package membership

// Golden strings verified against scripts/calculate_fees.py on 2026-05-06:
//
//	PYTHONPATH=scripts:. python scripts/calculate_fees.py
//
// (feed equivalent fixture data via attendance sheet or local CSV)

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

func TestPrintFeesTableAdultsOnly(t *testing.T) {
	t.Parallel()
	members := []reconcile.Member{
		{Name: "Alice", Tier: "A", Fees: map[string]reconcile.FeeData{
			"2026-03": {Expected: 0, Attendance: 0},
			"2026-04": {Expected: 200, Attendance: 1},
			"2026-05": {Expected: 700, Attendance: 3},
		}},
		{Name: "Bob", Tier: "A", Fees: map[string]reconcile.FeeData{
			"2026-03": {Expected: 350, Attendance: 2},
			"2026-04": {Expected: 700, Attendance: 4},
			"2026-05": {Expected: 0, Attendance: 0},
		}},
		// Junior — must be excluded from table
		{Name: "Carol", Tier: "J", Fees: map[string]reconcile.FeeData{
			"2026-04": {Expected: 0, Attendance: 1},
		}},
	}
	sortedMonths := []string{"2026-03", "2026-04", "2026-05"}

	var buf bytes.Buffer
	printFeesTable(&buf, members, sortedMonths)
	got := buf.String()

	// Verify structure
	if !strings.Contains(got, "Member") {
		t.Error("missing header 'Member'")
	}
	if !strings.Contains(got, "Mar 2026") || !strings.Contains(got, "Apr 2026") || !strings.Contains(got, "May 2026") {
		t.Error("missing month labels")
	}
	if strings.Contains(got, "Carol") {
		t.Error("junior member Carol must not appear in fees table")
	}
	// Alice Apr: 1 attendance → "200 CZK (1)"
	if !strings.Contains(got, "200 CZK (1)") {
		t.Errorf("expected single-session fee '200 CZK (1)', got:\n%s", got)
	}
	// Alice Mar: 0 attendance → "-"
	lines := strings.Split(got, "\n")
	aliceLine := ""
	for _, l := range lines {
		if strings.HasPrefix(strings.TrimSpace(l), "Alice") {
			aliceLine = l
			break
		}
	}
	if aliceLine == "" {
		t.Fatal("no Alice line found")
	}
	// Alice's first col (Mar 2026) should be "-"
	if !strings.Contains(aliceLine, "-") {
		t.Errorf("expected '-' for zero attendance in Alice line: %q", aliceLine)
	}
	// TOTAL row
	if !strings.Contains(got, "TOTAL") {
		t.Error("missing TOTAL row")
	}
	// Total for May 2026 = 700 CZK
	if !strings.Contains(got, "700 CZK") {
		t.Errorf("expected '700 CZK' in totals, got:\n%s", got)
	}
}

func TestPrintFeesTableNoAdults(t *testing.T) {
	t.Parallel()
	members := []reconcile.Member{
		{Name: "X", Tier: "J", Fees: map[string]reconcile.FeeData{}},
	}
	var buf bytes.Buffer
	printFeesTable(&buf, members, []string{"2026-04"})
	if buf.String() != "No data.\n" {
		t.Errorf("want 'No data.', got %q", buf.String())
	}
}

func TestPrintFeesTableEmpty(t *testing.T) {
	t.Parallel()
	var buf bytes.Buffer
	printFeesTable(&buf, nil, nil)
	if buf.String() != "No data.\n" {
		t.Errorf("want 'No data.', got %q", buf.String())
	}
}