/*---------------------------------------------------------------------------------------------
 *  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 platform = require('vs/base/common/platform');
import URI from 'vs/base/common/uri';
import errors = require('vs/base/common/errors');
import types = require('vs/base/common/types');
import { TPromise } from 'vs/base/common/winjs.base';
import { stat } from 'vs/base/node/pfs';
import arrays = require('vs/base/common/arrays');
import DOM = require('vs/base/browser/dom');
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 { extractResources } from 'vs/base/browser/dnd';
import { Builder, $ } from 'vs/base/browser/builder';
import { IPartService } from 'vs/workbench/services/part/common/partService';
import { AutoSaveConfiguration } from 'vs/platform/files/common/files';
import { toResource } from 'vs/workbench/common/editor';
import { IWorkbenchEditorService } from 'vs/workbench/services/editor/common/editorService';
import { IEditorGroupService } from 'vs/workbench/services/group/common/groupService';
import { IMessageService } from 'vs/platform/message/common/message';
import { IWorkspaceConfigurationService } from 'vs/workbench/services/configuration/common/configuration';
import { IWindowsService, IWindowService, IWindowSettings } from 'vs/platform/windows/common/windows';
import { IContextMenuService } from 'vs/platform/contextview/browser/contextView';
import { IWindowIPCService } from 'vs/workbench/services/window/electron-browser/windowService';
import { IUntitledEditorService } from 'vs/workbench/services/untitled/common/untitledEditorService';
import { IEnvironmentService } from 'vs/platform/environment/common/environment';
import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
import { IPath, IOpenFileRequest, IWindowConfiguration } from 'vs/workbench/electron-browser/common';
import { IConfigurationEditingService, ConfigurationTarget } from 'vs/workbench/services/configuration/common/configurationEditing';
import { ITitleService } from 'vs/workbench/services/title/common/titleService';
import { Registry } from 'vs/platform/platform';
import { IWorkbenchActionRegistry, Extensions } from 'vs/workbench/common/actionRegistry';
import { SyncActionDescriptor } from 'vs/platform/actions/common/actions';
import { IThemeService, VS_HC_THEME, VS_DARK_THEME } from 'vs/workbench/services/themes/common/themeService';
import * as browser from 'vs/base/browser/browser';
import { ReloadWindowAction, ToggleDevToolsAction, ShowStartupPerformance, OpenRecentAction } from 'vs/workbench/electron-browser/actions';
import { KeyMod, KeyCode } from 'vs/base/common/keyCodes';
import { ICommandService } from 'vs/platform/commands/common/commands';
import { IViewletService } from 'vs/workbench/services/viewlet/browser/viewlet';
import { Position, IResourceInput } from 'vs/platform/editor/common/editor';
import { IExtensionService } from 'vs/platform/extensions/common/extensions';

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

const dialog = remote.dialog;

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 ElectronWindow {

	private static AUTO_SAVE_SETTING = 'files.autoSave';

	private win: Electron.BrowserWindow;
	private windowId: number;

	constructor(
		win: Electron.BrowserWindow,
		shellContainer: HTMLElement,
		@IWindowIPCService private windowIPCService: IWindowIPCService,
		@IWorkbenchEditorService private editorService: IWorkbenchEditorService,
		@IEditorGroupService private editorGroupService: IEditorGroupService,
		@IPartService private partService: IPartService,
		@IWindowsService private windowsService: IWindowsService,
		@IWindowService private windowService: IWindowService,
		@IWorkspaceConfigurationService private configurationService: IWorkspaceConfigurationService,
		@ITitleService private titleService: ITitleService,
		@IThemeService private themeService: IThemeService,
		@IMessageService private messageService: IMessageService,
		@IConfigurationEditingService private configurationEditingService: IConfigurationEditingService,
		@ICommandService private commandService: ICommandService,
		@IExtensionService private extensionService: IExtensionService,
		@IViewletService private viewletService: IViewletService,
		@IContextMenuService private contextMenuService: IContextMenuService,
		@IKeybindingService private keybindingService: IKeybindingService,
		@IEnvironmentService private environmentService: IEnvironmentService,
		@IUntitledEditorService private untitledEditorService: IUntitledEditorService,
	) {
		this.win = win;
		this.windowId = win.id;

