Main.elm

module Main exposing (..)

import Browser exposing (UrlRequest(..))
import Browser.Navigation as Navigation
import Css
import Css.Global as Global
import FamilyTree
import Html.Styled as Html exposing (Html)
import Html.Styled.Attributes as Attrs exposing (css)
import Url exposing (Url)
import Url.Parser as Parser exposing ((</>), Parser)


type alias Model =
    { key : Navigation.Key
    , route : Route
    , familyTree : FamilyTree.Model
    }


type Route
    = Index
    | FamilyTree FamilyTree.Route
    | NotFound


parseRoute : Url -> Route
parseRoute url =
    url
        |> Parser.parse
            (Parser.oneOf
                [ Parser.map Index Parser.top
                , Parser.map FamilyTree (Parser.top </> Parser.s "family-tree" </> FamilyTree.routeParser)
                ]
            )
        |> Maybe.withDefault NotFound


pathFor : Route -> String
pathFor route =
    case route of
        Index ->
            "/"

        FamilyTree familyTreeRoute ->
            "/family-tree" ++ FamilyTree.pathFor familyTreeRoute

        NotFound ->
            "/404"


type Msg
    = UrlChanged Url
    | UrlRequested UrlRequest
    | FamilyTreeMsg FamilyTree.Msg


type alias Flags =
    ()


init : Flags -> Url -> Navigation.Key -> ( Model, Cmd Msg )
init _ url key =
    let
        ( familyTree, familyTreeCmd ) =
            FamilyTree.init
    in
    ( { key = key
      , route = parseRoute url
      , familyTree = familyTree
      }
    , Cmd.map FamilyTreeMsg familyTreeCmd
    )


update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
    case msg of
        UrlChanged url ->
            ( { model | route = parseRoute url }
            , Cmd.none
            )

        UrlRequested (Internal url) ->
            ( model
            , Navigation.pushUrl model.key (Url.toString url)
            )

        UrlRequested (External url) ->
            ( model
            , Navigation.load url
            )

        FamilyTreeMsg familyTreeMsg ->
            let
                ( newFamilyTree, familyTreeEffect ) =
                    FamilyTree.update familyTreeMsg model.familyTree
            in
            ( { model | familyTree = newFamilyTree }
            , case familyTreeEffect of
                Just (FamilyTree.Navigate route) ->
                    Navigation.pushUrl model.key (pathFor (FamilyTree route))

                Nothing ->
                    Cmd.none
            )


view : Model -> Browser.Document Msg
view model =
    { title =
        case model.route of
            Index ->
                "Datalog Sample Apps"

            FamilyTree _ ->
                "Family Tree | Datalog Sample Apps"

            NotFound ->
                "Not Found | Datalog Sample Apps"
    , body =
        Html.div
            [ css
                [ Css.maxWidth (Css.px 1024)
                , Css.minHeight (Css.vh 100)
                , Css.margin2 Css.zero Css.auto
                , Css.padding (Css.px 25)
                , Css.boxShadow4 (Css.px 0) (Css.px 0) (Css.px 80) (Css.hex "B2EBF2")
                , Css.backgroundColor (Css.hex "FFF")
                ]
            ]
            [ Global.global
                [ Global.body
                    [ Css.margin Css.zero
                    , Css.fontFamily Css.sansSerif
                    , Css.backgroundColor (Css.hex "E0F7FA")
                    , Css.color (Css.hex "37474F")
                    ]
                , Global.everything [ Css.boxSizing Css.borderBox ]
                ]
            , Html.header
                [ css
                    [ Css.displayFlex
                    , Css.marginBottom (Css.px 25)
                    ]
                ]
                [ Html.p
                    [ css
                        [ Css.marginRight (Css.px 10)
                        , Css.fontWeight Css.bold
                        ]
                    ]
                    [ Html.text "Datalog Sample Apps" ]
                , Html.nav []
                    [ Html.ol
                        [ css
                            [ Css.listStyleType Css.none
                            , Css.margin Css.zero
                            , Css.padding Css.zero
                            , Css.displayFlex
                            ]
                        ]
                        [ viewHeaderLink Index "Index"
                        , viewHeaderLink (FamilyTree FamilyTree.Index) "Family Tree"
                        ]
                    ]
                ]
            , Html.main_ []
                [ case model.route of
                    Index ->
                        viewIndex

                    FamilyTree route ->
                        FamilyTree.view route model.familyTree
                            |> Html.map FamilyTreeMsg

                    NotFound ->
                        viewNotFound
                ]
            , Html.footer
                [ css [ Css.marginTop (Css.px 100) ] ]
                [ Html.hr [] []
                , Html.details []
                    [ Html.summary [] [ Html.text "Debug view of the whole model" ]
                    , Html.text (Debug.toString model)
                    ]
                ]
            ]
            |> Html.toUnstyled
            |> List.singleton
    }


viewHeaderLink : Route -> String -> Html msg
viewHeaderLink route caption =
    Html.li
        [ css
            [ Css.paddingRight (Css.px 10)
            ]
        ]
        [ Html.p []
            [ Html.a
                [ Attrs.href (pathFor route) ]
                [ Html.text caption ]
            ]
        ]


viewIndex : Html Msg
viewIndex =
    Html.div []
        [ Html.h1 [] [ Html.text "Datalog Sample Apps" ]
        , Html.p []
            [ Html.text "These are sample apps for "
            , Html.a
                [ Attrs.href "https://git.bytes.zone/brian/bad-datalog" ]
                [ Html.text "this yet-to-be-named datalog implementation in Elm" ]
            , Html.text ". The source for these lives in the "
            , Html.a
                [ Attrs.href "https://git.bytes.zone/brian/bad-datalog/src/branch/main/sample-apps" ]
                [ Html.code [] [ Html.text "sample-apps" ]
                , Html.text " directory in the repo"
                ]
            , Html.text "."
            ]
        , Html.h2 [] [ Html.text "Apps" ]
        , Html.ul []
            [ Html.li []
                [ Html.a
                    [ Attrs.href (pathFor (FamilyTree FamilyTree.Index)) ]
                    [ Html.text "Family Tree" ]
                ]
            ]
        ]


viewNotFound : Html Msg
viewNotFound =
    Html.text "Not Found!"


main : Program Flags Model Msg
main =
    Browser.application
        { init = init
        , update = update
        , view = view
        , subscriptions = \_ -> Sub.none
        , onUrlChange = UrlChanged
        , onUrlRequest = UrlRequested
        }