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Main.elm
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Main.elm
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module Main exposing (..)
import List exposing (range, map, concatMap, append, filter, foldr)
import Dict exposing (fromList, get, insert, remove, values)
import Random exposing (generate)
import Html exposing (Html, div, text, h3, button)
import Html.Attributes exposing (style)
import Html.Events exposing (onClick)
import Keyboard exposing (KeyCode, ups)
import Board exposing (..)
import Styles
main : Program Never Model Msg
main =
Html.program { init = init, update = update, view = view, subscriptions = subscriptions }
-- MODEL
type alias Model =
{ board : Board
, status : GameStatus
}
type GameStatus
= Playing
| Finished
init : ( Model, Cmd Msg )
init =
( { board = emptyBoard
, status = Playing
}
, generate BoardGenerated randomBoard
)
subscriptions : Model -> Sub Msg
subscriptions model =
let
arrowKeys =
fromList
[ ( 37, Left )
, ( 38, Up )
, ( 39, Right )
, ( 40, Down )
]
keyPressed code =
case get code arrowKeys of
Just direction ->
ArrowKeyPressed direction
_ ->
OtherKeyPressed code
in
ups keyPressed
-- UPDATE
type Msg
= BoardGenerated Board
| TileClicked Tile Coord
| ArrowKeyPressed Direction
| OtherKeyPressed KeyCode
| Replay
update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
case msg of
BoardGenerated board ->
if isSolvable board && not (isFinished board) then
( { board = board, status = Playing }, Cmd.none )
else
init
Replay ->
init
ArrowKeyPressed direction ->
let
updatedBoard =
model.board |> slideTo direction
in
( { board = updatedBoard, status = verify updatedBoard }, Cmd.none )
TileClicked tile coords ->
case findAdjacentHole model.board coords of
Nothing ->
( model, Cmd.none )
Just holeCoords ->
let
updatedBoard =
model.board |> moveTile tile coords holeCoords
in
( { board = updatedBoard, status = verify updatedBoard }, Cmd.none )
_ ->
( model, Cmd.none )
verify : Board -> GameStatus
verify board =
if isFinished board then
Finished
else
Playing
-- VIEW
view : Model -> Html Msg
view model =
div [ style (Styles.container size) ]
([ (renderBoard model.board) ] ++ (renderFinishedScreen model.status))
renderBoard : Board -> Html Msg
renderBoard board =
div [] (concatMap (renderRow board) (range 1 size))
renderRow : Board -> Row -> List (Html Msg)
renderRow board row =
append
(map (renderTile board row) (range 1 size))
[ div [ style Styles.lineBreak ] [] ]
renderTile : Board -> Row -> Column -> Html Msg
renderTile board row column =
case get ( row, column ) board of
Nothing ->
div [ style Styles.hole ] []
Just tile ->
div
[ style Styles.tile
, onClick (TileClicked tile ( row, column ))
]
[ text (toString tile) ]
renderFinishedScreen : GameStatus -> List (Html Msg)
renderFinishedScreen status =
case status of
Playing ->
[]
Finished ->
[ div [ style Styles.victoryOverlay ]
[ h3 [ style Styles.victoryTitle ] [ text "YOU WIN!" ]
, button [ style Styles.replayButton, onClick Replay ] [ text "Play Again" ]
]
]