{-# LANGUAGE CPP #-}
{-|
hledger-web - a hledger add-on providing a web interface.
Copyright (c) 2007-2010 Simon Michael <simon@joyful.com>
Released under GPL version 3 or later.
-}

module Hledger.Web.Main where

#if __GLASGOW_HASKELL__ <= 610
import Prelude hiding (putStr, putStrLn)
import System.IO.UTF8 (putStr, putStrLn)
#endif
import Control.Concurrent (forkIO, threadDelay)
import Network.Wai.Handler.SimpleServer (run)
import System.Exit (exitFailure)
import System.IO.Storage (withStore, putValue,)
import Yesod.Content (typeByExt)
import Yesod.Helpers.Static (fileLookupDir)
import System.Console.GetOpt

import Hledger.Cli.Options
import Hledger.Cli.Utils (withJournalDo, openBrowserOn)
import Hledger.Cli.Version (progversionstr, binaryfilename)
import Hledger.Data
import Hledger.Web.App (App(..), withApp)
import Hledger.Web.Files (createFilesIfMissing)
import Hledger.Web.Settings (browserstartdelay, defhost, defport, datadir)


progname_web = progname_cli ++ "-web"

options_web :: [OptDescr Opt]
options_web = [
  Option ""  ["base-url"]     (ReqArg BaseUrl "URL") "use this base url (default http://localhost:PORT)"
 ,Option ""  ["port"]         (ReqArg Port "N")      "serve on tcp port N (default 5000)"
 ]

usage_preamble_web =
  "Usage: hledger-web [OPTIONS] [PATTERNS]\n" ++
  "\n" ++
  "Reads your ~/.journal file, or another specified by $LEDGER or -f, and\n" ++
  "starts a web ui server. Also attempts to start a web browser (unless --debug).\n" ++
  "\n"

usage_options_web = usageInfo "hledger-web options:" options_web ++ "\n"

usage_web = concat [
             usage_preamble_web
            ,usage_options_web
            ,usage_options_cli
            ,usage_postscript_cli
            ]

main :: IO ()
main = do
  (opts, args) <- parseArgumentsWith $ options_cli++options_web
  run opts args
    where
      run opts args
       | Help `elem` opts             = putStr usage_web
       | Version `elem` opts          = putStrLn $ progversionstr progname_web
       | BinaryFilename `elem` opts   = putStrLn $ binaryfilename progname_web
       | otherwise                    = withJournalDo opts args "web" web

-- | The web command.
web :: [Opt] -> [String] -> Journal -> IO ()
web opts args j = do
  created <- createFilesIfMissing
  if created
   then do
     putStrLn $ "Installing support files in "++datadir++" - done, please run again."
     exitFailure
   else do
     putStrLn $ "Using support files in "++datadir
     let host    = defhost
         port    = fromMaybe defport $ portFromOpts opts
         baseurl = fromMaybe (printf "http://%s:%d" host port) $ baseUrlFromOpts opts
     unless (Debug `elem` opts) $ forkIO (browser baseurl) >> return ()
     server baseurl port opts args j

server :: String -> Int -> [Opt] -> [String] -> Journal -> IO ()
server baseurl port opts args j = do
  printf "Starting http server on port %d with base url %s\n" port baseurl
  withStore "hledger" $ do
    putValue "hledger" "journal" j
    withApp App{
              -- appConnPool=Nothing
              appRoot=baseurl
             ,appDataDir=datadir
             ,appStatic=fileLookupDir datadir $ typeByExt -- ++[("hamlet","text/plain")]
             ,appOpts=opts
             ,appArgs=args
             ,appJournal=j
             } $ run port

browser :: String -> IO ()
browser baseurl = do
  threadDelay $ fromIntegral browserstartdelay
  putStrLn "Attempting to start a web browser"
  openBrowserOn baseurl >> return ()