<?php
/**
 * Implementation of hook_menu().
 */
function ec_terms_menu($may_cache) {
  $items = array();

  if ($may_cache) { 
    $items[] = array(
      'path' => 'admin/ecsettings/ec_terms',
      'title' => t('Terms & Conditions'),
      'description' => t('Specify the Terms & Conditions that will be presented to a user during the checkout process.'),
      'callback' => 'drupal_get_form',
      'callback arguments' => array('ec_terms_details'),
      'access' => user_access('administer ec_terms'),
      'type' => MENU_NORMAL_ITEM,
    );
  }
  else {
  }
  return $items;
}

/**
 * Implementation of hook_perm().
 */
function ec_terms_perm() {
  return array('administer ec_terms');
}

// Generate settings form.
function ec_terms_details() {
  
  $form['ec_terms']['switch'] = array(
    '#type' => 'select',
    '#title' => t('Require user to agree to terms and conditions?'),
    '#options' => array('Y' => t('Yes'), 'N' => t('No')),
    '#default_value' => (variable_get('ec_terms_switch', true) ? 'Y' : 'N'),
    '#required' => true,
  );
  $form['ec_terms']['how'] = array(
    '#type' => 'select',
    '#title' => t('When to present terms'),
    '#description' => t('Choose whether to present terms on the review page or on a separate screen'),
    '#options' => array('page' => t('Separate screen'), 'review' => t('Checkout review')),
    '#default_value' => variable_get('ec_terms_page', 'page'),
    '#required' => true,
  );
  $form['ec_terms']['name'] = array(
    '#type' => 'textfield',
    '#title' => t('Title of Terms & Conditions'),
    '#description' => t('Examples: terms, refund policy, return policy, etc'),
    '#default_value' => variable_get('ec_terms_title', t('Terms & Conditions')),
  );
  $form['ec_terms']['text'] = array(
    '#type' => 'textarea',
    '#title' => t('Terms'),
    '#description' => t('These will be displayed during the checkout process. HTML Accepted'),
    '#cols' => 60,
    '#rows' => 15,
    '#default_value' => variable_get('ec_terms', ''),
  );
  $form['ec_terms']['fail'] = array(
    '#type' => 'textfield',
    '#title' => t('Failure text'),
    '#description' => t('The message to be displayed if agreement is required but the checkbox is not checked.'),
    '#default_value' => variable_get('ec_terms_fail', t('Accept our terms and conditions in order to continue')),
  );
  $form['ec_terms']['confirmation'] = array(
    '#type' => 'textfield',
    '#title' => t('Confirmation text'),
    '#description' => t('Example: !example', array('!example' => t('I agree to the above terms and conditions'))),
    '#default_value' => variable_get('ec_terms_confirmation', t('I agree to the above terms and conditions')),
  );
  return system_settings_form($form);
}


function ec_terms_details_validate($form_id, $form_values) {
  if ($form_values['switch'] == 'Y') {
    if ($form_values['text'] == '') {
      form_set_error('ec_terms][text', t('You must provide some terms for the user to agree to.'));
    }
    if ($form_values['name'] == '') {
      form_set_error('ec_terms][name', t('You must provide a title for your terms'));
    }
    if ($form_values['fail'] == '') {
      form_set_error('ec_terms][fail', t('You must provide some failure text.'));
    }
  }  
}


function ec_terms_details_submit($form_id, $form_values) {
  variable_set('ec_terms', $form_values['text']);
  variable_set('ec_terms_switch', ($form_values['switch'] == 'Y'));
  variable_set('ec_terms_page', $form_values['how']);
  variable_set('ec_terms_title', $form_values['name']);
  variable_set('ec_terms_confirmation', $form_values['confirmation']);
  variable_set('ec_terms_fail', $form_values['fail']);
  if ($form_values['switch'] == 'Y'){    
    drupal_set_message(t('ec_terms will be required during checkout'));
  }
  else {    
    drupal_set_message(t('ec_terms will not be required during checkout (no checkbox will be presented)'));
  }
  
  if ($form_values['how'] == 'page') {
    drupal_set_message(t('ec_terms will be a separate screen during checkout.'));
  }
  else {
    drupal_set_message(t('ec_terms will be shown on the review screen'));
  }
  if ($form_values['name'] !== '') {
    drupal_set_message(t('ec_terms will be titled %title', array('%title' => $form_values['name'])));
  }
}

/**
 * Implementation of hook_checkoutapi(). 
 */ 
function ec_terms_checkoutapi(&$txn, $op, $arg3 = NULL, $arg4 = NULL){
  $ec_terms_string = variable_get('ec_terms', '');
  $ec_terms = filter_xss($ec_terms_string, $allowed_tags = array('a', 'em', 'strong', 'ul', 'ol', 'li', 'dl', 'dt', 'dd', 'div'));
  $ec_terms_title = check_plain(variable_get('ec_terms_title', t('Terms & Conditions')));
  $ec_terms_page = variable_get('ec_terms_page', 'page');
  $ec_terms_switch = variable_get('ec_terms_switch', true);
  $ec_terms_fail = variable_get('ec_terms_fail', t('Accept our !terms_title in order to continue', array('!terms_title' => $ec_terms_title)));
  
  $output = '';
  switch ($op) {
    case 'form':
      if ($ec_terms_page == 'page') {
        //drupal_set_title(variable_get('ec_terms_title', ''));
        $form = _present_ec_terms($ec_terms, $ec_terms_title);
        
        $form['submit'] = array(
          '#type' => 'submit',
          '#value' => t('Checkout'),
        );

        return $form;
      }
    break;

    case 'validate':
      if ($ec_terms_switch && (!$txn->ec_terms_agree)) {
        form_set_error('error', $ec_terms_fail);
      }
    break;

    case 'save':
      if ($txn->ec_terms !== 0) {
        $txn->screen++;
      }
    break;

    case 'review':
      if ($ec_terms_page == 'review'){
        $form = _present_ec_terms($ec_terms, $ec_terms_title);
        return $form;
      }
    break;
      
    case 'review_validate':
      if ($ec_terms_page == 'review' && $ec_terms_switch && !$txn->ec_terms_agree) {
        form_set_error('error', $ec_terms_fail);
      }
    break;

    case 'review_save':
      $txn->screen++;
    break;
  }
}

function theme_ec_terms_review_form(&$form) {
  // Build the ec_terms data form.
  $details = drupal_render_form('ec_terms', $form);
  // Render it in a box to match other checkout review items.
  $output = theme('box', variable_get('ec_terms_title', t('Terms & Conditions')), $details);
  return $output;
}

function _present_ec_terms($ec_terms, $ec_terms_title) {
  
  $form['text'] = array(
    '#type' => 'markup',
    '#prefix' => '<div class="ec_terms">',
    '#value' => $ec_terms,
    '#suffix' => '</div>',
  );
  
  if (variable_get('ec_terms_switch', true)) {
    $form['ec_terms_agree'] = array(
      '#type' => 'checkbox',
      '#title' => variable_get('ec_terms_confirmation', t('I agree to the above !terms_title', array('!terms_title' => $ec_terms_title))),
    );
  }
  return $form;
}