<?php

namespace App\Services;

use App\Models\ClassPackage;
use App\Models\Unit;
use Illuminate\Database\Eloquent\Collection;

class ClassPackageService
{
    public function __construct(
        protected ClassPackageUnitService $unitService,
    ) {}

    public function getAll(): Collection
    {
        return ClassPackage::with('products')->orderBy('created_at', 'desc')->get();
    }

    public function findById(int $id): ?ClassPackage
    {
        return ClassPackage::with('products')->find($id);
    }

    public function create(array $data): ClassPackage
    {
        $materials = $data['materials'] ?? [];
        unset($data['materials']);

        $data['contract_material_value'] = $this->calcMaterialValue($materials);

        $package = ClassPackage::create($data);

        $this->syncMaterials($package, $materials);

        $this->replicateToAllUnits($package->load('products'));

        return $package->load('products');
    }

    public function update(int $id, array $data): ?ClassPackage
    {
        $package = $this->findById($id);
        if (!$package) return null;

        $materials = $data['materials'] ?? null;
        unset($data['materials']);

        if ($materials !== null) {
            $data['contract_material_value'] = $this->calcMaterialValue($materials);
        }

        $package->update($data);

        if ($materials !== null) {
            $this->syncMaterials($package, $materials);
        }

        return $package->fresh('products');
    }

    public function delete(int $id): bool
    {
        $package = ClassPackage::find($id);
        if (!$package) return false;

        return $package->delete();
    }

    public function replicateToAllUnits(ClassPackage $package): void
    {
        Unit::all()->each(function (Unit $unit) use ($package) {
            $this->unitService->replicateFromBasePackage($unit->id, $package);
        });
    }

    private function syncMaterials(ClassPackage $package, array $materials): void
    {
        $syncData = [];
        foreach ($materials as $m) {
            $syncData[$m['product_id']] = [
                'quantity' => $m['quantity'],
                'price'    => $m['price'],
            ];
        }
        $package->products()->sync($syncData);
    }

    private function calcMaterialValue(array $materials): float
    {
        return array_reduce($materials, fn($carry, $m) => $carry + ($m['quantity'] * $m['price']), 0.0);
    }
}