returnmirror = {}
returnmirror.cost_teleport = 200
returnmirror.cost_set = 20

if tonumber(minetest.setting_get("returnmirror_cost_teleport")) ~= nil then
	returnmirror.cost_teleport = tonumber(minetest.setting_get("returnmirror_cost_teleport"))
end
if tonumber(minetest.setting_get("returnmirror_cost_set")) ~= nil then
	returnmirror.cost_set = tonumber(minetest.setting_get("returnmirror_cost_set"))
end

if minetest.get_modpath("mana") ~= nil then
	returnmirror.mana = true
else
	returnmirror.mana = false
end

returnmirror.mana_check = function(player, cost)
	local allowed
	if returnmirror.mana then
		if mana.subtract(player:get_player_name(), cost) then
			allowed = true
		else
			allowed = false
		end
	else
		allowed = true
	end
	return allowed
end

returnmirror.set_position_inactive = function(itemstack, user, pointed_thing)
	if returnmirror.mana_check(user, returnmirror.cost_set) then
		local pos = user:getpos()
		local newitem = ItemStack("returnmirror:mirror_active")
		newitem:set_metadata(minetest.pos_to_string(pos))
		minetest.sound_play( {name="returnmirror_set", gain=1}, {pos=pos, max_hear_distance=12})
		return newitem
	else
		minetest.sound_play( {name="returnmirror_fail", gain=1}, {pos=pos, max_hear_distance=18})
	end
end

returnmirror.set_position_active = function(itemstack, user, pointed_thing)
	if returnmirror.mana_check(user, returnmirror.cost_set) then
		local pos = user:getpos()
		itemstack:set_metadata(minetest.pos_to_string(pos))
		minetest.sound_play( {name="returnmirror_set", gain=1}, {pos=pos, max_hear_distance=12})
		return itemstack
	else
		minetest.sound_play( {name="returnmirror_fail", gain=1}, {pos=pos, max_hear_distance=18})
	end
end

minetest.register_tool("returnmirror:mirror_inactive", {
	description = "Mirror of Returning",
	inventory_image = "returnmirror_mirror_inactive.png",
	wield_image = "returnmirror_mirror_inactive.png",
	tool_capabilities = {},
	range = 0,
	on_use = function(itemstack, user, pointed_thing)
		minetest.sound_play( {name="returnmirror_fail", gain=1}, {pos=user:getpos(), max_hear_distance=18})
	end,
	on_place = returnmirror.set_position_inactive,
	on_secondary_use = returnmirror.set_position_inactive,
})

minetest.register_tool("returnmirror:mirror_active", {
	description = "Mirror of Returning",
	stack_max = 1,
	inventory_image = "returnmirror_mirror_active.png",
	wield_image = "returnmirror_mirror_active.png",
	tool_capabilities = {},
	range = 0,
	on_use = function(itemstack, user, pointed_thing)
		local dest_string = itemstack:get_metadata()
		local dest = minetest.string_to_pos(dest_string)
		local fail = true
		if dest ~= nil then
			if returnmirror.mana_check(user, returnmirror.cost_teleport) then
				fail = false
				local src = user:getpos()
				minetest.sound_play( {name="returnmirror_teleport", gain=1}, {pos=src, max_hear_distance=30})
				minetest.add_particlespawner({
					amount = 50,
					time = 0.1,
					minpos = {x=src.x-0.4, y=src.y+0.25, z=src.z-0.4},
					maxpos = {x=src.x+0.4, y=src.y+0.75, z=src.z+0.4},
					minvel = {x=-0.2, y=-0.2, z=-0.2},
					maxvel = {x=0.2, y=0.2, z=0.2},
					minexptime=3,
					maxexptime=4.5,
					minsize=1,
					maxsize=1.25,
					texture = "returnmirror_particle_departure.png",
				})
				user:setpos(dest)
				minetest.sound_play( {name="returnmirror_teleport", gain=1}, {pos=dest, max_hear_distance=30})
				minetest.add_particlespawner({
					amount = 100,
					time = 0.1,
					minpos = {x=dest.x-0.4, y=dest.y+0.25, z=dest.z-0.4},
					maxpos = {x=dest.x+0.4, y=dest.y+0.75, z=dest.z+0.4},
					minvel = {x=-0.4, y=-0.3, z=-0.4},
					maxvel = {x=0.4, y=0.3, z=0.4},
					minexptime=6,
					maxexptime=12,
					minsize=1,
					maxsize=1.25,
					texture = "returnmirror_particle_arrival.png",
				})
			end
		end
		if fail then
			minetest.sound_play( {name="returnmirror_fail", gain=1}, {pos=pos, max_hear_distance=18})
		end
	end,
	on_place = returnmirror.set_position_active,
	on_secondary_use = returnmirror.set_position_active,
	groups = { not_in_creative_inventory = 1 },
})

minetest.register_alias("returnmirror:mirror_inactive", "returnmirror:returnmirror")

if minetest.get_modpath("doc_items") ~= nil then
	local longdesc, usagehelp
	usagehelp = "Rightclick to set the mirror's teleport location. Leftclick to immediately teleport back to the mirror's teleport location."
	if minetest.get_modpath("mana") ~= nil then
		longdesc ="This item allows to teleport the user back to a previously set location, at the cost of mana."
		usagehelp = usagehelp .. " " .. string.format("Setting the teleport location costs %d mana, teleporting costs %d mana.", returnmirror.cost_set, returnmirror.cost_teleport)
	else
		longdesc = "This item allows to teleport its user back to a previously set location."
	end

	doc.sub.items.set_items_longdesc({
		["returnmirror:mirror_inactive"] = longdesc,
	})
	doc.sub.items.set_items_usagehelp({
		["returnmirror:mirror_inactive"] = usagehelp
	})

	doc.add_entry_alias("tools", "returnmirror:mirror_inactive", "returnmirror:mirror_active")
end