package main

import (
	"bytes"
	"strings"
	"testing"

	"netdome.biz/paul/qmk-rgb/internal/via"
)

func runBrightness(t *testing.T, applied map[via.Channel]uint8, zone string, arg string) (stdout, stderr string) {
	t.Helper()

	proto := &verifyingProtocol{applied: applied}
	t.Cleanup(impact80Target(t, proto))

	var out, errOut bytes.Buffer
	cmd := NewBrightnessCmd()
	cmd.SetOut(&out)
	cmd.SetErr(&errOut)
	cmd.SetArgs([]string{zone, arg})

	if err := cmd.Execute(); err != nil {
		t.Fatalf("brightness returned error: %v", err)
	}
	return out.String(), errOut.String()
}

// A success message that says "set to 200" while the keyboard holds 160 is a
// contradiction. Where every zone applied the request, the plain message is
// accurate and stays.
func TestBrightnessReportsPlainMessageWhenAllZonesMatch(t *testing.T) {
	stdout, stderr := runBrightness(t, map[via.Channel]uint8{via.ChannelRgblight: 200}, "logo", "200")

	if strings.TrimSpace(stdout) != "Brightness set to 200" {
		t.Errorf("stdout = %q, want the exact success message", stdout)
	}
	if stderr != "" {
		t.Errorf("stderr = %q, want nothing on stderr when the request was met", stderr)
	}
}

// Where a zone differs, one line must state what each zone actually holds.
func TestBrightnessSummarisesAppliedValuesOnMismatch(t *testing.T) {
	stdout, _ := runBrightness(t, map[via.Channel]uint8{
		via.ChannelRgblight:  160,
		via.ChannelRgbMatrix: 255,
		via.ChannelAudio:     160,
	}, "all", "200")

	for _, want := range []string{"logo 160", "backlight 255", "side 160", "requested 200"} {
		if !strings.Contains(stdout, want) {
			t.Errorf("stdout = %q, want it to contain %q", stdout, want)
		}
	}
	if strings.Contains(stdout, "set to 200") {
		t.Errorf("stdout = %q, must not claim 200 was set when it was not", stdout)
	}
	if strings.Count(strings.TrimSpace(stdout), "\n") != 0 {
		t.Errorf("stdout = %q, want exactly one line", stdout)
	}
}

func TestBrightnessSummarisesASingleMismatchingZone(t *testing.T) {
	// backlight lives on the RGBMatrix channel, not RGBLight.
	stdout, _ := runBrightness(t, map[via.Channel]uint8{via.ChannelRgbMatrix: 159}, "backlight", "100")

	if !strings.Contains(stdout, "backlight 159") || !strings.Contains(stdout, "requested 100") {
		t.Errorf("stdout = %q, want the single zone's applied value and the request", stdout)
	}
	if strings.Contains(stdout, "logo") || strings.Contains(stdout, "side") {
		t.Errorf("stdout = %q, want only the selected zone named", stdout)
	}
}

// The summary must not invent zones the user did not select.
func TestBrightnessSummaryNamesOnlySelectedZones(t *testing.T) {
	proto := &verifyingProtocol{applied: map[via.Channel]uint8{via.ChannelAudio: 160}}
	t.Cleanup(impact80Target(t, proto))

	var out bytes.Buffer
	cmd := NewBrightnessCmd()
	cmd.SetOut(&out)
	cmd.SetErr(&out)
	cmd.SetArgs([]string{"side", "200"})

	if err := cmd.Execute(); err != nil {
		t.Fatalf("brightness returned error: %v", err)
	}

	if !strings.Contains(out.String(), "side 160") {
		t.Errorf("stdout = %q, want side reported", out.String())
	}
	for _, unwanted := range []string{"logo", "backlight"} {
		if strings.Contains(out.String(), unwanted) {
			t.Errorf("stdout = %q, must not mention %s when only side was selected", out.String(), unwanted)
		}
	}
}