/*
 * 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 <memory>
//#include <experimental/optional>
#include "windowmanager-client.hpp"

namespace wm {

/* using std::experimental::nullopt;
using std::experimental::optional; */

typedef enum Task{
    TASK_ALLOCATE,
    TASK_RELEASE
}ResourceTask;

struct WMTrigger {
    std::string appid;
    std::string role;
    std::string area;
    Task task;
};

struct WMAction
{
    std::string appid;
    std::string role;
    std::string area;
    bool end_draw_finished;
};

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

    unsigned seq_num;
    struct WMTrigger trigger;
    std::vector<struct WMAction> sync_draw_req;
};

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

    // Client Database Interface
    void addClient(const std::string &appid, const std::string &role);
    void removeClient(const std::string &appid);
    bool contains(const std::string &appid);
    int  countClient();
    std::shared_ptr<WMClient> lookUpClient(const std::string &appid);

    // Request Interface
    unsigned currentSequenceNumber();
    unsigned getSequenceNumber(const std::string &appid);
    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();
    bool     setAction(unsigned request_seq, const std::string &appid, const std::string &role, const std::string &area);
    bool     setEndDrawFinished(unsigned request_seq, const std::string &appid, const std::string &role);
    bool     endDrawFullfilled(unsigned request_seq);
    void     removeRequest(unsigned request_seq);
    void     next();
    bool     haveRequest();

    struct WMTrigger getRequest(unsigned request_seq);
    const std::vector<struct WMAction>& getActions(unsigned request_seq);

    void    client_dump();
    void    req_dump();

private:
  std::vector<WMRequest> req_list;
  std::unordered_map<std::string, std::shared_ptr<WMClient>> client_list;
  unsigned current_seq;
};

}
#endif // ALLOCATE_LIST_HPP