worldedit.marker1 = {}
worldedit.marker2 = {}
worldedit.marker_region = {}

--marks worldedit region position 1
worldedit.mark_pos1 = function(name)
	local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]

	if pos1 ~= nil then
		--make area stay loaded
		local manip = minetest.get_voxel_manip()
		manip:read_from_map(pos1, pos1)
	end
	if worldedit.marker1[name] ~= nil then --marker already exists
		worldedit.marker1[name]:remove() --remove marker
		worldedit.marker1[name] = nil
	end
	if pos1 ~= nil then
		--add marker
		worldedit.marker1[name] = minetest.add_entity(pos1, "worldedit:pos1")
		if worldedit.marker1[name] ~= nil then
			worldedit.marker1[name]:get_luaentity().name = name
		end
	end
	worldedit.mark_region(name)
end

--marks worldedit region position 2
worldedit.mark_pos2 = function(name)
	local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]

	if pos2 ~= nil then
		--make area stay loaded
		local manip = minetest.get_voxel_manip()
		manip:read_from_map(pos2, pos2)
	end
	if worldedit.marker2[name] ~= nil then --marker already exists
		worldedit.marker2[name]:remove() --remove marker
		worldedit.marker2[name] = nil
	end
	if pos2 ~= nil then
		--add marker
		worldedit.marker2[name] = minetest.add_entity(pos2, "worldedit:pos2")
		if worldedit.marker2[name] ~= nil then
			worldedit.marker2[name]:get_luaentity().name = name
		end
	end
	worldedit.mark_region(name)
end

worldedit.mark_region = function(name)
	local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]

	if worldedit.marker_region[name] ~= nil then --marker already exists
		--wip: make the area stay loaded somehow
		for _, entity in ipairs(worldedit.marker_region[name]) do
			entity:remove()
		end
		worldedit.marker_region[name] = nil
	end
	if pos1 ~= nil and pos2 ~= nil then
		local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
		local thickness = 0.2
		local sizex, sizey, sizez = (1 + pos2.x - pos1.x) / 2, (1 + pos2.y - pos1.y) / 2, (1 + pos2.z - pos1.z) / 2

		--make area stay loaded
		local manip = minetest.get_voxel_manip()
		manip:read_from_map(pos1, pos2)

		local markers = {}

		--XY plane markers
		for _, z in ipairs({pos1.z - 0.5, pos2.z + 0.5}) do
			local marker = minetest.add_entity({x=pos1.x + sizex - 0.5, y=pos1.y + sizey - 0.5, z=z}, "worldedit:region_cube")
			marker:set_properties({
				visual_size={x=sizex * 2, y=sizey * 2},
				collisionbox = {-sizex, -sizey, -thickness, sizex, sizey, thickness},
			})
			marker:get_luaentity().name = name
			table.insert(markers, marker)
		end

		--YZ plane markers
		for _, x in ipairs({pos1.x - 0.5, pos2.x + 0.5}) do
			local marker = minetest.add_entity({x=x, y=pos1.y + sizey - 0.5, z=pos1.z + sizez - 0.5}, "worldedit:region_cube")
			marker:set_properties({
				visual_size={x=sizez * 2, y=sizey * 2},
				collisionbox = {-thickness, -sizey, -sizez, thickness, sizey, sizez},
			})
			marker:setyaw(math.pi / 2)
			marker:get_luaentity().name = name
			table.insert(markers, marker)
		end

		worldedit.marker_region[name] = markers
	end
end

minetest.register_entity(":worldedit:pos1", {
	initial_properties = {
		visual = "cube",
		visual_size = {x=1.1, y=1.1},
		textures = {"worldedit_pos1.png", "worldedit_pos1.png",
			"worldedit_pos1.png", "worldedit_pos1.png",
			"worldedit_pos1.png", "worldedit_pos1.png"},
		collisionbox = {-0.55, -0.55, -0.55, 0.55, 0.55, 0.55},
		physical = false,
	},
	on_step = function(self, dtime)
		if worldedit.marker1[self.name] == nil then
			self.object:remove()
		end
	end,
	on_punch = function(self, hitter)
		self.object:remove()
		worldedit.marker1[self.name] = nil
	end,
})

minetest.register_entity(":worldedit:pos2", {
	initial_properties = {
		visual = "cube",
		visual_size = {x=1.1, y=1.1},
		textures = {"worldedit_pos2.png", "worldedit_pos2.png",
			"worldedit_pos2.png", "worldedit_pos2.png",
			"worldedit_pos2.png", "worldedit_pos2.png"},
		collisionbox = {-0.55, -0.55, -0.55, 0.55, 0.55, 0.55},
		physical = false,
	},
	on_step = function(self, dtime)
		if worldedit.marker2[self.name] == nil then
			self.object:remove()
		end
	end,
	on_punch = function(self, hitter)
		self.object:remove()
		worldedit.marker2[self.name] = nil
	end,
})

minetest.register_entity(":worldedit:region_cube", {
	initial_properties = {
		visual = "upright_sprite",
		visual_size = {x=1.1, y=1.1},
		textures = {"worldedit_cube.png"},
		visual_size = {x=10, y=10},
		physical = false,
	},
	on_step = function(self, dtime)
		if worldedit.marker_region[self.name] == nil then
			self.object:remove()
			return
		end
	end,
	on_punch = function(self, hitter)
		for _, entity in ipairs(worldedit.marker_region[self.name]) do
			entity:remove()
		end
		worldedit.marker_region[self.name] = nil
	end,
})