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

import { Disposable } from 'vs/base/common/lifecycle';
import { localize } from 'vs/nls';
import { SyncDescriptor } from 'vs/platform/instantiation/common/descriptors';
import { IInstantiationService, ServicesAccessor } from 'vs/platform/instantiation/common/instantiation';
import { Registry } from 'vs/platform/registry/common/platform';
import { TreeView, TreeViewPane } from 'vs/workbench/browser/parts/views/treeView';
import { Extensions, ITreeItem, ITreeViewDataProvider, ITreeViewDescriptor, IViewsRegistry, TreeItemCollapsibleState, TreeViewItemHandleArg, ViewContainer } from 'vs/workbench/common/views';
import { ChangeType, EDIT_SESSIONS_DATA_VIEW_ID, EDIT_SESSIONS_SCHEME, EDIT_SESSIONS_SHOW_VIEW, EDIT_SESSIONS_TITLE, EditSession, IEditSessionsStorageService } from 'vs/workbench/contrib/editSessions/common/editSessions';
import { URI } from 'vs/base/common/uri';
import { fromNow } from 'vs/base/common/date';
import { Codicon } from 'vs/base/common/codicons';
import { API_OPEN_EDITOR_COMMAND_ID } from 'vs/workbench/browser/parts/editor/editorCommands';
import { registerAction2, Action2, MenuId } from 'vs/platform/actions/common/actions';
import { ContextKeyExpr, IContextKeyService, RawContextKey } from 'vs/platform/contextkey/common/contextkey';
import { ICommandService } from 'vs/platform/commands/common/commands';
import { IDialogService } from 'vs/platform/dialogs/common/dialogs';
import { IWorkspaceContextService } from 'vs/platform/workspace/common/workspace';
import { joinPath } from 'vs/base/common/resources';
import { IFileService } from 'vs/platform/files/common/files';
import { basename } from 'vs/base/common/path';

const EDIT_SESSIONS_COUNT_KEY = 'editSessionsCount';
const EDIT_SESSIONS_COUNT_CONTEXT_KEY = new RawContextKey<number>(EDIT_SESSIONS_COUNT_KEY, 0);

export class EditSessionsDataViews extends Disposable {
	constructor(
		container: ViewContainer,
		@IInstantiationService private readonly instantiationService: IInstantiationService,
	) {
		super();
		this.registerViews(container);
	}

	private registerViews(container: ViewContainer): void {
		const viewId = EDIT_SESSIONS_DATA_VIEW_ID;
		const treeView = this.instantiationService.createInstance(TreeView, viewId, EDIT_SESSIONS_TITLE.value);
		treeView.showCollapseAllAction = true;
		treeView.showRefreshAction = true;
		treeView.dataProvider = this.instantiationService.createInstance(EditSessionDataViewDataProvider);

		const viewsRegistry = Registry.as<IViewsRegistry>(Extensions.ViewsRegistry);
		viewsRegistry.registerViews([<ITreeViewDescriptor>{
			id: viewId,
			name: EDIT_SESSIONS_TITLE,
			ctorDescriptor: new SyncDescriptor(TreeViewPane),
			canToggleVisibility: true,
			canMoveView: false,
			treeView,
			collapsed: false,
			when: ContextKeyExpr.and(EDIT_SESSIONS_SHOW_VIEW),
			order: 100,
			hideByDefault: true,
		}], container);

		viewsRegistry.registerViewWelcomeContent(viewId, {
			content: localize(
				'noStoredChanges',
				'You have no stored changes in the cloud to display.\n{0}',
				`[${localize('storeWorkingChangesTitle', 'Store Working Changes')}](command:workbench.editSessions.actions.store)`,
			),
			when: ContextKeyExpr.equals(EDIT_SESSIONS_COUNT_KEY, 0),
			order: 1
		});

		registerAction2(class extends Action2 {
			constructor() {
				super({
					id: 'workbench.editSessions.actions.resume',
					title: localize('workbench.editSessions.actions.resume.v2', "Resume Working Changes"),
					icon: Codicon.desktopDownload,
					menu: {
						id: MenuId.ViewItemContext,
						when: ContextKeyExpr.and(ContextKeyExpr.equals('view', viewId), ContextKeyExpr.regex('viewItem', /edit-session/i)),
						group: 'inline'
					}
				});
			}

