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/*
 * 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 ALLOCATE_LIST_HPP
#define ALLOCATE_LIST_HPP
#include <vector>
#include <string>
#include <map>
#include "windowmanager-client.hpp"

namespace wm {

typedef enum Task{
    TASK_ALLOCATE,
    TASK_RELEASE
}ResourceTask;

struct WMRequest{
    explicit WMRequest(std::string appid, std::string role,
        std::string area, ResourceTask task);
    virtual ~WMRequest();
    WMRequest(const WMRequest &obj);

    std::string appid;
    std::string role;
    std::string area;
    Task task;
    unsigned seq_num;
    bool end_draw_finished;
    bool allocating;
};

class  AllocateRequestList {
public:
    AllocateRequestList();
    virtual ~AllocateRequestList();
    AllocateRequestList(const AllocateRequestList &obj) = delete;

    // Client Database Interface
    bool addClient(WMClient *client);
    void removeClient(const std::string &appid);
    WMClient* lookUpClient(const std::string &appid);

    // Request Interface
    unsigned currentSequenceNumber();
    unsigned getSequenceNumber(const std::string &appid, const std::string &role, const std::string &area);
    unsigned addAllocateRequest(WMRequest req);
    /* TODO: consider, which is better WMClient or std::string appid?
    if appid is key to manage resources, it is better to select std::string
    otherwise WMClient is better, IMO */
    bool requestFinished();
    unsigned lookUpAllocatingApp(const char *appid);
    void setEndDrawFinished(unsigned request_seq, const std::string &role);
    bool endDrawFullfilled(unsigned request_seq);
    void removeRequest(unsigned request_seq);
    void setCurrentSequence(unsigned request_seq);
    bool haveRequest();
    /* void revertRequestingState();
    void removeAllRequesting(); */

    //void revertRequestingState();//???

    /* bool queue(int request_num);
    bool pushTop(int request_num);
    bool dequeue();
    void deleteAllElement();
    void removeElement(int request_num);
    bool hasElement(int request_num); */

private:
    std::vector<WMRequest> req_list;
    std::map<std::string, WMClient> client_list;
    unsigned seq_num;
};

}
#endif // ALLOCATE_LIST_HPP