<?php

namespace App\Actions\Environments;

use App\Models\Environment;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Process;
use RuntimeException;

class ResolveEnvironmentCommit
{
    public function execute(Environment $environment): string
    {
        $environment->loadMissing('application');

        $application = $environment->application;

        if (! $application->deploy_key_private) {
            throw new RuntimeException('Application does not have a deploy key.');
        }

        $directory = storage_path('app/private/operations/resolve-'.$environment->id.'-'.str()->random(8));
        $keyPath = $directory.'/deploy_key';

        File::ensureDirectoryExists($directory, 0700);
        File::put($keyPath, $application->deploy_key_private);
        File::chmod($keyPath, 0600);

        try {
            $result = Process::path($directory)
                ->env([
                    'GIT_SSH_COMMAND' => 'ssh -i '.$keyPath.' -o IdentitiesOnly=yes -o StrictHostKeyChecking=no',
                ])
                ->run([
                    'git',
                    'ls-remote',
                    $application->repository_url,
                    'refs/heads/'.$environment->branch,
                ]);

            if ($result->failed()) {
                throw new RuntimeException(trim($result->errorOutput()) ?: 'Unable to resolve environment commit.');
            }

            return $this->commitFromOutput($result->output(), $environment->branch);
        } finally {
            rescue(fn () => File::deleteDirectory($directory), report: false);
        }
    }

    private function commitFromOutput(string $output, string $branch): string
    {
        $commit = str($output)->before("\t")->trim()->value();

        if (preg_match('/^[a-f0-9]{40}$/i', $commit) !== 1) {
            throw new RuntimeException("Unable to resolve commit for branch {$branch}.");
        }

        return strtolower($commit);
    }
}