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<?php namespace ProcessWire;

/**
 * ProcessWire Page Auto Completion select widget
 *
 * This Inputfield connects the jQuery UI Autocomplete widget with the ProcessWire ProcessPageSearch AJAX API.
 *
 * ProcessWire 3.x, Copyright 2019 by Ryan Cramer
 * https://processwire.com
 * 
 * @property int $parent_id Limit results to this parent, or if combined with findPagesSelector, the search is performed as $pages->get($parent_id)->find() rather than $pages->find().
 * @property int $template_id Limit results to pages using this template.
 * @property array $template_ids Limit results to pages using this templates (alternate to the single template_id). 
 * @property string $labelFieldName Field to display in the results. (default=title)
 * @property string $labelFieldFormat Format string to display in the results, overrides labelFieldName when used (default=blank).
 * @property string $searchFields Field(s) to search for text. Separate multiple by a space. (default=title)
 * @property string $operator Selector operator to use in performing the search (default: %=)
 * @property string $findPagesSelector Optional selector to use for finding pages (default=blank)
 * @property int $maxSelectedItems Maximum number of items that may be selected (0=unlimited, default).
 * @property bool $useList Whether or not to use a separate selected list. If false specified, selected item will be populated directly to the input. (default=true)
 * @property bool $allowAnyValue Allow any value to stay in the input, even if not selectable? (default=false)
 * @property string $disableChars Autocomplete won't be triggered if input contains any of the characters in this string. (default=blank)
 * @property bool $useAndWords When true, each word will be isolated to a separate searchFields=searchValue, which enables it to duplicate ~= operator behavior while using a %= operator (default=false).
 * @property int $lang_id Force use of this language for results
 * 
 * @method string renderList()
 * @method string renderListItem($label, $value, $class = '')
 *
 */
class InputfieldPageAutocomplete extends Inputfield implements InputfieldHasArrayValue, InputfieldHasSortableValue {

  public static function getModuleInfo() {
    return array(
      'title' => __('Page Auto Complete', __FILE__), // Module Title
      'summary' => __('Multiple Page selection using auto completion and sorting capability. Intended for use as an input field for Page reference fields.', __FILE__), // Module Summary
      'version' => 112,
      );
  }

  /**
   * Initialize variables used for the autocompletion
   *
   */
  public function init() {
    parent::init();

    // limit results to this parent, or if combined with a 'findPagesSelector', 
    // the search is performed as $pages->get($parent_id)->find() rather than $pages->find()
    $this->set('parent_id', 0); 

    // limit results to pages using this template
    $this->set('template_id', 0);
    $this->set('template_ids', array()); 

    // field to display in the results
    $this->set('labelFieldName', 'title'); 
    
    // format string to display in the results (instead of labelFieldName, when used)
    $this->set('labelFieldFormat', '');

    // field(s) to search for text, separate multiple by a space
    $this->set('searchFields', 'title'); 

    // operator to use in performing the search
    $this->set('operator', '%='); 

    // optional selector to use for all other properties
    $this->set('findPagesSelector', ''); 
  
    // maximum number of items that may be selected
    $this->set('maxSelectedItems', 0); 
  
    // whether or not to use the selection list
    // if not used, selected value will be populated directly to input
    $this->set('useList', true); 
  
    // allow a non-selectable value to stay in the autocomplete input? 
    // useful for situations where autocomplete might be used for collection of other values
    // like when used with ProcessPageEditLink
    $this->set('allowAnyValue', false);
  
    // autocomplete won't be triggered if input contains any characters present in this string
    $this->set('disableChars', ''); 
  
    // when true, each word will be isolated to a separate searchFields=searchValue, which 
    // enables it to duplicate ~= operator behavior while using a %= operator. 
    $this->set('useAndWords', false); 
  
    // Force Language when applicable
    $this->set('lang_id', 0);
  
    // Whether to allow unpublished pages (null=not set, 0|false=no, 1|true=yes)
    $this->set('allowUnpub', null);
  }

