//
// Created by m on 7/27/17.
//

#ifndef TMCAGLWM_LAYERS_H
#define TMCAGLWM_LAYERS_H

#include <algorithm>
#include <experimental/optional>
#include <json.hpp>
#include <set>
#include <string>

#include "result.hpp"

namespace wm {

struct surface_id_to_layer {
   int id_min = -1;
   int id_max = -1;
   std::string name = "";
   int layer_id = -1;

   explicit surface_id_to_layer(nlohmann::json const &j);

   bool operator<(struct surface_id_to_layer const &rhs) const {
      return this->id_max < rhs.id_max;
   }
};

inline bool operator<(struct surface_id_to_layer const &a, int b) {
   return a.id_max < b;
}

struct surface_id_to_layer_map {
   typedef std::set<struct surface_id_to_layer> map_type;

   map_type mapping;

   std::experimental::optional<int> get_layer_for_surface(int surface_id) {
      auto i = std::lower_bound(std::cbegin(this->mapping),
                                std::cend(this->mapping), surface_id);

      if (i != this->mapping.end()) {
         if (i->id_min <= surface_id) {
            return std::experimental::optional<int>(i->layer_id);
         }
      }

      return std::experimental::nullopt;
   }
};

struct result<struct surface_id_to_layer_map> to_surface_id_to_layer_map(
   nlohmann::json const &j);

}  // namespace wm

#endif  // TMCAGLWM_LAYERS_H