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

import * as assert from 'assert';
import * as path from 'path';
import { providePathSuggestions } from '../../modes/pathCompletion';
import { CompletionItemKind, Range, Position, CompletionItem, TextEdit, Command } from 'vscode-languageserver-types';

const fixtureRoot = path.resolve(__dirname, '../../../test/pathCompletionFixtures');

function toRange(line: number, startChar: number, endChar: number) {
	return Range.create(Position.create(line, startChar), Position.create(line, endChar));
}
function toTextEdit(line: number, startChar: number, endChar: number, newText: string) {
	const range = Range.create(Position.create(line, startChar), Position.create(line, endChar));
	return TextEdit.replace(range, newText);
}

interface PathSuggestion {
	label?: string;
	kind?: CompletionItemKind;
	textEdit?: TextEdit;
	command?: Command;
}

function assertSuggestions(actual: CompletionItem[], expected: PathSuggestion[]) {
	assert.equal(actual.length, expected.length, `Suggestions have length ${actual.length} but should have length ${expected.length}`);

	for (let i = 0; i < expected.length; i++) {
		if (expected[i].label) {
			assert.equal(
				actual[i].label,
				expected[i].label,
				`Suggestion ${actual[i].label} should have label ${expected[i].label}`
			);
		}
		if (expected[i].kind) {
			assert.equal(actual[i].kind,
				expected[i].kind,
				`Suggestion ${actual[i].label} has kind ${actual[i].kind} but should have ${expected[i].kind}`
			);
		}
		if (expected[i].textEdit) {
			assert.equal(actual[i].textEdit!.newText, expected[i].textEdit!.newText);
			assert.deepEqual(actual[i].textEdit!.range, expected[i].textEdit!.range);
		}
		if (expected[i].command) {
			assert.equal(
				actual[i].command!.title,
				expected[i].command!.title,
				`Suggestion ${actual[i].label} has command title ${actual[i].command!.title} but should have command title ${expected[i].command!.title}`
			);
			assert.equal(
				actual[i].command!.command,
				expected[i].command!.command,
				`Suggestion ${actual[i].label} has command ${actual[i].command!.command} but should have command ${expected[i].command!.command}`
			);
		}
	}
}

suite('Path Completion - Relative Path:', () => {
	const mockRange = toRange(0, 3, 5);

	test('Current Folder', () => {
		const value = './';
		const activeFileFsPath = path.resolve(fixtureRoot, 'index.html');
		const suggestions = providePathSuggestions(value, mockRange, activeFileFsPath);

		assertSuggestions(suggestions, [
			{ label: 'about/', kind: CompletionItemKind.Folder },
			{ label: 'index.html', kind: CompletionItemKind.File },
			{ label: 'src/', kind: CompletionItemKind.Folder }
		]);
	});

	test('Parent Folder:', () => {
		const value = '../';
		const activeFileFsPath = path.resolve(fixtureRoot, 'about/about.html');
		const suggestions = providePathSuggestions(value, mockRange, activeFileFsPath);

		assertSuggestions(suggestions, [
			{ label: 'about/', kind: CompletionItemKind.Folder },
			{ label: 'index.html', kind: CompletionItemKind.File },
			{ label: 'src/', kind: CompletionItemKind.Folder }
		]);
	});

	test('Adjacent Folder:', () => {
		const value = '../src/';
		const activeFileFsPath = path.resolve(fixtureRoot, 'about/about.html');
		const suggestions = providePathSuggestions(value, mockRange, activeFileFsPath);

		assertSuggestions(suggestions, [
			{ label: 'feature.js', kind: CompletionItemKind.File },
			{ label: 'test.js', kind: CompletionItemKind.File }
		]);
	});
});

suite('Path Completion - Absolute Path:', () => {
	const mockRange = toRange(0, 3, 5);

	test('Root', () => {
		const value = '/';
		const activeFileFsPath1 = path.resolve(fixtureRoot, 'index.html');
		const activeFileFsPath2 = path.resolve(fixtureRoot, 'about/index.html');

		const suggestions1 = providePathSuggestions(value, mockRange, activeFileFsPath1, fixtureRoot);
		const suggestions2 = providePathSuggestions(value, mockRange, activeFileFsPath2, fixtureRoot);

		const verify = (suggestions: CompletionItem[]) => {
			assertSuggestions(suggestions, [
				{ label: 'about/', kind: CompletionItemKind.Folder },
				{ label: 'index.html', kind: CompletionItemKind.File },
				{ label: 'src/', kind: CompletionItemKind.Folder }
			]);
		};

		verify(suggestions1);
		verify(suggestions2);
	});

