/**
 * Original source: https://www.w3schools.com/howto/howto_css_modals.asp
 *
 * @requires modal.css
 *
 * Converted to a class by
 * @author   Ikaros Kappler
 * @date     2020-09-14
 * @modified 2023-08-09 Ported to typescript.
 * @version  1.1.0
 **/

/*
      <!-- The Modal -->
      <div id="myModal" class="modal">

      <!-- Modal content -->
      <div class="modal-content">
      <div class="modal-header">
      <span class="close">&times;</span>
      <h2>Modal Header</h2>
      </div>
      <div class="modal-body">
      <p>Some text in the Modal Body</p>
      <p>Some other text...</p>
      </div>
      <div class="modal-footer">
      <h3>Modal Footer</h3>
      </div>
      </div>

      </div>
    */

export interface IModalAction {
  label: string;
  action: string | (() => void);
}

interface IModalStruct {
  modal: {
    id: string;
    parent: HTMLDivElement;
    header: {
      closeBtn: HTMLSpanElement;
      content: HTMLHeadingElement;
    };
    body: { content: HTMLDivElement };
    footer: {
      content: HTMLHeadingElement;
      actions: HTMLDivElement;
    };
  };
}

export class Modal {
  static ACTION_CLOSE: IModalAction = { label: "Close", action: "close" };
  static ACTION_CANCEL: IModalAction = { label: "Cancel", action: "close" };
  static ACTION_OK: IModalAction = { label: "OK", action: "close" };

  private static MODAL_COUNTER: number = 0;
  private modalElements;

  constructor() {
    this.modalElements = this.buildDOMNode("myModal-" + Modal.MODAL_COUNTER++);
  }

  setTitle(title: string) {
    this.modalElements.modal.header.content.innerHTML = title;
  }

  setBody(bodyContent: HTMLElement | string) {
    if (Modal.isDOMNode(bodyContent)) {
      Modal.removeChildNodes(this.modalElements.modal.body.content);
      this.modalElements.modal.body.content.append(bodyContent);
    } else {
      this.modalElements.modal.body.content.innerHTML = bodyContent;
    }
  }

  setFooter(title: string) {
    if (typeof title === "string") {
      this.modalElements.modal.footer.content.innerHTML = title.length == 0 ? "&nbsp;" : title;
    } else {
      console.log("Footer elements?");
    }
  }

  setActions(actions: Array<IModalAction>) {
    const _self = this;
    Modal.removeChildNodes(this.modalElements.modal.footer.actions);
    if (Array.isArray(actions)) {
      for (var i in actions) {
        const a: IModalAction = actions[i];
        var cmd: string | null = null;
        const btn = document.createElement("button");
        btn.innerHTML = a.label;
        if (typeof a.action === "function") {
          btn.addEventListener("click", a.action);
        } else if ((typeof a === "string" && (cmd = a) != null) || (typeof a.action === "string" && (cmd = a.action) != null)) {
          if (cmd === "cancel" || cmd === "ok" || cmd === "close")
            btn.addEventListener("click", () => {
              _self.close();
            });
        }
        this.modalElements.modal.footer.actions.appendChild(btn);
      }
    }
  }

  close() {
    this.modalElements.modal.parent.classList.remove("modal-opened");
    this.modalElements.modal.parent.classList.add("modal-closed");
  }

  open() {
    this.modalElements.modal.parent.classList.remove("modal-closed");
    this.modalElements.modal.parent.classList.add("modal-opened");
  }

  private buildDOMNode(id: string): IModalStruct {
    var _self = this;

    var modal = document.createElement("div");
    modal.setAttribute("id", id);
    modal.classList.add("modal");
    modal.classList.add("modal-closed");

    var content = document.createElement("div");
    content.classList.add("modal-content");

    var header = document.createElement("div");
    header.classList.add("modal-header");

    var closeBtn = document.createElement("span");
    closeBtn.classList.add("modal-close");
    closeBtn.innerHTML = "&times;";

    var h2 = document.createElement("h2");
    h2.innerHTML = "Modal Header";

    var body = document.createElement("div");
    body.classList.add("modal-body");

    // Body contents?
    var bodyContent = document.createElement("p");
    bodyContent.innerHTML = "Some text in the Modal Body";

    var footer = document.createElement("div");
    footer.classList.add("modal-footer");

    var footerContent = document.createElement("h3");
    var footerActions = document.createElement("div");
    footerContent.innerHTML = "Modal Footer";
    footerActions.classList.add("modal-actions");
    footer.appendChild(footerContent);
    footer.appendChild(footerActions);

    header.appendChild(closeBtn);
    header.appendChild(h2);
    content.appendChild(header);
    body.appendChild(bodyContent);
    content.appendChild(body);
    content.appendChild(footer);
    modal.appendChild(content);

    // When the user clicks on <span> (x), close the modal
    closeBtn.onclick = () => {
      _self.close();
    };

    // Append new modal to body
    document.getElementsByTagName("body")[0].appendChild(modal);

    return {
      modal: {
        id: id,
        parent: modal,
        header: {
          closeBtn: closeBtn,
          content: h2
        },
        body: { content: bodyContent },
        footer: {
          content: footerContent,
          actions: footerActions
        }
      }
    };
  }

  // https://stackoverflow.com/questions/384286/how-do-you-check-if-a-javascript-object-is-a-dom-object
  static isDOMNode(obj) {
    try {
      //Using W3 DOM2 (works for FF, Opera and Chrome)
      return obj instanceof HTMLElement;
    } catch (e) {
      //Browsers not supporting W3 DOM2 don't have HTMLElement and
      //an exception is thrown and we end up here. Testing some
      //properties that all elements have (works on IE7)
      return (
        typeof obj === "object" && obj.nodeType === 1 && typeof obj.style === "object" && typeof obj.ownerDocument === "object"
      );
    }
  }

  static removeChildNodes = node => {
    // Remove all current actions
    while (node.firstChild) {
      node.removeChild(node.lastChild);
    }
  };
}