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

'use strict';

import nls = require('vs/nls');
import { TPromise } from 'vs/base/common/winjs.base';
import errors = require('vs/base/common/errors');
import types = require('vs/base/common/types');
import arrays = require('vs/base/common/arrays');
import Severity from 'vs/base/common/severity';
import { Separator } from 'vs/base/browser/ui/actionbar/actionbar';
import { IAction, Action } from 'vs/base/common/actions';
import { IPartService } from 'vs/workbench/services/part/common/partService';
import { IMessageService } from 'vs/platform/message/common/message';
import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
import { ITelemetryService } from 'vs/platform/telemetry/common/telemetry';
import { IContextMenuService } from 'vs/platform/contextview/browser/contextView';
import { ICommandService } from 'vs/platform/commands/common/commands';
import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
import { IWorkspaceContextService } from 'vs/platform/workspace/common/workspace';
import { IWindowService } from 'vs/workbench/services/window/electron-browser/windowService';
import { AutoSaveConfiguration } from 'vs/platform/files/common/files';
import { IConfigurationEditingService, ConfigurationTarget } from 'vs/workbench/services/configuration/common/configurationEditing';
import { IWorkspaceConfigurationService } from 'vs/workbench/services/configuration/common/configuration';
import { ElectronWindow } from 'vs/workbench/electron-browser/window';
import * as browser from 'vs/base/browser/browser';
import { DiffEditorInput, toDiffLabel } from 'vs/workbench/common/editor/diffEditorInput';
import { Position } from 'vs/platform/editor/common/editor';
import { EditorInput } from 'vs/workbench/common/editor';
import { IPath, IOpenFileRequest, IWindowConfiguration } from 'vs/workbench/electron-browser/common';
import { IResourceInput } from 'vs/platform/editor/common/editor';
import { IWorkbenchEditorService } from 'vs/workbench/services/editor/common/editorService';
import { IUntitledEditorService } from 'vs/workbench/services/untitled/common/untitledEditorService';
import URI from 'vs/base/common/uri';

import { ipcRenderer as ipc, webFrame, remote } from 'electron';

const currentWindow = remote.getCurrentWindow();

const TextInputActions: IAction[] = [
	new Action('undo', nls.localize('undo', "Undo"), null, true, () => document.execCommand('undo') && TPromise.as(true)),
	new Action('redo', nls.localize('redo', "Redo"), null, true, () => document.execCommand('redo') && TPromise.as(true)),
	new Separator(),
	new Action('editor.action.clipboardCutAction', nls.localize('cut', "Cut"), null, true, () => document.execCommand('cut') && TPromise.as(true)),
	new Action('editor.action.clipboardCopyAction', nls.localize('copy', "Copy"), null, true, () => document.execCommand('copy') && TPromise.as(true)),
	new Action('editor.action.clipboardPasteAction', nls.localize('paste', "Paste"), null, true, () => document.execCommand('paste') && TPromise.as(true)),
	new Separator(),
	new Action('editor.action.selectAll', nls.localize('selectAll', "Select All"), null, true, () => document.execCommand('selectAll') && TPromise.as(true))
];

export class ElectronIntegration {

	private static AUTO_SAVE_SETTING = 'files.autoSave';

	constructor(
		@IInstantiationService private instantiationService: IInstantiationService,
		@IWindowService private windowService: IWindowService,
		@IPartService private partService: IPartService,
		@IWorkspaceContextService private contextService: IWorkspaceContextService,
		@ITelemetryService private telemetryService: ITelemetryService,
		@IWorkspaceConfigurationService private configurationService: IWorkspaceConfigurationService,
		@ICommandService private commandService: ICommandService,
		@IConfigurationEditingService private configurationEditingService: IConfigurationEditingService,
		@IKeybindingService private keybindingService: IKeybindingService,
		@IMessageService private messageService: IMessageService,
		@IContextMenuService private contextMenuService: IContextMenuService,
		@IWorkbenchEditorService private editorService: IWorkbenchEditorService,
		@IUntitledEditorService private untitledEditorService: IUntitledEditorService
	) {
	}

	public integrate(shellContainer: HTMLElement): void {

		// Register the active window
		const activeWindow = this.instantiationService.createInstance(ElectronWindow, currentWindow, shellContainer);
		this.windowService.registerWindow(activeWindow);

