module Main where

import CLI (Invocation(..), invoked)
import CSV (Row, parse)
import Data.Time (UTCTime(..), getCurrentTime)
import Event (Event)
import Medicine (Medicine, Pharmacy, pharmacy)
import System.Exit (exitFailure, exitSuccess)
import Timeline (State, currentState)

readCSV :: Row a => FilePath -> IO [a]
readCSV filePath = do
  parsed <- parse filePath '\t' <$> readFile filePath
  case parsed of
    Left e -> (putStrLn $ show e) >> exitFailure
    Right rows -> return rows

getCurrentState :: IO State
getCurrentState =
    currentState
  <$> (utctDay <$> getCurrentTime)
  <*> (pharmacy <$> readCSV "medicine.csv")
  <*> readCSV "timeline.csv"

main :: IO ()
main = do
  invocation <- invoked
  case invocation of
    Inventory -> show <$> getCurrentState >>= putStrLn
    Schedule -> putStrLn "schedule"
    Version version -> putStrLn version >> exitSuccess