/**
  WIP raycasting demo for Pokitto.

  Don't forget to compile with -O3!

  author: Miloslav "drummyfish" Ciz
  license: CC0 1.0
*/

#define FPS 60
#define PLAYER_SPEED (UNITS_PER_SQUARE * 3)

#include "general.hpp"

#define LEVEL_X_RES 32
#define LEVEL_Y_RES 16

Player player;

#define SHOT_SPEED 5 * UNITS_PER_SQUARE
#define INFO_BAR_START 70

const unsigned char level[] =
{
/*                    10  12  14  16  18  20  22  24  26  28  30
  0 1 2 3 4 5 6 7 8 9   11  13  15  17  19  21  23  25  27  29  31 */
  4,0,0,4,0,0,4,0,0,4,0,0,2,4,0,4,4,0,0,0,0,0,0,2,0,0,0,0,0,0,0,2, // 0
  0,0,0,0,0,0,0,0,0,0,0,0,3,4,0,0,0,0,1,3,2,4,0,4,0,0,0,0,0,0,0,0, // 1
  0,0,0,0,0,0,0,0,0,0,0,0,2,4,0,0,0,0,1,0,0,0,0,3,0,0,0,0,0,0,0,0, // 2
  0,0,4,0,0,0,0,0,0,0,0,0,2,4,4,0,3,1,1,0,2,1,2,3,0,0,1,0,1,0,0,2, // 3
  0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,2,0,0,0,2,0,0,0,0,0,0,0,0,0,2, // 4
  0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,2,3,0,2,2,0,0,0,0,0,0,0,0,0,2, // 5
  4,0,3,1,3,1,0,2,2,2,3,2,2,2,0,0,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 6
  0,0,2,0,0,0,0,0,0,4,0,0,0,0,0,0,0,2,0,0,0,0,1,2,0,3,4,0,0,0,0,0, // 7
  0,0,1,0,0,0,0,0,0,4,0,0,0,0,0,0,0,2,0,0,0,0,4,0,0,0,1,0,0,2,0,0, // 8
  0,0,2,0,0,0,0,0,0,2,3,2,4,0,0,0,2,2,4,1,4,0,4,4,4,3,2,0,0,4,2,2, // 9
  0,0,4,4,4,0,0,0,0,0,0,0,0,0,0,3,3,4,0,0,0,0,0,1,0,0,0,0,0,0,0,4, // 10
  2,0,0,0,3,0,0,0,0,0,0,0,0,0,3,3,2,4,0,0,0,0,0,1,0,0,4,0,0,3,0,1, // 11
  1,3,1,0,4,4,4,2,2,1,2,0,2,2,3,0,0,1,4,0,0,0,3,3,3,2,2,0,0,0,0,2, // 12
  0,0,0,0,0,0,0,0,0,4,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,0,1, // 13
  0,0,0,3,0,3,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4, // 14
  0,0,0,0,0,0,0,0,0,4,0,0,0,0,2,0,0,4,0,0,4,0,0,1,0,3,0,3,0,3,0,1  // 15
};

const unsigned char texture1[] =
{  32, 36 // width, height
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};

const unsigned char texture2[] =
{  32, 36 // width, height
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};

const unsigned char texture3[] =
{  32, 36 // width, height
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  ,0x09,0x09,0x11,0x08
};

