{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE MultiWayIf #-}
module Main (main) where

import Control.Monad
import Data.Aeson (encodeFile, Value, toJSON)
import System.FilePath
import System.Exit
import System.IO

import Eventlog.Args (args, Args(..))
import Eventlog.Bands (bands)
import Eventlog.HtmlTemplate
import Eventlog.Data
import Eventlog.Vega
import Eventlog.VegaTemplate
import Eventlog.Types

main :: IO ()
main = do
  a <- args
  when (null (files a)) exitSuccess
  argsToOutput a

argsToOutput :: Args -> IO ()
argsToOutput a@Args{files = files, outputFile = Nothing} =
  if | json a    -> forM_ files $ \file -> doOneJson a file (file <.> "json")
     | otherwise -> forM_ files $ \file -> doOneHtml a file (file <.> "html")
argsToOutput a@Args{files = [fin], outputFile = Just fout} =
  if | json a    -> doOneJson a fin fout
     | otherwise -> doOneHtml a fin fout
argsToOutput _ =
  die "When the -o option is specified, exactly one eventlog file has to be passed."

doOneJson :: Args -> FilePath -> FilePath -> IO ()
doOneJson a fin fout = do
  (_, val) <- generateJson fin a
  encodeFile fout val

doOneHtml :: Args -> FilePath -> FilePath -> IO ()
doOneHtml a fin fout = do
  (header, data_json) <- generateJsonValidate checkTraces fin a
  let html = templateString header data_json a
  writeFile fout html
  where
    checkTraces :: ProfData -> IO ()
    checkTraces (ProfData _ _ _ ts) =
      if length ts > 1000
        then hPutStrLn stderr
              "More than 1000 traces, consider reducing using -i or -x"
        else return ()