feat: recurring expenses and reports

internal/repository/budget.go

@@ -0,0 +1,77 @@
+package repository
+
+import (
+	"database/sql"
+	"errors"
+	"time"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"github.com/jmoiron/sqlx"
+)
+
+var (
+	ErrBudgetNotFound = errors.New("budget not found")
+)
+
+type BudgetRepository interface {
+	Create(budget *model.Budget) error
+	GetByID(id string) (*model.Budget, error)
+	GetBySpaceID(spaceID string) ([]*model.Budget, error)
+	GetSpentForBudget(spaceID, tagID string, periodStart, periodEnd time.Time) (int, error)
+	Update(budget *model.Budget) error
+	Delete(id string) error
+}
+
+type budgetRepository struct {
+	db *sqlx.DB
+}
+
+func NewBudgetRepository(db *sqlx.DB) BudgetRepository {
+	return &budgetRepository{db: db}
+}
+
+func (r *budgetRepository) Create(budget *model.Budget) error {
+	query := `INSERT INTO budgets (id, space_id, tag_id, amount_cents, period, start_date, end_date, is_active, created_by, created_at, updated_at)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11);`
+	_, err := r.db.Exec(query, budget.ID, budget.SpaceID, budget.TagID, budget.AmountCents, budget.Period, budget.StartDate, budget.EndDate, budget.IsActive, budget.CreatedBy, budget.CreatedAt, budget.UpdatedAt)
+	return err
+}
+
+func (r *budgetRepository) GetByID(id string) (*model.Budget, error) {
+	budget := &model.Budget{}
+	err := r.db.Get(budget, `SELECT * FROM budgets WHERE id = $1;`, id)
+	if err == sql.ErrNoRows {
+		return nil, ErrBudgetNotFound
+	}
+	return budget, err
+}
+
+func (r *budgetRepository) GetBySpaceID(spaceID string) ([]*model.Budget, error) {
+	var budgets []*model.Budget
+	err := r.db.Select(&budgets, `SELECT * FROM budgets WHERE space_id = $1 ORDER BY created_at DESC;`, spaceID)
+	return budgets, err
+}
+
+func (r *budgetRepository) GetSpentForBudget(spaceID, tagID string, periodStart, periodEnd time.Time) (int, error) {
+	var spent int
+	query := `
+		SELECT COALESCE(SUM(e.amount_cents), 0)
+		FROM expenses e
+		JOIN expense_tags et ON e.id = et.expense_id
+		WHERE e.space_id = $1 AND et.tag_id = $2 AND e.type = 'expense'
+		  AND e.date >= $3 AND e.date <= $4;
+	`
+	err := r.db.Get(&spent, query, spaceID, tagID, periodStart, periodEnd)
+	return spent, err
+}
+
+func (r *budgetRepository) Update(budget *model.Budget) error {
+	query := `UPDATE budgets SET tag_id = $1, amount_cents = $2, period = $3, start_date = $4, end_date = $5, is_active = $6, updated_at = $7 WHERE id = $8;`
+	_, err := r.db.Exec(query, budget.TagID, budget.AmountCents, budget.Period, budget.StartDate, budget.EndDate, budget.IsActive, budget.UpdatedAt, budget.ID)
+	return err
+}
+
+func (r *budgetRepository) Delete(id string) error {
+	_, err := r.db.Exec(`DELETE FROM budgets WHERE id = $1;`, id)
+	return err
+}