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

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 edgeMoveEvent(x: number, y: number, pos: "top" | "bottom" | "left" | "right" | "top-left" | "top-right" | "bottom-left" | "bottom-right" | string, windowID: string): void {
  let w: _winConf = WINDOWS[windowID];

  if (w.fullscreen) { return; }

  if (pos == "top" || pos.startsWith("top-")) {
    w.height = Math.max(-(y - w.vars.mouseOffsetY - w.vars.startingPosY) + w.vars.startingHeight, w.minHeight);
    w.posY = Math.max(w.vars.startingHeight - w.height + w.vars.startingPosY, 0);

    if (w.posY < 0) {
      w.height -= w.posY;
      w.posY = 0;
    }
  } else if (pos == "bottom" || pos.startsWith("bottom-")) {
    w.height = Math.max(y - w.vars.mouseOffsetY - w.vars.startingPosY + w.vars.startingHeight, w.minHeight);
  }

  if (pos == "left" || pos.endsWith("-left")) {
    w.width = Math.max(-(x - w.vars.mouseOffsetX - w.vars.startingPosX) + w.vars.startingWidth, w.minWidth);
    w.posX = Math.max(w.vars.startingWidth - w.width + w.vars.startingPosX, 0);

    if (w.posX < 0) {
      w.width -= w.posX;
      w.posX = 0;
    }
  } else if (pos == "right" || pos.endsWith("-right")) {
    w.width = Math.max(x - w.vars.mouseOffsetX - w.vars.startingPosX + w.vars.startingWidth, w.minWidth);
  }

  if (w.posX + w.width  + _windowPaddingX > innerWidth ) { w.width  = Math.max(innerWidth  - w.posX - _windowPaddingX, w.minWidth);  }
  if (w.posY + w.height + _windowPaddingY > innerHeight) { w.height = Math.max(innerHeight - w.posY - _windowPaddingY, w.minHeight); }

  w.element.style.left = `${w.posX}px`;
  w.element.style.top  = `${w.posY}px`;

  w.element.style.width = `${w.width + _windowPaddingX - 2}px`;
  (w.element.querySelector(".window") as HTMLElement).style.width  = `${w.width }px`;
  (w.element.querySelector(".window") as HTMLElement).style.height = `${w.height}px`;
}

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

function syncInputs(windowID: string): void {
  let windowInput: HTMLInputElement = WINDOWS[windowID].element.querySelector("input.window-input");
  let windowVisualText: HTMLDivElement = WINDOWS[windowID].element.querySelector("[data-type-area]");
  let w: HTMLDivElement = WINDOWS[windowID].element.querySelector(".window");

  if (!windowVisualText) { return; }

  setTimeout(function(): void {
    let text: string = windowInput.value;
    let cursor: number = windowInput.selectionStart;

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

  w.scrollTop = w.scrollHeight;
}

function setCursor(windowID: string): void {
  let windowInput: HTMLInputElement = WINDOWS[windowID].element.querySelector("input.window-input");

  setTimeout((): void => {
    windowInput.setSelectionRange(windowInput.value.length, windowInput.value.length);
    syncInputs(windowID);
  }, 1);
}

