class PdfActionsManager {
  pageDirection;
  pagesContainer;

  constructor(id) {
    this.pagesContainer = document.getElementById(id);
    this.pageDirection = document.documentElement.getAttribute("dir");

    var styleElement = document.createElement("link");
    styleElement.rel = "stylesheet";
    styleElement.href = "css/pdfActions.css";

    document.head.appendChild(styleElement);
  }

  getPageContainer(element) {
    var container = element;
    while (!container.classList.contains("page-container")) {
      container = container.parentNode;
    }
    return container;
  }

  moveUpButtonCallback(e) {
    var imgContainer = this.getPageContainer(e.target);

    const sibling = imgContainer.previousSibling;
    if (sibling) {
      this.movePageTo(imgContainer, sibling, true);
    }
  }

  moveDownButtonCallback(e) {
    var imgContainer = this.getPageContainer(e.target);
    const sibling = imgContainer.nextSibling;
    if (sibling) {
      this.movePageTo(imgContainer, sibling.nextSibling, true);
    }
  }

  rotateCCWButtonCallback(e) {
    var imgContainer = this.getPageContainer(e.target);
    const img = imgContainer.querySelector("img");

    this.rotateElement(img, -90);
  }

  rotateCWButtonCallback(e) {
    var imgContainer = this.getPageContainer(e.target);
    const img = imgContainer.querySelector("img");

    this.rotateElement(img, 90);
  }

  deletePageButtonCallback(e) {
    var imgContainer = this.getPageContainer(e.target);
    this.pagesContainer.removeChild(imgContainer);
    if (this.pagesContainer.childElementCount === 0) {
      const filenameInput = document.getElementById("filename-input");
      const filenameParagraph = document.getElementById("filename");
      const downloadBtn = document.getElementById("export-button");

      filenameInput.disabled = true;
      filenameInput.value = "";
      filenameParagraph.innerText = "";

      downloadBtn.disabled = true;
    }
  }

  insertFileButtonCallback(e) {
    var imgContainer = this.getPageContainer(e.target);
    this.addPdfs(imgContainer);
  }

  setActions({ movePageTo, addPdfs, rotateElement }) {
    this.movePageTo = movePageTo;
    this.addPdfs = addPdfs;
    this.rotateElement = rotateElement;

    this.moveUpButtonCallback = this.moveUpButtonCallback.bind(this);
    this.moveDownButtonCallback = this.moveDownButtonCallback.bind(this);
    this.rotateCCWButtonCallback = this.rotateCCWButtonCallback.bind(this);
    this.rotateCWButtonCallback = this.rotateCWButtonCallback.bind(this);
    this.deletePageButtonCallback = this.deletePageButtonCallback.bind(this);
    this.insertFileButtonCallback = this.insertFileButtonCallback.bind(this);
  }

  adapt(div) {
    div.classList.add("pdf-actions_container");
    const leftDirection = this.pageDirection === "rtl" ? "right" : "left";
    const rightDirection = this.pageDirection === "rtl" ? "left" : "right";
    const buttonContainer = document.createElement("div");

    buttonContainer.classList.add("pdf-actions_button-container", "hide-on-drag");

    const moveUp = document.createElement("button");
    moveUp.classList.add("pdf-actions_move-left-button", "btn", "btn-secondary");
    moveUp.innerHTML = `<i class="bi bi-arrow-${leftDirection}-short"></i>`;
    moveUp.onclick = this.moveUpButtonCallback;
    buttonContainer.appendChild(moveUp);

    const moveDown = document.createElement("button");
    moveDown.classList.add("pdf-actions_move-right-button", "btn", "btn-secondary");
    moveDown.innerHTML = `<i class="bi bi-arrow-${rightDirection}-short"></i>`;
    moveDown.onclick = this.moveDownButtonCallback;
    buttonContainer.appendChild(moveDown);

    const rotateCCW = document.createElement("button");
    rotateCCW.classList.add("btn", "btn-secondary");
    rotateCCW.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-counterclockwise" viewBox="0 0 16 16">
                            <path fill-rule="evenodd" d="M8 3a5 5 0 1 1-4.546 2.914.5.5 0 0 0-.908-.417A6 6 0 1 0 8 2v1z" />
                            <path d="M8 4.466V.534a.25.25 0 0 0-.41-.192L5.23 2.308a.25.25 0 0 0 0 .384l2.36 1.966A.25.25 0 0 0 8 4.466z" />
                        </svg>`;
    rotateCCW.onclick = this.rotateCCWButtonCallback;
    buttonContainer.appendChild(rotateCCW);

