import assert = require('assert');
import path = require('path');
import sinon = require('sinon');
import { Range, TestItem, Uri, workspace } from 'vscode';
import * as testUtils from '../../src/testUtils';
import { forceDidOpenTextDocument } from './goTest.utils';
import { GoTestExplorer } from '../../src/goTest/explore';
import { MockExtensionContext } from '../mocks/MockContext';
import { GoTest } from '../../src/goTest/utils';
import { Env } from './goplsTestEnv.utils';
import { updateGoVarsFromConfig } from '../../src/goInstallTools';

suite('Go Test Runner', () => {
	// updateGoVarsFromConfig mutates process.env. Restore the cached
	// prevEnv when teardown.
	// TODO: avoid updateGoVarsFromConfig call.
	const prevEnv = Object.assign({}, process.env);
	const fixtureDir = path.join(__dirname, '..', '..', '..', 'test', 'testdata');

	let testExplorer: GoTestExplorer;

	suiteSetup(async () => {
		await updateGoVarsFromConfig({});
	});
	suiteTeardown(() => {
		process.env = prevEnv;
	});

	suite('parseOutput', () => {
		const ctx = MockExtensionContext.new();
		suiteSetup(async () => {
			testExplorer = GoTestExplorer.new(ctx, {});
			ctx.subscriptions.push(testExplorer);
		});
		suiteTeardown(() => ctx.teardown());

		const fileURI = Uri.parse('file:///path/to/mod/file.go');
		const filePath = fileURI.fsPath;

		function testParseOutput(output: string, expected: { file: string; line: number; msg: string }[]) {
			const id = GoTest.id(fileURI, 'test', 'TestXXX');
			const ti = { id, uri: fileURI, range: new Range(1, 0, 100, 0) } as TestItem;
			const testMsgs = testExplorer.runner.parseOutput(ti, [output]);
			const got = testMsgs.map((m) => {
				return {
					file: m.location?.uri.fsPath,
					line: m.location?.range.start.line,
					msg: m.message
				};
			});
			assert.strictEqual(JSON.stringify(got), JSON.stringify(expected));
		}
		test('no line info ', () => testParseOutput(' foo \n', []));
		test('file path without preceding space', () => testParseOutput('file.go:7: foo\n', [])); // valid test message starts with a space.
		test('valid test message format', () =>
			testParseOutput('  file.go:7: foo\n', [{ file: filePath, line: 6, msg: 'foo\n' }]));
		test('message without ending newline', () =>
			testParseOutput(
				'  file.go:7: foo ', // valid test message contains a new line.
				[]
			));
		test('user print message before test message', () =>
			testParseOutput('random print file.go:8: foo\n', [{ file: filePath, line: 7, msg: 'foo\n' }]));
		test('multiple file locs in one line', () =>
			testParseOutput('file.go:1: line1 . file.go:2: line2 \n', [{ file: filePath, line: 1, msg: 'line2 \n' }]));
	});

	suite('Profile', () => {
		const sandbox = sinon.createSandbox();
		const ctx = MockExtensionContext.new();
		const env = new Env();

		let stub: sinon.SinonStub<[testUtils.TestConfig], Promise<boolean>>;

		suiteSetup(async () => {
			const profileDir = path.join(fixtureDir, 'codelens', 'testnames');
			const uri = Uri.file(path.join(profileDir, 'testnames_test.go'));
			await env.startGopls(uri.fsPath, undefined, profileDir);
			testExplorer = GoTestExplorer.new(ctx, env.goCtx);
			ctx.subscriptions.push(testExplorer);

			await forceDidOpenTextDocument(workspace, testExplorer, uri);

			stub = sandbox.stub(testUtils, 'goTest');
			stub.callsFake((cfg) => {
				const send = cfg.goTestOutputConsumer;
				if (send && cfg.functions instanceof Array) {
					cfg.functions.forEach((name) => send({ Test: name, Action: 'run' }));
					cfg.functions.forEach((name) => send({ Test: name, Action: 'pass' }));
				}
				return Promise.resolve(true);
			});
		});

