<?php  
// For debugging during development
ini_set('display_errors', 1);
error_reporting(E_ALL);

ob_start();
require_once('tcpdf/tcpdf.php');
require_once('db_connection.php');

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['report_class'], $_POST['report_term'], $_POST['report_year'], $_POST['student_id'])) {
    $class = $_POST['report_class'];
    $term = $_POST['report_term'];
    $year = $_POST['report_year'];
    $student_id = $_POST['student_id'];

    // Fetch student details even if only midterm exists
    $stmt = $pdo->prepare("
        SELECT s.STUDENT_ID, s.STUDENT_NAME, s.CLASS, s.SEX
        FROM STUDENTS s
        WHERE s.STUDENT_ID = ? AND s.STATUS = 'Sponsored'
    ");
    $stmt->execute([$student_id]);
    $student = $stmt->fetch(PDO::FETCH_ASSOC);

    if (!$student) {
        ob_end_clean();
        die('Student not found or not sponsored.');
    }

    // Get end of term results
    $stmtEOT = $pdo->prepare("
        SELECT * FROM RANKED_RESULTS 
        WHERE STUDENT_ID = ? AND TERM = ? AND YEAR = ?
    ");
    $stmtEOT->execute([$student_id, $term, $year]);
    $eot = $stmtEOT->fetch(PDO::FETCH_ASSOC);

    // Get midterm results
    $stmtMid = $pdo->prepare("
        SELECT * FROM midterm_results 
        WHERE STUDENT_ID = ? AND CLASS = ? AND TERM = ? AND YEAR = ?
    ");
    $stmtMid->execute([$student['STUDENT_ID'], $student['CLASS'], $term, $year]);
    $midterm = $stmtMid->fetch(PDO::FETCH_ASSOC);

    if (!$eot && !$midterm) {
        ob_end_clean();
        die('No report (midterm or end of term) found for the selected student.');
    }

    $pdf = new TCPDF('P', PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
    $pdf->SetCreator('Luzira COU Primary School');
    $pdf->SetAuthor('Luzira COU Primary School');
    $pdf->SetTitle("Class Report - $class");
    $pdf->setPrintHeader(false);
    $pdf->setPrintFooter(false);
    $pdf->SetMargins(5, 4, 5);
    $pdf->SetAutoPageBreak(TRUE, 10);
    $pdf->SetFont('helvetica', '', 10);

    $commentsMap = [
        'MTC' => [[0, 39, 'IMPROVE'], [40, 54, 'TRIED'], [55, 69, 'FAIR'], [70, 89, 'VGOOD'], [90, 100, 'EXCELLENT']],
        'ENG' => [[0, 39, 'IMPROVE'], [40, 54, 'TRIED'], [55, 69, 'FAIR'], [70, 89, 'VGOOD'], [90, 100, 'EXCELLENT']],
        'SST' => [[0, 39, 'IMPROVE'], [40, 54, 'TRIED'], [55, 69, 'FAIR'], [70, 89, 'VGOOD'], [90, 100, 'EXCELLENT']],
        'SCI' => [[0, 39, 'IMPROVE'], [40, 54, 'TRIED'], [55, 69, 'FAIR'], [70, 89, 'VGOOD'], [90, 100, 'EXCELLENT']]
    ];

    $initials = [
        'P1' => ['MTC' => 'KA', 'ENG' => 'MA', 'SST' => 'JJ', 'SCI' => 'LL'],
        'P2' => ['MTC' => 'KK', 'ENG' => 'HH', 'SST' => 'QQ', 'SCI' => 'DD'],
        'P3' => ['MTC' => 'MN', 'ENG' => 'PA', 'SST' => 'RR', 'SCI' => 'EE'],
        'P4' => ['MTC' => 'KS', 'ENG' => 'S', 'SST' => 'AS', 'SCI' => 'DM'],
        'P5' => ['MTC' => 'NR', 'ENG' => 'NR', 'SST' => 'AD', 'SCI' => 'RI'],
        'P6' => ['MTC' => 'AH', 'ENG' => 'AJ', 'SST' => 'BI', 'SCI' => 'BJ'],
        'P7' => ['MTC' => 'OD', 'ENG' => 'SE', 'SST' => 'AP', 'SCI' => 'BY']
    ];

    function getComment($subject, $mark, $commentsMap) {
        foreach ($commentsMap[$subject] as $range) {
            if ($mark >= $range[0] && $mark <= $range[1]) return $range[2];
        }
        return '';
    }

    // Header
    $pdf->AddPage();
    $pdf->Rect(5, 5, $pdf->getPageWidth() - 10, $pdf->getPageHeight() - 10);
    $pdf->Image('logo.png', 7, 5, 20);
    $pdf->SetFont('helvetica', 'B', 14);
    $pdf->Cell(0, 10, 'LUZIRA CHURCH OF UGANDA PRIMARY SCHOOL', 0, 1, 'C');
    $pdf->SetFont('helvetica', 'B', 11);
    $pdf->Cell(0, 5, "P.O.BOX 20061, KAMPALA - Uganda", 0, 1, 'C');
    $pdf->Cell(0, 5, "STUDENT'S TERMLY PROGRESSIVE REPORT - $term $year", 0, 1, 'C');

    // Student Details
    $student_position = $eot['POSITION'] ?? 'N/A';
    $pdf->writeHTML("<div style='background-color:#dbe4f3; padding:5px; font-weight:bold; font-size:12pt; color:#003366;'>Pupil's Details</div>", true, false, false, false, '');
    $pdf->writeHTML("<div style='line-height:1.5; font-size:10pt; padding-left:5px; padding-top:4px;'>
    <strong>ID:</strong> {$student['STUDENT_ID']}<br>
    <strong>Name:</strong> {$student['STUDENT_NAME']}<br>
    <strong>Class:</strong> {$student['CLASS']}<br>
    <strong>Sex:</strong> {$student['SEX']}<br>
    <strong>Position:</strong> {$student_position}
    </div>", true, false, false, false, '');