		// Support runAction event
		ipc.on('vscode:runAction', (event, actionId: string) => {
			this.commandService.executeCommand(actionId, { from: 'menu' }).done(undefined, err => this.messageService.show(Severity.Error, err));
		});

		// Support resolve keybindings event
		ipc.on('vscode:resolveKeybindings', (event, rawActionIds: string) => {
			let actionIds: string[] = [];
			try {
				actionIds = JSON.parse(rawActionIds);
			} catch (error) {
				// should not happen
			}

			// Resolve keys using the keybinding service and send back to browser process
			this.resolveKeybindings(actionIds).done((keybindings) => {
				if (keybindings.length) {
					ipc.send('vscode:keybindingsResolved', JSON.stringify(keybindings));
				}
			}, () => errors.onUnexpectedError);
		});

		ipc.on('vscode:telemetry', (event, { eventName, data }) => {
			this.telemetryService.publicLog(eventName, data);
		});

		ipc.on('vscode:reportError', (event, error) => {
			if (error) {
				const errorParsed = JSON.parse(error);
				errorParsed.mainProcess = true;
				errors.onUnexpectedError(errorParsed);
			}
		});

		// Support openFiles event for existing and new files
		ipc.on('vscode:openFiles', (event, request: IOpenFileRequest) => this.onOpenFiles(request));

		// Emit event when vscode has loaded
		this.partService.joinCreation().then(() => {
			ipc.send('vscode:workbenchLoaded', this.windowService.getWindowId());
		});

		// Message support
		ipc.on('vscode:showInfoMessage', (event, message: string) => {
			this.messageService.show(Severity.Info, message);
		});

		// Support toggling auto save
		ipc.on('vscode.toggleAutoSave', (event) => {
			this.toggleAutoSave();
		});

		// Fullscreen Events
		ipc.on('vscode:enterFullScreen', (event) => {
			this.partService.joinCreation().then(() => {
				this.partService.addClass('fullscreen');
			});
		});

		ipc.on('vscode:leaveFullScreen', (event) => {
			this.partService.joinCreation().then(() => {
				this.partService.removeClass('fullscreen');
			});
		});

		// Ensure others can listen to zoom level changes
		browser.setZoomLevel(webFrame.getZoomLevel());

		// Configuration changes
		let previousConfiguredZoomLevel: number;
		this.configurationService.onDidUpdateConfiguration(e => {
			const windowConfig: IWindowConfiguration = e.config;

			let newZoomLevel = 0;
			if (windowConfig.window && typeof windowConfig.window.zoomLevel === 'number') {
				newZoomLevel = windowConfig.window.zoomLevel;

				// Leave early if the configured zoom level did not change (https://github.com/Microsoft/vscode/issues/1536)
				if (previousConfiguredZoomLevel === newZoomLevel) {
					return;
				}

				previousConfiguredZoomLevel = newZoomLevel;
			}

			if (webFrame.getZoomLevel() !== newZoomLevel) {
				webFrame.setZoomLevel(newZoomLevel);
				browser.setZoomLevel(webFrame.getZoomLevel()); // Ensure others can listen to zoom level changes
			}
		});

		// Context menu support in input/textarea
		window.document.addEventListener('contextmenu', (e) => {
			if (e.target instanceof HTMLElement) {
				const target = <HTMLElement>e.target;
				if (target.nodeName && (target.nodeName.toLowerCase() === 'input' || target.nodeName.toLowerCase() === 'textarea')) {
					e.preventDefault();
					e.stopPropagation();

					this.contextMenuService.showContextMenu({
						getAnchor: () => target,
						getActions: () => TPromise.as(TextInputActions),
						getKeyBinding: (action) => {
							const opts = this.keybindingService.lookupKeybindings(action.id);
							if (opts.length > 0) {
								return opts[0]; // only take the first one
							}

							return null;
						}
					});
				}
			}
		});
	}

	private resolveKeybindings(actionIds: string[]): TPromise<{ id: string; binding: number; }[]> {
		return this.partService.joinCreation().then(() => {
			return arrays.coalesce(actionIds.map((id) => {
				const bindings = this.keybindingService.lookupKeybindings(id);