function toggleFullscreen(windowID: string): void {
  let w: _winConf = WINDOWS[windowID];
  if (w.fullscreen) {
    w.posX = Math.max(0, Math.min(innerWidth - w.vars.oldWidth - _windowPaddingX, w.vars.oldPosX)); // window.vars.oldPosX;
    w.posY = Math.max(0, Math.min(innerHeight - w.vars.oldHeight - _windowPaddingY, w.vars.oldPosY)); // window.vars.oldPosY;
    w.width = Math.max(w.minWidth,  Math.min(w.vars.oldWidth,  innerWidth  - _windowPaddingX)); // window.vars.oldWidth;
    w.height = Math.max(w.minHeight, Math.min(w.vars.oldHeight, innerHeight - _windowPaddingY)); // window.vars.oldHeight;
    w.fullscreen = false;
    delete w.vars.oldPosX;
    delete w.vars.oldPosY;
    delete w.vars.oldWidth;
    delete w.vars.oldHeight;
    w.element.style.left = `${w.posX}px`;
    w.element.style.top = `${w.posY}px`;
    w.element.style.width = `${w.width + _windowPaddingX - 2}px`;
    (w.element.querySelector(".window") as HTMLElement).style.width = `${w.width}px`;
    (w.element.querySelector(".window") as HTMLElement).style.height = `${w.height}px`;
  } else {
    w.vars.oldPosX = w.posX;
    w.vars.oldPosY = w.posY;
    w.vars.oldWidth = w.width;
    w.vars.oldHeight = w.height;
    w.fullscreen = true;
    w.posX = 0;
    w.posY = 0;
    w.width = innerWidth;
    w.height = innerHeight;
    w.element.style.left = "0px";
    w.element.style.top = "0px";
    w.element.style.width = `${w.width}px`;
    (w.element.querySelector(".window") as HTMLElement).style.width = `${w.width - _windowPaddingX}px`;
    (w.element.querySelector(".window") as HTMLElement).style.height = `${w.height - _windowPaddingY}px`;
  }
}

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

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

    wI.oninput = (event: KeyboardEvent): void => {
      syncInputs(config.id);
      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 if (event.key == "Tab") {
        event.preventDefault();

        let val: string = wI.value.trim();
        let possibilities: string[] = [];
        let parent: _file | null;

        if (!val) { return; }

        if (val.split(" ").length == 1 && wI.value[wI.value.length - 1] != " ") {
          possibilities = Object.keys(_internal_commands).filter((cmd: string): boolean => (cmd.startsWith(val) && !cmd.startsWith("_")));
        } else if (_internal_commands[val.split(" ")[0]] && _internal_commands[val.split(" ")[0]].autocomplete) {
          let ac: "dir" | "file" | string[] = _internal_commands[val.split(" ")[0]].autocomplete;
          let path: string = val.split(" ").slice(1).join(" ").trim();
          let sw: string = path.split("/")[path.split("/").length - 1];

          if (typeof ac == "object") {
            possibilities = ac;
          } else {
            if (path) {
              if (path[path.length - 1] == "/") {
                parent = _internal_getFile(_internal_sanitizePath(_internal_joinPaths(windowInformation[config.id].PWD, path)));
              } else {
                parent = _internal_getFile(_internal_sanitizePath(_internal_joinPaths(windowInformation[config.id].PWD, path + "/..")));
              }
            } else {
              parent = _internal_getFile(windowInformation[config.id].PWD);
            }

            if (parent && parent.type == "directory") {
              let f: _files = parent.files;
              possibilities = Object.keys(f);

              if (ac == "dir") {
                possibilities = possibilities.filter((file: string): boolean => (f[file] && f[file].type == "directory"));
              }
            } else {
              parent = null;
            }
          }

          possibilities = possibilities.filter((v: string): boolean => v.startsWith(sw));
        }

        if (possibilities.length == 1) {
          if (val.split(" ").length == 1 && wI.value[wI.value.length - 1] != " ") {
            wI.value = possibilities[0] + " ";
          } else if (_internal_commands[val.split(" ")[0]] && _internal_commands[val.split(" ")[0]].autocomplete) {
            let path: string = val;

            if (val[val.length - 1] == "/") {
              path += possibilities[0];
            } else {
              let p: string[] = path.split("/");

              if (p.length == 1) {
                p = p[0].split(" ", 2);

                if (p.length == 1) {
                  p.push("");
                }

                p.pop();
                path = p.join(" ") + " " + possibilities[0];
              } else {
                p.pop();
                path = p.join("/") + "/" + possibilities[0];
              }
            }

            wI.value = path + (parent && parent.type == "directory" && parent.files[possibilities[0]].type == "directory" ? "/" : " ");
          }

          syncInputs(config.id);
        } else if (possibilities) {
          addWindowCommand(config.id, possibilities.join(" "));
          syncInputs(config.id);
        }
      } else {
        syncInputs(config.id);
      }
    };

    wI.onfocus = (): void => { setCursor(config.id); };
    wI.onclick = (): void => { setCursor(config.id); };

