local Inv = { }
Inv.Items = { }
Inv.Space = 30
Inv.UsedSpace = 0
local SelectedItem = nil
local DermaList

function OpenInventory()
    SelectedItem = nil
    local DermaPanel = vgui.Create( "DFrame" )
    DermaPanel:SetPos( 50,50 )
    DermaPanel:SetSize( 600, 500 )
    DermaPanel:SetTitle( "Your Inventory" )
    DermaPanel:SetVisible( true )
    DermaPanel:SetDraggable( true )
    DermaPanel:ShowCloseButton( true )
    DermaPanel:MakePopup()
    DermaPanel.PaintOver = function()
        draw.SimpleText("Space: "..Inv.UsedSpace.."/"..Inv.Space,"Trebuchet19",500,460,Color(255,255,255,255))
        draw.SimpleText("Selected:","Trebuchet19",230,460,Color(255,255,255,255))
        if SelectedItem then
            draw.SimpleText("\""..string.upper(SelectedItem.name).."\"","Trebuchet19",295,460,Color(255,255,255,255))
        end
    end


    DermaList = vgui.Create( "DPanelList", DermaPanel )
    DermaList:SetPos( 5,25 )
    DermaList:SetSize( 590, 420 )
    DermaList:SetSpacing( 2 )
    DermaList:SetPadding( 4 )
    DermaList:EnableHorizontal( true )
    DermaList:EnableVerticalScrollbar( true )

    local UseButton = vgui.Create( "DButton" )
    UseButton:SetParent( DermaPanel )
    UseButton:SetText( "Use" )
    UseButton:SetPos( 10, 460 )
    UseButton:SetSize( 100, 25 )
    UseButton.DoClick = function ()
        surface.PlaySound( "ui/buttonclickrelease.wav" )
        RefreshList()
    end

    local DropButton = vgui.Create( "DButton" )
    DropButton:SetParent( DermaPanel )
    DropButton:SetText( "Drop" )
    DropButton:SetPos( 120, 460 )
    DropButton:SetSize( 100, 25 )
    DropButton.DoClick = function ()
        surface.PlaySound( "ui/buttonclickrelease.wav" )
        RefreshList()
    end

    RefreshList()

end
concommand.Add("OpenInventory", OpenInventory)

function AddItem(data)
    local item = data:ReadString()
    local mdl = data:ReadString()
    local amount = data:ReadLong()
    if amount == nil then amount = 0 end

    table.insert(Inv.Items,{item = item, mdl = mdl, amount = amount})
end

function RefreshSpace()
    local a = 0
    for k, v in pairs(Inv.Items) do
        a = a + v.amount
    end
    Inv.UsedSpace = a
end

function RefreshList()
    for k, v in pairs(DermaList:GetItems()) do
        DermaList:RemoveItem(v)
    end
    for k, v in pairs(Inv.Items) do
        local icon = vgui.Create( "SpawnIcon", IconList )
        icon.item = v.item
        icon.name = FixName(v.item)
        icon.amount = v.amount
        icon:SetModel( v.mdl )
        icon:SetToolTip( icon.name )
        DermaList:AddItem( icon )
        icon.DoClick = function( icon )
            surface.PlaySound( "ui/buttonclickrelease.wav" )
            SelectedItem = icon
        end
        icon.PaintOver = function( icon )
            draw.SimpleText(icon.amount,"Trebuchet18",48,2,Color(255,255,255,255))
        end
    end
    DermaList:Rebuild()
    RefreshSpace()
end

function FixName(name)
    local name = string.Explode("_", name)
    return string.Implode(" ", name)
end

table.insert(Inv.Items,{item = "money_printer", mdl = "models/props_c17/consolebox03a.mdl", amount = 30})