const unsigned char texture4[] =
{  32, 36 // width, height
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  ,0x1a,0x10,0x08,0x63,0x63,0x63,0x5b,0x12,0x09,0x52,0x09,0x09,0x00,0x09
  ,0x59,0x11,0x09,0x09,0x59,0x09,0x00,0x09,0x00,0x00,0x00,0x09,0x09,0x09
  ,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09
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  ,0x09,0x11,0x11,0x11,0x11,0x09,0x59,0x09,0x00,0x09,0x00,0x00,0x00,0x09
  ,0x09,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x09,0x09,0x11,0x11
  ,0x09,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x09,0x09
  ,0x59,0x09,0x00,0x09,0x00,0x00,0x00,0x09,0x09,0x11,0x11,0x11,0x11,0x11
  ,0x11,0x11,0x11,0x11,0x09,0x09,0x11,0x11,0x09,0x11,0x11,0x11,0x11,0x11
  ,0x11,0x11,0x11,0x11,0x11,0x11,0x09,0x09,0x59,0x09,0x00,0x09,0x00,0x00
  ,0x00,0x09,0x09,0x09,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x09,0x09
  ,0x09,0x09,0x09,0x11,0x11,0x11,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09
  ,0x09,0x09,0x59,0x09
};

const unsigned char spritePlasma[] =
{  32, 32 // width, height
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  ,0xa8,0x60,0x60,0x07,0x07,0x07,0x07,0x07,0x07,0x10,0x58,0x07,0x07,0x07
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  ,0x60,0x61,0x60,0xa9,0x58,0xa8,0x58,0x58,0x07,0x07,0x07,0x07,0x07,0x07
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  ,0x48,0xa8,0xb1,0xb1,0xb1,0xb3,0xb1,0xb1,0xb1,0xb0,0xb1,0xb1,0xb1,0x60
  ,0x60,0x07,0x07,0x58,0x58,0x58,0x07,0x07,0x07,0x48,0x58,0x07,0x07,0x07
  ,0x08,0x07,0x58,0x58,0x60,0xb1,0xb2,0xb1,0xb1,0xb1,0xbb,0xbb,0xb1,0xb1
  ,0xb1,0x69,0xb1,0x60,0x58,0x07,0x07,0x58,0xa9,0x61,0x48,0x07,0x07,0x58
  ,0x10,0x58,0x60,0x07,0x07,0x58,0x58,0x60,0x69,0xb1,0xb1,0xb1,0xb1,0xb9
  ,0xbc,0xbc,0xbb,0xb1,0xb1,0xb1,0x69,0xb1,0x60,0x58,0x58,0xa8,0x69,0xb1
  ,0x58,0x58,0x58,0x58,0x07,0x60,0xb0,0x58,0x10,0x48,0x60,0x60,0xb1,0xb1
  ,0xb1,0xb1,0xb2,0xbb,0xbc,0xbd,0xbb,0xbb,0xb1,0xb1,0xb1,0xb1,0x60,0x60
  ,0x58,0x58,0xb1,0x69,0x69,0x58,0xa8,0x60,0x58,0x58,0xa8,0x58,0x07,0x58
  ,0x60,0xb0,0xb1,0xb2,0xb9,0xb1,0xbb,0xbb,0xbe,0xbc,0xbe,0xbc,0xb9,0xb1
  ,0xb1,0x69,0xb1,0x60,0x58,0x60,0xb0,0xb1,0xb0,0xb1,0xb0,0xa9,0x07,0x60
  ,0x58,0x58,0x07,0x07,0x48,0x58,0xa8,0xb1,0xb1,0xb1,0xb1,0xb1,0xb9,0xbc
  ,0xbc,0xb9,0xb1,0xb1,0x69,0xb1,0x69,0x60,0x58,0x60,0xa8,0x60,0x61,0x60
  ,0x60,0x58,0x07,0x48,0xa8,0x58,0x58,0x58,0x07,0x07,0x58,0x69,0xb1,0xb1
  ,0xb1,0xb1,0xbb,0xb9,0xbb,0xbb,0xb2,0xb1,0x69,0x69,0xa9,0x58,0x58,0x48
  ,0x58,0x60,0x60,0x60,0x48,0x58,0x07,0x07,0x48,0x58,0x58,0x58,0x07,0x07
  ,0x10,0x60,0xb1,0xb1,0xb1,0xb1,0xb9,0xbb,0xbb,0xb1,0xb9,0xb1,0x69,0xb1
  ,0x60,0x58,0x07,0x48,0x60,0x58,0x60,0x58,0x07,0x07,0x07,0x07,0x07,0x07
  ,0x58,0x58,0x07,0x07,0x48,0xa8,0xb1,0xb1,0xb1,0x69,0xbb,0xbb,0xb1,0xb1
  ,0xb1,0xb1,0xb1,0xa9,0x69,0x58,0x07,0x07,0x48,0x58,0x58,0x58,0x07,0x07
  ,0x07,0x07,0x07,0x07,0x48,0x07,0x07,0x07,0x58,0xb0,0xb1,0xa9,0x69,0xb1
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  ,0x58,0x58,0x07,0x07,0x07,0x07,0x07,0x58,0x58,0x10,0x07,0x07,0x48,0x60
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  ,0x07,0x07,0x10,0x60,0xa8,0x60,0x58,0x58,0x58,0x07,0x07,0x07,0x07,0x60
  ,0x60,0x58,0x07,0x07,0x07,0x07,0x07,0x07,0x58,0x58,0x59,0x60,0x60,0x60
  ,0x58,0x07,0x58,0x58,0x58,0x58,0x07,0x60,0x58,0x10,0x48,0x58,0x58,0x07
  ,0x07,0x07,0x07,0x48,0x58,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x48,0x60
  ,0x58,0x58,0x58,0x10,0x07,0x07,0x58,0x58,0x58,0x60,0x58,0x48,0x10,0x07
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};

