<?php

namespace App\Console\Commands;

use App\Jobs\BatchImportFromGutendex;
use App\Jobs\ImportBookFromGutendex;
use Illuminate\Console\Command;

class ImportFromGutendex extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'gutendex:import
                            {--language=en : Language code to filter books}
                            {--limit=100 : Maximum number of books to import}
                            {--page=1 : Starting page number}
                            {--queue : Run the import via queue jobs}
                            {--no-summary : Skip summary generation}
                            {--copyright=false : Copyright filter (false for public domain)}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Import books from Gutendex API with optional filters';

    /**
     * Execute the console command.
     */
    public function handle(): int
    {
        $language = $this->option('language');
        $limit = (int) $this->option('limit');
        $page = (int) $this->option('page');
        $useQueue = $this->option('queue');
        $generateSummary = !$this->option('no-summary');
        $copyright = $this->option('copyright');

        $this->info('Gutendex Import');
        $this->info('==============');
        $this->newLine();

        // Build filters
        $filters = [
            'languages' => $language,
            'copyright' => $copyright,
        ];

        $this->table(
            ['Setting', 'Value'],
            [
                ['Language', $language],
                ['Limit', $limit],
                ['Starting Page', $page],
                ['Mode', $useQueue ? 'Queued' : 'Immediate'],
                ['Generate Summaries', $generateSummary ? 'Yes' : 'No'],
                ['Copyright Filter', $copyright],
            ]
        );

        if (!$this->confirm('Do you want to proceed with this import?', true)) {
            $this->warn('Import cancelled.');
            return self::SUCCESS;
        }

        $this->newLine();

        if ($useQueue) {
            return $this->handleQueuedImport($filters, $page, $limit, $generateSummary);
        } else {
            return $this->handleImmediateImport($filters, $page, $limit, $generateSummary);
        }
    }

    /**
     * Handle queued import.
     */
    protected function handleQueuedImport(array $filters, int $page, int $limit, bool $generateSummary): int
    {
        $this->info('Dispatching batch import job...');

        // Calculate end page based on limit (assuming ~32 books per page)
        $booksPerPage = 32;
        $endPage = $page + (int) ceil($limit / $booksPerPage) - 1;

        BatchImportFromGutendex::dispatch(
            $filters,
            $page,
            $endPage,
            $limit,
            $generateSummary
        );

        $this->info('✓ Batch import job dispatched successfully!');
        $this->newLine();
        $this->comment('The import will be processed in the background.');
        $this->comment('Run the queue worker: php artisan queue:work');
        $this->comment('Monitor progress: php artisan summary:status');

        return self::SUCCESS;
    }

    /**
     * Handle immediate import (synchronous).
     */
    protected function handleImmediateImport(array $filters, int $page, int $limit, bool $generateSummary): int
    {
        $this->warn('⚠ Running immediate import. This may take a while...');
        $this->warn('⚠ For large imports, consider using --queue option.');
        $this->newLine();

        $gutendexClient = app(\App\Services\GutendexClient::class);

        $totalImported = 0;
        $totalSkipped = 0;
        $currentPage = $page;

        $progressBar = $this->output->createProgressBar($limit);
        $progressBar->start();

        while ($totalImported < $limit) {
            $response = $gutendexClient->searchBooks(null, $currentPage, $filters);

            if (empty($response['results'])) {
                $this->newLine();
                $this->warn('No more results available.');
                break;
            }

            foreach ($response['results'] as $bookData) {
                if ($totalImported >= $limit) {
                    break 2;
                }

                $gutenbergId = $bookData['id'] ?? null;
                if (!$gutenbergId) {
                    continue;
                }

                // Check if already exists
                if (\App\Models\Book::where('gutenberg_id', $gutenbergId)->exists()) {
                    $totalSkipped++;
                    $progressBar->advance();
                    continue;
                }

                // Dispatch job
                ImportBookFromGutendex::dispatch($gutenbergId, $generateSummary);
                $totalImported++;
                $progressBar->advance();
            }

            if (empty($response['next'])) {
                break;
            }

            $currentPage++;
        }

        $progressBar->finish();
        $this->newLine(2);

        $this->info('✓ Import jobs dispatched successfully!');
        $this->newLine();
        $this->table(
            ['Metric', 'Count'],
            [
                ['Jobs Dispatched', $totalImported],
                ['Books Skipped (existing)', $totalSkipped],
                ['Pages Processed', $currentPage - $page + 1],
            ]
        );

        $this->newLine();
        $this->comment('Jobs have been dispatched to the queue.');
        $this->comment('Run the queue worker: php artisan queue:work');

        return self::SUCCESS;
    }
}