--
-- Copyright (C) 2010 - 2015 Eluna Lua Engine <http://emudevs.com/>
-- This program is free software licensed under GPL version 3
-- Please see the included DOCS/LICENSE.md for more information
--

-- filename.ext files are loaded before normal .lua files

local variableStores = {
    Player = {},
    Creature = {},
    GameObject = {},
}

local function DestroyData(event, obj)
    if event == 18 or event == 17 then
        local map = obj:GetMapId()
        local inst = obj:GetInstanceId()
        for k,v in pairs(variableStores) do
            if inst == 0 then
                v[map] = nil
            else
                local mapdata = v[map]
                if mapdata then
                    mapdata[inst] = nil
                end
            end
        end
        return
    end
    local mapdata = variableStores[obj:GetObjectType()][obj:GetMapId()]
    if mapdata then
        local instancedata = mapdata[obj:GetInstanceId()]
        if instancedata then
            instancedata[obj:GetGUIDLow()] = nil
        end
    end
end

local function GetData(self, field)
    local varStore = variableStores[self:GetObjectType()]
    local guid = self:GetGUIDLow()
    local map = self:GetMapId()
    local inst = self:GetInstanceId()

    varStore[map] = varStore[map] or {}
    varStore[map][inst] = varStore[map][inst] or {}
    varStore[map][inst][guid] = varStore[map][inst][guid] or {}

    if field then
        return varStore[map][inst][guid][field]
    else
        return varStore[map][inst][guid]
    end
end

local function SetData(self, field, val)
    local varStore = variableStores[self:GetObjectType()]
    local guid = self:GetGUIDLow()
    local map = self:GetMapId()
    local inst = self:GetInstanceId()

    varStore[map] = varStore[map] or {}
    varStore[map][inst] = varStore[map][inst] or {}
    varStore[map][inst][guid] = varStore[map][inst][guid] or {}
    
    varStore[map][inst][guid][field] = val
end

for k,v in pairs(variableStores) do
    _G[k].GetData = GetData
    _G[k].SetData = SetData
end

RegisterPlayerEvent(3, DestroyData) -- login
RegisterPlayerEvent(4, DestroyData) -- logout
RegisterServerEvent(31, DestroyData) -- creature delete
RegisterServerEvent(32, DestroyData) -- gameobject delete
RegisterServerEvent(17, DestroyData) -- map create
RegisterServerEvent(18, DestroyData) -- map destroy