--------------------------------------------------------------------
-- |
-- Module    : Generate sparkline graphs of hackage uploads
-- Copyright : (c) Don Stewart 2008
-- License   : BSD3
--
-- Maintainer: Don Stewart <dons@galois.com>
-- Stability : provisional
-- Portability:
--
--------------------------------------------------------------------

import Data.List
import Data.Maybe
import Graphics.Rendering.HSparklines
import System.Directory
import System.FilePath
import System.Locale
import System.Time
import System.Time.Parse
import Text.HTML.Download

url = "http://hackage.haskell.org/packages/archive/log"

png1 = "hackage-monthly.png"
png2 = "hackage-daily.png"

graph = barSpark -- { bgColor = rgb 0xEE 0xEE 0xEE }

main :: IO ()
main = do
    pwd <- getCurrentDirectory
    src <- openURL url

    let dates = catMaybes . sort . map parse . lines $ src

    let today     = last dates
        permonth  = groupBy month dates
        thismonth = groupBy day . filter (month today) $ dates
        monthlies = map genericLength permonth
        dailies   = map genericLength thismonth
        top       = maximum monthlies

    graph1 <- make (graph { limits = (0,round top) })  monthlies
    graph2 <- make (graph { limits = (0,20) }) dailies

    savePngFile png1 graph1
    savePngFile png2 graph2

    putStrLn $ "Wrote: " ++ pwd </> png1
    putStrLn $ "Wrote: " ++ pwd </> png2

  where
    parse = parseCalendarTime defaultTimeLocale "%c"
    month a b = ctYear a == ctYear b && ctMonth a == ctMonth b
    day   a b = month a b && ctDay a == ctDay b