    // MIDTERM section
    if ($midterm) {
        $pdf->writeHTML('<h3 style="color:#007BFF;">MIDTERM RESULTS</h3>', true, false, false, false, '');
        $midtermTable = '<table border="1" cellpadding="4"><thead><tr style="background-color:#eee;"><th>LEARNING AREA</th><th>MARKS</th><th>OUT OF</th><th>AGG</th><th>COMMENT</th><th>INITIAL</th></tr></thead><tbody>';
        foreach ($commentsMap as $code => $ranges) {
            $mark = $midterm[$code] ?? 0;
            $agg = $midterm[$code.'_AGG'] ?? '';
            $comment = getComment($code, $mark, $commentsMap);
            $initial = $initials[$class][$code] ?? '';
            $midtermTable .= "<tr><td>$code</td><td>$mark</td><td>100</td><td>$agg</td><td>$comment</td><td>$initial</td></tr>";
        }
        $midtermTable .= "<tr style='font-weight:bold;'><td>TOTAL MARKS</td><td>{$midterm['TOTAL_MARKS']}</td><td>TOTAL AGG</td><td>{$midterm['TOTAL_AGG']}</td><td>DIVISION</td><td>{$midterm['DIVISION']}</td></tr>";
        $midtermTable .= "</tbody></table>";
        $pdf->writeHTML($midtermTable, true, false, false, false, '');
    }

    // END OF TERM section
    if ($eot) {
        $pdf->writeHTML('<h3 style="color:#28A745;">END OF TERM RESULTS</h3>', true, false, false, false, '');
        $eotTable = '<table border="1" cellpadding="4"><thead><tr style="background-color:#eee;"><th>LEARNING AREA</th><th>MARKS</th><th>OUT OF</th><th>AGG</th><th>COMMENT</th><th>INITIAL</th></tr></thead><tbody>';
        foreach ($commentsMap as $code => $ranges) {
            $mark = $eot[$code] ?? 0;
            $agg = $eot[$code.'_AGG'] ?? '';
            $comment = getComment($code, $mark, $commentsMap);
            $initial = $initials[$class][$code] ?? '';
            $eotTable .= "<tr><td>$code</td><td>$mark</td><td>100</td><td>$agg</td><td>$comment</td><td>$initial</td></tr>";
        }
        $eotTable .= "<tr style='font-weight:bold;'><td>TOTAL MARKS</td><td>{$eot['TOTAL_MARKS']}</td><td>TOTAL AGG</td><td>{$eot['TOTAL_AGG']}</td><td>DIVISION</td><td>{$eot['DIVISION']}</td></tr>";
        $eotTable .= "</tbody></table>";
        $pdf->writeHTML($eotTable, true, false, false, false, '');
    }

    // Remarks if EOT
    if ($eot && isset($eot['REMARKS'])) {
        $pdf->writeHTML("<strong>Class Teacher's Comment:</strong> " . $eot['REMARKS'], true, false, false, false, '');
    }

    // Requirements 
    $pdf->Ln(2);
    $pdf->SetFont('helvetica', 11);
    $pdf->writeHTML('<strong>Requirements</strong>', true, false, false, false, '');
    $requirementsTable = '<table border="1" cellpadding="2"><tr><th width="65%">ITEM</th><th width="35%">STATUS</th></tr><tr><td>PARENTS CONTRIBUTION:<br> P1-P2 Ugx75,000 P3-P6 Ugx85,000 P7 Ugx90,000</td><td>Paid at Bank with Pay Code</td></tr><tr><td>A REAM OF DOUBLE A/DOLOPHINE/ROTATRIM PAPER</td><td>Provided by parent</td></tr><tr><td>4 ROLLS OF TOILET PAPER</td><td>Provided by parent</td></tr></table>';
    $pdf->writeHTML($requirementsTable, true, false, false, false, '');

    //  HT Comment
    $div = $eot['DIVISION'] ?? $midterm['DIVISION'] ?? '';
    $ht_comment = 'Avoid missing exams.';
    if ($div === '1') $ht_comment = 'Excellent performance. Keep it up.';
    elseif ($div === '2') $ht_comment = 'Good work. Aim higher.';
    elseif ($div === '3') $ht_comment = 'Fair performance. Needs improvement.';
    elseif (in_array($div, ['4', 'U'])) $ht_comment = 'Work harder next time.';

    $pdf->Ln(2);
    $pdf->writeHTML('<strong>Headteacher\'s Comment:</strong> ' . $ht_comment, true, false, false, false, '');
    $pdf->Image('signature.png', $pdf->GetX(), $pdf->GetY(), 20);
    $pdf->Ln(18);
    $pdf->Cell(20, 3, 'Headteacher', 0, 1, 'L');

    $pdf->Ln(2);
    $pdf->SetFont('', 'BI');
    $pdf->SetTextColor(255, 255, 255);
    $pdf->SetFillColor(0, 0, 0);
    $pdf->Cell(0, 6, 'Disclaimer: These results can be verified via our website https://luziracouprimaryschool.com/', 0, 1, 'R', true);

    $filename = "{$student['STUDENT_NAME']}-{$class}-END OF TERM {$term} REPORT-{$year}.pdf";
    ob_end_clean();
    $pdf->Output($filename, 'I');
    exit;
}
?>
