/* *******************************************************************
 *  Includes
 * ******************************************************************/

#include "Sprite.h"
#include "System.h"

/* *******************************************************************
 *  Defines
 * ******************************************************************/

/* *******************************************************************
 *  Types definition
 * ******************************************************************/

/* *******************************************************************
 *  Global variables definition
 * ******************************************************************/

const Camera* _cam;

/* *******************************************************************
 *  Local variables definition
 * ******************************************************************/

/* *******************************************************************
 *  Local prototypes declaration
 * ******************************************************************/

/* *******************************************************************
 *  Functions definition
 * ******************************************************************/

/*****************************************************************//**
 *
 * \brief   Constructor for Sprite class.
 *
 * \param   pu8SprData
 *              Pointer to raw sprite data.
 *
 * \param   _followCam
 *              Sprite is moved by camera. Default value is true.
 *
 * \param   u8Colour
 *              Sprite colour. Default value is BLACK.
 *
 * \param   rotation
 *              Sprite rotation. Default value is NOROT.
 *
 *********************************************************************/
Sprite::Sprite(const uint8_t* const pu8SprData, const bool followCam, const uint8_t u8Colour, const uint8_t rotation) :
_pu8SprData(pu8SprData),
_followCam(followCam),
_colour(u8Colour),
_rotation(rotation),
_x(0),
_y(0)
{
}

/*****************************************************************//**
 *
 * \brief   This function draws a \ref Sprite object on the screen.
 *
 * \remarks If \ref Sprite object must be followed by a \ref Camera
 *          object, X and Y coordinates are automatically adjusted.
 *
 *********************************************************************/
void Sprite::draw(void)
{
    gb.display.setColor(_colour, WHITE);

    if (_cam != NULL)
    {
        const int16_t x = _followCam ? _cam->getX(_x) : (int16_t)_x;
        const int16_t y = _followCam ? _cam->getY(_y) : (int16_t)_y;

        if (_pu8SprData != NULL)
        {
            gb.display.drawBitmap((int8_t)x, (int8_t)y, _pu8SprData);
        }
        else
        {
            /* Undefined sprite data. */
        }
    }
    else
    {
        /* Error: uninitialized camera. */
    }
}

uint8_t Sprite::getWidth(const uint8_t* const pu8SprData)
{
    enum
    {
        WIDTH_DATA_INDEX = 0
    };

    /* Retrieve unit width from sprite data. */
    const uint8_t w = pgm_read_byte(&pu8SprData[WIDTH_DATA_INDEX]);

    /* Return retrieved width. */
    return w;
}

uint8_t Sprite::getHeight(const uint8_t* const pu8SprData)
{
    enum
    {
        HEIGHT_DATA_INDEX = 1
    };

    /* Retrieve unit height from sprite data. */
    const uint8_t h = pgm_read_byte(&pu8SprData[HEIGHT_DATA_INDEX]);

    /* Return retrieved height. */
    return h;
}

/*****************************************************************//**
 *
 * \brief   Reportedly, this function updates X/Y coordinates for
 *          a Sprite object.
 *
 * \param   x
 *              X position, relative to screen coordinates origin.
 *
 * \param   y
 *              Y position, relative to screen coordinates origin.
 *
 *********************************************************************/
void Sprite::setPos(const uint8_t x, const uint8_t y)
{
    /* Update coords according to input parameters. */
    _x = x;
    _y = y;
}