<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Candidate;
use Barryvdh\DomPDF\Facade\Pdf;
use Illuminate\Http\Request;

class CandidateExportController extends Controller
{
    public function exportDossier(Candidate $candidate)
    {
        $candidate->load([
            'user', 
            'jobPosition', 
            'tenant', 
            'attempts.quiz.questions', 
            'attempts.answers.option', 
            'attempts.answers.question',
            'documents'
        ]);

        $filename = 'Dossier_' . str_replace(' ', '_', $candidate->user->name) . '_' . date('Ymd') . '.pdf';

        // 1. Generate Main Report with DomPDF
        $pdfReport = Pdf::loadView('pdfs.candidate-dossier', [
            'candidate' => $candidate
        ]);
        $reportBinary = $pdfReport->output();

        // 2. Setup FPDI for merging
        $mergedPdf = new \setasign\Fpdi\Fpdi();
        
        // Add Main Report Pages
        $reportTmp = tempnam(sys_get_temp_dir(), 'pdf_report_');
        file_put_contents($reportTmp, $reportBinary);
        
        try {
            $pageCount = $mergedPdf->setSourceFile($reportTmp);
            for ($pageNo = 1; $pageNo <= $pageCount; $pageNo++) {
                $templateId = $mergedPdf->importPage($pageNo);
                $size = $mergedPdf->getTemplateSize($templateId);
                $mergedPdf->AddPage($size['orientation'], [$size['width'], $size['height']]);
                $mergedPdf->useTemplate($templateId);
            }
        } catch (\Exception $e) {
            \Log::error('FPDI Error on report: ' . $e->getMessage());
        }
        @unlink($reportTmp);

        // 3. Append Candidate Documents (CV, Letter)
        foreach ($candidate->documents as $doc) {
            if (\Storage::disk('local')->exists($doc->file_path)) {
                $filePath = \Storage::disk('local')->path($doc->file_path);
                
                try {
                    $pageCount = $mergedPdf->setSourceFile($filePath);
                    for ($pageNo = 1; $pageNo <= $pageCount; $pageNo++) {
                        $templateId = $mergedPdf->importPage($pageNo);
                        $size = $mergedPdf->getTemplateSize($templateId);
                        $mergedPdf->AddPage($size['orientation'], [$size['width'], $size['height']]);
                        $mergedPdf->useTemplate($templateId);
                    }
                } catch (\Exception $e) {
                    \Log::warning('Could not merge document ID ' . $doc->id . ': ' . $e->getMessage());
                    
                    // Add a professional placeholder page for unmergable documents
                    $mergedPdf->AddPage('P', 'A4');
                    $mergedPdf->SetFont('Arial', 'B', 16);
                    $mergedPdf->SetTextColor(0, 79, 130); // Primary color
                    $mergedPdf->Ln(50);
                    $mergedPdf->Cell(0, 20, utf8_decode("DOCUMENT JOINT : " . strtoupper($doc->type)), 0, 1, 'C');
                    $mergedPdf->SetFont('Arial', 'I', 12);
                    $mergedPdf->Cell(0, 10, utf8_decode($doc->original_name), 0, 1, 'C');
                    
                    $mergedPdf->Ln(30);
                    $mergedPdf->SetFont('Arial', '', 11);
                    $mergedPdf->SetTextColor(100, 100, 100);
                    $mergedPdf->MultiCell(0, 8, utf8_decode("Ce document n'a pas pu être fusionné automatiquement au dossier car son format est trop récent (PDF 1.5+).\n\nPour garantir l'intégrité de la mise en page, veuillez consulter ce document séparément via l'interface du tableau de bord candidat."), 0, 'C');
                    
                    $mergedPdf->Ln(20);
                    $mergedPdf->SetDrawColor(224, 176, 76); // Highlight color
                    $mergedPdf->Line(60, $mergedPdf->GetY(), 150, $mergedPdf->GetY());
                }
            }
        }

        return response($mergedPdf->Output('S'), 200, [
            'Content-Type' => 'application/pdf',
            'Content-Disposition' => 'attachment; filename="' . $filename . '"',
            'Cache-Control' => 'no-cache, no-store, must-revalidate',
            'Pragma' => 'no-cache',
            'Expires' => '0',
        ]);
    }

    public function exportZip(Candidate $candidate)
    {
        $candidate->load(['user', 'jobPosition', 'tenant', 'attempts.quiz.questions', 'attempts.answers.option', 'attempts.answers.question', 'documents']);

        $baseName = 'Dossier_' . str_replace(' ', '_', $candidate->user->name) . '_' . date('Ymd');
        $zipPath = tempnam(sys_get_temp_dir(), 'candidate_zip_');
        $zip = new \ZipArchive();

        if ($zip->open($zipPath, \ZipArchive::CREATE | \ZipArchive::OVERWRITE) !== true) {
            return back()->with('error', 'Impossible de créer le fichier ZIP.');
        }

        // 1. Add the main report (Rapport CABM)
        $pdfReport = Pdf::loadView('pdfs.candidate-dossier', [
            'candidate' => $candidate
        ]);
        $zip->addFromString($baseName . '/Rapport_Synthese_CABM.pdf', $pdfReport->output());

        // 2. Add original documents
        foreach ($candidate->documents as $doc) {
            if (\Storage::disk('local')->exists($doc->file_path)) {
                $content = \Storage::disk('local')->get($doc->file_path);
                // Sanitize original name or use type
                $ext = pathinfo($doc->original_name, PATHINFO_EXTENSION);
                $fileName = strtoupper($doc->type) . '_' . $doc->original_name;
                $zip->addFromString($baseName . '/Documents_Originaux/' . $fileName, $content);
            }
        }

        $zip->close();

        return response()->download($zipPath, $baseName . '.zip')->deleteFileAfterSend(true);
    }
}