<?php

namespace App\Services;

use App\Models\FranchiseeFnmBracket;
use App\Models\FranchiseeMaintenanceBracket;
use App\Models\FranchiseeRoyaltiesBracket;
use App\Models\FranchiseeTbr;
use App\Models\FranchiseeUnit;
use App\Models\TbrCalculation;
use App\Models\Unit;
use Illuminate\Support\Facades\DB;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Facades\Auth;

class TbrCalculationService
{
    private const ROYALTIES_REVENUE_RATE = 0.08;
    private const FNM_REVENUE_RATE       = 0.02;
    private const EXEMPT_THRESHOLD_MONTH = 3;

    public function paginate(int $perPage = 15): LengthAwarePaginator
    {
        return TbrCalculation::with(['unit', 'user'])
            ->orderBy('created_at', 'desc')
            ->paginate($perPage);
    }

    public function findById(int $id): ?TbrCalculation
    {
        return TbrCalculation::with([
            'unit',
            'user',
            'royaltiesBracket',
            'fnmBracket',
            'maintenanceBracket',
        ])->find($id);
    }

    public function calculate(array $data): TbrCalculation
    {
        return DB::transaction(function () use ($data) {
            $unit = Unit::findOrFail($data['unit_id']);

            $franchiseeUnit = FranchiseeUnit::where('unit_id', $unit->id)->firstOrFail();

            $franchiseeTbr = FranchiseeTbr::where('franchisee_id', $franchiseeUnit->franchisee_id)
                ->where('year', now()->year)
                ->firstOrFail();

            $tbrValue      = (float) $franchiseeTbr->tbr_value;
            $contractMonth = (int) $data['contract_month_reference'];
            $revenueValue  = (float) $data['revenue_value'];

            $royaltiesBracket  = $this->findBracket(FranchiseeRoyaltiesBracket::class, $franchiseeUnit->franchisee_id, $contractMonth);
            $fnmBracket        = $this->findBracket(FranchiseeFnmBracket::class, $franchiseeUnit->franchisee_id, $contractMonth);
            $maintenanceBracket = $this->findBracket(FranchiseeMaintenanceBracket::class, $franchiseeUnit->franchisee_id, $contractMonth);

            $royaltiesBracketValue  = round((float) $royaltiesBracket->percentage * $tbrValue, 2);
            $fnmBracketValue        = round((float) $fnmBracket->percentage * $tbrValue, 2);
            $maintenanceBracketValue = round((float) $maintenanceBracket->percentage * $tbrValue, 2);

            [$royaltiesEffectiveValue, $royaltiesEffectivePercentage, $royaltiesAppliedCriteria,
             $fnmEffectiveValue, $fnmEffectivePercentage] = $this->resolveEffectiveValues(
                $contractMonth,
                $revenueValue,
                $royaltiesBracket,
                $royaltiesBracketValue,
                $fnmBracket,
                $fnmBracketValue,
            );

            $maintenanceEffectiveValue      = $maintenanceBracketValue;
            $maintenanceEffectivePercentage = (float) $maintenanceBracket->percentage;

            $bracketSubtotal = round($royaltiesBracketValue + $fnmBracketValue + $maintenanceBracketValue, 2);
            $subtotal        = round($royaltiesEffectiveValue + $fnmEffectiveValue + $maintenanceEffectiveValue, 2);

            return TbrCalculation::create([
                'unit_id'                          => $unit->id,
                'revenue_value'                    => $revenueValue,
                'contract_month_reference'         => $contractMonth,
                'tbr_value'                        => $tbrValue,
                'royalties_bracket_id'             => $royaltiesBracket->id,
                'royalties_bracket_percentage'     => $royaltiesBracket->percentage,
                'royalties_bracket_value'          => $royaltiesBracketValue,
                'fnm_bracket_id'                   => $fnmBracket->id,
                'fnm_bracket_percentage'           => $fnmBracket->percentage,
                'fnm_bracket_value'                => $fnmBracketValue,
                'maintenance_bracket_id'           => $maintenanceBracket->id,
                'maintenance_bracket_percentage'   => $maintenanceBracket->percentage,
                'maintenance_bracket_value'        => $maintenanceBracketValue,
                'royalties_effective_percentage'   => $royaltiesEffectivePercentage,
                'royalties_effective_value'        => $royaltiesEffectiveValue,
                'fnm_effective_percentage'         => $fnmEffectivePercentage,
                'fnm_effective_value'              => $fnmEffectiveValue,
                'maintenance_effective_percentage' => $maintenanceEffectivePercentage,
                'maintenance_effective_value'      => $maintenanceEffectiveValue,
                'bracket_subtotal'                 => $bracketSubtotal,
                'subtotal'                         => $subtotal,
                'final_value'                      => $subtotal,
                'user_id'                          => Auth::id(),
                'royalties_applied_criteria'       => $royaltiesAppliedCriteria,
                'receivable_generated'             => false,
            ]);
        });
    }

    private function resolveEffectiveValues(
        int $contractMonth,
        float $revenueValue,
        FranchiseeRoyaltiesBracket $royaltiesBracket,
        float $royaltiesBracketValue,
        FranchiseeFnmBracket $fnmBracket,
        float $fnmBracketValue,
    ): array {
        if ($contractMonth <= self::EXEMPT_THRESHOLD_MONTH) {
            return [0.0, 0.0, 'tbr_fixo', 0.0, 0.0];
        }

        $royaltiesFromRevenue = round(self::ROYALTIES_REVENUE_RATE * $revenueValue, 2);
        $fnmFromRevenue       = round(self::FNM_REVENUE_RATE * $revenueValue, 2);

        if ($royaltiesBracketValue >= $royaltiesFromRevenue) {
            $royaltiesEffectiveValue      = $royaltiesBracketValue;
            $royaltiesEffectivePercentage = (float) $royaltiesBracket->percentage;
            $royaltiesAppliedCriteria     = 'tbr_fixo';
        } else {
            $royaltiesEffectiveValue      = $royaltiesFromRevenue;
            $royaltiesEffectivePercentage = self::ROYALTIES_REVENUE_RATE;
            $royaltiesAppliedCriteria     = 'percentual_faturamento';
        }

        if ($fnmBracketValue >= $fnmFromRevenue) {
            $fnmEffectiveValue      = $fnmBracketValue;
            $fnmEffectivePercentage = (float) $fnmBracket->percentage;
        } else {
            $fnmEffectiveValue      = $fnmFromRevenue;
            $fnmEffectivePercentage = self::FNM_REVENUE_RATE;
        }

        return [$royaltiesEffectiveValue, $royaltiesEffectivePercentage, $royaltiesAppliedCriteria, $fnmEffectiveValue, $fnmEffectivePercentage];
    }

    private function findBracket(string $modelClass, int $franchiseeId, int $contractMonth): mixed
    {
        return $modelClass::where('franchisee_id', $franchiseeId)
            ->where('start_month', '<=', $contractMonth)
            ->where(function ($q) use ($contractMonth) {
                $q->whereNull('end_month')->orWhere('end_month', '>=', $contractMonth);
            })
            ->firstOrFail();
    }
}