<?php
declare(strict_types=1);

require_once __DIR__ . '/includes/layout.php'; require_login();
require_once __DIR__ . '/includes/NotificationService.php';

ensure_schema();

$shipmentId = (int) ($_GET['id'] ?? 0);
$shipment = null;

if ($shipmentId > 0) {
    $stmt = db()->prepare("SELECT * FROM shipments WHERE id = :id");
    $stmt->execute([':id' => $shipmentId]);
    $shipment = $stmt->fetch();
}

$errors = [];
$flash = get_flash();
$userRole = $_SESSION['user_role'] ?? '';
$currentUserId = isset($_SESSION['user_id']) ? (int)$_SESSION['user_id'] : 0;
$isAdmin = $userRole === 'admin';
$isShipper = $userRole === 'shipper';
$isTruckOwner = $userRole === 'truck_owner';
$isAssignedTruckOwner = $shipment && $shipment['truck_owner_id'] == $currentUserId;

// Platform Fee Configuration
$settings = get_settings();
$platformFeePercentage = (float)($settings['platform_charge_percentage'] ?? 0) / 100;
$pricingModel = $settings['pricing_model'] ?? 'percentage';

// Handle POST actions
if ($_SERVER['REQUEST_METHOD'] === 'POST') { validate_csrf_token();
    $action = $_POST['action'] ?? '';

    if ($action === 'submit_offer') { if (!$isTruckOwner && !$isAdmin) { $errors[] = 'Only truck owners can submit offers.'; }
        $offerOwner = trim($_POST['offer_owner'] ?? '');
        $offerPrice = trim($_POST['offer_price'] ?? '');
        
        // Enforce fixed price logic if applicable
        if ($pricingModel === 'fixed_price' && !empty($shipment['target_price'])) {
            $offerPrice = $shipment['target_price'];
        }

        if ($offerOwner === '' || $offerPrice === '') {
            $errors[] = t('error_required');
        } elseif (!is_numeric($offerPrice)) {
            $errors[] = t('error_invalid');
        } else {
            $truckOwnerId = isset($_SESSION['user_id']) ? (int)$_SESSION['user_id'] : null;
            
            $stmt = db()->prepare(
                "UPDATE shipments SET offer_owner = :offer_owner, offer_price = :offer_price, status = 'offered', truck_owner_id = :truck_owner_id
                 WHERE id = :id"
            );
            $stmt->execute([
                ':offer_owner' => $offerOwner,
                ':offer_price' => $offerPrice,
                ':truck_owner_id' => $truckOwnerId,
                ':id' => $shipmentId,
            ]);

            // Notify Shipper
            if (!empty($shipment['shipper_id'])) {
                $shipperUser = db()->query("SELECT * FROM users WHERE id = " . (int)$shipment['shipper_id'])->fetch();
                if ($shipperUser) {
                    NotificationService::send('shipment_offered', $shipperUser, [
                        'shipment_id' => $shipmentId,
                        'offer_price' => $offerPrice,
                        'offer_owner' => $offerOwner
                    ]);
                }
            }

            set_flash('success', t('success_offer'));
            header('Location: ' . url_with_lang('shipment_detail.php', ['id' => $shipmentId]));
            exit;
        }
    } elseif ($action === 'accept_offer' && $isShipper) {
        if ($shipment && $shipment['status'] === 'offered' && $shipment['offer_price'] > 0) {
            $offerPrice = (float)$shipment['offer_price'];
            $platformFee = $offerPrice * $platformFeePercentage;
            $totalPrice = $offerPrice + $platformFee;

            $stmt = db()->prepare(
                "UPDATE shipments 
                 SET status = 'confirmed', 
                     payment_status = 'paid', 
                     platform_fee = :fee, 
                     total_price = :total 
                 WHERE id = :id"
            );
            $stmt->execute([
                ':fee' => $platformFee,
                ':total' => $totalPrice,
                ':id' => $shipmentId
            ]);
            
