<?php
/**
 * Settings Page - Manage System Datasets
 */
declare(strict_types=1);
require_once __DIR__ . '/db/config.php';

$tenant_id = 1;

// Handle Form Submissions
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $action = $_POST['action'] ?? '';
    $id = (int)($_POST['id'] ?? 0);
    $name = $_POST['name'] ?? '';
    $error = '';

    if ($action === 'add_labour_type' && $name) {
        $stmt = db()->prepare("INSERT INTO labour_types (tenant_id, name) VALUES (?, ?)");
        $stmt->execute([$tenant_id, $name]);
    } elseif ($action === 'edit_labour_type' && $id && $name) {
        $stmt = db()->prepare("UPDATE labour_types SET name = ? WHERE id = ? AND tenant_id = ?");
        $stmt->execute([$name, $id, $tenant_id]);
    } elseif ($action === 'delete_labour_type' && $id) {
        $check = db()->prepare("SELECT COUNT(*) FROM labour_entries WHERE labour_type_id = ? AND tenant_id = ?");
        $check->execute([$id, $tenant_id]);
        if ($check->fetchColumn() > 0) {
            $error = "Cannot delete: Labour type is used in labour entries.";
        } else {
            $stmt = db()->prepare("DELETE FROM labour_types WHERE id = ? AND tenant_id = ?");
            $stmt->execute([$id, $tenant_id]);
        }
    } 
    
    elseif ($action === 'add_evidence_type' && $name) {
        $stmt = db()->prepare("INSERT INTO evidence_types (tenant_id, name) VALUES (?, ?)");
        $stmt->execute([$tenant_id, $name]);
    } elseif ($action === 'edit_evidence_type' && $id && $name) {
        $stmt = db()->prepare("UPDATE evidence_types SET name = ? WHERE id = ? AND tenant_id = ?");
        $stmt->execute([$name, $id, $tenant_id]);
    } elseif ($action === 'delete_evidence_type' && $id) {
        $check = db()->prepare("SELECT COUNT(*) FROM labour_entries WHERE evidence_type_id = ? AND tenant_id = ?");
        $check->execute([$id, $tenant_id]);
        if ($check->fetchColumn() > 0) {
            $error = "Cannot delete: Evidence type is used in labour entries.";
        } else {
            $stmt = db()->prepare("DELETE FROM evidence_types WHERE id = ? AND tenant_id = ?");
            $stmt->execute([$id, $tenant_id]);
        }
    }

    elseif ($action === 'add_expense_type' && $name) {
        $stmt = db()->prepare("INSERT INTO expense_types (tenant_id, name) VALUES (?, ?)");
        $stmt->execute([$tenant_id, $name]);
    } elseif ($action === 'edit_expense_type' && $id && $name) {
        $stmt = db()->prepare("UPDATE expense_types SET name = ? WHERE id = ? AND tenant_id = ?");
        $stmt->execute([$name, $id, $tenant_id]);
    } elseif ($action === 'delete_expense_type' && $id) {
        $check = db()->prepare("SELECT COUNT(*) FROM expenses WHERE expense_type_id = ? AND tenant_id = ?");
        $check->execute([$id, $tenant_id]);
        if ($check->fetchColumn() > 0) {
            $error = "Cannot delete: Expense type is used in expense logs.";
        } else {
            $stmt = db()->prepare("DELETE FROM expense_types WHERE id = ? AND tenant_id = ?");
            $stmt->execute([$id, $tenant_id]);
        }
    }

    elseif ($action === 'add_team' && $name) {
        $stmt = db()->prepare("INSERT INTO teams (tenant_id, name) VALUES (?, ?)");
        $stmt->execute([$tenant_id, $name]);
    } elseif ($action === 'edit_team' && $id && $name) {
        $stmt = db()->prepare("UPDATE teams SET name = ? WHERE id = ? AND tenant_id = ?");
        $stmt->execute([$name, $id, $tenant_id]);
    } elseif ($action === 'delete_team' && $id) {
        $check = db()->prepare("SELECT COUNT(*) FROM employee_teams WHERE team_id = ? AND tenant_id = ?");
        $check->execute([$id, $tenant_id]);
        if ($check->fetchColumn() > 0) {
            $error = "Cannot delete: Team has assigned employees.";
        } else {
            $stmt = db()->prepare("DELETE FROM teams WHERE id = ? AND tenant_id = ?");
            $stmt->execute([$id, $tenant_id]);
        }
    }

    if ($error) {
        header("Location: settings.php?error=" . urlencode($error));
    } else {
        header("Location: settings.php?success=1");
    }
    exit;
}

// Fetch all datasets
$labourTypes = db()->prepare("SELECT * FROM labour_types WHERE tenant_id = ? ORDER BY name");
$labourTypes->execute([$tenant_id]);
$labourTypeList = $labourTypes->fetchAll();

