<?php

    /**
     * Uguu
     *
     * @copyright Copyright (c) 2022 Go Johansson (nokonoko) <neku@pomf.se>
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU General Public License as published by
     * the Free Software Foundation, either version 3 of the License, or
     * (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program.  If not, see <https://www.gnu.org/licenses/>.
     */

    namespace Pomf\Uguu\Classes;

class Response
{
    public string $type;

    /**
     * Takes a string as an argument and sets the header to the appropriate content type
     *
     * @param $response_type string The type of response you want to return.
     *                       Valid options are: csv, html, json, text.
     */
    public function __construct(string $response_type)
    {
        switch ($response_type) {
            case 'csv':
                header('Content-Type: text/csv; charset=UTF-8');
                $this->type = $response_type;
                break;
            case 'html':
                header('Content-Type: text/html; charset=UTF-8');
                $this->type = $response_type;
                break;
            case 'json':
                header('Content-Type: application/json; charset=UTF-8');
                $this->type = $response_type;
                break;
            case 'gyazo':
                header('Content-Type: text/plain; charset=UTF-8');
                $this->type = 'text';
                break;
            case 'text':
                header('Content-Type: text/plain; charset=UTF-8');
                $this->type = $response_type;
                break;
            default:
                header('Content-Type: application/json; charset=UTF-8');
                $this->type = 'json';
                break;
        }
    }

    /**
     * Returns a string based on the type of response requested
     *
     * @param $code mixed The HTTP status code to return.
     * @param $desc string The description of the error.
     */
    public function error(int $code, string $desc): void
    {
        $response = match ($this->type) {
            'csv' => $this->csvError($desc),
            'html' => $this->htmlError($code, $desc),
            'json' => $this->jsonError($code, $desc),
            'text' => $this->textError($code, $desc),
        };
            http_response_code($code);
            echo $response;
    }

    /* Returning a string that contains the error message. */
    private static function csvError(string $description): string
    {
        return '"error"' . "\r\n" . "\"$description\"" . "\r\n";
    }

    /**
     * Returns a string containing an HTML paragraph element with the error code and description
     *
     * @param $code        int|string The error code.
     * @param $description string The description of the error.
     *
     * @return string A string.
     */
    private static function htmlError(int|string $code, string $description): string
    {
        return '<p>ERROR: (' . $code . ') ' . $description . '</p>';
    }

    /**
     * Returns a JSON string with the error code and description
     *
     * @param $code        int|string The error code.
     * @param $description string The description of the error.
     *
     * @return bool|string A JSON string
     */
    private static function jsonError(int|string $code, string $description): bool|string
    {
        return json_encode([
           'success'     => false,
           'errorcode'   => $code,
           'description' => $description,
        ], JSON_PRETTY_PRINT);
    }

    /**
     * Returns a string that contains the error code and description
     *
     * @param $code        int|string The error code.
     * @param $description string The description of the error.
     *
     * @return string A string with the error code and description.
     */
    private static function textError(int|string $code, string $description): string
    {
        return 'ERROR: (' . $code . ') ' . $description;
    }

    /**
     * "If the type is csv, then call the csvSuccess function,
     * if the type is html, then call the htmlSuccess function, etc."
     *
     * The `match` keyword is a new feature in PHP 8. It's a lot like a switch statement, but it's more powerful
     *
     * @param $files array An array of file objects.
     */
    public function send(array $files): void
    {
        $response = match ($this->type) {
            'csv' => $this->csvSuccess($files),
            'html' => $this->htmlSuccess($files),
            'json' => $this->jsonSuccess($files),
            'text' => $this->textSuccess($files),
        };
            http_response_code(200); // "200 OK". Success.
            echo $response;
    }

    /**
     * Takes an array of files and returns a CSV string
     *
     * @param $files array An array of files that have been uploaded.
     *
     * @return string A string of the files in the array.
     */
    private static function csvSuccess(array $files): string
    {
        $result = '"name","url","hash","size"' . "\r\n";
        foreach ($files as $file) {
            $result .= '"' . $file['name'] . '"' . ',' .
               '"' . $file['url'] . '"' . ',' .
               '"' . $file['hash'] . '"' . ',' .
               '"' . $file['size'] . '"' . "\r\n";
        }
        return $result;
    }

    /**
     * Takes an array of files and returns a string of HTML links
     *
     * @param $files array An array of files to be uploaded.
     *
     * @return string the result of the foreach loop.
     */
    private static function htmlSuccess(array $files): string
    {
        $result = '';
        foreach ($files as $file) {
            $result .= '<a href="' . $file['url'] . '">' . $file['url'] . '</a><br>';
        }
        return $result;
    }

    /**
     * Returns a JSON string that contains a success message and the files that were uploaded
     *
     * @param $files array The files to be uploaded.
     *
     * @return bool|string A JSON string
     */
    private static function jsonSuccess(array $files): bool|string
    {
        return json_encode([
           'success' => true,
           'files'   => $files,
        ], JSON_PRETTY_PRINT);
    }

    /**
     * Takes an array of files and returns a string of URLs
     *
     * @param $files array The files to be uploaded.
     *
     * @return string the url of the file.
     */
    private static function textSuccess(array $files): string
    {
        $result = '';
        foreach ($files as $file) {
            $result .= $file['url'] . "\n";
        }
        return $result;
    }
}
