#ifndef WORK_LIST_H_INCLUDED
#define WORK_LIST_H_INCLUDED

#include <vector>
#include <memory>

class UpdateCommand;


/**
 * @brief This class is responsible for calling the several binaries
 * \ref ATBUpdateTool consists of.
 *
 * This class maintains a worklist, which conists of entries of type UpdateCommand.
 *
 * @see UpdateCommand
 */
class WorkList {
    /**
     * @brief Actual worklist of items to be eecuted.
     */
    std::vector<std::unique_ptr<UpdateCommand>> m_workList;
public:
    unsigned m_workListIndex{0};

    WorkList() = default;

    /**
     * \brief Put new work item into worklist.
     *
     * \tparam arg Work item to be added to worklist.
     */
    template<typename T>
    void push_back(T&& arg) {
        m_workList.push_back(std::forward<T>(arg));
    }

    /**
     * \brief Check if worklist is empty.
     *
     * \retval true if worklist is empty.
     * \retval false otherwise.
     */
    bool empty() const { return m_workList.empty(); }

    // move constructor: pass in classes derived from UpdateCommand
    // template<typename... Ts>
             //typename = typename std::enable_if<std::is_same<typename std::decay<Ts...>::type,
             //                                   UpdateCommand>::value>::type>
    // WorkList(Ts&&... args)
    //  : m_workList(std::forward<Ts...>(args...))
    //  , m_workListIndex(0) {
    //}

    ///**
    // * \brief Put new work item into worklist.
    // *
    // */
    //unsigned nextExecIndex() const;

    /**
     * \brief Put new work item into worklist.
     *
     */
    bool nextExec() const;

    /**
     * \brief Put new work item into worklist.
     *
     * \param last
     */
    bool exec(bool last=false);

    /**
     * \brief Get current size of worklist.
     *
     * \retval Current size of worklist.
     */
    unsigned size() { return m_workList.size(); }
};

#endif // WORK_LIST_H_INCLUDED