/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import * as assert from 'assert';
import 'mocha';
import * as vscode from 'vscode';
import SymbolProvider from '../features/documentSymbolProvider';
import { InMemoryDocument } from './inMemoryDocument';
import { createNewMarkdownEngine } from './engine';


const testFileName = vscode.Uri.file('test.md');


function getSymbolsForFile(fileContents: string) {
	const doc = new InMemoryDocument(testFileName, fileContents);
	const provider = new SymbolProvider(createNewMarkdownEngine());
	return provider.provideDocumentSymbols(doc);
}


suite('markdown.DocumentSymbolProvider', () => {
	test('Should not return anything for empty document', async () => {
		const symbols = await getSymbolsForFile('');
		assert.strictEqual(symbols.length, 0);
	});

	test('Should not return anything for document with no headers', async () => {
		const symbols = await getSymbolsForFile('a\na');
		assert.strictEqual(symbols.length, 0);
	});

	test('Should not return anything for document with # but no real headers', async () => {
		const symbols = await getSymbolsForFile('a#a\na#');
		assert.strictEqual(symbols.length, 0);
	});

	test('Should return single symbol for single header', async () => {
		const symbols = await getSymbolsForFile('# h');
		assert.strictEqual(symbols.length, 1);
		assert.strictEqual(symbols[0].name, '# h');
	});

	test('Should not care about symbol level for single header', async () => {
		const symbols = await getSymbolsForFile('### h');
		assert.strictEqual(symbols.length, 1);
		assert.strictEqual(symbols[0].name, '### h');
	});

	test('Should put symbols of same level in flat list', async () => {
		const symbols = await getSymbolsForFile('## h\n## h2');
		assert.strictEqual(symbols.length, 2);
		assert.strictEqual(symbols[0].name, '## h');
		assert.strictEqual(symbols[1].name, '## h2');
	});

	test('Should nest symbol of level - 1 under parent', async () => {

		const symbols = await getSymbolsForFile('# h\n## h2\n## h3');
		assert.strictEqual(symbols.length, 1);
		assert.strictEqual(symbols[0].name, '# h');
		assert.strictEqual(symbols[0].children.length, 2);
		assert.strictEqual(symbols[0].children[0].name, '## h2');
		assert.strictEqual(symbols[0].children[1].name, '## h3');
	});

	test('Should nest symbol of level - n under parent', async () => {
		const symbols = await getSymbolsForFile('# h\n#### h2');
		assert.strictEqual(symbols.length, 1);
		assert.strictEqual(symbols[0].name, '# h');
		assert.strictEqual(symbols[0].children.length, 1);
		assert.strictEqual(symbols[0].children[0].name, '#### h2');
	});

	test('Should flatten children where lower level occurs first', async () => {
		const symbols = await getSymbolsForFile('# h\n### h2\n## h3');
		assert.strictEqual(symbols.length, 1);
		assert.strictEqual(symbols[0].name, '# h');
		assert.strictEqual(symbols[0].children.length, 2);
		assert.strictEqual(symbols[0].children[0].name, '### h2');
		assert.strictEqual(symbols[0].children[1].name, '## h3');
	});

	test('Should handle line separator in file. Issue #63749', async () => {
		const symbols = await getSymbolsForFile(`# A
- foo


# B
- bar`);
		assert.strictEqual(symbols.length, 2);
		assert.strictEqual(symbols[0].name, '# A');
		assert.strictEqual(symbols[1].name, '# B');
	});
});