local PISTON_MAXIMUM_PUSH = 12

-- Get mesecon rules of pistons
local piston_rules =
{{x=0,  y=0,  z=1}, --everything apart from z- (pusher side)
 {x=1,  y=0,  z=0},
 {x=-1, y=0,  z=0},
 {x=0,  y=1,  z=0},
 {x=0,  y=-1, z=0}}

local piston_up_rules =
{{x=0,  y=0,  z=-1}, --everything apart from y+ (pusher side)
 {x=0,  y=0,  z=1},
 {x=-1, y=0,  z=0},
 {x=1,  y=0,  z=0},
 {x=0,  y=-1, z=0}}

local piston_down_rules =
{{x=0,  y=0,  z=-1}, --everything apart from y- (pusher side)
 {x=0,  y=0,  z=1},
 {x=-1,  y=0,  z=0},
 {x=1,  y=0,  z=0},
 {x=0,  y=1, z=0}}

local piston_get_rules = function (node)
	local rules = piston_rules
	for i = 1, node.param2 do
		rules = mesecon.rotate_rules_left(rules)
	end
	return rules
end

local piston_facedir_direction = function (node)
	local rules = {{x = 0, y = 0, z = -1}}
	for i = 1, node.param2 do
		rules = mesecon.rotate_rules_left(rules)
	end
	return rules[1]
end

local piston_get_direction = function (dir, node)
	if type(dir) == "function" then
		return dir(node)
	else
		return dir
	end
end

-- Remove pusher of piston.
-- To be used when piston was destroyed or dug.
local piston_remove_pusher = function (pos, oldnode)
	local pistonspec = minetest.registered_nodes[oldnode.name].mesecons_piston

	local dir = piston_get_direction(pistonspec.dir, oldnode)
	local pusherpos = vector.add(pos, dir)
	local pushername = minetest.get_node(pusherpos).name

	if pushername == pistonspec.pusher then -- make sure there actually is a pusher
		minetest.remove_node(pusherpos)
		core.check_for_falling(pusherpos)
		minetest.sound_play("piston_retract", {
			pos = pos,
			max_hear_distance = 31,
			gain = 0.3,
		})
	end
end

-- Remove base node of piston.
-- To be used when pusher was destroyed.
local piston_remove_base = function (pos, oldnode)
	local basenodename = minetest.registered_nodes[oldnode.name].corresponding_piston
	local pistonspec = minetest.registered_nodes[basenodename].mesecons_piston

	local dir = piston_get_direction(pistonspec.dir, oldnode)
	local basepos = vector.subtract(pos, dir)
	local basename = minetest.get_node(basepos).name

	if basename == pistonspec.onname then -- make sure there actually is a base node
		minetest.remove_node(basepos)
		core.check_for_falling(basepos)
		minetest.sound_play("piston_retract", {
			pos = pos,
			max_hear_distance = 31,
			gain = 0.3,
		})
	end
end

local piston_on = function (pos, node)
	local pistonspec = minetest.registered_nodes[node.name].mesecons_piston

	local dir = piston_get_direction(pistonspec.dir, node)
	local np = vector.add(pos, dir)
	local success, stack, oldstack = mesecon.mvps_push(np, dir, PISTON_MAXIMUM_PUSH)
	if success then
		minetest.add_node(pos, {param2 = node.param2, name = pistonspec.onname})
		minetest.add_node(np, {param2 = node.param2, name = pistonspec.pusher})
		local below = minetest.get_node({x=np.x,y=np.y-1,z=np.z})
		if below.name == "mcl_farming:soil" or below.name == "mcl_farming:soil_wet" then
			minetest.set_node({x=np.x,y=np.y-1,z=np.z}, {name = "mcl_core:dirt"})
		end
		mesecon.mvps_process_stack(stack)
		mesecon.mvps_move_objects(np, dir, oldstack)
		minetest.sound_play("piston_extend", {
			pos = pos,
			max_hear_distance = 31,
			gain = 0.3,
		})
	end
end

local piston_off = function (pos, node)
	local pistonspec = minetest.registered_nodes[node.name].mesecons_piston
	minetest.add_node(pos, {param2 = node.param2, name = pistonspec.offname})
	piston_remove_pusher (pos, node)

	if pistonspec.sticky then
		local dir = piston_get_direction(pistonspec.dir, node)
		local pullpos = vector.add(pos, vector.multiply(dir, 2))
		local stack = mesecon.mvps_pull_single(pullpos, vector.multiply(dir, -1), PISTON_MAXIMUM_PUSH)
		mesecon.mvps_process_stack(pos, dir, stack)
	end
end

local piston_orientate = function (pos, placer)
	-- not placed by player
	if not placer then return end

