// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT License.

import * as vscode from 'vscode';

import { getGlobalStorage } from '../common/persistentState';

import { getOSType, OSType } from '../common/utils/platform';

import { IDisposable } from '../common/utils/resourceLifecycle';

import { ActivationResult, ExtensionState } from '../components';

import { PythonEnvironments } from './api';

import { getPersistentCache } from './base/envsCache';

import { PythonEnvInfo } from './base/info';

import { ILocator } from './base/locator';

import { CachingLocator } from './base/locators/composite/cachingLocator';

import { PythonEnvsReducer } from './base/locators/composite/environmentsReducer';

import { PythonEnvsResolver } from './base/locators/composite/environmentsResolver';

import { WorkspaceVirtualEnvironmentLocator } from './base/locators/lowLevel/workspaceVirtualEnvLocator';

import { getEnvs } from './base/locatorUtils';

import { initializeExternalDependencies as initializeLegacyExternalDependencies } from './common/externalDependencies';

import { ExtensionLocators, WatchRootsArgs, WorkspaceLocators } from './discovery/locators';

import { CustomVirtualEnvironmentLocator } from './discovery/locators/services/customVirtualEnvLocator';

import { GlobalVirtualEnvironmentLocator } from './discovery/locators/services/globalVirtualEnvronmentLocator';

import { PosixKnownPathsLocator } from './discovery/locators/services/posixKnownPathsLocator';

import { PyenvLocator } from './discovery/locators/services/pyenvLocator';

import { WindowsRegistryLocator } from './discovery/locators/services/windowsRegistryLocator';

import { WindowsStoreLocator } from './discovery/locators/services/windowsStoreLocator';

import { EnvironmentInfoService } from './info/environmentInfoService';

import { registerLegacyDiscoveryForIOC, registerNewDiscoveryForIOC } from './legacyIOC';

import { EnvironmentsSecurity, IEnvironmentsSecurity } from './security';

/**

* Set up the Python environments component (during extension activation).'

*/

export function initialize(ext: ExtensionState): PythonEnvironments {

const environmentsSecurity = new EnvironmentsSecurity();

const api = new PythonEnvironments(

() => createLocators(ext, environmentsSecurity),

// Other sub-commonents (e.g. config, "current" env) will go here.

);

ext.disposables.push(api);

// Any other initialization goes here.

// Deal with legacy IOC.

registerLegacyDiscoveryForIOC(ext.legacyIOC.serviceManager);

initializeLegacyExternalDependencies(ext.legacyIOC.serviceContainer);

registerNewDiscoveryForIOC(ext.legacyIOC.serviceManager, api, environmentsSecurity, ext.disposables);

return api;

}

/**

* Make use of the component (e.g. register with VS Code).

*/

export async function activate(api: PythonEnvironments): Promise<ActivationResult> {

// Force an initial background refresh of the environments.

getEnvs(api.iterEnvs()).ignoreErrors();

// Registration with VS Code will go here.

return {

fullyReady: Promise.resolve(),

};

}

/**

* Get the set of locators to use in the component.

*/

async function createLocators(ext: ExtensionState, environmentsSecurity: IEnvironmentsSecurity): Promise<ILocator> {

// Create the low-level locators.

let locators: ILocator = new ExtensionLocators(createNonWorkspaceLocators(ext), createWorkspaceLocator(ext));

// Create the env info service used by ResolvingLocator and CachingLocator.

const envInfoService = new EnvironmentInfoService();

ext.disposables.push(envInfoService);

// Build the stack of composite locators.

locators = new PythonEnvsReducer(locators);

locators = new PythonEnvsResolver(locators, envInfoService, environmentsSecurity.isEnvSafe);

const caching = await createCachingLocator(ext, envInfoService, locators);

ext.disposables.push(caching);

locators = caching;

return locators;

}

function createNonWorkspaceLocators(ext: ExtensionState): ILocator[] {

let locators: (ILocator & Partial<IDisposable>)[];

if (getOSType() === OSType.Windows) {

// Windows specific locators go here

locators = [new WindowsRegistryLocator(), new WindowsStoreLocator()];

} else {

// Linux/Mac locators go here

locators = [new PosixKnownPathsLocator()];

}

locators.push(new GlobalVirtualEnvironmentLocator(), new PyenvLocator(), new CustomVirtualEnvironmentLocator());

const disposables = locators.filter((d) => d.dispose !== undefined) as IDisposable[];

ext.disposables.push(...disposables);

return locators;

}

function watchRoots(args: WatchRootsArgs): IDisposable {

const { initRoot, addRoot, removeRoot } = args;

const folders = vscode.workspace.workspaceFolders;

if (folders) {

folders.map((f) => f.uri).forEach(initRoot);

}

return vscode.workspace.onDidChangeWorkspaceFolders((event) => {

for (const root of event.removed) {

removeRoot(root.uri);

}

for (const root of event.added) {

addRoot(root.uri);

}

});

}

function createWorkspaceLocator(ext: ExtensionState): WorkspaceLocators {

const locators = new WorkspaceLocators(watchRoots, [

(root: vscode.Uri) => [new WorkspaceVirtualEnvironmentLocator(root.fsPath)],

// Add an ILocator factory func here for each kind of workspace-rooted locator.

]);

ext.disposables.push(locators);

return locators;

}

async function createCachingLocator(

ext: ExtensionState,

envInfoService: EnvironmentInfoService,

locators: ILocator,

): Promise<CachingLocator> {

const storage = getGlobalStorage<PythonEnvInfo[]>(ext.context, 'PYTHON_ENV_INFO_CACHE');

const cache = await getPersistentCache(

{

load: async () => storage.get(),

store: async (e) => storage.set(e),

},

(env: PythonEnvInfo) => envInfoService.isInfoProvided(env.executable.filename), // "isComplete"

);

return new CachingLocator(cache, locators);

}