/* Wall jump 1.0, by Violet CLM 
   http://www.jazz2online.com/snippets/155/wall-jump/ */

class PlayerWallJumpProperties {
	uint Stage = 0;
	bool FacingRight;
	int LastSlidingTick = 0;
	bool PressingJumpOneTickAgo = false;
	PlayerWallJumpProperties(){}
}
array<PlayerWallJumpProperties> PlayerWallJumpPropertiesArray(jjLocalPlayerCount);

void onPlayer(jjPLAYER@ play) {
	PlayerWallJumpProperties@ wallJumpProperties = @PlayerWallJumpPropertiesArray[play.localPlayerID];
	const bool pressingJump = play.keyJump;
	if (
		pressingJump &&
		!wallJumpProperties.PressingJumpOneTickAgo &&
		wallJumpProperties.Stage < 2 &&
		(jjGameTicks - wallJumpProperties.LastSlidingTick) < 10 //10 = number of ticks after technically letting go of the wall during which you can still start the jump. Higher numbers are more generous.
	) {
		wallJumpProperties.Stage = 2;
		jjSample(play.xPos, play.yPos, SOUND::COMMON_JUMP);
		play.ySpeed = play.jumpStrength;
		play.helicopter = 0;
		play.doubleJumpCount = 0;
	} else if (wallJumpProperties.Stage > 1) {
		if (++wallJumpProperties.Stage == 20)
			wallJumpProperties.Stage = 0;
		else {
			play.keyRight = wallJumpProperties.FacingRight;
			play.keyLeft = !wallJumpProperties.FacingRight;
			play.keyJump = true;
			play.helicopter = 0;
		}
	} else {
		const auto anim = play.curAnim - jjAnimSets[play.setID];
		const int xPosToTest = int(play.xPos) + (play.keyRight ? 13 : -13);
		uint16 tileIDToTest;
		if (
			(anim == RABBIT::FALL || anim == RABBIT::HELICOPTER) &&
			(play.keyRight || play.keyLeft) &&
			(jjMaskedPixel(xPosToTest, int(play.yPos)-8) && jjMaskedPixel(xPosToTest, int(play.yPos)+8))
			//put any additional conditions, e.g. events or tiles you can't slide on, here.
		) {
			play.helicopter = 0;
			wallJumpProperties.Stage = 1;
			wallJumpProperties.FacingRight = play.keyLeft;
			play.ySpeed = 0.25; //modify as desired if you don't like this sliding speed
			play.keyJump = false;
			wallJumpProperties.LastSlidingTick = jjGameTicks;
		} else if (wallJumpProperties.Stage == 1)
			wallJumpProperties.Stage = 0;
	}
	if (play.invisibility = wallJumpProperties.Stage == 1) { //this works for SP, but for MP you'd probably instead want to give everyone SPRITE::INVISIBLE all the time and draw non-local players in an onMain loop.
		if (play.blink == 0 || ((jjRenderFrame >> 2) & 1) == 1) {
			const int vDir = !play.antiGrav ? 1 : -1;
			jjDrawRotatedSprite(play.xPos - play.direction * 3, play.yPos, play.setID, RABBIT::SKID1, jjGameTicks>>4, 256 * play.direction * vDir, -play.direction, vDir, SPRITE::PLAYER, play.playerID);
		}
	}
	wallJumpProperties.PressingJumpOneTickAgo = pressingJump;
}