// Copyright (c) 2016-2018 Kiwano - Nomango
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#pragma once
#include <kiwano/core/ObjectBase.h>
#include <kiwano/core/Time.h>
#include <kiwano/core/IntrusiveList.h>

namespace kiwano
{
class TimerManager;

KGE_DECLARE_SMART_PTR(Timer);

/// \~chinese
/// @brief 定时器列表
typedef IntrusiveList<TimerPtr> TimerList;

/// \~chinese
/// @brief 定时器
/// @details 定时器用于每隔一段时间执行一次回调函数，且可以指定执行总次数
class KGE_API Timer
    : public ObjectBase
    , protected IntrusiveListValue<TimerPtr>
{
    friend class TimerManager;
    friend IntrusiveList<TimerPtr>;

public:
    /// \~chinese
    /// @brief 定时器回调函数
    /// @details
    /// 回调函数第一个参数是定时器自身，第二个参数是距离上次更新的时间间隔
    using Callback = Function<void(Timer* /* self */, Duration /* dt */)>;

    /// \~chinese
    /// @brief 创建定时器
    /// @param cb 回调函数
    /// @param interval 时间间隔
    /// @param times 执行次数（设 -1 为永久执行）
    static TimerPtr Create(const Callback& cb, Duration interval, int times = -1);

    /// \~chinese
    /// @brief 创建定时器
    /// @param name 名称
    /// @param cb 回调函数
    /// @param interval 时间间隔
    /// @param times 执行次数（设 -1 为永久执行）
    static TimerPtr Create(const String& name, const Callback& cb, Duration interval, int times = -1);

    /// \~chinese
    /// @brief 构造空定时器
    Timer();

    /// \~chinese
    /// @brief 启动定时器
    void Start();

    /// \~chinese
    /// @brief 停止定时器
    void Stop();

    /// \~chinese
    /// @brief 移除定时器
    void Remove();

    /// \~chinese
    /// @brief 定时器是否在运行
    bool IsRunning() const;

    /// \~chinese
    /// @brief 定时器是否可移除
    bool IsRemoveable() const;

    /// \~chinese
    /// @brief 获取定时器执行过回调函数的次数
    int GetRunTimes() const;

    /// \~chinese
    /// @brief 获取定时器执行回调函数的总次数
    int GetTotalRunTimes() const;

    /// \~chinese
    /// @brief 设置定时器执行回调函数的总次数
    void SetTotalRunTimes(int times);

    /// \~chinese
    /// @brief 获取定时器执行时间间隔
    Duration GetInterval() const;

    /// \~chinese
    /// @brief 设置定时器执行时间间隔
    void SetInterval(Duration interval);

    /// \~chinese
    /// @brief 获取定时器回调函数
    Callback GetCallback() const;

    /// \~chinese
    /// @brief 设置定时器回调函数
    void SetCallback(const Callback& callback);

private:
    /// \~chinese
    /// @brief 更新定时器
    void Update(Duration dt);

    /// \~chinese
    /// @brief 重置定时器
    void Reset();

private:
    bool     running_;
    bool     removeable_;
    int      run_times_;
    int      total_times_;
    Duration interval_;
    Duration elapsed_;
    Callback callback_;
};

inline void Timer::Start()
{
    running_ = true;
}

inline void Timer::Stop()
{
    running_ = false;
}

inline void Timer::Remove()
{
    removeable_ = true;
}

inline bool Timer::IsRunning() const
{
    return running_;
}

inline bool Timer::IsRemoveable() const
{
    return removeable_;
}

inline int Timer::GetRunTimes() const
{
    return run_times_;
}

inline int Timer::GetTotalRunTimes() const
{
    return total_times_;
}

inline void Timer::SetTotalRunTimes(int times)
{
    total_times_ = times;
}

inline Duration Timer::GetInterval() const
{
    return interval_;
}

inline void Timer::SetInterval(Duration interval)
{
    interval_ = interval;
}

inline Timer::Callback Timer::GetCallback() const
{
    return callback_;
}

inline void Timer::SetCallback(const Timer::Callback& callback)
{
    callback_ = callback;
}
}  // namespace kiwano