const unsigned char *textures[] = {texture1, texture2, texture3, texture4};

Unit floorHeightAt(int16_t x, int16_t y)
{
  if (x >= 0 && x < LEVEL_X_RES && y >= 0 && y < LEVEL_Y_RES)
    return level[(LEVEL_Y_RES - y -1) * LEVEL_X_RES + x] == 0 ?
      0 : UNITS_PER_SQUARE * 2; 

  return UNITS_PER_SQUARE * 2;
}

Unit textureAt(int16_t x, int16_t y)
{
  if (x >= 0 && x < LEVEL_X_RES && y >= 0 && y < LEVEL_Y_RES)
    return max(level[(LEVEL_Y_RES - y -1) * LEVEL_X_RES + x] - 1,0); 

  return 0;
}

uint8_t cFloor, cCeiling;

Vector2D shotPosition;
Vector2D shotDirection;
bool shotFired = false;

uint8_t previousColumn = 255; ///< Helper for pixelIntensity.
int8_t pixelIntensity = 0; ///< Precomputed column intensity addition.

/**
  Function for drawing a single pixel (like fragment shader).
*/
inline void pixelFunc(PixelInfo pixel)
{
  if (pixel.position.y == MIDDLE_ROW)
    zBuffer[pixel.position.x] = pixel.depth;

  uint8_t c = 0;

  if (pixel.isWall)
  {
    c = sampleImage(textures[pixel.hit.type],pixel.hit.textureCoord,pixel.textureCoordY);

    if (previousColumn == pixel.position.x)
    {
      c = addIntensity(c,pixelIntensity);
    }
    else
    {
      // optimization: precompute intensity for the whole column
      pixelIntensity = 1 - pixel.depth / (UNITS_PER_SQUARE * 2) + (pixel.hit.direction % 2 == 0 ? 2 : 0);
      previousColumn = pixel.position.x;
    }
  }
  else
    c = pixel.isFloor ? cFloor: cCeiling;

  uint8_t *buf = pokitto.display.screenbuffer;

  buf += pixel.position.x * SUBSAMPLE;
  buf += pixel.position.y * pokitto.display.width;

  for (uint8_t i = 0; i < SUBSAMPLE - 1; ++i)
    *buf++ = c;

