/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of NVIDIA CORPORATION nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
   ParamListGL
   - class derived from ParamList to do simple OpenGL rendering of a parameter
   list sgg 8/2001
*/

#ifndef PARAMGL_H
#define PARAMGL_H

#if defined(__APPLE__) || defined(MACOSX)
#include <GLUT/glut.h>
#else
#include <GL/freeglut.h>
#endif

#include <param.h>
#include <string.h>

inline void beginWinCoords(void) {
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  glLoadIdentity();
  glTranslatef(0.0, (GLfloat)(glutGet(GLUT_WINDOW_HEIGHT) - 1.0), 0.0);
  glScalef(1.0, -1.0, 1.0);

  glMatrixMode(GL_PROJECTION);
  glPushMatrix();
  glLoadIdentity();
  glOrtho(0, glutGet(GLUT_WINDOW_WIDTH), 0, glutGet(GLUT_WINDOW_HEIGHT), -1, 1);

  glMatrixMode(GL_MODELVIEW);
}

inline void endWinCoords(void) {
  glMatrixMode(GL_PROJECTION);
  glPopMatrix();

  glMatrixMode(GL_MODELVIEW);
  glPopMatrix();
}

inline void glPrint(int x, int y, const char *s, void *font) {
  glRasterPos2f((GLfloat)x, (GLfloat)y);
  int len = (int)strlen(s);

  for (int i = 0; i < len; i++) {
    glutBitmapCharacter(font, s[i]);
  }
}

inline void glPrintShadowed(int x, int y, const char *s, void *font,
                            float *color) {
  glColor3f(0.0, 0.0, 0.0);
  glPrint(x - 1, y - 1, s, font);

  glColor3fv((GLfloat *)color);
  glPrint(x, y, s, font);
}

class ParamListGL : public ParamList {
 public:
  ParamListGL(const char *name = "")
      : ParamList(name),
        m_active(true),
        m_text_color_selected(1.0, 1.0, 1.0),
        m_text_color_unselected(0.75, 0.75, 0.75),
        m_text_color_shadow(0.0, 0.0, 0.0),
        m_bar_color_outer(0.25, 0.25, 0.25),
        m_bar_color_inner(1.0, 1.0, 1.0) {
    m_font = (void *)GLUT_BITMAP_9_BY_15;  // GLUT_BITMAP_8_BY_13;
    m_font_h = 15;
    m_bar_x = 260;
    m_bar_w = 250;
    m_bar_h = 10;
    m_bar_offset = 5;
    m_text_x = 5;
    m_separation = 15;
    m_value_x = 200;
    m_start_x = 0;
    m_start_y = 0;
  }

  void Render(int x, int y, bool shadow = false) {
    beginWinCoords();

    m_start_x = x;
    m_start_y = y;

    for (std::vector<ParamBase *>::const_iterator p = m_params.begin();
         p != m_params.end(); ++p) {
      if ((*p)->IsList()) {
        ParamListGL *list = (ParamListGL *)(*p);
        list->Render(x + 10, y);
        y += m_separation * list->GetSize();
      } else {
        if (p == m_current) {
          glColor3fv(&m_text_color_selected.r);
        } else {
          glColor3fv(&m_text_color_unselected.r);
        }

        if (shadow) {
          glPrintShadowed(x + m_text_x, y + m_font_h, (*p)->GetName().c_str(),
                          m_font,
                          (p == m_current) ? &m_text_color_selected.r
                                           : &m_text_color_unselected.r);
          glPrintShadowed(x + m_value_x, y + m_font_h,
                          (*p)->GetValueString().c_str(), m_font,
                          (p == m_current) ? &m_text_color_selected.r
                                           : &m_text_color_unselected.r);
        } else {
          glPrint(x + m_text_x, y + m_font_h, (*p)->GetName().c_str(), m_font);
          glPrint(x + m_value_x, y + m_font_h, (*p)->GetValueString().c_str(),
                  m_font);
        }

        glColor3fv((GLfloat *)&m_bar_color_outer.r);
        glBegin(GL_LINE_LOOP);
        glVertex2f((GLfloat)(x + m_bar_x), (GLfloat)(y + m_bar_offset));
        glVertex2f((GLfloat)(x + m_bar_x + m_bar_w),
                   (GLfloat)(y + m_bar_offset));
        glVertex2f((GLfloat)(x + m_bar_x + m_bar_w),
                   (GLfloat)(y + m_bar_offset + m_bar_h));
        glVertex2f((GLfloat)(x + m_bar_x),
                   (GLfloat)(y + m_bar_offset + m_bar_h));
        glEnd();