$evidenceTypes = db()->prepare("SELECT * FROM evidence_types WHERE tenant_id = ? ORDER BY name");
$evidenceTypes->execute([$tenant_id]);
$evidenceTypeList = $evidenceTypes->fetchAll();

$expenseTypes = db()->prepare("SELECT * FROM expense_types WHERE tenant_id = ? ORDER BY name");
$expenseTypes->execute([$tenant_id]);
$expenseTypeList = $expenseTypes->fetchAll();

$teams = db()->prepare("SELECT * FROM teams WHERE tenant_id = ? ORDER BY name");
$teams->execute([$tenant_id]);
$teamList = $teams->fetchAll();

$pageTitle = "SR&ED Manager - Settings";
include __DIR__ . '/includes/header.php';
?>

<div class="container-fluid py-4">
    <div class="row">
        <div class="col-12">
            <div class="d-flex justify-content-between align-items-center mb-4">
                <h4 class="fw-bold mb-0">System Settings & Datasets</h4>
                <div class="d-flex gap-2">
                    <?php if (isset($_GET['success'])): ?>
                        <span class="badge bg-success py-2 px-3">Dataset updated successfully</span>
                    <?php endif; ?>
                    <?php if (isset($_GET['error'])): ?>
                        <span class="badge bg-danger py-2 px-3"><?= htmlspecialchars($_GET['error']) ?></span>
                    <?php endif; ?>
                </div>
            </div>
            
            <div class="row">
                <!-- Labour Types -->
                <div class="col-md-6 mb-4">
                    <div class="card h-100 border-0 shadow-sm">
                        <div class="card-header bg-white d-flex justify-content-between align-items-center">
                            <span class="fw-bold">Labour Types</span>
                            <button class="btn btn-sm btn-outline-primary" data-bs-toggle="modal" data-bs-target="#addLabourTypeModal">+ Add</button>
                        </div>
                        <div class="table-responsive">
                            <table class="table table-hover align-middle mb-0">
                                <thead><tr><th>Name</th><th class="text-end">Actions</th></tr></thead>
                                <tbody>
                                    <?php foreach ($labourTypeList as $item): ?>
                                        <tr>
                                            <td><?= htmlspecialchars($item['name']) ?></td>
                                            <td class="text-end">
                                                <button class="btn btn-sm btn-link text-primary p-0 me-2" onclick="editItem('edit_labour_type', <?= $item['id'] ?>, '<?= addslashes($item['name']) ?>')">Edit</button>
                                                <button class="btn btn-sm btn-link text-danger p-0" onclick="deleteItem('delete_labour_type', <?= $item['id'] ?>)">Delete</button>
                                            </td>
                                        </tr>
                                    <?php endforeach; ?>
                                </tbody>
                            </table>
                        </div>
                    </div>
                </div>

                <!-- Evidence Types -->
                <div class="col-md-6 mb-4">
                    <div class="card h-100 border-0 shadow-sm">
                        <div class="card-header bg-white d-flex justify-content-between align-items-center">
                            <span class="fw-bold">Evidence Types</span>
                            <button class="btn btn-sm btn-outline-primary" data-bs-toggle="modal" data-bs-target="#addEvidenceTypeModal">+ Add</button>
                        </div>
                        <div class="table-responsive">
                            <table class="table table-hover align-middle mb-0">
                                <thead><tr><th>Name</th><th class="text-end">Actions</th></tr></thead>
                                <tbody>
                                    <?php foreach ($evidenceTypeList as $item): ?>
                                        <tr>
                                            <td><?= htmlspecialchars($item['name']) ?></td>
                                            <td class="text-end">
                                                <button class="btn btn-sm btn-link text-primary p-0 me-2" onclick="editItem('edit_evidence_type', <?= $item['id'] ?>, '<?= addslashes($item['name']) ?>')">Edit</button>
                                                <button class="btn btn-sm btn-link text-danger p-0" onclick="deleteItem('delete_evidence_type', <?= $item['id'] ?>)">Delete</button>
                                            </td>
                                        </tr>
                                    <?php endforeach; ?>
                                </tbody>
                            </table>
                        </div>
                    </div>
                </div>

                <!-- Expense Types -->
                <div class="col-md-6 mb-4">
                    <div class="card h-100 border-0 shadow-sm">
                        <div class="card-header bg-white d-flex justify-content-between align-items-center">
                            <span class="fw-bold">Expense Types</span>
                            <button class="btn btn-sm btn-outline-primary" data-bs-toggle="modal" data-bs-target="#addExpenseTypeModal">+ Add</button>
                        </div>
                        <div class="table-responsive">
                            <table class="table table-hover align-middle mb-0">
                                <thead><tr><th>Name</th><th class="text-end">Actions</th></tr></thead>
                                <tbody>
                                    <?php foreach ($expenseTypeList as $item): ?>
                                        <tr>
                                            <td><?= htmlspecialchars($item['name']) ?></td>
                                            <td class="text-end">
                                                <button class="btn btn-sm btn-link text-primary p-0 me-2" onclick="editItem('edit_expense_type', <?= $item['id'] ?>, '<?= addslashes($item['name']) ?>')">Edit</button>
                                                <button class="btn btn-sm btn-link text-danger p-0" onclick="deleteItem('delete_expense_type', <?= $item['id'] ?>)">Delete</button>
                                            </td>
                                        </tr>
                                    <?php endforeach; ?>
                                </tbody>
                            </table>
                        </div>
                    </div>
                </div>

