grindlemire/go-tui code browser

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package tui

import (
	"testing"
)

func TestFocusManager_Unregister(t *testing.T) {
	type tc struct {
		elements          []*mockFocusable
		unregisterIndex   int
		expectedFocusedID string
		expectBlurCall    bool
	}

	tests := map[string]tc{
		"unregister non-focused element": {
			elements: []*mockFocusable{
				newMockFocusable("a", true),
				newMockFocusable("b", true),
			},
			unregisterIndex:   1,
			expectedFocusedID: "a",
			expectBlurCall:    false,
		},
		"unregister focused element moves to next": {
			elements: []*mockFocusable{
				newMockFocusable("a", true),
				newMockFocusable("b", true),
			},
			unregisterIndex:   0,
			expectedFocusedID: "b",
			expectBlurCall:    true,
		},
		"unregister last focused wraps to first": {
			elements: []*mockFocusable{
				newMockFocusable("a", true),
				newMockFocusable("b", true),
			},
			unregisterIndex:   1, // Move focus to b first, then unregister
			expectedFocusedID: "a",
			expectBlurCall:    false, // b was not focused when unregistered
		},
	}

	for name, tt := range tests {
		t.Run(name, func(t *testing.T) {
			fm := newFocusManager()
			registerAll(fm, tt.elements...)

			// Seed focus on element 0 (no auto-focus)
			fm.SetFocus(tt.elements[0])

			toUnregister := tt.elements[tt.unregisterIndex]
			initialBlurCalls := toUnregister.blurCalls

			fm.Unregister(toUnregister)

			focused := fm.Focused()
			if focused == nil {
				t.Fatal("Focused() returned nil after unregister")
			}

			mf := focused.(*mockFocusable)
			if mf.id != tt.expectedFocusedID {
				t.Errorf("After Unregister(), focused = %q, want %q", mf.id, tt.expectedFocusedID)
			}

			if tt.expectBlurCall && toUnregister.blurCalls == initialBlurCalls {
				t.Error("Expected Blur() to be called on unregistered element")
			}
		})
	}
}

func TestFocusManager_UnregisterLast(t *testing.T) {
	a := newMockFocusable("a", true)
	fm := newFocusManager()
	fm.Register(a)

	fm.Unregister(a)

	if fm.Focused() != nil {
		t.Error("After unregistering last element, Focused() should be nil")
	}
}

func TestFocusManager_Dispatch(t *testing.T) {
	type tc struct {
		handled        bool
		expectedReturn bool
	}

	tests := map[string]tc{
		"event handled": {
			handled:        true,
			expectedReturn: true,
		},
		"event not handled": {
			handled:        false,
			expectedReturn: false,
		},
	}

	for name, tt := range tests {
		t.Run(name, func(t *testing.T) {
			mock := newMockFocusable("a", true)
			mock.handled = tt.handled

			fm := newFocusManager()
			fm.Register(mock)
			fm.SetFocus(mock)

			event := KeyEvent{Key: KeyEnter}
			result := fm.Dispatch(event)

			if result != tt.expectedReturn {
				t.Errorf("Dispatch() = %v, want %v", result, tt.expectedReturn)
			}

			ke, ok := mock.lastEvent.(KeyEvent)
			if !ok {
				t.Fatal("HandleEvent was not called with KeyEvent")
			}
			if ke.Key != KeyEnter {
				t.Errorf("HandleEvent received wrong event: %+v", ke)
			}
		})
	}
}

func TestFocusManager_DispatchNoFocusedElement(t *testing.T) {
	fm := newFocusManager() // Empty manager

	result := fm.Dispatch(KeyEvent{Key: KeyEnter})

	if result != false {
		t.Error("Dispatch() with no focused element should return false")
	}
}

func TestFocusManager_BlurOnFocusChange(t *testing.T) {
	a := newMockFocusable("a", true)
	b := newMockFocusable("b", true)

	fm := newFocusManager()
	fm.Register(a)
	fm.Register(b)

	// Seed focus on a
	fm.SetFocus(a)

	// Reset counters after SetFocus
	a.focusCalls = 0
	a.blurCalls = 0

	// Move to next (b)
	fm.Next()

	// a should be blurred
	if a.blurCalls != 1 {
		t.Errorf("After Next(), blurCalls for a = %d, want 1", a.blurCalls)
	}

	// b should be focused
	if b.focusCalls != 1 {
		t.Errorf("After Next(), focusCalls for b = %d, want 1", b.focusCalls)
	}
}

func TestFocusManager_SkipsNonFocusableInCycle(t *testing.T) {
	a := newMockFocusable("a", true)
	b := newMockFocusable("b", false) // Not focusable
	c := newMockFocusable("c", true)

	fm := newFocusManager()
	fm.Register(a)
	fm.Register(b)
	fm.Register(c)

	// First Next() focuses a
	fm.Next()
	focused := fm.Focused().(*mockFocusable)
	if focused.id != "a" {
		t.Fatalf("After first Next(), focus = %q, want 'a'", focused.id)
	}

	// Next should skip b and go to c
	fm.Next()
	focused = fm.Focused().(*mockFocusable)
	if focused.id != "c" {
		t.Errorf("After second Next(), focus = %q, want 'c'", focused.id)
	}

	// Next should wrap to a (skip b)
	fm.Next()
	focused = fm.Focused().(*mockFocusable)
	if focused.id != "a" {
		t.Errorf("After third Next(), focus = %q, want 'a'", focused.id)
	}
}

func TestFocusManager_EmptyNext(t *testing.T) {
	fm := newFocusManager()

	// Should not panic
	fm.Next()

	if fm.Focused() != nil {
		t.Error("Next() on empty manager should not set focus")
	}
}

func TestFocusManager_EmptyPrev(t *testing.T) {
	fm := newFocusManager()

	// Should not panic
	fm.Prev()

	if fm.Focused() != nil {
		t.Error("Prev() on empty manager should not set focus")
	}
}