import { Component } from /**/"./Component.js";
let Toolkit;



///////////////////////////////////////////////////////////////////////////////
//                                  TextBox                                  //
///////////////////////////////////////////////////////////////////////////////

// Text entry field
class TextBox extends Component {
    static Component = Component;

    ///////////////////////// Initialization Methods //////////////////////////

    constructor(gui, options) {
        super(gui, options, {
            className: "tk tk-textbox",
            tagName  : "input"
        });
        this.element.type = "text";
        this.setAttribute("spellcheck", "false");

        // Configure instance fields
        this.isEnabled = null;
        this.maxLength = null;
        this.pattern   = null;

        // Configure component
        options = options || {};
        this.setEnabled(!("enabled" in options) || options.enabled);
        if ("maxLength" in options)
            this.setMaxLength(options.maxLength);
        if ("pattern" in options)
            this.setPattern(options.pattern);
        this.setText   (options.text);

        // Configure event handlers
        this.addEventListener("blur"       , e=>this.commit      ( ));
        this.addEventListener("pointerdown", e=>e.stopPropagation( ));
        this.addEventListener("keydown"    , e=>this.onKeyDown   (e));
    }



    ///////////////////////////// Event Handlers //////////////////////////////

    // Key press
    onKeyDown(e) {

        // Processing by key
        switch (e.key) {
            case "ArrowLeft":
            case "ArrowRight":
                e.stopPropagation();
                return;
            case "Enter":
                this.commit();
                break;
            default: return;
        }

        // Configure event
        e.stopPropagation();
        e.preventDefault();
    }



    ///////////////////////////// Public Methods //////////////////////////////

    // Programmatically commit the text box
    commit() {
        this.event("action");
    }

    // Retrieve the control's value
    getText() {
        return this.element.value;
    }

    // Specify whether the button can be activated
    setEnabled(enabled) {
        this.isEnabled = enabled = !!enabled;
        this.setAttribute("disabled", enabled ? null : "true");
    }

    // Specify the maximum length of the text
    setMaxLength(length) {

        // Remove limitation
        if (length === null) {
            this.maxLength = null;
            this.setAttribute("maxlength", null);
            return;
        }

        // Error checking
        if (typeof length != "number" || isNaN(length))
            return;

        // Range checking
        length = Math.floor(length);
        if (length < 0)
            return;

        // Configure component
        this.maxLength = length;
        this.setAttribute("maxlength", length);
    }

    // Specify a regex pattern for valid text characters
    setPattern(pattern) {
        /*
        Disabled because user agents may not prevent invalid input

        // Error checking
        if (pattern && typeof pattern != "string")
            return;

        // Configure component
        this.pattern = pattern = pattern || null;
        this.setAttribute("pattern", pattern);
        */
    }

    // Specify the widget's display text
    setText(text = "") {
        this.element.value = text.toString();
    }



    ///////////////////////////// Package Methods /////////////////////////////

    // Update the global Toolkit object
    static setToolkit(toolkit) {
        Toolkit = toolkit;
    }

}



export { TextBox };