/*
 * File      : pm_animation.h
 * COPYRIGHT (C) 2012-2017, Shanghai Real-Thread Technology Co., Ltd
 *
 * Change Logs:
 * Date           Author       Notes
 * 2017-11-05     realthread   the first version
 */

#pragma once

#include <pm_widget.h>
#include <pm_window.h>
#include <pm_timer.h>
#include <vector>

namespace Persimmon
{

enum
{
    ANIM_TICK_RANGE = 1024,
};

class AnimAbstractAnimator
{
public:
    AnimAbstractAnimator(struct rtgui_dc *b) : buffer(b), wgt(NULL) {}
    AnimAbstractAnimator(Widget &w) : buffer(NULL), wgt(&w) {}

    virtual ~AnimAbstractAnimator()
    {
        if (wgt && buffer)
            rtgui_dc_destory(buffer);
    }

    virtual void act(struct rtgui_dc* dest_dc,
                     int progress) = 0;
protected:
    struct rtgui_dc *buffer;
    Widget *wgt;
};

class AnimFadeAnimator: public AnimAbstractAnimator
{
    typedef AnimAbstractAnimator super;

public:
    AnimFadeAnimator(struct rtgui_dc *buffer,
                     bool is_fade_out,
                     const Point &start_pt);
    AnimFadeAnimator(Widget &wgt,
                     bool is_fade_out,
                     const Point &start_pt);

    virtual ~AnimFadeAnimator();
    virtual void act(struct rtgui_dc *dest_dc, int progress);

protected:
    Point start_pt;
    bool is_fade_out;
};

class AnimMoveAnimator: public AnimAbstractAnimator
{
    typedef AnimAbstractAnimator super;

public:
    AnimMoveAnimator(struct rtgui_dc *buffer,
                     const Point &start_pt,
                     const Point &stop_pt);
    AnimMoveAnimator(Widget &wgt,
                     const Point &start_pt,
                     const Point &stop_pt);

    void enableFade(bool in, int min = 0, int max = 255)
    {
        is_fade_in = in;
        a_min = min;
        a_max = max;
        is_fade = true;
    }

    void disableFade(void)
    {
        is_fade = false;
    }

    virtual ~AnimMoveAnimator();
    virtual void act(struct rtgui_dc *dest_dc, int progress);

protected:
    Point start_pt, stop_pt;
    bool is_fade, is_fade_in;
    int a_min, a_max;
};

class AnimAbstractInterpolator
{
public:
    virtual ~AnimAbstractInterpolator() {}
    virtual int interpolate(int cur, int max) = 0;
};

class AnimLinearInterpolator: public AnimAbstractInterpolator
{
public:
    virtual ~AnimLinearInterpolator() {}
    virtual int interpolate(int cur, int max)
    {
        return cur * ANIM_TICK_RANGE / max;
    }
};

class AnimInsquareInterpolator : public AnimAbstractInterpolator
{
public:
    virtual ~AnimInsquareInterpolator() {}
    virtual int interpolate(int cur, int max)
    {
        /* Care about integer overflow. tick can within 0~(4G/RTGUI_ANIM_TICK_RANGE). */
        return cur * ANIM_TICK_RANGE / max * cur / max;
    }
};

class AnimOutsquareInterpolator : public AnimAbstractInterpolator
{
public:
    virtual ~AnimOutsquareInterpolator() {}
    virtual int interpolate(int cur, int max)
    {
        /* Care about integer overflow. tick can within 0~(4G/RTGUI_ANIM_TICK_RANGE). */
        cur = max - cur;
        return ANIM_TICK_RANGE - (cur * ANIM_TICK_RANGE / max * cur / max);
    }
};

class Animation: private utils::noncopyable<Animation>
{
public:
    Animation(Widget &w);
    ~Animation();

    Animation *setBGbuffer(struct rtgui_dc *dc)
    {
        m_bg = dc;
        return this;
    }
    Animation *setInterval(int inter)
    {
        m_interval = inter;
        return this;
    }
    Animation *setDuration(int dur)
    {
        m_duration = dur;
        return this;
    }
    Animation *setInterpolator(AnimAbstractInterpolator &inter)
    {
        m_interplator = &inter;
        return this;
    }

    Animation *addAnimator(AnimAbstractAnimator *anim)
    {
        m_animators.push_back(anim);
        return this;
    }

    Signal<struct rtgui_dc *, int> actSignal;
    Signal<void> endSignal;

    void start(bool is_modal=true);
    void stop();
    void exit();

private:
    Widget *m_owner;
    Timer *m_timer;
    struct rtgui_dc *m_bg, *saveDc;
    unsigned int m_interval, m_duration, m_tick_start;

    std::vector<AnimAbstractAnimator*> m_animators;
    AnimAbstractInterpolator *m_interplator;

    enum stat
    {
        ANIM_ST_NONE  = 0,
        ANIM_ST_MODAL = (1 << 0),
        ANIM_ST_STOP  = (0 << 1),
        ANIM_ST_RUN   = (1 << 1),
    } m_stat;

    void _drawframe();
};

}