                <!-- Teams -->
                <div class="col-md-6 mb-4">
                    <div class="card h-100 border-0 shadow-sm">
                        <div class="card-header bg-white d-flex justify-content-between align-items-center">
                            <span class="fw-bold">Teams</span>
                            <button class="btn btn-sm btn-outline-primary" data-bs-toggle="modal" data-bs-target="#addTeamModal">+ Add</button>
                        </div>
                        <div class="table-responsive">
                            <table class="table table-hover align-middle mb-0">
                                <thead><tr><th>Name</th><th class="text-end">Actions</th></tr></thead>
                                <tbody>
                                    <?php foreach ($teamList as $item): ?>
                                        <tr>
                                            <td><?= htmlspecialchars($item['name']) ?></td>
                                            <td class="text-end">
                                                <button class="btn btn-sm btn-link text-primary p-0 me-2" onclick="editItem('edit_team', <?= $item['id'] ?>, '<?= addslashes($item['name']) ?>')">Edit</button>
                                                <button class="btn btn-sm btn-link text-danger p-0" onclick="deleteItem('delete_team', <?= $item['id'] ?>)">Delete</button>
                                            </td>
                                        </tr>
                                    <?php endforeach; ?>
                                </tbody>
                            </table>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<div class="modal fade" id="editItemModal" tabindex="-1">
    <div class="modal-dialog modal-dialog-centered">
        <div class="modal-content border-0 shadow">
            <div class="modal-header"><h5 class="modal-title fw-bold" id="editItemTitle">Edit Item</h5><button type="button" class="btn-close" data-bs-dismiss="modal"></button></div>
            <form method="POST">
                <div class="modal-body">
                    <input type="hidden" name="action" id="editItemAction">
                    <input type="hidden" name="id" id="editItemId">
                    <div class="mb-3">
                        <label class="form-label small fw-bold">Name</label>
                        <input type="text" name="name" id="editItemName" class="form-control" required>
                    </div>
                </div>
                <div class="modal-footer border-0"><button type="submit" class="btn btn-primary px-4">Save Changes</button></div>
            </form>
        </div>
    </div>
</div>

<form id="deleteForm" method="POST" style="display:none;">
    <input type="hidden" name="action" id="deleteAction">
    <input type="hidden" name="id" id="deleteId">
</form>

<script>
function editItem(action, id, name) {
    document.getElementById('editItemAction').value = action;
    document.getElementById('editItemId').value = id;
    document.getElementById('editItemName').value = name;
    document.getElementById('editItemTitle').innerText = 'Edit ' + action.replace('edit_', '').replace('_', ' ').replace(/\b\w/g, l => l.toUpperCase());
    new bootstrap.Modal(document.getElementById('editItemModal')).show();
}

function deleteItem(action, id) {
    if (confirm('Are you sure you want to delete this item? This action cannot be undone.')) {
        document.getElementById('deleteAction').value = action;
        document.getElementById('deleteId').value = id;
        document.getElementById('deleteForm').submit();
    }
}
</script>

<!-- Modals -->
<?php
$modals = [
    ['id' => 'addLabourTypeModal', 'title' => 'Add Labour Type', 'action' => 'add_labour_type'],
    ['id' => 'addEvidenceTypeModal', 'title' => 'Add Evidence Type', 'action' => 'add_evidence_type'],
    ['id' => 'addExpenseTypeModal', 'title' => 'Add Expense Type', 'action' => 'add_expense_type'],
    ['id' => 'addTeamModal', 'title' => 'Add Team', 'action' => 'add_team'],
];
foreach ($modals as $m):
?>
<div class="modal fade" id="<?= $m['id'] ?>" tabindex="-1">
    <div class="modal-dialog modal-dialog-centered">
        <div class="modal-content border-0 shadow">
            <div class="modal-header"><h5 class="modal-title fw-bold"><?= $m['title'] ?></h5><button type="button" class="btn-close" data-bs-dismiss="modal"></button></div>
            <form method="POST">
                <div class="modal-body">
                    <input type="hidden" name="action" value="<?= $m['action'] ?>">
                    <div class="mb-3">
                        <label class="form-label small fw-bold">Name</label>
                        <input type="text" name="name" class="form-control" placeholder="Enter name..." required>
                    </div>
                </div>
                <div class="modal-footer border-0"><button type="submit" class="btn btn-primary px-4">Add Item</button></div>
            </form>
        </div>
    </div>
</div>
<?php endforeach; ?>

<?php include __DIR__ . '/includes/footer.php'; ?>