<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class BusinessSetting extends Model
{
    use HasFactory;

    protected $fillable = [
        'user_id',
        'currency',
        'name',
        'monthly_revenue',
        'fixed_expenses',
        'tax_rate',
        'sales_commission',
        'card_fee',
        'other_variable_costs',
        'investment_rate',
        'profit_margin',
        'markup_factor',
        'is_active',
    ];

    protected $casts = [
        'monthly_revenue' => 'decimal:2',
        'fixed_expenses' => 'decimal:2',
        'tax_rate' => 'decimal:2',
        'sales_commission' => 'decimal:2',
        'card_fee' => 'decimal:2',
        'other_variable_costs' => 'decimal:2',
        'investment_rate' => 'decimal:2',
        'profit_margin' => 'decimal:2',
        'markup_factor' => 'decimal:4',
        'is_active' => 'boolean',
    ];

    /**
     * Relacionamento com usuário
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    /**
     * Fichas técnicas que usam esta configuração
     */
    public function productSheets(): HasMany
    {
        return $this->hasMany(ProductSheet::class);
    }

    /**
     * Calcula o percentual de despesas fixas sobre a receita
     * 
     * @return float
     */
    public function getFixedExpensesRateAttribute(): float
    {
        if ($this->monthly_revenue <= 0) {
            return 0;
        }
        
        return round(($this->fixed_expenses / $this->monthly_revenue) * 100, 2);
    }

    /**
     * Calcula o total de custos variáveis (sem CMV)
     * 
     * @return float
     */
    public function getTotalVariableCostsAttribute(): float
    {
        return $this->tax_rate + 
               $this->sales_commission + 
               $this->card_fee + 
               $this->other_variable_costs;
    }

    /**
     * Calcula o fator de Markup usando a fórmula:
     * Markup = 1 / (1 - (Despesas Fixas % + Custos Variáveis % + Investimento % + Lucro %))
     * 
     * @return float
     */
    public function calculateMarkup(): float
    {
        // Converter percentuais para decimais
        $fixedExpensesRate = $this->fixed_expenses_rate / 100;
        $variableCosts = $this->total_variable_costs / 100;
        $investmentRate = $this->investment_rate / 100;
        $profitMargin = $this->profit_margin / 100;
        
        // Total de deduções
        $totalDeductions = $fixedExpensesRate + $variableCosts + $investmentRate + $profitMargin;
        
        // Verificar se é possível calcular (não pode ser >= 100%)
        if ($totalDeductions >= 1) {
            return 0; // Markup inválido - deduções >= 100%
        }
        
        // Fórmula: Markup = 1 / (1 - deduções)
        $markup = 1 / (1 - $totalDeductions);
        
        return round($markup, 4);
    }

    /**
     * Recalcula e salva o markup
     * 
     * @return float
     */
    public function recalculateMarkup(): float
    {
        $this->markup_factor = $this->calculateMarkup();
        $this->save();
        
        return $this->markup_factor;
    }

    /**
     * Calcula o preço de venda para um CMV dado
     * 
     * @param float $cmv Custo da Mercadoria Vendida
     * @return float
     */
    public function calculateSalePrice(float $cmv): float
    {
        $markup = $this->markup_factor ?? $this->calculateMarkup();
        
        if ($markup <= 0) {
            return 0;
        }
        
        return round($cmv * $markup, 2);
    }

    /**
     * Retorna o breakdown do Markup para exibição
     * 
     * @return array
     */
    public function getMarkupBreakdownAttribute(): array
    {
        return [
            'fixed_expenses_rate' => $this->fixed_expenses_rate,
            'tax_rate' => (float) $this->tax_rate,
            'sales_commission' => (float) $this->sales_commission,
            'card_fee' => (float) $this->card_fee,
            'other_variable_costs' => (float) $this->other_variable_costs,
            'total_variable_costs' => $this->total_variable_costs,
            'investment_rate' => (float) $this->investment_rate,
            'profit_margin' => (float) $this->profit_margin,
            'total_deductions' => $this->fixed_expenses_rate + $this->total_variable_costs + $this->investment_rate + $this->profit_margin,
            'markup_factor' => (float) ($this->markup_factor ?? $this->calculateMarkup()),
        ];
    }

    /**
     * Scope para buscar configurações ativas do usuário
     */
    public function scopeOfUser($query, $userId)
    {
        return $query->where('user_id', $userId);
    }

    /**
     * Scope para buscar apenas configurações ativas
     */
    public function scopeActive($query)
    {
        return $query->where('is_active', true);
    }
}