<?php
declare(strict_types=1);
require_once __DIR__ . '/db/config.php';
require_once __DIR__ . '/includes/auth_helper.php';
Auth::requireLogin();

$tenant_id = (int)$_SESSION['tenant_id'];
$selected_year = (int)($_GET['year'] ?? date('Y'));

// 1. Get Company Settings
$stmt = db()->prepare("SELECT * FROM company_settings WHERE id = 1");
$stmt->execute();
$company = $stmt->fetch();

// 2. Determine Fiscal Year Range
$fiscal_end_raw = $company['fiscal_year_end'] ?? '12-31';
$fiscal_month = (int)date('m', strtotime($fiscal_end_raw));
$fiscal_day = (int)date('d', strtotime($fiscal_end_raw));

// If fiscal end is 2024-03-31, and selected year is 2024:
// Start: 2023-04-01, End: 2024-03-31
$end_date = sprintf('%d-%02d-%02d', $selected_year, $fiscal_month, $fiscal_day);
$start_date = date('Y-m-d', strtotime($end_date . ' -1 year +1 day'));

// 3. Fetch Projects active in this period (with labour or expenses)
$projects_query = "
    SELECT DISTINCT p.* 
    FROM projects p
    LEFT JOIN labour_entries le ON p.id = le.project_id AND le.entry_date BETWEEN ? AND ?
    LEFT JOIN expenses e ON p.id = e.project_id AND e.entry_date BETWEEN ? AND ?
    WHERE (le.id IS NOT NULL OR e.id IS NOT NULL)
    ORDER BY p.name ASC
";
$stmt = db()->prepare($projects_query);
$stmt->execute([$start_date, $end_date, $start_date, $end_date]);
$active_projects = $stmt->fetchAll();

// 4. Helper for Labour Data
function getLabourForProject($projectId, $start, $end) {
    $stmt = db()->prepare("
        SELECT le.*, e.name as employee_name, lt.name as labour_type
        FROM labour_entries le
        JOIN employees e ON le.employee_id = e.id
        LEFT JOIN labour_types lt ON le.labour_type_id = lt.id
        WHERE le.project_id = ? AND le.entry_date BETWEEN ? AND ?
        ORDER BY le.entry_date ASC
    ");
    $stmt->execute([$projectId, $start, $end]);
    return $stmt->fetchAll();
}

// 5. Helper for Expense Data
function getExpensesForProject($projectId, $start, $end) {
    $stmt = db()->prepare("
        SELECT e.*, s.name as supplier_name, et.name as expense_type
        FROM expenses e
        JOIN suppliers s ON e.supplier_id = s.id
        LEFT JOIN expense_types et ON e.expense_type_id = et.id
        WHERE e.project_id = ? AND e.entry_date BETWEEN ? AND ?
        ORDER BY e.entry_date ASC
    ");
    $stmt->execute([$projectId, $start, $end]);
    return $stmt->fetchAll();
}

// 6. Helper for Summary Calendar (Labour Hours)
$summary_labour_query = "
    SELECT p.id as project_id, p.name as project_name, DATE_FORMAT(le.entry_date, '%Y-%m') as month, SUM(le.hours) as total_hours, SUM(le.hours * IFNULL(le.hourly_rate, 0)) as total_cost
    FROM labour_entries le
    JOIN projects p ON le.project_id = p.id
    WHERE le.entry_date BETWEEN ? AND ?
    GROUP BY p.id, p.name, month
";
$stmt = db()->prepare($summary_labour_query);
$stmt->execute([$start_date, $end_date]);
$summary_labour_data = $stmt->fetchAll();

// 7. Helper for Summary Calendar (Expenses)
$summary_expense_query = "
    SELECT p.id as project_id, p.name as project_name, DATE_FORMAT(e.entry_date, '%Y-%m') as month, SUM(e.amount) as total_amount
    FROM expenses e
    JOIN projects p ON e.project_id = p.id
    WHERE e.entry_date BETWEEN ? AND ?
    GROUP BY p.id, p.name, month
";
$stmt = db()->prepare($summary_expense_query);
$stmt->execute([$start_date, $end_date]);
$summary_expense_data = $stmt->fetchAll();

