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module Cart exposing (..)
import Browser
import Browser.Navigation as Nav
import Html exposing (..)
import Html.Attributes exposing (..)
import Html.Events exposing (..)
import Http
import Json.Decode as D
import Json.Encode as Encode
import Url
import Url.Parser as P exposing ((</>), Parser, int, oneOf, s, string)
type alias Product =
{ id : Int
, name : String
, kind : Maybe String
, price : Float
, description : Maybe String
}
type alias Model =
{ pageStatus : Status
, products : List Product
}
type Status
= Loading
| Loaded
| NotLoaded
type Msg
= CartLoaded (Result Http.Error (List Product))
| FetchCartItems
| RemoveFromCart Int
| CartItemRemoved (Result Http.Error ())
init : Model
init =
Model NotLoaded []
update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
case msg of
CartLoaded res ->
case res of
Ok s ->
( { model | products = s, pageStatus = Loaded }, Cmd.none )
Err e ->
let
_ =
Debug.log "error" e
in
( { model | pageStatus = NotLoaded }, Cmd.none )
RemoveFromCart id ->
( model, removeProduct id )
CartItemRemoved _ ->
( { model | pageStatus = Loading }, fetchCartItems )
FetchCartItems ->
( { model | pageStatus = Loading }, fetchCartItems )
decodeProduct : D.Decoder Product
decodeProduct =
D.map5 Product
(D.field "id" D.int)
(D.field "name" D.string)
(D.field "kind" (D.nullable D.string))
(D.field "price" D.float)
(D.field "description" (D.nullable D.string))
decodeResponse : D.Decoder (List Product)
decodeResponse =
D.list decodeProduct
removeProduct : Int -> Cmd Msg
removeProduct id =
let
_ =
Debug.log "cart" "fetching cart items"
in
Http.riskyRequest
{ method = "POST"
, headers = []
, url = "http://127.0.0.1:7878/cart/remove"
, body = Http.stringBody "application/json" <| String.fromInt id
, expect = Http.expectWhatever CartItemRemoved
, timeout = Nothing
, tracker = Nothing
}
fetchCartItems : Cmd Msg
fetchCartItems =
let
_ =
Debug.log "cart" "fetching cart items"
in
Http.riskyRequest
{ method = "GET"
, headers = []
, url = "http://127.0.0.1:7878/cart/items"
, body = Http.emptyBody
, expect = Http.expectJson CartLoaded decodeResponse
, timeout = Nothing
, tracker = Nothing
}
viewStatus : Status -> String
viewStatus s =
case s of
Loading ->
"Loading"
Loaded ->
"Ready!"
NotLoaded ->
"Not loaded ..."
viewProduct : Product -> Html Msg
viewProduct p =
div []
[ text p.name
, div [] [ text <| Maybe.withDefault "" p.kind ]
, div [] [ text <| Maybe.withDefault "" p.description ]
, div [] [ text <| String.fromFloat p.price ]
, div [] [ button [ onClick (RemoveFromCart p.id) ] [ text "Remove" ] ]
, div [] [ a [ href ("/product/" ++ String.fromInt p.id) ] [ text "View Product" ] ]
]
view : Model -> Html Msg
view model =
case model.pageStatus of
Loading ->
div [] [ text <| viewStatus Loading ]
_ ->
div []
[ let
cart =
List.map viewProduct model.products
in
if List.isEmpty cart then
text "No items in cart"
else
ul [] cart
]
|
