// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.

// tslint:disable-next-line
/// <reference path="./typings/json-to-html/json-to-html.d.ts"/>

import json2html = require('json-to-html');

import { simulate } from 'simulate-event';

import { ServiceManager } from '@jupyterlab/services';

import { ClientSession } from '@jupyterlab/apputils';

import { nbformat } from '@jupyterlab/coreutils';

import { UUID } from '@phosphor/coreutils';

import {
  TextModelFactory,
  DocumentRegistry,
  Context
} from '@jupyterlab/docregistry';

import { INotebookModel, NotebookModelFactory } from '@jupyterlab/notebook';

import {
  IRenderMime,
  RenderMimeRegistry,
  RenderedHTML,
  standardRendererFactories
} from '@jupyterlab/rendermime';

/**
 * Return a promise that resolves in the given milliseconds with the given value.
 */
export function sleep<T>(milliseconds: number = 0, value?: T): Promise<T> {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve(value);
    }, milliseconds);
  });
}

export function moment<T>(value?: T): Promise<T> {
  return new Promise((resolve, reject) => {
    requestAnimationFrame(() => {
      resolve(value);
    });
  });
}

/**
 * Get a copy of the default rendermime instance.
 */
export function defaultRenderMime(): RenderMimeRegistry {
  return Private.rendermime.clone();
}

/**
 * Create a client session object.
 */
export function createClientSession(
  options: Partial<ClientSession.IOptions> = {}
): Promise<ClientSession> {
  let manager = options.manager || Private.manager.sessions;
  return manager.ready.then(() => {
    return new ClientSession({
      manager,
      path: options.path || UUID.uuid4(),
      name: options.name,
      type: options.type,
      kernelPreference: options.kernelPreference || {
        shouldStart: true,
        canStart: true,
        name: manager.specs.default
      }
    });
  });
}

/**
 * Create a context for a file.
 */
export function createFileContext(
  path?: string,
  manager?: ServiceManager.IManager
): Context<DocumentRegistry.IModel> {
  manager = manager || Private.manager;
  let factory = Private.textFactory;
  path = path || UUID.uuid4() + '.txt';
  return new Context({ manager, factory, path });
}

/**
 * Create a context for a notebook.
 */
export async function createNotebookContext(
  path?: string,
  manager?: ServiceManager.IManager
): Promise<Context<INotebookModel>> {
  manager = manager || Private.manager;
  await manager.ready;
  const factory = Private.notebookFactory;
  path = path || UUID.uuid4() + '.ipynb';
  return new Context({
    manager,
    factory,
    path,
    kernelPreference: { name: manager.specs.default }
  });
}

/**
 * Wait for a dialog to be attached to an element.
 */
export function waitForDialog(
  host: HTMLElement = document.body
): Promise<void> {
  return new Promise<void>((resolve, reject) => {
    let refresh = () => {
      let node = host.getElementsByClassName('jp-Dialog')[0];
      if (node) {
        resolve(void 0);
        return;
      }
      setTimeout(refresh, 10);
    };
    refresh();
  });
}

/**
 * Accept a dialog after it is attached by accepting the default button.
 */
export function acceptDialog(host: HTMLElement = document.body): Promise<void> {
  return waitForDialog(host).then(() => {
    let node = host.getElementsByClassName('jp-Dialog')[0];
    if (node) {
      simulate(node as HTMLElement, 'keydown', { keyCode: 13 });
    }
  });
}

/**
 * Dismiss a dialog after it is attached.
 */
export function dismissDialog(
  host: HTMLElement = document.body
): Promise<void> {
  return waitForDialog(host).then(() => {
    let node = host.getElementsByClassName('jp-Dialog')[0];
    if (node) {
      simulate(node as HTMLElement, 'keydown', { keyCode: 27 });
    }
  });
}

/**
 * A namespace for private data.
 */
namespace Private {
  export const manager = new ServiceManager();

  export const textFactory = new TextModelFactory();

  export const notebookFactory = new NotebookModelFactory({});

  class JSONRenderer extends RenderedHTML {
    mimeType = 'text/html';

    renderModel(model: IRenderMime.IMimeModel): Promise<void> {
      let source = model.data['application/json'];
      model.setData({ data: { 'text/html': json2html(source) } });
      return super.renderModel(model);
    }
  }

  const jsonRendererFactory = {
    mimeTypes: ['application/json'],
    safe: true,
    createRenderer(
      options: IRenderMime.IRendererOptions
    ): IRenderMime.IRenderer {
      return new JSONRenderer(options);
    }
  };

  export const rendermime = new RenderMimeRegistry({
    initialFactories: standardRendererFactories
  });
  rendermime.addFactory(jsonRendererFactory, 10);
}

/**
 * The default outputs used for testing.
 */
export const DEFAULT_OUTPUTS: nbformat.IOutput[] = [
  {
    name: 'stdout',
    output_type: 'stream',
    text: ['hello world\n', '0\n', '1\n', '2\n']
  },
  {
    name: 'stderr',
    output_type: 'stream',
    text: ['output to stderr\n']
  },
  {
    name: 'stderr',
    output_type: 'stream',
    text: ['output to stderr2\n']
  },
  {
    output_type: 'execute_result',
    execution_count: 1,
    data: { 'text/plain': 'foo' },
    metadata: {}
  },
  {
    output_type: 'display_data',
    data: { 'text/plain': 'hello, world' },
    metadata: {}
  },
  {
    output_type: 'error',
    ename: 'foo',
    evalue: 'bar',
    traceback: ['fizz', 'buzz']
  }
];