		this.registerListeners();
		this.setup();
	}

	private registerListeners(): void {

		// React to editor input changes (Mac only)
		if (platform.platform === platform.Platform.Mac) {
			this.editorGroupService.onEditorsChanged(() => {
				const file = toResource(this.editorService.getActiveEditorInput(), { supportSideBySide: true, filter: 'file' });

				this.titleService.setRepresentedFilename(file ? file.fsPath : '');
			});
		}

		let draggedExternalResources: URI[];
		let dropOverlay: Builder;

		function cleanUp(): void {
			draggedExternalResources = void 0;

			if (dropOverlay) {
				dropOverlay.destroy();
				dropOverlay = void 0;
			}
		}

		// Detect resources dropped into Code from outside
		window.document.body.addEventListener(DOM.EventType.DRAG_OVER, (e: DragEvent) => {
			DOM.EventHelper.stop(e);

			if (!draggedExternalResources) {
				draggedExternalResources = extractResources(e, true /* external only */).map(d => d.resource);

				// Find out if folders are dragged and show the appropiate feedback then
				this.includesFolder(draggedExternalResources).done(includesFolder => {
					if (includesFolder) {
						dropOverlay = $(window.document.getElementById(this.partService.getWorkbenchElementId()))
							.div({ id: 'monaco-workbench-drop-overlay' })
							.on(DOM.EventType.DROP, (e: DragEvent) => {
								DOM.EventHelper.stop(e, true);

								this.focus(); // make sure this window has focus so that the open call reaches the right window!
								this.windowsService.windowOpen(draggedExternalResources.map(r => r.fsPath));

								cleanUp();
							})
							.on([DOM.EventType.DRAG_LEAVE, DOM.EventType.DRAG_END], () => {
								cleanUp();
							}).once(DOM.EventType.MOUSE_OVER, () => {
								// Under some circumstances we have seen reports where the drop overlay is not being
								// cleaned up and as such the editor area remains under the overlay so that you cannot
								// type into the editor anymore. This seems related to using VMs and DND via host and
								// guest OS, though some users also saw it without VMs.
								// To protect against this issue we always destroy the overlay as soon as we detect a
								// mouse event over it. The delay is used to guarantee we are not interfering with the
								// actual DROP event that can also trigger a mouse over event.
								// See also: https://github.com/Microsoft/vscode/issues/10970
								setTimeout(() => {
									cleanUp();
								}, 300);
							});
					}
				});
			}
		});

		// Clear our map and overlay on any finish of DND outside the overlay
		[DOM.EventType.DROP, DOM.EventType.DRAG_END].forEach(event => {
			window.document.body.addEventListener(event, (e: DragEvent) => {
				if (!dropOverlay || e.target !== dropOverlay.getHTMLElement()) {
					cleanUp(); // only run cleanUp() if we are not over the overlay (because we are being called in capture phase)
				}
			}, true /* use capture because components within may preventDefault() when they accept the drop */);
		});

		// prevent opening a real URL inside the shell
		window.document.body.addEventListener(DOM.EventType.DROP, (e: DragEvent) => {
			DOM.EventHelper.stop(e);
		});

		// Handle window.open() calls
		const $this = this;
		(<any>window).open = function (url: string, target: string, features: string, replace: boolean) {
			$this.windowsService.openExternal(url);

			return null;
		};
	}

	private setup(): void {

		// 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);
		});

		// Send over all extension viewlets when extensions are ready
		this.extensionService.onReady().then(() => {
			ipc.send('vscode:extensionViewlets', JSON.stringify(this.viewletService.getViewlets().filter(v => !!v.extensionId).map(v => { return { id: v.id, label: v.name }; })));
		});

		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.windowIPCService.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(() => {
				browser.setFullscreen(true);
			});
		});

