/**
 * Motor de Precios, Políticas de Cambio y Redondeo Automático al 5.000 Siguiente
 */

export const DEFAULT_MIN_PROFIT_MARGIN_PERCENT = 35; // % Mínimo de ganancia
export const DEFAULT_MIN_PROFIT_COP = 30000; // Margen mínimo en pesos
export const DEFAULT_SEPARATION_DEPOSIT_COP = 10000; // Separación fija
export const ROUND_STEP_COP = 5000; // Redondeo siempre al múltiplo de $5.000 superior

export const EXCHANGE_POLICY = {
  firstExchangeFree: true,
  badgeText: '1er Cambio de Talla GRATIS',
  shortNotice: 'Primer cambio de talla gratis. Cambios posteriores con flete estándar.',
  fullTerms: 'Cuentas con 1er cambio de talla 100% GRATIS dentro de los primeros 5 días. Para cambios adicionales o posteriores, el cliente asume el costo logístico del flete.',
};

export function formatCOP(amount: number): string {
  if (isNaN(amount)) return '$0';
  return '$' + Math.round(amount).toLocaleString('es-CO');
}

export function roundUpToNearest5000(amount: number): number {
  if (!amount || amount <= 0) return 0;
  return Math.ceil(amount / ROUND_STEP_COP) * ROUND_STEP_COP;
}

export function calculateRetailPrice(
  supplierPrice: number,
  minMarginPercent: number = DEFAULT_MIN_PROFIT_MARGIN_PERCENT,
  minMarginCop: number = DEFAULT_MIN_PROFIT_COP
): number {
  if (!supplierPrice || supplierPrice <= 0) return 0;
  const priceByPercent = supplierPrice * (1 + minMarginPercent / 100);
  const priceByFixed = supplierPrice + minMarginCop;
  const baseTargetPrice = Math.max(priceByPercent, priceByFixed);
  return roundUpToNearest5000(baseTargetPrice);
}

export function getPricingBreakdown(supplierCost: number, minMarginPercent: number = DEFAULT_MIN_PROFIT_MARGIN_PERCENT) {
  const retailPrice = calculateRetailPrice(supplierCost, minMarginPercent);
  const grossProfit = retailPrice - supplierCost;
  const realMarginPercent = Math.round((grossProfit / supplierCost) * 100);

  return {
    supplierCost,
    retailPrice,
    grossProfit,
    realMarginPercent,
    isCeiledTo5k: true,
  };
}

export function calculateAnchorPrice(retailPrice: number, discountPercentage: number = 30): number {
  if (!retailPrice || retailPrice <= 0) return 0;
  const anchor = retailPrice / (1 - discountPercentage / 100);
  return roundUpToNearest5000(anchor);
}

export function calculateSeparationBreakdown(
  totalAmount: number,
  depositAmount: number = DEFAULT_SEPARATION_DEPOSIT_COP
) {
  const deposit = Math.min(depositAmount, totalAmount);
  const balanceDue = Math.max(0, totalAmount - deposit);

  return {
    totalAmount,
    depositAmount: deposit,
    balanceDue,
    summaryText: `Separas hoy con ${formatCOP(deposit)} y cancelas ${formatCOP(balanceDue)} al recibir contraentrega en tu puerta.`,
    exchangeTerms: EXCHANGE_POLICY.shortNotice,
  };
}

export function generateSalesCopy(params: {
  productName: string;
  brand: string;
  retailPrice: number;
  sizes: string[];
  storeName?: string;
  cityName?: string;
  whatsappNumber?: string;
}): string {
  const {
    productName,
    brand,
    retailPrice,
    sizes,
    storeName = 'TIENDA DE CALZADO',
    cityName = 'Cali',
    whatsappNumber = '573134848203',
  } = params;

  const breakdown = calculateSeparationBreakdown(retailPrice);
  const sizesFormatted = sizes.join(' - ');
  const waLink = `https://wa.me/${whatsappNumber}?text=${encodeURIComponent(`Hola ${storeName}! Quiero pedir las zapatillas ${productName} (${brand}) en talla ___ para entrega contraentrega en ${cityName}.`)}`;

  return `✨ ${storeName.toUpperCase()} • LANZAMIENTO EXCLUSIVO ✨
👟 ${productName.toUpperCase()} (${brand})

📏 Tallas Disponibles: ${sizesFormatted} (Horma Nacional)
💎 PRECIO DE VENTA: ${formatCOP(retailPrice)} COP

🚚 ¡DOMICILIO EN ${cityName.toUpperCase()} Y ENVÍOS A TODO EL PAÍS!
🤝 PAGO CONTRAENTREGA: Cancelas al recibir el producto en tus manos.
⚡ SEPARA CON SOLO ${formatCOP(breakdown.depositAmount)} COP y cancelas ${formatCOP(breakdown.balanceDue)} al recibir.

🛡️ POLÍTICA DE GARANTÍA:
✅ Calidad Premium 100% garantizada
✅ ${EXCHANGE_POLICY.badgeText} (posteriores con flete estándar)

📲 ¡Pídelas antes de que se agote tu talla!
👉 Pedir directo por WhatsApp: ${waLink}`;
}

/**
 * Obtiene el precio exacto de venta de un producto según el estilo/color y la talla seleccionada.
 */
export function getProductEffectivePrice(
  product: {
    retailPrice: number;
    sizePrices?: Record<string, number>;
  },
  selectedColor?: {
    price?: number;
    sizePrices?: Record<string, number>;
  } | null,
  selectedSize?: string | null
): number {
  if (selectedColor && selectedSize && selectedColor.sizePrices && selectedColor.sizePrices[selectedSize]) {
    return selectedColor.sizePrices[selectedSize];
  }
  if (selectedSize && product.sizePrices && product.sizePrices[selectedSize]) {
    return product.sizePrices[selectedSize];
  }
  if (selectedColor && selectedColor.price && selectedColor.price > 0) {
    return selectedColor.price;
  }
  return product.retailPrice || 120000;
}

/**
 * Obtiene el rango de precios si varían según la talla o colorway
 */
export function getProductPriceRange(product: {
  retailPrice: number;
  sizePrices?: Record<string, number>;
  colors?: Array<{ price?: number; sizePrices?: Record<string, number> }>;
}): { minPrice: number; maxPrice: number; hasVariation: boolean } {
  const prices: number[] = [product.retailPrice || 120000];

  if (product.sizePrices) {
    Object.values(product.sizePrices).forEach((p) => {
      if (typeof p === 'number' && p > 0) prices.push(p);
    });
  }

  if (Array.isArray(product.colors)) {
    product.colors.forEach((c) => {
      if (c.price && c.price > 0) prices.push(c.price);
      if (c.sizePrices) {
        Object.values(c.sizePrices).forEach((p) => {
          if (typeof p === 'number' && p > 0) prices.push(p);
        });
      }
    });
  }

  const minPrice = Math.min(...prices);
  const maxPrice = Math.max(...prices);
  return {
    minPrice,
    maxPrice,
    hasVariation: minPrice !== maxPrice,
  };
}