mmp.defs = {
  current = {}
}
mmp.defs.add = function()
    local def = gmcp.Char.Defences.Add.name
    if not mmp.defs.current[def] then
        mmp.defs.current[def] = true
        raiseEvent("mmp got def", def)
    end
end


mmp.defs.remove = function()
    for _, def in ipairs(gmcp.Char.Defences.Remove) do
        mmp.defs.current[def] = nil
        raiseEvent("mmp lost def", def)
    end
end


mmp.defs.list = function()
    local newDefs = {}
    local addedDefs, lostDefs = {}, {}
    for _, v in ipairs(gmcp.Char.Defences.List) do
        newDefs[v.name] = true
        if not mmp.defs.current[v.name] then
            addedDefs[#addedDefs + 1] = v.name
        end
    end
    for def in pairs(mmp.defs.current) do
        if not newDefs[def] then
            lostDefs[#lostDefs + 1] = def
        end
    end
    mmp.defs.current = newDefs
    for _,def in pairs(lostDefs) do
        raiseEvent("mmp lost def", def)
    end
    for _,def in ipairs(addedDefs) do
        raiseEvent("mmp got def", def)
    end
end


-- EVENT HANDLERS
registerAnonymousEventHandler("gmcp.Char.Defences.Add", "mmp.defs.add")
registerAnonymousEventHandler("gmcp.Char.Defences.Remove", "mmp.defs.remove")
registerAnonymousEventHandler("gmcp.Char.Defences.List", "mmp.defs.list")