<?php

declare(strict_types=1);

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\Format;

use CodeIgniter\Format\Exceptions\FormatException;
use Config\Format as FormatConfig;

/**
 * The Format class is a convenient place to create Formatters.
 *
 * @see \CodeIgniter\Format\FormatTest
 */
class Format
{
    /**
     * Configuration instance
     *
     * @var FormatConfig
     */
    protected $config;

    /**
     * Constructor.
     */
    public function __construct(FormatConfig $config)
    {
        $this->config = $config;
    }

    /**
     * Returns the current configuration instance.
     *
     * @return FormatConfig
     */
    public function getConfig()
    {
        return $this->config;
    }

    /**
     * A Factory method to return the appropriate formatter for the given mime type.
     *
     * @throws FormatException
     */
    public function getFormatter(string $mime): FormatterInterface
    {
        if (! array_key_exists($mime, $this->config->formatters)) {
            throw FormatException::forInvalidMime($mime);
        }

        $className = $this->config->formatters[$mime];

        if (! class_exists($className)) {
            throw FormatException::forInvalidFormatter($className);
        }

        $class = new $className();

        if (! $class instanceof FormatterInterface) {
            throw FormatException::forInvalidFormatter($className);
        }

        return $class;
    }
}
