Module:Number of works

local p = {}
local CACHE_EXPIRATION = 86400 -- Cache for 24 hours (in seconds)

-- Function to store the result in a page as a cache
local function setCache(category, pages)
    local cacheTitle = mw.title.new("Module:Number of works/cache")
    if cacheTitle then
        local content = mw.text.jsonEncode({
            [category] = {
                pages = pages,
                timestamp = os.time()
            }
        })
        cacheTitle:edit(content, "Updating cached page count for category " .. category)
    end
end

-- Function to get the cached result
local function getCache(category)
    local cacheTitle = mw.title.new("Module:Number of works/cache")
    if cacheTitle and cacheTitle.exists then
        local content = cacheTitle:getContent()
        local cacheData = mw.text.jsonDecode(content)
        
        if cacheData and cacheData[category] then
            local data = cacheData[category]
            local cacheAge = os.time() - data.timestamp
            
            if cacheAge < CACHE_EXPIRATION then
                return data.pages
            end
        end
    end
    return nil
end

-- Main function to get the number of works
function p.getWorkCount(frame)
    local category = frame.args.category or ''
    if category == '' then return "0 works" end

    -- Check the cache first
    local cachedPages = getCache(category)
    if cachedPages then
        if tonumber(cachedPages) == 1 then
            return "1 work"
        else
            return cachedPages .. " works"
        end
    end

    -- No cached result, perform expensive call
    local pages = mw.site.stats.pagesInCategory(category)

    -- Cache the result
    setCache(category, pages)

    -- Return the result
    if tonumber(pages) == 1 then
        return "1 work"
    else
        return pages .. " works"
    end
end

function p.main(frame)
    return p.getWorkCount(frame)
end

return p