module Test.Calendar.Easter
  ( testEaster,
  )
where

import Data.Time.Calendar.Compat
import Data.Time.Calendar.Easter.Compat
import Data.Time.Format.Compat
import Test.Calendar.EasterRef
import Test.Tasty
import Test.Tasty.HUnit

--
days :: [Day]
days = [ModifiedJulianDay 53000 .. ModifiedJulianDay 53014]

showWithWDay :: Day -> String
showWithWDay = formatTime defaultTimeLocale "%F %A"

testEaster :: TestTree
testEaster =
  testCase "testEaster" $
    let ds = unlines $ map (\day -> unwords [showWithWDay day, "->", showWithWDay (sundayAfter day)]) days
        f y =
          unwords
            [ show y ++ ", Gregorian: moon,",
              show (gregorianPaschalMoon y) ++ ": Easter,",
              showWithWDay (gregorianEaster y)
            ]
            ++ "\n"
        g y =
          unwords
            [ show y ++ ", Orthodox : moon,",
              show (orthodoxPaschalMoon y) ++ ": Easter,",
              showWithWDay (orthodoxEaster y)
            ]
            ++ "\n"
     in assertEqual "" testEasterRef $ ds ++ concatMap (\y -> f y ++ g y) [2000 .. 2020]
