<?php

namespace App\Console\Commands;

use App\Models\AuditLog;
use App\Models\Document;
use App\Models\DocumentCategory;
use App\Models\User;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Storage;

class ImportDocuments extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'documents:import
                            {path : Path to directory containing documents and manifest.json}
                            {--user-id=1 : User ID to attribute uploads to}
                            {--dry-run : Preview import without making changes}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Bulk import documents from a directory with manifest.json';

    /**
     * Execute the console command.
     */
    public function handle()
    {
        $path = $this->argument('path');
        $userId = $this->option('user-id');
        $dryRun = $this->option('dry-run');

        // Validate path
        if (!File::isDirectory($path)) {
            $this->error("Directory not found: {$path}");
            return 1;
        }

        // Check for manifest.json
        $manifestPath = $path . '/manifest.json';
        if (!File::exists($manifestPath)) {
            $this->error("manifest.json not found in {$path}");
            $this->info("Expected format:");
            $this->line($this->getManifestExample());
            return 1;
        }

        // Load manifest
        $manifest = json_decode(File::get($manifestPath), true);
        if (!$manifest || !isset($manifest['documents'])) {
            $this->error("Invalid manifest.json format");
            return 1;
        }

        // Validate user
        $user = User::find($userId);
        if (!$user) {
            $this->error("User not found: {$userId}");
            return 1;
        }

        $this->info("Importing documents from: {$path}");
        $this->info("Attributed to: {$user->name}");
        if ($dryRun) {
            $this->warn("DRY RUN - No changes will be made");
        }
        $this->newLine();

        $successCount = 0;
        $errorCount = 0;

        foreach ($manifest['documents'] as $item) {
            try {
                $this->processDocument($path, $item, $user, $dryRun);
                $successCount++;
            } catch (\Exception $e) {
                $this->error("Error processing {$item['file']}: {$e->getMessage()}");
                $errorCount++;
            }
        }

        $this->newLine();
        $this->info("Import complete!");
        $this->info("Success: {$successCount}");
        if ($errorCount > 0) {
            $this->error("Errors: {$errorCount}");
        }

        return 0;
    }

    protected function processDocument(string $basePath, array $item, User $user, bool $dryRun): void
    {
        $filePath = $basePath . '/' . $item['file'];

        // Validate file exists
        if (!File::exists($filePath)) {
            throw new \Exception("File not found: {$filePath}");
        }

        // Find or create category
        $category = DocumentCategory::where('slug', $item['category'])->first();
        if (!$category) {
            throw new \Exception("Category not found: {$item['category']}");
        }

        $this->line("Processing: {$item['title']}");
        $this->line("  Category: {$category->name}");
        $this->line("  File: {$item['file']}");

        if ($dryRun) {
            $this->line("  [DRY RUN] Would create document");
            return;
        }

        // Copy file to storage
        $fileInfo = pathinfo($filePath);
        $storagePath = 'documents/' . uniqid() . '.' . $fileInfo['extension'];
        Storage::disk('private')->put($storagePath, File::get($filePath));

        // Create document
        $document = Document::create([
            'document_category_id' => $category->id,
            'title' => $item['title'],
            'document_number' => $item['document_number'] ?? null,
            'description' => $item['description'] ?? null,
            'access_level' => $item['access_level'] ?? $category->default_access_level,
            'status' => 'active',
            'created_by' => $user->id,
            'updated_by' => $user->id,
        ]);

        // Add first version
        $document->addVersion(
            filePath: $storagePath,
            originalFilename: $fileInfo['basename'],
            mimeType: File::mimeType($filePath),
            fileSize: File::size($filePath),
            uploadedBy: $user,
            versionNotes: $item['version_notes'] ?? 'Initial import'
        );

        AuditLog::create([
            'user_id' => $user->id,
            'action' => 'document.imported',
            'auditable_type' => Document::class,
            'auditable_id' => $document->id,
            'old_values' => null,
            'new_values' => ['title' => $item['title']],
            'ip_address' => '127.0.0.1',
            'user_agent' => 'CLI Import',
        ]);

        $this->info("  ✓ Created document ID: {$document->id}");
    }

    protected function getManifestExample(): string
    {
        return <<<'JSON'
{
  "documents": [
    {
      "file": "bylaws.pdf",
      "title": "協會章程",
      "category": "association-bylaws",
      "document_number": "2024-001",
      "description": "協會章程修正版",
      "access_level": "members",
      "version_notes": "Initial import"
    },
    {
      "file": "meeting-2024-01.pdf",
      "title": "2024年1月會議記錄",
      "category": "meeting-minutes",
      "access_level": "members"
    }
  ]
}
JSON;
    }
}