<?php

namespace Modules\Marketplace\Services;

use Illuminate\Support\Facades\DB;
use Modules\Marketplace\Models\Installation;
use Modules\Marketplace\Models\InstalledPackage;
use Modules\Marketplace\Models\MarketplacePackage;
use RuntimeException;

final class MarketplaceManager
{
    public function __construct(private PackageManifest $manifests, private CompatibilityChecker $compatibility, private DependencyResolver $dependencies) {}

    public function install(MarketplacePackage $package, ?int $userId = null): InstalledPackage
    {
        if (! config('marketplace.enabled')) {
            throw new RuntimeException('The marketplace is disabled.');
        }
        $manifest = $this->manifests->parse($package->manifest ?: ['name' => $package->package_name, 'type' => $package->type, 'version' => $package->latest_version]);
        $compatibility = $this->compatibility->check($manifest);
        if (! $compatibility['compatible']) {
            throw new RuntimeException(implode(' ', $compatibility['errors']));
        }
        $dependencies = $this->dependencies->resolve($manifest);
        if (! $dependencies['satisfied']) {
            throw new RuntimeException('Package dependencies are not satisfied.');
        }

        return DB::transaction(function () use ($package, $manifest, $userId) {
            $installed = InstalledPackage::query()->firstOrNew(['package_name' => $package->package_name]);
            $from = $installed->exists ? $installed->version : null;
            $installed->fill(['marketplace_package_id' => $package->id, 'type' => $package->type, 'version' => $manifest['version'], 'status' => 'installed', 'manifest' => $manifest, 'checksum' => $package->checksum, 'is_enabled' => true, 'installed_by' => $userId, 'installed_at' => $installed->installed_at ?: now(), 'updated_at_marketplace' => now()])->save();
            $this->history($installed, $from ? 'update' : 'install', $from, $manifest['version'], $userId, 'completed');

            return $installed->refresh();
        });
    }

    public function setEnabled(InstalledPackage $package, bool $enabled, ?int $userId = null): InstalledPackage
    {
        $package->update(['is_enabled' => $enabled, 'status' => $enabled ? 'installed' : 'disabled']);
        $this->history($package, $enabled ? 'enable' : 'disable', $package->version, $package->version, $userId, 'completed');

        return $package->refresh();
    }

    public function remove(InstalledPackage $package, ?int $userId = null): void
    {
        DB::transaction(function () use ($package, $userId) {
            $this->history($package, 'remove', $package->version, null, $userId, 'completed');
            $package->update(['status' => 'removed', 'is_enabled' => false]);
        });
    }

    public function rollback(InstalledPackage $package, Installation $installation, ?int $userId = null): InstalledPackage
    {
        if ($installation->package_name !== $package->package_name || blank($installation->from_version)) {
            throw new RuntimeException('This installation cannot be rolled back.');
        }
        $current = $package->version;
        $package->update(['version' => $installation->from_version, 'status' => 'installed', 'is_enabled' => true]);
        $this->history($package, 'rollback', $current, $installation->from_version, $userId, 'completed');

        return $package->refresh();
    }

    private function history(InstalledPackage $package, string $operation, ?string $from, ?string $to, ?int $userId, string $status): Installation
    {
        return Installation::query()->create(['installed_package_id' => $package->id, 'package_name' => $package->package_name, 'operation' => $operation, 'from_version' => $from, 'to_version' => $to, 'status' => $status, 'performed_by' => $userId, 'started_at' => now(), 'completed_at' => now()]);
    }
}