from flask import Blueprint, request, jsonify
from ..middleware import token_required

finance_blueprint = Blueprint('finance', __name__)

@finance_blueprint.route('/finance/calculate-pnl', methods=['POST'])
@token_required
def calculate_pnl(current_user_id):
    """
    Расчет чистой прибыли и маржинальности.
    """
    data = request.json
    
    # Входные данные
    sale_price = float(data.get('sale_price', 0))       # Цена продажи
    purchase_price = float(data.get('purchase_price', 0)) # Себестоимость (закупка)
    logistics = float(data.get('logistics', 0))         # Логистика
    commission_pct = float(data.get('commission_pct', 0)) # Комиссия маркетплейса %
    tax_pct = float(data.get('tax_pct', 6))             # Налог % (УСН)
    adv_per_unit = float(data.get('adv_per_unit', 0))   # Реклама на 1 шт
    other_costs = float(data.get('other_costs', 0))     # Прочие расходы (упаковка и т.д.)

    # Расчеты
    marketplace_commission = sale_price * (commission_pct / 100)
    taxes = sale_price * (tax_pct / 100)
    
    total_costs = (
        purchase_price + 
        logistics + 
        marketplace_commission + 
        taxes + 
        adv_per_unit + 
        other_costs
    )
    
    net_profit = sale_price - total_costs
    margin = (net_profit / sale_price * 100) if sale_price > 0 else 0
    roi = (net_profit / purchase_price * 100) if purchase_price > 0 else 0

    return jsonify({
        "net_profit": round(net_profit, 2),
        "margin": round(margin, 2),
        "roi": round(roi, 2),
        "total_costs": round(total_costs, 2),
        "tax_amount": round(taxes, 2),
        "commission_amount": round(marketplace_commission, 2)
    })