<?php

namespace App\Services\Customer;

use App\Models\Customer;
use App\Models\Invoice;
use App\Models\ModuleHostingAccount;
use App\Models\ModuleVmware;
use App\Models\Service;
use App\Services\ActivityLogger;
use App\Services\Order\ServiceOrderRecorder;
use Illuminate\Support\Facades\DB;

class CustomerServiceAssignment
{
    public function __construct(
        private readonly ServiceOrderRecorder $orderRecorder,
        private readonly ActivityLogger $activityLogger,
    ) {}

    public function attach(Service $service, Customer $customer): Service
    {
        abort_if($service->customer_id !== null, 422, 'Dịch vụ đang thuộc khách hàng khác, hãy gỡ trước khi gán.');

        DB::transaction(function () use ($service, $customer) {
            $service->fill(['customer_id' => $customer->id])->saveQuietly();
            $this->syncModuleOwner($service, $customer->id);
            $this->orderRecorder->ensureForService($service->refresh());
        });

        $this->activityLogger->log(
            event: 'attached',
            logName: 'Service',
            description: "{$this->activityLogger->getCauserName()} gán dịch vụ #{$service->id} cho khách hàng {$customer->fullname} ({$customer->email})",
            subject: $service,
            newValues: [...$this->customerValues($customer), ...$this->orderValues($service)],
        );

        return $service;
    }

    public function detach(Service $service): void
    {
        $customer = $service->customer;
        if (! $customer) {
            return;
        }

        $orderValues = $this->orderValues($service);
        $orderItemId = $service->order_item_id;

        $service->fill(['customer_id' => null, 'order_item_id' => null, 'invoice_id' => null])->saveQuietly();
        $this->syncModuleOwner($service, null);
        Invoice::where('service_id', $service->id)->delete();
        $this->orderRecorder->discardOrder($orderItemId);

        $this->activityLogger->log(
            event: 'detached',
            logName: 'Service',
            description: "{$this->activityLogger->getCauserName()} gỡ dịch vụ #{$service->id} khỏi khách hàng {$customer->fullname} ({$customer->email}), xoá đơn hàng/hoá đơn",
            subject: $service,
            oldValues: [...$this->customerValues($customer), ...$orderValues],
        );
    }

    private function syncModuleOwner(Service $service, ?int $customerId): void
    {
        if ($service->vm_id) {
            ModuleVmware::whereKey($service->vm_id)->update(['customer_id' => $customerId]);
        }

        ModuleHostingAccount::where('service_id', $service->id)->update(['customer_id' => $customerId]);
    }

    private function customerValues(Customer $customer): array
    {
        return array_filter([
            'customer_id' => $customer->id,
            'customer_uuid' => $customer->uuid,
            'customer_name' => $customer->fullname,
            'customer_email' => $customer->email,
        ], fn ($value) => $value !== null);
    }

    private function orderValues(Service $service): array
    {
        $order = $service->orderItem?->order;

        return array_filter([
            'order_id' => $order?->id,
            'order_num' => $order?->order_num,
        ], fn ($value) => $value !== null);
    }
}