        glColor3fv((GLfloat *)&m_bar_color_inner.r);
        glRectf(
            (GLfloat)(x + m_bar_x), (GLfloat)(y + m_bar_offset + m_bar_h),
            (GLfloat)(x + m_bar_x + ((m_bar_w - 1) * (*p)->GetPercentage())),
            (GLfloat)(y + m_bar_offset + 1));

        y += m_separation;
      }
    }

    endWinCoords();
  }

  bool Mouse(int x, int y, int button = GLUT_LEFT_BUTTON,
             int state = GLUT_DOWN) {
    if ((y < m_start_y) ||
        (y > (int)(m_start_y + (m_separation * m_params.size()) - 1))) {
      m_active = false;
      return false;
    }

    m_active = true;

    int i = (y - m_start_y) / m_separation;

    if ((button == GLUT_LEFT_BUTTON) && (state == GLUT_DOWN)) {
#if defined(__GNUC__) && (__GNUC__ < 3)
      m_current = &m_params[i];
#else

      // MJH: workaround since the version of vector::at used here is
      // non-standard
      for (m_current = m_params.begin(); m_current != m_params.end() && i > 0;
           m_current++, i--)
        ;

        // m_current = (std::vector<ParamBase
        // *>::const_iterator)&m_params.at(i);
#endif

      if ((x > m_bar_x) && (x < m_bar_x + m_bar_w)) {
        Motion(x, y);
      }
    }

    return true;
  }

  bool Motion(int x, int y) {
    if ((y < m_start_y) ||
        (y > m_start_y + (m_separation * (int)m_params.size()) - 1)) {
      return false;
    }

    if (x < m_bar_x) {
      (*m_current)->SetPercentage(0.0);
      return true;
    }

    if (x > m_bar_x + m_bar_w) {
      (*m_current)->SetPercentage(1.0);
      return true;
    }

    (*m_current)->SetPercentage((x - m_bar_x) / (float)m_bar_w);
    return true;
  }

  void Special(int key, int x, int y) {
    if (!m_active) return;

    switch (key) {
      case GLUT_KEY_DOWN:
        Increment();
        break;

      case GLUT_KEY_UP:
        Decrement();
        break;

      case GLUT_KEY_RIGHT:
        GetCurrent()->Increment();
        break;

      case GLUT_KEY_LEFT:
        GetCurrent()->Decrement();
        break;

      case GLUT_KEY_HOME:
        GetCurrent()->Reset();
        break;

      case GLUT_KEY_END:
        GetCurrent()->SetPercentage(1.0);
        break;
    }

    glutPostRedisplay();
  }

  void SetFont(void *font, int height) {
    m_font = font;
    m_font_h = height;
  }

  void SetSelectedColor(float r, float g, float b) {
    m_text_color_selected = Color(r, g, b);
  }
  void SetUnSelectedColor(float r, float g, float b) {
    m_text_color_unselected = Color(r, g, b);
  }
  void SetBarColorInner(float r, float g, float b) {
    m_bar_color_inner = Color(r, g, b);
  }
  void SetBarColorOuter(float r, float g, float b) {
    m_bar_color_outer = Color(r, g, b);
  }

  void SetActive(bool b) { m_active = b; }

 private:
  void *m_font;
  int m_font_h;  // font height

  int m_bar_x;       // bar start x position
  int m_bar_w;       // bar width
  int m_bar_h;       // bar height
  int m_text_x;      // text start x position
  int m_separation;  // bar separation in y
  int m_value_x;     // value text x position
  int m_bar_offset;  // bar offset in y

  int m_start_x, m_start_y;

  bool m_active;

  struct Color {
    Color(float _r, float _g, float _b) {
      r = _r;
      g = _g;
      b = _b;
    }
    float r, g, b;
  };

  Color m_text_color_selected;
  Color m_text_color_unselected;
  Color m_text_color_shadow;
  Color m_bar_color_outer;
  Color m_bar_color_inner;
};

#endif