<?php
// Start output buffering to prevent any accidental output before headers
ob_start();

require_once __DIR__ . '/db/config.php';
require_once __DIR__ . '/lib/ErrorHandler.php';
require_once __DIR__ . '/lib/tfpdf/tfpdf.php';
require_once __DIR__ . '/lib/tfpdf/font/unifont/ttfonts.php';

// Disable error display to avoid corrupting PDF output
ini_set('display_errors', 0);
error_reporting(E_ALL);

$group_name = $_GET['group_name'] ?? '';

if (empty($group_name)) {
    while (ob_get_level() > 0) ob_end_clean();
    http_response_code(400);
    header('Content-Type: application/json');
    echo json_encode(['success' => false, 'error' => 'Parameter group_name is required']);
    exit;
}

try {
    $db = db();
    
    // 1. Fetch group by name
    $stmt = $db->prepare('SELECT id, name FROM bni_groups WHERE LOWER(name) = LOWER(?)');
    $stmt->execute([trim($group_name)]);
    $group = $stmt->fetch(PDO::FETCH_ASSOC);
    
    if (!$group) {
        while (ob_get_level() > 0) ob_end_clean();
        http_response_code(404);
        header('Content-Type: application/json');
        echo json_encode(['success' => false, 'error' => 'Group not found']);
        exit;
    }
    
    $groupId = $group['id'];
    $groupRealName = $group['name'];
    
    // 2. Fetch members
    $stmt = $db->prepare('
        SELECT 
            p.first_name, 
            p.last_name, 
            p.person_photo_path,
            p.company_name, 
            p.company_logo_path, 
            p.business_description,
            p.industry, 
            p.company_size
        FROM people p
        WHERE p.bni_group_id = ?
        ORDER BY p.last_name ASC, p.first_name ASC
    ');
    $stmt->execute([$groupId]);
    $members = $stmt->fetchAll(PDO::FETCH_ASSOC);
    
    if (empty($members)) {
        while (ob_get_level() > 0) ob_end_clean();
        http_response_code(404);
        header('Content-Type: application/json');
        echo json_encode(['success' => false, 'error' => 'No members found in this group']);
        exit;
    }
    
    // Helper to validate images before adding to PDF
    $tempFiles = [];
    function getVerifiedImagePath($path, &$tempFiles) {
        if (empty($path)) return null;
        
        // Local file
        if (strpos($path, 'http') !== 0) {
            $localPath = rtrim(realpath(__DIR__), '/') . '/' . ltrim($path, '/');
            if (!file_exists($localPath)) return null;
            $info = @getimagesize($localPath);
            if ($info && in_array($info[2], [IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG])) {
                return $localPath;
            }
            return null;
        }
        
        // URL
        $ch = curl_init($path);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 3);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        $data = curl_exec($ch);
        $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        
        if ($code >= 200 && $code < 300 && $data) {
            $tmp = tempnam(sys_get_temp_dir(), 'pdfimg_');
            file_put_contents($tmp, $data);
            $info = @getimagesize($tmp);
            if ($info && in_array($info[2], [IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG])) {
                $tempFiles[] = $tmp;
                return $tmp;
            }
            @unlink($tmp);
        }
        return null;
    }

    // 3. Create PDF
    $pdf = new tFPDF();
    $pdf->AddFont('DejaVu', '', 'DejaVuSans.ttf', true);
    $pdf->AddFont('DejaVu', 'B', 'DejaVuSans-Bold.ttf', true);
    
    $pdf->SetMargins(15, 20, 15);
    $pdf->SetAutoPageBreak(true, 15);
    
    foreach ($members as $member) {
        $pdf->AddPage();
        
        // --- HEADER ---
        $pdf->SetFont('DejaVu', 'B', 12);
        $pdf->SetTextColor(150, 150, 150);
        $pdf->Cell(0, 10, 'Grupa: ' . $groupRealName, 0, 1, 'R');
        $pdf->Ln(5);
        $pdf->SetTextColor(0, 0, 0);
        
        // --- IMAGES ---
        $yStart = $pdf->GetY();
        $minY = $yStart;
        
