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<?php

/**
 * This file is part of CaptainHook
 *
 * (c) Sebastian Feldmann <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace CaptainHook\App\Hook\Condition;

use CaptainHook\App\Console\IO;
use CaptainHook\App\Git\ChangedFiles\Detector\Factory;
use CaptainHook\App\Hook\Restriction;
use CaptainHook\App\Hooks;
use SebastianFeldmann\Git\Repository;

/**
 * Class FileChange
 *
 * @package CaptainHook
 * @author  Sebastian Feldmann <[email protected]>
 * @link    https://github.com/captainhookphp/captainhook
 * @since   Class available since Release 4.2.0
 */
abstract class FileChanged extends File
{
    /**
     * List of file to watch
     *
     * @var array<string>
     */
    protected array $filesToWatch;

    /**
     * Git filter options
     *
     * @var array<string>
     */
    private array $filter;

    /**
     * FileChange constructor
     *
     * @param array<string> $files
     * @param string $filter
     */
    public function __construct(array $files, string $filter = 'ACMR')
    {
        $this->filesToWatch = $files;
        $this->filter       = !empty($filter) ? str_split($filter) : [];
    }

    /**
     * Return the hook restriction information
     *
     * @return \CaptainHook\App\Hook\Restriction
     */
    public static function getRestriction(): Restriction
    {
        return Restriction::fromArray([Hooks::PRE_PUSH, Hooks::POST_CHECKOUT, Hooks::POST_MERGE, Hooks::POST_REWRITE]);
    }

    /**
     * Evaluates a condition
     *
     * @param  \CaptainHook\App\Console\IO       $io
     * @param  \SebastianFeldmann\Git\Repository $repository
     * @return bool
     */
    abstract public function isTrue(IO $io, Repository $repository): bool;

    /**
     * Use 'diff-tree' to find the changed files after this merge or checkout
     *
     * In case of a checkout it is easy because the arguments 'previousHead' and 'newHead' exist.
     * In case of a merge determining this hashes is more difficult, so we are using the 'ref-log'
     * to do it and using 'HEAD@{1}' as the last position before the merge and 'HEAD' as the
     * current position after the merge.
     *
     * @param  \CaptainHook\App\Console\IO       $io
     * @param  \SebastianFeldmann\Git\Repository $repository
     * @return array<string>
     */
    protected function getChangedFiles(IO $io, Repository $repository): array
    {
        $factory  = new Factory();
        $detector = $factory->getDetector($io, $repository);

        return $detector->getChangedFiles($this->filter);
    }
}