import { LocalizedStrings } from "./../services/localizedStringsService";
import * as Utils from "./../util/utils";
import { Config } from "./../util/config";

export class DOMConsole {
  static get BASH_TEMPLATE () {
    return `
    <div class="bash-title">
      <i id="ivprog-console-clearbtn" class="icon eraser" style="float:left;padding-left: 5px"></i>
      <span>Terminal</span>
      <i id="ivprog-console-showbtn" class="icon window maximize outline" style="float:right"></i>
      <i id="ivprog-console-hidebtn" class="icon window minimize outline" style="float:right"></i>
    </div>
    <div id='ivprog-term' class="bash-body"></div>`;
  }

  static get INPUT_CARET_TEMPLATE () {
    return `
    <div id="cmd">
      <span></span>
      <div id="cursor"></div>
    </div>`;
  }

  static get USER () {
    return 0;
  }

  static get INFO () {
    return 1;
  }

  static get ERR () {
    return 2;
  }

  static get INPUT () {
    return 3;
  }

  constructor (elementID, disableMarginTop = false) {
    this.disableMarginTop = disableMarginTop;
    this.input = null;
    this.cursorInterval = null;
    this.idleInterval = null;
    this.inputDiv = null;
    this.inputCMD = null;
    this.inputSpan = null;
    this.cursorRef = null;
    this.needInput = false;
    this.clearBtn = null;
    this.hideBtn = null;
    this.showBtn = null;
    this.termDiv = null;
    this.anyKey = false;
    let actualID = elementID;
    if (elementID[0] === "#") {
      actualID = elementID.substring(1);
    }
    this.parent = document.getElementById(actualID);
    this.setup();
    this.inputListeners = [];
    this.hideInput();
    this.pending_writes = [];
    this.last_clear = -1;
  }

  setup () {
    this._setupDom();
    this._setupEvents();
  }

  _setupEvents () {
    this.input.addEventListener("keydown", this.registerInput.bind(this));
    this.clearBtn.addEventListener("click", this.clearBtnClick.bind(this));
    this.hideBtn.addEventListener("click", this.hideBtnClick.bind(this));
    this.showBtn.addEventListener("click", this.showBtnClick.bind(this));
  }

  registerInput (event) {
    if (!this.needInput) {
      return;
    }
    const keyCode = event.which;
    if (keyCode === 13 || this.anyKey) {
      if (this.idleInterval != null) {
        clearInterval(this.idleInterval);
        this.idleInterval = null;
      }
      let text = this.input.value;
      text = text.replace("[\n\r]+", "");
      this.notifyListeners(text);
      this._appendUserInput(text);
      this.input.value = "";
      this.inputSpan.innerHTML = "";
      this.currentLine = null;
    }
  }

  _setupDom () {
    const bashNode = document.createElement("div");
    bashNode.classList.add("bash");
    bashNode.innerHTML = DOMConsole.BASH_TEMPLATE;
    this.termDiv = bashNode.querySelector("#ivprog-term");
    this.termDiv.classList.add("ivprog-term-div");
    this.inputDiv = document.createElement("div");
    this.inputDiv.id = "ivprog-terminal-inputdiv";
    this.inputDiv.innerHTML = DOMConsole.INPUT_CARET_TEMPLATE;
    this.input = document.createElement("input");
    this.input.setAttribute("name", "command");
    this.input.setAttribute("value", "");
    this.input.setAttribute("type", "text");
    this.input.setAttribute("autocomplete", "off");
    this.inputDiv.append(this.input);
    this.termDiv.append(this.inputDiv);
    bashNode.append(this.termDiv);
    this.parent.append(bashNode);
    this.inputCMD = this.inputDiv.querySelector("#cmd");
    this.cursorRef = this.inputCMD.querySelector("#cursor");
    this.inputSpan = this.inputCMD.querySelector("span");
    this.clearBtn = bashNode.querySelector("#ivprog-console-clearbtn");
    this.hideBtn = bashNode.querySelector("#ivprog-console-hidebtn");
    this.showBtn = bashNode.querySelector("#ivprog-console-showbtn");
    this._setupCursor();
    //Jquery tooltips....
    window
      .$(this.clearBtn)
      .popup({ content: LocalizedStrings.getUI("tooltip_terminal_clear") });
    window
      .$(this.showBtn)
      .popup({ content: LocalizedStrings.getUI("tooltip_terminal_show") });
    window
      .$(this.hideBtn)
      .popup({ content: LocalizedStrings.getUI("tooltip_terminal_hide") });
  }

