package logic

import (
	"context"

	"spark-server/internal/pkg/errs"
)

// BalanceView is the energy query payload.
type BalanceView struct {
	Energy int64 `json:"energy"`
}

// Balance returns the user's energy wallet (creating an empty one if needed).
func (s *Service) Balance(ctx context.Context, userID int64) (*BalanceView, error) {
	if !s.ready() || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	w, err := s.repo.EnsureWallet(ctx, userID)
	if err != nil {
		return nil, err
	}
	return &BalanceView{Energy: w.Energy}, nil
}