        // Left - Photo
        if (!empty($member['person_photo_path'])) {
            $validPath = getVerifiedImagePath($member['person_photo_path'], $tempFiles);
            if ($validPath) {
                @$pdf->Image($validPath, 15, $yStart, 40);
                $minY = max($minY, $yStart + 50);
            }
        }
        
        // Right - Logo
        if (!empty($member['company_logo_path'])) {
            $validPath = getVerifiedImagePath($member['company_logo_path'], $tempFiles);
            if ($validPath) {
                @$pdf->Image($validPath, 155, $yStart, 40);
                $minY = max($minY, $yStart + 50);
            }
        }
        
        // --- MAIN INFO ---
        $pdf->SetY($yStart + 10);
        
        $name = trim($member['first_name'] . ' ' . $member['last_name']);
        if ($name === '') {
            $name = 'Nieznany członek';
        }
        
        $pdf->SetFont('DejaVu', 'B', 22);
        // Add margins for text so it doesn't overlap images
        $pdf->SetLeftMargin(55);
        $pdf->SetRightMargin(55);
        
        $pdf->Cell(100, 12, $name, 0, 1, 'C');
        
        $companyName = trim($member['company_name'] ?? '');
        if ($companyName !== '') {
            $pdf->SetFont('DejaVu', 'B', 16);
            $pdf->SetTextColor(80, 80, 80);
            $pdf->MultiCell(100, 8, $companyName, 0, 'C');
            $pdf->SetTextColor(0, 0, 0);
        }
        
        // Reset margins
        $pdf->SetLeftMargin(15);
        $pdf->SetRightMargin(15);
        $pdf->SetX(15);
        
        // Ensure we draw details below the images
        if ($pdf->GetY() < $minY) {
            $pdf->SetY($minY + 5);
        } else {
            $pdf->Ln(10);
        }
        
        // --- DETAILS ---
        $pdf->SetFont('DejaVu', 'B', 12);
        
        // Industry
        $pdf->Cell(45, 8, 'Branża:', 0, 0);
        $pdf->SetFont('DejaVu', '', 12);
        $industry = trim($member['industry'] ?? '');
        $pdf->Cell(0, 8, $industry !== '' ? $industry : '-', 0, 1);
        
        // Company Size
        $pdf->SetFont('DejaVu', 'B', 12);
        $pdf->Cell(45, 8, 'Wielkość firmy:', 0, 0);
        $pdf->SetFont('DejaVu', '', 12);
        $companySize = trim($member['company_size'] ?? '');
        $pdf->Cell(0, 8, $companySize !== '' ? $companySize : '-', 0, 1);
        
        $pdf->Ln(8);
        
        // Description
        $pdf->SetFont('DejaVu', 'B', 12);
        $pdf->Cell(0, 8, 'Opis:', 0, 1);
        
        $pdf->SetFont('DejaVu', '', 11);
        $desc = trim($member['business_description'] ?? '');
        if ($desc === '') {
            $desc = 'Brak opisu.';
        }
        
        $pdf->MultiCell(0, 6, $desc);
    }
    
    // Clear buffer before sending headers
    while (ob_get_level() > 0) ob_end_clean();
    
    $safeName = preg_replace('/[^a-zA-Z0-9_\-]/', '_', strtolower($groupRealName));
    $filename = 'lista_czlonkow_' . $safeName . '.pdf';
    
    header('Content-Type: application/pdf');
    header('Content-Disposition: attachment; filename="' . $filename . '"');
    header('Cache-Control: private, max-age=0, must-revalidate');
    header('Pragma: public');
    
    // Output directly
    $pdf->Output('D', $filename);
    
    // Cleanup
    foreach ($tempFiles as $tmp) {
        @unlink($tmp);
    }
    
    exit;

} catch (Exception $e) {
    while (ob_get_level() > 0) ob_end_clean();
    http_response_code(500);
    header('Content-Type: application/json');
    echo json_encode(['success' => false, 'error' => 'Wystąpił błąd podczas generowania PDF', 'details' => $e->getMessage()]);
    exit;
}