/*
 * Copyright (c) 2017 TOYOTA MOTOR CORPORATION
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef WM_LAYERS_H
#define WM_LAYERS_H

#include <string>
#include <vector>
#include <unordered_map>
#include <memory>
#include "wm_error.hpp"

namespace wm
{

class LayerState
{
  public:
    LayerState();
    ~LayerState() = default;
  private:
    std::vector<unsigned> _ivi_layer_id_list;
    std::unordered_map<std::string, unsigned> area2ivi_layer_id;
    // std::map<std::string, unsigned> _render_order;
};

class LayerSetting
{
  public:
    enum MANAGEMENT_TYPE
    {
        TILE,
        STACK
    };

    explicit LayerSetting(const std::string& name, MANAGEMENT_TYPE type, unsigned begin, unsigned end);
    ~LayerSetting() = default;

    const std::string& layerName() { return this->name; }
    MANAGEMENT_TYPE layerType() { return this->type; };
    void appendRole(const std::string& role);
    void appendArea(const std::string& area);
    unsigned idBegin() { return this->id_begin; }
    unsigned idEnd()   { return this->id_end; }
    unsigned getNewLayerID(const std::string& role);
    void removeLayerID(unsigned id);

/*     unsigned getNewID(const std::string& role);
    void remove(unsigned ivi_layer_id);
    void clear();
    bool attach(unsigned ivi_layer_id, const std::string& area);
    void stack(unsigned ivi_layer_id, const std::string& area);
    bool updateRenderOrder(const std::vector<unsigned> list); */

  private:
    std::string name = ""; // Layer name
    MANAGEMENT_TYPE type;
    std::vector<std::string> role_list;
    std::vector<std::string> area_list;
    std::vector<unsigned>    id_list;
    unsigned id_begin;
    unsigned id_end;
};

class WMLayer
{
  public:
    WMLayer();
    ~WMLayer() = default;
    unsigned getNewLayerID(const std::string& role);
    LayerState getLayerState() const { return before_state; }
    WMError setLayerState(const LayerState& l);
    bool checkIDBelongTo(unsigned id);
  private:
    LayerState before_state;
    LayerState state;
    std::unique_ptr<LayerSetting> setting;
};

} // namespace wm

#endif // WM_LAYERS_H