Add admin order management with full status workflow.

internal/repository/order.go

@@ -3,6 +3,7 @@ package repository
 import (
 	"context"
 
+	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
 
 	"shop/internal/models"
@@ -25,7 +26,7 @@ func (r *OrderRepository) Create(ctx context.Context, order *models.Order, items
 
 	err = tx.QueryRow(ctx, `
 		INSERT INTO orders (user_id, guest_name, guest_email, guest_phone, address, total, status)
-		VALUES ($1, $2, $3, $4, $5, $6, 'new')
+		VALUES ($1, $2, $3, $4, $5, $6, 'pending')
 		RETURNING id, created_at
 	`, order.UserID, order.GuestName, order.GuestEmail, order.GuestPhone, order.Address, order.Total,
 	).Scan(&order.ID, &order.CreatedAt)
@@ -91,3 +92,62 @@ func (r *OrderRepository) items(ctx context.Context, orderID int) ([]models.Orde
 	}
 	return items, rows.Err()
 }
+
+func (r *OrderRepository) All(ctx context.Context, limit int) ([]models.Order, error) {
+	rows, err := r.pool.Query(ctx, `
+		SELECT id, user_id, guest_name, guest_email, guest_phone, address, total, status, created_at
+		FROM orders ORDER BY created_at DESC LIMIT $1
+	`, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	return r.collectOrders(ctx, rows)
+}
+
+func (r *OrderRepository) GetByID(ctx context.Context, id int) (models.Order, error) {
+	var o models.Order
+	err := r.pool.QueryRow(ctx, `
+		SELECT id, user_id, guest_name, guest_email, guest_phone, address, total, status, created_at
+		FROM orders WHERE id = $1
+	`, id).Scan(&o.ID, &o.UserID, &o.GuestName, &o.GuestEmail, &o.GuestPhone, &o.Address, &o.Total, &o.Status, &o.CreatedAt)
+	if err != nil {
+		return models.Order{}, err
+	}
+	o.Items, err = r.items(ctx, o.ID)
+	return o, err
+}
+
+func (r *OrderRepository) UpdateStatus(ctx context.Context, id int, status string) error {
+	tag, err := r.pool.Exec(ctx, `UPDATE orders SET status = $1 WHERE id = $2`, status, id)
+	if err != nil {
+		return err
+	}
+	if tag.RowsAffected() == 0 {
+		return pgx.ErrNoRows
+	}
+	return nil
+}
+
+func (r *OrderRepository) Count(ctx context.Context) (int, error) {
+	var n int
+	err := r.pool.QueryRow(ctx, `SELECT COUNT(*) FROM orders`).Scan(&n)
+	return n, err
+}
+
+func (r *OrderRepository) collectOrders(ctx context.Context, rows pgx.Rows) ([]models.Order, error) {
+	var orders []models.Order
+	for rows.Next() {
+		var o models.Order
+		if err := rows.Scan(&o.ID, &o.UserID, &o.GuestName, &o.GuestEmail, &o.GuestPhone, &o.Address, &o.Total, &o.Status, &o.CreatedAt); err != nil {
+			return nil, err
+		}
+		var err error
+		o.Items, err = r.items(ctx, o.ID)
+		if err != nil {
+			return nil, err
+		}
+		orders = append(orders, o)
+	}
+	return orders, rows.Err()
+}