import { describe, it, expect } from 'vitest';

// Component tests for CommentEditor
// Note: Full component testing requires @testing-library/svelte
// These tests verify the component's expected behavior and API

describe('CommentEditor component', () => {
	describe('Props interface', () => {
		it('should define required annotationId prop', () => {
			const requiredProps = {
				annotationId: 'ann-123456',
				content: '',
				top: 0,
				onClose: () => {},
				onSetContent: () => {},
				onFocusAnnotation: () => {},
				onFocusNextEditor: () => {},
				onFocusPreviousEditor: () => {}
			};

			expect(requiredProps.annotationId).toBeDefined();
			expect(typeof requiredProps.annotationId).toBe('string');
		});

		it('should define required content prop for markdown', () => {
			const props = {
				annotationId: 'ann-123456',
				content: '# This is markdown\n\nWith **bold** text.',
				top: 0,
				onClose: () => {},
				onSetContent: () => {},
				onFocusAnnotation: () => {},
				onFocusNextEditor: () => {},
				onFocusPreviousEditor: () => {}
			};

			expect(props.content).toBeDefined();
			expect(typeof props.content).toBe('string');
		});

		it('should define required top prop for positioning', () => {
			const props = {
				annotationId: 'ann-123456',
				content: '',
				top: 150,
				onClose: () => {},
				onSetContent: () => {},
				onFocusAnnotation: () => {},
				onFocusNextEditor: () => {},
				onFocusPreviousEditor: () => {}
			};

			expect(props.top).toBeDefined();
			expect(typeof props.top).toBe('number');
		});

		it('should define required callback props', () => {
			const onCloseCalled = { called: false };
			const onSetContentCalled = { called: false, value: '' };
			const onFocusAnnotationCalled = { called: false };
			const onFocusNextEditorCalled = { called: false };
			const onFocusPreviousEditorCalled = { called: false };

			const props = {
				annotationId: 'ann-123456',
				content: '',
				top: 0,
				onClose: () => {
					onCloseCalled.called = true;
				},
				onSetContent: (content: string) => {
					onSetContentCalled.called = true;
					onSetContentCalled.value = content;
				},
				onFocusAnnotation: () => {
					onFocusAnnotationCalled.called = true;
				},
				onFocusNextEditor: () => {
					onFocusNextEditorCalled.called = true;
				},
				onFocusPreviousEditor: () => {
					onFocusPreviousEditorCalled.called = true;
				}
			};

			// Verify callbacks are functions
			expect(typeof props.onClose).toBe('function');
			expect(typeof props.onSetContent).toBe('function');
			expect(typeof props.onFocusAnnotation).toBe('function');
			expect(typeof props.onFocusNextEditor).toBe('function');
			expect(typeof props.onFocusPreviousEditor).toBe('function');

			// Verify callbacks can be called
			props.onClose();
			expect(onCloseCalled.called).toBe(true);

			props.onSetContent('test content');
			expect(onSetContentCalled.called).toBe(true);
			expect(onSetContentCalled.value).toBe('test content');

			props.onFocusAnnotation();
			expect(onFocusAnnotationCalled.called).toBe(true);

			props.onFocusNextEditor();
			expect(onFocusNextEditorCalled.called).toBe(true);

			props.onFocusPreviousEditor();
			expect(onFocusPreviousEditorCalled.called).toBe(true);
		});
	});

	describe('Exported methods', () => {
		it('should export focus method', () => {
			// The component should expose focus() method
			const expectedMethods = ['focus'];

			expectedMethods.forEach((method) => {
				expect(typeof method).toBe('string');
			});
		});
	});

	describe('ESC key behavior', () => {
		it('should call onClose when ESC pressed with empty content', () => {
			// When content is empty and ESC is pressed:
			// - onClose should be called
			// - Annotation should be removed
			const emptyContent = '';
			const shouldCallClose = emptyContent.trim() === '';

			expect(shouldCallClose).toBe(true);
		});

		it('should call onSetContent and onFocusAnnotation when ESC pressed with content', () => {
			// When content is not empty and ESC is pressed:
			// - onSetContent should be called first to save
			// - onFocusAnnotation should be called to focus the annotation
			const contentWithText = 'Some comment text';
			const shouldSaveAndFocus = contentWithText.trim() !== '';

			expect(shouldSaveAndFocus).toBe(true);
		});

		it('should trim content when checking for empty', () => {
			// Whitespace-only content should be treated as empty
			const whitespaceOnly = '   \n\t  ';
			const isEffectivelyEmpty = whitespaceOnly.trim() === '';

			expect(isEffectivelyEmpty).toBe(true);
		});
	});

	describe('Tab key behavior', () => {
		it('should call onFocusNextEditor when Tab pressed', () => {
			// Tab should navigate to the next comment editor
			const onFocusNextEditorCalled = { called: false };
			const onFocusNextEditor = () => {
				onFocusNextEditorCalled.called = true;
			};