		suiteTeardown(async () => {
			await env.teardown();
			ctx.teardown();
			sandbox.restore();
		});

		setup(() => {
			// Clear counts and history between each test.
			stub.resetHistory();
		});

		teardown(async function () {
			// Note: this shouldn't use () => {...}. Arrow functions do not have 'this'.
			// I don't know why but this.currentTest.state does not have the expected value when
			// used with teardown.
			env.flushTrace(this.currentTest?.state === 'failed');
		});

		test('creates a profile', async () => {
			const test = Array.from(testExplorer.resolver.allItems).filter((x) => GoTest.parseId(x.id).name)[0];
			assert(test, 'No tests found');

			assert(
				await testExplorer.runner.run(
					{
						include: [test],
						exclude: undefined,
						profile: undefined,
						preserveFocus: false
					},
					undefined,
					{ kind: 'cpu' }
				),
				'Failed to execute `go test`'
			);
			assert.strictEqual(stub.callCount, 1, 'expected one call to goTest');
			assert(stub.lastCall.args[0].flags.some((x) => x === '--cpuprofile'));
			assert(testExplorer.profiler.hasProfileFor(test.id), 'Did not create profile for test');
		});

		test('tests are run together when not profiling', async () => {
			const tests = Array.from(testExplorer.resolver.allItems).filter((x) => GoTest.parseId(x.id).name);
			assert(tests, 'No tests found');

			assert(
				await testExplorer.runner.run({
					include: tests,
					exclude: undefined,
					profile: undefined,
					preserveFocus: false
				}),
				'Failed to execute `go test`'
			);
			assert.strictEqual(stub.callCount, 1, 'expected one call to goTest');
			assert.deepStrictEqual(
				stub.lastCall.args[0].functions,
				tests.map((x) => GoTest.parseId(x.id).name)
			);
		});

		test('tests are run individually when profiling', async () => {
			const tests = Array.from(testExplorer.resolver.allItems).filter((x) => GoTest.parseId(x.id).name);
			assert(tests, 'No tests found');

			console.log(`running ${tests.length} tests`);

			assert(
				await testExplorer.runner.run(
					{
						include: tests,
						exclude: undefined,
						profile: undefined,
						preserveFocus: false
					},
					undefined,
					{ kind: 'cpu' }
				),
				'Failed to execute `go test`'
			);
			console.log('verify we got expected calls');
			const calls = await stub.getCalls();
			assert.strictEqual(calls.length, tests.length, 'expected one call to goTest per test');
			calls.forEach((call, i) =>
				assert.deepStrictEqual(call.args[0].functions, [GoTest.parseId(tests[i].id).name])
			);
			tests.forEach((test) =>
				assert(testExplorer.profiler.hasProfileFor(test.id), `Missing profile for ${test.id}`)
			);
		});
	});

	suite('Subtest', function () {
		// This test is slow, especially on Windows.
		// WARNING: each call to testExplorer.runner.run triggers one or more
		// `go test` command runs (testUtils.goTest is spied, not mocked or replaced).
		// Each `go test` command invocation can take seconds on slow machines.
		// As we add more cases, the timeout should be increased accordingly.
		this.timeout(20000); // I don't know why but timeout chained after `suite` didn't work.

		const sandbox = sinon.createSandbox();
		const subTestDir = path.join(fixtureDir, 'subTest');
		const ctx = MockExtensionContext.new();
		const env = new Env();

		let uri: Uri;
		let spy: sinon.SinonSpy<[testUtils.TestConfig], Promise<boolean>>;

		suiteSetup(async () => {
			uri = Uri.file(path.join(subTestDir, 'sub_test.go'));
			// TODO(hyangah): I don't know why, but gopls seems to pick up ./test/testdata/codelens as
			// the workspace directory when we don't explicitly set the workspace directory
			// (so initialize request doesn't include workspace dir info). The codelens directory was
			// used in the previous test suite. Figure out why.
			await env.startGopls(uri.fsPath, undefined, subTestDir);
			testExplorer = GoTestExplorer.new(ctx, env.goCtx);
			ctx.subscriptions.push(testExplorer);
			await forceDidOpenTextDocument(workspace, testExplorer, uri);

