<?php

namespace Modules\Core\Shipping\Extensions;

use Filament\Actions\Action;
use Filament\Forms\Components\Repeater;
use Filament\Forms\Components\Select;
use Filament\Forms\Components\TextInput;
use Filament\Notifications\Notification;
use Lunar\Admin\Support\Extending\ViewPageExtension;
use Lunar\Models\Order;
use Modules\Core\Order\DTOs\OrderFulfillmentResult;
use Modules\Core\Order\Services\OrderFulfillmentService;
use Modules\Core\Order\Services\OrderStatusFlow;
use Modules\Core\Shipping\DTOs\ShipmentRequest;
use Modules\Core\Shipping\Support\WeightCalculator;

/**
 * Filament wiring only (labels, icons, visibility, form schema) for the
 * staff-facing status workflow — every guard check, status write, and
 * event dispatch lives in Modules\Core\Order\Services\
 * OrderFulfillmentService/OrderStatusFlow, resolved via app() (a
 * ViewPageExtension is instantiated by Lunar's own extension mechanism,
 * not the container, so there's no constructor-injection seam here).
 *
 * Strips Lunar's own "Update Status" header action (registered by vendor
 * ManageOrder as Action::make('update_status')) and replaces it with our
 * own action of the same name — vendor's writes $record->status directly
 * with no audit trail, no branch validation, and no side effects. Our
 * replacement offers every status in the order's own branch (carrier or
 * pickup — see OrderStatusFlow::allOptions()), not just the guided next
 * step, so staff can freely revert to an earlier status too. It is a
 * PLAIN status write — picking 'dispatched' here does not create a real
 * shipment (see "Create Shipment" below for that).
 *
 * "Create Shipment" is its own separate header action, visible only for a
 * carrier order sitting at 'ready_for_dispatch' — this is the one action
 * that talks to a real carrier API and writes Order::status to
 * 'dispatched' as a side effect of that succeeding, so it needs its own
 * weight/locker inputs specific to that one real-world action, not
 * bundled into the general-purpose status select where they'd appear for
 * every revert/manual-override use of 'dispatched' too. The form branches
 * on which carrier the order actually uses
 * (OrderFulfillmentService::carrierFor()): a weight-billed carrier (ACS)
 * gets a single TOTAL weight field for the whole shipment (ACS has no
 * per-package weight concept — one Weight value is sent alongside
 * Item_Quantity in the same ACS_Create_Voucher call, see
 * AcsFulfillmentService::createShipment()), pre-filled from the order's
 * own line weights (Modules\Core\Shipping\Support\WeightCalculator) but
 * still staff-editable, plus a package count (ShipmentRequest::
 * $packageCount) — more than 1 issues a main voucher plus a
 * multi-part sub-voucher per extra package (persistMultipartVouchers()),
 * each recorded as its own Shipment row sharing the same total weight in
 * meta. Box Now, which bills by compartment size rather than
 * weight, gets a repeatable list of boxes (one row per physical parcel,
 * each with its own S/M/L size) instead — see
 * Modules\Core\Shipping\Carriers\BoxNow\BoxNowFulfillmentService for how
 * multiple boxes become multiple Shipment rows from one delivery request.
 * Box Now's locker is locked to read-only once the shopper's own checkout
 * selection ($order->shippingAddress->meta['box_now_locker']) is present
 * — staff can only fill it in manually for the (current, checkout-UI-less)
 * case where nothing set it yet.
 *
 * "Mark Paid" is a third, separate header action — Order::paid is
 * independent of `status` (see OrderStatusFlow's own docblock), so it
 * doesn't belong bundled into the status select either. Visible only when
 * the order's payment method doesn't auto-capture at checkout (currently
 * only cash-on-delivery — see OrderStatusFlow::canMarkPaid()); a
 * processor-managed method (Stripe) or an immediate-capture offline
 * method (cash-in-hand, bank-transfer) sets Order::paid automatically via
 * Modules\Core\Order\Listeners\ApplyResolvedPaymentStatus, so this button
 * never appears for those.
 *
 * Also strips Lunar's own "Download PDF" header action (getDefaultHeaderActions()
 * in vendor ManageOrder) — its lunarpanel::pdf.order template does not meet
 * Greek AADE e-invoicing requirements, so it must not be offered as a
 * downloadable document until a compliant invoice generator exists.
 */
class OrderViewExtension extends ViewPageExtension
{
    public function headerActions(array $actions): array
    {
        $actions = array_filter($actions, fn ($action) => method_exists($action, 'getName')
            ? ! in_array($action->getName(), ['download_pdf', 'update_status'], true)
            : true);

