<?php

namespace App\Services;

use App\Models\StudentContractInstallment;
use App\Models\UnitAccountPayable;
use Carbon\Carbon;

/**
 * Visão geral financeira da unidade: agrega Contas a Receber (parcelas de aluno)
 * e Contas a Pagar (unit_account_payables) do mês corrente.
 */
class UnitFinancialDashboardService
{
    public function overview(int $unitId): array
    {
        $start = Carbon::now()->startOfMonth()->toDateString();
        $end   = Carbon::now()->endOfMonth()->toDateString();
        $today = Carbon::today()->toDateString();

        // Recebíveis = parcelas de aluno
        $recPendingQ  = StudentContractInstallment::where('unit_id', $unitId)->where('status', 'pending');
        $recReceivedQ = StudentContractInstallment::where('unit_id', $unitId)
            ->where('status', 'paid')->whereBetween('payment_date', [$start, $end]);
        $recOverdueQ  = StudentContractInstallment::where('unit_id', $unitId)
            ->where('status', 'pending')->where('due_date', '<', $today);

        // Pagáveis
        $payPendingQ  = UnitAccountPayable::where('unit_id', $unitId)->where('status', 'pending');
        $payPaidQ     = UnitAccountPayable::where('unit_id', $unitId)
            ->where('status', 'paid')->whereBetween('payment_date', [$start, $end]);
        $payOverdueQ  = UnitAccountPayable::where('unit_id', $unitId)
            ->where('status', 'pending')->where('due_date', '<', $today);

        $receivedMonth = (float) (clone $recReceivedQ)->sum('paid_value');
        $paidMonth     = (float) (clone $payPaidQ)->sum('paid_value');

        return [
            'received_month'           => round($receivedMonth, 2),
            'received_month_count'     => (clone $recReceivedQ)->count(),
            'paid_month'               => round($paidMonth, 2),
            'paid_month_count'         => (clone $payPaidQ)->count(),
            'result_month'             => round($receivedMonth - $paidMonth, 2),

            'receivable_pending'       => round((float) (clone $recPendingQ)->sum('value'), 2),
            'receivable_pending_count' => (clone $recPendingQ)->count(),
            'payable_pending'          => round((float) (clone $payPendingQ)->sum('value'), 2),
            'payable_pending_count'    => (clone $payPendingQ)->count(),

            'overdue_receivable'       => round((float) (clone $recOverdueQ)->sum('value'), 2),
            'overdue_receivable_count' => (clone $recOverdueQ)->count(),
            'overdue_payable'          => round((float) (clone $payOverdueQ)->sum('value'), 2),
            'overdue_payable_count'    => (clone $payOverdueQ)->count(),
        ];
    }
}