			spy = sandbox.spy(testUtils, 'goTest');
		});

		suiteTeardown(async () => {
			await env.teardown();
			ctx.teardown();
			sandbox.restore();
		});

		teardown(async function () {
			// Note: this shouldn't use () => {...}. Arrow functions do not have 'this'.
			// I don't know why but this.currentTest.state does not have the expected value when
			// used with teardown.
			env.flushTrace(this.currentTest?.state === 'failed');
		});

		test('discover and run', async () => {
			// Locate TestMain and TestOther
			const tests = testExplorer.resolver.find(uri).filter((x) => GoTest.parseId(x.id).kind === 'test');
			tests.sort((a, b) => a.label.localeCompare(b.label));
			assert.deepStrictEqual(
				tests.map((x) => x.label),
				['TestMain', 'TestOther']
			);
			const [tMain, tOther] = tests;

			// Run TestMain
			console.log('Run TestMain');
			assert(
				await testExplorer.runner.run({
					include: [tMain],
					exclude: undefined,
					profile: undefined,
					preserveFocus: false
				}),
				'Failed to execute `go test`'
			);
			assert.strictEqual(spy.callCount, 1, 'expected one call to goTest');

			// Verify TestMain was run
			console.log('Verify TestMain was run');
			let call = spy.lastCall.args[0];
			assert.strictEqual(call.dir, subTestDir);
			assert.deepStrictEqual(call.functions, ['TestMain']);
			spy.resetHistory();

			// Locate subtest
			console.log('Locate subtest');
			const tSub = tMain.children.get(GoTest.id(uri, 'test', 'TestMain/Sub|Test'));
			assert(tSub, 'Subtest was not created');

			console.log('Locate subtests with conflicting names');
			const tSub2 = tMain.children.get(GoTest.id(uri, 'test', 'TestMain/Sub|Test#01'));
			assert(tSub2, 'Subtest #01 was not created');
			const tSub3 = tMain.children.get(GoTest.id(uri, 'test', 'TestMain/Sub|Test#01#01'));
			assert(tSub3, 'Subtest #01#01 was not created');

			const tSub4 = tMain.children.get(GoTest.id(uri, 'test', 'TestMain/1_+_1'));
			assert(tSub4, 'Subtest 1_+_1 was not created');

			const tSub5 = tSub4.children.get(GoTest.id(uri, 'test', 'TestMain/1_+_1/Nested'));
			assert(tSub5, 'Subtest 1_+_1/Nested was not created');

			// Run subtest by itself
			console.log('Run subtest by itself');
			assert(
				await testExplorer.runner.run({
					include: [tSub],
					exclude: undefined,
					profile: undefined,
					preserveFocus: false
				}),
				'Failed to execute `go test`'
			);
			assert.strictEqual(spy.callCount, 1, 'expected one call to goTest');

			// Verify TestMain/Sub was run
			console.log('Verify TestMain/Sub was run');
			call = spy.lastCall.args[0];
			assert.strictEqual(call.dir, subTestDir);
			assert.deepStrictEqual(call.functions, ['TestMain/Sub\\|Test']); // | is escaped.
			spy.resetHistory();

			// Ensure the subtest hasn't been disposed
			console.log('Ensure the subtest has not been disposed');
			assert(tSub.parent, 'Subtest was disposed');

			// Attempt to run subtest and other test - should not work
			console.log('Attempt to run subtest and other test');
			assert(
				await testExplorer.runner.run({
					include: [tSub, tOther],
					exclude: undefined,
					profile: undefined,
					preserveFocus: false
				}),
				'Failed to execute `go test`'
			);
			assert.strictEqual(spy.callCount, 0, 'expected no calls to goTest');
		});
	});
});