package membership

import (
	"bytes"
	"context"
	"fuj-management/go/internal/domain/reconcile"
	"strings"
	"testing"
)

type fakeAttendanceLoader struct {
	members []reconcile.Member
	months  []string
}

func (f fakeAttendanceLoader) LoadAdults(_ context.Context) ([]reconcile.Member, []string, error) {
	return f.members, f.months, nil
}

func (f fakeAttendanceLoader) LoadJuniors(_ context.Context) ([]reconcile.Member, []string, error) {
	return nil, nil, nil
}

func TestFeesReport(t *testing.T) {
	t.Parallel()
	loader := fakeAttendanceLoader{
		members: []reconcile.Member{
			{Name: "Alice", Tier: "A", Fees: map[string]reconcile.FeeData{
				"2026-04": {Expected: 700, Attendance: 3},
			}},
		},
		months: []string{"2026-04"},
	}

	var buf bytes.Buffer
	if err := FeesReport(context.Background(), loader, &buf); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if !strings.Contains(buf.String(), "700 CZK (3)") {
		t.Errorf("expected '700 CZK (3)' in output, got:\n%s", buf.String())
	}
}

func TestFeesReportStubErrors(t *testing.T) {
	t.Parallel()
	var buf bytes.Buffer
	err := FeesReport(context.Background(), NewStubSources(), &buf)
	if err == nil {
		t.Fatal("expected error from stub, got nil")
	}
}