    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`;

  let edges: DocumentFragment = document.createDocumentFragment();
  for (const pos of ["top", "bottom", "left", "right", "top-left", "top-right", "bottom-left", "bottom-right"]) {
    let el: HTMLDivElement = document.createElement("div");
    el.classList.add("edge", pos);
    el.addEventListener("mousedown", function(e: MouseEvent): void {
      incrementZIndex(config.id);
      e.preventDefault();

      WINDOWS[config.id].vars.mouseOffsetX = e.clientX - WINDOWS[config.id].posX;
      WINDOWS[config.id].vars.mouseOffsetY = e.clientY - WINDOWS[config.id].posY;
      WINDOWS[config.id].vars.startingWidth  = WINDOWS[config.id].width;
      WINDOWS[config.id].vars.startingHeight = WINDOWS[config.id].height;
      WINDOWS[config.id].vars.startingPosX = WINDOWS[config.id].posX;
      WINDOWS[config.id].vars.startingPosY = WINDOWS[config.id].posY;
      MOUSE_MOVE_PROCESSING[config.id] = {
        callback: (x: number, y: number): void => { edgeMoveEvent(x, y, pos, config.id); },
        mouseUp: true
      };
    });

    edges.append(el);
  }

  wO.append(w);
  wC.append(wH, wO, edges);
  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,
    minHeight: config.minHeight,
    minWidth: config.minWidth,
    posX: posX,
    posY: posY,
    fullscreen: false,
    zIndex: globalIncrement,
    vars: {}
  };

  windowInformation[config.id] = {
    PWD: HOME_DIR
  };

  // 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: (x: number, y: number): void => { mouseMoveEvent(config.id, x, y); },
      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", (): void => (toggleFullscreen(config.id)));
  wH.addEventListener("dblclick", (): void => (toggleFullscreen(config.id)));

  globalIncrement++;
}

function windowPreset(template: string, dontDisableTyping: boolean=false): 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);
  }

  if (!dontDisableTyping) {
    WINDOWS[template].element.querySelector("input").remove();
  }
}

function emptyWindow(): void {
  createWindow({
    id: `terminal-${Math.random()}`,
    title: "~ - tSh",
    content: "<div><b class=\"green\">trinkey@website</b>:<b class=\"blue\">~</b>$&nbsp;<span data-type-area><i class=\"cursor\">&nbsp;</i></span></div>"
  });
}

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>");
}

onmousemove = function(e: MouseEvent): void {
  e.preventDefault();

  for (const key of Object.keys(MOUSE_MOVE_PROCESSING)) {
    MOUSE_MOVE_PROCESSING[key].callback(e.clientX, e.clientY);
  }
}

onmouseup = function(): void {
  for (const key of Object.keys(MOUSE_MOVE_PROCESSING)) {
    if (MOUSE_MOVE_PROCESSING[key].mouseUp) {
      delete MOUSE_MOVE_PROCESSING[key];
    };
  }
}

onresize = function(): void {
  for (const window of Object.keys(WINDOWS)) {
    let w: _winConf = WINDOWS[window];

    if (w.fullscreen) {
      w.width = innerWidth - _windowPaddingX + 2;
      w.height = innerHeight - _windowPaddingY + 2;
    } else {
      w.posX = Math.max(0, Math.min(innerWidth  - w.width  - _windowPaddingX, w.posX));
      w.posY = Math.max(0, Math.min(innerHeight - w.height - _windowPaddingY, w.posY));

      w.width  = Math.max(w.minWidth,  Math.min(w.width,  innerWidth  - _windowPaddingX));
      w.height = Math.max(w.minHeight, Math.min(w.height, innerHeight - _windowPaddingY));
    }

    w.element.style.left = `${w.posX}px`;
    w.element.style.top  = `${w.posY}px`;
    w.element.style.width = `${w.width + _windowPaddingX - 2}px`;
    (w.element.querySelector(".window") as HTMLElement).style.width  = `${w.width }px`;
    (w.element.querySelector(".window") as HTMLElement).style.height = `${w.height}px`;
  }
}