            // Notify Truck Owner
            if (!empty($shipment['truck_owner_id'])) {
                $truckOwnerUser = db()->query("SELECT * FROM users WHERE id = " . (int)$shipment['truck_owner_id'])->fetch();
                if ($truckOwnerUser) {
                    NotificationService::send('shipment_accepted', $truckOwnerUser, [
                        'shipment_id' => $shipmentId
                    ]);
                }
            }

            set_flash('success', t('Payment successful. Shipment confirmed!'));
            header('Location: ' . url_with_lang('shipment_detail.php', ['id' => $shipmentId]));
            exit;
        }
    } elseif ($action === 'reject_offer' && $isShipper) {
        if ($shipment && $shipment['status'] === 'offered') {
            // Notify Truck Owner first (before clearing ID)
            if (!empty($shipment['truck_owner_id'])) {
                $truckOwnerUser = db()->query("SELECT * FROM users WHERE id = " . (int)$shipment['truck_owner_id'])->fetch();
                if ($truckOwnerUser) {
                    NotificationService::send('shipment_rejected', $truckOwnerUser, [
                        'shipment_id' => $shipmentId
                    ]);
                }
            }

            $stmt = db()->prepare(
                "UPDATE shipments 
                 SET status = 'posted', 
                     offer_price = NULL, 
                     offer_owner = NULL, 
                     truck_owner_id = NULL
                 WHERE id = :id"
            );
            $stmt->execute([':id' => $shipmentId]);

            set_flash('success', 'Offer rejected. Shipment is now open for new offers.');
            header('Location: ' . url_with_lang('shipment_detail.php', ['id' => $shipmentId]));
            exit;
        }
    } elseif ($action === 'upload_pod') {
        if (($isAdmin || ($isTruckOwner && $isAssignedTruckOwner)) && in_array($shipment['status'], ['confirmed', 'in_transit', 'delivered'])) {
            if (isset($_FILES['pod_file']) && $_FILES['pod_file']['error'] === UPLOAD_ERR_OK) {
                $fileTmpPath = $_FILES['pod_file']['tmp_name'];
                $fileName = $_FILES['pod_file']['name'];
                $fileSize = $_FILES['pod_file']['size'];
                $fileType = $_FILES['pod_file']['type'];
                $fileNameCmps = explode(".", $fileName);
                $fileExtension = strtolower(end($fileNameCmps));

                $allowedfileExtensions = ['jpg', 'jpeg', 'png', 'pdf'];
                if (in_array($fileExtension, $allowedfileExtensions)) {
                    $newFileName = 'pod_' . $shipmentId . '_' . md5(time() . $fileName) . '.' . $fileExtension;
                    $uploadFileDir = __DIR__ . '/uploads/pods/';
                    if (!is_dir($uploadFileDir)) {
                        mkdir($uploadFileDir, 0777, true);
                    }
                    $dest_path = $uploadFileDir . $newFileName;

                    if(move_uploaded_file($fileTmpPath, $dest_path)) {
                        $dbPath = 'uploads/pods/' . $newFileName;
                        $stmt = db()->prepare("UPDATE shipments SET pod_file = :pod_file, status = 'delivered' WHERE id = :id");
                        $stmt->execute([':pod_file' => $dbPath, ':id' => $shipmentId]);
                        
                        set_flash('success', 'Proof of Delivery uploaded successfully.');
                        header('Location: ' . url_with_lang('shipment_detail.php', ['id' => $shipmentId]));
                        exit; 
                    } else {
                        $errors[] = 'There was some error moving the file to upload directory.';
                    }
                } else {
                    $errors[] = 'Upload failed. Allowed file types: ' . implode(',', $allowedfileExtensions);
                }
            } else {
                $errors[] = 'No file uploaded or upload error.';
            }
        } else {
            $errors[] = 'You are not authorized to upload POD for this shipment.';
        }
    }
}

