<?php

namespace App\Http\Services;

use App\Models\ProductPricings;
use App\Repositories\Admin\Product\ProductRepositoryInterface;
use Illuminate\Support\Str;

class ProductService
{
    protected ProductRepositoryInterface $repository;

    public function __construct(
        ProductRepositoryInterface $repository
    ) {
        $this->repository = $repository;
    }

    public function store(array $data)
    {
        // Prepare product data
        $productData = $this->prepareData($data);

        // Create product
        $product = $this->repository->create($productData);

        // Sync OS versions if provided (for VPS)
        if (!empty($data['os_ids'])) {
            $product->osVersions()->sync($data['os_ids']);
        }

        // Sync Control Panels if provided (for Hosting)
        if (!empty($data['control_panel_ids'])) {
            $this->saveControlPanels($product, $data);
        }

        // Save pricing cycles if provided
        if (!empty($data['pricing'])) {
            $this->savePricings($product, $data['pricing'], $data['currency'] ?? 'USD');
        }

        return $product;
    }

    public function update(int $id, array $data)
    {
        // Prepare product data
        $productData = $this->prepareData($data, false);

        // Update product
        $result = $this->repository->update($id, $productData);

        // Get the product for relationships
        $product = $this->repository->find($id);

        // Sync OS versions if provided (for VPS)
        if (isset($data['os_ids'])) {
            $product->osVersions()->sync($data['os_ids']);
        }

        // Sync Control Panels if provided (for Hosting)
        if (isset($data['control_panel_ids'])) {
            $this->saveControlPanels($product, $data);
        }

        // Save pricing cycles if provided
        if (!empty($data['pricing'])) {
            $this->savePricings($product, $data['pricing'], $data['currency'] ?? 'USD');
        }

        return $result;
    }

    public function delete(int $id)
    {
        return $this->repository->delete($id);
    }

    /**
     * Save pricing cycles for product
     */
    private function savePricings($product, array $pricingData, string $currency): void
    {
        foreach ($pricingData as $cycle => $pricing) {
            // Only save if enabled and has price
            if (!empty($pricing['enabled']) && isset($pricing['price'])) {
                ProductPricings::updateOrCreate(
                    [
                        'product_id' => $product->id,
                        'billing_cycle' => $cycle,
                    ],
                    [
                        'price' => $pricing['price'] ?? 0,
                        'price_sale' => $pricing['price_sale'] ?? null,
                        'currency' => $currency,
                        'is_active' => true,
                    ]
                );
            } else {
                // Remove pricing if not enabled
                ProductPricings::where('product_id', $product->id)
                    ->where('billing_cycle', $cycle)
                    ->delete();
            }
        }
    }

    /**
     * Save Control Panels for product (for Hosting)
     */
    private function saveControlPanels($product, array $data): void
    {
        $syncData = [];

        foreach ($data['control_panel_ids'] as $panelId) {
            $priceModifier = $data['control_panel_price_modifiers'][$panelId] ?? 0;
            $isDefault = isset($data['control_panel_default']) && $data['control_panel_default'] == $panelId;

            $syncData[$panelId] = [
                'price_modifier' => $priceModifier,
                'is_default' => $isDefault,
            ];
        }

        $product->controlPanels()->sync($syncData);
    }

    /**
     * Prepare data for create/update
     */
    private function prepareData(array $data, bool $isCreate = true): array
    {
        $prepared = [];

        // Generate UUID and slug only on create
        if ($isCreate) {
            $prepared['uuid'] = (string) Str::uuid();
        }

        // Name and slug
        if (isset($data['name'])) {
            $prepared['name'] = $data['name'];
            $prepared['slug'] = Str::slug($data['name']);
        }

        // Direct mappable fields
        $fillableFields = [
            'short_description',
            'description',
            'setup_fee',
            'trial_days',
            'cpu',
            'ram',
            'gpu',
            'disk',
            'bandwidth',
            'stock',
            'is_unlimited',
            'is_active',
            'sort_order',
            'product_type',
            'product_categories_id',
            'published_at',
        ];

        foreach ($fillableFields as $field) {
            if (array_key_exists($field, $data)) {
                $prepared[$field] = $data[$field];
            }
        }

        return $prepared;
    }
}