/*---------------------------------------------------------
 * Copyright 2022 The Go Authors. All rights reserved.
 * Licensed under the MIT License. See LICENSE in the project root for license information.
 *--------------------------------------------------------*/

import assert from 'assert';
import path from 'path';
import { TreeItem, Uri, window, workspace } from 'vscode';
import { getGoConfig } from '../../src/config';

import { GoExplorerProvider } from '../../src/goExplorer';
import { getRequiredTools } from '../../src/goTools';
import { resolveHomeDir } from '../../src/utils/pathUtils';
import { MockExtensionContext } from '../mocks/MockContext';

suite('GoExplorerProvider', () => {
	const fixtureDir = path.join(__dirname, '../../../test/testdata/baseTest');
	const ctx = MockExtensionContext.new();
	let explorer: GoExplorerProvider;

	suiteSetup(async () => {
		explorer = GoExplorerProvider.setup(ctx);
		const uri = Uri.file(path.join(fixtureDir, 'test.go'));
		await workspace.openTextDocument(uri);
		await window.showTextDocument(uri);
	});

	suiteTeardown(() => {
		ctx.teardown();
	});

	// The GoExplorerProvider extends vscode.TreeDataProvider,
	// and presents tree view consisting of:
	//   + env (env variable tree)
	//      + GOENV
	//      + GOMOD
	//      + ....
	//   + tools (tools info tree)
	//      + various tools
	//      + ....
	// The ordering of children is deterministric. Env tree comes
	// before Tools tree in the current implementation.
	//
	// Env tree changes depending on the open file.
	// Tools tree is the list of tools used for the window and remains static.
	test('env tree', async () => {
		const [env] = await explorer.getChildren()!; // the first level has two children [env, tool]
		assert.strictEqual(env.label, 'env');
		assert.strictEqual(env.contextValue, 'go:explorer:envtree');
	});

	test('env tree items', async () => {
		const [env] = await explorer.getChildren()!;
		const items = (await explorer.getChildren(env)) as { key: string; value: string }[];
		for (const key of ['GOENV', 'GOTOOLCHAIN', 'GOMOD']) {
			const item = items.find((item) => item.key === key);
			assert(item, `missing ${key}: ${JSON.stringify(items)}`);
			if (key === 'GOMOD') {
				assert.strictEqual(resolveHomeDir(item.value), path.join(fixtureDir, 'go.mod'));
			}
		}
	});

	test('tools tree', async () => {
		const [, tools] = await explorer.getChildren()!;
		assert(tools.label === 'tools');
		assert.strictEqual(tools.contextValue, 'go:explorer:tools');
	});

	test('tools tree items', async () => {
		const allTools = getRequiredTools(getGoConfig());
		const expectTools = allTools.map((t) => t.name);
		const [, tools] = await explorer.getChildren()!;
		const items = (await explorer.getChildren(tools)) as TreeItem[];
		for (const idx in items) {
			assert(
				items[idx].label?.toString().startsWith(expectTools[idx]),
				`Unexpected tool tree item with label "${items[idx].label}"`
			);
		}
	});
});