<?php

namespace Modules\Webstatement\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Facades\Log;
use Modules\Webstatement\Jobs\CombinePdfJob;
use Modules\Webstatement\Models\Account;
use Carbon\Carbon;

class CombinePdfController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        return view('webstatement::index');
    }

    /**
     * Combine PDF files from r14 and r23 folders for all accounts
     *
     * @param Request $request
     * @return \Illuminate\Http\JsonResponse
     */
    public function combinePdfs($period)
    {
        // Configuration: Set r23 file source - 'local' or 'sftp'
        $file_r23 = 'local'; // Change this to 'sftp' to use SFTP for r23 files

        // Configuration: Set output destination - 'local' or 'sftp'
        $output_destination = 'local'; // Change this to 'sftp' to upload combined PDFs to SFTP

        // Get period from request or use current period
       $period = $period ?? date('Ym');

        // Get all accounts with customer relation
        $accounts = Account::where('branch_code','ID0010052')->get();
        $processedCount = 0;
        $skippedCount = 0;
        $errorCount = 0;

        foreach ($accounts as $account) {
            $branchCode = $account->branch_code;
            $accountNumber = $account->account_number;

            // Define file paths
            $r14Path = storage_path("app/r14/{$accountNumber}_{$period}.pdf");

            // Define temporary path for r23 files downloaded from SFTP
            $tempDir = storage_path("app/temp/{$period}");
            if (!File::exists($tempDir)) {
                File::makeDirectory($tempDir, 0755, true);
            }

            $outputDir = storage_path("app/combine/{$period}/{$branchCode}");
            $outputFilename = "{$accountNumber}_{$period}.pdf";

            // Check if r14 file exists locally
            $r14Exists = File::exists($r14Path);

            // Check for multiple r23 files based on configuration
            $r23Files = [];
            $r23Exists = false;

            if ($file_r23 === 'local') {
                // Use local r23 files - check for multiple files
                $r23Pattern = storage_path("app/r23/{$accountNumber}.*.pdf");
                $foundR23Files = glob($r23Pattern);

                if (!empty($foundR23Files)) {
                    // Sort files numerically by their sequence number
                    usort($foundR23Files, function($a, $b) {
                        preg_match('/\.(\d+)\.pdf$/', $a, $matchesA);
                        preg_match('/\.(\d+)\.pdf$/', $b, $matchesB);
                        return (int)$matchesA[1] - (int)$matchesB[1];
                    });

                    $r23Files = $foundR23Files;
                    $r23Exists = true;
                    Log::info("Found " . count($r23Files) . " r23 files locally for account {$accountNumber}");
                }
            } elseif ($file_r23 === 'sftp') {
                // Use SFTP r23 files - check for multiple files
                try {
                    $sftpFiles = Storage::disk('sftpStatement')->files('r23');
                    $accountR23Files = array_filter($sftpFiles, function($file) use ($accountNumber) {
                        return preg_match("/r23\/{$accountNumber}\.(\d+)\.pdf$/", $file);
                    });

                    if (!empty($accountR23Files)) {
                        // Sort files numerically by their sequence number
                        usort($accountR23Files, function($a, $b) {
                            preg_match('/\.(\d+)\.pdf$/', $a, $matchesA);
                            preg_match('/\.(\d+)\.pdf$/', $b, $matchesB);
                            return (int)$matchesA[1] - (int)$matchesB[1];
                        });

                        // Download all r23 files
                        foreach ($accountR23Files as $index => $sftpFile) {
                            $r23Content = Storage::disk('sftpStatement')->get($sftpFile);
                            $tempFileName = "{$tempDir}/{$accountNumber}_r23_" . ($index + 1) . ".pdf";
                            File::put($tempFileName, $r23Content);
                            $r23Files[] = $tempFileName;
                        }

                        $r23Exists = true;
                        Log::info("Downloaded " . count($r23Files) . " r23 files for account {$accountNumber} from SFTP");
                    }
                } catch (\Exception $e) {
                    Log::error("Error downloading r23 files from SFTP for account {$accountNumber}: {$e->getMessage()}");
                }
            }

            // Skip if neither file exists
            if (!$r14Exists && !$r23Exists) {
                //Log::warning("No PDF files found for account {$accountNumber}");
                $skippedCount++;
                continue;
            }

            // Prepare file list for processing
            $pdfFiles = [];
            if ($r14Exists) {
                $pdfFiles[] = $r14Path;
            }
            if ($r23Exists) {
                // Add all r23 files to the list
                $pdfFiles = array_merge($pdfFiles, $r23Files);
            }

            try {
                // Generate password based on customer relation data
                $password = $this->generatePassword($account);

                // Dispatch job to combine PDFs or apply password protection
                CombinePdfJob::dispatch($pdfFiles, $outputDir, $outputFilename, $password, $output_destination, $branchCode, $period);
                $processedCount++;

                Log::info("Queued PDF processing for account {$accountNumber} - r14: local, r23: {$file_r23}, output: {$output_destination}, password: {$password}");
            } catch (\Exception $e) {
                Log::error("Error processing PDF for account {$accountNumber}: {$e->getMessage()}");
                $errorCount++;
            }
        }

        Log::info("Processed {$processedCount} accounts, skipped {$skippedCount} accounts, and encountered {$errorCount} errors.");

        return response()->json([
            'message' => "PDF combination process has been queued (r14: local, r23: {$file_r23}, output: {$output_destination})",
            'processed' => $processedCount,
            'skipped' => $skippedCount,
            'errors' => $errorCount,
            'period' => $period
        ]);
    }

    /**
     * Generate password based on customer relation data
     * Format: date+end 2 digit account_number
     * Example: 05Oct202585
     *
     * @param Account $account
     * @return string
     */
    private function generatePassword(Account $account)
    {
        $customer = $account->customer;
        $accountNumber = $account->account_number;

        // Get last 2 digits of account number
        $lastTwoDigits = substr($accountNumber, -2);

        // Determine which date to use based on sector
        $dateToUse = null;

        if ($customer && $customer->sector) {
            $firstDigitSector = substr($customer->sector, 0, 1);

            if ($firstDigitSector === '1') {
                // Use date_of_birth if available, otherwise birth_incorp_date
                $dateToUse = $customer->date_of_birth ?: $customer->birth_incorp_date;
            } else {
                // Use birth_incorp_date for sector > 1
                $dateToUse = $customer->birth_incorp_date;
            }
        }

        // If no date found, fallback to account number
        if (!$dateToUse) {
            Log::warning("No date found for account {$accountNumber}, using account number as password");
            return $accountNumber;
        }

        try {
            // Parse the date and format it
            $date = Carbon::parse($dateToUse);
            $day = $date->format('d');
            $month = $date->format('M'); // 3-letter month abbreviation
            $year = $date->format('Y');

            // Format: ddMmmyyyyXX (e.g., 05Oct202585)
            $password = $day . $month . $year . $lastTwoDigits;

            return $password;
        } catch (\Exception $e) {
            Log::error("Error parsing date for account {$accountNumber}: {$e->getMessage()}");
            return $accountNumber; // Fallback to account number
        }
    }
}