um-cseg/chez-betty

/*
 * Handle all keyboard input on the terminal.
 * This means handle:
 * - MCards
 * - Barcode Scans
 * - Bill Acceptor inputs
 *
 */


// Global state
var keyboard_input = '';
var input_timer = null;


// This gets called when keyboard input stops.
function process_input () {
    // Keep a local copy so we can clear global in case anything goes wrong.
    var keyin = keyboard_input;
    keyboard_input = '';

    if (keyin.slice(0, 3) == "%B6") {
        // This looks like an M-Card
        var umid = keyin.slice(8, 16);

        // Ignore MCard input while the splash screen is live
        if ($('#splash').is(':visible')) {
            return;
        }

        window.location.replace("/terminal/" + umid);

    } else if ((keyin.length == 7 || keyin.length == 14) &&
               (keyin.slice(0, 4) == "BILL" || keyin.slice(0, 3) == "ILL")) {
        // This looks like the bill acceptor.
        // We handle either two separate messages (BEG and amount) or them
        // as one string.
        var dollars = keyin.slice(keyin.length-3, keyin.length);

        if (dollars == 'BEG') {
            start_deposit();
        } else {
            // Call the main code to actually handle this
            handle_deposit(parseInt(dollars), 'acceptor');
        }

    } else {
        // Well, this must be a barcode scan
        if (keyin.length > 1) {
            var barcode = keyin.slice(0, keyin.length-1);
            add_item(barcode);
        }
    }
}



// Called on each keypress
$(document).keypress(function (e) {
    // Hide any notifications from any previous actions.
    alert_clear();

    // Reset the timeout timer
    if (input_timer) {
        clearTimeout(input_timer);
    }
    // Start a new timeout in case this is the last keypress
    input_timer = setTimeout(process_input, 500);

    // Save the character we just got
    keyboard_input += String.fromCharCode(e.which);
});