				// return the first binding that can be represented by electron
				for (let i = 0; i < bindings.length; i++) {
					const binding = bindings[i];
					const electronAccelerator = this.keybindingService.getElectronAcceleratorFor(binding);
					if (electronAccelerator) {
						return {
							id: id,
							binding: binding.value
						};
					}
				}

				return null;
			}));
		});
	}

	private onOpenFiles(request: IOpenFileRequest): void {
		let inputs: IResourceInput[] = [];
		let diffMode = (request.filesToDiff.length === 2);

		if (!diffMode && request.filesToOpen) {
			inputs.push(...this.toInputs(request.filesToOpen, false));
		}

		if (!diffMode && request.filesToCreate) {
			inputs.push(...this.toInputs(request.filesToCreate, true));
		}

		if (diffMode) {
			inputs.push(...this.toInputs(request.filesToDiff, false));
		}

		if (inputs.length) {
			this.openResources(inputs, diffMode).done(null, errors.onUnexpectedError);
		}
	}

	private openResources(resources: IResourceInput[], diffMode: boolean): TPromise<any> {
		return this.partService.joinCreation().then(() => {

			// In diffMode we open 2 resources as diff
			if (diffMode) {
				return TPromise.join(resources.map(f => this.editorService.createInput(f))).then((inputs: EditorInput[]) => {
					return this.editorService.openEditor(new DiffEditorInput(toDiffLabel(resources[0].resource, resources[1].resource, this.contextService), null, inputs[0], inputs[1]));
				});
			}

			// For one file, just put it into the current active editor
			if (resources.length === 1) {
				return this.editorService.openEditor(resources[0]);
			}

			// Otherwise open all
			const activeEditor = this.editorService.getActiveEditor();
			return this.editorService.openEditors(resources.map((r, index) => {
				return {
					input: r,
					position: activeEditor ? activeEditor.position : Position.ONE
				};
			}));
		});
	}

	private toInputs(paths: IPath[], isNew: boolean): IResourceInput[] {
		return paths.map(p => {
			let input = <IResourceInput>{
				resource: isNew ? this.untitledEditorService.createOrGet(URI.file(p.filePath)).getResource() : URI.file(p.filePath),
				options: {
					pinned: true
				}
			};

			if (!isNew && p.lineNumber) {
				input.options.selection = {
					startLineNumber: p.lineNumber,
					startColumn: p.columnNumber
				};
			}

			return input;
		});
	}

	private toggleAutoSave(): void {
		const setting = this.configurationService.lookup(ElectronIntegration.AUTO_SAVE_SETTING);
		let userAutoSaveConfig = setting.user;
		if (types.isUndefinedOrNull(userAutoSaveConfig)) {
			userAutoSaveConfig = setting.default; // use default if setting not defined
		}

		let newAutoSaveValue: string;
		if ([AutoSaveConfiguration.AFTER_DELAY, AutoSaveConfiguration.ON_FOCUS_CHANGE, AutoSaveConfiguration.ON_WINDOW_CHANGE].some(s => s === userAutoSaveConfig)) {
			newAutoSaveValue = AutoSaveConfiguration.OFF;
		} else {
			newAutoSaveValue = AutoSaveConfiguration.AFTER_DELAY;
		}

		this.configurationEditingService.writeConfiguration(ConfigurationTarget.USER, { key: ElectronIntegration.AUTO_SAVE_SETTING, value: newAutoSaveValue }).done(null, (error) => this.messageService.show(Severity.Error, error));
	}
}