/**
 * EGroupware eTemplate2 - Button widget
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package etemplate
 * @subpackage api
 * @link https://www.egroupware.org
 * @author Nathan Gray
 */


import BXButton from "../../../node_modules/carbon-web-components/es/components/button/button"
import {css} from "../../../node_modules/lit-element/lit-element.js";
import {Et2InputWidget} from "./et2_core_inputWidget";
import {Et2Widget} from "./et2_core_inheritance";

export class Et2Button extends Et2InputWidget(Et2Widget(BXButton))
{
    protected _created_icon_node: HTMLImageElement;
    protected clicked: boolean = false;

    static get properties() {
        return {
            image: {type: String},
            onclick: {type: Function}
        }
    }
    static get styles()
    {
        return [
            super.styles,
            css`
            /* Custom CSS - Needs to work with the LitElement we're extending */
            `
        ];
    }
    constructor()
    {
        super();

        // Property default values
        this.image = '';

        // Create icon Element since BXButton puts it as child, but we put it as attribute
        this._created_icon_node = document.createElement("img");
        this._created_icon_node.slot="icon";
        // Do not add this._icon here, no children can be added in constructor

        // Define a default click handler
        // If a different one gets set via attribute, it will be used instead
        this.onclick = (typeof this.onclick === "function") ? this.onclick : () => {
            debugger;
            this.getInstanceManager().submit();
        };
    }

    connectedCallback() {
        super.connectedCallback();

        this.classList.add("et2_button")

        if(this.image)
        {
            this._created_icon_node.src = egw.image(this.image);
            this.appendChild(this._created_icon_node);
        }

        this.addEventListener("click",this._handleClick.bind(this));
    }


    _handleClick(event: MouseEvent) : boolean
    {
        // ignore click on readonly button
        if (this.disabled) return false;

        this.clicked = true;

        // Cancel buttons don't trigger the close confirmation prompt
        if(this.classList.contains("et2_button_cancel"))
        {
            this.getInstanceManager()?.skip_close_prompt();
        }

        if (!super._handleClick(event))
        {
            this.clicked = false;
            return false;
        }

        this.clicked = false;
        this.getInstanceManager()?.skip_close_prompt(false);
        return true;
    }

    /**
     * Implementation of the et2_IInput interface
     */

    /**
     * Always return false as a button is never dirty
     */
    isDirty()
    {
        return false;
    }

    resetDirty()
    {
    }

    getValue()
    {
        if (this.clicked)
        {
            return true;
        }

        // If "null" is returned, the result is not added to the submitted
        // array.
        return null;
    }
}
customElements.define("et2-button",Et2Button);