package gel

import (
	"image"
	"testing"
)

func TestClickableCreation(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()

	if click == nil {
		t.Fatal("Clickable() returned nil")
	}
	if click.Window != w {
		t.Error("Clickable Window reference incorrect")
	}
}

func TestClickableEventCallbacks(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()

	// Default callbacks should exist
	if click.Events.Click == nil {
		t.Error("Events.Click should not be nil")
	}
	if click.Events.Cancel == nil {
		t.Error("Events.Cancel should not be nil")
	}
	if click.Events.Press == nil {
		t.Error("Events.Press should not be nil")
	}
}

func TestClickableSetClick(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()

	called := false
	click.SetClick(func() {
		called = true
	})

	// Invoke the callback
	click.Events.Click()
	if !called {
		t.Error("SetClick callback was not set correctly")
	}
}

func TestClickableSetCancel(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()

	called := false
	click.SetCancel(func() {
		called = true
	})

	click.Events.Cancel()
	if !called {
		t.Error("SetCancel callback was not set correctly")
	}
}

func TestClickableSetPress(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()

	called := false
	click.SetPress(func() {
		called = true
	})

	click.Events.Press()
	if !called {
		t.Error("SetPress callback was not set correctly")
	}
}

func TestClickableFn(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()
	gtx := testContext(t, image.Pt(100, 100))

	// Fn should not panic and should return dimensions
	dims := click.Fn(gtx)

	// Clickable by itself doesn't render anything visible, so zero dimensions are expected
	// but it should not panic
	_ = dims
}

func TestClickableHistory(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()

	// History should start empty
	history := click.History()
	if len(history) != 0 {
		t.Errorf("initial history length = %d, want 0", len(history))
	}
}

func TestClickableClicked(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()

	// Without any events, Clicked should return false
	if click.Clicked() {
		t.Error("Clicked() should return false without click events")
	}
}

func TestClickableClicks(t *testing.T) {
	w := testWindow(t)
	click := w.Clickable()

	// Without any events, Clicks should return empty slice
	clicks := click.Clicks()
	if len(clicks) != 0 {
		t.Errorf("Clicks() returned %d clicks, want 0", len(clicks))
	}
}

func TestClickableChainedMethods(t *testing.T) {
	w := testWindow(t)

	clickCalled := false
	pressCalled := false
	cancelCalled := false

	// Test fluent API
	click := w.Clickable().
		SetClick(func() { clickCalled = true }).
		SetPress(func() { pressCalled = true }).
		SetCancel(func() { cancelCalled = true })

	// Verify all callbacks were set
	click.Events.Click()
	click.Events.Press()
	click.Events.Cancel()

	if !clickCalled {
		t.Error("Click callback not set in chain")
	}
	if !pressCalled {
		t.Error("Press callback not set in chain")
	}
	if !cancelCalled {
		t.Error("Cancel callback not set in chain")
	}
}

func BenchmarkClickableFn(b *testing.B) {
	w := testWindow(&testing.T{})
	click := w.Clickable()
	gtx := testContext(&testing.T{}, image.Pt(100, 100))

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		click.Fn(gtx)
	}
}