//
//     Copyright 2013 Pixar
//
//     Licensed under the Apache License, Version 2.0 (the "License");
//     you may not use this file except in compliance with the License
//     and the following modification to it: Section 6 Trademarks.
//     deleted and replaced with:
//
//     6. Trademarks. This License does not grant permission to use the
//     trade names, trademarks, service marks, or product names of the
//     Licensor and its affiliates, except as required for reproducing
//     the content of the NOTICE file.
//
//     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 HUD_H
#define HUD_H

#include <vector>
#include <string>
#include <cstdarg>

#include "hud.h"

class Hud
{
public:
    typedef void (*RadioButtonCallback)(int c);
    typedef void (*CheckBoxCallback)(bool checked, int data);
    typedef void (*SliderCallback)(float value, int data);

    Hud();
    virtual ~Hud();

    virtual void Init(int width, int height);

    virtual void Rebuild(int width, int height);

    virtual bool Flush();

    bool IsVisible() const;

    void SetVisible(bool visible);

    void DrawString(int x, int y, const char *fmt, ...);

    void DrawString(int x, int y, float r, float g, float b, const char *fmt, ...);

    void Clear();

    void AddLabel(const char *label, int x, int y);

    void AddRadioButton(int group, const char *label, bool checked, int x, int y,
                        RadioButtonCallback callback=0, int data=0, int shortcut=0);

    void AddCheckBox(const char *label, bool checked, int x, int y,
                     CheckBoxCallback callback=0, int data=0, int shortcut=0);

    void AddSlider(const char *label, float min, float max, float value,
                   int x, int y, int width, bool intStep,
                   SliderCallback callback=0, int data=0);

    bool KeyDown(int key);

    bool MouseClick(int x, int y);

    bool MouseCapture() const;

    void MouseRelease();

    void MouseMotion(int x, int y);

    int GetWidth() const;

    int GetHeight() const;

protected:
    struct Item
    {
        int x, y, w, h;
        std::string label;
    };

    struct RadioButton : public Item
    {
        int group;
        int localIndex;
        bool checked;
        int shortcut;
        bool sharedShortcut;
        RadioButtonCallback callback;
        int callbackData;
    };

    struct CheckBox : public Item
    {
        bool checked;
        CheckBoxCallback callback;
        int callbackData;
        int shortcut;
    };

    struct Slider : public Item
    {
        float min, max;
        float value;
        SliderCallback callback;
        int callbackData;
        bool intStep;

        void SetValue(float v) {
            value = std::max(std::min(v, max), min);
        }
    };

    int drawString(std::vector<float> &vboSource, int x, int y,
                   float r, float g, float b, const char *c) const;

    int drawChar(std::vector<float> &vboSource, int x, int y,
                 float r, float g, float b, char ch) const;

    bool hitTest(Item const &item, int x, int y) const {
        int ix = item.x > 0 ? item.x : _windowWidth + item.x;
        int iy = item.y > 0 ? item.y : _windowHeight + item.y;
        return (x >= ix &&
                y >= iy &&
                x <= (ix + item.w) &&
                y <= (iy + item.h));
    }

    void getWindowPos(Item const &item, int *x, int *y) const {
        *x = item.x > 0 ? item.x : _windowWidth + item.x;
        *y = item.y > 0 ? item.y : _windowHeight + item.y;
    }

    std::vector<float> & getVboSource();
    std::vector<float> & getStaticVboSource();

private:
    bool _visible;
    std::vector<float> _vboSource, _staticVboSource;
    int _windowWidth, _windowHeight;
    bool _requiresRebuildStatic;
    std::vector<Item> _labels;
    std::vector<RadioButton> _radioButtons;
    std::vector<CheckBox> _checkBoxes;
    std::vector<Slider> _sliders;
    int _capturedSlider;

};

#endif // HUD_H