let WINDOWS: { [key: string]: _winConf } = {};
let MOUSE_MOVE_PROCESSING: {
  [key: string]: {
    callback: (x: number, y: number) => void,
    mouseUp: boolean
  }
} = {};

let globalIncrement: number = 1;

function escapeHTML(string: string): string {
  return string.replaceAll("&", "&amp;").replaceAll("<", "&lt;").replaceAll("\"", "&quot;");
}

function incrementZIndex(windowID: string, focus: boolean=false): void {
  WINDOWS[windowID].element.style.zIndex = String(globalIncrement);
  WINDOWS[windowID].zIndex = globalIncrement;
  globalIncrement++;

  if (focus) {
    WINDOWS[windowID].element.focus();
  }
}

function createWindow(config: _winInitConf): void {
  if (document.getElementById(config.id)) {
    incrementZIndex(config.id);
    return;
  }

  // 1 - border
  // 10 - padding
  // 35 - header
  let _windowPaddingX: number = 1*2 + 10*2;
  let _windowPaddingY: number = 1*2 + 10*2 + 35;

  config.width = config.width || 600;
  config.height = config.height || 400;
  config.minWidth = config.minWidth || 200;
  config.minHeight = config.minHeight || 200;

  let realWidth: number = Math.max(config.minWidth, Math.min(config.width, innerWidth - _windowPaddingX - 20));
  let realHeight: number = Math.max(config.minHeight, Math.min(config.height, innerHeight - _windowPaddingY - 20));

  let posX: number = config.posX || Math.round((innerWidth / 2) - ((realWidth + _windowPaddingX) / 2));
  let posY: number = config.posY || Math.round((innerHeight / 2) - ((realHeight + _windowPaddingY) / 2));

  let wO: HTMLDivElement = document.createElement("div");
  wO.classList.add("window-outer");

  let w: HTMLDivElement = document.createElement("div");
  w.classList.add("window");
  w.style.width = `${realWidth}px`;
  w.style.height = `${realHeight}px`;
  w.innerHTML = config.content;

  let wH: HTMLDivElement = document.createElement("div");
  wH.classList.add("window-header");
  wH.innerHTML = `
    <i class="window-header-button blank"></i>
    <i class="window-header-button blank"></i>
    <i class="window-header-button blank"></i>
    <strong class="window-header-title">${config.title}</strong>
    <i data-no-move class="window-header-button minimize"></i>
    <i data-no-move class="window-header-button fullscreen"></i>
    <i data-no-move class="window-header-button close"></i>
  `;

  let wC: HTMLDivElement | HTMLLabelElement;
  let wI: HTMLInputElement = null;
  if (config.typeable !== false) {
    function syncInputs(): void {
      setTimeout(function(): void {
        let text: string = wI.value;
        let cursor: number = wI.selectionStart;
        let el: HTMLElement = wC.querySelector("[data-type-area]");

        if (!el) { return; }

        if (cursor == text.length) {
          el.innerHTML = `${escapeHTML(text)}<i class="cursor">&nbsp;</i>`;
        } else {
          el.innerHTML = `${escapeHTML(text.slice(0, cursor))}<span class="cursor">${escapeHTML(text[cursor])}</span>${escapeHTML(text.slice(cursor + 1))}`;
        }
      }, 1);
    }

    function setCursor(): void {
      setTimeout((): void => {
        wI.setSelectionRange(wI.value.length, wI.value.length);
        syncInputs();
      }, 0);
    }

    wI = document.createElement("input");
    wI.classList.add("window-input");
    wI.id = `${config.id}__input`;

    wI.oninput = (event: KeyboardEvent): void => {
      syncInputs();
      w.scrollTop = w.scrollHeight;
    };

    wI.onkeydown = (event: KeyboardEvent): void => {
      if (event.key == "Enter") {
        commandManager(config.id, wI.value.trim());
        w.scrollTop = w.scrollHeight;
        wI.value = "";
      } else {
        syncInputs();
      }
    };

    wI.onfocus = setCursor;
    wI.onclick = setCursor;

    wC = document.createElement("label");
    wC.htmlFor = `${config.id}__input`;
  } else {
    wC = document.createElement("div");
  }

  wC.classList.add("window-container");
  wC.tabIndex = 0;
  wC.style.left = `${posX}px`;
  wC.style.top = `${posY}px`;
  wC.id = config.id;
  wC.style.zIndex = String(globalIncrement);
  wC.style.width = `${realWidth + _windowPaddingX - 2}px`;

  wO.append(w);
  wC.append(wH, wO);
  document.body.append(wC);

  if (config.typeable !== false) {
    wC.append(wI);
    wI.focus();
  } else {
    wC.focus();
  }

  WINDOWS[config.id] = {
    element: wC,
    height: realHeight,
    width: realWidth,
    posX: posX,
    posY: posY,
    fullscreen: false,
    zIndex: globalIncrement,
    vars: {}
  };

  function mouseMoveEvent(x: number, y: number): void {
    WINDOWS[config.id].posX = Math.max(0, Math.min(innerWidth - WINDOWS[config.id].width - _windowPaddingX, x - WINDOWS[config.id].vars.mouseOffsetX));
    WINDOWS[config.id].posY = Math.max(0, Math.min(innerHeight - WINDOWS[config.id].height - _windowPaddingY, y - WINDOWS[config.id].vars.mouseOffsetY));
    wC.style.left = `${WINDOWS[config.id].posX}px`;
    wC.style.top = `${WINDOWS[config.id].posY}px`;
  }

