import { Product } from './types';
import { clsx, type ClassValue } from 'clsx';
import { twMerge } from 'tailwind-merge';

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

export const formatCurrency = (value: number) => {
  return new Intl.NumberFormat('en-US', {
    style: 'currency',
    currency: 'USD',
    minimumFractionDigits: 0,
    maximumFractionDigits: 0,
  }).format(value);
};

export const formatPercent = (value: number) => {
  return new Intl.NumberFormat('en-US', {
    style: 'percent',
    minimumFractionDigits: 1,
    maximumFractionDigits: 1,
  }).format(value);
};

export const calculateProductMetrics = (product: Product, includeCOGS: boolean) => {
  const incentives = product.deals + product.promos;
  const cogsDeduction = includeCOGS ? product.cogs : 0;
  const totalDeductions = product.ppcSpend + incentives + product.chargebacks + cogsDeduction;
  const netMargin = product.grossSales - totalDeductions;
  const marginPercent = product.grossSales > 0 ? netMargin / product.grossSales : 0;
  const acos = product.grossSales > 0 ? product.ppcSpend / product.grossSales : 0;
  
  const chargebackIncrease = product.chargebacksPrevMonth > 0 
    ? (product.chargebacks - product.chargebacksPrevMonth) / product.chargebacksPrevMonth 
    : 0;
  const hasChargebackAnomaly = chargebackIncrease > 0.15;

  return {
    incentives,
    totalDeductions,
    netMargin,
    marginPercent,
    acos,
    chargebackIncrease,
    hasChargebackAnomaly
  };
};