import assert = require('assert');
import fs = require('fs');
import os = require('os');
import path = require('path');
import sinon = require('sinon');
import vscode = require('vscode');
import parse = require('yargs-parser');
import { getGoConfig } from '../../src/config';
import { GoDebugConfigurationProvider } from '../../src/goDebugConfiguration';
import goEnv = require('../../src/goEnv');
import { updateGoVarsFromConfig } from '../../src/goInstallTools';
import { rmdirRecursive } from '../../src/util';

suite('Debug Environment Variable Merge Test', () => {
	const debugConfigProvider = new GoDebugConfigurationProvider();

	suiteSetup(async () => {
		await updateGoVarsFromConfig();

		// Set up the test fixtures.
		const fixtureSourcePath = path.join(__dirname, '..', '..', '..', 'test', 'testdata');
		const filePath = path.join(fixtureSourcePath, 'baseTest', 'test.go');
		await vscode.workspace.openTextDocument(vscode.Uri.file(filePath));
	});

	suiteTeardown(() => {
		vscode.commands.executeCommand('workbench.action.closeActiveEditor');
	});

	let sandbox: sinon.SinonSandbox;
	let tmpDir = '';
	const toolExecutionEnv: NodeJS.Dict<string> = {};
	setup(() => {
		tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'godebugconfig_test'));
		sandbox = sinon.createSandbox();

	});

	teardown(() => {
		sandbox.restore();
		rmdirRecursive(tmpDir);
	});

	interface Input {
		env?: { [key: string]: any };
		envFile?: string | string[];
		toolsEnv?: { [key: string]: any };
	}

	function runTest(input: Input, expected: { [key: string]: any }) {
		sandbox.stub(goEnv, 'toolExecutionEnvironment').returns(input.toolsEnv || {});
		const config = debugConfigProvider.resolveDebugConfigurationWithSubstitutedVariables(undefined, {
			type: 'go',
			name: 'Launch',
			request: 'launch',
			env: input.env,
			envFile: input.envFile,
		});

		const actual = config.env;
		assert.deepStrictEqual(actual, expected);
	}

	test('works with empty launchArgs', () => {
		runTest({}, {});
	});

	test('toolsEnvVars is propagated', () => {
		const toolsEnv = {
			GOPATH: '/gopath',
			GOOS: 'valueFromToolsEnv'
		};

		runTest({ toolsEnv }, {
			GOPATH: '/gopath',
			GOOS: 'valueFromToolsEnv'
		});
	});

	test('preserves settings from launchArgs.env', () => {
		const env = { GOPATH: 'valueFromEnv', GOOS: 'valueFromEnv2' };
		runTest({ env }, {
			GOPATH: 'valueFromEnv',
			GOOS: 'valueFromEnv2'
		});
	});

	test('preserves settings from launchArgs.envFile', () => {
		const envFile = path.join(tmpDir, 'env');
		fs.writeFileSync(envFile, 'GOPATH=valueFromEnvFile');
		runTest({ envFile }, { GOPATH: 'valueFromEnvFile' });
	});

	test('launchArgs.env overwrites launchArgs.envFile', () => {
		const env = { SOMEVAR1: 'valueFromEnv' };
		const envFile = path.join(tmpDir, 'env');
		fs.writeFileSync(envFile, [
			'SOMEVAR1=valueFromEnvFile1',
			'SOMEVAR2=valueFromEnvFile2'].join('\n'));

		runTest({ env, envFile }, {
			SOMEVAR1: 'valueFromEnv',
			SOMEVAR2: 'valueFromEnvFile2'
		});
	});

	test('launchArgs.env overwrites toolsEnvVar', () => {
		const toolsEnv = {
			GOPATH: '/gopath',
			SOMEVAR1: 'valueFromToolsEnvVar1',
			SOMEVAR2: 'valueFromToolsEnvVar2'
		};

		const env = { SOMEVAR1: 'valueFromEnv' };
		runTest({ env, toolsEnv }, {
			GOPATH: '/gopath',
			SOMEVAR1: 'valueFromEnv',
			SOMEVAR2: 'valueFromToolsEnvVar2'
		});
	});

