<?php

namespace CORE\services;

use CORE\dao\FormDao;
use \Slim\Container;

class FormBuilderService
{
    private $_Form;
    private $_Types = [];
    private $_ElementNames = [];
    private $_ChildrenStructs = [];
    private $_InvisibleElements = [];
    private $_ValidationTypes = [];
    private $breakElements = true;
    private $_UserForm;

    public function __construct(Container $container, FormDao $formDao)
    {
        $form = $formDao->GetAllForms();
        $this->_Form = $form;
    }

    public function BuildUserForm($formInput){
        $form = $this->_Form;
        $userForm = $formInput;

        $this->_UserForm = $userForm;
        foreach($userForm as $formInput){
            $this->BuildUserFormNested($form, $formInput);
        }

        return $form;

    }

    private function BuildUserFormNested(&$array, &$arrayToCompare, $nestedChild = 0)
    {
        if($nestedChild == 1){
            foreach($array as &$child){
                foreach ($child as &$nestedChild){
                    foreach($this->_UserForm as $userForm){
                        if($nestedChild['name'] === $userForm['name']){
                            $nestedChild['value'] = $userForm['value'];
                        }
                    }
                }
            }
        }

        foreach ($array as $section => &$element) {
            foreach ($element as &$child) {
                if ($child['name'] === $arrayToCompare['name']) {
                    if (isset($child['children'])) {
                        if(isset($child['children']['checked'])){
                            $this->BuildUserFormNested($child['children'], $arrayToCompare, 1);
                        }
                        else{
                            $child['value'] = $arrayToCompare['value'];
                        }
                    } else {
                        $child['value'] = $arrayToCompare['value'];
                    }
                }
            }
        }
    }

    private function GenerateEnvironment($array)
    {
        foreach ($array as $element) {
            if (isset($element['type']) and !in_array($element['type'], $this->_Types)) {
                array_push($this->_Types, $element['type']);
            }
            if (isset($element['name']) and !in_array($element['name'], $this->_ElementNames)) {
                array_push($this->_ElementNames, $element['name']);
            }
            if (isset($element['children'])) {
                $this->_ChildrenStructs[$element['name']] = $element['children'];
            }
            if (isset($element['validation'])) {
                $this->_ValidationTypes[$element['name']] = $element['validation'];
            } elseif (is_array($element)) {
                $this->GenerateEnvironment($element);
            }
        }
    }

    public function BuildSection(...$singleSection)
    {
        $result = $this->_Form;

        if (is_string($result)) {
            return $result;
        }

        $formHTML = "";

        $this->GenerateEnvironment($result);

        if(func_num_args() >= 1){
            foreach($singleSection as $sectionName){
                foreach ($result as $section => &$item){
                    if($section == $sectionName){
                        $formHTML .= $this->BuildForm($item, true, $section);
                    }
                }
            }
        } else{
            $formHTML .= $this->BuildForm($result);
        }

        return $formHTML;
    }

    private function BuildForm($array, $singleSection = false, $parent = null){

        $formHTML = "";

        if($singleSection === true){
            $formHTML .= '<div class="form-group" data-section="' . $parent . '">' . '<h1>' . $parent . '</h1>';
            foreach($array as $sectionItem){
                $formHTML .= $this->BuildElements($sectionItem);
                if ($this->breakElements) {
                    $formHTML .= '<br>';
                }
            }
            $formHTML .= '</div>';
        } else{
            foreach ($array as $section => $item) {
                $formHTML .= '<div class="form-group" data-section="' . $section . '">' .
                    '<h1>' . $section . '</h1>';
                foreach ($item as $formElement) {
                    $formHTML .=
                        $this->BuildElements($formElement);
                    if ($this->breakElements) {
                        $formHTML .= '<br>';
                    }
                }
                $formHTML .= '</div>';
            }
        }

        return $formHTML;
    }

    private function BuildElements($array)
    {
        $formHTML = "";

