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/*
 * Copyright (c) 2018 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 TMCAGLWM_POLICY_MANAGER_HPP
#define TMCAGLWM_POLICY_MANAGER_HPP


#include <unordered_map>
#include <vector>
#include <queue>

struct json_object;
struct sd_event;
struct sd_event_source;
struct StmState;


class PolicyManager {

public:
    explicit PolicyManager();
    ~PolicyManager() = default;

    using Handler = std::function<void(json_object *)>;

    typedef struct {
        Handler  onStateTransitioned;
        Handler  onError;
    } CallbackTable;

    int initialize();
    void registerCallback(CallbackTable callback_table);
    int setInputEventData(json_object* json_in);
    int executeStateTransition();
    void undoState();

    int transitionState(sd_event_source *source, void *data);
    int timerEvent(sd_event_source *source, uint64_t usec, void *data);

private:
    // Disable copy and move
    PolicyManager(PolicyManager const &) = delete;
    PolicyManager &operator=(PolicyManager const &) = delete;
    PolicyManager(PolicyManager &&) = delete;
    PolicyManager &operator=(PolicyManager &&) = delete;

    typedef struct EventInfo {
        int event;
        std::string role;
        uint64_t delay;
    } EventInfo;

    typedef struct AreaState {
        std::string name;
        std::string category;
        std::string role;
    } AreaState;

    typedef std::vector<AreaState> AreaList;
    typedef struct LayoutState {
        std::string name;
        std::map<std::string, int> category_num;
        AreaList area_list;
        std::map<std::string, std::vector<std::string>> role_history;
    } LayoutState;

    typedef struct LayerState {
        std::string name;
        LayoutState layout_state;
        bool changed;
    } LayerState;

    typedef struct CarElement {
        std::string state;
        bool changed;
    } CarElement;

    // Convert map
    std::unordered_map<std::string, int> eventname2no;
    std::unordered_map<std::string, int> categoryname2no;
    std::unordered_map<std::string, int> areaname2no;

    std::unordered_map<std::string, std::string> role2category;
    std::unordered_map<std::string, std::string> category2role;
    std::unordered_map<std::string, std::string> role2defaultarea;

    struct sd_event* event_loop;
    std::queue<EventInfo> event_info_queue;
    std::map<int, struct sd_event_source*> event_source_list;
    std::map<int, std::string> req_role_list;

    CallbackTable callback;

    std::unordered_map<std::string, CarElement> prv_car_elements;
    std::unordered_map<std::string, CarElement> crr_car_elements;

    std::unordered_map<std::string, LayerState> prv_layers;
    std::unordered_map<std::string, LayerState> crr_layers;

    std::unordered_map<std::string, LayerState> prv_layers_car_stop;

    std::unordered_map<std::string, LayoutState> default_layouts;

    void initializeState();
    void initializeCarElementState();
    void initializeLayerState();
    int initializeSdEventLoop();
    void updateState(int event_data, StmState crr_state);
    void updateCarElementState(StmState crr_state);
    void updateLayerState(int event_data, StmState crr_state);
    void createOutputInformation(StmState crr_state, json_object **json_out);
    void controlTimerEvent(StmState crr_state);
    int setStateTransitionProcessToSystemd(int event, uint64_t delay_ms, std::string role);

    // Load role.db
    int loadRoleDb();

    // Load layout.db
    int loadLayoutDb();

    void addStateToJson(const char* name, bool changed,
						std::string state, json_object** json_out);
    void addStateToJson(const char* layer_name, bool changed,
						AreaList area_list, json_object** json_out);
    const char* getStringFromJson(json_object* obj, const char* key);
    int inputJsonFilie(const char* file, json_object** obj);

    std::vector<std::string> parseString(std::string str, char delimiter);
    std::string deleteSpace(std::string str);
};


#endif  // TMCAGLWM_POLICY_MANAGER_HPP