Module:Sandbox/Greenbreen/PPP

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local data = require("Module:Sandbox/Greenbreen/PPP/data")

local p = {}

local function getPPP(country, year)
    local c = data[country]
    if not c then return nil end

    year = tonumber(year) or 2016
    return c[year]
end

function p.convert(value, country, year)
    value = tonumber(value)
    if not value or not country then return nil end

    local ppp = getPPP(country, year)
    if not ppp then return nil end

    return value / ppp
end

-- wrapper for template use
function p.convertFrame(frame)
    local args = frame:getParent().args
    local result = p.convert(args[1], args[2], args[3] or args.year)

    if not result then
        return "Error: PPP conversion failed"
    end

    return result
end

return p