// Organize Summary Data
$months = [];
try {
    $current_dt = new DateTime($start_date);
    $current_dt->modify('first day of this month');
    $end_dt = new DateTime($end_date);
    $end_dt->modify('first day of this month');

    while ($current_dt <= $end_dt) {
        $months[] = $current_dt->format('Y-m');
        $current_dt->modify('+1 month');
        if (count($months) > 13) break; // Safety for roughly 1 year
    }
} catch (Exception $e) {
    // Fallback if DateTime fails
    $months = [date('Y-m', strtotime($start_date))];
}

$labour_matrix = [];
$project_names = [];
foreach ($summary_labour_data as $row) {
    $pid = $row['project_id'];
    $project_names[$pid] = $row['project_name'];
    $labour_matrix[$pid][$row['month']] = ['hours' => $row['total_hours'], 'cost' => $row['total_cost']];
}

$expense_matrix = [];
foreach ($summary_expense_data as $row) {
    $pid = $row['project_id'];
    $project_names[$pid] = $row['project_name'];
    $expense_matrix[$pid][$row['month']] = $row['total_amount'];
}

$pageTitle = "SRED Claim Report - " . $selected_year;
?>
<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title><?= $pageTitle ?></title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.5/font/bootstrap-icons.css">
    <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
    <style>
        @media print {
            .no-print { display: none !important; }
            .page-break { page-break-before: always; }
            body { background: white; }
            .container { width: 100%; max-width: 100%; margin: 0; padding: 0; }
            .card { border: none !important; box-shadow: none !important; }
        }
        body { background: #f8f9fa; font-family: 'Inter', sans-serif; }
        .report-page { background: white; min-height: 297mm; padding: 20mm; margin: 20px auto; box-shadow: 0 0.5rem 1rem rgba(0,0,0,0.15); width: 210mm; }
        .title-page { display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; }
        .toc-item { display: flex; justify-content: space-between; border-bottom: 1px dotted #ccc; margin-bottom: 10px; }
        .chart-container { height: 300px; }
        .table-tight th, .table-tight td { padding: 4px 8px; font-size: 0.85rem; }
        .calendar-table th, .calendar-table td { font-size: 0.75rem; text-align: center; vertical-align: middle; }
    </style>
</head>
<body>

<div class="no-print bg-dark text-white p-3 sticky-top shadow d-flex justify-content-between align-items-center">
    <div>
        <a href="sred_claim_report_selector.php" class="btn btn-sm btn-outline-light me-2"><i class="bi bi-arrow-left"></i> Back</a>
        <strong>SRED Claim Report Generator</strong>
    </div>
    <button onclick="window.print()" class="btn btn-primary btn-sm"><i class="bi bi-printer"></i> Print Report / Save PDF</button>
</div>

<!-- PAGE 1: TITLE PAGE -->
<div class="report-page title-page">
    <?php if (!empty($company['logo_path'])): ?>
        <img src="<?= htmlspecialchars($company['logo_path']) ?>" alt="Logo" class="mb-5" style="max-height: 150px;">
    <?php endif; ?>
    
    <div style="margin-top: auto; margin-bottom: auto;">
        <h1 class="display-3 fw-bold mb-4"><?= htmlspecialchars($company['company_name'] ?? 'Company Name') ?></h1>
        <h2 class="text-primary mb-5">SRED CLAIM REPORT</h2>
        <h4 class="text-muted">Fiscal Year: <?= $selected_year ?></h4>
        <p class="mt-3 text-muted">Range: <?= date('M d, Y', strtotime($start_date)) ?> to <?= date('M d, Y', strtotime($end_date)) ?></p>
    </div>
    
