<?php

namespace App\Products\ProductGroup;

use App\Products\AbstractProductable;
use App\Products\ProductableEnum;
use App\Properties\Models\PropertizableTrait;
use App\Properties\Models\PropertyKey;
use Komma\KMS\Documents\DocumentsTrait;
use Komma\KMS\Documents\Kms\DocumentableInterface;
use App\Categories\Kms\CategorizableInterface;
use App\Products\Product\Product;
use App\Products\ProductComposite\ProductComposite;
use App\Products\ProductGroupBehaviour\ProductGroupBehaviour;
use App\Properties\Models\PropertizableInterface;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Laravel\Scout\Searchable;

/**
 * App\Products\ProductGroup\ProductGroup
 *
 * @property int $id
 * @property int $active
 * @property int $group_products
 * @property int $display_as
 * @property int $product_group_behaviour_id
 * @property \Illuminate\Support\Carbon|null $created_at
 * @property \Illuminate\Support\Carbon|null $updated_at
 * @property-read \Illuminate\Database\Eloquent\Collection|\App\Categories\Models\Category[] $categories
 * @property-read int|null $categories_count
 * @property-read \Illuminate\Database\Eloquent\Collection|ProductComposite[] $composites
 * @property-read int|null $composites_count
 * @property-read \Illuminate\Database\Eloquent\Collection|\Komma\KMS\Documents\Models\Document[] $documents
 * @property-read int|null $documents_count
 * @property-read \Illuminate\Database\Eloquent\Collection|PropertyKey[] $filterPropertyKeys
 * @property-read int|null $filter_property_keys_count
 * @property-read string $vat_scenario_enum
 * @property-read \Illuminate\Database\Eloquent\Collection|\Komma\KMS\Documents\Models\Document[] $images
 * @property-read int|null $images_count
 * @property-read ProductGroupBehaviour $productGroupBehaviour
 * @property-read \Illuminate\Database\Eloquent\Collection|Product[] $products
 * @property-read int|null $products_count
 * @property-read \Illuminate\Database\Eloquent\Collection|\App\Properties\Models\Property[] $properties
 * @property-read int|null $properties_count
 * @property-read \Illuminate\Database\Eloquent\Collection|\Komma\KMS\Sites\Models\Site[] $sites
 * @property-read int|null $sites_count
 * @property-read \App\Products\ProductGroup\ProductGroupTranslation|null $translation
 * @property-read \Illuminate\Database\Eloquent\Collection|\App\Products\ProductGroup\ProductGroupTranslation[] $translations
 * @property-read int|null $translations_count
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup newModelQuery()
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup newQuery()
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup query()
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup whereActive($value)
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup whereCreatedAt($value)
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup whereDisplayAs($value)
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup whereGroupProducts($value)
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup whereId($value)
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup whereProductGroupBehaviourId($value)
 * @method static \Illuminate\Database\Eloquent\Builder|ProductGroup whereUpdatedAt($value)
 * @mixin \Eloquent
 */
class ProductGroup extends AbstractProductable implements CategorizableInterface, DocumentableInterface, PropertizableInterface
{
    use Searchable;
    use DocumentsTrait;
    use PropertizableTrait;

    public function searchableAs()
    {
        return 'products_groups_index';
    }

    public function toSearchableArray()
    {
        return [
            'id' => $this->id,
            'name' => $this->name,
        ];
    }

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = ['name', 'active', 'product_group_behaviour_id'];

    public function productGroupBehaviour()
    {
        return $this->belongsTo(ProductGroupBehaviour::class);
    }

    public function products()
    {
        return $this->belongsToMany(Product::class)->withPivot('sort_order');
    }

    public function composites()
    {
        return $this->belongsToMany(ProductComposite::class);
    }

    public function translations(): HasMany
    {
        return $this->hasMany(ProductGroupTranslation::class);
    }

    public function filterPropertyKeys(): BelongsToMany {
        return $this->belongsToMany(PropertyKey::class,'product_group_property_keys')->withPivot('sort_order');
    }

    /**
     * Returns the lowest price possible for the group.
     * Also known as "entry price"
     *
     * @return float
     */
    public function getPrice(): float
    {
        /** @var ProductGroupBehaviour $behaviour */
        $behaviour = $this->productGroupBehaviour()->first();

        $price = 0;
        switch ($behaviour->name)
        {
            case 'and':
                $products = $this->products()->where('active', '=', '1')->get(['products.id', 'products.price']);
                $products->each(function(Product $product) use (&$price) {
                    $price += $product->price;
                });
                break;
            case 'or':
            case 'xor':
                /** @var Product $product */
                $product = $this->products()->where('active', '=', '1')->orderBy('products.price', 'asc')->first(['products.id', 'products.price']);
                if($product) $price += $product->getPrice();
                break;
            default:
                throw new \RuntimeException("The productgroup cannot handle behaviour '".$behaviour->title."' because it was not implemented");
        }

        return $price;
    }

    /**
     * @return string
     */
    public function getVatScenarioEnumAttribute(): string
    {
        return config('shop.vat.default_scenario');
    }

    /**
     * @return int
     */
    public function enum(): int
    {
        return ProductableEnum::PRODUCT_GROUP;
    }
}