        $actions[] = $this->createShipmentAction();
        $actions[] = $this->updateStatusAction();
        $actions[] = $this->markPaidAction();

        return $actions;
    }

    private function createShipmentAction(): Action
    {
        return Action::make('create_shipment')
            ->label('Create Shipment')
            ->icon('heroicon-o-truck')
            ->modalSubmitActionLabel('Create Shipment')
            ->schema(function (Order $record) {
                $isBoxNow = $this->service()->carrierFor($record) === 'box-now';
                $lockerId = $record->shippingAddress?->meta['box_now_locker']['locationId'] ?? null;

                if (! $isBoxNow) {
                    return [
                        TextInput::make('weight')
                            ->label('Total weight (kg)')
                            ->numeric()
                            ->minValue(0)
                            ->default(fn () => round(WeightCalculator::totalKg($record->lines), 2) ?: null)
                            ->helperText("Calculated from the order's line weights — adjust if needed, or leave blank to use the carrier's default. One figure for the whole shipment, not per package."),
                        TextInput::make('package_count')
                            ->label('Number of packages')
                            ->numeric()
                            ->integer()
                            ->minValue(1)
                            ->default(1)
                            ->required()
                            ->helperText('More than 1 issues a main voucher plus a sub-voucher per extra package, all sharing the total weight above.'),
                    ];
                }

                return [
                    TextInput::make('destination_location_id')
                        ->label('Box Now locker ID')
                        ->default($lockerId)
                        // Locked once the shopper's own checkout selection is
                        // known — staff should not be able to redirect a
                        // parcel to a different locker than the one the
                        // customer picked. Only editable for the (current,
                        // checkout-UI-less) case where nothing set it yet.
                        ->disabled(filled($lockerId))
                        ->dehydrated()
                        ->required()
                        ->helperText($lockerId
                            ? 'Set by the customer at checkout.'
                            : 'No locker was selected at checkout — enter it manually.'),
                    Repeater::make('boxes')
                        ->label('Boxes')
                        ->schema([
                            Select::make('size')
                                ->label('Size')
                                ->options(['S' => 'Small', 'M' => 'Medium', 'L' => 'Large'])
                                ->default('S')
                                ->native(false)
                                ->required(),
                        ])
                        ->defaultItems(1)
                        ->addActionLabel('Add another box')
                        ->minItems(1)
                        ->helperText('One row per physical parcel — Box Now ships by compartment size, not weight.'),
                ];
            })
            ->action(function (Order $record, array $data, Action $action) {
                $result = $this->service()->createShipmentAndDispatch(
                    $record,
                    new ShipmentRequest(
                        weight: filled($data['weight'] ?? null) ? (float) $data['weight'] : null,
                        packageCount: (int) ($data['package_count'] ?? 1),
                        destinationLocationId: $data['destination_location_id'] ?? null,
                        boxes: collect($data['boxes'] ?? [])->pluck('size')->all(),
                    ),
                );

                $this->notify($result);

                if (! $result->success) {
                    $action->halt();
                }
            })
            ->visible(fn (Order $record) => $this->service()->canCreateShipment($record));
    }

    private function updateStatusAction(): Action
    {
        return Action::make('update_status')
            ->label('Update Status')
            ->icon('heroicon-o-adjustments-horizontal')
            ->schema(fn (Order $record) => [
                Select::make('to_status')
                    ->label('New status')
                    ->options(app(OrderStatusFlow::class)->allOptions($record))
                    ->default($record->status)
                    ->native(false)
                    ->required(),
            ])
            ->action(function (Order $record, array $data, Action $action) {
                $to = $data['to_status'];
                $service = $this->service();

                $result = match (true) {
                    ($to === 'ready_for_dispatch' || $to === 'ready_for_pickup') && $record->status === 'processing' => $service->markReady($record),
                    $to === 'picked_up' && $record->status === 'ready_for_pickup' => $service->markPickedUp($record),
                    default => $service->transitionTo($record, $to),
                };

                $this->notify($result);

                if (! $result->success) {
                    $action->halt();
                }
            });
    }

    private function markPaidAction(): Action
    {
        return Action::make('mark_paid')
            ->label('Mark Paid')
            ->icon('heroicon-o-banknotes')
            ->color('success')
            ->requiresConfirmation()
            ->modalDescription('Confirms payment for this order has been received outside the system.')
            ->visible(fn (Order $record) => app(OrderStatusFlow::class)->canMarkPaid($record))
            ->action(fn (Order $record) => $this->notify($this->service()->markPaid($record)));
    }

    private function service(): OrderFulfillmentService
    {
        return app(OrderFulfillmentService::class);
    }

    private function notify(OrderFulfillmentResult $result): void
    {
        Notification::make()
            ->title($result->message)
            ->color($result->success ? 'success' : 'danger')
            ->send();
    }
}