	-- placer pitch in degrees
	local pitch = placer:get_look_vertical() * (180 / math.pi)

	local node = minetest.get_node(pos)
	local pistonspec = minetest.registered_nodes[node.name].mesecons_piston
	if pitch > 55 then
		minetest.add_node(pos, {name=pistonspec.piston_up})
	elseif pitch < -55 then
		minetest.add_node(pos, {name=pistonspec.piston_down})
	end
end


-- Horizontal pistons

local pt = 4/16 -- pusher thickness

local piston_pusher_box = {
	type = "fixed",
	fixed = {
		{-2/16, -2/16, -.5 + pt, 2/16, 2/16,  .5 + pt},
		{-.5  , -.5  , -.5     , .5  , .5  , -.5 + pt},
	}
}

local piston_on_box = {
	type = "fixed",
	fixed = {
		{-.5, -.5, -.5 + pt, .5, .5, .5}
	}
}


-- Normal (non-sticky) ones:

local pistonspec_normal = {
	offname = "mesecons_pistons:piston_normal_off",
	onname = "mesecons_pistons:piston_normal_on",
	dir = piston_facedir_direction,
	pusher = "mesecons_pistons:piston_pusher_normal",
	piston_down = "mesecons_pistons:piston_down_normal_off",
	piston_up   = "mesecons_pistons:piston_up_normal_off",
}

local usagehelp_piston = "This block can have one of 6 possible orientations. On placement, the pusher will face you."

local on_rotate
if minetest.get_modpath("screwdriver") then
	on_rotate = screwdriver.disallow
end

-- offstate
minetest.register_node("mesecons_pistons:piston_normal_off", {
	description = "Piston",
	_doc_items_longdesc = "A piston is a redstone component with a pusher which pushes the block or blocks in front of it when it is supplied with redstone power. Not all blocks can be pushed, however.",
	_doc_items_usagehelp = usagehelp_piston,
	tiles = {
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png^[transformR90",
		"mesecons_piston_bottom.png^[transformR270",
		"mesecons_piston_back.png",
		"mesecons_piston_pusher_front.png"
		},
	groups = {handy = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	after_place_node = piston_orientate,
	mesecons_piston = pistonspec_normal,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_on = piston_on,
		rules = piston_get_rules
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- onstate
minetest.register_node("mesecons_pistons:piston_normal_on", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png^[transformR90",
		"mesecons_piston_bottom.png^[transformR270",
		"mesecons_piston_back.png",
		"mesecons_piston_on_front.png"
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_normal_off",
	after_destruct = piston_remove_pusher,
	node_box = piston_on_box,
	selection_box = piston_on_box,
	mesecons_piston = pistonspec_normal,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_off = piston_off,
		rules = piston_get_rules
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- pusher
minetest.register_node("mesecons_pistons:piston_pusher_normal", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_pusher_top.png",
		"mesecons_piston_pusher_bottom.png",
		"mesecons_piston_pusher_left.png",
		"mesecons_piston_pusher_right.png",
		"mesecons_piston_pusher_back.png",
		"mesecons_piston_pusher_front.png"
		},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	after_destruct = piston_remove_base,
	diggable = false,
	corresponding_piston = "mesecons_pistons:piston_normal_on",
	selection_box = piston_pusher_box,
	node_box = piston_pusher_box,
	sounds = mcl_sounds.node_sound_wood_defaults(),
	_mcl_blast_resistance = 2.5,
	on_rotate = on_rotate,
})

-- Sticky ones

local pistonspec_sticky = {
	offname = "mesecons_pistons:piston_sticky_off",
	onname = "mesecons_pistons:piston_sticky_on",
	dir = piston_facedir_direction,
	pusher = "mesecons_pistons:piston_pusher_sticky",
	sticky = true,
	piston_down = "mesecons_pistons:piston_down_sticky_off",
	piston_up   = "mesecons_pistons:piston_up_sticky_off",
}

