package payments

import (
	"context"
	"time"

	customer "git.sendico.io/tech/sxchnge/product/customers/model"
	merrors "git.sendico.io/tech/sxchnge/shared/errors"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promauto"
	"go.uber.org/zap"
)

var accountSetup = promauto.NewCounterVec(prometheus.CounterOpts{Name: "sxchnge_currency_accounts_setup_total", Help: "Default currency account setup attempts, including checks of existing accounts."}, []string{"outcome"})
var accountSetupDuration = promauto.NewHistogram(prometheus.HistogramOpts{Name: "sxchnge_currency_accounts_setup_duration_seconds", Help: "Time to confirm all default currency accounts exist."})

func (s *Service) Ensure(ctx context.Context, a *customer.Account) error {
	_, err := s.ensureAccounts(ctx, a)
	if err != nil {
		return merrors.ServiceUnavailableWrap(err, "currency account setup unavailable")
	}
	return nil
}

func (s *Service) ensureAccounts(ctx context.Context, a *customer.Account) (subject string, result error) {
	started := time.Now()
	defer func() {
		outcome := "ready"
		if result != nil {
			outcome = "failed"
		}
		accountSetup.WithLabelValues(outcome).Inc()
		accountSetupDuration.Observe(time.Since(started).Seconds())
	}()
	if s == nil || s.Identity == nil || s.Provider == nil {
		return "", Unavailable
	}
	if a == nil || a.ID.IsZero() {
		return "", NotFound
	}
	subject, result = s.Identity.Subject(ctx, a)
	if result != nil {
		return "", result
	}
	if result = s.Provider.EnsureAccounts(ctx, subject); result != nil {
		s.Logger.Warn("Currency account setup incomplete", zap.String("account_ref", a.ID.Hex()), zap.Error(result))
		return "", result
	}
	return subject, nil
}