<?php
namespace Vietswiss;

defined( 'ABSPATH' ) or die( 'Direct script access disallowed.' );

class Settings
{
    
    private $options, $modules, $init;

    public function __construct()
    {
        $this->init = false;
        $this->modules = getModules();

        if(!is_admin() && !isset($_POST['vietswiss_save']))
        {
          return;  
        }

        $this->initOptions();
        $this->handlePost();
        add_action( 'admin_menu', array( $this, 'add_plugin_page' ) );
    }

    public function handlePost()
    {
        if(!isset($_POST['vietswiss_save']))
        {
            return;
        }

        $inputs = $_POST;
        unset($inputs['vietswiss_save']);

        foreach($inputs as $inputName => $input)
        {
            $nameSplit = explode('_', $inputName);
            $section = array_shift($nameSplit);
            $slug = implode('_', $nameSplit);

            if(!isset($this->options[$section]) || !isset($this->options[$section][$slug]))
            {
                continue;
            }

            if($this->options[$section][$slug]['type'] === 'file'){

                // validate json
                $json = json_decode($input, true);
                if($json === null){
                    continue;
                }
                file_put_contents($this->options[$section][$slug]['value'], json_encode($json,JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
                continue;
            }


            $this->options[$section][$slug]['value'] = $this->sanitizeInput($input, $this->options[$section][$slug]['type']);
        }


        $this->saveOptions();

    }

    public function getOption($section, $input){
        if(!$this->init){
            $this->initOptions();
        }
        if(isset($this->options[$section][$input])){
            return $this->options[$section][$input]['value'];
        }
        return null;
    }


    public function sanitizeInput($input, $type)
    {
        switch($type)
        {
            case 'boolean':
                return $input === 'yes' ? '1' : '0';
            break;
            case 'number':
                return intval($input);
            break;
            default:
                return strval($input);
            break;
        }
    }

    public function saveOptions()
    {
        update_option('vietswiss_settings', $this->options);
    }

    public function initOptions()
    {

        $this->options = get_option( 'vietswiss_settings' );

        $configTree = [];

        if(!is_array($this->options))
        {
            $this->options = [];
        }

        foreach($this->modules as $module)
        {

            foreach($module->getOptions() as $option)
            {

                if(!isset($this->options[$option->getSection()]))
                {
                    $this->options[$option->getSection()] = [];
                }
                
                if(!isset($configTree[$option->getSection()]))
                {
                    $configTree[$option->getSection()] = [];
                }

                $configTree[$option->getSection()][] = $option->getSlug();

                if(isset($this->options[$option->getSection()][$option->getSlug()]))
                {
                    $oldOptionValue = $this->options[$option->getSection()][$option->getSlug()]['value'];
                    $this->options[$option->getSection()][$option->getSlug()] = ['name' => $option->getName(), 'type' => $option->getType() , 'value' => $oldOptionValue];
                }else
                {
                    $this->options[$option->getSection()][$option->getSlug()] = ['name' => $option->getName(), 'type' => $option->getType() , 'value' => $option->getDefault()];
                }
            }
            
        }

        foreach($this->options as $section => $elements)
        {
            if(!isset($configTree[$section]))
            {
                unset($this->options[$section]);
                continue;
            }
            foreach($elements as $elementSlug => $_)
            {
                if(!in_array($elementSlug, $configTree[$section]))
                {
                    unset($this->options[$section][$elementSlug]);
                }
            }

        } 

        
        $this->init = true;
        $this->saveOptions();

    }

    /**
     * Add options page
     */
    public function add_plugin_page()
    {
        // This page will be under "Settings"
        add_menu_page(
            'Fasoon Mutation Form', 
            'Mutation From Plugin', 
            'manage_options', 
            'vietswiss-admin', 
            array( $this, 'create_admin_page' )
        );
    }

    public function create_admin_page()
    {
        $this->initOptions();

        ?>
        <div class="wrap">
            <h1>Fasoon Mutation Form Plugin</h1>
            <form method="POST">
            <?php
            foreach($this->options as $sectionName => $section)
            {
                echo "<h2>{$sectionName}</h2><div style='display: grid; grid-template-columns: 1fr 4fr; grid-row-gap: 15px;'>";

                foreach($section as $optionSlug => $option)
                {
                   $this->printField($option['name'], $sectionName.'_'.$optionSlug, $option['value'], $option['type']);
                }

                echo "</div>";
            }
            ?>
                <br/>
                <input 
                style="
                    border-radius: 10px;
                    width: 300px;
                    margin-top: 30px;
                    padding-top: 10px;
                    padding-bottom: 10px;
                    color: white;
                    font-weight: bold;
                    background-color: #117DC2;
                "
                type="submit" name="vietswiss_save" value="Speichern" />
            </form>
        </div>
        <?php
    }

    public function printField($name, $slug, $value, $type)
    {
        switch($type)
        {
            case 'boolean':
                echo $this->booleanFieldTemplate($name, $slug, $value);
            break;
            case 'number':
                echo $this->numberFieldTemplate($name, $slug, $value);
            break;
            case 'file':
                echo $this->fileFieldTemplate($name, $slug, $value);
            break;
            default:
                echo $this->textFieldTemplate($name, $slug, $value);
            break;
        }
    }

    public function booleanFieldTemplate($name, $slug, $value) : string 
    {
        return "<label 
        style='font-weight: bold; width: 30vw;' 
        for='vietswiss-{$slug}' >
            {$name}
        </label>
        <input type='hidden' name='{$slug}' value='no' />
        <input id='vietswiss-{$slug}' type='checkbox' name='{$slug}' value='yes' ". ($value === true || $value == '1'  ? 'checked' : '') ." />";
    }

    public function numberFieldTemplate($name, $slug, $value) : string 
    {
        return "<label 
        style='font-weight: bold; width: 30vw;' 
        for='vietswiss-{$slug}' >
            {$name}
        </label>
        <input id='vietswiss-{$slug}' type='number' name='{$slug}' value='{$value}' />";
    }

    public function fileFieldTemplate($name, $slug, $value) : string 
    {
        $content = file_get_contents($value);
        return "<label 
        style='font-weight: bold; width: 30vw;' 
        for='vietswiss-{$slug}' >
            {$name}
        </label>
        <textarea rows='20' id='vietswiss-{$slug}' name='{$slug}''>{$content}</textarea>";
    }

    public function textFieldTemplate($name, $slug, $value) : string
    {
        return "<label 
        style='font-weight: bold; width: 30vw;' 
        for='vietswiss-{$slug}' >
            {$name}
        </label>
        <input id='vietswiss-{$slug}' type='text' name='{$slug}' value='{$value}' />";
    }

}