#include <stdlib.h>
#include <time.h>

#include <GL/gl.h>
#include <GL/glu.h>

#include "Spin.h"

#define SWITCH_TIME 5000

static const float directions[][3] = {
    {0, 0, 1}, {0, 0, -1}, {0, 1, 0}, {0, -1, 0}, {1, 0, 0}, {-1, 0, 0}
};

Spin::Spin()
{
    m_num_monitors = 1;
    m_monitor_info = new monitor_info_t[m_num_monitors];
    m_monitor_info[0].direction = 1;
    glGetFloatv(GL_MODELVIEW_MATRIX, &m_monitor_info[0].rotation[0]);
    m_last_switch_ticks = 0;
    m_last_ticks = 0;
    srand(time(NULL));
}

Spin::~Spin()
{
    delete[] m_monitor_info;
}

bool Spin::expose (GnomeScreensaver & gs)
{
    if (m_last_ticks == 0)
        m_last_switch_ticks = m_last_ticks = gs.getTicks();
    else if (gs.getTicks() - m_last_switch_ticks > SWITCH_TIME)
    {
        for (int i = 0; i < m_num_monitors; i++)
        {
            m_monitor_info[i].direction = (int) (rand() / (double)RAND_MAX *
                    sizeof(directions) / sizeof(directions[0]));
            if (m_monitor_info[i].direction
                    >= sizeof(directions) / sizeof(directions[0]))
                m_monitor_info[i].direction = 0;
        }
        m_last_switch_ticks = gs.getTicks();
    }

    int width = gs.getWidth() / m_num_monitors;
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    for (int monitor_num = 0; monitor_num < m_num_monitors; monitor_num++)
    {
        glViewport(width * monitor_num, 0, width, gs.getHeight());

        glLoadMatrixf(&m_monitor_info[monitor_num].rotation[0]);

        int direction = m_monitor_info[monitor_num].direction;
        glRotatef((gs.getTicks() - m_last_ticks) / 1000.0 * 360.0 / 4.0,
                directions[direction][0],
                directions[direction][1],
                directions[direction][2]);
        glGetFloatv(GL_MODELVIEW_MATRIX,
                &m_monitor_info[monitor_num].rotation[0]);

        m_logobox.draw();
    }
    m_last_ticks = gs.getTicks();

    return true;
}

bool Spin::configure (GnomeScreensaver & gs)
{
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0, gs.getAspectRatio() / gs.getNumMonitors(),
            0.01, 1000.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);

    m_num_monitors = gs.getNumMonitors();
    delete[] m_monitor_info;
    m_monitor_info = new monitor_info_t[m_num_monitors];
    for (int i = 0; i < m_num_monitors; i++)
    {
        m_monitor_info[i].direction = (int) (rand() / (double)RAND_MAX *
                sizeof(directions) / sizeof(directions[0]));
        if (m_monitor_info[i].direction
                >= sizeof(directions) / sizeof(directions[0]))
            m_monitor_info[i].direction = 0;
        glGetFloatv(GL_MODELVIEW_MATRIX, &m_monitor_info[i].rotation[0]);
    }

    return true;
}

bool Spin::update (GnomeScreensaver & gs)
{
    return true;
}