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module DateTime exposing (DateTime, decoder, encode, toString)

import Iso8601
import Json.Decode as Decode exposing (Decoder)
import Json.Encode as Encode
import Result
import Time


type alias DateTime =
    Time.Posix


decoder : Decoder DateTime
decoder =
    Decode.string
        |> Decode.andThen decodeIsoString


encode : DateTime -> Encode.Value
encode =
    Encode.string << toString


decodeIsoString : String -> Decoder DateTime
decodeIsoString str =
    case Iso8601.toTime str of
        Result.Ok posix ->
            Decode.succeed posix

        Result.Err _ ->
            Decode.fail <| "Invalid date: " ++ str


toString : DateTime -> String
toString =
    Iso8601.fromTime