#include "finite_integral_calculation.h"
#include <assert.h>
#include <math.h>

namespace Probability {

FiniteIntegralCalculation::FiniteIntegralCalculation() :
  Calculation(),
  m_lowerBound(0.0f),
  m_upperBound(1.0f),
  m_result(0.0f)
{
  compute(0);
}

int FiniteIntegralCalculation::numberOfParameters() {
  return 3;
}

const char * FiniteIntegralCalculation::legendForParameterAtIndex(int index) {
  assert(index >= 0 && index < 3);
  if (index == 0) {
    return "P( ";
  }
  if (index == 1) {
    return " <= X <= ";
  }
  return " )= ";
}

void FiniteIntegralCalculation::setParameterAtIndex(float f, int index) {
  assert(index >= 0 && index < 3);
  if (index == 0) {
    m_lowerBound = f;
  }
  if (index == 1) {
    m_upperBound = f;
  }
  if (index == 2) {
    m_result = f;
  }
  compute(index);
}


float FiniteIntegralCalculation::parameterAtIndex(int index) {
  assert(index >= 0 && index < 3);
  if (index == 0) {
    return m_lowerBound;
  }
  if (index == 1) {
    return m_upperBound;
  }
  return m_result;
}

float FiniteIntegralCalculation::lowerBound() {
  return m_lowerBound;
}

float FiniteIntegralCalculation::upperBound() {
  return m_upperBound;
}

void FiniteIntegralCalculation::compute(int indexKnownElement) {
  if (m_law == nullptr) {
    return;
  }
  m_result = m_law->finiteIntegralBetweenAbscissas(m_lowerBound, m_upperBound);
}

}