<?php

require_once 'lib/EBSCODocument.php';

# global variable
$Document = null;


/******************************************
 * Hooks
 ******************************************/


/**
 * Implements hook_user_login.
 *
 * Redirects after login
 *
 */
function ebsco_user_login(&$edit, $account) {
    if (isset($_SESSION['EBSCO']['redirect'])) {
        $_GET['destination'] = urldecode($_SESSION['EBSCO']['redirect']['destination']);
        unset($_SESSION['EBSCO']['redirect']);
    }
}

/**
* Implements hook_help.
*
* Displays help and module information.
*
* @param path
*   Which path of the site we're using to display help
* @param arg
*   Array that holds the current path as returned from arg() function
*/
function ebsco_help($path, $arg) {
    $output = "";
    switch ($path) {
        case "admin/help#ebsco":
            $output .= '<h2>'.  t("Full-text articles and eBooks from EBSCOhost Discovery Services") .'</h2>';
            $output .= '<p>'. t("EBSCO Discovery Service provides users with an easy, yet powerful means of accessing all of 
                an institution's information resources through a single search.") .'</p>';
            $output .= '<p>'. t("This is achieved by harvesting metadata from both internal (library) and external (database vendors) sources, 
                and creating a pre-indexed service of unprecedented size and speed.") .'</p>';
            $output .= '<p>'. t("Although the resulting collection can be massive in size and scope, the fact that it is indexed locally 
                (on the EBSCOhost&reg; servers) allows for exceptionally fast search response times.") .'</p>';
            $output .= '<p>'. t("As no two institutions are the same, EBSCO Discovery Service offers a vast array of customization options with 
                regard to both the underlying collection of metadata as well as the front-end delivery of search results. 
                All of this functionality is based upon the powerful EBSCOhost search experience familiar to researchers worldwide.") .'</p>';
        break;
    }
    return $output;
}


/**
 * Implements hook_theme().
 */
function ebsco_theme() {
    $themes = array(
        'ebsco_result' => array(
            'template' => 'templates/ebsco-result'
        ),
        'ebsco_results' => array(
            'template' => 'templates/ebsco-results'
        ),
        'ebsco_side_facets' => array(
            'template' => 'templates/ebsco-side-facets'
        ),
        'ebsco_basic_search' => array(
            'template' => 'templates/ebsco-basic-search'
        ),
        'ebsco_advanced_search' => array(
            'template' => 'templates/ebsco-advanced-search'
        )
    );
    return $themes;
}


/**
 * Implements hook_permission().
 *
 * Since the access to our new custom pages will be granted based on
 * special permissions, we need to define what those permissions are here.
 * This ensures that they are available to enable on the user role
 * administration pages.
 */
function ebsco_permission() {
    return array(
        'administer ebsco' => array(
            'title' => t('Administer EBSCO')
        ),
        'use ebsco' => array(
            'title' => t('Use EBSCO')
        )
    );
}


/**
 * Implements hook_admin().
 *
 */
function ebsco_admin() {
    $form = array();

    $form['ebsco_credentials'] = array(
      '#type' => 'fieldset',
      '#title' => t('API credentials')
    );

    $form['ebsco_credentials']['ebsco_password'] = array(
        '#type' => 'textfield',
        '#title' => t('Password'),
        '#default_value' => variable_get('ebsco_password'),
        '#size' => 50,
        '#description' => t("The API password."),
        '#required' => TRUE
    );

    $form['ebsco_credentials']['ebsco_user'] = array(
        '#type' => 'textfield',
        '#title' => t('User Id'),
        '#default_value' => variable_get('ebsco_user'),
        '#size' => 50,
        '#description' => t("The API User Id."),
        '#required' => TRUE
    );

    $form['ebsco_credentials']['ebsco_profile'] = array(
        '#type' => 'textfield',
        '#title' => t('Profile Id'),
        '#default_value' => variable_get('ebsco_profile'),
        '#size' => 50,
        '#description' => t("The API Profile Id."),
        '#required' => TRUE
    );