-- offstate
minetest.register_node("mesecons_pistons:piston_sticky_off", {
	description = "Sticky Piston",
	_doc_items_longdesc = "A sticky piston is a redstone component with a sticky pusher which can be extended and retracted. It extends when it is supplied with redstone power. When the pusher extends, it pushes the block or blocks in front of it. When it retracts, it pulls back the single block in front of it. Note that not all blocks can be pushed or pulled.",
	_doc_items_usagehelp = usagehelp_piston,

	tiles = {
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png^[transformR90",
		"mesecons_piston_bottom.png^[transformR270",
		"mesecons_piston_back.png",
		"mesecons_piston_pusher_front_sticky.png"
		},
	groups = {handy=1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	after_place_node = piston_orientate,
	mesecons_piston = pistonspec_sticky,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_on = piston_on,
		rules = piston_get_rules
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- onstate
minetest.register_node("mesecons_pistons:piston_sticky_on", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png^[transformR90",
		"mesecons_piston_bottom.png^[transformR270",
		"mesecons_piston_back.png",
		"mesecons_piston_on_front.png"
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_sticky_off",
	after_destruct = piston_remove_pusher,
	node_box = piston_on_box,
	selection_box = piston_on_box,
	mesecons_piston = pistonspec_sticky,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_off = piston_off,
		rules = piston_get_rules
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- pusher
minetest.register_node("mesecons_pistons:piston_pusher_sticky", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_pusher_top.png",
		"mesecons_piston_pusher_bottom.png",
		"mesecons_piston_pusher_left.png",
		"mesecons_piston_pusher_right.png",
		"mesecons_piston_pusher_back.png",
		"mesecons_piston_pusher_front_sticky.png"
		},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	after_destruct = piston_remove_base,
	diggable = false,
	corresponding_piston = "mesecons_pistons:piston_sticky_on",
	selection_box = piston_pusher_box,
	node_box = piston_pusher_box,
	sounds = mcl_sounds.node_sound_wood_defaults(),
	_mcl_blast_resistance = 2.5,
	on_rotate = on_rotate,
})

--
--
-- UP
--
--

local piston_up_pusher_box = {
	type = "fixed",
	fixed = {
		{-2/16, -.5 - pt, -2/16, 2/16, .5 - pt, 2/16},
		{-.5  ,  .5 - pt, -.5  , .5  , .5     ,   .5},
	}
}

local piston_up_on_box = {
	type = "fixed",
	fixed = {
		{-.5, -.5, -.5 , .5, .5-pt, .5}
	}
}

-- Normal

local pistonspec_normal_up = {
	offname = "mesecons_pistons:piston_up_normal_off",
	onname = "mesecons_pistons:piston_up_normal_on",
	dir = {x = 0, y = 1, z = 0},
	pusher = "mesecons_pistons:piston_up_pusher_normal"
}

-- offstate
minetest.register_node("mesecons_pistons:piston_up_normal_off", {
	tiles = {
		"mesecons_piston_pusher_front.png",
		"mesecons_piston_back.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_normal_off",
	mesecons_piston = pistonspec_normal_up,
	mesecons = {effector={
		action_on = piston_on,
		rules = piston_up_rules,
	}},
	sounds = mcl_sounds.node_sound_stone_defaults({
		footstep = mcl_sounds.node_sound_wood_defaults().footstep
	}),
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- onstate
minetest.register_node("mesecons_pistons:piston_up_normal_on", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_on_front.png",
		"mesecons_piston_back.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		},
	groups = {hanry=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_normal_off",
	after_destruct = piston_remove_pusher,
	node_box = piston_up_on_box,
	selection_box = piston_up_on_box,
	mesecons_piston = pistonspec_normal_up,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_off = piston_off,
		rules = piston_up_rules,
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- pusher
minetest.register_node("mesecons_pistons:piston_up_pusher_normal", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_pusher_front.png",
		"mesecons_piston_pusher_back.png",
		"mesecons_piston_pusher_left.png^[transformR270",
		"mesecons_piston_pusher_right.png^[transformR90",
		"mesecons_piston_pusher_bottom.png",
		"mesecons_piston_pusher_top.png^[transformR180",
		},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	after_destruct = piston_remove_base,
	diggable = false,
	corresponding_piston = "mesecons_pistons:piston_up_normal_on",
	selection_box = piston_up_pusher_box,
	node_box = piston_up_pusher_box,
	sounds = mcl_sounds.node_sound_wood_defaults(),
	_mcl_blast_resistance = 2.5,
	on_rotate = on_rotate,
})



