<?php

namespace App\Console\Commands;

use App\Models\LiabilityAccount;
use App\Models\LiabilityInstallment;
use Carbon\Carbon;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;

class GenerateDemoInstallments extends Command
{
    protected $signature = 'demo:generate-installments';
    protected $description = 'Gerar parcelas de exemplo para passivos DEMO que não têm parcelas';

    public function handle(): int
    {
        $this->info('Verificando passivos sem parcelas...');

        // Buscar passivos que têm total_installments > 0 mas não têm parcelas
        $accounts = LiabilityAccount::withCount('installments')
            ->having('installments_count', '=', 0)
            ->where('total_installments', '>', 0)
            ->get();

        if ($accounts->isEmpty()) {
            $this->info('Todos os passivos já têm parcelas geradas.');
            return Command::SUCCESS;
        }

        $this->info("Encontrados {$accounts->count()} passivos sem parcelas.");

        DB::beginTransaction();
        try {
            foreach ($accounts as $account) {
                $this->generateInstallments($account);
            }
            DB::commit();
            $this->info('✓ Parcelas geradas com sucesso!');
            return Command::SUCCESS;
        } catch (\Exception $e) {
            DB::rollBack();
            $this->error('Erro: ' . $e->getMessage());
            return Command::FAILURE;
        }
    }

    private function generateInstallments(LiabilityAccount $account): void
    {
        $this->info("Gerando parcelas para: {$account->name}");

        $totalInstallments = $account->total_installments;
        $paidInstallments = $account->paid_installments ?? 0;
        $principal = $account->principal_amount;
        $annualRate = $account->annual_interest_rate ?? 0;
        $monthlyRate = $annualRate / 12 / 100;
        $startDate = $account->first_due_date ?? $account->start_date ?? now();

        if (is_string($startDate)) {
            $startDate = Carbon::parse($startDate);
        }

        // Calcular parcela mensal (sistema PRICE)
        if ($monthlyRate > 0) {
            $pmt = $principal * ($monthlyRate * pow(1 + $monthlyRate, $totalInstallments)) / 
                   (pow(1 + $monthlyRate, $totalInstallments) - 1);
        } else {
            $pmt = $principal / $totalInstallments;
        }

        $balance = $principal;
        $installments = [];
        
        for ($i = 1; $i <= $totalInstallments; $i++) {
            $dueDate = $startDate->copy()->addMonths($i - 1);
            
            // Calcular juros e capital
            $interestAmount = $balance * $monthlyRate;
            $principalPaid = $pmt - $interestAmount;
            
            // Última parcela ajusta para zerar o saldo
            if ($i === $totalInstallments) {
                $principalPaid = $balance;
                $pmt = $principalPaid + $interestAmount;
            }

            $balance -= $principalPaid;

            // Determinar status
            $isPaid = $i <= $paidInstallments;
            $status = $isPaid ? 'paid' : ($dueDate->isPast() ? 'overdue' : 'pending');

            $installments[] = [
                'liability_account_id' => $account->id,
                'installment_number' => $i,
                'due_date' => $dueDate->format('Y-m-d'),
                'installment_amount' => round($pmt, 2),
                'principal_amount' => round($principalPaid, 2),
                'interest_amount' => round($interestAmount, 2),
                'fee_amount' => 0,
                'paid_amount' => $isPaid ? round($pmt, 2) : 0,
                'paid_date' => $isPaid ? $dueDate->format('Y-m-d') : null,
                'status' => $status,
                'created_at' => now(),
                'updated_at' => now(),
            ];
        }

        // Inserir em lotes
        foreach (array_chunk($installments, 50) as $chunk) {
            LiabilityInstallment::insert($chunk);
        }

        $this->info("  ✓ {$totalInstallments} parcelas criadas");

        // Recalcular totais
        $account->recalculateTotals();
    }
}