  *buf = c;
}

void draw()
{
  RayConstraints c;

  c.maxHits = 1;
  c.maxSteps = 20;
  c.computeTextureCoords = 1;

  render(player.mCamera,floorHeightAt,0,textureAt,pixelFunc,c);

  if (shotFired)
  {
    PixelInfo pos = mapToScreen(shotPosition,UNITS_PER_SQUARE,player.mCamera);

    drawSprite(spritePlasma,pos.position.x * SUBSAMPLE,
      pos.position.y,pos.depth,
      perspectiveScale(64,pos.depth));
  }

  pokitto.display.setColor(0xFF);
  pokitto.display.fillRect(0,INFO_BAR_START,SCREEN_WIDTH,SCREEN_HEIGHT - INFO_BAR_START);
}

int main()
{
  initGeneral();

  cFloor = rgbToIndex(0,1,1);
  cCeiling = rgbToIndex(1,0,1);

  player.setPositionSquare(6,5);
  player.mCamera.height = CAMERA_COLL_HEIGHT_BELOW;

  player.mCamera.resolution.y = INFO_BAR_START;

  uint32_t previousTime = 0;
  uint32_t dt;

  while (pokitto.isRunning())
  {
    if (pokitto.update())
    {
      draw();

      uint32_t timeNow = pokitto.getTime();
      dt = timeNow - previousTime;
      previousTime = timeNow;

      int16_t horizontalStep = (dt * PLAYER_SPEED * (pokitto.bBtn() ? 2 : 1)) / 1000;
      int16_t rotationStep = (dt * PLAYER_ROTATION_SPEED) / 1000;

      Vector2D d = angleToDirection(player.mCamera.direction);

      if (shotFired)
      {
        // update the shot

        Unit shotStep = (dt * SHOT_SPEED) / 1000;

        shotPosition.x += (shotStep * shotDirection.x) / UNITS_PER_SQUARE;
        shotPosition.y += (shotStep * shotDirection.y) / UNITS_PER_SQUARE;

        if (
         absVal(shotPosition.x - player.mCamera.position.x) > UNITS_PER_SQUARE * 5 ||
         absVal(shotPosition.y - player.mCamera.position.y) > UNITS_PER_SQUARE * 5 ||
         (textureAt(shotPosition.x / UNITS_PER_SQUARE,shotPosition.y / UNITS_PER_SQUARE) != 0)
         )
          shotFired = false;
      }
      else if (pokitto.cBtn())
      {
        shotPosition = player.mCamera.position;
        shotDirection = d;
        shotFired = true;
      }

      Vector2D moveOffset;
 
      moveOffset.x = 0;
      moveOffset.y = 0;

      d.x = (d.x * horizontalStep) / UNITS_PER_SQUARE;
      d.y = (d.y * horizontalStep) / UNITS_PER_SQUARE;

      if (d.x == 0 && d.y == 0)
      {
        d.x = d.x > 0 ? horizontalStep : -1 * horizontalStep;
        d.y = d.y > 0 ? horizontalStep : -1 * horizontalStep;
      }

      bool strafe = pokitto.aBtn();

      if (pokitto.upBtn())
      {
          moveOffset = d;
      }
      else if (pokitto.downBtn())
      {
        moveOffset.x = -1 * d.x;
        moveOffset.y = -1 * d.y;
      }

      int addition = 0;

      if (pokitto.rightBtn())
        addition = 1;      
      else if (pokitto.leftBtn())
        addition = -1;

      if (strafe)
      {
        d = angleToDirection(player.mCamera.direction + UNITS_PER_SQUARE / 4);
        d.x = (d.x * horizontalStep * addition) / UNITS_PER_SQUARE;
        d.y = (d.y * horizontalStep * addition) / UNITS_PER_SQUARE;

        moveOffset = d;
      }
      else
        player.mCamera.direction += addition * rotationStep;
    
      Unit prevHeight = player.mCamera.height;

      moveCameraWithCollision(&player.mCamera,moveOffset,0,
        floorHeightAt, 0, 0);

      Unit heightDiff = player.mCamera.height - prevHeight;
    }
  }

  return 0;
}