	test('launchArgs.envFile overwrites toolsEnvVar', () => {
		const toolsEnv = {
			GOPATH: '/gopath',
			SOMEVAR1: 'valueFromToolsEnvVar1',
			SOMEVAR2: 'valueFromToolsEnvVar2'
		};
		const envFile = path.join(tmpDir, 'env');
		fs.writeFileSync(envFile, [
			'SOMEVAR2=valueFromEnvFile2'].join('\n'));

		runTest({ toolsEnv, envFile }, {
			GOPATH: '/gopath',
			SOMEVAR1: 'valueFromToolsEnvVar1',
			SOMEVAR2: 'valueFromEnvFile2'
		});
	});
});

suite('Debug Configuration Merge User Settings', () => {
	const debugConfigProvider = new GoDebugConfigurationProvider();
	const config = require('../../src/config');

	teardown(() => sinon.restore());

	suite(`merge 'go' config from settings.json`, () => {
		test('go flags config does not affect debug config', () => {
			// This tests that the testFlags and GOOS and GOARCH set
			// in settings.json do not affect the resolved debug configuration.
			// When this expected behavior changes, this test can be updated.

			// Run resolveDebugConfiguration with the default workspace settings.
			const cfg1 = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
			};

			const emptyResult = debugConfigProvider.resolveDebugConfiguration(undefined, cfg1);
			const goConfig = Object.create(getGoConfig(), {
				testFlags: {value: '-tags=myTagTest'},
				buildFlags: {value: '-tags=myTagBuild'},
				goroot: {value: '/path/to/goroot'},
				gopath: {value: '/path/to/gopath'}
			}) as vscode.WorkspaceConfiguration;

			// Adjust the workspace config.
			sinon.stub(config, 'getGoConfig').returns(goConfig);

			const cfg2 = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
			};

			const filledResult = debugConfigProvider.resolveDebugConfiguration(undefined, cfg2);

			assert.strictEqual(filledResult.name, emptyResult.name);
			assert.strictEqual(filledResult.type, emptyResult.type);
			assert.strictEqual(filledResult.mode, emptyResult.mode);
			assert.strictEqual(filledResult.request, emptyResult.request);
			assert.strictEqual(filledResult.program, emptyResult.program);
			assert.strictEqual(filledResult.dlvToolPath, emptyResult.dlvToolPath);
			assert.strictEqual(filledResult.apiVersion, emptyResult.apiVersion);
			assert.strictEqual(filledResult.showGlobalVariables, emptyResult.showGlobalVariables);
		});

		test('delve config in settings.json is added to debug config', () => {
			// This tests that the testFlags and GOOS and GOARCH set
			// in settings.json do not affect the resolved debug configuration.
			// When this expected behavior changes, this test can be updated.

			// Run resolveDebugConfiguration with the default workspace settings.
			const goConfig = Object.create(getGoConfig(), {
				delveConfig: { value: {
						dlvLoadConfig: {
							followPointers: false,
							maxVariableRecurse: 3,
							maxStringLen: 32,
							maxArrayValues: 32,
							maxStructFields: 5
						},
						apiVersion: 1,
						showGlobalVariables: true
					}
				}
			}) as vscode.WorkspaceConfiguration;
			sinon.stub(config, 'getGoConfig').returns(goConfig);

			const cfg = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
			};

			const result = debugConfigProvider.resolveDebugConfiguration(undefined, cfg);
			assert.strictEqual(result.apiVersion, 1);
			assert.strictEqual(result.showGlobalVariables, true);
			const dlvLoadConfig = result.dlvLoadConfig;
			assert.strictEqual(dlvLoadConfig.followPointers, false);
			assert.strictEqual(dlvLoadConfig.maxVariableRecurse, 3);
			assert.strictEqual(dlvLoadConfig.maxStringLen, 32);
			assert.strictEqual(dlvLoadConfig.maxArrayValues, 32);
			assert.strictEqual(dlvLoadConfig.maxStructFields, 5);
		});

		test('delve config in settings.json is overriden by launch.json', () => {
			// This tests that the testFlags and GOOS and GOARCH set
			// in settings.json do not affect the resolved debug configuration.
			// When this expected behavior changes, this test can be updated.