  // wC.addEventListener("mousedown", function(): void { incrementZIndex(config.id); });
  wC.addEventListener("focus", function(): void { incrementZIndex(config.id); });

  for (const link of wC.querySelectorAll("a")) {
    link.addEventListener("focus", function(): void { incrementZIndex(config.id); });
  }

  wH.addEventListener("mousedown", function(e: MouseEvent): void {
    if ((e.target as HTMLElement).dataset.noMove !== undefined) {
      return;
    }

    WINDOWS[config.id].vars.mouseOffsetX = e.clientX - WINDOWS[config.id].posX;
    WINDOWS[config.id].vars.mouseOffsetY = e.clientY - WINDOWS[config.id].posY;
    MOUSE_MOVE_PROCESSING[config.id] = {
      callback: mouseMoveEvent,
      mouseUp: true
    };
  });

  wH.querySelector(".close").addEventListener("click", function(): void {
    delete WINDOWS[config.id];
    delete windowInformation[config.id];
    delete MOUSE_MOVE_PROCESSING[config.id];
    wC.remove();

    if (typeof config.onDestroy === "function") {
      config.onDestroy();
    }
  });

  wH.querySelector(".fullscreen").addEventListener("click", function(): void {
    if (WINDOWS[config.id].fullscreen) {
      WINDOWS[config.id].posX = WINDOWS[config.id].vars.oldPosX;
      WINDOWS[config.id].posY = WINDOWS[config.id].vars.oldPosY;
      WINDOWS[config.id].width = WINDOWS[config.id].vars.oldWidth;
      WINDOWS[config.id].height = WINDOWS[config.id].vars.oldHeight;
      WINDOWS[config.id].fullscreen = false;
      delete WINDOWS[config.id].vars.oldPosX;
      delete WINDOWS[config.id].vars.oldPosY;
      delete WINDOWS[config.id].vars.oldWidth;
      delete WINDOWS[config.id].vars.oldHeight;
      wC.style.left = `${WINDOWS[config.id].posX}px`;
      wC.style.top = `${WINDOWS[config.id].posY}px`;
      wC.style.width = `${WINDOWS[config.id].width + _windowPaddingX - 2}px`;
      w.style.width = `${WINDOWS[config.id].width}px`;
      w.style.height = `${WINDOWS[config.id].height}px`;
    } else {
      WINDOWS[config.id].vars.oldPosX = WINDOWS[config.id].posX;
      WINDOWS[config.id].vars.oldPosY = WINDOWS[config.id].posY;
      WINDOWS[config.id].vars.oldWidth = WINDOWS[config.id].width;
      WINDOWS[config.id].vars.oldHeight = WINDOWS[config.id].height;
      WINDOWS[config.id].fullscreen = true;
      WINDOWS[config.id].posX = 0;
      WINDOWS[config.id].posY = 0;
      WINDOWS[config.id].width = innerWidth;
      WINDOWS[config.id].height = innerHeight;
      wC.style.left = "0px";
      wC.style.top = "0px";
      wC.style.width = `${WINDOWS[config.id].width}px`;
      w.style.width = `${WINDOWS[config.id].width - _windowPaddingX}px`;
      w.style.height = `${WINDOWS[config.id].height - _windowPaddingY}px`;
    }
  });

  globalIncrement++;
}

window.addEventListener("mousemove", function(e: MouseEvent): void {
  for (const key of Object.keys(MOUSE_MOVE_PROCESSING)) {
    MOUSE_MOVE_PROCESSING[key].callback(e.clientX, e.clientY);
  }
});

window.addEventListener("mouseup", function(): void {
  for (const key of Object.keys(MOUSE_MOVE_PROCESSING)) {
    if (MOUSE_MOVE_PROCESSING[key].mouseUp) {
      delete MOUSE_MOVE_PROCESSING[key];
    };
  }
});

function windowPreset(template: string): void {
  let el: HTMLElement = document.querySelector(`#window-templates > [data-template-id="${template}"]`);

  if (!el) { return; }

  if (WINDOWS[template]) {
    incrementZIndex(template, true);
    return;
  }

  let config: _winInitConf = {
    id: template,
    title: "~ - tSh",
    content: "<div><b class=\"green\">trinkey@website</b>:<b class=\"blue\">~</b>$&nbsp;<span data-type-area><i class=\"cursor\">&nbsp;</i></span></div>"
  };

  for (const field of el.querySelectorAll("[data-template-field]")) {
    config[(field as HTMLElement).dataset.templateField] = (field as HTMLElement).dataset.isNumber === "" ? +(field as HTMLElement).innerText : (field as HTMLElement).innerHTML;
  }

  createWindow(config);

  for (const command of el.querySelectorAll("li")) {
    WINDOWS[template].element.querySelector("[data-type-area]").innerHTML = command.innerHTML;
    commandManager(template, command.innerHTML);
  }
}

function copyButton(): void {
  navigator.clipboard.writeText("<a href=\"https://trinkey.com/\" target=\"_blank\"><img src=\"https://trinkey.com/img/88x31.png\" alt=\"trinkey's 88x31. image of her cat on the right with the word 'trinkey' taking up the rest of the button.\" title=\"trinkey's 88x31. image of her cat on the right with the word 'trinkey' taking up the rest of the button.\"></a>");
}