    $form['ebsco_credentials']['ebsco_interface'] = array(
        '#type' => 'textfield',
        '#title' => t('Interface Id'),
        '#size' => 50,
        '#description' => t("The API Interface Id."),
        '#required' => FALSE
    );

    $form['ebsco_credentials']['ebsco_organization'] = array(
        '#type' => 'textfield',
        '#title' => t('Organization Id'),
        '#size' => 50,
        '#description' => t("The API Organization Id."),
        '#required' => FALSE
    );

    $form['ebsco_credentials']['ebsco_guest'] = array(
        '#type' => 'radios',
        '#title' => t('Guest ?'),
        '#default_value' => variable_get('ebsco_guest', 0),
        '#description' => t("The Guest session."),
        '#options' => array(t('No'), t('Yes')),
        '#required' => TRUE
    );

    $form['ebsco_general'] = array(
      '#type' => 'fieldset',
      '#title' => t('General Settings')
    );

    $form['ebsco_general']['ebsco_default_limit'] = array(
        '#type' => 'select',
        '#title' => t('Default limit'),
        '#default_value' => variable_get('ebsco_default_limit', 10),
        '#description' => t("Default number of results per page."),
        '#options' => EBSCODocument::limit_options(),
        '#required' => TRUE
    );

    $form['ebsco_general']['ebsco_default_sort'] = array(
        '#type' => 'select',
        '#title' => t('Default sort'),
        '#default_value' => variable_get('ebsco_default_sort', 'relevance'),
        '#description' => t("Default sorting option."),
        '#options' => EBSCODocument::sort_options(),
        '#required' => TRUE
    );

    $form['ebsco_general']['ebsco_default_amount'] = array(
        '#type' => 'select',
        '#title' => t('Default detail level'),
        '#default_value' => variable_get('ebsco_default_amount', 'detailed'),
        '#description' => t("Default level of data detail."),
        '#options' => EBSCODocument::amount_options(),
        '#required' => TRUE
    );

    $form['ebsco_general']['ebsco_default_mode'] = array(
        '#type' => 'select',
        '#title' => t('Default search mode'),
        '#default_value' => variable_get('ebsco_default_mode', 'all'),
        '#description' => t("Default search mode."),
        '#options' => EBSCODocument::mode_options(),
        '#required' => TRUE
    );

    return system_settings_form($form);
}


/**
 * Implements hook_menu().
 */
function ebsco_menu() {
    // Ths is a route
    $items['ebsco/results'] = array(
        'title' => 'EBSCO Results',
        'page callback' => 'ebsco_results_page',
        'access callback' => true,
        'type' => MENU_CALLBACK
    );

    $items['ebsco/result'] = array(
        'title' => 'EBSCO Record',
        'page callback' => 'ebsco_result_page',
        'access callback' => true,
        'type' => MENU_CALLBACK
    );

    $items['ebsco/pdf'] = array(
        'title' => 'EBSCO Record',
        'page callback' => 'ebsco_pdf_page',
        'access callback' => true,
        'type' => MENU_CALLBACK
    );

    $items['ebsco/fulltext'] = array(
        'title' => 'EBSCO Record',
        'page callback' => 'ebsco_fulltext_page',
        'access callback' => true,
        'type' => MENU_CALLBACK
    );

    $items['ebsco/advanced'] = array(
        'title' => 'EBSCO advanced search',
        'page callback' => 'ebsco_advanced_search_page',
        'access callback' => true,
        'type' => MENU_CALLBACK
    );

    $items['admin/config/search/ebsco'] = array(
        'title' => 'EBSCO settings',
        'description' => 'Configure EBSCO Service.',
        'page callback' => 'drupal_get_form',
        'page arguments' => array('ebsco_admin'),
        'access arguments' => array('administer ebsco'),
        'type' => MENU_NORMAL_ITEM
    );

    return $items;
}


/**
* Implements hook_block_info().
*/
function ebsco_block_info() {
    $blocks['ebsco_main'] = array(
        'info'  => t('EBSCO Search Form'),
        'cache' => DRUPAL_CACHE_PER_PAGE
    );

