<?php
// $Id$

/**
 * Basic textfield filter to handle string filtering commands
 * including equality, like, not like, etc.
 */
class views_handler_filter_string extends views_handler_filter {
  // exposed filter options
  var $no_single = TRUE;

  function option_definition() {
    $options = parent::option_definition();

    $options['case'] = array('default' => TRUE);

    return $options;
  }

  /**
   * This kind of construct makes it relatively easy for a child class
   * to add or remove functionality by overriding this function and
   * adding/removing items from this array.
   */
  function operators() {
    $operators = array(
      '=' => array(
        'title' => t('Is equal to'),
        'short' => t('='),
        'method' => 'op_equal',
        'values' => 1,
      ),
      '!=' => array(
        'title' => t('Is not equal to'),
        'short' => t('!='),
        'method' => 'op_equal',
        'values' => 1,
      ),
      'contains' => array(
        'title' => t('Contains'),
        'short' => t('contains'),
        'method' => 'op_contains',
        'values' => 1,
      ),
      'word' => array(
        'title' => t('Contains any word'),
        'short' => t('has word'),
        'method' => 'op_word',
        'values' => 1,
      ),
      'allwords' => array(
        'title' => t('Contains all words'),
        'short' => t('has all'),
        'method' => 'op_word',
        'values' => 1,
      ),
      'starts' => array(
        'title' => t('Starts with'),
        'short' => t('begins'),
        'method' => 'op_starts',
        'values' => 1,
      ),
      'ends' => array(
        'title' => t('Ends with'),
        'short' => t('ends'),
        'method' => 'op_ends',
        'values' => 1,
      ),
      'not' => array(
        'title' => t('Does not contain'),
        'short' => t('!has'),
        'method' => 'op_not',
        'values' => 1,
      ),
    );
    // if the definition allows for the empty operator, add it.
    if (!empty($this->definition['allow empty'])) {
      $operators += array(
        'empty' => array(
          'title' => t('Is empty (NULL)'),
          'method' => 'op_empty',
          'short' => t('empty'),
          'values' => 0,
        ),
        'not empty' => array(
          'title' => t('Is not empty (NULL)'),
          'method' => 'op_empty',
          'short' => t('not empty'),
          'values' => 0,
        ),
      );
    }

    return $operators;
  }

  /**
   * Build strings from the operators() for 'select' options
   */
  function operator_options($which = 'title') {
    $options = array();
    foreach ($this->operators() as $id => $info) {
      $options[$id] = $info[$which];
    }

    return $options;
  }

  function admin_summary() {
    if (!empty($this->options['exposed'])) {
      return t('exposed');
    }

    $options = $this->operator_options('short');
    $output = check_plain($options[$this->operator]);
    if (in_array($this->operator, $this->operator_values(1))) {
      $output .= ' ' . check_plain($this->value);
    }
    return $output;
  }

  function options_form(&$form, &$form_state) {
    parent::options_form($form, $form_state);
    $form['case'] = array(
      '#type' => 'checkbox',
      '#title' => t('Case sensitive'),
      '#default_value' => $this->options['case'],
      '#description' => t('Case sensitive filters may be faster. MySQL might ignore case sensitivity.'),
    );
  }

  function operator_values($values = 1) {
    $options = array();
    foreach ($this->operators() as $id => $info) {
      if (isset($info['values']) && $info['values'] == $values) {
        $options[] = $id;
      }
    }

    return $options;
  }

  /**
   * Provide a simple textfield for equality
   */
  function value_form(&$form, &$form_state) {
    // We have to make some choices when creating this as an exposed
    // filter form. For example, if the operator is locked and thus
    // not rendered, we can't render dependencies; instead we only
    // render the form items we need.
    $which = 'all';
    if (!empty($form['operator'])) {
      $source = ($form['operator']['#type'] == 'radios') ? 'radio:options[operator]' : 'edit-options-operator';
    }
    if (!empty($form_state['exposed'])) {
      $identifier = $this->options['expose']['identifier'];

