<?php

use EventEspresso\core\exceptions\InvalidDataTypeException;
use EventEspresso\core\exceptions\InvalidInterfaceException;
use EventEspresso\core\libraries\rest_api\ModelDataTranslator;
use EventEspresso\core\services\loaders\LoaderFactory;

/**
 * EE_Select_Ajax_Model_Rest_Input
 * select input which uses ajax and the EE4 REST API to access the EE4 models
 * for options, and
 *
 * @package         Event Espresso
 * @subpackage
 * @author              Mike Nelson
 */
class EE_Select_Ajax_Model_Rest_Input extends EE_Form_Input_With_Options_Base
{

    /**
     * @var string $_model_name
     */
    protected $_model_name;

    /**
     * @var string $_display_field_name
     */
    protected $_display_field_name;

    /**
     * @var string $_value_field_name
     */
    protected $_value_field_name;

    /**
     * @var array $_extra_select_columns
     */
    protected $_extra_select_columns = array();


    /**
     * @param array $input_settings     {
     * @type string $model_name         the name of model to be used for searching, both via the REST API and server-side model queries
     * @type array  $query_params       default query parameters which will apply to both REST API queries and server-side queries. This should be
     *                                  in the exact format that will be used for server-side model usage (eg use index 0 for where conditions, not
     *                                  the string "where")
     * @type string $value_field_name   the name of the model field on this model to
     *                                  be used for the HTML select's option's values
     * @type string $display_field_name the name of the model field on this model
     *                                  to be used for the HTML select's option's display text
     * @type array  $select2_args       arguments to be passed directly into the select2's JS constructor
     *                                  }
     *                                  And the arguments accepted by EE_Form_Input_With_Options_Base
     * }
     * @throws EE_Error
     * @throws InvalidArgumentException
     * @throws InvalidDataTypeException
     * @throws InvalidInterfaceException
     */
    public function __construct($input_settings = array())
    {
        // needed input settings:
        // select2_args
        $this->_model_name = EEH_Array::is_set(
            $input_settings,
            'model_name',
            null
        );
        $model = $this->_get_model();
        $query_params = EEH_Array::is_set(
            $input_settings,
            'query_params',
            array()
        );
        // make sure limit and caps are always set
        $query_params = array_merge(
            array( 'limit' => 10, 'caps' => EEM_Base::caps_read_admin ),
            $query_params
        );
        $this->_value_field_name = EEH_Array::is_set(
            $input_settings,
            'value_field_name',
            $model->primary_key_name()
        );
        $this->_display_field_name = EEH_Array::is_set(
            $input_settings,
            'display_field_name',
            $model->get_a_field_of_type('EE_Text_Field_Base')->get_name()
        );
        $this->_extra_select_columns = EEH_Array::is_set(
            $input_settings,
            'extra_select_columns',
            array()
        );
        $this->_add_validation_strategy(
            new EE_Model_Matching_Query_Validation_Strategy(
                '',
                $this->_model_name,
                $query_params,
                $this->_value_field_name
            )
        );
        // get resource endpoint
        $rest_controller = LoaderFactory::getLoader()->getNew(
            'EventEspresso\core\libraries\rest_api\controllers\model\Read'
        );
        $rest_controller->setRequestedVersion(EED_Core_Rest_Api::latest_rest_api_version());
        $default_select2_args = array(
            'ajax' => array(
                'url' => $rest_controller->getVersionedLinkTo(
                    EEH_Inflector::pluralize_and_lower($this->_model_name)
                ),
                'dataType' => 'json',
                'delay' => '250',
                'data_interface' => 'EE_Select2_REST_API_Interface',
                'data_interface_args' => array(
                    'default_query_params' => (object) ModelDataTranslator::prepareQueryParamsForRestApi(
                        $query_params,
                        $model
                    ),
                    'display_field' => $this->_display_field_name,
                    'value_field' => $this->_value_field_name,
                    'nonce' => wp_create_nonce('wp_rest'),
                    'locale' => str_replace('_', '-', strtolower(get_locale()))
                ),
            ),
            'cache' => true,
            'width' => 'resolve'
        );
        $select2_args = array_replace_recursive(
            $default_select2_args,
            (array) EEH_Array::is_set($input_settings, 'select2_args', array())
        );
        $this->set_display_strategy(new EE_Select2_Display_Strategy($select2_args));
        parent::__construct(array(), $input_settings);
    }



    /**
     * Before setting the raw value (usually because we're setting the default,
     * or we've received a form submission and this might be re-displayed to the user),
     * sets the options so that the current selections appear on initial display.
     *
     * Note: because this input uses EE_Model_Matching_Query_Validation_Strategy
     * for validation, this input's options only affect DISPLAY and NOT validation,
     * which is why its ok to just assume the provided $value to be in the list of acceptable values
     *
     * @param mixed $value
     * @return void
     * @throws \EE_Error
     */
    public function _set_raw_value($value)
    {
        $values_for_options = (array) $value;
        $value_field = $this->_get_model()->field_settings_for($this->_value_field_name);
        $display_field = $this->_get_model()->field_settings_for($this->_display_field_name);
        $this->_extra_select_columns[] = $value_field->get_qualified_column() . ' AS ' . $this->_value_field_name;
        $this->_extra_select_columns[] = $display_field->get_qualified_column() . ' AS ' . $this->_display_field_name;
        $display_values = $this->_get_model()->get_all_wpdb_results(
            array(
                array(
                    $this->_value_field_name => array( 'IN', $values_for_options )
                )
            ),
            ARRAY_A,
            implode(',', $this->_extra_select_columns)
        );
        $select_options = array();
        if (is_array($select_options)) {
            foreach ($display_values as $db_rows) {
                $db_rows = (array) $db_rows;
                $select_options[ $db_rows[ $this->_value_field_name ] ] = apply_filters(
                    'FHEE__EE_Select_Ajax_Model_Rest_Input___set_raw_value__select_option_value',
                    $db_rows[ $this->_display_field_name ],
                    $db_rows
                );
            }
        }
        $this->set_select_options($select_options);
        parent::_set_raw_value($value);
    }

    /**
     * Returns the model, or throws an exception if the model name provided in constructor doesn't exist
     * @return EEM_Base
     * @throws EE_Error
     */
    protected function _get_model()
    {
        if (! EE_Registry::instance()->is_model_name($this->_model_name)) {
            throw new EE_Error(
                sprintf(
                    __(
                        '%1$s is not a proper model name. Please provide a model name in the "model_name" form input argument',
                        'event_espresso'
                    ),
                    $this->_model_name
                )
            );
        } else {
            return EE_Registry::instance()->load_model($this->_model_name);
        }
    }
}
