package cat

import (
	"strings"
	"testing"
)

// RxBands is what stops the decode panel's band-drift warning from lying to a
// station running two slices.
//
// Reported for W4TE: slice A on 20 m with its own WSJT-X, slice B on 40 m
// holding transmit focus. RigState.Band is the TRANSMIT band, so the 20 m
// decoder was told "the rig is on 40M" while the slice it listens to had been
// on 20 m the whole time.
func TestRxBandsAlwaysCarriesTheTransmitBand(t *testing.T) {
	m := &Manager{}
	got := m.rxBands(RigState{FreqHz: 14074000, Band: "20m"})
	if len(got) != 1 || got[0] != "20m" {
		t.Fatalf("got %v, want [20m]", got)
	}
}

// A split rig receives on one band and transmits on another — cross-band split
// is unusual but legal, and the receive side is where a decoder listens.
func TestRxBandsIncludesTheSplitReceiveBand(t *testing.T) {
	m := &Manager{}
	got := m.rxBands(RigState{FreqHz: 14074000, Band: "20m", RxFreqHz: 7074000, Split: true})
	if !has(got, "20m") || !has(got, "40m") {
		t.Fatalf("got %v, want both 20m and 40m", got)
	}
}

// Nothing to report when the rig is on no frequency: an empty list means "there
// is nothing to compare with", and the panel treats it as such rather than as
// "the radio is on no band", which would warn about every decode.
func TestRxBandsIsEmptyWithNoFrequency(t *testing.T) {
	m := &Manager{}
	if got := m.rxBands(RigState{}); len(got) != 0 {
		t.Fatalf("got %v, want nothing", got)
	}
}

// Deduplicated and lower-cased, because the panel compares strings: two slices
// on the same band are one band, and "20M" from a backend must match "20m" from
// BandFromHz.
func TestRxBandsIsNormalised(t *testing.T) {
	m := &Manager{}
	got := m.rxBands(RigState{FreqHz: 14074000, Band: "20M", RxFreqHz: 14080000})
	if len(got) != 1 || got[0] != "20m" {
		t.Fatalf("got %v, want [20m]", got)
	}
	for _, b := range got {
		if b != strings.ToLower(b) {
			t.Errorf("%q is not lower-cased", b)
		}
	}
}

func has(list []string, want string) bool {
	for _, s := range list {
		if s == want {
			return true
		}
	}
	return false
}