module Comp.UserForm exposing ( Model
                              , emptyModel
                              , Msg(..)
                              , view
                              , update
                              , isValid
                              , isNewUser
                              , getUser)

import Html exposing (..)
import Html.Attributes exposing (..)
import Html.Events exposing (onInput, onCheck)
import Data.Flags exposing (Flags)
import Data.UserState exposing (UserState)
import Api.Model.User exposing (User)
import Util.Maybe
import Comp.Dropdown

type alias Model =
    { user: User
    , login: String
    , email: Maybe String
    , state: Comp.Dropdown.Model UserState
    , password: Maybe String
    }

emptyModel: Model
emptyModel =
    { user = Api.Model.User.empty
    , login = ""
    , email = Nothing
    , password = Nothing
    , state = Comp.Dropdown.makeSingleList
              { makeOption = \s -> { value = