<?php

namespace Modules\Webstatement\Jobs;

use Carbon\Carbon;
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\PrintStatementLog;
use Modules\Webstatement\Models\AccountBalance;
use Modules\Webstatement\Models\StmtEntry;
use Modules\Basicdata\Models\Branch;
use Spatie\Browsershot\Browsershot;
use ZipArchive;

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

    protected $statement;
    protected $accounts;
    protected $period;
    protected $clientName;
    protected $chunkSize = 10; // Process 10 accounts at a time

    /**
     * Create a new job instance.
     *
     * @param PrintStatementLog $statement
     * @param \Illuminate\Database\Eloquent\Collection $accounts
     * @param string $period
     * @param string $clientName
     */
    public function __construct($statement, $accounts, $period, $clientName)
    {
        $this->statement = $statement;
        $this->accounts = $accounts;
        $this->period = $period;
        $this->clientName = $clientName;
    }

    /**
     * Execute the job.
     */
    public function handle(): void
    {
        try {
            DB::beginTransaction();
            
            Log::info('Starting multi account PDF generation', [
                'statement_id' => $this->statement->id,
                'total_accounts' => $this->accounts->count(),
                'period' => $this->period
            ]);

            $pdfFiles = [];
            $successCount = 0;
            $failedCount = 0;
            $errors = [];

            // Process each account
            foreach ($this->accounts as $account) {
                try {
                    $pdfPath = $this->generateAccountPdf($account);
                    if ($pdfPath) {
                        $pdfFiles[] = $pdfPath;
                        $successCount++;
                        
                        Log::info('PDF generated successfully for account', [
                            'account_number' => $account->account_number,
                            'pdf_path' => $pdfPath
                        ]);
                    }
                } catch (Exception $e) {
                    $failedCount++;
                    $errors[] = [
                        'account_number' => $account->account_number,
                        'error' => $e->getMessage()
                    ];
                    
                    Log::error('Failed to generate PDF for account', [
                        'account_number' => $account->account_number,
                        'error' => $e->getMessage()
                    ]);
                }
            }

            // Create ZIP file if there are PDFs
            $zipPath = null;
            if (!empty($pdfFiles)) {
                $zipPath = $this->createZipFile($pdfFiles);
            }

            // Update statement log
            $this->statement->update([
                'processed_accounts' => $this->accounts->count(),
                'success_count' => $successCount,
                'failed_count' => $failedCount,
                'status' => $failedCount > 0 ? 'completed_with_errors' : 'completed',
                'completed_at' => now(),
                'is_available' => $zipPath ? true : false,
                'error_message' => !empty($errors) ? json_encode($errors) : null
            ]);

            DB::commit();

            Log::info('Multi account PDF generation completed', [
                'statement_id' => $this->statement->id,
                'success_count' => $successCount,
                'failed_count' => $failedCount,
                'zip_path' => $zipPath
            ]);

        } catch (Exception $e) {
            DB::rollBack();
            
            Log::error('Multi account PDF generation failed', [
                'statement_id' => $this->statement->id,
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            // Update statement with error status
            $this->statement->update([
                'status' => 'failed',
                'completed_at' => now(),
                'error_message' => $e->getMessage()
            ]);

            throw $e;
        }
    }

    /**
     * Generate PDF untuk satu account
     *
     * @param Account $account
     * @return string|null Path to generated PDF
     */
    protected function generateAccountPdf($account)
    {
        try {
            // Get statement entries
            $stmtEntries = $this->getStatementEntries($account->account_number);
            
            // Get saldo awal bulan
            $saldoAwalBulan = $this->getSaldoAwalBulan($account->account_number);
            
            // Get branch info
            $branch = Branch::where('code', $account->branch_code)->first();
            
            // Prepare images for PDF
            $images = $this->prepareImagesForPdf();
            
            // Render HTML
            $html = view('webstatement::statements.stmt', compact(
                'stmtEntries',
                'account',
                'customer' => $account->customer,
                'images',
                'branch',
                'period' => $this->period,
                'saldoAwalBulan'
            ))->render();
            
            // Generate PDF filename
            $filename = "statement_{$account->account_number}_{$this->period}_" . now()->format('YmdHis') . '.pdf';
            $storagePath = "statements/{$this->period}/multi_account/{$this->statement->id}";
            $fullStoragePath = "{$storagePath}/{$filename}";
            
            // Ensure directory exists
            Storage::disk('local')->makeDirectory($storagePath);
            
            // Generate PDF path
            $pdfPath = storage_path("app/{$fullStoragePath}");
            
            // Generate PDF using Browsershot
            Browsershot::html($html)
                ->setOption('addStyleTag', json_encode(['content' => '@page { margin: 0; }']))
                ->format('A4')
                ->margins(0, 0, 0, 0)
                ->waitUntilNetworkIdle()
                ->timeout(60)
                ->save($pdfPath);
                
            // Verify file was created
            if (!file_exists($pdfPath)) {
                throw new Exception('PDF file was not created');
            }
            
            return $pdfPath;
            
        } catch (Exception $e) {
            Log::error('Failed to generate PDF for account', [
                'account_number' => $account->account_number,
                'error' => $e->getMessage()
            ]);
            
            throw $e;
        }
    }

    /**
     * Get statement entries untuk account
     *
     * @param string $accountNumber
     * @return \Illuminate\Database\Eloquent\Collection
     */
    protected function getStatementEntries($accountNumber)
    {
        // Calculate period dates
        $year = substr($this->period, 0, 4);
        $month = substr($this->period, 4, 2);
        
        if ($this->period === '202505') {
            $startDate = Carbon::createFromDate($year, $month, 12)->startOfDay();
        } else {
            $startDate = Carbon::createFromDate($year, $month, 1)->startOfDay();
        }
        
        $endDate = Carbon::createFromDate($year, $month, 1)->endOfMonth()->endOfDay();
        
        return StmtEntry::where('account_number', $accountNumber)
            ->whereBetween('booking_date', [
                $startDate->format('Ymd'),
                $endDate->format('Ymd')
            ])
            ->orderBy('date_time', 'ASC')
            ->orderBy('trans_reference', 'ASC')
            ->get();
    }

    /**
     * Get saldo awal bulan untuk account
     *
     * @param string $accountNumber
     * @return object
     */
    protected function getSaldoAwalBulan($accountNumber)
    {
        $saldoPeriod = $this->calculateSaldoPeriod($this->period);
        
        $saldo = AccountBalance::where('account_number', $accountNumber)
            ->where('period', $saldoPeriod)
            ->first();
            
        return $saldo ?: (object) ['actual_balance' => 0];
    }

    /**
     * Calculate saldo period berdasarkan aturan bisnis
     *
     * @param string $period
     * @return string
     */
    protected function calculateSaldoPeriod($period)
    {
        if ($period === '202505') {
            return '20250510';
        }
        
        // For periods after 202505, get last day of previous month
        if ($period > '202505') {
            $year = substr($period, 0, 4);
            $month = substr($period, 4, 2);
            $firstDay = Carbon::createFromFormat('Ym', $period)->startOfMonth();
            return $firstDay->copy()->subDay()->format('Ymd');
        }
        
        return $period . '01';
    }

    /**
     * Prepare images as base64 for PDF
     *
     * @return array
     */
    protected function prepareImagesForPdf()
    {
        $images = [];
        
        $imagePaths = [
            'headerTableBg' => 'assets/media/images/bg-header-table.png',
            'watermark' => 'assets/media/images/watermark.png',
            'logoArthagraha' => 'assets/media/images/logo-arthagraha.png',
            'logoAgi' => 'assets/media/images/logo-agi.png',
            'bannerFooter' => 'assets/media/images/banner-footer.png'
        ];
        
        foreach ($imagePaths as $key => $path) {
            $fullPath = public_path($path);
            if (file_exists($fullPath)) {
                $images[$key] = base64_encode(file_get_contents($fullPath));
            } else {
                $images[$key] = null;
            }
        }
        
        return $images;
    }

    /**
     * Create ZIP file dari multiple PDF files
     *
     * @param array $pdfFiles
     * @return string|null Path to ZIP file
     */
    protected function createZipFile($pdfFiles)
    {
        try {
            $zipFilename = "statements_{$this->period}_multi_account_{$this->statement->id}_" . now()->format('YmdHis') . '.zip';
            $zipStoragePath = "statements/{$this->period}/multi_account/{$this->statement->id}";
            $fullZipPath = "{$zipStoragePath}/{$zipFilename}";
            
            // Ensure directory exists
            Storage::disk('local')->makeDirectory($zipStoragePath);
            
            $zipPath = storage_path("app/{$fullZipPath}");
            
            $zip = new ZipArchive();
            if ($zip->open($zipPath, ZipArchive::CREATE) !== TRUE) {
                throw new Exception('Cannot create ZIP file');
            }
            
            foreach ($pdfFiles as $pdfFile) {
                if (file_exists($pdfFile)) {
                    $filename = basename($pdfFile);
                    $zip->addFile($pdfFile, $filename);
                }
            }
            
            $zip->close();
            
            // Verify ZIP file was created
            if (!file_exists($zipPath)) {
                throw new Exception('ZIP file was not created');
            }
            
            Log::info('ZIP file created successfully', [
                'zip_path' => $zipPath,
                'pdf_count' => count($pdfFiles),
                'statement_id' => $this->statement->id
            ]);
            
            return $zipPath;
            
        } catch (Exception $e) {
            Log::error('Failed to create ZIP file', [
                'error' => $e->getMessage(),
                'statement_id' => $this->statement->id
            ]);
            
            return null;
        }
    }
}