TOOL.Category = "Render"
TOOL.Name = "One Way Prop"
TOOL.Command = nil
TOOL.ConfigName = ""
local MAX_ONEWAY_PROPS_PER_PLAYER = 5
if CLIENT then
    language.Add("Tool.onewayprop.name", "One Way Prop")
    language.Add("Tool.onewayprop.desc", "Make a prop transparent from one side, but not from the other.")
    language.Add("Tool.onewayprop.0", "Left-click to make the prop transparent from the front, right-click to make it transparent from the back.")

    function TOOL.BuildCPanel(panel)
        panel:AddControl("Header", {Text = "One Way Prop", Description = "Make a prop transparent from one side, but not from the other."})
    end
end

function TOOL:LeftClick(trace)
    if CLIENT then return true end
    if not self:CheckLimit() then return false end
    if self:GetOwner():GetNWInt("onewayprop_count", 0) >= MAX_ONEWAY_PROPS_PER_PLAYER then
        self:GetOwner():ChatPrint("You have reached the maximum number of one-way props allowed.")
        return false
    end
    if not trace.HitNonWorld then return false end

    local ent = trace.Entity
    if not IsValid(ent) then return false end
    if CLIENT then return true end

    if not self:GetSWEP():CheckLimit("onewayprops") then return false end

    local ang = trace.HitNormal:Angle()
    ang:RotateAroundAxis(ang:Right(), -90)

    local onewayprop = ents.Create("prop_physics")
    onewayprop:SetModel(ent:GetModel())
    onewayprop:SetPos(trace.HitPos)
    onewayprop:SetAngles(ang)
    onewayprop:Spawn()

    ent:SetNoDraw(true)

    constraint.Weld(ent, onewayprop, 0, 0, 0, true)

    undo.Create("One Way Prop")
    undo.AddEntity(onewayprop)
    undo.AddEntity(ent)
    undo.SetPlayer(self:GetOwner())
    undo.Finish()

    self:GetOwner():AddCleanup("onewayprops", onewayprop)
    self:GetOwner():AddCleanup("onewayprops", ent)

    return true
end

function TOOL:RightClick(trace)
	if not trace.HitNonWorld then return false end
	local ent = trace.Entity
if not IsValid(ent) then return false end
if CLIENT then return true end

if not self:GetSWEP():CheckLimit("onewayprops") then return false end

local ang = trace.HitNormal:Angle()
ang:RotateAroundAxis(ang:Right(), 90)

local onewayprop = ents.Create("prop_physics")
onewayprop:SetModel(ent:GetModel())
onewayprop:SetPos(trace.HitPos)
onewayprop:SetAngles(ang)
onewayprop:Spawn()

ent:SetNoDraw(true)

constraint.Weld(ent, onewayprop, 0, 0, 0, true)

-- Set the render mode of the onewayprop to "rendering only one way" (13) to make it transparent from one side only.
onewayprop:SetRenderMode(RENDERMODE_TRANSCOLOR)
onewayprop:SetKeyValue("renderamt", "0")
onewayprop:SetKeyValue("rendercolor", "255 255 255")

undo.Create("One Way Prop")
undo.AddEntity(onewayprop)
undo.AddEntity(ent)
undo.SetPlayer(self:GetOwner())
undo.Finish()

self:GetOwner():AddCleanup("onewayprops", onewayprop)
self:GetOwner():AddCleanup("onewayprops", ent)

return true
end

function TOOL:PostEntityPaste(ply, ent, created_entities)
if CLIENT then return end
if not IsValid(ply) or not ply:IsPlayer() then return end
local count = ply:GetNWInt("onewayprop_count", 0)
ply:SetNWInt("onewayprop_count", count + 1)
end

function TOOL:Holster()
if CLIENT then return end
if not IsValid(self:GetOwner()) or not self:GetOwner():IsPlayer() then return end
local count = self:GetOwner():GetNWInt("onewayprop_count", 0)
self:GetOwner():SetNWInt("onewayprop_count", count - 1)
end

function TOOL:Reload(trace)
if not trace.HitNonWorld then return false end
local ent = trace.Entity
if not IsValid(ent) then return false end
if CLIENT then return true end

if not ent:GetNoDraw() then return false end

local onewayprop = constraint.GetAllConstrainedEntities(ent)[2]
if not IsValid(onewayprop) then return false end

onewayprop:Remove()

ent:SetNoDraw(false)

undo.Create("One Way Prop")
undo.AddEntity(ent)
undo.SetPlayer(self:GetOwner())
undo.Finish()

self:GetOwner():AddCleanup("onewayprops", ent)

return true
end

-- Add the tool to the spawn menu
if CLIENT then
language.Add("Tool.onewayprop.name", "One Way Prop")
language.Add("Tool.onewayprop.desc", "Make a prop transparent from one side, but not from the other.")
language.Add("Tool.onewayprop.0", "Left-click to make the prop transparent from the front, right-click to make it transparent from the back.")
function TOOL.BuildCPanel(panel)
    panel:AddControl("Header", {Text = "One Way Prop", Description = "Make a prop transparent from one side, but not from the other."})
end
end