/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the Source EULA. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { IExtensionTipsService, IExecutableBasedExtensionTip, IExtensionManagementService, ILocalExtension } from 'vs/platform/extensionManagement/common/extensionManagement';
import { ITelemetryService } from 'vs/platform/telemetry/common/telemetry';
import { ExtensionRecommendations, ExtensionRecommendation } from 'vs/workbench/contrib/extensions/browser/extensionRecommendations';
import { timeout } from 'vs/base/common/async';
import { localize } from 'vs/nls';
import { IStringDictionary } from 'vs/base/common/collections';
import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
import { INotificationService } from 'vs/platform/notification/common/notification';
import { basename } from 'vs/base/common/path';
import { ExtensionRecommendationReason } from 'vs/workbench/services/extensionManagement/common/extensionManagement';
import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
import { IStorageService } from 'vs/platform/storage/common/storage';
import { IStorageKeysSyncRegistryService } from 'vs/platform/userDataSync/common/storageKeys';

type ExeExtensionRecommendationsClassification = {
	extensionId: { classification: 'PublicNonPersonalData', purpose: 'FeatureInsight' };
	exeName: { classification: 'PublicNonPersonalData', purpose: 'FeatureInsight' };
};

export class ExeBasedRecommendations extends ExtensionRecommendations {

	readonly _recommendations: ExtensionRecommendation[] = [];
	get recommendations(): ReadonlyArray<ExtensionRecommendation> { return this._recommendations; }

	constructor(
		isExtensionAllowedToBeRecommended: (extensionId: string) => boolean,
		@IExtensionTipsService private readonly extensionTipsService: IExtensionTipsService,
		@IExtensionManagementService private readonly extensionManagementService: IExtensionManagementService,
		@IInstantiationService instantiationService: IInstantiationService,
		@IConfigurationService configurationService: IConfigurationService,
		@INotificationService notificationService: INotificationService,
		@ITelemetryService telemetryService: ITelemetryService,
		@IStorageService storageService: IStorageService,
		@IStorageKeysSyncRegistryService storageKeysSyncRegistryService: IStorageKeysSyncRegistryService,
	) {
		super(isExtensionAllowedToBeRecommended, instantiationService, configurationService, notificationService, telemetryService, storageService, storageKeysSyncRegistryService);

		/*
			3s has come out to be the good number to fetch and prompt important exe based recommendations
			Also fetch important exe based recommendations for reporting telemetry
		*/
		timeout(3000).then(() => this.fetchAndPromptImportantExeBasedRecommendations());
	}

	protected async doActivate(): Promise<void> {
		const otherExectuableBasedTips = await this.extensionTipsService.getOtherExecutableBasedTips();
		otherExectuableBasedTips.forEach(tip => this._recommendations.push(this.toExtensionRecommendation(tip)));
	}

	private async fetchAndPromptImportantExeBasedRecommendations(): Promise<void> {
		const importantExeBasedRecommendations: IStringDictionary<IExecutableBasedExtensionTip> = {};
		const importantExectuableBasedTips = await this.extensionTipsService.getImportantExecutableBasedTips();
		importantExectuableBasedTips.forEach(tip => {
			this._recommendations.push(this.toExtensionRecommendation(tip));
			importantExeBasedRecommendations[tip.extensionId.toLowerCase()] = tip;
		});

		const local = await this.extensionManagementService.getInstalled();
		const { installed, uninstalled } = this.groupByInstalled(Object.keys(importantExeBasedRecommendations), local);

		/* Log installed and uninstalled exe based recommendations */
		for (const extensionId of installed) {
			const tip = importantExeBasedRecommendations[extensionId];
			this.telemetryService.publicLog2<{ exeName: string, extensionId: string }, ExeExtensionRecommendationsClassification>('exeExtensionRecommendations:alreadyInstalled', { extensionId, exeName: basename(tip.windowsPath!) });
		}
		for (const extensionId of uninstalled) {
			const tip = importantExeBasedRecommendations[extensionId];
			this.telemetryService.publicLog2<{ exeName: string, extensionId: string }, ExeExtensionRecommendationsClassification>('exeExtensionRecommendations:notInstalled', { extensionId, exeName: basename(tip.windowsPath!) });
		}

		this.promptImportantExeBasedRecommendations(uninstalled, importantExeBasedRecommendations);
	}

	private promptImportantExeBasedRecommendations(recommendations: string[], importantExeBasedRecommendations: IStringDictionary<IExecutableBasedExtensionTip>): void {
		if (this.hasToIgnoreRecommendationNotifications()) {
			return;
		}
		recommendations = this.filterIgnoredOrNotAllowed(recommendations);
		if (recommendations.length === 0) {
			return;
		}

		for (const extensionId of recommendations) {
			const tip = importantExeBasedRecommendations[extensionId];
			const message = tip.isExtensionPack ? localize('extensionPackRecommended', "The '{0}' extension pack is recommended as you have {1} installed on your system.", tip.extensionName!, tip.exeFriendlyName || basename(tip.windowsPath!))
				: localize('exeRecommended', "The '{0}' extension is recommended as you have {1} installed on your system.", tip.extensionName!, tip.exeFriendlyName || basename(tip.windowsPath!));
			this.promptImportantExtensionInstallNotification(extensionId, message);
		}
	}

	private groupByInstalled(recommendationsToSuggest: string[], local: ILocalExtension[]): { installed: string[], uninstalled: string[] } {
		const installed: string[] = [], uninstalled: string[] = [];
		const installedExtensionsIds = local.reduce((result, i) => { result.add(i.identifier.id.toLowerCase()); return result; }, new Set<string>());
		recommendationsToSuggest.forEach(id => {
			if (installedExtensionsIds.has(id.toLowerCase())) {
				installed.push(id);
			} else {
				uninstalled.push(id);
			}
		});
		return { installed, uninstalled };
	}

	private toExtensionRecommendation(tip: IExecutableBasedExtensionTip): ExtensionRecommendation {
		return {
			extensionId: tip.extensionId.toLowerCase(),
			source: 'executable',
			reason: {
				reasonId: ExtensionRecommendationReason.Executable,
				reasonText: localize('exeBasedRecommendation', "This extension is recommended because you have {0} installed.", tip.extensionName)
			}
		};
	}

}