feat: savings allocations

internal/repository/allocation.go

@@ -0,0 +1,95 @@
+package repository
+
+import (
+	"database/sql"
+	"errors"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"github.com/jmoiron/sqlx"
+	"github.com/shopspring/decimal"
+)
+
+var ErrAllocationNotFound = errors.New("allocation not found")
+
+type AllocationRepository interface {
+	Create(allocation *model.Allocation) error
+	ByID(id string) (*model.Allocation, error)
+	ByAccountID(accountID string) ([]*model.Allocation, error)
+	SumByAccountID(accountID string) (decimal.Decimal, error)
+	Update(id, name string, amount decimal.Decimal, target *decimal.Decimal) error
+	Delete(id string) error
+}
+
+type allocationRepository struct {
+	db *sqlx.DB
+}
+
+func NewAllocationRepository(db *sqlx.DB) AllocationRepository {
+	return &allocationRepository{db: db}
+}
+
+func (r *allocationRepository) Create(a *model.Allocation) error {
+	query := `INSERT INTO allocations (id, account_id, name, amount, target_amount, sort_order, created_at, updated_at)
+	          VALUES ($1, $2, $3, $4, $5, $6, $7, $8);`
+	_, err := r.db.Exec(query, a.ID, a.AccountID, a.Name, a.Amount, a.TargetAmount, a.SortOrder, a.CreatedAt, a.UpdatedAt)
+	return err
+}
+
+func (r *allocationRepository) ByID(id string) (*model.Allocation, error) {
+	a := &model.Allocation{}
+	query := `SELECT * FROM allocations WHERE id = $1;`
+	err := r.db.Get(a, query, id)
+	if err == sql.ErrNoRows {
+		return nil, ErrAllocationNotFound
+	}
+	return a, err
+}
+
+func (r *allocationRepository) ByAccountID(accountID string) ([]*model.Allocation, error) {
+	var out []*model.Allocation
+	query := `SELECT * FROM allocations WHERE account_id = $1 ORDER BY sort_order ASC, created_at ASC;`
+	err := r.db.Select(&out, query, accountID)
+	return out, err
+}
+
+func (r *allocationRepository) SumByAccountID(accountID string) (decimal.Decimal, error) {
+	var sum decimal.Decimal
+	query := `SELECT COALESCE(SUM(amount::numeric), 0)::text FROM allocations WHERE account_id = $1;`
+	if err := r.db.Get(&sum, query, accountID); err != nil {
+		return decimal.Zero, err
+	}
+	return sum, nil
+}
+
+func (r *allocationRepository) Update(id, name string, amount decimal.Decimal, target *decimal.Decimal) error {
+	query := `UPDATE allocations
+	          SET name = $1, amount = $2, target_amount = $3, updated_at = CURRENT_TIMESTAMP
+	          WHERE id = $4;`
+	res, err := r.db.Exec(query, name, amount, target, id)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return ErrAllocationNotFound
+	}
+	return nil
+}
+
+func (r *allocationRepository) Delete(id string) error {
+	res, err := r.db.Exec(`DELETE FROM allocations WHERE id = $1;`, id)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return ErrAllocationNotFound
+	}
+	return nil
+}