import CodeMirror5Emulation from './CodeMirror5Emulation';
import { EditorView } from '@codemirror/view';

const makeCodeMirrorEmulation = (initialDocText: string) => {
	const editorView = new EditorView({
		doc: initialDocText,
	});
	return new CodeMirror5Emulation(editorView, ()=>{});
};

describe('CodeMirror5Emulation', () => {
	it('getSearchCursor should support searching for strings', () => {
		const codeMirror = makeCodeMirrorEmulation('testing --- this is a test.');

		// Should find two matches for "test"
		// Note that the CodeMirror documentation specifies that a search cursor
		// should return a boolean when calling findNext/findPrevious. However,
		// the codemirror-vim adapter returns just a truthy/falsy value.
		const testCursor = codeMirror.getSearchCursor('test');
		expect(testCursor.findNext()).toBeTruthy();
		expect(testCursor.findNext()).toBeTruthy();

		// Replace the second match
		testCursor.replace('passing test');
		expect(codeMirror.getValue()).toBe('testing --- this is a passing test.');

		// Should also be able to find previous matches
		expect(testCursor.findPrevious()).toBeTruthy();

		// Should return a falsy value when attempting to search past the end of
		// the document.
		expect(testCursor.findPrevious()).toBeFalsy();
	});

	it('should fire update/change events on change', async () => {
		const codeMirror = makeCodeMirrorEmulation('testing --- this is a test.');

		const updateCallback = jest.fn();
		const changeCallback = jest.fn();
		codeMirror.on('update', updateCallback);
		codeMirror.on('change', changeCallback);

		expect(updateCallback).not.toHaveBeenCalled();
		expect(changeCallback).not.toHaveBeenCalled();

		jest.useFakeTimers();

		// Inserting text should trigger the update and change events
		codeMirror.editor.dispatch({
			changes: { from: 0, to: 1, insert: 'Test: ' },
		});

		// Advance timers -- there may be a delay between the CM 6 event
		// and the dispatched CM 5 event.
		await jest.advanceTimersByTimeAsync(100);

		expect(updateCallback).toHaveBeenCalled();
		expect(changeCallback).toHaveBeenCalled();

		// The change callback should be given two arguments:
		// - the CodeMirror emulation object
		// - a description of the changes
		expect(changeCallback.mock.lastCall[0]).toBe(codeMirror);
		expect(changeCallback.mock.lastCall[1]).toMatchObject({
			from: { line: 0, ch: 0 },
			to: { line: 0, ch: 1 },

			// Arrays of lines
			text: ['Test: '],
			removed: ['t'],
		});
	});

	it('defineOption should fire the option\'s update callback on change', () => {
		const codeMirror = makeCodeMirrorEmulation('Test 1\nTest 2');

		const onOptionUpdate = jest.fn();
		codeMirror.defineOption('an-option!', 'test', onOptionUpdate);

		const onOtherOptionUpdate = jest.fn();
		codeMirror.defineOption('an-option 2', 1, onOtherOptionUpdate);


		// onUpdate should be called once initially
		expect(onOtherOptionUpdate).toHaveBeenCalledTimes(1);
		expect(onOptionUpdate).toHaveBeenCalledTimes(1);
		expect(onOptionUpdate).toHaveBeenLastCalledWith(
			codeMirror,

			// default value -- the new value
			'test',

			// the original value (none, so given CodeMirror.Init)
			codeMirror.Init,
		);

		// onUpdate should be called each time the option changes
		codeMirror.setOption('an-option!', 'test 2');
		expect(onOptionUpdate).toHaveBeenCalledTimes(2);
		expect(onOptionUpdate).toHaveBeenLastCalledWith(
			codeMirror, 'test 2', 'test',
		);

		codeMirror.setOption('an-option!', 'test...');
		expect(onOptionUpdate).toHaveBeenCalledTimes(3);

		// The other update callback should not have been triggered
		// additional times if its option hasn't updated.
		expect(onOtherOptionUpdate).toHaveBeenCalledTimes(1);
	});

	it('defineExtension should override previous extensions with the same name', () => {
		const codeMirror = makeCodeMirrorEmulation('Test...');
		const testExtensionFn1 = jest.fn();
		const testExtensionFn2 = jest.fn();

		codeMirror.defineExtension('defineExtensionShouldOverride', testExtensionFn1);

		(codeMirror as any).defineExtensionShouldOverride();
		expect(testExtensionFn1).toHaveBeenCalledTimes(1);
		expect(testExtensionFn2).toHaveBeenCalledTimes(0);

		codeMirror.defineExtension('defineExtensionShouldOverride', testExtensionFn2);

		(codeMirror as any).defineExtensionShouldOverride();
		expect(testExtensionFn1).toHaveBeenCalledTimes(1);
		expect(testExtensionFn2).toHaveBeenCalledTimes(1);
	});
});