil, err
+	}
+	return accounts, nil
+}
+
+func (r *moneyAccountRepository) Update(account *model.MoneyAccount) error {
+	account.UpdatedAt = time.Now()
+	query := `UPDATE money_accounts SET name = $1, updated_at = $2 WHERE id = $3;`
+	result, err := r.db.Exec(query, account.Name, account.UpdatedAt, account.ID)
+	if err != nil {
+		return err
+	}
+	rows, err := result.RowsAffected()
+	if err == nil && rows == 0 {
+		return ErrMoneyAccountNotFound
+	}
+	return err
+}
+
+func (r *moneyAccountRepository) Delete(id string) error {
+	query := `DELETE FROM money_accounts WHERE id = $1;`
+	result, err := r.db.Exec(query, id)
+	if err != nil {
+		return err
+	}
+	rows, err := result.RowsAffected()
+	if err == nil && rows == 0 {
+		return ErrMoneyAccountNotFound
+	}
+	return err
+}
+
+func (r *moneyAccountRepository) CreateTransfer(transfer *model.AccountTransfer) error {
+	query := `INSERT INTO account_transfers (id, account_id, amount_cents, direction, note, created_by, created_at) VALUES ($1, $2, $3, $4, $5, $6, $7);`
+	_, err := r.db.Exec(query, transfer.ID, transfer.AccountID, transfer.AmountCents, transfer.Direction, transfer.Note, transfer.CreatedBy, transfer.CreatedAt)
+	return err
+}
+
+func (r *moneyAccountRepository) GetTransfersByAccountID(accountID string) ([]*model.AccountTransfer, error) {
+	var transfers []*model.AccountTransfer
+	query := `SELECT * FROM account_transfers WHERE account_id = $1 ORDER BY created_at DESC;`
+	err := r.db.Select(&transfers, query, accountID)
+	if err != nil {
+		return nil, err
+	}
+	return transfers, nil
+}
+
+func (r *moneyAccountRepository) DeleteTransfer(id string) error {
+	query := `DELETE FROM account_transfers WHERE id = $1;`
+	result, err := r.db.Exec(query, id)
+	if err != nil {
+		return err
+	}
+	rows, err := result.RowsAffected()
+	if err == nil && rows == 0 {
+		return ErrTransferNotFound
+	}
+	return err
+}
+
+func (r *moneyAccountRepository) GetAccountBalance(accountID string) (int, error) {
+	var balance int
+	query := `SELECT COALESCE(SUM(CASE WHEN direction = 'deposit' THEN amount_cents ELSE -amount_cents END), 0) FROM account_transfers WHERE account_id = $1;`
+	err := r.db.Get(&balance, query, accountID)
+	return balance, err
+}
+
+func (r *moneyAccountRepository) GetTotalAllocatedForSpace(spaceID string) (int, error) {
+	var total int
+	query := `SELECT COALESCE(SUM(CASE WHEN t.direction = 'deposit' THEN t.amount_cents ELSE -t.amount_cents END), 0)
+		FROM account_transfers t
+		JOIN money_accounts a ON t.account_id = a.id
+		WHERE a.space_id = $1;`
+	err := r.db.Get(&total, query, spaceID)
+	return total, err
+}