render_header(t('shipment_detail'));
?>

<?php if (!$shipment): ?>
    <div class="panel p-4">
        <p class="muted mb-0"><?= e(t('no_shipments')) ?></p>
        <div class="mt-3">
             <?php if ($isAdmin): ?>
                <a href="<?= e(url_with_lang('admin_shipments.php')) ?>" class="btn btn-outline-primary">Back to Shipments</a>
             <?php elseif ($isShipper): ?>
                <a href="<?= e(url_with_lang('shipper_dashboard.php')) ?>" class="btn btn-outline-primary">Back to Dashboard</a>
             <?php else: ?>
                <a href="<?= e(url_with_lang('index.php')) ?>" class="btn btn-outline-primary"><?= e(t('nav_home')) ?></a>
             <?php endif; ?>
        </div>
    </div>
<?php else: ?>
    <div class="row g-4">
        <div class="col-lg-7">
            <div class="panel p-4">
                <div class="d-flex justify-content-between align-items-start mb-3">
                    <div>
                        <h2 class="section-title mb-1"><?= e(t('shipment_detail')) ?> #<?= e($shipment['id']) ?></h2>
                        <p class="muted mb-0"><?= e(t('created_at')) ?>: <?= e($shipment['created_at']) ?></p>
                    </div>
                    <?php 
                        $statusBadgeClass = ($shipment['status'] === 'pending_approval') ? 'bg-warning text-dark' : $shipment['status'];
                    ?>
                    <span class="badge-status <?= e($statusBadgeClass) ?>"><?= e(status_label($shipment['status'])) ?></span>
                </div>
                <div class="row g-3">
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('shipper_company')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['shipper_company']) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('shipper_name')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['shipper_name']) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('origin')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['origin_city']) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('destination')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['destination_city']) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('shipment_type')) ?></div>
                        <div class="fw-semibold"><?= e(t('type_' . strtolower($shipment['shipment_type'] ?? 'dry'))) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('cargo')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['cargo_description']) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('weight')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['weight_tons']) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('pickup_date')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['pickup_date']) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('delivery_date')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['delivery_date']) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('payment_method')) ?></div>
                        <div class="fw-semibold"><?= e($shipment['payment_method'] === 'bank_transfer' ? t('payment_bank') : t('payment_thawani')) ?></div>
                    </div>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('best_offer')) ?></div>
                        <div class="fw-semibold"><?= $shipment['offer_price'] ? e($shipment['offer_price'] . ' / ' . ($shipment['offer_owner'] ?? '')) : e(t('no_offers')) ?></div>
                    </div>
                    
                    <?php if (!empty($shipment['target_price'])): ?>
                    <div class="col-md-6">
                        <div class="small text-muted"><?= e(t('target_price')) ?></div>
                        <div class="fw-semibold text-info">$<?= e($shipment['target_price']) ?></div>
                    </div>
                    <?php endif; ?>

                    <?php if ($shipment['payment_status'] === 'paid'): ?>
                        <div class="col-12">
                            <div class="alert alert-success d-flex align-items-center mb-0">
                                <i class="bi bi-check-circle-fill fs-4 me-2"></i>
                                <div>
                                    <strong>Payment Complete</strong><br>
                                    Total Paid: <?= format_currency((float)$shipment['total_price']) ?> (Includes <?= format_currency((float)$shipment['platform_fee']) ?> platform fee)
                                </div>
                            </div>
                        </div>
                    <?php endif; ?>
                </div>
                <div class="mt-4 d-flex gap-2">
                    <?php if ($isAdmin): ?>
                        <a class="btn btn-outline-dark" href="<?= e(url_with_lang('admin_shipments.php')) ?>">
                            <i class="bi bi-arrow-left me-2"></i>Back to Shipments
                        </a>
                        <a class="btn btn-primary" href="<?= e(url_with_lang('admin_shipment_edit.php', ['id' => $shipmentId])) ?>">
                            <i class="bi bi-pencil me-2"></i>Edit Shipment
                        </a>
                    <?php elseif ($isShipper): ?>
                        <a class="btn btn-outline-dark" href="<?= e(url_with_lang('shipper_dashboard.php')) ?>"><?= e(t('shipper_dashboard')) ?></a>
                    <?php else: ?>
                        <a class="btn btn-outline-dark" href="<?= e(url_with_lang('truck_owner_dashboard.php')) ?>"><?= e(t('nav_owner')) ?></a>
                    <?php endif; ?>
                </div>
            </div>
        </div>
        
        <!-- Right Column: Actions (Offer / Payment) -->
        <div class="col-lg-5">
            <?php if ($isShipper): ?>
                <!-- Shipper View -->
                <div class="panel p-4 h-100">
                    <h3 class="section-title">Accept Offer</h3>
                    <?php if ($flash): ?>
                        <div class="alert alert-success" data-auto-dismiss="true"><?= e($flash['message']) ?></div>
                    <?php endif; ?>