    $blocks['ebsco_facets'] = array(
        'info'  => t('EBSCO Narrow Search'),
        'cache' => DRUPAL_CACHE_PER_PAGE
    );

    return $blocks;
}


/**
* Implements hook_block_view().
*
* Prepares the content of the block.
*/
function ebsco_block_view($delta = '') {
    $params = $_GET;
    switch ($delta) {
        case 'ebsco_main':
            $reject = isset($params['q']) && strpos('ebsco/advanced', $params['q']) !== false;
            return array(
                'content' => $reject ? '' : ebsco_basic_search_block()
            );
            break;

        case 'ebsco_facets':
            $reject = isset($params['q']) && strpos('ebsco/advanced', $params['q']) !== false;
            $reject = $reject || (isset($params['edit']) && strpos('ebsco/results', $params['q']) !== false);
            $reject = $reject || (isset($params['q']) && strpos('ebsco/result', $params['q']) !== false);
            return array(
                'content' => $reject ? '' : ebsco_side_facets_block()
            );
        break;
    }
}


/******************************************************
 * Page callbacks
 ******************************************************/


function ebsco_results_page() {
    return theme('ebsco_results');
}


function ebsco_result_page() {
    $is_xhr = !empty($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest';
    if ($is_xhr) {
        print theme('ebsco_result');
        return true;
    } else {
        return theme('ebsco_result');
    }
}


function ebsco_fulltext_page() {
    $is_xhr = !empty($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest';
    if (user_is_logged_in()) {
        if ($is_xhr) {
            print theme('ebsco_result');
            return true;
        } else {
            return theme('ebsco_result');
        }
    } else {
        $_SESSION['EBSCO']['redirect'] = drupal_get_destination();
        if ($is_xhr) {
            echo "<script type=\"text/javascript\">window.location.href = '" . url('user') . "';</script>";
            return;
        } else {
            drupal_goto('user');
        }
    }
}


function ebsco_pdf_page() {
    global $Document;
    $params = $_REQUEST;

    if (user_is_logged_in()) {
        if (empty($Document)) {
            $Document = new EBSCODocument();
        }
        $Document->retrieve();
        $record = $Document->record();
        drupal_goto($record->pdf_link);
    } else {
        $_SESSION['EBSCO']['redirect'] = drupal_get_destination();
        drupal_goto('user');
    }
}


function ebsco_advanced_search_page() {
    return theme('ebsco_advanced_search');
}


function ebsco_basic_search_block() {
    return theme('ebsco_basic_search');
}


function ebsco_side_facets_block() {
    return theme('ebsco_side_facets');
}


/******************************************************
 * Form builders, form handlers and templates handlers
 ******************************************************/


/**
 * Form builder; Output a sort form for the search results.
 *
 * @ingroup forms
 */
function ebsco_sort_form() {
    $params = $_REQUEST;

    $form = array(
        '#attributes' => array('class' => 'sort-form'),
        '#method'     => 'get'
    );

    $options = EBSCODocument::amount_options();
    $values = array_values($options);
    $default_value = isset($params['amount']) ? $params['amount'] : $values[0];
    $form['mode'] = array(
        '#id'            => 'ebsco-amount',
        '#type'          => 'select',
        '#title'         => t('Page options'),
        '#default_value' => $default_value,
        '#options'       => $options,
        '#attributes'    => array('class' => array('form-select', '_jump_menu'))
    );