  /**
   * Render a selected list item 
   * 
   * @param string $label
   * @param string $value
   * @param string $class
   * @return string
   *
   */
  protected function ___renderListItem($label, $value, $class = '') {
    if($class) $class = " $class";
    if(strpos($label, '&') !== false) $label = $this->wire('sanitizer')->unentities($label);
    $label = $this->wire('sanitizer')->entities($label);
    $out =  
      "<li class='ui-state-default$class'>" . 
      "<i class='itemSort fa fa-arrows fa-fw'></i> " . 
      "<span class='itemValue'>$value</span>" . 
      "<span class='itemLabel'>$label</span> " . 
      "<a class='itemRemove' href='#'><i class='fa fa-trash'></i></a>" . 
      "</li>";
    return $out; 
  }

  /**
   * Render the selected items list
   * 
   * @return string
   *
   */
  protected function ___renderList() { 

    $out = "<ol id='{$this->id}_items' data-id='{$this->id}' data-name='{$this->name}'>" . 
      $this->renderListItem("Label", "1", "itemTemplate"); 
    
    foreach($this->value as $page_id) {
      if(!$page_id) continue; 
      $page = $this->pages->get((int) $page_id); 
      if(!$page || !$page->id) continue; 
      $value = $this->labelFieldFormat ? $page->getText($this->labelFieldFormat, true, false) : $page->get($this->labelFieldName); 
      $value = strip_tags($value);
      if(!strlen($value)) $value = $page->get('title|name');
      $out .= $this->renderListItem($value, $page->id); 
    }

    $out .= "</ol>";
    return $out; 
  }

  /**
   * Render the autocompletion widget
   *
   */
  public function ___render() {
    /** @var Sanitizer $sanitizer */
    $sanitizer = $this->wire('sanitizer');

    if($this->maxSelectedItems == 1) $this->useList = false;
    $out = $this->useList ? $this->renderList() : '';
    $value = implode(',', $this->value); 
    $url = $this->getAjaxUrl();

    // convert our list of search fields to a CSV string for use in the ProcessPageSearch query
    $searchField = '';
    $searchFields = str_replace(array(',', '|'), ' ', $this->searchFields);
    foreach(explode(' ', $searchFields) as $key => $name) {
      $name = trim($name); 
      // @esrch pr#994 --
      if(strpos($name, '.')) {
        list($name, $subname) = explode('.', $name);
        $name = $sanitizer->fieldName($name);
        $subname = $sanitizer->fieldName($subname);
        if($name && $subname) $name .= "-$subname";
        // -- pr#994
      } else {
        $name = $sanitizer->fieldName($name);
      }
      if($name) $searchField .= ($searchField ? ',' : '') . $name; 
    }

    if(!$searchField) $searchField = 'title';
    $addNote = $this->_('Hit enter to add as new item'); 
    
    $labelField = $this->labelFieldFormat ? "autocomplete_$this->name" : $this->labelFieldName; 
    $operator = $this->operator; 
    $id = $this->id; 
    $max = (int) $this->maxSelectedItems; 
    $class = 'ui-autocomplete-input ' . ($this->useList ? 'has_list' : 'no_list');
    if($this->useAndWords) $class .= " and_words";
    if($this->allowAnyValue) $class .= " allow_any";
    
    $disableChars = $this->disableChars; 
    if($disableChars) {
      $hasDoubleQuote = strpos($disableChars, '"') !== false; 
      $hasSingleQuote = strpos($disableChars, "'") !== false; 
      if($hasDoubleQuote && $hasSingleQuote) {
        $this->error("disableChars cannot have both double and single quotes"); 
        $disableChars = str_replace('"', '', $disableChars); 
      }
      if($hasSingleQuote) $disableChars = "data-disablechars=\"$disableChars\" ";
        else $disableChars = "data-disablechars='$disableChars' ";
    }
    
    $attrs =
      "data-max='$max' " . 
      "data-url='" . $sanitizer->entities($url) . "' " . 
      "data-label='" . $sanitizer->entities($labelField) . "' " . 
      "data-search='$searchField' " . 
      "data-operator='$operator'";
    
