<?php


namespace App\Komma\Shop\ShipmentGroups;

use App\Komma\Kms\Core\Sections\SectionService;
use App\Komma\Shop\Shipments\Shipment;
use App\Komma\Shop\Shipments\ShipmentService;
use App\Komma\Shop\Shipments\ShipmentStatus;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Collection;

class ShipmentGroupService extends SectionService
{
    protected $forModelName = ShipmentGroup::class;

    /**
     * Makes a shipmentGroup using
     *
     * @param Shipment $shipment
     * @return ShipmentGroup
     */
    public function createForShipment(Shipment $shipment): ShipmentGroup
    {
        return $this->createForShipments(collect([$shipment]));
    }

    /**
     * Give this method an array, collection or any other iterable that contains Shipments, and it will
     * return you a ShipmentGroup for those shipments. Shipments that are already a part of a shipmentGroup wil be ignored.
     * If all the shipments are assigned to another ShipmentGroup, it will return null instead of a ShipmentGroup.
     *
     * @param Collection $shipments
     * @return ShipmentGroup|null
     */
    public function createForShipments(Collection $shipments): ? ShipmentGroup {
        if(!ShipmentService::iterableContainsShipments($shipments)) throw new \InvalidArgumentException('The iterable does not exclusively contain shipments.');

        //Filter out the shipments that already belong to a shipmentGroup
        $shipments = $shipments->filter(function(Shipment $shipment) {
            return (!$shipment->shipmentGroup_id);
        });
        if($shipments->count() == 0) return null;

        $shipmentGroup = new ShipmentGroup();
        $shipmentGroup->status = ShipmentGroupStatus::PENDING;
        $shipmentGroup->save();
        $shipmentGroup->shipments()->saveMany($shipments);

        return $shipmentGroup;
    }

    /**
     * Updates all shipments in a group to a certain status
     *
     * @param ShipmentGroup $shipmentGroup
     * @param string $status
     * @return ShipmentGroup
     */
    public function updateShipmentStatusesTo(ShipmentGroup $shipmentGroup, $status)
    {
        if(!ShipmentStatus::isValidItem($status)) throw new \InvalidArgumentException('The status of "'.$status.'" is not a valid status');
        $shipmentGroup->shipments()->update(['status' => $status]);
        return $shipmentGroup;
    }

    /**
     * Return a query builder to retrieve shipment groups by a certain status.
     *
     * @param string $status
     * @return mixed
     */
    public function shipmentGroupsByStatus(string $status)
    {
        if (!ShipmentGroupStatus::isValidItem($status)) {
            throw new \InvalidArgumentException('The shipment group status "' . $status . '" is invalid.');
        }
        return $this->forModelName::where('status', '=', $status);
    }

    /**
     * Returns the latest x shipment groups. Where x is a random number.
     *
     * @param $int
     * @return Builder
     */
    public function getLatest($int): Builder
    {
        /** @var Builder $ordersQueryBuilder */
        $ordersQueryBuilder = $this->forModelName::query();
        return $ordersQueryBuilder->latest('created_at')->limit($int);
    }

    /**
     * @param Collection $shipments
     */
    public function removeShipmentsFromGroup(Collection $shipments)
    {
        $shipmentIds = $shipments->pluck('id');
        if(!ShipmentService::iterableContainsShipments($shipments)) throw new \InvalidArgumentException('The iterable does not exclusively contain shipments.');
        Shipment::whereIn('id', $shipmentIds)->update(['shipment_group_id' => NULL]);
    }

    /**
     * Remove the shipment group from a shipment
     * @param Shipment $shipment
     */
    public function removeShipmentFromGroup(Shipment $shipment)
    {
        $shipment->shipmentGroup()->dissociate();
        $shipment->save();
    }

    /**
     * @param ShipmentGroup $shipmentGroup
     * @param Collection $shipments
     */
    public function addShipmentsToGroup(ShipmentGroup $shipmentGroup, Collection $shipments)
    {
        if(!ShipmentService::iterableContainsShipments($shipments)) throw new \InvalidArgumentException('The iterable does not exclusively contain shipments.');
        $shipments->each(function(Shipment $shipment) use($shipmentGroup) {
            if($shipment->shipment_group_id) return; //continue to the next iteration
            $shipment->shipmentGroup()->associate($shipmentGroup);
            $shipment->save();
        });
    }

    /**
     * Ship the shipmentgroup. Marking it as shipped.
     *
     * @param ShipmentGroup $shipmentGroup
     * @return ShipmentGroup
     */
    public function ship(ShipmentGroup $shipmentGroup)
    {
        $this->updateShipmentStatusesTo($shipmentGroup, ShipmentStatus::IN_TRANSIT);
        $shipmentGroup->status = ShipmentGroupStatus::SHIPPED;
        $shipmentGroup->save();
        return $shipmentGroup;
    }


    /**
     * Retrieves an array where the key names are field names, and value are the search values.
     * And uses that array to search for orders. The found orders are returned as a QueryBuilder
     * that holds the query to return all the found orders.
     *
     * @param array $input $input
     * @return Builder
     */
    public function search(array $input): Builder
    {
        /** @var Builder $ordersQueryBuilder */
        $ordersQueryBuilder = $this->forModelName::query();

        foreach ($input as $fieldName => $searchValue) {
            if ($searchValue == '') {
                continue;
            }
            switch ($fieldName) {
                case 'id':
                    $ordersQueryBuilder->where('id', '=', $searchValue);
                    break;
            }
        }

        return $ordersQueryBuilder;
    }
}