    <div class="mt-auto border-top pt-4 w-100">
        <p class="mb-1 fw-bold"><?= htmlspecialchars($company['address_1'] ?? '') ?></p>
        <?php if ($company['address_2']): ?><p class="mb-1"><?= htmlspecialchars($company['address_2']) ?></p><?php endif; ?>
        <p class="mb-1"><?= htmlspecialchars($company['city'] ?? '') ?>, <?= htmlspecialchars($company['province'] ?? '') ?> <?= htmlspecialchars($company['postal_code'] ?? '') ?></p>
        <p class="mb-1">Phone: <?= htmlspecialchars($company['phone'] ?? '') ?> | Email: <?= htmlspecialchars($company['email'] ?? '') ?></p>
        <p class="mb-0">Website: <?= htmlspecialchars($company['website'] ?? '') ?></p>
        <?php if ($company['business_number']): ?>
            <p class="mt-2 fw-bold">Business Number: <?= htmlspecialchars($company['business_number']) ?></p>
        <?php endif; ?>
    </div>
</div>

<!-- PAGE 2: TABLE OF CONTENTS -->
<div class="report-page page-break">
    <h2 class="mb-5 border-bottom pb-3">Table of Contents</h2>
    <div class="mt-4">
        <div class="toc-item"><span>1. Title Page</span><span>1</span></div>
        <div class="toc-item"><span>2. Table of Contents</span><span>2</span></div>
        <?php 
        $page_counter = 3;
        foreach ($active_projects as $p): 
            $proj_start_page = $page_counter;
        ?>
            <div class="toc-item fw-bold mt-3"><span>Project: <?= htmlspecialchars($p['name']) ?></span><span><?= $page_counter++ ?></span></div>
            <div class="toc-item ps-4 text-muted"><span>Insights & Charts</span><span><?= ($page_counter - 1) ?></span></div>
            <div class="toc-item ps-4 text-muted"><span>Labour Detail Report</span><span><?= $page_counter++ ?></span></div>
            <div class="toc-item ps-4 text-muted"><span>Expense Detail Report</span><span><?= $page_counter++ ?></span></div>
        <?php endforeach; ?>
        <div class="toc-item fw-bold mt-4"><span>Summarized Claim (Calendar Views)</span><span><?= $page_counter++ ?></span></div>
        <div class="toc-item ps-4 text-muted"><span>Labour Summary</span><span><?= ($page_counter - 1) ?></span></div>
        <div class="toc-item ps-4 text-muted"><span>Expense Summary</span><span><?= $page_counter++ ?></span></div>
    </div>
</div>

<!-- PROJECT PAGES -->
<?php foreach ($active_projects as $idx => $project): 
    $labour = getLabourForProject($project['id'], $start_date, $end_date);
    $expenses = getExpensesForProject($project['id'], $start_date, $end_date);
    
    // Process Insights
    $employee_hours = [];
    $labour_type_hours = [];
    $total_proj_hours = 0;
    $total_proj_labour_cost = 0;
    foreach ($labour as $l) {
        $employee_hours[$l['employee_name']] = ($employee_hours[$l['employee_name']] ?? 0) + (float)$l['hours'];
        $labour_type_hours[$l['labour_type'] ?? 'Other'] = ($labour_type_hours[$l['labour_type'] ?? 'Other'] ?? 0) + (float)$l['hours'];
        $total_proj_hours += (float)$l['hours'];
        $total_proj_labour_cost += (float)$l['hours'] * (float)($l['hourly_rate'] ?? 0);
    }
    arsort($employee_hours);
    $top_employees = array_slice($employee_hours, 0, 5, true);

    $total_proj_expenses = 0;
    foreach ($expenses as $e) {
        $total_proj_expenses += (float)$e['amount'];
    }
?>
    <!-- Project Page 1: Insights -->
    <div class="report-page page-break">
        <div class="d-flex justify-content-between align-items-start mb-4 border-bottom pb-3">
            <div>
                <h6 class="text-uppercase text-primary fw-bold mb-1">Project Analysis</h6>
                <h2 class="mb-0"><?= htmlspecialchars($project['name']) ?></h2>
            </div>
            <div class="text-end">
                <span class="badge bg-light text-dark border">Project ID: <?= htmlspecialchars($project['code'] ?? $project['id']) ?></span>
            </div>
        </div>
        
