-- minimum amount of time between two LootLink scans of the auction house (1 hour = 3600 seconds)
LOOTLINK_TIME_BETWEEN_AUCTION_SCANS = 3600;

-- prevents the user from seeing what the LootLink does at the Auction House
LootLink_Auction_Browsing = false;

-- whether we're done getting links with the current page (perhaps not necessary, but I don't know if OnUpdate is ran in its own thread...)
LootLink_Auction_DoneWithCurrentPage = true;

LootLink_Auction_CurrentPage = 0;
LootLink_Auction_TimeSinceLastScan = 0;

LootLink_Saved_AuctionFrame_OnShow = nil;
LootLink_Saved_AuctionFrameBrowse_OnEvent = nil;
LootLink_Saved_CanSendAuctionQuery = nil;

function LootLink_Auction_StartScan()
	LootLink_Auction_TimeSinceLastScan = GetTime();
	LootLink_Auction_DoneWithCurrentPage = true;
	LootLink_GetAllAuctionItems();
end

function LootLink_AuctionFrame_HookFunctions()
	if ( not LootLink_Saved_AuctionFrame_OnShow ) then
		LootLink_Saved_AuctionFrame_OnShow = AuctionFrame_OnShow;
		AuctionFrame_OnShow = LootLink_AuctionFrame_OnShow;
	end
	if ( not LootLink_Saved_AuctionFrameBrowse_OnEvent ) then
		LootLink_Saved_AuctionFrameBrowse_OnEvent = AuctionFrameBrowse_OnEvent;
		AuctionFrameBrowse_OnEvent = LootLink_AuctionFrameBrowse_OnEvent;
	end
	if ( not LootLink_Saved_CanSendAuctionQuery ) then
		LootLink_Saved_CanSendAuctionQuery = CanSendAuctionQuery;
		CanSendAuctionQuery = LootLink_CanSendAuctionQuery;
	end
end

-- this is called in the BrowseSearchButton:OnUpdate handler which is why it works
function LootLink_CanSendAuctionQuery()
	local value = LootLink_Saved_CanSendAuctionQuery();
	if ( LootLink_Auction_Browsing ) then
		if ( (value) and ( LootLink_Auction_DoneWithCurrentPage ) ) then
			LootLink_GetNextAuctionPage();
		end
		return false;
	else
		return value;
	end
end

-- hides the search results while scanning is going on
function LootLink_AuctionFrameBrowse_OnEvent()
	LootLink_GetAllCurrentBrowsedItems();
	if ( not LootLink_Auction_Browsing ) then
		LootLink_Saved_AuctionFrameBrowse_OnEvent();
	end
end

function LootLink_GetAllCurrentBrowsedItems()
	local numBatchAuctions, totalAuctions = GetNumAuctionItems("list");
	local link = nil;
	for i = 1, numBatchAuctions do
		link = GetAuctionItemLink("list", i);
		if ( link ) then
			LootLink_ProcessLinks(link);
		end
	end
	LootLink_Auction_DoneWithCurrentPage = true;
end

function LootLink_GetNextAuctionPage()
	if ( LootLink_Auction_Browsing ) then
		if ( not AuctionFrame:IsVisible() ) then
			LootLink_Auction_Browsing = false;
			return;
		end
		local numBatchAuctions, totalAuctions = GetNumAuctionItems("list");
		
		local numberOfPages = floor(totalAuctions / NUM_AUCTION_ITEMS_PER_PAGE);
		
		if ( LootLink_Auction_CurrentPage < numberOfPages ) then
			LootLink_Auction_CurrentPage = LootLink_Auction_CurrentPage + 1;
			LootLink_Auction_DoneWithCurrentPage = true;
			QueryAuctionItems("", "", "", nil, nil, nil, LootLink_Auction_CurrentPage, false, nil);
			if ( LootLink_Auction_CurrentPage == 0 ) then
				BrowseNoResultsText:SetText("LootLink is searching for new items in the auction house, please be patient.");
			else
				BrowseNoResultsText:SetText(format("LootLink is currently searching page %d/%d, please be patient.", LootLink_Auction_CurrentPage+1, numberOfPages+1));
			end
			LootLink_Auction_DoneWithCurrentPage = false;
		else
			BrowseNoResultsText:SetText("LootLink has finished searching - thank you for your patience.");
			LootLink_Auction_Browsing = false;
		end
	else
		LootLink_Auction_DoneWithCurrentPage = true;
	end
end

function LootLink_GetAllAuctionItems()
	LootLink_Auction_Browsing = true;
	LootLink_Auction_CurrentPage = -1;
end

function LootLink_AuctionFrame_OnShow()
	local curTime = GetTime();
	if ( ( LootLink_Auction_TimeSinceLastScan == 0 ) or 
		( ( LootLink_Auction_TimeSinceLastScan + LOOTLINK_TIME_BETWEEN_AUCTION_SCANS ) < curTime ) ) then
		LootLink_Auction_StartScan();
	end
	LootLink_Saved_AuctionFrame_OnShow();
end