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{-# LANGUAGE OverloadedStrings #-}
module Model.Mail
( mailSubject
, mailBody
) where
import Data.Text (Text)
import qualified Data.Text as T
import Model.Date
import Model.Birthdate
mailSubject :: [Birthdate] -> Text
mailSubject birthdates =
let count = length birthdates
in T.concat
[ "Hey, "
, if count > 1 then "there are" else "there is"
, " "
, T.pack . show $ count
, " birthday"
, if count > 1 then "s" else ""
, " today!"
]
mailBody :: Date -> [Birthdate] -> Text
mailBody currentDate birthdates =
T.concat $ map (mailLine currentDate) (attachLines birthdates)
attachLines :: [Birthdate] -> [(Line, Birthdate)]
attachLines birthdates =
let count = length birthdates
lineKind 1 = if count == 1 then SingleLine else FirstLine
lineKind line = if line == count then LastLine else MiddleLine
mapFst f (x, y) = (f x, y)
in map (mapFst lineKind) . zip [1..] $ birthdates
data Line =
SingleLine
| FirstLine
| MiddleLine
| LastLine
deriving (Eq, Show)
mailLine :: Date -> (Line, Birthdate) -> Text
mailLine currDate (line, birthdate) =
T.concat
[ case line of
MiddleLine -> ", "
LastLine -> " and "
_ -> ""
, fullname birthdate
, case line of
x | x `elem` [SingleLine, FirstLine] -> " is now "
_ -> " is "
, T.pack . show $ age currDate birthdate
, " years old"
, if line == LastLine then "." else ""
]
|
