--[[
    cargBags: An inventory framework addon for World of Warcraft

    Copyright (C) 2010  Constantin "Cargor" Schomburg <xconstruct@gmail.com>

    cargBags is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    cargBags is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with cargBags; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

DESCRIPTION
    Item keys for the Blizz equipment sets

DEPENDENCIES
    mixins-add/itemkeys/basic.lua
]]
local _, ns = ...
local cargBags = ns.cargBags

local ItemKeys = cargBags.itemKeys

local setItems, isUpdating

local function initUpdater()
    local function updateSets()
        if isUpdating then return end
        isUpdating = true

        setItems = setItems or {}
        wipe(setItems)

        for setID = 0, C_EquipmentSet.GetNumEquipmentSets() do
            local locations = C_EquipmentSet.GetItemLocations(setID)
            if locations then
                for _, location in pairs(locations) do
                    local _, bank, bags, _, slot, bag = EquipmentManager_UnpackLocation(location)
                    if (bank or bags) and slot and bag then
                        setItems[bag..":"..slot] = true
                    end
                end
            end
        end

        isUpdating = nil
    end

    local updater = CreateFrame("Frame")
    updater:RegisterEvent("BAG_UPDATE")
    updater:RegisterEvent("EQUIPMENT_SETS_CHANGED")
    updater:RegisterEvent("PLAYER_EQUIPMENT_CHANGED")
    updater:SetScript("OnEvent", updateSets)

    updateSets()
end

ItemKeys["isItemSet"] = function(item)
    if not setItems then initUpdater() end
    return setItems[item.bagId..":"..item.slotId]
end
