<?php

/**
 * @file
 * Definition of views_handler_filter_date.
 */

/**
 * Filter to handle dates stored as a timestamp.
 *
 * @ingroup views_filter_handlers
 */
class views_handler_filter_date extends views_handler_filter_numeric {

  /**
   * {@inheritdoc}
   */
  public function option_definition() {
    $options = parent::option_definition();

    // Value is already set up properly, we're just adding our new field to it.
    $options['value']['contains']['type']['default'] = 'date';

    return $options;
  }

  /**
   * Add a type selector to the value form.
   */
  public function value_form(&$form, &$form_state) {
    if (empty($form_state['exposed'])) {
      $form['value']['type'] = array(
        '#type' => 'radios',
        '#title' => t('Value type'),
        '#options' => array(
          'date' => t('A date in any machine readable format. CCYY-MM-DD HH:MM:SS is preferred.'),
          'offset' => t('An offset from the current time such as "!example1" or "!example2"', array('!example1' => '+1 day', '!example2' => '-2 hours -30 minutes')),
        ),
        '#default_value' => !empty($this->value['type']) ? $this->value['type'] : 'date',
      );
    }
    parent::value_form($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function options_validate(&$form, &$form_state) {
    parent::options_validate($form, $form_state);

    if (!empty($this->options['exposed']) && empty($form_state['values']['options']['expose']['required'])) {
      // Who cares what the value is if it's exposed and non-required.
      return;
    }

    $this->validate_valid_time($form['value'], $form_state['values']['options']['operator'], $form_state['values']['options']['value']);
  }

  /**
   * {@inheritdoc}
   */
  public function exposed_validate(&$form, &$form_state) {
    if (empty($this->options['exposed'])) {
      return;
    }

    if (empty($this->options['expose']['required'])) {
      // Who cares what the value is if it's exposed and non-required.
      return;
    }

    $value = &$form_state['values'][$this->options['expose']['identifier']];
    if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id'])) {
      $operator = $form_state['values'][$this->options['expose']['operator_id']];
    }
    else {
      $operator = $this->operator;
    }

    $this->validate_valid_time($this->options['expose']['identifier'], $operator, $value);

  }

  /**
   * Validate that the time values convert to something usable.
   */
  public function validate_valid_time(&$form, $operator, $value) {
    $operators = $this->operators();

    if ($operators[$operator]['values'] == 1) {
      $convert = strtotime($value['value']);
      if (!empty($form['value']) && ($convert == -1 || $convert === FALSE)) {
        form_error($form['value'], t('Invalid date format.'));
      }
    }
    elseif ($operators[$operator]['values'] == 2) {
      $min = strtotime($value['min']);
      if ($min == -1 || $min === FALSE) {
        form_error($form['min'], t('Invalid date format.'));
      }
      $max = strtotime($value['max']);
      if ($max == -1 || $max === FALSE) {
        form_error($form['max'], t('Invalid date format.'));
      }
    }
  }

  /**
   * Validate the build group options form.
   */
  public function build_group_validate($form, &$form_state) {
    // Special case to validate grouped date filters, this is because the
    // $group['value'] array contains the type of filter (date or offset)
    // and therefore the number of items the comparission has to be done
    // against 'one' instead of 'zero'.
    foreach ($form_state['values']['options']['group_info']['group_items'] as $id => $group) {
      if (empty($group['remove'])) {
        // Check if the title is defined but value wasn't defined.
        if (!empty($group['title'])) {
          if ((!is_array($group['value']) && empty($group['value'])) || (is_array($group['value']) && count(array_filter($group['value'])) == 1)) {
            form_error($form['group_info']['group_items'][$id]['value'], t('The value is required if title for this item is defined.'));
          }
        }

        // Check if the value is defined but title wasn't defined.
        if ((!is_array($group['value']) && !empty($group['value'])) || (is_array($group['value']) && count(array_filter($group['value'])) > 1)) {
          if (empty($group['title'])) {
            form_error($form['group_info']['group_items'][$id]['title'], t('The title is required if value for this item is defined.'));
          }
        }
      }
    }
  }

  /**
   * {@inheritdoc}
   */
  public function accept_exposed_input($input) {
    if (empty($this->options['exposed'])) {
      return TRUE;
    }

    // Store this because it will get overwritten.
    $type = $this->value['type'];
    $rc = parent::accept_exposed_input($input);

    // Don't filter if value(s) are empty.
    $operators = $this->operators();
    if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id'])) {
      $operator = $input[$this->options['expose']['operator_id']];
    }
    else {
      $operator = $this->operator;
    }

    if ($operators[$operator]['values'] == 1) {
      if ($this->value['value'] == '') {
        return FALSE;
      }
    }
    elseif ($operators[$operator]['values'] == 2) {
      if ($this->value['min'] == '' || $this->value['max'] == '') {
        return FALSE;
      }
    }

    // Restore what got overwritten by the parent.
    $this->value['type'] = $type;
    return $rc;
  }

  /**
   *
   */
  public function op_between($field) {
    // Use the substitutions to ensure a consistent timestamp.
    $query_substitutions = views_views_query_substitutions($this->view);
    $a = intval(strtotime($this->value['min'], $query_substitutions['***CURRENT_TIME***']));
    $b = intval(strtotime($this->value['max'], $query_substitutions['***CURRENT_TIME***']));

    // This is safe because we are manually scrubbing the values. It is
    // necessary to do it this way because $a and $b are formulas when using an
    // offset.
    $operator = strtoupper($this->operator);
    $this->query->add_where_expression($this->options['group'], "$field $operator $a AND $b");
  }

  /**
   *
   */
  public function op_simple($field) {
    // Use the substitutions to ensure a consistent timestamp.
    $query_substitutions = views_views_query_substitutions($this->view);
    $value = intval(strtotime($this->value['value'], $query_substitutions['***CURRENT_TIME***']));

    // This is safe because we are manually scrubbing the value. It is
    // necessary to do it this way because $value is a formula when using an
    // offset.
    $this->query->add_where_expression($this->options['group'], "$field $this->operator $value");
  }

}
