-- Genre one of milestone 4:  racing.  A car on the engine's vehicle physics driven by the keys,
-- a rival that drives a track of points on its own, checkpoints that are triggers, laps counted
-- by rules, and a camera that follows.
return {
	title  = "Author test:  racing",
	size   = { w = 720, h = 480 },
	layers = { { kind = "scene3d", ambient = { r = 90, g = 90, b = 110 }, fov = 60 }, { kind = "overlay" } },
	vars   = { score = 0, laps = 0, next = 1 },

	kinds = {
		ground  = { look = { kind = "mesh", shape = "box", w = 120, h = 0.4, d = 200, r = 90, g = 100, b = 90 }, behaviours = { { kind = "solid" } } },
		car     = { look = { kind = "mesh", shape = "box", w = 1.6, h = 0.6, d = 3.2, r = 220, g = 60, b = 60 },
		            behaviours = { { kind = "keys", player = 1, left = "LEFT", right = "RIGHT", up = "UP", down = "DOWN" },
		                           { kind = "vehicle", type = "car", torque = 900, mass = 800 } } },
		rival   = { look = { kind = "mesh", shape = "box", w = 1.6, h = 0.6, d = 3.2, r = 60, g = 90, b = 220 },
		            behaviours = { { kind = "vehicle", type = "car", torque = 700, mass = 800 },
		                           { kind = "racer", track = "lap", throttle = 0.5, reach = 4 } } },
		gate    = { look = { kind = "none", w = 10, h = 3, d = 1 }, vars = { index = 1 }, behaviours = { { kind = "trigger" } } },
		camera  = { look = { kind = "none" }, behaviours = { { kind = "camera", mode = "follow", target = "car", x = 0, y = 4, z = 9, lookY = 0.5, lag = 0.3 } } },
		bar     = { look = { kind = "mesh", shape = "box", w = 4, h = 0.3, d = 0.3, r = 200, g = 200, b = 60 },
		            behaviours = { { kind = "body", mass = 20 }, { kind = "joint", type = "hinge", ax = -8, ay = 2, az = -20, dx = 0, dy = 0, dz = 1 } } },
		hover   = { look = { kind = "mesh", shape = "box", w = 1.2, h = 0.4, d = 2, r = 60, g = 220, b = 200 },
		            behaviours = { { kind = "body", mass = 100, friction = 0 }, { kind = "thrust", force = 900, turn = 0.5 } } },
		readout = { look = { kind = "text", text = "", r = 235, g = 235, b = 245 } }
	},

	rooms = {
		{ name = "track",
		  entities = {
			{ kind = "ground",  id = "ground",  x = 0,  y = -0.2, z = -40 },
			{ kind = "car",     id = "car",     x = 0,  y = 0.8,  z = 10  },
			{ kind = "rival",   id = "rival",   x = 4,  y = 0.8,  z = 12  },
			{ kind = "gate",    id = "gate1",   x = 0,  y = 1.5,  z = -10, vars = { index = 1 } },
			{ kind = "gate",    id = "gate2",   x = 0,  y = 1.5,  z = -35, vars = { index = 2 } },
			{ kind = "camera",  id = "camera",  x = 0,  y = 4,    z = 19  },
			{ kind = "bar",     id = "bar",     x = -6, y = 2,    z = -20 },
			{ kind = "hover",   id = "hover",   x = 8,  y = 0.4,  z = 10  },
			{ kind = "readout", id = "readout", x = 12, y = 12,   z = 0   }
		  },
		  tracks = {
			{ name = "lap", key = "time", points = { { at = 0, x = 4, y = 0, z = -10 }, { at = 1, x = 4, y = 0, z = -35 }, { at = 2, x = 4, y = 0, z = -70 } } }
		  } }
	},

	rules = {
		{ note = "Through the next gate",
		  on   = "enter", a = "gate", b = "car",
		  when = { { "test", expr = "self.index == next" } },
		  act  = { { "addVar", name = "next", amount = 1 },
		           { "addScore", amount = 10 } } },

		{ note = "Both gates passed:  a lap",
		  on   = "frame",
		  when = { { "test", expr = "next > 2" } },
		  act  = { { "addVar", name = "laps", amount = 1 },
		           { "setVar", name = "next", value = 1 } } },

		{ note = "The hovercraft pushes forward on its own",
		  on   = "frame", each = "hover",
		  act  = { { "setVar", entity = "self", name = "dy", value = -1 } } },

		{ note = "The readout, every frame",
		  on   = "frame",
		  act  = { { "setText", entity = "readout", text = '"speed " .. floor(car.speed) .. "  next gate " .. next .. "  laps " .. laps' } } }
	}
}