--[[
Copyright (c) 2014, Robert 'Bobby' Zenz
All rights reserved.

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modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
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  this list of conditions and the following disclaimer in the documentation
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--]]


--- Various functions and constants for working with the wallmounted
-- value.
wallmountedutil = {
	--- Attached to the node in the negative x direction.
	NEGATIVE_X = 3,
	
	--- Attached to the node in the negative y direction.
	NEGATIVE_Y = 1,
	
	--- Attached to the node in the negative z direction.
	NEGATIVE_Z = 5,
	
	--- The vector for the negative x direction.
	NEGATIVE_X_VECTOR = {
		x = -1,
		y = 0,
		z = 0
	},
	
	--- The vector for the negative y direction.
	NEGATIVE_Y_VECTOR = {
		x = 0,
		y = -1,
		z = 0
	},
	
	--- The vector for the negative z direction.
	NEGATIVE_Z_VECTOR = {
		x = 0,
		y = 0,
		z = -1
	},
	
	--- Attached to the node in the positive y direction.
	POSITIVE_X = 2,
	
	--- Attached to the node in the positive y direction.
	POSITIVE_Y = 0,
	
	--- Attached to the node in the positive y direction.
	POSITIVE_Z = 4,
	
	--- The vector for the positive x direction.
	POSITIVE_X_VECTOR = {
		x = 1,
		y = 0,
		z = 0
	},
	
	--- The vector for the positive y direction.
	POSITIVE_Y_VECTOR = {
		x = 0,
		y = 1,
		z = 0
	},
	
	--- The vector for the positive z direction.
	POSITIVE_Z_VECTOR = {
		x = 0,
		y = 0,
		z = 1
	}
}


--- Gets the vector for the given ID.
--
-- @param id The ID for which to get the vector.
-- @return The vector for the given ID.
function wallmountedutil.get_vector(id)
	if id == wallmountedutil.NEGATIVE_X then
		return wallmountedutil.NEGATIVE_X_VECTOR
	elseif id == wallmountedutil.NEGATIVE_Y then
		return wallmountedutil.NEGATIVE_Y_VECTOR
	elseif id == wallmountedutil.NEGATIVE_Z then
		return wallmountedutil.NEGATIVE_Z_VECTOR
	elseif id == wallmountedutil.POSITIVE_X then
		return wallmountedutil.POSITIVE_X_VECTOR
	elseif id == wallmountedutil.POSITIVE_Y then
		return wallmountedutil.POSITIVE_Y_VECTOR
	elseif id == wallmountedutil.POSITIVE_Z then
		return wallmountedutil.POSITIVE_Z_VECTOR
	end
	
	return wallmountedutil.NEGATIVE_Y_VECTOR
end

--- Gets the corresponding facedir value for the given wallmounted value.
--
-- @param wallmounted_id The wallmounted value/ID.
-- @return The facedir value/ID.
function wallmountedutil.to_facedir(wallmounted_id)
	if wallmounted_id == wallmountedutil.NEGATIVE_X then
		return facedirutil.NEGATIVE_X
	elseif wallmounted_id == wallmountedutil.NEGATIVE_Z then
		return facedirutil.NEGATIVE_Z
	elseif wallmounted_id == wallmountedutil.POSITIVE_X then
		return facedirutil.POSITIVE_X
	elseif wallmounted_id == wallmountedutil.POSITIVE_Z then
		return facedirutil.POSITIVE_Z
	end
	
	return facedirutil.POSITIVE_X
end