        <p class="lead text-muted mb-4"><?= nl2br(htmlspecialchars($project['description'] ?? 'No project description available.')) ?></p>
        
        <div class="row mb-5">
            <div class="col-6">
                <div class="card bg-light border-0">
                    <div class="card-body">
                        <h6 class="text-muted small text-uppercase">Total Labour Hours</h6>
                        <h3 class="mb-0 fw-bold"><?= number_format($total_proj_hours, 1) ?> h</h3>
                    </div>
                </div>
            </div>
            <div class="col-6">
                <div class="card bg-light border-0">
                    <div class="card-body">
                        <h6 class="text-muted small text-uppercase">Total Estimated Cost</h6>
                        <h3 class="mb-0 fw-bold text-success">$<?= number_format($total_proj_labour_cost + $total_proj_expenses, 2) ?></h3>
                    </div>
                </div>
            </div>
        </div>

        <div class="row">
            <div class="col-6">
                <h6 class="fw-bold mb-3">Top Employees by Hours</h6>
                <div class="chart-container">
                    <canvas id="chart_emp_<?= $project['id'] ?>"></canvas>
                </div>
            </div>
            <div class="col-6">
                <h6 class="fw-bold mb-3">Labour by Category</h6>
                <div class="chart-container">
                    <canvas id="chart_type_<?= $project['id'] ?>"></canvas>
                </div>
            </div>
        </div>
        
        <script>
            new Chart(document.getElementById('chart_emp_<?= $project['id'] ?>').getContext('2d'), {
                type: 'bar',
                data: {
                    labels: <?= json_encode(array_keys($top_employees)) ?>,
                    datasets: [{
                        label: 'Hours',
                        data: <?= json_encode(array_values($top_employees)) ?>,
                        backgroundColor: '#0d6efd'
                    }]
                },
                options: { responsive: true, maintainAspectRatio: false, plugins: { legend: { display: false } } }
            });
            new Chart(document.getElementById('chart_type_<?= $project['id'] ?>').getContext('2d'), {
                type: 'doughnut',
                data: {
                    labels: <?= json_encode(array_keys($labour_type_hours)) ?>,
                    datasets: [{
                        data: <?= json_encode(array_values($labour_type_hours)) ?>,
                        backgroundColor: ['#0d6efd', '#198754', '#ffc107', '#0dcaf0', '#6c757d']
                    }]
                },
                options: { responsive: true, maintainAspectRatio: false }
            });
        </script>
    </div>

    <!-- Project Page 2: Labour Details -->
    <div class="report-page page-break">
        <h4 class="mb-4 border-bottom pb-2">Labour Detail Report: <?= htmlspecialchars($project['name']) ?></h4>
        <table class="table table-bordered table-tight">
            <thead class="bg-light">
                <tr>
                    <th>Date</th>
                    <th>Employee</th>
                    <th>Activity Type</th>
                    <th class="text-end">Hours</th>
                    <th class="text-end">Rate</th>
                    <th class="text-end">Total Wage</th>
                </tr>
            </thead>
            <tbody>
                <?php if (empty($labour)): ?>
                    <tr><td colspan="6" class="text-center text-muted">No labour entries recorded.</td></tr>
                <?php endif; ?>
                <?php foreach ($labour as $l): 
                    $cost = (float)$l['hours'] * (float)($l['hourly_rate'] ?? 0);
                ?>
                    <tr>
                        <td><?= $l['entry_date'] ?></td>
                        <td><?= htmlspecialchars($l['employee_name']) ?></td>
                        <td><?= htmlspecialchars($l['labour_type'] ?? 'N/A') ?></td>
                        <td class="text-end"><?= number_format((float)$l['hours'], 2) ?></td>
                        <td class="text-end"><?= $l['hourly_rate'] ? '$'.number_format((float)$l['hourly_rate'], 2) : '-' ?></td>
                        <td class="text-end fw-bold"><?= $cost > 0 ? '$'.number_format($cost, 2) : '-' ?></td>
                    </tr>
                <?php endforeach; ?>
            </tbody>
            <tfoot class="bg-light">
                <tr>
                    <td colspan="3" class="text-end fw-bold">Project Totals:</td>
                    <td class="text-end fw-bold text-primary"><?= number_format($total_proj_hours, 2) ?> h</td>
                    <td></td>
                    <td class="text-end fw-bold text-success">$<?= number_format($total_proj_labour_cost, 2) ?></td>
                </tr>
            </tfoot>
        </table>
        <div class="mt-4 extra-small text-muted">
            Note: Hourly rates are recorded at the time of entry to reflect historical wage adjustments accurately.
        </div>
    </div>