                    <?php if ($shipment['status'] === 'offered' && $shipment['offer_price'] > 0): ?>
                        <?php 
                            $offerPrice = (float)$shipment['offer_price'];
                            $fee = $offerPrice * $platformFeePercentage;
                            $total = $offerPrice + $fee;
                        ?>
                        <div class="card bg-light border-0 mb-4">
                            <div class="card-body">
                                <h5 class="card-title fw-bold mb-3">Payment Breakdown</h5>
                                <div class="d-flex justify-content-between mb-2">
                                    <span class="text-muted">Truck Offer</span>
                                    <span class="fw-medium"><?= format_currency($offerPrice) ?></span>
                                </div>
                                <div class="d-flex justify-content-between mb-3">
                                    <span class="text-muted">Platform Fee (<?= e($platformFeePercentage * 100) ?>%)</span>
                                    <span class="fw-medium"><?= format_currency($fee) ?></span>
                                </div>
                                <hr>
                                <div class="d-flex justify-content-between align-items-center">
                                    <span class="fw-bold fs-5">Total</span>
                                    <span class="fw-bold fs-4 text-primary"><?= format_currency($total) ?></span>
                                </div>
                            </div>
                        </div>

                        <div class="d-grid gap-2">
                             <form method="post"> <?= csrf_field() ?>
                                <input type="hidden" name="action" value="accept_offer">
                                <button class="btn btn-success w-100 py-3 fw-bold shadow-sm" type="submit">
                                    <i class="bi bi-credit-card-2-front me-2"></i>Accept & Pay Now
                                </button>
                            </form>
                            <form method="post" onsubmit="return confirm('Are you sure you want to reject this offer?');"> <?= csrf_field() ?>
                                <input type="hidden" name="action" value="reject_offer">
                                <button class="btn btn-outline-danger w-100 py-2 fw-bold" type="submit">
                                    <i class="bi bi-x-circle me-2"></i>Reject Offer
                                </button>
                            </form>
                        </div>
                        <p class="text-center text-muted small mt-3 mb-0">
                            <i class="bi bi-shield-lock me-1"></i> Secure payment via <?= e($shipment['payment_method'] === 'bank_transfer' ? 'Bank Transfer' : 'Thawani') ?>
                        </p>
                    <?php elseif ($shipment['status'] === 'posted'): ?>
                        <div class="text-center py-5">
                            <i class="bi bi-hourglass-split fs-1 text-muted mb-3 d-block"></i>
                            <p class="mb-0 text-muted">Waiting for truck owners to submit offers.</p>
                        </div>
                    <?php elseif ($shipment['status'] === 'pending_approval'): ?>
                        <div class="text-center py-5">
                            <i class="bi bi-clipboard-check fs-1 text-warning mb-3 d-block"></i>
                            <p class="mb-0 text-muted"><?= t('pending_approval_msg') ?></p>
                        </div>
                    <?php elseif ($shipment['status'] === 'confirmed' || $shipment['status'] === 'in_transit' || $shipment['status'] === 'delivered'): ?>
                         <div class="text-center py-5">
                            <i class="bi bi-check-circle-fill fs-1 text-success mb-3 d-block"></i>
                            <h4 class="h5">Offer Accepted</h4>
                            <p class="mb-0 text-muted">This shipment has been confirmed and paid for.</p>
                        </div>
                    <?php endif; ?>
                    
                    <!-- POD Display for Shipper -->
                    <?php if (!empty($shipment['pod_file'])): ?>
                    <div class="mt-4 pt-4 border-top">
                        <h4 class="h6 text-muted mb-3">Proof of Delivery</h4>
                        <div class="card">
                            <div class="card-body d-flex align-items-center">
                                <i class="bi bi-file-earmark-text fs-3 text-primary me-3"></i>
                                <div>
                                    <a href="<?= e($shipment['pod_file']) ?>" target="_blank" class="fw-bold text-decoration-none stretched-link">View Document</a>
                                    <div class="small text-muted">Uploaded by Truck Owner</div>
                                </div>
                            </div>
                        </div>
                    </div>
                    <?php endif; ?>