  _setupCursor () {
    this.inputCMD.addEventListener("click", this.blinkCaretAndFocus.bind(this));
    //this.inputCMD.click();

    this.input.addEventListener("keyup", this.updateSpanText.bind(this));
    this.input.addEventListener("blur", this.stopBlinkCaret.bind(this));
  }

  blinkCaretAndFocus () {
    if (this.cursorInterval != null) {
      return;
    }
    this.input.focus();
    this.cursorInterval = window.setInterval(() => {
      if (this.cursorRef.style.visibility === "visible") {
        this.cursorRef.style.visibility = "hidden";
      } else {
        this.cursorRef.style.visibility = "visible";
      }
    }, 500);
  }

  updateSpanText () {
    this.inputSpan.innerHTML = this.input.value;
    if (this.idleInterval != null) window.clearInterval(this.idleInterval);
    this.scheduleNotify();
  }

  stopBlinkCaret () {
    clearInterval(this.cursorInterval);
    this.cursorInterval = null;
    this.cursorRef.style.visibility = "visible";
  }

  notifyListeners (text) {
    this.inputListeners.forEach((resolve) => resolve(text));
    this.inputListeners.splice(0, this.inputListeners.length);
    this.hideInput();
    this.anyKey = false;
  }

  writeRawHTML (text, channel) {
    this._appendTextLn(text, channel, false);
  }

  write (text, newLine = false) {
    this._appendText(text, DOMConsole.USER, newLine);
  }

  info (text) {
    this._appendTextLn(text, DOMConsole.INFO);
  }

  err (text) {
    this._appendTextLn(text, DOMConsole.ERR);
  }

  async _appendText (text, type, newLine = false) {
    // console.debug("Caling appendText");
    const write_time = Date.now();
    this.pending_writes.push(0);
    await Utils.sleep(5);
    this.pending_writes.pop();
    if (this.last_clear >= write_time) {
      return;
    }

    if (this.currentLine == null) {
      const divClass = this.getClassForType(type);
      const textDiv = document.createElement("div");
      textDiv.classList.add(divClass);
      this.termDiv.insertBefore(textDiv, this.inputDiv);
      this.currentLine = textDiv;
    }
    this.currentLine.innerHTML += this.getOutputText(text);
    if (newLine) {
      // console.debug("append newline");
      this.currentLine = null;
    }
    this.scrollTerm();
  }

  async _appendTextLn (text, type, filter = true) {
    const write_time = Date.now();
    this.pending_writes.push(0);
    await Utils.sleep(5);
    this.pending_writes.pop();
    if (this.last_clear >= write_time) {
      return;
    }
    const divClass = this.getClassForType(type);
    const textDiv = document.createElement("div");
    textDiv.classList.add(divClass);
    if (filter) textDiv.innerHTML = this.getOutputText(text);
    else textDiv.innerHTML = `<span>${text}</span>`;
    if (this.currentLine != null && this.currentLine.innerHTML.length === 0) {
      this.termDiv.removeChild(this.currentLine);
    }
    this.termDiv.insertBefore(textDiv, this.inputDiv);
    this.currentLine = null;
    this.scrollTerm();
  }

  async _appendUserInput (text) {
    const write_time = Date.now();
    this.pending_writes.push(0);
    await Utils.sleep(5);
    this.pending_writes.pop();
    if (this.last_clear >= write_time) {
      return;
    }
    const divClass = this.getClassForType(DOMConsole.INPUT);
    const textDiv = document.createElement("div");
    textDiv.innerHTML = this.getUserInputText(text);
    textDiv.classList.add(divClass);
    this.termDiv.insertBefore(textDiv, this.inputDiv);
    this.currentLine = null;
    this.scrollTerm();
  }

  getOutputText (text) {
    text = text.replace(/\s/g, "&#160;");
    return `<span>${text}</span>`;
  }

  getUserInputText (text) {
    if (text.trim().length == 0) {
      text = "&nbsp;";
    }
    return `<i class="icon keyboard outline" style="float:left"></i><span>${text}</span>`;
  }

  scrollTerm () {
    //scrollIt(this.inputDiv.previousSibling,200);
    this.termDiv.scrollTop = this.termDiv.scrollHeight;
  }

  focus () {
    this.termDiv.style.display = "block";
    // Is in draggable mode?
    if (!this.disableMarginTop && this.parent.style.top.length == 0) {
      this.parent.style.marginTop = "-160px";
    }
    if (this.needInput) {
      this.showInput();
      this.scheduleNotify();
    }
    if (!Utils.isElementInViewport(this.termDiv))
      this.termDiv.scrollIntoView(false);
    this.scrollTerm();
  }