			async run(accessor: ServicesAccessor, handle: TreeViewItemHandleArg): Promise<void> {
				const editSessionId = URI.parse(handle.$treeItemHandle).path.substring(1);
				const commandService = accessor.get(ICommandService);
				await commandService.executeCommand('workbench.editSessions.actions.resumeLatest', editSessionId, true);
				await treeView.refresh();
			}
		});

		registerAction2(class extends Action2 {
			constructor() {
				super({
					id: 'workbench.editSessions.actions.store',
					title: localize('workbench.editSessions.actions.store.v2', "Store Working Changes"),
					icon: Codicon.cloudUpload,
				});
			}

			async run(accessor: ServicesAccessor, handle: TreeViewItemHandleArg): Promise<void> {
				const commandService = accessor.get(ICommandService);
				await commandService.executeCommand('workbench.editSessions.actions.storeCurrent');
				await treeView.refresh();
			}
		});

		registerAction2(class extends Action2 {
			constructor() {
				super({
					id: 'workbench.editSessions.actions.delete',
					title: localize('workbench.editSessions.actions.delete.v2', "Delete Working Changes"),
					icon: Codicon.trash,
					menu: {
						id: MenuId.ViewItemContext,
						when: ContextKeyExpr.and(ContextKeyExpr.equals('view', viewId), ContextKeyExpr.regex('viewItem', /edit-session/i)),
						group: 'inline'
					}
				});
			}

			async run(accessor: ServicesAccessor, handle: TreeViewItemHandleArg): Promise<void> {
				const editSessionId = URI.parse(handle.$treeItemHandle).path.substring(1);
				const dialogService = accessor.get(IDialogService);
				const editSessionStorageService = accessor.get(IEditSessionsStorageService);
				const result = await dialogService.confirm({
					message: localize('confirm delete.v2', 'Are you sure you want to permanently delete your working changes with ref {0}?', editSessionId),
					detail: localize('confirm delete detail.v2', ' You cannot undo this action.'),
					type: 'warning',
					title: EDIT_SESSIONS_TITLE.value
				});
				if (result.confirmed) {
					await editSessionStorageService.delete('editSessions', editSessionId);
					await treeView.refresh();
				}
			}
		});

		registerAction2(class extends Action2 {
			constructor() {
				super({
					id: 'workbench.editSessions.actions.deleteAll',
					title: localize('workbench.editSessions.actions.deleteAll', "Delete All Working Changes from Cloud"),
					icon: Codicon.trash,
					menu: {
						id: MenuId.ViewTitle,
						when: ContextKeyExpr.and(ContextKeyExpr.equals('view', viewId), ContextKeyExpr.greater(EDIT_SESSIONS_COUNT_KEY, 0)),
					}
				});
			}

			async run(accessor: ServicesAccessor): Promise<void> {
				const dialogService = accessor.get(IDialogService);
				const editSessionStorageService = accessor.get(IEditSessionsStorageService);
				const result = await dialogService.confirm({
					message: localize('confirm delete all', 'Are you sure you want to permanently delete all stored changes from the cloud?'),
					detail: localize('confirm delete all detail', ' You cannot undo this action.'),
					type: 'warning',
					title: EDIT_SESSIONS_TITLE.value
				});
				if (result.confirmed) {
					await editSessionStorageService.delete('editSessions', null);
					await treeView.refresh();
				}
			}
		});
	}
}

class EditSessionDataViewDataProvider implements ITreeViewDataProvider {

	private editSessionsCount;

	constructor(
		@IEditSessionsStorageService private readonly editSessionsStorageService: IEditSessionsStorageService,
		@IContextKeyService private readonly contextKeyService: IContextKeyService,
		@IWorkspaceContextService private readonly workspaceContextService: IWorkspaceContextService,
		@IFileService private readonly fileService: IFileService,
	) {
		this.editSessionsCount = EDIT_SESSIONS_COUNT_CONTEXT_KEY.bindTo(this.contextKeyService);
	}

	async getChildren(element?: ITreeItem): Promise<ITreeItem[]> {
		if (!element) {
			return this.getAllEditSessions();
		}

		const [ref, folderName, filePath] = URI.parse(element.handle).path.substring(1).split('/');

		if (ref && !folderName) {
			return this.getEditSession(ref);
		} else if (ref && folderName && !filePath) {
			return this.getEditSessionFolderContents(ref, folderName);
		}

