package db

import (
	"context"

	"github.com/jackc/pgx/v5/pgxpool"

	"github.com/jacek/pamietnik/backend/internal/domain"
)

type UserStore struct {
	pool *pgxpool.Pool
}

func NewUserStore(pool *pgxpool.Pool) *UserStore {
	return &UserStore{pool: pool}
}

// ListUsers returns all users ordered by created_at.
func (s *UserStore) ListUsers(ctx context.Context) ([]domain.User, error) {
	rows, err := s.pool.Query(ctx,
		`SELECT user_id, username, is_admin, created_at FROM users ORDER BY created_at`,
	)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var users []domain.User
	for rows.Next() {
		var u domain.User
		if err := rows.Scan(&u.UserID, &u.Username, &u.IsAdmin, &u.CreatedAt); err != nil {
			return nil, err
		}
		users = append(users, u)
	}
	return users, rows.Err()
}

// DeleteUser removes a user by ID.
func (s *UserStore) DeleteUser(ctx context.Context, userID string) error {
	_, err := s.pool.Exec(ctx, `DELETE FROM users WHERE user_id = $1`, userID)
	return err
}