module Chest.Selection exposing (Model, Msg, init, modifiers, selected, totalSelectedPrice, update, view)

import Api exposing (Item, Loot)
import Dict exposing (Dict)
import Html exposing (..)
import Html.Attributes exposing (..)
import Html.Events exposing (..)
import Set exposing (Set)
import Table


type alias Selection =
    Set Int


type Data a
    = NoData
    | Data (Dict Int a) PriceExtractor


type alias PriceExtractor =
    Item -> Int


type Model
    = Model Selection (Data Int)


init : Maybe (List Int) -> Maybe PriceExtractor -> Model
init maybeInitial hasData =
    Model
        (case maybeInitial of
            Just initial ->
                Set.fromList initial

            Nothing ->
                Set.empty
        )
        (case hasData of
            Just getPrice ->
                Data Dict.empty getPrice

            Nothing ->
                NoData
        )


view : Model -> Loot -> Html Msg
view (Model selection data) loot =
    let
        isSelected =
            itemInSelection selection

        renderRight item =
            case data of
                Data inner getPrice ->
                    let
                        maybeMod =
                            Dict.get item.id inner
                    in
                    renderItemWithPrice
                        (getPrice item)
                        (isSelected item)
                        maybeMod
                        item.id

                NoData ->
                    []
    in
    Table.view
        (Table.renderSelectableRow
            (\item -> [ p [] [ text item.name ] ])
            renderRight
            (\item _ -> SwitchSelectionState item.id)
            isSelected
        )
        loot


renderItemWithPrice : Int -> Bool -> Maybe Int -> Int -> List (Html Msg)
renderItemWithPrice price isSelected maybeMod itemId =
    [ viewPriceWithModApplied
        (Maybe.map (\i -> toFloatingMod i) maybeMod)
        (toFloat price)
    , if isSelected then
        viewPriceModifier itemId <|
            case maybeMod of
                Just mod ->
                    String.fromInt mod

                Nothing ->
                    "0"

      else
        text ""
    ]


toFloatingMod : Int -> Float
toFloatingMod percent =
    (100 + Debug.log "toFloat" (toFloat percent)) / 100



-- Renderers : Item -> Html Msg


viewPriceWithModApplied : Maybe Float -> Float -> Html Msg
viewPriceWithModApplied maybeMod basePrice =
    case maybeMod of
        Just mod ->
            p [ class "level-item has-text-weight-bold" ]
                [ (Debug.log "withMod" (String.fromFloat (basePrice * mod)) ++ "po")
                    |> text
                ]

        Nothing ->
            p [ class "level-item" ] [ (String.fromFloat basePrice ++ "po") |> text ]


viewPriceModifier : Int -> String -> Html Msg
viewPriceModifier id modValue =
    div [ class "level-item field has-addons" ]
        [ div [ class "control has-icons-left" ]
            [ input
                [ type_ "number"
                , value modValue
                , class "input is-small"
                , size 3
                , style "width" "6em"
                , Html.Attributes.min "-50"
                , Html.Attributes.max "50"
                , step "5"
                , onInput (PriceModifierChanged id)
                ]
                []
            , span [ class "icon is-left" ] [ i [ class "fas fa-percent" ] [] ]
            ]
        ]



-- Selection
-- Get list of selected items


selected : Model -> Loot -> Loot
selected (Model selection data) loot =
    List.filter (itemInSelection selection) loot


modifiers : Model -> Loot -> List (Maybe Float)
modifiers (Model selection data) items =
    case data of
        Data inner _ ->
            List.map
                (\item ->
                    Dict.get item.id inner
                        |> Maybe.map toFloatingMod
                )
                items

        NoData ->
            []


totalSelectedPrice : Model -> Loot -> Maybe Float
totalSelectedPrice model loot =
    case selected model loot of
        [] ->
            Nothing

        items ->
            let
                (Model selection data) =
                    model

                getPrice =
                    case data of
                        Data _ getPrice_ ->
                            getPrice_

                        NoData ->
                            .base_price

                modifier item =
                    Maybe.withDefault 1.0 <|
                        Maybe.map toFloatingMod <|
                            case data of
                                Data inner _ ->
                                    Dict.get item.id inner

                                NoData ->
                                    Nothing
            in
            Just <|
                List.foldl (+) 0.0 <|
                    List.map (\item -> toFloat (getPrice item) * modifier item) items


itemInSelection : Selection -> Item -> Bool
itemInSelection selection item =
    Set.member item.id selection



{-
   itemInClaims : Claims -> Item -> Bool
   itemInClaims claims item =
       List.any (\c -> c.loot_id == item.id) claims
-}


switchSelectionState : Int -> Selection -> Selection
switchSelectionState id selection =
    case Set.member id selection of
        True ->
            Set.remove id selection

        False ->
            Set.insert id selection


type Msg
    = SwitchSelectionState Int
    | PriceModifierChanged Int String


update : Msg -> Model -> ( Model, Cmd Msg )
update msg (Model selection data) =
    case msg of
        PriceModifierChanged id value ->
            ( Model selection <|
                case data of
                    Data inner getPrice ->
                        Data
                            (Dict.insert
                                id
                                (case String.toInt value of
                                    Just i ->
                                        i

                                    Nothing ->
                                        0
                                )
                                inner
                            )
                            getPrice

                    NoData ->
                        data
            , Cmd.none
            )

        SwitchSelectionState id ->
            ( Model (switchSelectionState id selection) data, Cmd.none )