<?php

namespace Modules\Webstatement\Jobs;

use Exception;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;
use Modules\Webstatement\Models\AtmTransaction;
use Modules\Webstatement\Models\AtmTransactionReportLog;

class GenerateAtmTransactionReportJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    private string $period;
    private const CHUNK_SIZE = 1000;
    private const CSV_DELIMITER = ',';
    private ?int $reportLogId;

    public function __construct(string $period, ?int $reportLogId = null)
    {
        $this->period = $period;
        $this->reportLogId = $reportLogId;
    }

    public function handle(): void
    {
        $reportLog = null;
        if ($this->reportLogId) {
            $reportLog = AtmTransactionReportLog::find($this->reportLogId);
        }

        try {
            Log::info("Starting ATM Transaction report generation for period: {$this->period} and LogId: {$this->reportLogId}");

            $filename = "atm_transaction_report_{$this->period}.csv";
            $filePath = "reports/atm_transactions/{$filename}";

            // Create directory if not exists
            Storage::makeDirectory('reports/atm_transactions');

            // Initialize CSV file with headers
            $headers = [
                'reff_no',
                'pan',
                'atm_id_terminal_id',
                'amount',
                'channel',
                'account_no',
                'internal_account',
                'transaction_type',
                'trans_ref',
                'posting_date',
                'stan',
                'trans_status'
            ];

            $csvContent = implode(self::CSV_DELIMITER, $headers) . "\n";
            Storage::put($filePath, $csvContent);

            $totalRecords = 0;

            // Process data in chunks
            AtmTransaction::select(
                'retrieval_ref_no as reff_no',
                'pan_number as pan',
                'card_acc_id as atm_id_terminal_id',
                'txn_amount as amount',
                'merchant_id as channel',
                'debit_acct_no as account_no',
                'credit_acct_no as internal_account',
                'txn_type as transaction_type',
                'trans_ref',
                'booking_date as posting_date',
                'stan_no as stan',
                'trans_status'
            )
            ->where('booking_date', $this->period)
            ->chunk(self::CHUNK_SIZE, function ($transactions) use ($filePath, &$totalRecords) {
                $csvRows = [];

                foreach ($transactions as $transaction) {
                    $csvRows[] = implode(self::CSV_DELIMITER, [
                        $this->escapeCsvValue($transaction->reff_no),
                        $this->escapeCsvValue($transaction->pan),
                        $this->escapeCsvValue($transaction->atm_id_terminal_id),
                        $this->escapeCsvValue($transaction->amount),
                        $this->escapeCsvValue($transaction->channel),
                        $this->escapeCsvValue($transaction->account_no),
                        $this->escapeCsvValue($transaction->internal_account),
                        $this->escapeCsvValue($transaction->transaction_type),
                        $this->escapeCsvValue($transaction->trans_ref),
                        $this->escapeCsvValue($transaction->posting_date),
                        $this->escapeCsvValue($transaction->stan),
                        $this->escapeCsvValue($transaction->trans_status)
                    ]);
                    $totalRecords++;
                }

                if (!empty($csvRows)) {
                    Storage::append($filePath, implode("\n", $csvRows));
                }
            });

            // Update report log if exists
            if ($reportLog) {
                $reportLog->update([
                    'status' => 'completed',
                    'file_path' => $filePath,
                    'file_size' => Storage::size($filePath),
                    'record_count' => $totalRecords,
                ]);
            }

            Log::info("ATM Transaction report generated successfully. File: {$filePath}, Total records: {$totalRecords}");

        } catch (Exception $e) {
            if ($reportLog) {
                $reportLog->update([
                    'status' => 'failed',
                    'error_message' => $e->getMessage(),
                ]);
            }

            Log::error("Error generating ATM Transaction report for period {$this->period}: " . $e->getMessage());
            throw $e;
        }
    }

    /**
     * Escape CSV values to handle commas and quotes
     */
    private function escapeCsvValue($value): string
    {
        if ($value === null) {
            return '';
        }

        $value = (string) $value;

        // If value contains comma, quote, or newline, wrap in quotes and escape internal quotes
        if (strpos($value, self::CSV_DELIMITER) !== false ||
            strpos($value, '"') !== false ||
            strpos($value, "\n") !== false) {
            $value = '"' . str_replace('"', '""', $value) . '"';
        }

        return $value;
    }
}