const RESIDENTIAL_MINIMAL_COST = 0.10;
const RESIDENTIAL_MEDIUM_COST = 0.15;
const RESIDENTIAL_MAX_COST = 0.20;


const COMMERCIAL_COST = 0.18
const COMMERCIAL_DISCUAL_PERCENTAGE = 0.90

const INDUSTRIAL_BASE_COST = 0.12
const INDUSTRIAL_BASE_CHARGE = 50;
const INDUSTRIAL_DISCOUNT_PERCENTAGE = 0.85

type clientType = "residential" | "commercial" | "industrial"


export function calculateElectricityBill(cost: number, clientType: clientType): number {
  let ELECTRICITY_COST = 0
  const MINIMAL_COST = 5

  // Calcular costo según el tipo de cliente
  ELECTRICITY_COST = getElectricityAmounts(clientType,cost)

  // Aplicar cobro mínimo si el costo calculado es menor al permitido
  if (ELECTRICITY_COST < MINIMAL_COST) ELECTRICITY_COST = MINIMAL_COST;
    
  

  return +ELECTRICITY_COST.toFixed(2);
}


function getElectricityAmounts(clientType:clientType, cost:number) {


  switch(clientType) {
    case "residential":
    if (cost <= 100) {
      cost = cost * RESIDENTIAL_MINIMAL_COST;
    } else if (cost <= 300) {
      cost = 100 * RESIDENTIAL_MINIMAL_COST + (cost - 100) * RESIDENTIAL_MEDIUM_COST;
    } else {
      cost = 100 * RESIDENTIAL_MINIMAL_COST + 200 * RESIDENTIAL_MEDIUM_COST + (cost - 300) * RESIDENTIAL_MAX_COST;
    }
    return cost;

    case "commercial":
      if (cost > 500) {
      cost = cost * COMMERCIAL_COST * COMMERCIAL_DISCUAL_PERCENTAGE;
    } else {
      cost = cost * COMMERCIAL_COST;
    }
    return cost;
    

    case "industrial":
    if (cost > 1000) {
      cost = cost * INDUSTRIAL_BASE_COST * INDUSTRIAL_DISCOUNT_PERCENTAGE + INDUSTRIAL_BASE_CHARGE;
    } else {
      cost = cost * INDUSTRIAL_BASE_COST + INDUSTRIAL_BASE_CHARGE;
    }
    return cost;
  }
}