<?php

declare(strict_types=1);

namespace App\Support;

use App\Models\Artwork;

final class ArtworkFeaturedImagePath
{
    /**
     * @return array<string, array<string, int|string>>
     */
    public function variants(): array
    {
        /** @var array<string, array<string, int|string>> $variants */
        $variants = config('uploads.featured_variants', []);

        return $variants;
    }

    /**
     * @return list<string>
     */
    public function variantNames(): array
    {
        return array_keys($this->variants());
    }

    public function defaultVariant(): string
    {
        return 'desktop';
    }

    public function featuredPrefix(): string
    {
        return trim((string) config('uploads.featured_prefix', 'artworks/featured'), '/');
    }

    public function objectPath(Artwork $artwork, string $variant): string
    {
        $hash = $this->normalizedHash($artwork);
        $variantName = $this->normalizeVariant($variant);

        return sprintf(
            '%s/%s/%s/%s/%s.webp',
            $this->featuredPrefix(),
            $variantName,
            substr($hash, 0, 2),
            substr($hash, 2, 2),
            $hash,
        );
    }

    public function url(Artwork $artwork, string $variant): string
    {
        return rtrim((string) config('cdn.files_url', 'https://files.skinbase.org'), '/').'/'.$this->objectPath($artwork, $variant);
    }

    /**
     * @return list<string>
     */
    public function preferredVariantOrder(string $variant): array
    {
        $variantName = $this->normalizeVariant($variant);

        $orders = [
            'xs' => ['xs', 'mobile_sm', 'mobile', 'tablet', 'desktop', 'desktop_xl'],
            'mobile_sm' => ['mobile_sm', 'mobile', 'tablet', 'desktop', 'desktop_xl'],
            'mobile' => ['mobile', 'mobile_sm', 'xs', 'tablet', 'desktop', 'desktop_xl'],
            'tablet' => ['tablet', 'desktop', 'desktop_xl', 'mobile', 'mobile_sm', 'xs'],
            'desktop' => ['desktop', 'desktop_xl', 'tablet', 'mobile', 'mobile_sm', 'xs'],
            'desktop_xl' => ['desktop_xl', 'desktop', 'tablet', 'mobile', 'mobile_sm', 'xs'],
        ];

        return $orders[$variantName] ?? [$this->defaultVariant()];
    }

    /**
     * @return array<string, int|string>|null
     */
    public function variantConfig(string $variant): ?array
    {
        return $this->variants()[$this->normalizeVariant($variant)] ?? null;
    }

    public function normalizeVariant(string $variant): string
    {
        return array_key_exists($variant, $this->variants()) ? $variant : $this->defaultVariant();
    }

    private function normalizedHash(Artwork $artwork): string
    {
        $hash = trim((string) $artwork->hash);

        if ($hash === '') {
            throw new \InvalidArgumentException('Artwork hash is required for featured thumbnail paths.');
        }

        return $hash;
    }
}