        if ($array['type'] === 'dropdown') {
            $formHTML .= $this->BuildDropdowns($array);
        } else {
            $formHTML .= $this->BuildInputs($array);
        }

        if (isset($array['children']['checked'])) {
            $formHTML .= $this->BuildVisibility($array['name'], $array);
        }

        return $formHTML;
    }

    private function BuildDeepChildren($array, $parent)
    {
        $html = "";
        foreach ($array as $child) {
            $html .= $this->BuildElements($child);
            if (isset($child['children'])) {
                $this->BuildDeepChildren($child['children'], $child['name']);
            }
        }

        return $html;
    }

    private function BuildInputs($array)
    {
        $html = "";
        $html .=
            (isset($array['name']) ? '<label for=' . $array['name'] . '>' . $array['title'] . '</label>' : "");
            if($array['type'] == 'checkbox'){
                $html .= '<br><input class="form-check-input"';
            } else{
                $html .= '<br><input class="form-control"';
            }
            $html .= (isset($array['name']) ? ' name=' . $array['name'] . ' id=' . $array['name'] : "") .
            (isset($array['type']) ? ' type=' . $array['type'] : "") .
            (isset($array['placeholder']) ? ' placeholder="' . $array['placeholder'] . '"' : "") .
            (isset($array['minimum']) ? ' min=' . $array['minimum'] : "") .
            (isset($array['maximum']) ? ' max=' . $array['maximum'] : "") .
            (isset($array['validation']) ? ' data-validate=' . $array['validation'] : "") .
            (isset($array['required']) ? ' required' : "") .
            '>';
        return $html;
    }

    private function BuildDropdowns($children)
    {
        $html = "";
        $html .= '<label for="' . $children['name'] . '">' . $children['name'] . '</label>' .
                 '<select id=' . $children['name'] . ' name=' . $children['name'] . ' class="form-control">';
        foreach ($children['children'] as $child) {
            switch ($child['type']) {
                case 'option':
                    $html .= $this->BuildOptions($child);
                    break;
            }
        }
        $html .= '</select>';
        return $html;
    }

    private function BuildOptions($array)
    {
        $html = "";
        $html .= '<option ' .
            (isset($array['name']) ? ' value=' . $array['name'] : "") .
            (isset($array['default']) ? ' selected=' . $array['title'] : "") .
            '>' .
            (isset($array['title']) ? $array['title'] : $array['name']) .
            '</option>';
        return $html;
    }

    private function BuildVisibility($name, $arrayObject)
    {

        $html = "";
        $visibility = $arrayObject['default'];
        $this->_InvisibleElements[$name] = array('default' => $arrayObject['default'], 'parent' => $name, 'children' => $arrayObject['children']);

        switch ($visibility) {
            case 1:
                $html .= '<div class="checkbox" style="display: block" id=' . $name . '-checked' . '>' .
                    $this->BuildDeepChildren($arrayObject['children']['checked'], $name) .
                    '</div>' .
                    '<div class="checkbox" style="display: none" id=' . $name . '-unchecked' . '>' .
                    $this->BuildDeepChildren($arrayObject['children']['unchecked'], $name) .
                    '</div>';
                break;
            case 0:
                $html .= '<div class="checkbox" style="display: block" id=' . $name . '-unchecked' . '>' .
                    $this->BuildDeepChildren($arrayObject['children']['unchecked'], $name) .
                    '</div>' .
                    '<div class="checkbox" style="display: none" id=' . $name . '-checked' . '>' .
                    $this->BuildDeepChildren($arrayObject['children']['checked'], $name) .
                    '</div>';
                break;
        }

        return $html;

    }

    public function ConfigureCheckboxDefaults()
    {
        $html = "";
        foreach ($this->_InvisibleElements as $element => $values) {
            $default = $values['default'] ? true : false;
            $html .= 'CheckedElement("' . $element . '-checked' . '", "' . $element . '-unchecked' . '","' . $values['parent'] . '","' . $default . '");';
        }
        return $html;
    }

    public function GetValidationTypes()
    {
        return $this->_ValidationTypes;
    }
}