    $options = EBSCODocument::sort_options();
    $values = array_values($options);
    $default_value = isset($params['sort']) ? $params['sort'] : $values[0];
    $form['sort'] = array(
        '#id'            => 'ebsco-sort',
        '#type'          => 'select',
        '#title'         => t('Sort'),
        '#default_value' => $default_value,
        '#options'       => $options,
        '#attributes'    => array('class' => array('form-select', '_jump_menu'))
    );

    return $form;
}


/**
 * Form builder; Output a search form for the search block's search box.
 *
 * @ingroup forms
 */
function ebsco_basic_search_form() {
    $params = $_REQUEST;

    $form = array(
        '#attributes' => array('class' => 'search-form'),
        '#action'     => url('ebsco/results'),
        '#method'     => 'get'
    );

    $form['basic']['q'] = array(
        '#type'          => 'hidden',
        '#default_value' => 'ebsco/results'
    );

    $default_value = isset($params['lookfor']) ? $params['lookfor'] : '';
    $form['basic']['lookfor'] = array(
        '#id'            => 'ebsco-basic-search-lookfor',
        '#type'          => 'textfield',
        '#size'          => 40,
        '#default_value' => $default_value,
        '#attributes'    => array('title' => t('Enter the terms you wish to search for.')),
    );

    $default_value = isset($params['type']) ? $params['type'] : '';
    $form['basic']['type'] = array(
        '#id'            => 'ebsco-basic-search-type',
        '#type'          => 'select',
        '#options'       => EBSCODocument::basic_search_type_options(),
        '#default_value' => $default_value
    );

    $form['basic']['submit'] = array(
        '#id'    => 'ebsco-basic-search-submit',
        '#type'  => 'submit',
        '#value' => t('Search')
    );

    $link = url('ebsco/advanced');
    $form['basic']['links'] = array(
        '#type'  => 'fieldset',
        '#value' => "<a href=\"$link\">" . t('Advanced search') . "</a>"
    );

    $form['basic']['offscreen'] = array(
        '#type'  => 'container'
    );

    if (isset($params['filter'])) {
        foreach($params['filter'] as $key => $value) {
            $form['basic']['offscreen']['group'.$key]['filter[]'] = array(
                '#id'            => 'ebsco-basic-search-filter' . $key,
                '#type'          => 'checkbox',
                '#default_value' => $value, // doesn't work
                '#attributes'    => array('checked' => 'checked', 'value' => $value)
								
            );
        }

        $form['basic']['remember'] = array(
            '#type'          => 'checkbox',
            '#title'         => t('Retain my current filters'),
            '#prefix'        => '<br />',
            '#default_value' => true
        );
    }

    return $form;
}

/**
 * Form builder; Output a search form for the search block's search box.
 *
 * @ingroup forms
 */
function ebsco_advanced_search_form() {
    global $Document;
    $params = $_REQUEST;

    if (isset($params['edit']) && !empty($params['edit'])) {
        $query = $_SESSION['EBSCO']['last-search']['query'];
        parse_str($query, $new_params);
        $params = $_REQUEST = array_merge($_REQUEST, $new_params);
    }
    $counter = isset($params['group']) ? count($params['group']) : 3;

    $form = array(
        '#attributes' => array('class' => 'search-form'),
        '#action'     => url('ebsco/advanced')
    );

    $form['advanced'] = array(
        '#type'        => 'fieldset',
        '#title'       => t('Advanced Search'),
        '#collapsible' => false,
        '#collapsed'   => false
    );

    $form['advanced']['rows'] = array(
        '#type'        => 'fieldset',
        '#title'       => ''
    );

    for ($i = 0; $i < $counter; $i++) {
        $form['advanced']['rows']['group' . $i] = array(
            '#type'       => 'fieldset',
            '#tree'       => true,
            '#attributes' => array('class' => array('_advanced-row'))
        );

        $default_value = isset($params['group'][$i]['bool']) ? $params['group'][$i]['bool'] : '';
        if ($i > 0) {
            $form['advanced']['rows']['group' . $i]['bool'] = array(
                '#id'            => 'ebsco-advanced-search-bool' . $i,
                '#type'          => 'select',
                '#default_value' => $default_value,
                '#options'       => EBSCODocument::bool_options()
            );
        } else {
            $form['advanced']['rows']['group' . $i]['bool'] = array(
                '#id'            => 'ebsco-advanced-search-bool' . $i,
                '#type'          => 'hidden',
                '#default_value' => 'AND'
            );
        }