-- Sticky


local pistonspec_sticky_up = {
	offname = "mesecons_pistons:piston_up_sticky_off",
	onname = "mesecons_pistons:piston_up_sticky_on",
	dir = {x = 0, y = 1, z = 0},
	pusher = "mesecons_pistons:piston_up_pusher_sticky",
	sticky = true
}

-- offstate
minetest.register_node("mesecons_pistons:piston_up_sticky_off", {
	tiles = {
		"mesecons_piston_pusher_front_sticky.png",
		"mesecons_piston_back.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_sticky_off",
	mesecons_piston = pistonspec_sticky_up,
	sounds = mcl_sounds.node_sound_stone_defaults({
		footstep = mcl_sounds.node_sound_wood_defaults().footstep
	}),
	mesecons = {effector={
		action_on = piston_on,
		rules = piston_up_rules,
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- onstate
minetest.register_node("mesecons_pistons:piston_up_sticky_on", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_on_front.png",
		"mesecons_piston_back.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		"mesecons_piston_bottom.png",
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_sticky_off",
	after_destruct = piston_remove_pusher,
	node_box = piston_up_on_box,
	selection_box = piston_up_on_box,
	mesecons_piston = pistonspec_sticky_up,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_off = piston_off,
		rules = piston_up_rules,
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- pusher
minetest.register_node("mesecons_pistons:piston_up_pusher_sticky", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_pusher_front_sticky.png",
		"mesecons_piston_pusher_back.png",
		"mesecons_piston_pusher_left.png^[transformR270",
		"mesecons_piston_pusher_right.png^[transformR90",
		"mesecons_piston_pusher_bottom.png",
		"mesecons_piston_pusher_top.png^[transformR180",
		},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	after_destruct = piston_remove_base,
	diggable = false,
	corresponding_piston = "mesecons_pistons:piston_up_sticky_on",
	selection_box = piston_up_pusher_box,
	node_box = piston_up_pusher_box,
	sounds = mcl_sounds.node_sound_wood_defaults(),
	_mcl_blast_resistance = 2.5,
	on_rotate = on_rotate,
})

--
--
-- DOWN
--
--

local piston_down_pusher_box = {
	type = "fixed",
	fixed = {
		{-2/16, -.5 + pt, -2/16, 2/16,  .5 + pt, 2/16},
		{-.5  , -.5     , -.5  , .5  , -.5 + pt,   .5},
	}
}

local piston_down_on_box = {
	type = "fixed",
	fixed = {
		{-.5, -.5+pt, -.5 , .5, .5, .5}
	}
}



-- Normal

local pistonspec_normal_down = {
	offname = "mesecons_pistons:piston_down_normal_off",
	onname = "mesecons_pistons:piston_down_normal_on",
	dir = {x = 0, y = -1, z = 0},
	pusher = "mesecons_pistons:piston_down_pusher_normal",
}

-- offstate
minetest.register_node("mesecons_pistons:piston_down_normal_off", {
	tiles = {
		"mesecons_piston_back.png",
		"mesecons_piston_pusher_front.png",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_normal_off",
	mesecons_piston = pistonspec_normal_down,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_on = piston_on,
		rules = piston_down_rules,
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- onstate
minetest.register_node("mesecons_pistons:piston_down_normal_on", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_back.png",
		"mesecons_piston_on_front.png",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_normal_off",
	after_destruct = piston_remove_pusher,
	node_box = piston_down_on_box,
	selection_box = piston_down_on_box,
	mesecons_piston = pistonspec_normal_down,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_off = piston_off,
		rules = piston_down_rules,
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- pusher
minetest.register_node("mesecons_pistons:piston_down_pusher_normal", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_pusher_back.png",
		"mesecons_piston_pusher_front.png",
		"mesecons_piston_pusher_left.png^[transformR90",
		"mesecons_piston_pusher_right.png^[transformR270",
		"mesecons_piston_pusher_bottom.png^[transformR180",
		"mesecons_piston_pusher_top.png",
		},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	after_destruct = piston_remove_base,
	diggable = false,
	corresponding_piston = "mesecons_pistons:piston_down_normal_on",
	selection_box = piston_down_pusher_box,
	node_box = piston_down_pusher_box,
	sounds = mcl_sounds.node_sound_wood_defaults(),
	_mcl_blast_resistance = 2.5,
	on_rotate = on_rotate,
})

