<?php

namespace App\Services\Paddle;

use App\Models\PackageAddon;
use App\Services\Paddle\Exceptions\PaddleException;
use Illuminate\Support\Arr;

class PaddleAddonCatalogService
{
    public function __construct(private readonly PaddleClient $client) {}

    /**
     * @return array<string, mixed>
     */
    public function createProduct(PackageAddon $addon, array $overrides = []): array
    {
        $payload = $this->buildProductPayload($addon, $overrides);

        return $this->extractEntity($this->client->post('/products', $payload));
    }

    /**
     * @return array<string, mixed>
     */
    public function updateProduct(string $productId, PackageAddon $addon, array $overrides = []): array
    {
        $payload = $this->buildProductPayload($addon, $overrides);

        return $this->extractEntity($this->client->patch("/products/{$productId}", $payload));
    }

    /**
     * @return array<string, mixed>
     */
    public function createPrice(PackageAddon $addon, string $productId, array $overrides = []): array
    {
        $payload = $this->buildPricePayload($addon, $productId, $overrides);

        return $this->extractEntity($this->client->post('/prices', $payload));
    }

    /**
     * @return array<string, mixed>
     */
    public function updatePrice(string $priceId, PackageAddon $addon, array $overrides = []): array
    {
        $payload = $this->buildPricePayload($addon, $overrides['product_id'] ?? '', $overrides);

        return $this->extractEntity($this->client->patch("/prices/{$priceId}", $payload));
    }

    /**
     * @return array<string, mixed>
     */
    public function buildProductPayload(PackageAddon $addon, array $overrides = []): array
    {
        $payload = array_merge([
            'name' => $overrides['name'] ?? $addon->label,
            'description' => $overrides['description'] ?? sprintf('Fotospiel Add-on: %s', $addon->label),
            'tax_category' => $overrides['tax_category'] ?? 'standard',
            'type' => $overrides['type'] ?? 'standard',
            'custom_data' => array_merge([
                'addon_key' => $addon->key,
                'increments' => $addon->increments,
            ], $overrides['custom_data'] ?? []),
        ], Arr::except($overrides, ['tax_category', 'type', 'custom_data', 'name', 'description']));

        return $this->cleanPayload($payload);
    }

    /**
     * @return array<string, mixed>
     */
    public function buildPricePayload(PackageAddon $addon, string $productId, array $overrides = []): array
    {
        $unitPrice = $overrides['unit_price'] ?? $this->defaultUnitPrice($addon);

        $payload = array_merge([
            'product_id' => $productId,
            'description' => $overrides['description'] ?? $addon->label,
            'unit_price' => $unitPrice,
            'custom_data' => array_merge([
                'addon_key' => $addon->key,
            ], $overrides['custom_data'] ?? []),
        ], Arr::except($overrides, ['unit_price', 'description', 'custom_data', 'product_id']));

        return $this->cleanPayload($payload);
    }

    /**
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    protected function extractEntity(array $payload): array
    {
        return Arr::get($payload, 'data', $payload);
    }

    /**
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    protected function cleanPayload(array $payload): array
    {
        $filtered = collect($payload)
            ->reject(static fn ($value) => $value === null || $value === '' || $value === [])
            ->all();

        if (array_key_exists('custom_data', $filtered)) {
            $filtered['custom_data'] = collect($filtered['custom_data'])
                ->reject(static fn ($value) => $value === null || $value === '' || $value === [])
                ->all();
        }

        return $filtered;
    }

    /**
     * @return array<string, string>
     */
    protected function defaultUnitPrice(PackageAddon $addon): array
    {
        $metaPrice = $addon->metadata['price_eur'] ?? null;

        if (! is_numeric($metaPrice)) {
            throw new PaddleException('No unit price specified for addon. Provide metadata[price_eur] or overrides.unit_price.');
        }

        $amountCents = (int) round(((float) $metaPrice) * 100);

        return [
            'amount' => (string) $amountCents,
            'currency_code' => 'EUR',
        ];
    }
}