        $title = $i == 0 ? t('Search for :') : '';
        $default_value = isset($params['group'][$i]['lookfor']) ? $params['group'][$i]['lookfor'] : '';
        $form['advanced']['rows']['group' . $i]['lookfor'] = array(
            '#id'            => 'ebsco-advanced-search-lookfor' . $i,
            '#type'          => 'textfield',
            '#size'          => 30,
            '#default_value' => $default_value,
            '#title'         => $title,
            '#attributes'    => array('title' => t('Enter the terms you wish to search for.'))
        );

        $default_value = isset($params['group'][$i]['type']) ? $params['group'][$i]['type'] : '';
        $form['advanced']['rows']['group' . $i]['type'] = array(
            '#id'            => 'ebsco-advanced-search-type' . $i,
            '#type'          => 'select',
            '#default_value' => $default_value,
            '#title'         => t('in'),
            '#options'       => EBSCODocument::advanced_search_type_options()
        );

        if ($i > 2) {
            $form['advanced']['rows']['group' . $i]['remove'] = array(
                '#markup' => '<div class="delete-search"><a href="#" class="delete _delete_row" id="delete_search_link_' . $i . '">' . t('Remove Search Field') . '</a></div>'
            );
        }
    }

    $form['advanced']['rows']['add_row'] = array(
        '#type'  => 'fieldset',
        '#value' => "<a class=\"add _add_row\" href=\"#\">". t('Add Search Field') . "</a>"
    );

    $items = array(
        array(
            'url'   => url('ebsco/results'),
            'title' => t('Basic search')
        ),
        array(
            'url'   => url('ebsco/advanced'),
            'title' => t('Advanced search')
        )
    );
    $links = array();
    foreach ($items as $item) {
        $links[] = "<a href=\"{$item['url']}\">{$item['title']}</a>";
    }
    $form['advanced']['links'] = array(
        '#type'  => 'fieldset',
        '#value' => implode(' | ', $links)
    );

    $form['advanced']['modes'] = array(
        '#type'  => 'fieldset',
        '#title' => t('Search modes')
    );

    $form['advanced']['modes']['mode'] = array(
        '#type'          => 'radios',
        '#default_value' => 'all',
        '#options'       => EBSCODocument::mode_options()
    );

    $expanders = $Document->expanders();
    $limiters = $Document->limiters();
    $options = array('' => true);
    foreach($expanders as $key => $expander) {
        $options[$expander['Action']] = true;
    }
    foreach($limiters as $key => $limiter) {
        if (!empty($limiter['Values'])) {
            $options[$limiter['Id']] = true;
            foreach($limiter['Values'] as $value) {
                $options[str_replace('value', $value['Value'], $value['Action'])] = true;
            }
        } else {
            $options[str_replace('value', 'y', $limiter['Action'])] = true;
        }
    }

    $form['advanced']['expanders'] = array(
        '#type'  => 'fieldset',
        '#title' => t('Expand results')
    );

    $form['advanced']['limiters'] = array(
        '#type'  => 'fieldset',
        '#title' => t('Limit results')
    );

    $children = array();
    foreach($expanders as $key => $expander) {
        $element = array(
            '#type'          => 'checkbox',
            '#id'            => 'ebsco-advanced-search-expander' . $key,
            '#title'         => $expander['Label'],
            '#title_display' => 'after',
            '#name'          => 'filter[]',
            '#attributes'    => array('value' => $expander['Action']),
            '#checked'       => $expander['selected']	
        );
		$element['#children'] = ($key != 0) ? '<br />' : '';
        $element['#children'] .= theme('checkbox', array('element' => $element));
		
        $children[] = theme('form_element', array('element' => $element));

