{-# LANGUAGE UnicodeSyntax #-}

module Todos.Main (todos) where

import Prelude hiding (putStrLn,readFile,getContents,print)
import IO
import Data.Tree
import System.Exit
import System.Cmd (system)

import System.Environment
import Config.Dyre

import Todos.Types
import Todos.Unicode
import Todos.Dates
import Todos.Dot
import Todos.CmdLine
import Todos.Tree
import Todos.ReadConfig
import Todos.Loader
import Todos.CommandParser
import Todos.Config
import Todos.ConfigUtils

realTodos ∷ (RuntimeConfig c) ⇒ TodosConfig c → IO ()
realTodos tcfg = do
  currDate ← getCurrentDateTime 
  config ← readConfig
  args ← getArgs
  let pres = (parseCommandLine tcfg) currDate (nullConfig tcfg) (config ⧺ args)
  case pres of
    Parsed q files' → do
      let bc = toBaseConfig q
      files ← glob files'
      todos ← loadTodo bc currDate files
      let queried  = (filterTodos tcfg) currDate q todos
          format item = item {itemDescr = printfItem (descrFormat bc) item}
      case commandToRun bc of
        JustShow  → printTodos tcfg (mkPrintConfig currDate q tcfg) (mapT format queried)
        ShowAsDot → 
             putStrLn $ showAsDot (itemColor tcfg) (itemShape tcfg) (mapT format queried)
        SystemCommand cmd → do
             forT selected (\item → system $ printfItem cmd (format item))
             return ()
          where selected | outOnlyFirst bc = [Node (rootLabel $ head queried) []]
                         | otherwise       = queried

    ParseError str → error str
    CmdLineHelp → do putStrLn usage
                     exitWith ExitSuccess

-- | Main function to run. User can specify TodosConfig with any runtime config
-- type. By default (in todos.hs) defaultConfig is used, which uses DefaultConfig type.
todos ∷ (RuntimeConfig c) ⇒ TodosConfig c → IO ()
todos = wrapMain $ defaultParams {
    projectName = "todos",
    realMain    = realTodos,
    statusOut   = const (return ())
    }