/*
 * 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 HOMESCREEN_CLIENTMANAGER_H
#define HOMESCREEN_CLIENTMANAGER_H

#include <string>
#include <mutex>
#include <memory>
#include <unordered_map>
#include <list>
#include <set>
#include "hs-helper.h"
#include "hs-client.h"

extern const std::string _listen_all;

class listener_interface {
public:
    listener_interface(std::string uid, std::set<std::string> listen_appid = std::set<std::string>()) : m_uid(uid), m_listen_appid(listen_appid) {}
    virtual ~listener_interface() {}
    virtual void notify(afb_api_t api, std::string appid = "") = 0;
    std::string myUid(void) {return m_uid;}
    std::set<std::string> listenAppSet(void) {return m_listen_appid;}
    void addListenAppId(std::string appid) {m_listen_appid.insert(appid);}
    bool isListenAppId(std::string &appid) {
        auto it = m_listen_appid.find(appid);
        return it != m_listen_appid.end() ? true : false;
    }
    bool listenAppEmpty(void) {return m_listen_appid.empty();}
    void clearListenAppSet(void) {m_listen_appid.clear();}
private:
    std::string m_uid;
    std::set<std::string> m_listen_appid;
};

typedef struct HS_ClientCtxt
{
    std::string id;
    HS_ClientCtxt(const char *appid)
    {
        id = appid;
    }
} HS_ClientCtxt;


class HS_ClientManager {
public:
    HS_ClientManager();
    ~HS_ClientManager() = default;
    HS_ClientManager(HS_ClientManager const &) = delete;
    HS_ClientManager &operator=(HS_ClientManager const &) = delete;
    HS_ClientManager(HS_ClientManager &&) = delete;
    HS_ClientManager &operator=(HS_ClientManager &&) = delete;

    static HS_ClientManager* instance(void);
    int init(void);
    int handleRequest(afb_req_t request, const char *verb, const char *appid = nullptr);
    int pushEvent(const char *event, struct json_object *param, std::string appid = "");
    void removeClientCtxt(void *data);  // don't use, internal only
    void setStartupAppid(const std::string &appid) {startup_appid = appid;}
    bool isAppStarted(const std::string &appid);
    void addListener(listener_interface* listener);
    void removeListener(listener_interface* listener);

private:
    HS_ClientCtxt* createClientCtxt(afb_req_t req, std::string appid);
    HS_Client* addClient(afb_req_t req, std::string appid);
    void removeClient(std::string appid);
    bool checkRegisterApp(afb_api_t api, const std::string &appid);
    void notifyListener(afb_api_t api, const std::string &appid);

private:
    static HS_ClientManager* me;
    std::unordered_map<std::string, std::list<listener_interface*>> listener_list;
    std::unordered_map<std::string, HS_Client*> client_list;
    std::unordered_map<std::string, HS_ClientCtxt*> appid2ctxt;
    std::mutex mtx;
    std::string startup_appid;
};

#endif // HOMESCREEN_CLIENTMANAGER_H