module View.Formatter exposing (formatContent)

import Elmoji
import Html exposing (..)
import Html.Attributes exposing (..)
import HtmlParser
import String.Extra exposing (replace)
import Mastodon.Model exposing (..)
import Types exposing (..)
import View.Events exposing (..)


-- Custom Events
-- Views


formatContent : String -> List Mention -> List (Html Msg)
formatContent content mentions =
    content
        |> replace " ?" " ?"
        |> replace " !" " !"
        |> replace " :" " :"
        |> HtmlParser.parse
        |> toVirtualDom mentions


{-| Converts nodes to virtual dom nodes.
-}
toVirtualDom : List Mention -> List HtmlParser.Node -> List (Html Msg)
toVirtualDom mentions nodes =
    List.map (toVirtualDomEach mentions) nodes


createLinkNode : List ( String, String ) -> List HtmlParser.Node -> List Mention -> Html Msg
createLinkNode attrs children mentions =
    case (getMentionForLink attrs mentions) of
        Just mention ->
            Html.node "a"
                ((List.map toAttribute attrs)
                    ++ [ onClickWithPreventAndStop (LoadAccount mention.id) ]
                )
                (toVirtualDom mentions children)

        Nothing ->
            Html.node "a"
                ((List.map toAttribute attrs)
                    ++ [ onClickWithStop NoOp, target "_blank" ]
                )
                (toVirtualDom mentions children)


getHrefLink : List ( String, String ) -> Maybe String
getHrefLink attrs =
    attrs
        |> List.filter (\( name, _ ) -> name == "href")
        |> List.map (\( _, value ) -> value)
        |> List.head


getMentionForLink : List ( String, String ) -> List Mention -> Maybe Mention
getMentionForLink attrs mentions =
    case getHrefLink attrs of
        Just href ->
            mentions
                |> List.filter (\m -> m.url == href)
                |> List.head

        Nothing ->
            Nothing


toVirtualDomEach : List Mention -> HtmlParser.Node -> Html Msg
toVirtualDomEach mentions node =
    case node of
        HtmlParser.Element "a" attrs children ->
            createLinkNode attrs children mentions

        HtmlParser.Element name attrs children ->
            Html.node name (List.map toAttribute attrs) (toVirtualDom mentions children)

        HtmlParser.Text s ->
            Elmoji.text_ s

        HtmlParser.Comment _ ->
            text ""


toAttribute : ( String, String ) -> Attribute msg
toAttribute ( name, value ) =
    attribute name value