local p = {}
local cargo= mw.ext.cargo

function p.main(frame, searchtype, fieldsin)
	local name
	local fields = fieldsin or 'JoinKey=Page, DisplayName, PlainName, COALESCE(Image, DisplayChar)=Display'
	local namespaces = '(_pageNamespace="0" OR _pageNamespace="10002")'
	searchtype = searchtype or 'PlainName'
	name = mw.text.trim(frame)
	local wherestr = ''

	if (searchtype == 'PlainName') then
		wherestr = ' AND PlainName="' .. name:gsub("'", "\'") .. '"'
	elseif (searchtype == 'ObjectID') then
		wherestr = ' AND BINARY ObjectID="' .. name:gsub("'", "\'") .. '"'
	elseif (searchtype == '_pageName') then
		wherestr = ' AND _pageName="' .. name:gsub("'", "\'") .. '"'
	end

	local result = cargo.query('GeneralData', fields, 
							   {where=namespaces .. wherestr,
								default=name,
								orderBy='_pageNamespace ASC'} )
	local resulttrue = 0

--[If there was no result, search by alias instead]
	if not next(result) then
		if searchtype == 'PlainName' then
    		wherestr = ' AND Aliases HOLDS "' .. name:gsub("'", "\'") .. '"'
		elseif searchtype == 'ObjectID' then
    		wherestr = ' AND IDAliases HOLDS "' .. name:gsub("'", "\'") .. '"'
		end 
		result = cargo.query('GeneralData', fields,
							 {where=namespaces .. wherestr,
							  default=name,
							  orderBy='_pageNamespace ASC'} )
		if next(result) then 
    		resulttrue = 1
		end
	else
		resulttrue = 1
	end
	-- If there was a result, check if there were more than two found objects.
	if resulttrue == 1 then
		if #result > 1 and searchtype == 'ObjectID' then
			error("There was more than one result with the name " .. name .. "![[Category:pages with favilink errors]]")
		end
		return result[1]
	else
		return nil
	end
end

function p.favilink(frame, searchtype)
	return p.main(frame, searchtype, '_pageName=Page, DisplayName, Image, DisplayChar, PlainName, COALESCE(Image, DisplayChar)=Display')
end

function p.IDtoname(frame)
	local name = frame
	if frame.args ~= nil then
    	name = frame.args[1]
	end
	local result = p.main(name, 'ObjectID', 'PlainName')
	if result == nil then
    	return name .. '(no results)]][[Category:Pages with ID to Name errors'
	elseif not next(result) then
    	return name .. '(no results)]][[Category:Pages with ID to Name errors'
	else 
    	return result['PlainName']
	end
end

function p.IDtopage(frame)
	local name = frame
	if frame.args ~= nil then
    	name = frame.args[1]
    	overridelink = frame.args[2] and frame.args[2] == "overridelink" or False
	end
	local result = p.main(name, 'ObjectID', '_pageName=Page,PlainName')
	if result == nil then
    	return name .. '(no results)]][[Category:Pages with ID to Page errors'
	elseif not next(result) then
    	return name .. '(no results)]][[Category:Pages with ID to Page errors'
	else 
		pagename = result['Page']
		plainname = result['PlainName']
		if string.lower(plainname) == string.lower(pagename) or not overridelink then
			return pagename
		end
		-- otherwise, use plainname for stuff like cybernetics credit wedge 2ยข
		return result['Page'] .. '|' .. result['PlainName']
	end
end

return p