local glm = honey.glm

local vec3 = {}
setmetatable(vec3, {__index=_G})
setfenv(1, vec3)


Vec3 = {}

function Vec3.new(_, values)
	local self = {}
	self.data = glm.vec3_create()
	setmetatable(self, Vec3)
	if values then
		self[1] = values[1]
		self[2] = values[2]
		self[3] = values[3]
	end
	return self
end
setmetatable(Vec3, {__call=Vec3.new})


function Vec3.__index(self, key)
	if type(key) == 'number' then
		return glm.vec3_get(self.data, key-1)
	else
		return Vec3[key]
	end
end


function Vec3.__newindex(self, key, value)
	glm.vec3_set(self.data, key-1, value)
end


function Vec3.__tostring(self)
	return string.format("[%.4f, %.4f, %.4f]", self[1], self[2], self[3])
end


--===== arithmetic =====--

local function swapIfNumber(self, other)
	if type(self) == "number" and type(other) == "table" then
		return other, self
	else
		return self, other
	end
end


function Vec3.__add(self, other)
	local self, other = swapIfNumber(self, other)

	local dest = Vec3()
	if type(other) == "number" then
		glm.vec3_adds(self.data, other, dest.data)
	elseif type(other) == "table" then
		glm.vec3_add(self.data, other.data, dest.data)
	else
		error(string.format("cannot add %s to Vec3", type(other)))
	end
	return dest
end


function Vec3.__sub(self, other)
	local dest = Vec3()
	if type(other) == "number" then
		glm.vec3_subs(self.data, other, dest.data)
	elseif type(other) == "table" then
		glm.vec3_sub(self.data, other.data, dest.data)
	else
		error(string.format("cannot subtract %s from Vec3", type(other)))
	end
	return dest
end


function Vec3.__mul(self, other)
	local self, other = swapIfNumber(self, other)
	local dest = Vec3()
	if type(other) == "number" then
		glm.vec3_scale(self.data, other, dest.data)
	elseif type(other) == "table" then
		glm.vec3_mul(self.data, other.data, dest.data)
	else
		error(string.format("cannot multiply %s and Vec3", type(other)))
	end
	return dest
end


function Vec3.__div(self, other)
	local dest = Vec3()
	if type(other) == "number" then
		glm.vec3_divs(self.data, other, dest.data)
	elseif type(other) == "table" then
		glm.vec3_div(self.data, other.data, dest.data)
	else
		error(string.format("cannot divide Vec3 by %s", type(other)))
	end
	return dest
end




function Vec3.copyTo(self, dest)
	glm.vec3_copy(self.data, dest.data)
end


function Vec3.zero(self)
	glm.vec3_zero(self.data)
end


function Vec3.zero(self)
	glm.vec3_zero(self.data)
end
function Vec3.one(self)
	glm.vec3_one(self.data)
end


function Vec3.dot(self, other)
	return glm.vec3_dot(self.data, other.data)
end


function Vec3.crossTo(self, other, dest)
	glm.vec3_cross(self.data, other.data, dest.data)
end
function Vec3.cross(self, other)
	local dest = Vec3()
	self:crossTo(other, dest)
	return dest
end


function Vec3.crossnTo(self, other, dest)
	glm.vec3_crossn(self.data, other.data, dest.data)
end
function Vec3.crossn(self, other)
	local dest = Vec3()
	self:crossTo(other, dest)
	return dest
end


function Vec3.norm2(self)
	return glm.vec3_norm2(self.data)
end
function Vec3.norm(self)
	return glm.vec3_norm(self.data)
end


function Vec3.normalize(self)
	glm.vec3_normalize(self.data)
end
function Vec3.normalizeTo(self, dest)
	glm.vec3_normalize_to(self.data, dest.data)
end


return vec3.Vec3