import {
  DeesElement,
  property,
  html,
  customElement,
  type TemplateResult,
  css,
  cssManager,
} from '@design.estate/dees-element';
import * as domtools from '@design.estate/dees-domtools';

import * as webcontainer from '@webcontainer/api';

import { Terminal } from 'xterm';
import { FitAddon } from 'xterm-addon-fit';

declare global {
  interface HTMLElementTagNameMap {
    'dees-terminal': DeesTerminal;
  }
}

@customElement('dees-terminal')
export class DeesTerminal extends DeesElement {
  public static demo = () => html` <dees-terminal></dees-terminal> `;

  // INSTANCE
  private resizeObserver: ResizeObserver;

  @property()
  public setupCommand = `pnpm install @git.zone/tsbuild && clear && echo 'welcome'`;

  constructor() {
    super();
    this.resizeObserver = new ResizeObserver((entries) => {
      for (const entry of entries) {
        // Handle the resize event
        console.log(`Terminal Resized`);
        this.handleResize();
      }
    });
  }

  public static styles = [
    cssManager.defaultStyles,
    css`
      :host {
        padding: 20px;
        background: #000;
        position: absolute;
        height: 100%;
        width: 100%;
      }

      * {
        box-sizing: border-box;
      }

      #container {
        position: absolute;
        height: calc(100% - 40px);
        width: calc(100% - 40px);
      }
      /**
      * Copyright (c) 2014 The xterm.js authors. All rights reserved.
      * Copyright (c) 2012-2013, Christopher Jeffrey (MIT License)
      * https://github.com/chjj/term.js
      * @license MIT
      *
      * Permission is hereby granted, free of charge, to any person obtaining a copy
      * of this software and associated documentation files (the "Software"), to deal
      * in the Software without restriction, including without limitation the rights
      * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      * copies of the Software, and to permit persons to whom the Software is
      * furnished to do so, subject to the following conditions:
      *
      * The above copyright notice and this permission notice shall be included in
      * all copies or substantial portions of the Software.
      *
      * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
      * THE SOFTWARE.
      *
      * Originally forked from (with the author's permission):
      *   Fabrice Bellard's javascript vt100 for jslinux:
      *   http://bellard.org/jslinux/
      *   Copyright (c) 2011 Fabrice Bellard
      *   The original design remains. The terminal itself
      *   has been extended to include xterm CSI codes, among
      *   other features.
      */

      /**
      *  Default styles for xterm.js
      */

      .xterm {
        font-feature-settings: 'liga' 0;
        position: relative;
        user-select: none;
        -ms-user-select: none;
        -webkit-user-select: none;
      }

      .xterm.focus,
      .xterm:focus {
        outline: none;
      }

      .xterm .xterm-helpers {
        position: absolute;
        top: 0;
        /**
          * The z-index of the helpers must be higher than the canvases in order for
          * IMEs to appear on top.
          */
        z-index: 5;
      }

      .xterm .xterm-helper-textarea {
        padding: 0;
        border: 0;
        margin: 0;
        /* Move textarea out of the screen to the far left, so that the cursor is not visible */
        position: absolute;
        opacity: 0;
        left: -9999em;
        top: 0;
        width: 0;
        height: 0;
        z-index: -5;
        /** Prevent wrapping so the IME appears against the textarea at the correct position */
        white-space: nowrap;
        overflow: hidden;
        resize: none;
      }

      .xterm .composition-view {
        /* TODO: Composition position got messed up somewhere */
        background: #000;
        color: #fff;
        display: none;
        position: absolute;
        white-space: nowrap;
        z-index: 1;
      }

      .xterm .composition-view.active {
        display: block;
      }

      .xterm .xterm-viewport {
        /* On OS X this is required in order for the scroll bar to appear fully opaque */
        background-color: #000;
        overflow-y: scroll;
        cursor: default;
        position: absolute;
        right: 0;
        left: 0;
        top: 0;
        bottom: 0;
      }

      .xterm .xterm-screen {
        position: relative;
      }

      .xterm .xterm-screen canvas {
        position: absolute;
        left: 0;
        top: 0;
      }

      .xterm .xterm-scroll-area {
        visibility: hidden;
      }

      .xterm-char-measure-element {
        display: inline-block;
        visibility: hidden;
        position: absolute;
        top: 0;
        left: -9999em;
        line-height: normal;
      }

      .xterm {
        cursor: text;
      }

      .xterm.enable-mouse-events {
        /* When mouse events are enabled (eg. tmux), revert to the standard pointer cursor */
        cursor: default;
      }

      .xterm.xterm-cursor-pointer {
        cursor: pointer;
      }

      .xterm.column-select.focus {
        /* Column selection mode */
        cursor: crosshair;
      }

      .xterm .xterm-accessibility,
      .xterm .xterm-message {
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        right: 0;
        z-index: 10;
        color: transparent;
      }

      .xterm .live-region {
        position: absolute;
        left: -9999px;
        width: 1px;
        height: 1px;
        overflow: hidden;
      }

      .xterm-dim {
        opacity: 0.5;
      }

      .xterm-underline {
        text-decoration: underline;
      }
    `,
  ];

  public render(): TemplateResult {
    return html`
      <div class="mainbox">
        <div id="container"></div>
      </div>
    `;
  }

  private fitAddon: FitAddon;
  public async firstUpdated(
    _changedProperties: Map<string | number | symbol, unknown>
  ): Promise<void> {
    const domtools = await this.domtoolsPromise;
    super.firstUpdated(_changedProperties);
    const container = this.shadowRoot.getElementById('container');

    const term = new Terminal({
      convertEol: true,
      cursorBlink: true,
    });
    this.fitAddon = new FitAddon();
    term.loadAddon(this.fitAddon);

    // Open the terminal in #terminal-container
    term.open(container);

    // Make the terminal's size and geometry fit the size of #terminal-container
    this.fitAddon.fit();

    term.write(`dees-terminal custom terminal. \r\n$ `);

    // lets start the webcontainer
    // Call only once
    const webcontainerInstance = await webcontainer.WebContainer.boot();
    const shellProcess = await webcontainerInstance.spawn('jsh');
    shellProcess.output.pipeTo(
      new WritableStream({
        write(data) {
          term.write(data);
        },
      })
    );
    const input = shellProcess.input.getWriter();
    term.onData((data) => {
      input.write(data);
    });
    await this.waitForPrompt(term, '~/');
    input.write(this.setupCommand);
    input.write(`\n`);
  }

  async connectedCallback(): Promise<void> {
    await super.connectedCallback();
    this.resizeObserver.observe(this);
  }

  async disconnectedCallback(): Promise<void> {
    this.resizeObserver.unobserve(this);
    await super.disconnectedCallback();
  }

  handleResize() {
    this.fitAddon.fit();
  }

  private async waitForPrompt(term: Terminal, prompt: string): Promise<void> {
    return new Promise<void>((resolve) => {
      const checkPrompt = () => {
        const lines = term.buffer.active;
        for (let i = 0; i < lines.length; i++) {
          const line = lines.getLine(i);
          if (line && line.translateToString().includes(prompt)) {
            resolve();
            return;
          }
        }
        setTimeout(checkPrompt, 100); // check every 100 ms
      };
  
      checkPrompt();
    });
  }
}