-- Sticky

local pistonspec_sticky_down = {
	onname = "mesecons_pistons:piston_down_sticky_on",
	offname = "mesecons_pistons:piston_down_sticky_off",
	dir = {x = 0, y = -1, z = 0},
	pusher = "mesecons_pistons:piston_down_pusher_sticky",
	sticky = true
}

-- offstate
minetest.register_node("mesecons_pistons:piston_down_sticky_off", {
	tiles = {
		"mesecons_piston_back.png",
		"mesecons_piston_pusher_front_sticky.png",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_sticky_off",
	mesecons_piston = pistonspec_sticky_down,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_on = piston_on,
		rules = piston_down_rules,
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- onstate
minetest.register_node("mesecons_pistons:piston_down_sticky_on", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_back.png",
		"mesecons_piston_on_front.png",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		"mesecons_piston_bottom.png^[transformR180",
		},
	groups = {handy=1, not_in_creative_inventory = 1},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	drop = "mesecons_pistons:piston_sticky_off",
	after_destruct = piston_remove_pusher,
	node_box = piston_down_on_box,
	selection_box = piston_down_on_box,
	mesecons_piston = pistonspec_sticky_down,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	mesecons = {effector={
		action_off = piston_off,
		rules = piston_down_rules,
	}},
	_mcl_blast_resistance = 2.5,
	_mcl_hardness = 0.5,
	on_rotate = on_rotate,
})

-- pusher
minetest.register_node("mesecons_pistons:piston_down_pusher_sticky", {
	drawtype = "nodebox",
	tiles = {
		"mesecons_piston_pusher_back.png",
		"mesecons_piston_pusher_front_sticky.png",
		"mesecons_piston_pusher_left.png^[transformR90",
		"mesecons_piston_pusher_right.png^[transformR270",
		"mesecons_piston_pusher_bottom.png^[transformR180",
		"mesecons_piston_pusher_top.png",
		},
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	is_ground_content = false,
	after_destruct = piston_remove_base,
	diggable = false,
	corresponding_piston = "mesecons_pistons:piston_down_sticky_on",
	selection_box = piston_down_pusher_box,
	node_box = piston_down_pusher_box,
	sounds = mcl_sounds.node_sound_wood_defaults(),
	_mcl_blast_resistance = 2.5,
	on_rotate = on_rotate,
})


-- Register pushers as stoppers if they would be seperated from the piston
local piston_pusher_get_stopper = function (node, dir, stack, stackid)
	if (stack[stackid + 1]
	and stack[stackid + 1].node.name   == minetest.registered_nodes[node.name].corresponding_piston
	and stack[stackid + 1].node.param2 == node.param2)
	or (stack[stackid - 1]
	and stack[stackid - 1].node.name   == minetest.registered_nodes[node.name].corresponding_piston
	and stack[stackid - 1].node.param2 == node.param2) then
		return false
	end
	return true
end

local piston_pusher_up_down_get_stopper = function (node, dir, stack, stackid)
	if (stack[stackid + 1]
	and stack[stackid + 1].node.name   == minetest.registered_nodes[node.name].corresponding_piston)
	or (stack[stackid - 1]
	and stack[stackid - 1].node.name   == minetest.registered_nodes[node.name].corresponding_piston) then
		return false
	end
	return true
end

mesecon.register_mvps_stopper("mesecons_pistons:piston_pusher_normal", piston_pusher_get_stopper)
mesecon.register_mvps_stopper("mesecons_pistons:piston_pusher_sticky", piston_pusher_get_stopper)

mesecon.register_mvps_stopper("mesecons_pistons:piston_up_pusher_normal", piston_pusher_up_down_get_stopper)
mesecon.register_mvps_stopper("mesecons_pistons:piston_up_pusher_sticky", piston_pusher_up_down_get_stopper)

mesecon.register_mvps_stopper("mesecons_pistons:piston_down_pusher_normal", piston_pusher_up_down_get_stopper)
mesecon.register_mvps_stopper("mesecons_pistons:piston_down_pusher_sticky", piston_pusher_up_down_get_stopper)


