-- Module:Wikibase
local p = {}

-- copiado de ca.wiki
-- Return the item ID of the item connected to the current page or connected to a page title via a sitelink.
-- mw.wikibase.getEntityIdForCurrentPage, mw.wikibase.getEntityIdForTitle
function p.id(frame)
	local page_title = frame.args[1] and mw.text.trim(frame.args[1])
	if page_title == nil or page_title == '' then
		return mw.wikibase.getEntityIdForCurrentPage()
	end
	return mw.wikibase.getEntityIdForTitle(page_title)
end

-- Devolve a etiqueta dun ítem dado.
function p.etiqueta(frame)
        if frame.args[1] == nil then
            entity = mw.wikibase.getEntityObject()
            if not entity then return nil end
 
            id = entity.id
        else
            id = frame.args[1]
        end
 
        return mw.wikibase.label( id )
end

-- copiado de ca.wiki
-- Return the label of a given data item, optionally in a given language.
function p.label(frame)
    if frame.args[1] == nil then
        entity = mw.wikibase.getEntityObject()
        if not entity then return nil end
        id = entity.id
    else
        id = frame.args[1]
    end
    if frame.args[2] then
    	return mw.wikibase.getLabelByLang(id, frame.args[2])
    end
    return mw.wikibase.label( id )
end

-- copiado de ca.wiki
-- Return the language code of the label of a given data item.
function p.label_lang(frame)
	local id
    if frame.args[1] == nil then
        entity = mw.wikibase.getEntityObject()
        if not entity then return nil end
        id = entity.id
    else
        id = frame.args[1]
    end
    local _, lang = mw.wikibase.getLabelWithLang(id)
    return lang
end

-- copiado de ca.wiki
-- Return the local page about a given data item, optionary in a given wiki.
function p.page(frame)
    if frame.args[1] == nil then
        entity = mw.wikibase.getEntityObject()
        if not entity then return nil end
        id = entity.id
    else
        id = frame.args[1]
    end
    return mw.wikibase.sitelink(id, frame.args[2])
end

--copiado de ca.wiki
-- Return the first value of given property of the item linked to the current page.
function p.firstproperty(frame)
    local property = frame.args[1]
    local entity = mw.wikibase.getEntityObject()
    if not entity then return nil end
    if not entity.claims then return nil end
    local hasProp = entity.claims[property]
    if not hasProp then return nil end
    return hasProp[0].mainsnak.datavalue.value
end

-- Devolve a páxina local dun ítem dado.
function p.enlace(frame)
        if frame.args[1] == nil then
            entity = mw.wikibase.getEntityObject()
            if not entity then return nil end
 
            id = entity.id
        else
            id = frame.args[1]
        end
 
        return mw.wikibase.sitelink( id )
end

-- Devolve a descrición dun ítem dado.
function p.descricion(frame)
        if frame.args[1] == nil then
            entity = mw.wikibase.getEntityObject()
            if not entity then return nil end
 
            id = entity.id
        else
            id = frame.args[1]
        end
 
        return mw.wikibase.description( id )
end

return p