<?php

function my_excel_permission()
{
    return array(
        'Use Excel API' => array(
            'title' => t('Use Excel API'),
            'description' => t(''),
        ),
    );
}

function my_excel_menu()
{
    $items = array();

    $items['excel/generate-key'] = array(
        'title' => t('Generate a key for Excel'), //page title
        'description' => 'A form to mess around with.',
        'page callback' => 'my_excel_custompage',
        'page arguments' => array(),
        'access arguments' => array('Use Excel API'),
        'type' => MENU_NORMAL_ITEM,
    );

    return $items;
}

function my_excel_custompage()
{
    return theme('my_excel_custom_page_template');
}

function mybs_theme()
{
    return array(
        'my_excel_custom_page_template' => array(
            'template' => 'my-excel',
            'arguments' => array(),
        ),
    );
}

function my_excel_form($form, &$form_state)
{

    $form = array();
    // Blank output field which we will fill using AJAX.
    $form['output'] = array(
        '#prefix' => '<div id="output">' . t('Your key here..'),
        '#suffix' => '</div><div class="info amiri">' . t('Copy & Paste inside Excel\'s SMS Sender > Settings.') . '</div>',
        '#markup' => '',
    );

    // AJAX-enabled submit button.
    $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Generate an Excel Key'),
        '#prefix' => '<div id="gen">',
        '#suffix' => '</div>',
        '#ajax' => array(
            'callback' => 'my_excel_form_ajax_callback',
            'effect' => 'fade',
        ),
        '#attached' => array(
            'js' => array(
                drupal_get_path('module', 'my_excel') . '/my_excel.js' => array(
                    'type' => 'file',
                ),
            ),
            'css' => array(
                drupal_get_path('module', 'my_excel') . '/my_excel.css' => array(
                    'type' => 'file',
                ),
            ),
        ),
    );

    return $form;
}

/**
 * AJAX callback function for mymodule_form().
 */
function my_excel_form_ajax_callback($form, &$form_state)
{
    global $user;
    $user_id = $user->uid;
    $mi_nokkel = my_excel_create_api_key($user_id);

    return array(
        '#type' => 'ajax',
        '#commands' => array(
            'command' => 'special_effects',
            ajax_command_replace("#output", render($form['output']['value'] = "<div id='output'>" . $mi_nokkel . "</div>")),
            ajax_command_invoke(null, "myJavascriptFunction", array($myCustomParameters)),
        ),
    );
}

function my_excel_create_api_key($user_id)
{

    $passord = my_excel_generateRandomString(16);
    $user = user_load($user_id);
    $obj = entity_metadata_wrapper('user', $user);

    // A higher "cost" is more secure but consumes more processing power
    $cost = 10;

    // Create a random salt
    $salt = strtr(base64_encode(mcrypt_create_iv(16, MCRYPT_DEV_URANDOM)), '+', '.');

    // Prefix information about the hash so PHP knows how to verify it later.
    // "$2a$" Means we're using the Blowfish algorithm. The following two digits are the cost parameter.
    $salt = sprintf("$2a$%02d$", $cost) . $salt;

    // Hash the password with the salt
    $hash = crypt($passord, $salt);

    $obj->field_api_secret = $hash;
    $obj->save();

    return $passord;
}

function my_excel_generateRandomString($length = 16)
{
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}