<?php
require_once 'config/config.php';

if (QRCODE_GENERATOR === "external-api.qrserver.com") {
    require_once BASE_PATH . '/lib/Qrcode/Qrcode.php';
}

if (QRCODE_GENERATOR === "internal-chillerlan.qrcode") {
    require_once BASE_PATH . '/lib/Qrcode/Qrcode-intchil.php';
}


class DynamicQrcode {
    private Qrcode $qrcode_instance;
    /**
     *
     */
    public function __construct() {
        $this->qrcode_instance = new Qrcode("dynamic");
    }

    /**
     *
     */
    public function __destruct() {
    }
    
    /**
     * Set friendly columns names to order tables entries
     * N.B. This function is called to generate the "list all" table
     */
    public function setOrderingValues()
    {
        $ordering = [
            'id' => 'ID',
            'id_owner' => 'Owner',
            'filename' => 'File Name',
            'identifier' => 'Identifier',
            'link' => 'Link',
            'qrcode' => 'Qr Code',
            'created_at' => 'Created at',
            'updated_at' => 'Updated at'
        ];

        return $ordering;
    }

    public function getQrcode($id) {
        return $this->qrcode_instance->getQrcode($id);
    }
    
    /**
     * Add qr code
     * Check out http://goqr.me/api/ for more information
     * We save the file obtained with the chosen name and in the selected folder
     * We save into db the url of qrcode image
     */
    public function addQrcode($input_data) {
        $this->validateLink($input_data['link'] ?? '');

        if($input_data['id_owner'] != "")
            $data_to_db['id_owner'] = $input_data['id_owner'];
        else
            $data_to_db['id_owner'] = NULL;

        $data_to_db['filename'] = htmlspecialchars($input_data['filename'], ENT_QUOTES, 'UTF-8');
        $data_to_db['created_at'] = date('Y-m-d H:i:s');
        $data_to_db['link'] = htmlspecialchars($input_data['link'], ENT_QUOTES, 'UTF-8');
        $data_to_db['created_by'] = $_SESSION['user_id'];
        $data_to_db['format'] = $input_data['format'];
        $data_to_db['identifier'] = randomString(rand(5,8));
        $data_to_db['qrcode'] = $data_to_db['filename'].'.'.$data_to_db['format'];

        $data_to_qrcode = READ_PATH.$data_to_db['identifier'];
        
        $this->qrcode_instance->addQrcode($input_data, $data_to_db, $data_to_qrcode);
    }

    /**
     * Batch-safe variant used by batch_qrcode.php: creates one dynamic qr code from a
     * CSV row (filename + link) with sane defaults, returning a result array
     * (['ok' => bool, 'id'|'error' => ...]) instead of redirecting/exiting.
     */
    public function addQrcodeBatchRow($filename, $link, $id_owner) {
        $filename = trim((string) $filename);
        $link = trim((string) $link);

        if ($filename === '') {
            return ['ok' => false, 'error' => 'Filename is required.'];
        }

        if ($link === '' || strlen($link) > 500) {
            return ['ok' => false, 'error' => 'Link is required and must be at most 500 characters.'];
        }

        $data_to_db['id_owner'] = $id_owner !== '' ? $id_owner : NULL;
        $data_to_db['filename'] = htmlspecialchars($filename, ENT_QUOTES, 'UTF-8');
        $data_to_db['created_at'] = date('Y-m-d H:i:s');
        $data_to_db['link'] = htmlspecialchars($link, ENT_QUOTES, 'UTF-8');
        $data_to_db['created_by'] = $_SESSION['user_id'];
        $data_to_db['format'] = 'png';
        $data_to_db['identifier'] = randomString(rand(5, 8));
        $data_to_db['qrcode'] = $data_to_db['filename'].'.'.$data_to_db['format'];

        $data_to_qrcode = READ_PATH.$data_to_db['identifier'];

        $input_data = [
            'level' => 'L',
            'size' => 200,
            'foreground' => '#000000',
            'background' => '#ffffff',
            'frame_text' => '',
        ];

        return $this->qrcode_instance->addQrcodeBatch($input_data, $data_to_db, $data_to_qrcode);
    }

    /**
     * Edit qr code
     *
     */
    public function editQrcode($input_data) {
        $this->validateLink($input_data['link'] ?? '');

        if($input_data['id_owner'] != "")
            $data_to_db['id_owner'] = $input_data['id_owner'];
        else
            $data_to_db['id_owner'] = NULL;
        $data_to_db['filename'] = htmlspecialchars($input_data['filename'], ENT_QUOTES, 'UTF-8');
        $data_to_db['created_at'] = date('Y-m-d H:i:s');
        $data_to_db['link'] = htmlspecialchars($input_data['link'], ENT_QUOTES, 'UTF-8');
        $data_to_db['state'] = $input_data['state'];

        $this->qrcode_instance->editQrcode($input_data, $data_to_db);
    }

    
    /**
     * Delete qr code
     * 
     */
    public function deleteQrcode($id, $async = false) {
        if($_SESSION['type'] === "super") {
            $this->qrcode_instance->deleteQrcode($id, $async);
        } else if ($_SESSION['type'] === "admin") {
            $qrcode = $this->getQrcode($id);

            if(!isset($qrcode["id_owner"]))
                $this->failure("You cannot delete this qrcode");

            require_once BASE_PATH . '/lib/Users/Users.php';
            $users = new Users();
            $user = $users->getUser($_SESSION['user_id']);

            if($user["id"] === $qrcode["id_owner"])
                $this->qrcode_instance->deleteQrcode($id, $async);
            else
                $this->failure("You cannot delete this qrcode because it's of another user");
        }
    }


    /**
     * Server-side validatie van de redirect-link (verplicht, max. 500 tekens per kolomdefinitie).
     */
    private function validateLink($link) {
        $link = trim((string) $link);

        if ($link === '' || strlen($link) > 500) {
            $this->failure('Link is required and must be at most 500 characters.');
        }
    }

    /**
     * Flash message Failure process
     */
    private function failure($message) {
        $_SESSION['failure'] = $message;
        header('Location: dynamic_qrcodes.php');
    	exit();
    }
    
    /**
     * Flash message Success process
     */
    private function success($message) {
        $_SESSION['success'] = $message;
        header('Location: dynamic_qrcodes.php');
    	exit();
    }
    
    /**
     * Flash message Info process
     */
    private function info($message) {
        $_SESSION['info'] = $message;
        header('Location: dynamic_qrcodes.php');
    	exit();
    }

    public function debug($data) {
        echo '<pre>' . var_export($data, true) . '</pre>';
        exit();
    }
}
?>