    }

    $form['advanced']['expanders']['filter'] = array(
        '#type'      => 'checkboxes',
        '#validated' => true,
        '#options'   => $options,
        '#children'  => implode('', $children)
    );

    $checkboxes = $selects = $dates = array(); 
    foreach($limiters as $key => $limiter) {
        if ($limiter['Type'] == 'text' || $limiter['Type'] == 'select') {
            $element = array(
                '#type'          => 'checkbox',
                '#id'            => 'ebsco-advanced-search-limiter' . $limiter['Id'],
                '#title'         => $limiter['Label'],
                '#title_display' => 'after',
                '#name'          => 'filter[]',
                '#attributes'    => array('value' => str_replace('value', 'y', $limiter['Action'])),
                '#checked'       => $limiter['selected']
				
            );
            $element['#children'] = ($key != 0) ? '<br />' : '';
			if (!isset($element['#children']))
				{$element['#children']="";}
            $element['#children'] .= theme('checkbox', array('element' => $element));
            $checkboxes[] = theme('form_element', array('element' => $element));
        } else if ($limiter['Type'] == 'multiselectvalue') {
            $opts = array('' => t('All'));
            foreach($limiter['Values'] as $value) {
                $opts[$value['Action']] = $value['Value'];
            }
            $element = array(
                '#type'          => 'select',
                '#multiple'      => true,
                '#size'          => 4,
                '#id'            => 'ebsco-advanced-search-limiter' . $limiter['Id'],
                '#title'         => $limiter['Label'],
                '#name'          => 'filter[]',
                '#options'       => $opts,
                '#default_value' => $limiter['selected'], // empty value means "All"
                '#value'         => $limiter['selected'],
                '#attributes'    => array('class' => array('multiselectvalue'), 'multiple' => 'multiple')
            );
            $element['#children'] = theme('select', array('element' => $element));
            $selects[] = theme('form_element', array('element' => $element));
        } else if ($limiter['Type'] == 'ymrange') {
            $value = $limiter['selected'] ? $limiter['selected'] : '';
            $displayValue = str_replace(array('addlimiter(DT1:', '-1/2013-1)'), array('', ''), $value);
            $element = array(
                '#type'              => 'textfield',
                '#id'                => $limiter['Id'],
                '#title'             => $limiter['Label'],
                '#value'             => $displayValue,
                '#name'              => $limiter['Id'],
                '#autocomplete_path' => null,
                '#attributes'        => array('size' => 4, 'maxlength' => 4, 'class' => array('yearbox'))
            );
            $element['#children'] = theme('textfield', array('element' => $element));
            $element['#children'] .= '<input id="ebsco-advanced-search-limiter' . $limiter['Id'] . '" type="hidden" name="filter[]" value="' . $value . '"/>';
            $element['#children'] .= '<div id="ebsco-advanced-search-slider' . $limiter['Id'] . '" class="dateSlider"></div>';
            $dates[] = theme('form_element', array('element' => $element));
        }
    }

    $form['advanced']['limiters']['checkboxes'] = array(
        '#type'      => 'checkboxes',
        '#validated' => true,
        '#options'   => $options,
        '#children'  => implode('', $checkboxes),
    );

    $form['advanced']['limiters']['dates'] = array(
        '#type'      => 'container',
        '#validated' => true,
        '#prefix'    => '<hr />',
        '#children'  => implode('', $dates)
    );

    $form['advanced']['limiters']['selects'] = array(
        '#type'      => 'container',
        '#prefix'    => '<hr />',
        '#validated' => true,
        '#children'  => implode('', $selects)
    );

    $form['advanced']['submit'] = array(
        '#id'    => 'ebsco-advanced-search-submit',
        '#type'  => 'submit',
        '#value' => t('Search')
    );

