package fees

import "testing"

func TestCalculateJuniorFee(t *testing.T) {
	t.Parallel()

	// All expected outputs verified against live Python implementation on 2026-05-06:
	//   PYTHONPATH=scripts:. python -c 'from attendance import calculate_junior_fee; print([calculate_junior_fee(c,m) for c,m in [(0,"2026-05"),(0,""),(1,"2026-05"),(1,"unknown"),(2,"2026-05"),(2,"2025-09"),(2,"2026-03"),(5,"2025-09"),(2,"2027-01"),(2,"")]])'
	tests := []struct {
		name  string
		count int
		month string
		want  Expected
	}{
		{"zero short-circuits", 0, "2026-05", Expected{Value: 0}},
		{"zero empty month", 0, "", Expected{Value: 0}},
		{"single practice sentinel", 1, "2026-05", Expected{Unknown: true}},
		{"single ignores monthKey", 1, "unknown", Expected{Unknown: true}},
		{"two practices default month", 2, "2026-05", Expected{Value: 500}},
		{"two practices reduced sept", 2, "2025-09", Expected{Value: 250}},
		{"two practices reduced march", 2, "2026-03", Expected{Value: 250}},
		{"high count same as two", 5, "2025-09", Expected{Value: 250}},
		{"unknown future month falls back", 2, "2027-01", Expected{Value: 500}},
		{"empty month falls back", 2, "", Expected{Value: 500}},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			got := CalculateJuniorFee(tc.count, tc.month)
			if got != tc.want {
				t.Errorf("CalculateJuniorFee(%d, %q) = %+v, want %+v", tc.count, tc.month, got, tc.want)
			}
		})
	}
}