-- Register pistons as stoppers if they would be seperated from the stopper
local piston_up_down_get_stopper = function (node, dir, stack, stackid)
	if (stack[stackid + 1]
	and stack[stackid + 1].node.name   == minetest.registered_nodes[node.name].mesecons_piston.pusher)
	or (stack[stackid - 1]
	and stack[stackid - 1].node.name   == minetest.registered_nodes[node.name].mesecons_piston.pusher) then
		return false
	end
	return true
end

local piston_get_stopper = function (node, dir, stack, stackid)
	local pistonspec = minetest.registered_nodes[node.name].mesecons_piston
	dir = piston_get_direction(pistonspec.dir, node)
	local pusherpos  = vector.add(stack[stackid].pos, dir)
	local pushernode = minetest.get_node(pusherpos)

	if minetest.registered_nodes[node.name].mesecons_piston.pusher == pushernode.name then
		for _, s in ipairs(stack) do
			if vector.equals(s.pos, pusherpos) -- pusher is also to be pushed
			and s.node.param2 == node.param2 then
				return false
			end
		end
	end
	return true
end

mesecon.register_mvps_stopper("mesecons_pistons:piston_normal_on", piston_get_stopper)
mesecon.register_mvps_stopper("mesecons_pistons:piston_sticky_on", piston_get_stopper)

mesecon.register_mvps_stopper("mesecons_pistons:piston_up_normal_on", piston_up_down_get_stopper)
mesecon.register_mvps_stopper("mesecons_pistons:piston_up_sticky_on", piston_up_down_get_stopper)

mesecon.register_mvps_stopper("mesecons_pistons:piston_down_normal_on", piston_up_down_get_stopper)
mesecon.register_mvps_stopper("mesecons_pistons:piston_down_sticky_on", piston_up_down_get_stopper)

--craft recipes
minetest.register_craft({
	output = 'mesecons_pistons:piston_normal_off',
	recipe = {
		{"group:wood", "group:wood", "group:wood"},
		{"mcl_core:cobble", "mcl_core:iron_ingot", "mcl_core:cobble"},
		{"mcl_core:cobble", "mesecons:redstone", "mcl_core:cobble"},
	}
})

minetest.register_craft({
	output = "mesecons_pistons:piston_sticky_off",
	recipe = {
		{"mcl_mobitems:slimeball"},
		{"mesecons_pistons:piston_normal_off"},
	}
})

-- Add entry aliases for the Help
if minetest.get_modpath("doc") then
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_normal_off", "nodes", "mesecons_pistons:piston_normal_on")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_normal_off", "nodes", "mesecons_pistons:piston_up_normal_off")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_normal_off", "nodes", "mesecons_pistons:piston_up_normal_on")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_normal_off", "nodes", "mesecons_pistons:piston_down_normal_off")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_normal_off", "nodes", "mesecons_pistons:piston_down_normal_on")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_normal_off", "nodes", "mesecons_pistons:piston_pusher_normal")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_normal_off", "nodes", "mesecons_pistons:piston_up_pusher_normal")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_normal_off", "nodes", "mesecons_pistons:piston_down_pusher_normal")

	doc.add_entry_alias("nodes", "mesecons_pistons:piston_sticky_off", "nodes", "mesecons_pistons:piston_sticky_on")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_sticky_off", "nodes", "mesecons_pistons:piston_up_sticky_off")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_sticky_off", "nodes", "mesecons_pistons:piston_up_sticky_on")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_sticky_off", "nodes", "mesecons_pistons:piston_down_sticky_off")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_sticky_off", "nodes", "mesecons_pistons:piston_down_sticky_on")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_sticky_off", "nodes", "mesecons_pistons:piston_pusher_sticky")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_sticky_off", "nodes", "mesecons_pistons:piston_up_pusher_sticky")
	doc.add_entry_alias("nodes", "mesecons_pistons:piston_sticky_off", "nodes", "mesecons_pistons:piston_down_pusher_sticky")
end