{-# LANGUAGE UnicodeSyntax, MultiParamTypeClasses #-}
-- | This module contains some empty configs definitions and some function fields of defaultConfig
module Todos.Default.Utils where

import System.Console.ANSI
import Data.Dates

import Todos.Types
import Todos.Dot
import Todos.Default.CmdLine
import Todos.Default.Config
import Todos.Default.Print
import Todos.Tree

-- | Empty BaseConfig
emptyBaseConfig ∷ BaseConfig
emptyBaseConfig = BConfig {
  outOnlyFirst = False,
  outColors = False,
  outIds = False,
  outHighlight = False,
  sorting = DoNotSort,
  pruneL = Limit 20,
  minL = Limit 0,
  commandToRun = JustShow,
  prefix = Nothing,
  outputFormat = "%s %D%t%n  %d",
  indentString = "  ",
  skipStatus = False,
  groupByFile = False,
  groupByTag = False,
  groupByStatus = False,
  forcedStatus = Nothing,
  topStatus = Nothing
}

-- | Default empty DefaultConfig (nullConfig field of defaultConfig)
emptyConfig ∷ DefaultConfig
emptyConfig = DConfig {
  baseConfig = emptyBaseConfig,
  query = Empty }

-- | Default Todos config
defaultConfig ∷ TodosConfig DefaultConfig
defaultConfig = Todos {
  parseCommandLine = parseCmdLine,
  filterTodos = defaultTodosFilter,
  statusConsoleColor = statusColor,
  itemConsoleColor = defItemConsoleColor,
  highlightColor = (Vivid, Magenta),
  itemColor = getColor,
  itemShape = getShape,
  printTodos = defaultPrintTodos,
  nullConfig = emptyConfig
}

-- | Make a list transformer
composeAll ∷ DateTime → DefaultConfig → (Todo → [Todo])
composeAll date conf =
  let pred = compose date $ query conf
      bc = baseConfig conf
  in  pruneSelector bc pred

-- | Default filter for TODOs (filterTodos field of defaultConfig)
defaultTodosFilter ∷ DateTime → DefaultConfig → [Todo] → [Todo]
defaultTodosFilter dt conf todos =
  let t = delTag "-" todos
      bc = baseConfig conf
  in  if outHighlight bc
        then t
        else concatMap (composeAll dt conf) t

-- | Parse command line (default function)
parseCmdLine ∷ DateTime              -- ^ Current date/time
             → DefaultConfig         -- ^ Default config
             → [String]              -- ^ Command line args
             → CmdLineParseResult DefaultConfig
parseCmdLine currDate dc args = 
  case parseCmdLine' currDate args of
    Right (opts, files) → case opts of
                           Help → CmdLineHelp
                           _    → Parsed (buildQuery (baseConfig dc) opts) files
    Left str            → ParseError str

-- | Prepare PrintConfig for console output functions. Is called from realTodos.
mkPrintConfig ∷ (RuntimeConfig c) ⇒ DateTime → c → TodosConfig c → PrintConfig c
mkPrintConfig dt conf tcfg = PConfig {
  printConfig      = conf,
  printStatusColor = statusConsoleColor tcfg,
  printItemColor   = itemConsoleColor tcfg,
  printHighlightColor = highlightColor tcfg,
  doHighlight      = getPredicate dt conf }