    $form['advanced']['clear'] = array(
        '#markup'  => '<input id="ebsco-advanced-search-clear" class="form-submit" type="reset" value="' . t('Clear') . '" name="reset">'
    );

    return $form;
}


/**
 * Form validation handler for ebsco_basic_search_form().
 *
 * @see ebsco_basic_search_form_submit()
 */
function ebsco_basic_search_form_validate($form, &$form_state) {
    $params = $form_state['values'];
    if (empty($params['lookfor'])) {
        form_set_error('lookfor', t('Please enter some keywords.'));
    }
}


/**
 * Form validation handler for ebsco_advanced_search_form().
 *
 * @see ebsco_advanced_search_form_submit()
 */
function ebsco_advanced_search_form_validate($form, &$form_state) {
    $params = $form_state['values'];
    if (empty($params['group0']['lookfor']) &&
        empty($params['group1']['lookfor']) &&
        empty($params['group2']['lookfor'])) {
        form_set_error('group0][lookfor', t('Please enter some keywords.'));
    }
}


/**
 * Form submission handler for ebsco_basic_search_form().
 *
 * @see ebsco_basic_search_form_validate()
 */
function ebsco_basic_search_form_submit($form, &$form_state) {
    $params = $form_state['values'];
    $allowed_keys = array('lookfor', 'type');
    foreach($params as $key => $value) {
        if (!in_array($key, $allowed_keys)) {
            unset($params[$key]);
        }
    }
    $form_state['rebuild'] = false;
    $form_state['redirect'] = array('ebsco/results', array('query' => $params));
}


/**
 * Form submission handler for ebsco_advanced_search_form().
 *
 * @see ebsco_advanced_search_form_validate()
 */
function ebsco_advanced_search_form_submit($form, &$form_state) {
    $params = $_REQUEST;
    $new_params = array();
    $allowed_keys = array('filter', 'mode');

    foreach($params as $key => $value) {
        if (!(in_array($key, $allowed_keys) || strpos($key, 'group') !== false)) {
            unset($params[$key]);
        } else {
            if ($key == 'filter') {
                foreach($value as $k => $v) {
                    if (empty($v)) {
                        unset($params[$key][$k]);
                    }
                }
            } else if (empty($value)) {
                unset($params[$key]);
            }
        }
    }

    foreach($params as $key => $value) {
        if (strpos($key, 'group') !== false) {
            $new_params['group'][] = $value;
            unset($params[$key]);
        }
    }
    $params = array_merge($params, $new_params);

    $form_state['rebuild'] = false;
    $form_state['redirect'] = array('ebsco/results', array('query' => $params));
}


/**
 * Process variables for ebsco-results.tpl.php.
 *
 * @see ebsco-results.tpl.php
 */
function template_preprocess_ebsco_results(&$variables) {
    global $Document;
    $params = $_REQUEST;

    $_SESSION['EBSCO']['redirect'] = drupal_get_destination();
    if (empty($Document)) {
        $Document = new EBSCODocument();
    }

    $title = !empty($params['lookfor']) ? ' - ' . $params['lookfor'] : '';
    drupal_set_title('Search results' . $title);

    $Document->search();

    $variables['records'] = $Document->records();
    $variables['record_start'] = $Document->record_start();
    $variables['record_end'] = $Document->record_end();
    $variables['record_count'] = $Document->record_count();
    $variables['search_view'] = $Document->search_view();
    $variables['search_time'] = $Document->search_time();
    $variables['lookfor'] = '';
    if (isset($params['lookfor'])) {
        $variables['lookfor'] = $params['lookfor'];
    } else if (isset($params['group'])) {
        $types = EBSCODocument::basic_search_type_options();
        foreach ($params['group'] as $key => $group) {
            if (!empty($group['lookfor'])) {
                $pre = $key == 0 ? '' : " {$group['bool']} ";
                $variables['lookfor'] .= $pre . $types[$group['type']] . ':' . $group['lookfor'];
            }
        }
    }
    $variables['pager'] = $Document->pager();

	$v1=drupal_get_form('ebsco_sort_form');
    $variables['sort_form'] = drupal_render($v1);