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

		// High Contrast Events
		ipc.on('vscode:enterHighContrast', (event) => {
			const windowConfig = this.configurationService.getConfiguration<IWindowSettings>('window');
			if (windowConfig && windowConfig.autoDetectHighContrast) {
				this.partService.joinCreation().then(() => {
					this.themeService.setColorTheme(VS_HC_THEME, false);
				});
			}
		});

		ipc.on('vscode:leaveHighContrast', (event) => {
			const windowConfig = this.configurationService.getConfiguration<IWindowSettings>('window');
			if (windowConfig && windowConfig.autoDetectHighContrast) {
				this.partService.joinCreation().then(() => {
					this.themeService.setColorTheme(VS_DARK_THEME, false);
				});
			}
		});

		// 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.setZoomFactor(webFrame.getZoomFactor());
				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;
						}
					});
				}
			}
		});

		// Developer related actions
		const developerCategory = nls.localize('developer', "Developer");
		const workbenchActionsRegistry = Registry.as<IWorkbenchActionRegistry>(Extensions.WorkbenchActions);
		const isDeveloping = !this.environmentService.isBuilt || this.environmentService.isExtensionDevelopment;
		workbenchActionsRegistry.registerWorkbenchAction(new SyncActionDescriptor(ReloadWindowAction, ReloadWindowAction.ID, ReloadWindowAction.LABEL, isDeveloping ? { primary: KeyMod.CtrlCmd | KeyCode.KEY_R } : void 0), 'Reload Window');
		workbenchActionsRegistry.registerWorkbenchAction(new SyncActionDescriptor(ToggleDevToolsAction, ToggleDevToolsAction.ID, ToggleDevToolsAction.LABEL, isDeveloping ? { primary: KeyMod.CtrlCmd | KeyMod.Shift | KeyCode.KEY_I, mac: { primary: KeyMod.CtrlCmd | KeyMod.Alt | KeyCode.KEY_I } } : void 0), 'Developer: Toggle Developer Tools', developerCategory);
		workbenchActionsRegistry.registerWorkbenchAction(new SyncActionDescriptor(ShowStartupPerformance, ShowStartupPerformance.ID, ShowStartupPerformance.LABEL), 'Developer: Startup Performance', developerCategory);

		// Action registered here to prevent a keybinding conflict with reload window
		const fileCategory = nls.localize('file', "File");
		workbenchActionsRegistry.registerWorkbenchAction(new SyncActionDescriptor(OpenRecentAction, OpenRecentAction.ID, OpenRecentAction.LABEL, { primary: isDeveloping ? null : KeyMod.CtrlCmd | KeyCode.KEY_R, mac: { primary: KeyMod.WinCtrl | KeyCode.KEY_R } }), 'File: Open Recent', fileCategory);
	}

	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 && resources.length === 2) {
				return this.editorService.openEditor({ leftResource: resources[0].resource, rightResource: resources[1].resource });
			}

			// 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(ElectronWindow.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: ElectronWindow.AUTO_SAVE_SETTING, value: newAutoSaveValue }).done(null, (error) => this.messageService.show(Severity.Error, error));
	}

	private includesFolder(resources: URI[]): TPromise<boolean> {
		return TPromise.join(resources.map(resource => {
			return stat(resource.fsPath).then(stats => stats.isDirectory() ? true : false, error => false);
		})).then(res => res.some(res => !!res));
	}

	public close(): void {
		this.win.close();
	}

	public showMessageBox(options: Electron.ShowMessageBoxOptions): number {
		return dialog.showMessageBox(this.win, options);
	}

	public showSaveDialog(options: Electron.SaveDialogOptions, callback?: (fileName: string) => void): string {
		if (callback) {
			return dialog.showSaveDialog(this.win, options, callback);
		}

		return dialog.showSaveDialog(this.win, options); // https://github.com/electron/electron/issues/4936
	}

	public focus(): TPromise<void> {
		return this.windowService.focusWindow();
	}
}