    $textValue = '';
    $remove = '';
    if(!$this->useList) { 
      if(count($this->value)) {
        $item = $this->wire('pages')->getById($this->value)->first();
        if($item && $item->id) {
          $textValue = $this->labelFieldFormat ? $item->getText($this->labelFieldFormat, true, false) : $item->get($labelField);
          if(!strlen($textValue)) $textValue = $item->get('title|name');
          $textValue = strip_tags($textValue);
          if(strpos($textValue, '&') !== false) $textValue = $sanitizer->unentities($textValue);
          $textValue = $sanitizer->entities($textValue);
        }
      }
      $remove = "<i class='fa fa-fw fa-times-circle InputfieldPageAutocompleteRemove'></i>";
    }
    
    $addingLabel = $sanitizer->entities1($this->_('New item:'));
    $dataClass = $sanitizer->entities(trim('InputfieldPageAutocompleteData ' . $this->attr('class')));
    
    $out .= <<< _OUT

    <p>
    <input type='hidden' name='{$this->name}[]' id='$id' class='$dataClass' value='$value' $attrs/>
    <input type='text' data-parent-input='$id' id='{$id}_input' class='$class' value='$textValue' $disableChars/>
    <i class='fa fa-fw fa-angle-double-right InputfieldPageAutocompleteStatus'></i>
    $remove
    <span class='notes InputfieldPageAutocompleteNote' data-adding='$addingLabel'><br />$addNote</span>
    </p>
    
_OUT;
  
    /*
    <script>
    $(document).ready(function() { 
      InputfieldPageAutocomplete.init('$id', '$url', '$labelField', '$searchField', '$operator');
      console.log('initAutocomplete: $id');
    }); 
    </script>
    */
    return $out; 
  }

  /**
   * Convert the CSV string provided in the $input to an array of ints needed for this fieldtype
   * 
   * @param WireInputData $input
   * @return $this
   *
   */
  public function ___processInput(WireInputData $input) {
    
    parent::___processInput($input);
    
    $value = $this->attr('value');
    if(is_array($value)) $value = reset($value);
    $value = trim($value);
    
    if(strpos($value, ",") !== false) $value = explode(",", $value);
      else if($value) $value = array($value);
      else $value = array();
    
    foreach($value as $k => $v) {
      if(empty($v)) {
        unset($value[$k]);
      } else {
        $value[$k] = (int) $v;
      }
    }
    
    $this->attr('value', $value);
    
    return $this;
  }

  /**
   * Get the AJAX search URL that will be queried (minus the actual term)
   *
   * This URL is focused on using the AJAX API from ProcessPageSearch
   *
   */
  protected function getAjaxUrl() {

    $pipe = '%7C'; // encoded pipe "|"
    $selector = $this->findPagesSelector;   

    if($this->parent_id) {
      if($selector) {
        // if a selector was specified, AND a parent, then we'll use the parent as a root
        $selector .= ",has_parent={$this->parent_id}";
      } else {
        // otherwise matches must be direct children of the parent
        $selector = "parent_id={$this->parent_id}"; 
      }
    }

    if(count($this->template_ids)) {
      $selector .= ",templates_id=" . implode($pipe, $this->template_ids);
    } else if($this->template_id) {
      $selector .= ",templates_id={$this->template_id}";
    }
    
    if($this->lang_id) {
      $selector .= ",lang_id=" . (int) $this->lang_id;
    }
    
    $allowUnpub = $this->getSetting('allowUnpub');
    if(!is_null($allowUnpub) && !$allowUnpub) {
      $selector .= ",status<" . Page::statusUnpublished;
    }

    // allow for full site matches
    if(!strlen($selector)) $selector = "id>0";

    // match no more than 50, unless selector specifies it's own limit
    if(strpos($selector, 'limit=') === false) $selector .= ",limit=50";

