gen_utils.h

#pragma once

#ifndef gen_utils_h
#define gen_utils_h

#include "include_base_utils.h"
#include "common/util.h"

namespace gen_utils
{
  using namespace std;

  // ------------------------- VALUE RECONCILATION- ---------------------------

  // TODO: refactor common template code
  template <class T, typename std::enable_if<std::is_same<T, string>::value, T>::type* = nullptr>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, boost::optional<bool> resolve_defined, boost::optional<bool> resolve_true, boost::optional<bool> resolve_max, const string& err_msg = "") {

    // check for equality
    if (val1 == val2) return val1;

    // resolve one value none
    if (val1 == boost::none || val2 == boost::none) {
      if (resolve_defined != boost::none && *resolve_defined == false) return boost::none;
      else return val1 == boost::none ? val2 : val1;
    }

    throw runtime_error(string("Cannot reconcile strings: ") + to_string(val1) + string(" vs ") + to_string(val2) + (!err_msg.empty() ? string(". ") + err_msg : string("")));
  }
  template <class T, typename std::enable_if<std::is_same<T, string>::value, T>::type* = nullptr>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, const string& err_msg = "") {
    return reconcile(val1, val2, boost::none, boost::none, boost::none, err_msg);
  }

  template <class T, typename std::enable_if<std::is_integral<T>::value, T>::type* = nullptr>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, boost::optional<bool> resolve_defined, boost::optional<bool> resolve_true, boost::optional<bool> resolve_max, const string& err_msg = "") {

    // check for equality
    if (val1 == val2) return val1;

    // resolve one value none
    if (val1 == boost::none || val2 == boost::none) {
      if (resolve_defined != boost::none && *resolve_defined == false) return boost::none;
      else return val1 == boost::none ? val2 : val1;
    }

    // resolve different numbers
    if (resolve_max != boost::none) {
      return *resolve_max ? max(*val1, *val2) : min(*val1, *val2);
    }

    // throw runtime_error("Cannot reconcile values " + val1 + " and " + val2 + " with config: [" + resolve_defined + ", " + resolve_true + ", " + resolve_max + "]", val1, val2);
    throw runtime_error(string("Cannot reconcile integrals: ") + to_string(val1) + string(" vs ") + to_string(val2) + (!err_msg.empty() ? string(". ") + err_msg : string("")));
  }
  template <class T, typename std::enable_if<std::is_integral<T>::value, T>::type* = nullptr>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, const string& err_msg = "") {
    return reconcile(val1, val2, boost::none, boost::none, boost::none, err_msg);
  }

  template <class T, typename std::enable_if<std::is_same<T, bool>::value, T>::type>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, boost::optional<bool> resolve_defined, boost::optional<bool> resolve_true, boost::optional<bool> resolve_max, const string& err_msg = "") {

    // check for equality
    if (val1 == val2) return val1;

    // resolve one value none
    if (val1 == boost::none || val2 == boost::none) {
      if (resolve_defined != boost::none && *resolve_defined == false) return boost::none;
      else return val1 == boost::none ? val2 : val1;
    }

    // resolve different booleans
    if (resolve_true != boost::none) {
      return val1 == resolve_true ? val1 : val2; // if resolve true, return true, else return false
    } else {
      throw runtime_error(string("Cannot reconcile booleans: ") + to_string(val1) + string(" vs ") + to_string(val2) + (!err_msg.empty() ? string(". ") + err_msg : string("")));
    }
  }
  template <class T, typename std::enable_if<std::is_same<T, bool>::value, T>::type>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, const string& err_msg = "") {
    return reconcile(val1, val2, boost::none, boost::none, boost::none, err_msg);
  }

  template <class T>
  vector<T> reconcile(const vector<T>& v1, const vector<T>& v2, const string& err_msg = "") {

    // check for equality
    if (v1 == v2) return v1;

    // resolve one vector empty
    if (v1.empty()) return v2;
    if (v2.empty()) return v1;

    // otherwise cannot reconcile
    throw runtime_error("Cannot reconcile vectors" + (!err_msg.empty() ? string(". ") + err_msg : string("")));
  }
}
#endif /* gen_utils_h */