    <!-- Project Page 3: Expense Details -->
    <div class="report-page page-break">
        <h4 class="mb-4 border-bottom pb-2">Expense Detail Report: <?= htmlspecialchars($project['name']) ?></h4>
        <table class="table table-bordered table-tight">
            <thead class="bg-light">
                <tr>
                    <th>Date</th>
                    <th>Supplier</th>
                    <th>Expense Type</th>
                    <th>Notes</th>
                    <th class="text-end">Allocation</th>
                    <th class="text-end">Amount</th>
                </tr>
            </thead>
            <tbody>
                <?php if (empty($expenses)): ?>
                    <tr><td colspan="6" class="text-center text-muted">No expenses recorded.</td></tr>
                <?php endif; ?>
                <?php foreach ($expenses as $e): ?>
                    <tr>
                        <td><?= $e['entry_date'] ?></td>
                        <td><?= htmlspecialchars($e['supplier_name']) ?></td>
                        <td><?= htmlspecialchars($e['expense_type'] ?? 'N/A') ?></td>
                        <td style="max-width: 200px;" class="text-truncate"><?= htmlspecialchars($e['notes'] ?? '') ?></td>
                        <td class="text-end"><?= number_format((float)$e['allocation_percent'], 0) ?>%</td>
                        <td class="text-end fw-bold">$<?= number_format((float)$e['amount'], 2) ?></td>
                    </tr>
                <?php endforeach; ?>
            </tbody>
            <tfoot class="bg-light">
                <tr>
                    <td colspan="5" class="text-end fw-bold">Total Expenses:</td>
                    <td class="text-end fw-bold text-success">$<?= number_format($total_proj_expenses, 2) ?></td>
                </tr>
            </tfoot>
        </table>
    </div>
<?php endforeach; ?>