      if (empty($this->options['expose']['use_operator']) || empty($this->options['expose']['operator'])) {
        // exposed and locked.
        $which = in_array($this->operator, $this->operator_values(1)) ? 'value' : 'none';
      }
      else {
        $source = 'edit-' . form_clean_id($this->options['expose']['operator']);
      }
    }

    if ($which == 'all' || $which == 'value') {
      $form['value'] = array(
        '#type' => 'textfield',
        '#title' => t('Value'),
        '#size' => 30,
        '#default_value' => $this->value,
      );
      if (!empty($form_state['exposed']) && !isset($form_state['input'][$identifier])) {
        $form_state['input'][$identifier] = $this->value;
      }

      if ($which == 'all') {
        $form['value'] += array(
          '#process' => array('views_process_dependency'),
          '#dependency' => array($source => $this->operator_values(1)),
        );
      }
    }

    if (!isset($form['value'])) {
      // Ensure there is something in the 'value'.
      $form['value'] = array(
        '#type' => 'value',
        '#value' => NULL
      );
    }
  }

  function case_transform() {
    return !empty($this->options['case']) ? '' : 'UPPER';
  }

  /**
   * Add this filter to the query.
   *
   * Due to the nature of fapi, the value and the operator have an unintended
   * level of indirection. You will find them in $this->operator
   * and $this->value respectively.
   */
  function query() {
    $this->ensure_my_table();
    $field = "$this->table_alias.$this->real_field";
    $upper = $this->case_transform();

    $info = $this->operators();
    if (!empty($info[$this->operator]['method'])) {
      $this->{$info[$this->operator]['method']}($field, $upper);
    }
  }

  function op_equal($field, $upper) {
    // operator is either = or !=
    $this->query->add_where($this->options['group'], "$upper(%s) $this->operator $upper('%s')", $field, $this->value);
  }

  function op_contains($field, $upper) {
    $this->query->add_where($this->options['group'], "$upper(%s) LIKE $upper('%%%s%%')", $field, $this->value);
  }

  function op_word($field, $upper) {
    $where = array();
    preg_match_all('/ (-?)("[^"]+"|[^" ]+)/i', ' ' . $this->value, $matches, PREG_SET_ORDER);
    foreach ($matches as $match) {
      $phrase = false;
      // Strip off phrase quotes
      if ($match[2]{0} == '"') {
        $match[2] = substr($match[2], 1, -1);
        $phrase = true;
      }
      $words = trim($match[2], ',?!();:-');
      $words = $phrase ? array($words) : preg_split('/ /', $words, -1, PREG_SPLIT_NO_EMPTY);
      foreach ($words as $word) {
        $where[] = "$upper(%s) LIKE $upper('%%%s%%')";
        $values[] = $field;
        $values[] = trim($word, " ,!?");
      }
    }

    if (!$where) {
      return;
    }

    if ($this->operator == 'word') {
      $where = '(' . implode(' OR ', $where) . ')';
    }
    else {
      $where = implode(' AND ', $where);
    }
    // previously this was a call_user_func_array but that's unnecessary
    // as views will unpack an array that is a single arg.
    $this->query->add_where($this->options['group'], $where, $values);
  }

  function op_starts($field, $upper) {
    $this->query->add_where($this->options['group'], "$upper(%s) LIKE $upper('%s%%')", $field, $this->value);
  }

  function op_ends($field, $upper) {
    $this->query->add_where($this->options['group'], "$upper(%s) LIKE $upper('%%%s')", $field, $this->value);
  }

  function op_not($field, $upper) {
    $this->query->add_where($this->options['group'], "$upper(%s) NOT LIKE $upper('%%%s%%')", $field, $this->value);
  }

  function op_empty($field) {
    if ($this->operator == 'empty') {
      $operator = "IS NULL";
    }
    else {
      $operator = "IS NOT NULL";
    }

    $this->query->add_where($this->options['group'], "$field $operator");
  }

}