		return [];
	}

	private async getAllEditSessions(): Promise<ITreeItem[]> {
		const allEditSessions = await this.editSessionsStorageService.list('editSessions');
		this.editSessionsCount.set(allEditSessions.length);
		const editSessions = [];

		for (const session of allEditSessions) {
			const resource = URI.from({ scheme: EDIT_SESSIONS_SCHEME, authority: 'remote-session-content', path: `/${session.ref}` });
			const sessionData = await this.editSessionsStorageService.read('editSessions', session.ref);
			if (!sessionData) {
				continue;
			}
			const content: EditSession = JSON.parse(sessionData.content);
			const label = content.folders.map((folder) => folder.name).join(', ') ?? session.ref;
			const machineId = content.machine;
			const machineName = machineId ? await this.editSessionsStorageService.getMachineById(machineId) : undefined;
			const description = machineName === undefined ? fromNow(session.created, true) : `${fromNow(session.created, true)}\u00a0\u00a0\u2022\u00a0\u00a0${machineName}`;

			editSessions.push({
				handle: resource.toString(),
				collapsibleState: TreeItemCollapsibleState.Collapsed,
				label: { label },
				description: description,
				themeIcon: Codicon.repo,
				contextValue: `edit-session`
			});
		}

		return editSessions;
	}

	private async getEditSession(ref: string): Promise<ITreeItem[]> {
		const data = await this.editSessionsStorageService.read('editSessions', ref);

		if (!data) {
			return [];
		}
		const content: EditSession = JSON.parse(data.content);

		if (content.folders.length === 1) {
			const folder = content.folders[0];
			return this.getEditSessionFolderContents(ref, folder.name);
		}

		return content.folders.map((folder) => {
			const resource = URI.from({ scheme: EDIT_SESSIONS_SCHEME, authority: 'remote-session-content', path: `/${data.ref}/${folder.name}` });
			return {
				handle: resource.toString(),
				collapsibleState: TreeItemCollapsibleState.Collapsed,
				label: { label: folder.name },
				themeIcon: Codicon.folder
			};
		});
	}

	private async getEditSessionFolderContents(ref: string, folderName: string): Promise<ITreeItem[]> {
		const data = await this.editSessionsStorageService.read('editSessions', ref);

		if (!data) {
			return [];
		}
		const content: EditSession = JSON.parse(data.content);

		const currentWorkspaceFolder = this.workspaceContextService.getWorkspace().folders.find((folder) => folder.name === folderName);
		const editSessionFolder = content.folders.find((folder) => folder.name === folderName);

		if (!editSessionFolder) {
			return [];
		}

		return Promise.all(editSessionFolder.workingChanges.map(async (change) => {
			const cloudChangeUri = URI.from({ scheme: EDIT_SESSIONS_SCHEME, authority: 'remote-session-content', path: `/${data.ref}/${folderName}/${change.relativeFilePath}` });

			if (currentWorkspaceFolder?.uri) {
				// find the corresponding file in the workspace
				const localCopy = joinPath(currentWorkspaceFolder.uri, change.relativeFilePath);
				if (change.type === ChangeType.Addition && await this.fileService.exists(localCopy)) {
					return {
						handle: cloudChangeUri.toString(),
						resourceUri: cloudChangeUri,
						collapsibleState: TreeItemCollapsibleState.None,
						label: { label: change.relativeFilePath },
						themeIcon: Codicon.file,
						command: {
							id: 'vscode.diff',
							title: localize('compare changes', 'Compare Changes'),
							arguments: [
								localCopy,
								cloudChangeUri,
								`${basename(change.relativeFilePath)} (${localize('local copy', 'Local Copy')} \u2194 ${localize('cloud changes', 'Cloud Changes')})`,
								undefined
							]
						}
					};
				}
			}

			return {
				handle: cloudChangeUri.toString(),
				resourceUri: cloudChangeUri,
				collapsibleState: TreeItemCollapsibleState.None,
				label: { label: change.relativeFilePath },
				themeIcon: Codicon.file,
				command: {
					id: API_OPEN_EDITOR_COMMAND_ID,
					title: localize('open file', 'Open File'),
					arguments: [cloudChangeUri, undefined, undefined]
				}
			};
		}));
	}
}
