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|
module State exposing (..)
import Random
import Random.List
import Theory
type Msg
= NextChord
| NewChord Theory.Chord
| Play
| Pause
| SetTempo String
| ToggleInversion Theory.ChordInversion
| ToggleKey Theory.Key
| DoNothing
| SetView View
| ToggleFlashCard
type View
= Preferences
| Practice
| Overview
type alias Model =
{ whitelistedChords : List Theory.Chord
, whitelistedChordTypes : List Theory.ChordType
, whitelistedInversions : List Theory.ChordInversion
, whitelistedPitchClasses : List Theory.PitchClass
, whitelistedKeys : List Theory.Key
, selectedChord : Maybe Theory.Chord
, isPaused : Bool
, tempo : Int
, firstNote : Theory.Note
, lastNote : Theory.Note
, view : View
, showFlashCard : Bool
}
{-| The initial state for the application.
-}
init : Model
init =
let
( firstNote, lastNote ) =
( Theory.C3, Theory.C6 )
inversions =
[ Theory.Root ]
chordTypes =
Theory.allChordTypes
pitchClasses =
Theory.allPitchClasses
keys =
[ { pitchClass = Theory.C, mode = Theory.MajorMode } ]
in
{ whitelistedChords =
keys
|> List.concatMap Theory.chordsForKey
|> List.filter (\chord -> List.member chord.chordInversion inversions)
, whitelistedChordTypes = chordTypes
, whitelistedInversions = inversions
, whitelistedPitchClasses = pitchClasses
, whitelistedKeys = keys
, selectedChord = Nothing
, isPaused = True
, tempo = 10
, firstNote = firstNote
, lastNote = lastNote
, view = Overview
, showFlashCard = True
}
{-| Now that we have state, we need a function to change the state.
-}
update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
case msg of
DoNothing ->
( model, Cmd.none )
SetView x ->
( { model
| view = x
, isPaused = True
}
, Cmd.none
)
NewChord chord ->
( { model | selectedChord = Just chord }
, Cmd.none
)
NextChord ->
( model
, Random.generate
(\x ->
case x of
( Just chord, _ ) ->
NewChord chord
( Nothing, _ ) ->
DoNothing
)
(Random.List.choose model.whitelistedChords)
)
Play ->
( { model | isPaused = False }
, Cmd.none
)
Pause ->
( { model | isPaused = True }
, Cmd.none
)
ToggleInversion inversion ->
let
inversions =
if List.member inversion model.whitelistedInversions then
List.filter ((/=) inversion) model.whitelistedInversions
else
inversion :: model.whitelistedInversions
in
( { model
| whitelistedInversions = inversions
, whitelistedChords =
model.whitelistedKeys
|> List.concatMap Theory.chordsForKey
|> List.filter (\chord -> List.member chord.chordInversion inversions)
}
, Cmd.none
)
ToggleKey key ->
let
keys =
if List.member key model.whitelistedKeys then
List.filter ((/=) key) model.whitelistedKeys
else
key :: model.whitelistedKeys
in
( { model
| whitelistedKeys = keys
, whitelistedChords =
keys
|> List.concatMap Theory.chordsForKey
|> List.filter (\chord -> List.member chord.chordInversion model.whitelistedInversions)
, selectedChord = Nothing
}
, Cmd.none
)
SetTempo tempo ->
( { model
| tempo =
case String.toInt tempo of
Just x ->
x
Nothing ->
model.tempo
}
, Cmd.none
)
ToggleFlashCard ->
( { model | showFlashCard = not model.showFlashCard }, Cmd.none )
|