    // Save data needed by scroller in Detailed view page
    $Document->search_write();
}


/**
 * Process variables for ebsco-basic-search.tpl.php.
 *
 * @see ebsco-basic-search.tpl.php
 */
function template_preprocess_ebsco_basic_search(&$variables) {
    global $Document;
    $params = $_REQUEST;

    if (empty($Document)) {
        $Document = new EBSCODocument();
    }

    $variables['search_view'] = $Document->search_view();
    $variables['lookfor'] = '';
    if (isset($params['lookfor'])) {
        $variables['lookfor'] = $params['lookfor'];
    } else if (isset($params['group'])) {
        $types = EBSCODocument::basic_search_type_options();
        foreach ($params['group'] as $key => $group) {
            if (!empty($group['lookfor'])) {
                $pre = $key == 0 ? '' : " {$group['bool']} ";
                $variables['lookfor'] .= $pre . $types[$group['type']] . ':' . $group['lookfor'];
            }
        }
    }
	$v1=drupal_get_form('ebsco_basic_search_form');
    $variables['search_form'] = drupal_render($v1);
}


/**
 * Process variables for ebsco-advanced-search.tpl.php.
 *
 * @see ebsco-advanced-search.tpl.php
 */
function template_preprocess_ebsco_advanced_search(&$variables) {
    drupal_add_library('system','ui.slider');
    global $Document;
    $params = $_REQUEST;

    if (empty($Document)) {
        $Document = new EBSCODocument();
    }
    $Document->info();

	$v1=drupal_get_form('ebsco_advanced_search_form');
    $variables['search_form'] = drupal_render($v1);
}


/**
 * Process variables for ebsco-result.tpl.php.
 *
 * @see ebsco-result.tpl.php
 */
function template_preprocess_ebsco_result(&$variables) {
    $params = $_REQUEST;
    $params['op'] = isset($params['op']) ? $params['op'] : 'Next';

    $_SESSION['EBSCO']['redirect'] = drupal_get_destination();
    if (empty($Document)) {
        $Document = new EBSCODocument();
    }
    $Document->retrieve();
    $record = $Document->record();

    $variables['record'] = $record;
    $lastSearch = isset($params['id']) ? $Document->search_read($params['id'], $params['op']) : '';
    $variables['last_search'] = $lastSearch;

    drupal_set_title($record->title);
}


/**
 * Process variables for ebsco-side-facets.tpl.php.
 *
 * @see ebsco-side-facets.tpl.php
 */
function template_preprocess_ebsco_side_facets(&$variables) {
    global $Document;

    if (empty($Document)) {
        $Document = new EBSCODocument();
    }
    $Document->info();

    $variables['record_count'] = $Document->record_count();
    $variables['expanders'] = $Document->expanders();
    $variables['limiters'] = $Document->limiters();
    $variables['facets'] = $Document->facets();
    $variables['filters'] = $Document->filters();     // applied facets, limiters or expanders
    $variables['search_params'] = $Document->search_params(); // hidden parameters
    $variables['link_search_params'] = $Document->link_search_params(); // hidden parameters
}


/******************************************
 * View Helpers
 ******************************************/

/**
 * Returns an URL without the given filter parameter
 *
 * @return string
 */
function remove_filter_link($filter)
{
    $params = $_REQUEST;
    if (isset($params['filter'])) {
        foreach($params['filter'] as $key => $value) {
            if ($value == $filter['action']) {
                unset($params['filter'][$key]);
            }
        }
    }
    return url('ebsco/results', array('query' => $params));
}


/**
  * Performs a regex and replaces any url's with links containing themselves as the text
  *
  * @return string
  */
function auto_link($string)
{
    $linkedString = preg_replace_callback(
        "/\b(https?):\/\/([-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|]*)\b/i",
        create_function(
            '$matches',
            'return "<a href=\'".($matches[0])."\'>".($matches[0])."</a>";'
        ),
        $string
    );
    return $linkedString;
}