                </div>

            <?php else: ?>
                <!-- Truck Owner / Admin / Other View (Submit Offer & POD) -->
                <div class="panel p-4">
                    <h3 class="section-title"><?= e(t('submit_offer')) ?></h3>
                    <?php if ($flash): ?>
                        <div class="alert alert-success" data-auto-dismiss="true"><?= e($flash['message']) ?></div>
                    <?php endif; ?>
                    <?php if ($errors): ?>
                        <div class="alert alert-warning"><?= e(implode(' ', $errors)) ?></div>
                    <?php endif; ?>
                    
                    <?php if ($shipment['status'] === 'posted' || $shipment['status'] === 'offered'): ?>
                        <form method="post"> <?= csrf_field() ?>
                            <input type="hidden" name="action" value="submit_offer">
                            <div class="mb-3">
                                <label class="form-label"><?= e(t('offer_owner')) ?></label>
                                <input class="form-control" name="offer_owner" value="<?= e($shipment['offer_owner'] ?? '') ?>" required>
                            </div>
                            
                            <?php if ($pricingModel === 'fixed_price' && !empty($shipment['target_price'])): ?>
                                <div class="mb-3">
                                    <label class="form-label"><?= e(t('target_price')) ?></label>
                                    <div class="input-group">
                                        <span class="input-group-text">$</span>
                                        <input class="form-control bg-light" value="<?= e($shipment['target_price']) ?>" readonly>
                                        <input type="hidden" name="offer_price" value="<?= e($shipment['target_price']) ?>">
                                    </div>
                                    <div class="form-text text-success fw-bold"><i class="bi bi-check-circle me-1"></i> Fixed Price Offer</div>
                                </div>
                                <button class="btn btn-success w-100 fw-bold shadow-sm" type="submit">
                                    Accept Load ($<?= e($shipment['target_price']) ?>)
                                </button>
                            <?php else: ?>
                                <div class="mb-3">
                                    <label class="form-label"><?= e(t('offer_price')) ?></label>
                                    <input class="form-control" name="offer_price" type="number" step="0.01" min="0.1" value="<?= e($shipment['offer_price'] ?? '') ?>" required>
                                </div>
                                <button class="btn btn-primary w-100" type="submit"><?= e(t('submit_offer')) ?></button>
                            <?php endif; ?>
                        </form>
                    <?php else: ?>
                        <div class="alert alert-info">
                            This shipment is already confirmed/processed or pending approval.
                        </div>
                    <?php endif; ?>

                    <!-- Proof of Delivery Section -->
                    <?php if (in_array($shipment['status'], ['confirmed', 'in_transit', 'delivered'])): ?>
                    <div class="mt-5 pt-4 border-top">
                        <h4 class="section-title mb-3">Proof of Delivery</h4>
                        
                        <?php if (!empty($shipment['pod_file'])): ?>
                            <div class="card mb-3">
                                <div class="card-body d-flex align-items-center">
                                    <i class="bi bi-check-circle-fill fs-3 text-success me-3"></i>
                                    <div>
                                        <div class="fw-bold text-success">POD Uploaded</div>
                                        <a href="<?= e($shipment['pod_file']) ?>" target="_blank" class="small text-decoration-none">View Document</a>
                                    </div>
                                </div>
                            </div>
                        <?php endif; ?>

                        <?php if ($isAdmin || ($isTruckOwner && $isAssignedTruckOwner)): ?>
                            <form method="post" enctype="multipart/form-data"> <?= csrf_field() ?>
                                <input type="hidden" name="action" value="upload_pod">
                                <div class="mb-3">
                                    <label class="form-label small text-muted">Upload POD Document (Image/PDF)</label>
                                    <input type="file" name="pod_file" class="form-control" accept="image/*,.pdf" required>
                                </div>
                                <button type="submit" class="btn btn-dark w-100">
                                    <i class="bi bi-upload me-2"></i>Upload POD
                                </button>
                            </form>
                        <?php endif; ?>
                    </div>
                    <?php endif; ?>

                </div>
            <?php endif; ?>
        </div>
    </div>
<?php endif; ?>

<?php render_footer(); ?>