<?php

namespace App\Services\Machine;

use App\Models\Machine\Machine;
use App\Models\Machine\MachineLog;
use Illuminate\Support\Facades\DB;
use Carbon\Carbon;

class MachineService
{
    /**
     * Update machine heartbeat and status.
     * 
     * @param string $serialNo
     * @param array $data
     * @return Machine
     */
    public function updateHeartbeat(string $serialNo, array $data): Machine
    {
        return DB::transaction(function () use ($serialNo, $data) {
            $machine = Machine::where('serial_no', $serialNo)->firstOrFail();

            $updateData = [
                'status' => 'online',
                'temperature' => $data['temperature'] ?? $machine->temperature,
                'current_page' => $data['current_page'] ?? $machine->current_page,
                'door_status' => $data['door_status'] ?? $machine->door_status,
                'firmware_version' => $data['firmware_version'] ?? $machine->firmware_version,
                'last_heartbeat_at' => now(),
            ];

            $machine->update($updateData);

            // Record log if provided
            if (!empty($data['log'])) {
                $machine->logs()->create([
                    'level' => $data['log_level'] ?? 'info',
                    'message' => $data['log'],
                    'payload' => $data['log_payload'] ?? null,
                ]);
            }

            return $machine;
        });
    }

    /**
     * Update machine slot stock.
     */
    public function updateSlotStock(Machine $machine, int $slotNo, int $stock): void
    {
        $machine->slots()->where('slot_no', $slotNo)->update([
            'stock' => $stock,
            'last_restocked_at' => now(),
        ]);
    }

    /**
     * Legacy support for recordLog (Existing code).
     */
    public function recordLog(int $machineId, array $data): MachineLog
    {
        $machine = Machine::findOrFail($machineId);

        return $machine->logs()->create([
            'level' => $data['level'] ?? 'info',
            'message' => $data['message'],
            'payload' => $data['context'] ?? null,
        ]);
    }
}