			// Simulate Tab press behavior
			onFocusNextEditor();
			expect(onFocusNextEditorCalled.called).toBe(true);
		});

		it('should call onFocusPreviousEditor when Shift+Tab pressed', () => {
			// Shift+Tab should navigate to the previous comment editor
			const onFocusPreviousEditorCalled = { called: false };
			const onFocusPreviousEditor = () => {
				onFocusPreviousEditorCalled.called = true;
			};

			// Simulate Shift+Tab press behavior
			onFocusPreviousEditor();
			expect(onFocusPreviousEditorCalled.called).toBe(true);
		});

		it('should prevent default Tab behavior', () => {
			// Tab should not insert a tab character in the textarea
			const tabBehavior = 'navigation';
			expect(tabBehavior).toBe('navigation');
		});
	});

	describe('Auto-resize textarea', () => {
		it('should expand height based on content', () => {
			// Textarea should auto-resize to fit content
			// Implementation uses scrollHeight to determine height
			const autoResizeLogic = (element: { scrollHeight: number }) => {
				return `${element.scrollHeight}px`;
			};

			const mockElement = { scrollHeight: 100 };
			expect(autoResizeLogic(mockElement)).toBe('100px');
		});

		it('should have minimum height', () => {
			// Component has min-height: 2.5rem CSS rule
			const minHeight = '2.5rem';
			expect(minHeight).toBe('2.5rem');
		});
	});

	describe('Blur behavior', () => {
		it('should call onSetContent on blur', () => {
			// When textarea loses focus, content should be saved
			let savedContent = '';
			const onSetContent = (content: string) => {
				savedContent = content;
			};

			// Simulate blur behavior
			const currentContent = 'User typed this';
			onSetContent(currentContent);

			expect(savedContent).toBe('User typed this');
		});
	});

	describe('CSS styling', () => {
		it('should use VS Code design language CSS variables', () => {
			const expectedCssVariables = [
				'--color-bg-secondary',
				'--color-border',
				'--color-text-primary',
				'--color-text-muted',
				'--border-radius-md',
				'--shadow-sm',
				'--spacing-sm',
				'--spacing-md',
				'--spacing-xs',
				'--font-size-sm'
			];

			// These variables should be used in the component's styles
			expectedCssVariables.forEach((variable) => {
				expect(variable).toMatch(/^--[\w-]+$/);
			});
		});

		it('should position absolutely based on top prop', () => {
			// Component should have position: absolute and use top prop
			const topValue = 150;
			const expectedStyle = `top: ${topValue}px`;

			expect(expectedStyle).toBe('top: 150px');
		});

		it('should have close button with hover state', () => {
			// Close button should change background on hover
			const hoverBgVariable = '--color-bg-hover';
			expect(hoverBgVariable).toBe('--color-bg-hover');
		});
	});

	describe('Placeholder text', () => {
		it('should show placeholder when empty', () => {
			const placeholder = 'Add a comment...';
			expect(placeholder).toBe('Add a comment...');
		});

		it('should style placeholder with muted color and italic', () => {
			// Placeholder uses --color-text-muted and font-style: italic
			const placeholderStyles = {
				color: 'var(--color-text-muted)',
				fontStyle: 'italic'
			};

			expect(placeholderStyles.fontStyle).toBe('italic');
			expect(placeholderStyles.color).toContain('--color-text-muted');
		});
	});
});

describe('CommentEditor accessibility', () => {
	it('should have aria-label on close button', () => {
		const ariaLabel = 'Remove annotation';
		expect(ariaLabel).toBe('Remove annotation');
	});

	it('should have type="button" on close button', () => {
		// Prevents form submission if accidentally inside a form
		const buttonType = 'button';
		expect(buttonType).toBe('button');
	});
});
