package display

import "testing"

const wantFallbackText = "Brak połączenia WFB"

func TestFallbackTemplateShowsExactTextWhileVideoAbsent(t *testing.T) {
	canvas := &fakeCanvas{width: 800, height: 600}
	presence := NewVideoPresence()

	NewFallbackTemplate(presence, wantFallbackText).Draw(canvas)

	clears, flushes := canvas.drawCounts()
	if clears != 1 || flushes != 1 {
		t.Fatalf("clears=%d flushes=%d want 1 and 1", clears, flushes)
	}
	lines := canvas.lines()
	if len(lines) != 1 || lines[0] != wantFallbackText {
		t.Fatalf("lines=%q want [%q]", lines, wantFallbackText)
	}
}

func TestFallbackTemplateDisappearsWhileVideoPresent(t *testing.T) {
	canvas := &fakeCanvas{width: 800, height: 600}
	presence := NewVideoPresence()
	presence.SetActive(true)

	NewFallbackTemplate(presence, wantFallbackText).Draw(canvas)

	clears, flushes := canvas.drawCounts()
	if clears != 1 || flushes != 1 {
		t.Fatalf("clears=%d flushes=%d want 1 and 1", clears, flushes)
	}
	if lines := canvas.lines(); len(lines) != 0 {
		t.Fatalf("video has priority: fallback lines %q must disappear", lines)
	}
}

func TestFallbackTemplateReturnsWhenVideoEnds(t *testing.T) {
	canvas := &fakeCanvas{width: 800, height: 600}
	presence := NewVideoPresence()
	presence.SetActive(true)
	template := NewFallbackTemplate(presence, wantFallbackText)

	template.Draw(canvas)
	if lines := canvas.lines(); len(lines) != 0 {
		t.Fatalf("lines=%q must stay empty while video is present", lines)
	}

	presence.SetActive(false)
	template.Draw(canvas)

	lines := canvas.lines()
	if len(lines) != 1 || lines[0] != wantFallbackText {
		t.Fatalf("lines=%q want fallback [%q] after video end", lines, wantFallbackText)
	}
}