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|
module Main exposing (main)
import Browser
import ChordInspector
import Html exposing (..)
import Html.Attributes exposing (..)
import Html.Events exposing (..)
import Piano
import Random
import Random.List
import Tempo
import Theory
import Time exposing (..)
type alias Model =
{ whitelistedChords : List Theory.Chord
, selectedChord : Theory.Chord
, isPaused : Bool
, tempo : Int
, firstNote : Theory.Note
, lastNote : Theory.Note
, debug :
{ enable : Bool
, inspectChord : Bool
}
}
type Msg
= NextChord
| NewChord Theory.Chord
| Play
| Pause
| IncreaseTempo
| DecreaseTempo
| SetTempo String
| ToggleInspectChord
tempoStep : Int
tempoStep =
5
{-| Return the number of milliseconds that elapse during an interval in a
`target` bpm.
-}
bpmToMilliseconds : Int -> Int
bpmToMilliseconds target =
let
msPerMinute =
1000 * 60
in
round (toFloat msPerMinute / toFloat target)
cmajor : Theory.Chord
cmajor =
{ note = Theory.C4
, chordType = Theory.MajorDominant7
, chordInversion = Theory.Root
}
{-| The initial state for the application.
-}
init : Model
init =
let
( firstNote, lastNote ) =
( Theory.C3, Theory.C5 )
in
{ whitelistedChords = Theory.allChords firstNote lastNote
, selectedChord = cmajor
, isPaused = True
, tempo = 60
, firstNote = firstNote
, lastNote = lastNote
, debug =
{ enable = True
, inspectChord = True
}
}
subscriptions : Model -> Sub Msg
subscriptions { isPaused, tempo } =
if isPaused then
Sub.none
else
Time.every (tempo |> bpmToMilliseconds |> toFloat) (\_ -> NextChord)
{-| 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
NewChord chord ->
( { model | selectedChord = chord }
, Cmd.none
)
NextChord ->
( model
, Random.generate
(\x ->
case x of
( Just chord, _ ) ->
NewChord chord
( Nothing, _ ) ->
NewChord cmajor
)
(Random.List.choose model.whitelistedChords)
)
Play ->
( { model | isPaused = False }
, Cmd.none
)
Pause ->
( { model | isPaused = True }
, Cmd.none
)
IncreaseTempo ->
( { model | tempo = model.tempo + tempoStep }
, Cmd.none
)
DecreaseTempo ->
( { model | tempo = model.tempo - tempoStep }
, Cmd.none
)
ToggleInspectChord ->
( { model
| debug =
{ inspectChord = not model.debug.inspectChord
, enable = model.debug.enable
}
}
, Cmd.none
)
SetTempo tempo ->
( { model
| tempo =
case String.toInt tempo of
Just x ->
x
Nothing ->
model.tempo
}
, Cmd.none
)
playPause : Model -> Html Msg
playPause { isPaused } =
if isPaused then
button [ onClick Play ] [ text "Play" ]
else
button [ onClick Pause ] [ text "Pause" ]
debugger : Html Msg
debugger =
fieldset []
[ label [] [ text "Inspect Chord" ]
, input [ type_ "checkbox", onClick ToggleInspectChord, checked init.debug.inspectChord ] []
]
view : Model -> Html Msg
view model =
case Theory.notesForChord model.selectedChord of
Nothing ->
p [] [ text ("""
We cannot render the chord that you provided because the
notes that comprise the chord fall off either the upper
or lower end of the piano.
Chord:
""" ++ Theory.inspectChord model.selectedChord) ]
Just x ->
div []
[ Tempo.render
{ tempo = model.tempo
, handleIncrease = IncreaseTempo
, handleDecrease = DecreaseTempo
, handleInput = SetTempo
}
, playPause model
, if model.debug.enable then
debugger
else
span [] []
, if model.debug.inspectChord then
ChordInspector.render model.selectedChord
else
span [] []
, p [] [ text (Theory.viewChord model.selectedChord) ]
, Piano.render
{ highlight = x
, start = model.firstNote
, end = model.lastNote
}
]
{-| For now, I'm just dumping things onto the page to sketch ideas.
-}
main =
Browser.element
{ init = \() -> ( init, Cmd.none )
, subscriptions = subscriptions
, update = update
, view = view
}
|