    // replace non-escaped commas with ampersands
    $selector = preg_replace('/(?<!\\\\),\s*/', '&', $selector); 
    
    if(strpos($selector, '.')) {
      // replace things like children.count with children-count since "." is not allowed in URL var names
      $selector = preg_replace('/(^|&)([_a-zA-Z0-9]+)\.([_a-zA-Z0-9]+)=/', '$1$2-$3=', $selector); 
    }

    // specify what label field we want to retrieve
    if($this->labelFieldFormat) {
      $name = "autocomplete_" . $this->attr('name');
      $this->wire('modules')->get('ProcessPageSearch')->setDisplayFormat($name, $this->labelFieldFormat, true);
      $selector .= "&format_name=$name";
    }
    $selector .= "&get=" . $this->labelFieldName;

    // replace any pipes with encoded version
    if(strpos($selector, '|') !== false) $selector = str_replace('|', $pipe, $selector);
    
    return $this->config->urls->admin . "page/search/for?" . $selector;
  }

  /**
   * Install the autocomplete module
   *
   * Make sure we're in InputfieldPage's list of valid page selection widgets
   *
   */
  public function ___install() {
    $data = $this->wire('modules')->getModuleConfigData('InputfieldPage');  
    $data['inputfieldClasses'][] = $this->className();
    $this->wire('modules')->saveModuleConfigData('InputfieldPage', $data); 
  }

  /**
   * Uninstall the autocomplete module
   *
   * Remove from InputfieldPage's list of page selection widgets
   *
   */
  public function ___uninstall() {
    $data = $this->wire('modules')->getModuleConfigData('InputfieldPage');  
    foreach($data['inputfieldClasses'] as $key => $value) {
      if($value == $this->className()) unset($data['inputfieldClasses'][$key]); 
    }
    $this->wire('modules')->saveModuleConfigData('InputfieldPage', $data); 
  }

  /**
   * Provide configuration options for modifying the behavior when paired with InputfieldPage
   *
   */
  public function ___getConfigInputfields() {
    $inputfields = parent::___getConfigInputfields();

    /** @var InputfieldRadios $field */
    $field = $this->modules->get('InputfieldRadios');
    $field->setAttribute('name', 'operator');
    $field->label = $this->_('Autocomplete search operator');
    $field->description = $this->_("The search operator that is used in the API when performing autocomplete matches.");
    $field->notes = $this->_("If you aren't sure what you want here, leave it set at the default: *="); 
    $field->required = false;
    $operators = Selectors::getOperators(array(
      'compareType' => Selector::compareTypeFind, 
      'getIndexType' => 'operator', 
      'getValueType' => 'verbose', 
    ));
    foreach($operators as $operator => $info) {
      if($operator === '#=') continue;
      $opLabel = str_replace('*', '\*', $operator); 
      $field->addOption($operator, "`$opLabel` **$info[label]** — $info[description]"); 
    }
    $field->addOption('=', "`=` **" . SelectorEqual::getLabel() . "** — " . SelectorEqual::getDescription());
    $field->attr('value', $this->operator);
    $field->collapsed = Inputfield::collapsedNo; 
    $inputfields->add($field);

    /** @var InputfieldText $field */
    $field = $this->modules->get('InputfieldText'); 
    $field->attr('name', 'searchFields'); 
    $field->label = $this->_('Fields to query for autocomplete');
    $field->description = $this->_('Enter the names of the fields that should have their text queried for autocomplete matches.');
    $field->description .= ' ' . $this->_('Typically this would just be the title field, but you may add others by separating each with a space.'); 
    $field->description .= ' ' . $this->_('Note that this is different from the “label field” because you are specifying what fields will be searched, not what fields will be shown.');
    $field->collapsed = Inputfield::collapsedNo; 
    $field->attr('value', $this->searchFields);
    $notes = $this->_('Indexed text fields include:');
    foreach($this->wire('fields') as $f) {
      if(!$f->type instanceof FieldtypeText) continue; 
      $notes .= ' ' . $f->name . ','; 
    }
    $field->notes = rtrim($notes, ','); 
    $inputfields->add($field); 

    return $inputfields; 
  }
}