module Example01 exposing (main)

import Browser
import Html exposing (div, text)
import Html.Attributes exposing (style)
import Json.Decode
import Json.Encode
import LngLat exposing (LngLat)
import MapCommands
import Mapbox.Cmd.Option as Opt
import Mapbox.Element exposing (..)
import Mapbox.Expression as E exposing (false, float, int, str, true)
import Mapbox.Layer as Layer
import Mapbox.Source as Source
import Mapbox.Style as Style exposing (Style(..))


main =
    Browser.document
        { init = init
        , view = view
        , update = update
        , subscriptions = \m -> Sub.none
        }


init () =
    ( { position = LngLat 0 0, features = [] }, Cmd.none )


type Msg
    = Hover EventData
    | Click EventData


update msg model =
    case msg of
        Hover { lngLat, renderedFeatures } ->
            ( { model | position = lngLat, features = renderedFeatures }, Cmd.none )

        Click { lngLat, renderedFeatures } ->
            ( { model | position = lngLat, features = renderedFeatures }, MapCommands.fitBounds [ Opt.linear True, Opt.maxZoom 10 ] ( LngLat.map (\a -> a - 0.2) lngLat, LngLat.map (\a -> a + 0.2) lngLat ) )


geojson =
    Json.Decode.decodeString Json.Decode.value """
{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "id": 1,
      "properties": {
        "name": "Bermuda Triangle",
        "area": 1150180
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [-64.73, 32.31],
            [-80.19, 25.76],
            [-66.09, 18.43],
            [-64.73, 32.31]
          ]
        ]
      }
    }
  ]
}
""" |> Result.withDefault (Json.Encode.object [])


hoveredFeatures : List Json.Encode.Value -> MapboxAttr msg
hoveredFeatures =
    List.map (\feat -> ( feat, [ ( "hover", Json.Encode.bool True ) ] ))
        >> featureState


view model =
    { title = "Mapbox Example"
    , body =
        [ css
        , div [ style "width" "100vw", style "height" "100vh" ]
            [ map
                [ maxZoom 5
                , onMouseMove Hover
                , onClick Click
                , id "my-map"
                , eventFeaturesLayers [ "changes" ]
                , hoveredFeatures model.features
                ]
                (Style
                    { transition = Style.defaultTransition
                    , light = Style.defaultLight
                    , sources =
                        [ Source.vectorFromUrl "composite" "mapbox://mapbox.mapbox-terrain-v2,mapbox.mapbox-streets-v7"
                        , Source.geoJSONFromValue "changes" [] geojson
                        ]
                    , misc =
                        [ Style.name "light"
                        , Style.defaultCenter <| LngLat 20.39789404164037 43.22523201923144
                        , Style.defaultZoomLevel 1.5967483759772743
                        , Style.sprite "mapbox://sprites/mapbox/streets-v7"
                        , Style.glyphs "mapbox://fonts/mapbox/{fontstack}/{range}.pbf"
                        ]
                    , layers =
                        [ Layer.background "background"
                            [ E.rgba 246 246 244 1 |> Layer.backgroundColor
                            ]
                        , Layer.fill "landcover"
                            "composite"
                            [ Layer.sourceLayer "landcover"
                            , E.any
                                [ E.getProperty (str "class") |> E.isEqual (str "wood")
                                , E.getProperty (str "class") |> E.isEqual (str "scrub")
                                , E.getProperty (str "class") |> E.isEqual (str "grass")
                                , E.getProperty (str "class") |> E.isEqual (str "crop")
                                ]
                                |> Layer.filter
                            , Layer.fillColor (E.rgba 227 227 227 1)
                            , Layer.fillOpacity (float 0.6)
                            ]
                        , Layer.symbol "place-city-lg-n"
                            "composite"
                            [ Layer.sourceLayer "place_label"
                            , Layer.minzoom 1
                            , Layer.maxzoom 14
                            , Layer.filter <|
                                E.all
                                    [ E.getProperty (str "scalerank") |> E.greaterThan (int 2)
                                    , E.getProperty (str "type") |> E.isEqual (str "city")
                                    ]
                            , Layer.textField <|
                                E.format
                                    [ E.getProperty (str "name_en")
                                        |> E.formatted
                                        |> E.fontScaledBy (float 1.2)
                                    , E.formatted (str "\n")
                                    , E.getProperty (str "name")
                                        |> E.formatted
                                        |> E.fontScaledBy (float 0.8)
                                        |> E.withFont (E.strings [ "DIN Offc Pro Medium" ])
                                    ]
                            , Layer.textTransform <| E.ifElse (E.getProperty (str "name_en") |> E.isEqual (str "Vienna")) E.uppercase E.none
                            ]
                        , Layer.fill "changes"
                            "changes"
                            [ Layer.fillOpacity (E.ifElse (E.toBool (E.featureState (str "hover"))) (float 0.9) (float 0.1))
                            ]
                        ]
                    }
                )
            , div [ style "position" "absolute", style "bottom" "20px", style "left" "20px" ] [ text (LngLat.toString model.position) ]
            ]
        ]
    }