<?php

namespace Modules\Stylist\Services;

use Illuminate\Filesystem\Filesystem;
use Illuminate\Http\UploadedFile;
use Modules\Stylist\Theme\Loader;
use Modules\Stylist\Theme\Theme;
use RuntimeException;
use ZipArchive;

final class ThemePackageManager
{
    public function __construct(private readonly Filesystem $files, private readonly Loader $loader, private readonly ThemeValidator $validator) {}

    public function install(UploadedFile $upload): Theme
    {
        if (strtolower($upload->getClientOriginalExtension()) !== 'zip') throw new RuntimeException('Only ZIP theme packages may be installed.');
        $temporary = storage_path('app/stylist/install-'.bin2hex(random_bytes(8)));
        $this->files->ensureDirectoryExists($temporary);
        $zip = new ZipArchive();
        if ($zip->open($upload->getRealPath()) !== true) throw new RuntimeException('The uploaded ZIP could not be opened.');
        for ($i=0; $i<$zip->numFiles; $i++) {
            $name = $zip->getNameIndex($i);
            if (str_contains($name, '..') || str_starts_with($name, '/') || str_contains($name, "\0")) { $zip->close(); throw new RuntimeException('The ZIP contains an unsafe path.'); }
        }
        $zip->extractTo($temporary); $zip->close();
        $manifest = collect($this->files->allFiles($temporary))->first(fn ($file) => $file->getFilename() === 'theme.json');
        if (! $manifest) { $this->files->deleteDirectory($temporary); throw new RuntimeException('The package does not contain theme.json.'); }
        $source = $manifest->getPath();
        $theme = $this->loader->fromPath($source);
        if ($theme->parent() && ! $this->loader->all()->has($theme->parent())) throw new RuntimeException('Parent theme '.$theme->parent().' is not installed.');
        $issues = $this->validator->validate($theme);
        if (collect($issues)->contains('severity', 'error')) throw new RuntimeException('Accessibility validation failed: '.collect($issues)->where('severity', 'error')->pluck('message')->implode(' '));
        $target = rtrim((string) config('stylist.themes_path'), '/').'/'.$theme->key();
        if ($this->files->isDirectory($target)) $this->files->deleteDirectory($target);
        $this->files->copyDirectory($source, $target);
        $this->files->deleteDirectory($temporary);
        $this->loader->flush();
        return $this->loader->find($theme->key());
    }

    public function uninstall(Theme $theme): void
    {
        $projectRoot = realpath((string) config('stylist.themes_path'));
        $themePath = realpath($theme->path());
        if (! $projectRoot || ! $themePath || ! str_starts_with($themePath, $projectRoot.DIRECTORY_SEPARATOR)) throw new RuntimeException('Bundled themes cannot be uninstalled.');
        if (collect($this->loader->all())->contains(fn (Theme $candidate) => $candidate->parent() === $theme->key())) throw new RuntimeException('This theme has installed child themes.');
        $this->files->deleteDirectory($themePath); $this->loader->flush();
    }

    public function export(Theme $theme): string
    {
        $directory = storage_path('app/stylist/exports'); $this->files->ensureDirectoryExists($directory);
        $path = $directory.'/'.$theme->key().'-'.$theme->version().'.zip';
        $zip = new ZipArchive(); if ($zip->open($path, ZipArchive::CREATE|ZipArchive::OVERWRITE) !== true) throw new RuntimeException('Unable to create theme archive.');
        foreach ($this->files->allFiles($theme->path()) as $file) $zip->addFile($file->getPathname(), $theme->key().'/'.$file->getRelativePathname());
        $zip->close(); return $path;
    }
}