  hide () {
    if (this.needInput) {
      clearInterval(this.idleInterval);
      this.hideInput();
      this.needInput = true;
    }
    // Is in draggable mode?
    if (!this.disableMarginTop && this.parent.style.top.length == 0) {
      this.parent.style.marginTop = "0";
    }
    this.termDiv.style.display = "none";
  }

  getClassForType (type) {
    switch (type) {
      case DOMConsole.INPUT:
        return "ivprog-term-userInput";
      case DOMConsole.USER:
        return "ivprog-term-userText";
      case DOMConsole.INFO:
        return "ivprog-term-info";
      case DOMConsole.ERR:
        return "ivprog-term-error";
    }
  }

  dispose () {
    this.input.removeEventListener("keyup", this.updateSpanText.bind(this));
    this.input.removeEventListener("blur", this.stopBlinkCaret.bind(this));
    this.input.removeEventListener("keydown", this.registerInput.bind(this));
    this.inputCMD.removeEventListener(
      "click",
      this.blinkCaretAndFocus.bind(this)
    );
    this.clearBtn.removeEventListener("click", this.clearBtnClick.bind(this));
    this.hideBtn.removeEventListener("click", this.hideBtnClick.bind(this));
    this.showBtn.removeEventListener("click", this.showBtnClick.bind(this));
    this.input = null;
    this.inputCMD = null;
    this.inputDiv = null;
    this.termDiv = null;
    this.inputSpan = null;
    this.cursorRef = null;
    this.clearBtn = null;
    this.hideBtn = null;
    this.showBtn = null;
    this.currentLine = null;
    const cNode = this.parent.cloneNode(false);
    this.parent.parentNode.replaceChild(cNode, this.parent);
    if (this.cursorInterval != null) {
      clearInterval(this.cursorInterval);
    }
    if (this.idleInterval != null) {
      clearInterval(this.idleInterval);
    }
  }

  showInput () {
    this.needInput = true;
    this.inputDiv.style.display = "block";
    this.inputCMD.click();
    //this.inputCMD.scrollIntoView();
    this.scrollTerm();
  }

  hideInput () {
    this.needInput = false;
    this.inputDiv.style.display = " none";
    clearInterval(this.cursorInterval);
    this.cursorInterval = null;
  }

  requestInput (anyKey = false) {
    const promise = new Promise((resolve, _) => {
      this.inputListeners.push(resolve);
      this.anyKey = anyKey;
      if (this.idleInterval == null) this.scheduleNotify();
      this.showInput();
    });
    return promise;
  }

  sendOutput (text) {
    //console.debug(text);
    let output = "" + text;
    if (output.indexOf("\n") !== -1) {
      //console.debug("newline");
      const outputList = output.split("\n");
      let i = 0;
      for (; i < outputList.length - 1; i += 1) {
        //console.debug("newline write");
        let t = outputList[i];
        t = t.replace(/\t/g, "&#x0020;&#x0020;");
        t = t.replace(/\s/g, "&#x0020;");
        if (t.length !== 0) {
          this.write(t);
        }
        this.write("", true);
      }
      let t = outputList[i];
      t = t.replace(/\t/g, "&#x0020;&#x0020;");
      t = t.replace(/\s/g, "&#x0020;");
      if (t.length != 0) this.write(t);
    } else {
      // console.debug("no newline");
      output = output.replace(/\t/g, "&#x0020;&#x0020;");
      output = output.replace(/\s/g, "&#x0020;");
      if (output.length != 0) this.write(output);
    }
  }

  clearPendingWrites () {
    this.last_clear = Date.now();
  }

  clear () {
    this.clearPendingWrites();
    while (this.inputDiv.parentElement.childNodes.length > 1) {
      this.inputDiv.parentElement.removeChild(
        this.inputDiv.parentElement.firstChild
      );
    }
    this.input.value = "";
    this.inputSpan.innerHTML = "";
    this.currentLine = null;
  }

  clearBtnClick () {
    this.clear();
  }

  showBtnClick () {
    this.focus();
  }

  hideBtnClick () {
    this.hide();
  }

  notifyIdle () {
    this.info(LocalizedStrings.getMessage("awaiting_input_message"));
    this.inputCMD.click();
  }

  scheduleNotify () {
    this.idleInterval = window.setInterval(
      this.notifyIdle.bind(this),
      Config.idle_input_interval
    );
  }

  cancelPendingInputRequests () {
    this.inputListeners.forEach((resolve) => resolve(""));
    this.inputListeners.splice(0, this.inputListeners.length);
    if (this.idleInterval != null) {
      clearInterval(this.idleInterval);
      this.idleInterval = null;
    }
    this.input.value = "";
    this.inputSpan.innerHTML = "";
    this.currentLine = null;
    this.hideInput();
    this.anyKey = false;
  }
}