			// Run resolveDebugConfiguration with the default workspace settings.
			const goConfig = Object.create(getGoConfig(), {
				delveConfig: { value: {
						dlvLoadConfig: {
							followPointers: false,
							maxVariableRecurse: 3,
							maxStringLen: 32,
							maxArrayValues: 32,
							maxStructFields: 5
						},
						apiVersion: 1,
						showGlobalVariables: true
					}
				}
			}) as vscode.WorkspaceConfiguration;
			sinon.stub(config, 'getGoConfig').returns(goConfig);

			const cfg = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
				apiVersion: 2,
				showGlobalVariables: false,
				dlvLoadConfig: {
					followPointers: true,
					maxVariableRecurse: 6,
					maxStringLen: 128,
					maxArrayValues: 128,
					maxStructFields: -1
				},
			};

			const result = debugConfigProvider.resolveDebugConfiguration(undefined, cfg);
			assert.strictEqual(result.apiVersion, 2);
			assert.strictEqual(result.showGlobalVariables, false);
			const dlvLoadConfig = result.dlvLoadConfig;
			assert.strictEqual(dlvLoadConfig.followPointers, true);
			assert.strictEqual(dlvLoadConfig.maxVariableRecurse, 6);
			assert.strictEqual(dlvLoadConfig.maxStringLen, 128);
			assert.strictEqual(dlvLoadConfig.maxArrayValues, 128);
			assert.strictEqual(dlvLoadConfig.maxStructFields, -1);
		});
	});
});

suite('Debug Configuration Modify User Config', () => {
	const debugConfigProvider = new GoDebugConfigurationProvider();

	function checkBuildFlags(input: string, expected: { [key: string]: any }) {
		// Parse the string result.
		const actual = parse(input, {configuration: {'short-option-groups': false}} );

		// Delete the empty entry that is created by parse.
		delete actual['_'];

		// Compare the two maps.
		assert.strictEqual(actual.size, expected.size);

		const expectedKeys = [];
		for (const key in expected) {
			if (expected.hasOwnProperty(key)) {
				expectedKeys.push(key);
			}
		}
		expectedKeys.sort();

		const actualKeys = [];
		for (const key in actual) {
			if (actual.hasOwnProperty(key)) {
				actualKeys.push(key);
			}
		}
		actualKeys.sort();

		for (let i = 0; i < expectedKeys.length; i ++) {
			assert.strictEqual(actualKeys[i], expectedKeys[i]);
			assert.strictEqual(actual[actualKeys[i]], expected[expectedKeys[i]]);
		}
	}

	suite('remove gcflags', () => {
		test('remove user set --gcflags in buildFlags', () => {
			const config = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
				env: {},
				buildFlags: '--gcflags=all=-l'
			};

			debugConfigProvider.resolveDebugConfiguration(undefined, config);

			checkBuildFlags(config.buildFlags, {});
		});

		test('remove user set -gcflags in buildFlags', () => {
			const config = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
				env: {},
				buildFlags: `-gcflags all=-l`
			};

			debugConfigProvider.resolveDebugConfiguration(undefined, config);

			checkBuildFlags(config.buildFlags, {});
		});

		test('remove user set --gcflags while preserving other build flags in buildFlags', () => {
			const config = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
				env: {},
				buildFlags: '-race --gcflags=all=-l --mod=mod'
			};

			debugConfigProvider.resolveDebugConfiguration(undefined, config);

			checkBuildFlags(config.buildFlags, {race: true, mod: 'mod'});
		});

		test('preserve empty buildFlags', () => {
			const config = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
				env: {},
				buildFlags: ''
			};

			debugConfigProvider.resolveDebugConfiguration(undefined, config);

			checkBuildFlags(config.buildFlags, {});
		});

		test('preserve buildFlags', () => {
			const config = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
				env: {},
				buildFlags: '-race --mod=mod'
			};

			debugConfigProvider.resolveDebugConfiguration(undefined, config);

			checkBuildFlags(config.buildFlags, {race: true, mod: 'mod'});
		});

		test('remove user set --gcflags in GOFLAGS', () => {
			const config = {
				name: 'Launch',
				type: 'go',
				request: 'launch',
				mode: 'auto',
				program: '${fileDirname}',
				env: {GOFLAGS: '-race --gcflags=-l --mod=mod'},
			};

			debugConfigProvider.resolveDebugConfiguration(undefined, config);

			checkBuildFlags(config.env.GOFLAGS, {race: true, mod: 'mod'});
		});
	});
});