<!-- SUMMARIZED CLAIM - LABOUR -->
<div class="report-page page-break">
    <h3 class="mb-4 border-bottom pb-2">Summarized Claim: Monthly Labour Hours</h3>
    <div class="table-responsive">
        <table class="table table-bordered calendar-table">
            <thead class="bg-light">
                <tr>
                    <th class="text-start">Project Name</th>
                    <?php foreach ($months as $m): ?>
                        <th><?= date('M y', strtotime($m)) ?></th>
                    <?php endforeach; ?>
                    <th class="bg-secondary text-white">Total $</th>
                </tr>
            </thead>
            <tbody>
                <?php 
                $grand_total_hours = 0;
                $grand_total_cost = 0;
                foreach ($labour_matrix as $pid => $data): 
                    $row_cost = 0;
                    $pname = $project_names[$pid] ?? 'Unknown Project';
                ?>
                    <tr>
                        <td class="text-start fw-bold"><?= htmlspecialchars($pname) ?></td>
                        <?php foreach ($months as $m): 
                            $h = (float)($data[$m]['hours'] ?? 0);
                            $c = (float)($data[$m]['cost'] ?? 0);
                            $row_cost += $c;
                            $grand_total_hours += $h;
                        ?>
                            <td><?= $h > 0 ? number_format($h, 1) : '-' ?></td>
                        <?php endforeach; ?>
                        <td class="fw-bold">$<?= number_format($row_cost, 0) ?></td>
                    </tr>
                <?php 
                    $grand_total_cost += $row_cost;
                endforeach; ?>
            </tbody>
            <tfoot class="bg-light fw-bold">
                <tr>
                    <td class="text-start">Monthly Totals</td>
                    <?php foreach ($months as $m): 
                        $m_hours = 0;
                        foreach($labour_matrix as $pid => $d) $m_hours += (float)($d[$m]['hours'] ?? 0);
                    ?>
                        <td><?= $m_hours > 0 ? number_format($m_hours, 1) : '-' ?></td>
                    <?php endforeach; ?>
                    <td class="text-success">$<?= number_format($grand_total_cost, 2) ?></td>
                </tr>
            </tfoot>
        </table>
    </div>
    <p class="small text-muted mt-3">All amounts are calculated using the recorded hourly rate at the time of labour entry.</p>
</div>

<!-- SUMMARIZED CLAIM - EXPENSES -->
<div class="report-page page-break">
    <h3 class="mb-4 border-bottom pb-2">Summarized Claim: Monthly Expenses</h3>
    <div class="table-responsive">
        <table class="table table-bordered calendar-table">
            <thead class="bg-light">
                <tr>
                    <th class="text-start">Project Name</th>
                    <?php foreach ($months as $m): ?>
                        <th><?= date('M y', strtotime($m)) ?></th>
                    <?php endforeach; ?>
                    <th class="bg-secondary text-white">Total $</th>
                </tr>
            </thead>
            <tbody>
                <?php 
                $grand_total_expense = 0;
                foreach ($expense_matrix as $pid => $data): 
                    $row_amount = 0;
                    $pname = $project_names[$pid] ?? 'Unknown Project';
                ?>
                    <tr>
                        <td class="text-start fw-bold"><?= htmlspecialchars($pname) ?></td>
                        <?php foreach ($months as $m): 
                            $a = (float)($data[$m] ?? 0);
                            $row_amount += $a;
                        ?>
                            <td><?= $a > 0 ? '$'.number_format($a, 0) : '-' ?></td>
                        <?php endforeach; ?>
                        <td class="fw-bold">$<?= number_format($row_amount, 0) ?></td>
                    </tr>
                <?php 
                    $grand_total_expense += $row_amount;
                endforeach; ?>
            </tbody>
            <tfoot class="bg-light fw-bold">
                <tr>
                    <td class="text-start">Monthly Totals</td>
                    <?php foreach ($months as $m): 
                        $m_amt = 0;
                        foreach($expense_matrix as $pid => $d) $m_amt += (float)($d[$m] ?? 0);
                    ?>
                        <td><?= $m_amt > 0 ? '$'.number_format($m_amt, 0) : '-' ?></td>
                    <?php endforeach; ?>
                    <td class="text-success">$<?= number_format($grand_total_expense, 2) ?></td>
                </tr>
            </tfoot>
        </table>
    </div>
    
    <div class="mt-5 text-center">
        <div class="border p-4 d-inline-block">
            <h5 class="text-uppercase text-muted small mb-3">Total Captured Wages and Expenses for SR&ED Claim</h5>
            <h1 class="display-4 fw-bold text-primary">$<?= number_format($grand_total_cost + $grand_total_expense, 2) ?></h1>
            <p class="mb-0 text-muted">Includes all Labour Wages and Project Expenses for Fiscal Year <?= $selected_year ?></p>
        </div>
    </div>
</div>

<footer class="no-print mt-5 text-center p-4 text-muted border-top bg-white">
    SR&ED Manager Claim Report Generator | &copy; <?= date('Y') ?>
</footer>

</body>
</html>