Module:Reading time

local p = {}
local mw = require("mw")

-- Global variables
local minReadingTime
local maxReadingTime

function p.estimateReadingTime(frame)
    local pageTitle = frame.args[1]
    
    if type(pageTitle) == "string" then
        local content = mw.title.new(pageTitle):getContent()

        if type(content) == "string" then
            local wordCount = 0
            for word in content:gmatch("%S+") do
                wordCount = wordCount + 1
            end

            local minSpeed = 160
            local maxSpeed = 238

            minReadingTime = math.floor(wordCount / maxSpeed)
            maxReadingTime = math.ceil(wordCount / minSpeed)

            minReadingTime = math.floor(minReadingTime / 5) * 5
            maxReadingTime = math.ceil(maxReadingTime / 5) * 5

            if minReadingTime == 0 then
                minReadingTime = 1
            end

            return minReadingTime .. "-" .. maxReadingTime .. " minutes"
        else
            return "Error: Invalid content"
        end
    else
        return "Error: Invalid page title"
    end
end

function p.estimateReadingLength(frame)
    if not minReadingTime or not maxReadingTime then
        error("Error: Reading time not calculated")
    end

    local averageReadingTime = (minReadingTime + maxReadingTime) / 2

    if averageReadingTime < 120 then
        return "Short"
    elseif averageReadingTime >= 120 and averageReadingTime < 360 then
        return "Medium"
    elseif averageReadingTime >= 360 and averageReadingTime < 720 then
        return "Long"
    else
        return "Very Long"
    end
end

return p