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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
data Event =
Today
| NextWeek
deriving (Eq, Show)
mailSubject :: [Birthdate] -> [Birthdate] -> Text
mailSubject birthdaysToday birthdaysNextWeek =
T.concat
[ "Hey, "
, if not . null $ birthdaysToday
then mailSubjectSentence Today birthdaysToday
else ""
, if not . null $ birthdaysNextWeek
then
T.concat
[ if not . null $ birthdaysToday then " and " else ""
, mailSubjectSentence NextWeek birthdaysNextWeek
]
else
""
, "!"
]
mailSubjectSentence :: Event -> [Birthdate] -> Text
mailSubjectSentence event birthdates =
let count = length birthdates
in T.concat
[ case event of
Today -> if count > 1 then "there are" else "there is"
NextWeek -> "there will be"
, " "
, T.pack . show $ count
, " birthday"
, if count > 1 then "s" else ""
, " "
, if event == Today then "today" else "next week"
]
mailBody :: Date -> [Birthdate] -> [Birthdate] -> Text
mailBody currentDate birthdaysToday birthdaysNextWeek =
T.concat
[ if not . null $ birthdaysToday
then mailBodySentence Today currentDate birthdaysToday
else ""
, if not . null $ birthdaysNextWeek
then
T.concat
[ if not . null $ birthdaysToday then " " else ""
, mailBodySentence NextWeek currentDate birthdaysNextWeek
]
else ""
]
mailBodySentence :: Event -> Date -> [Birthdate] -> Text
mailBodySentence event currentDate birthdates =
T.concat $ map (mailBodyPart event 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)
mailBodyPart :: Event -> Date -> (Line, Birthdate) -> Text
mailBodyPart event currDate (line, birthdate) =
T.concat
[ case line of
x | x `elem` [SingleLine, FirstLine] ->
if event == Today then "Today, " else "Next week, "
MiddleLine ->
", "
LastLine ->
" and "
_ ->
""
, fullname birthdate
, if event == Today then " is " else " will be "
, T.pack . show $
if event == Today
then age currDate birthdate
else ageNextWeek currDate birthdate
, " years old"
, if line == SingleLine || line == LastLine then "." else ""
]
|