    const rotateCW = document.createElement("button");
    rotateCW.classList.add("btn", "btn-secondary");
    rotateCW.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-clockwise" viewBox="0 0 16 16">
                            <path fill-rule="evenodd" d="M8 3a5 5 0 1 0 4.546 2.914.5.5 0 0 1 .908-.417A6 6 0 1 1 8 2v1z" />
                            <path d="M8 4.466V.534a.25.25 0 0 1 .41-.192l2.36 1.966c.12.1.12.284 0 .384L8.41 4.658A.25.25 0 0 1 8 4.466z" />
                        </svg>`;
    rotateCW.onclick = this.rotateCWButtonCallback;
    buttonContainer.appendChild(rotateCW);

    const deletePage = document.createElement("button");
    deletePage.classList.add("btn", "btn-danger");
    deletePage.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-trash" viewBox="0 0 16 16">
                            <path d="M5.5 5.5A.5.5 0 0 1 6 6v6a.5.5 0 0 1-1 0V6a.5.5 0 0 1 .5-.5Zm2.5 0a.5.5 0 0 1 .5.5v6a.5.5 0 0 1-1 0V6a.5.5 0 0 1 .5-.5Zm3 .5a.5.5 0 0 0-1 0v6a.5.5 0 0 0 1 0V6Z"/>
                            <path d="M14.5 3a1 1 0 0 1-1 1H13v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V4h-.5a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1H6a1 1 0 0 1 1-1h2a1 1 0 0 1 1 1h3.5a1 1 0 0 1 1 1v1ZM4.118 4 4 4.059V13a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1V4.059L11.882 4H4.118ZM2.5 3h11V2h-11v1Z"/>
                        </svg>`;
    deletePage.onclick = this.deletePageButtonCallback;
    buttonContainer.appendChild(deletePage);

    div.appendChild(buttonContainer);

    const insertFileButtonContainer = document.createElement("div");

    insertFileButtonContainer.classList.add(
      "pdf-actions_insert-file-button-container",
      leftDirection,
      `align-center-${leftDirection}`,
    );

    const insertFileButton = document.createElement("button");
    insertFileButton.classList.add("btn", "btn-primary", "pdf-actions_insert-file-button");
    insertFileButton.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-file-earmark-plus" viewBox="0 0 16 16">
                                <path d="M8 6.5a.5.5 0 0 1 .5.5v1.5H10a.5.5 0 0 1 0 1H8.5V11a.5.5 0 0 1-1 0V9.5H6a.5.5 0 0 1 0-1h1.5V7a.5.5 0 0 1 .5-.5z"/>
                                <path d="M14 4.5V14a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V2a2 2 0 0 1 2-2h5.5L14 4.5zm-3 0A1.5 1.5 0 0 1 9.5 3V1H4a1 1 0 0 0-1 1v12a1 1 0 0 0 1 1h8a1 1 0 0 0 1-1V4.5h-2z"/>
                            </svg>`;
    insertFileButton.onclick = this.insertFileButtonCallback;
    insertFileButtonContainer.appendChild(insertFileButton);

    div.appendChild(insertFileButtonContainer);

    // add this button to every element, but only show it on the last one :D
    const insertFileButtonRightContainer = document.createElement("div");
    insertFileButtonRightContainer.classList.add(
      "pdf-actions_insert-file-button-container",
      rightDirection,
      `align-center-${rightDirection}`,
    );

    const insertFileButtonRight = document.createElement("button");
    insertFileButtonRight.classList.add("btn", "btn-primary", "pdf-actions_insert-file-button");
    insertFileButtonRight.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-file-earmark-plus" viewBox="0 0 16 16">
                                <path d="M8 6.5a.5.5 0 0 1 .5.5v1.5H10a.5.5 0 0 1 0 1H8.5V11a.5.5 0 0 1-1 0V9.5H6a.5.5 0 0 1 0-1h1.5V7a.5.5 0 0 1 .5-.5z"/>
                                <path d="M14 4.5V14a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V2a2 2 0 0 1 2-2h5.5L14 4.5zm-3 0A1.5 1.5 0 0 1 9.5 3V1H4a1 1 0 0 0-1 1v12a1 1 0 0 0 1 1h8a1 1 0 0 0 1-1V4.5h-2z"/>
                                insertFileButtonRight</svg>`;
    insertFileButtonRight.onclick = () => addPdfs();
    insertFileButtonRightContainer.appendChild(insertFileButtonRight);

    div.appendChild(insertFileButtonRightContainer);

    const adaptPageNumber = (pageNumber, div) => {
      const pageNumberElement = document.createElement("span");
      pageNumberElement.classList.add("page-number");
      pageNumberElement.textContent = pageNumber;

      div.insertBefore(pageNumberElement, div.firstChild);
    };

    div.addEventListener("mouseenter", () => {
      const pageNumber = Array.from(div.parentNode.children).indexOf(div) + 1;
      adaptPageNumber(pageNumber, div);
    });

    div.addEventListener("mouseleave", () => {
      const pageNumberElement = div.querySelector(".page-number");
      if (pageNumberElement) {
        div.removeChild(pageNumberElement);
      }
    });

    return div;
  }
}

export default PdfActionsManager;
