<?php

namespace App\Services;

use App\Models\CashRegister;
use App\Models\Sale;
use Illuminate\Support\Facades\DB;

class CashRegisterService
{
    /**
     * Abrir caja
     */
    public function openRegister(array $data)
    {
        // Verificar que el usuario no tenga una caja abierta
        $openRegister = CashRegister::where('user_id', $data['user_id'])
            ->where('status', 'open')
            ->first();

        if ($openRegister) {
            throw new \Exception('Ya tienes una caja abierta. Debes cerrarla antes de abrir una nueva.');
        }

        return CashRegister::create([
            'user_id' => $data['user_id'],
            'opened_at' => now(),
            'initial_cash' => $data['initial_cash'] ?? 0,
            'status' => 'open',
        ]);
    }

    /**
     * Cerrar caja
     */
    public function closeRegister(CashRegister $register, array $data)
    {
        if ($register->status === 'closed') {
            throw new \Exception('Esta caja ya está cerrada.');
        }

        return DB::transaction(function () use ($register, $data) {
            // Calcular ventas en efectivo
            $cashSales = Sale::where('cash_register_id', $register->id)
                ->where('payment_method', 'cash')
                ->where('status', 'completed')
                ->sum('total');

            // Calcular efectivo esperado
            $expectedCash = $register->initial_cash + $cashSales;

            // Calcular diferencia
            $finalCash = $data['final_cash'];
            $difference = $finalCash - $expectedCash;

            // Actualizar caja
            $register->update([
                'closed_at' => now(),
                'final_cash' => $finalCash,
                'expected_cash' => $expectedCash,
                'difference' => $difference,
                'total_sales' => Sale::where('cash_register_id', $register->id)
                    ->where('status', 'completed')
                    ->sum('total'),
                'sales_count' => Sale::where('cash_register_id', $register->id)
                    ->where('status', 'completed')
                    ->count(),
                'notes' => $data['notes'] ?? null,
                'status' => 'closed',
            ]);

            return $register->fresh(['user', 'sales']);
        });
    }

    /**
     * Obtener resumen de caja actual
     */
    public function getCurrentSummary(CashRegister $register)
    {
        $sales = Sale::where('cash_register_id', $register->id)
            ->where('status', 'completed')
            ->get();

        return [
            'register' => $register,
            'total_cash' => $sales->where('payment_method', 'cash')->sum('total'),
            'total_credit_card' => $sales->where('payment_method', 'credit_card')->sum('total'),
            'total_debit_card' => $sales->where('payment_method', 'debit_card')->sum('total'),
            'total_sales' => $sales->sum('total'),
            'sales_count' => $sales->count(),
            'expected_cash' => $register->initial_cash + $sales->where('payment_method', 'cash')->sum('total'),
        ];
    }
}