<?php
/**
 * Class EE_Select_Reveal_Input
 *
 * Generates an HTML <select> form input, which, when selected, will reveal
 * a sibling subsections whose names match the array keys of the $answer_options
 *
 * @package             Event Espresso
 * @subpackage  core
 * @author              Mike Nelson
 * @since               4.6
 *
 */
class EE_Select_Reveal_Input extends EE_Select_Input
{

    /**
     * @param array $answer_options Array keys which match a sibling section's name
     *              will show/unhide that sibling subsection. Otherwise, siblings whose names
     *              match array keys of $answer_options are hidden.
     *              Note: internally each array key is considered a relative form input path
     *              (see EE_Form_Section_Base::find_section_from_path) but relative
     *              to THIS INPUT's PARENT section, not this input itself. ie,
     *              a '../' is automatically added onto each each array key, to produce
     *              the relative form input path.
     *              Note however: array keys which are an EMPTY STRING are left as-is
     *
     * @param array $input_settings
     */
    public function __construct($answer_options, $input_settings = array())
    {
        parent::__construct($answer_options, $input_settings);
    }

    /**
     * Gets all the sibling sections controlled by this reveal select input
     * @return \EE_Form_Section_Base[] keys are their form section paths
     */
    public function sibling_sections_controlled()
    {
        $sibling_sections = array();
        foreach ($this->options() as $sibling_section_name => $sibling_section) {
            // if it's an empty string just leave it alone
            if (empty($sibling_section_name)) {
                continue;
            }
            $sibling_section = $this->find_section_from_path('../' . $sibling_section_name);
            if ($sibling_section instanceof EE_Form_Section_Base
                && ! empty($sibling_section_name)
            ) {
                $sibling_sections[ $sibling_section_name ] = $sibling_section;
            }
        }
        return $sibling_sections;
    }

    /**
     * Adds an entry of 'select_reveal_inputs' to the js data, which is an array
     * whose top-level keys are select reveal input html ids; values are arrays
     * whose keys are select option values and values are the sections they reveal
     * @param array $form_other_js_data
     * @return array
     */
    public function get_other_js_data($form_other_js_data = array())
    {
        $form_other_js_data = parent::get_other_js_data($form_other_js_data);
        if (! isset($form_other_js_data['select_reveal_inputs'])) {
            $form_other_js_data['select_reveal_inputs'] = array();
        }
        $sibling_input_to_html_id_map = array();
        foreach ($this->sibling_sections_controlled() as $sibling_section_path => $sibling_section) {
            $sibling_input_to_html_id_map[ $sibling_section_path ] = $sibling_section->html_id();
        }
        $form_other_js_data['select_reveal_inputs'][ $this->html_id() ] = $sibling_input_to_html_id_map;
        return $form_other_js_data;
    }
}
