/*
 * File: mn_strategy.hpp
 * Created Date: Thursday February 17th 2022
 * Author: yangzilong (yangzilong@objecteye.com)
 * Description:
 * -----
 * Last Modified: Thursday, 17th February 2022 11:23:44 am
 * Modified By: yangzilong (yangzilong@objecteye.com>)
 * -----
 * Copyright 2022
 */
#pragma once
// m帧里面出现了n帧才会报警， 降低报警的话可以提高n的值
#include <vector>
#include "helpers/logger.hpp"

template<typename T>
class MNStrategy
{
public:

    MNStrategy(const unsigned _m = 0, const unsigned _n = 0)
    : target_m_(_m)
    , target_n_(_n)
    , current_m_(0)
    , current_n_(0)
    {}

    void set_target_m(const unsigned _val) noexcept
    {
        target_m_ = _val;
    }

    void set_target_n(const unsigned _val) noexcept
    {
        target_n_ = _val;
        if (target_n_ >= target_m_)
            LOG_ERROR("mn strategy `target_n` gt `target_m` ({} vs {})", _val, target_m_);
    }

    void update_m() noexcept
    {
        ++current_m_;
    }

    void update_n() noexcept
    {
        ++current_n_;
    }

    void reset_m() noexcept
    {
        current_m_ = 0;
    }

    void reset_n() noexcept
    {
        current_n_ = 0;
    }

    void try_reset() noexcept
    {
        if (current_m_ >= target_m_ && current_n_ < target_n_)
            reset();
    }

    void reset() noexcept
    {
        reset_m();
        reset_n();
    }

    bool check() const noexcept
    {
        return current_n_ >= target_n_;
    }


    bool update_and_check(const T &source, const T &target, const bool do_reset = false) noexcept
    {
        if (source == target)
            update_n();
        update_m();
        try_reset();
        return check_and_erase(do_reset);
    }


    bool update_and_check(const bool do_reset = false) noexcept
    {
        update_n();
        update_m();
        try_reset();
        return check_and_erase(do_reset);
    }

private:

    bool check_and_erase(const bool do_reset = false) noexcept
    {
        bool check_status = check();
        if (check_status && do_reset)
            reset();
        return check_status;
    }


    unsigned target_m_, target_n_;
    unsigned current_m_, current_n_;
};