<?php

namespace App\Services;

use App\Models\FranchiseeContract;
use Illuminate\Support\Collection;

class TbrBillingPreviewService
{
    private const MAINTENANCE_RATE = 0.30;
    private const EXEMPT_MONTHS    = 3;

    public function getAll(): Collection
    {
        $latestContracts = FranchiseeContract::with('unit')
            ->whereNotNull('tbr_fixed_value')
            ->whereNotNull('unit_id')
            ->orderByDesc('created_at')
            ->get()
            ->unique('unit_id')
            ->values();

        return $latestContracts->map(fn ($contract) => $this->buildPreview($contract));
    }

    private function buildPreview(FranchiseeContract $contract): array
    {
        $tbrValue      = (float) $contract->tbr_fixed_value;
        $contractMonth = $this->resolveContractMonth($contract);
        $isExempt      = $contractMonth <= self::EXEMPT_MONTHS;

        $royaltiesValue    = $isExempt ? 0.0 : round($tbrValue * (float) $contract->tbr_fixed_value_percentage, 2);
        $fnmValue          = $isExempt ? 0.0 : round($tbrValue * (float) $contract->marketing_fund_percentage, 2);
        $maintenanceValue  = round($tbrValue * self::MAINTENANCE_RATE, 2);

        return [
            'id'               => $contract->unit_id,
            'unit_name'        => $contract->unit?->fantasy_name,
            'tbr_value'        => $tbrValue,
            'royalties_value'  => $royaltiesValue,
            'royalties_rule'   => 'Fixo TBR',
            'fnm_value'        => $fnmValue,
            'fnm_rule'         => 'Fixo TBR',
            'maintenance_value' => $maintenanceValue,
            'total'            => round($royaltiesValue + $fnmValue + $maintenanceValue, 2),
        ];
    }

    private function resolveContractMonth(FranchiseeContract $contract): int
    {
        $startDate = $contract->start_date ?? $contract->signature_date;

        if (!$startDate) {
            return 1;
        }

        return (int) $startDate->startOfMonth()->diffInMonths(now()->startOfMonth()) + 1;
    }
}