// Arguments: Doubles, Doubles, Doubles, Doubles
#include <stan/math/prim/prob/pareto_type_2_ccdf_log.hpp>
#include <stan/math/prim/fun/log.hpp>

using stan::math::var;
using std::numeric_limits;
using std::vector;

class AgradCcdfLogParetoType2 : public AgradCcdfLogTest {
 public:
  void valid_values(vector<vector<double> >& parameters,
                    vector<double>& ccdf_log) {
    vector<double> param(4);

    param[0] = 0.1;  // y
    param[1] = 0;    // mu
    param[2] = 0.5;  // lambda
    param[3] = 3.0;  // alpha
    parameters.push_back(param);
    ccdf_log.push_back(
        std::log(0.5787037037037038311738));  // expected CCDF_log
  }

  void invalid_values(vector<size_t>& index, vector<double>& value) {
    // y
    index.push_back(0U);
    value.push_back(-1.0);

    // y_min
    index.push_back(2U);
    value.push_back(-1.0);

    index.push_back(2U);
    value.push_back(0.0);

    index.push_back(2U);
    value.push_back(numeric_limits<double>::infinity());

    // alpha
    index.push_back(3U);
    value.push_back(-1.0);

    index.push_back(3U);
    value.push_back(0.0);

    index.push_back(3U);
    value.push_back(numeric_limits<double>::infinity());
  }

  bool has_lower_bound() { return true; }

  double lower_bound() { return 0.0; }

  bool has_upper_bound() { return false; }

  template <typename T_y, typename T_loc, typename T_scale, typename T_shape,
            typename T4, typename T5>
  stan::return_type_t<T_y, T_loc, T_scale, T_shape> ccdf_log(
      const T_y& y, const T_loc& mu, const T_scale& lambda,
      const T_shape& alpha, const T4&, const T5&) {
    return stan::math::pareto_type_2_ccdf_log(y, mu, lambda, alpha);
  }

  template <typename T_y, typename T_loc, typename T_scale, typename T_shape,
            typename T4, typename T5>
  stan::return_type_t<T_y, T_loc, T_scale, T_shape> ccdf_log_function(
      const T_y& y, const T_loc& mu, const T_scale& lambda,
      const T_shape& alpha, const T4&, const T5&) {
    return -alpha * stan::math::log(1.0 + (y - mu) / lambda);
  }
};
