<?php

namespace Webkul\BagistoApi\Models;

use ApiPlatform\Metadata\ApiProperty;
use ApiPlatform\Metadata\ApiResource;
use ApiPlatform\Metadata\GraphQl\Query;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Longyi\Core\Models\ProductVariant as BaseProductVariant;
use Spatie\MediaLibrary\MediaCollections\Models\Media;
use Webkul\BagistoApi\Resolver\BaseQueryItemResolver;

/**
 * BagistoApi wrapper around the Longyi1 flexible variant model so that
 * ApiPlatform can expose variants (and their images) as part of the
 * single product query.
 */
#[ApiResource(
    routePrefix: '/api/shop',
    shortName: 'ProductVariant',
    operations: [],
    graphQlOperations: [
        new Query(resolver: BaseQueryItemResolver::class),
    ]
)]
class ProductVariant extends BaseProductVariant
{
   
    protected $appends = [
        'effective_price',
        'variant_images',
        'option_values',
    ];

    #[ApiProperty(identifier: true, writable: false)]
    public function getId(): ?int
    {
        return $this->id;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getProduct_id(): ?int
    {
        return $this->product_id;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getSku(): ?string
    {
        return $this->sku;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getName(): ?string
    {
        return $this->name;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getPrice(): ?float
    {
        return $this->price !== null ? (float) $this->price : null;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getCompare_price(): ?float
    {
        return $this->compare_price !== null ? (float) $this->compare_price : null;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getSpecial_price(): ?float
    {
        return $this->special_price !== null ? (float) $this->special_price : null;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getSpecial_price_from(): ?string
    {
        return $this->special_price_from ? $this->special_price_from->toDateString() : null;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getSpecial_price_to(): ?string
    {
        return $this->special_price_to ? $this->special_price_to->toDateString() : null;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getCost(): ?float
    {
        return $this->cost !== null ? (float) $this->cost : null;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getWeight(): ?float
    {
        return $this->weight !== null ? (float) $this->weight : null;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getQuantity(): ?int
    {
        return $this->quantity !== null ? (int) $this->quantity : null;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getStatus(): ?bool
    {
        return (bool) $this->status;
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getSort_order(): ?int
    {
        return $this->sort_order !== null ? (int) $this->sort_order : null;
    }

    /**
     * Effective price considering variant-level special_price window.
     */
    public function getEffectivePriceAttribute(): float
    {
        return $this->getBasicEffectivePrice();
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getEffective_price(): ?float
    {
        return $this->getEffectivePriceAttribute();
    }

    #[ApiProperty(writable: false, readable: true, required: false)]
    public function getIs_saleable(): bool
    {
        return $this->isSaleable();
    }

    /**
     * Variant images stored in the Spatie media table via product_variant_images pivot.
     */
    public function variant_images(): BelongsToMany
    {
        return $this->belongsToMany(
            Media::class,
            'product_variant_images',
            'product_variant_id',
            'media_id'
        )->withPivot('position')
         ->orderByPivot('position');
    }

    /**
     * Serialize variant images inline as a JSON string to avoid IRI generation
     * (Spatie Media is not an ApiResource).
     *
     * Must be named getVariantImagesAttribute so that ApiPlatform's
     * EloquentPropertyNameCollectionMetadataFactory picks it up as a virtual
     * attribute (snake_cased: 'variant_images', camelCase in GraphQL:
     * 'variantImages').
     *
     * Returns: '[{"id":1,"url":"https://...","position":0}, ...]' or null.
     */
    public function getVariantImagesAttribute(): ?string
    {
        if (! $this->relationLoaded('variant_images')) {
            $this->load('variant_images');
        }

        $payload = ($this->getRelation('variant_images') ?? collect())
            ->map(fn (Media $m) => [
                'id'       => $m->id,
                'url'      => $m->getUrl(),
                'position' => $m->pivot->position ?? 0,
            ])
            ->values()
            ->all();

        return empty($payload) ? null : json_encode($payload);
    }

    /**
     * Option values attached to the variant (e.g. Red + Small).
     */
    public function values(): BelongsToMany
    {
        return $this->belongsToMany(
            \Longyi\Core\Models\ProductOptionValue::class,
            'product_variant_option_values',
            'product_variant_id',
            'product_option_value_id'
        )->withTimestamps();
    }

    /**
     * Serialize option values inline as a JSON string to avoid registering a
     * separate ApiResource for ProductOptionValue.
     *
     * Named getOptionValuesAttribute so ApiPlatform picks it up as a virtual
     * attribute: snake_cased 'option_values', GraphQL field 'optionValues'.
     *
     * Returns: '[{"id":1,"label":"Red","code":"red","option_id":5,"option_code":"color"}, ...]' or null.
     */
    public function getOptionValuesAttribute(): ?string
    {
        if (! $this->relationLoaded('values')) {
            $this->load('values.option');
        }

        $payload = ($this->getRelation('values') ?? collect())
            ->map(fn ($value) => [
                'id'          => $value->id,
                'label'       => $value->label,
                'code'        => $value->code,
                'option_id'   => $value->product_option_id,
                'option_code' => $value->option?->code,
            ])
            ->values()
            ->all();

        return empty($payload) ? null : json_encode($payload);
    }

    public function product(): BelongsTo
    {
        return $this->belongsTo(Product::class, 'product_id');
    }
}