	test('Sub Folder', () => {
		const value = '/src/';
		const activeFileFsPath = path.resolve(fixtureRoot, 'about/about.html');
		const suggestions = providePathSuggestions(value, mockRange, activeFileFsPath, fixtureRoot);

		assertSuggestions(suggestions, [
			{ label: 'feature.js', kind: CompletionItemKind.File },
			{ label: 'test.js', kind: CompletionItemKind.File }
		]);
	});
});

suite('Path Completion - Folder Commands:', () => {
	const mockRange = toRange(0, 3, 5);

	test('Folder should have command `editor.action.triggerSuggest', () => {
		const value = './';
		const activeFileFsPath = path.resolve(fixtureRoot, 'index.html');
		const suggestions = providePathSuggestions(value, mockRange, activeFileFsPath);

		assertSuggestions(suggestions, [
			{ label: 'about/', command: { title: 'Suggest', command: 'editor.action.triggerSuggest' } },
			{ label: 'index.html' },
			{ label: 'src/', command: { title: 'Suggest', command: 'editor.action.triggerSuggest' } },
		]);
	});
});

suite('Path Completion - Incomplete Path at End:', () => {
	const mockRange = toRange(0, 3, 5);

	test('Incomplete Path that starts with slash', () => {
		const value = '/src/f';
		const activeFileFsPath = path.resolve(fixtureRoot, 'about/about.html');
		const suggestions = providePathSuggestions(value, mockRange, activeFileFsPath, fixtureRoot);

		assertSuggestions(suggestions, [
			{ label: 'feature.js', kind: CompletionItemKind.File },
			{ label: 'test.js', kind: CompletionItemKind.File }
		]);
	});

	test('Incomplete Path that does not start with slash', () => {
		const value = '../src/f';
		const activeFileFsPath = path.resolve(fixtureRoot, 'about/about.html');
		const suggestions = providePathSuggestions(value, mockRange, activeFileFsPath, fixtureRoot);

		assertSuggestions(suggestions, [
			{ label: 'feature.js', kind: CompletionItemKind.File },
			{ label: 'test.js', kind: CompletionItemKind.File }
		]);
	});
});

suite('Path Completion - No leading dot or slash:', () => {

	test('Top level completion', () => {
		const value = 's';
		const activeFileFsPath = path.resolve(fixtureRoot, 'index.html');
		const range = toRange(0, 3, 5);
		const suggestions = providePathSuggestions(value, range, activeFileFsPath, fixtureRoot);

		assertSuggestions(suggestions, [
			{ label: 'about/', kind: CompletionItemKind.Folder, textEdit: toTextEdit(0, 4, 4, 'about/') },
			{ label: 'index.html', kind: CompletionItemKind.File, textEdit: toTextEdit(0, 4, 4, 'index.html') },
			{ label: 'src/', kind: CompletionItemKind.Folder, textEdit: toTextEdit(0, 4, 4, 'src/') }
		]);
	});

	test('src/', () => {
		const value = 'src/';
		const activeFileFsPath = path.resolve(fixtureRoot, 'index.html');
		const range = toRange(0, 3, 8);
		const suggestions = providePathSuggestions(value, range, activeFileFsPath, fixtureRoot);

		assertSuggestions(suggestions, [
			{ label: 'feature.js', kind: CompletionItemKind.File, textEdit: toTextEdit(0, 7, 7, 'feature.js') },
			{ label: 'test.js', kind: CompletionItemKind.File, textEdit: toTextEdit(0, 7, 7, 'test.js') }
		]);
	});

	test('src/f', () => {
		const value = 'src/f';
		const activeFileFsPath = path.resolve(fixtureRoot, 'index.html');
		const range = toRange(0, 3, 9);
		const suggestions = providePathSuggestions(value, range, activeFileFsPath, fixtureRoot);

		assertSuggestions(suggestions, [
			{ label: 'feature.js', kind: CompletionItemKind.File, textEdit: toTextEdit(0, 7, 8, 'feature.js') },
			{ label: 'test.js', kind: CompletionItemKind.File, textEdit: toTextEdit(0, 7, 8, 'test.js') }
		]);
	});
});

suite('Path Completion - TextEdit:', () => {

	test('TextEdit has correct replace text and range', () => {
		const value = './';
		const activeFileFsPath = path.resolve(fixtureRoot, 'index.html');
		const range = toRange(0, 3, 5);
		const expectedReplaceRange = toRange(0, 4, 4);

		const suggestions = providePathSuggestions(value, range, activeFileFsPath);

		assertSuggestions(suggestions, [
			{ textEdit: TextEdit.replace(expectedReplaceRange, 'about/') },
			{ textEdit: TextEdit.replace(expectedReplaceRange, 'index.html') },
			{ textEdit: TextEdit.replace(expectedReplaceRange, 'src/') },
		]);
	});
});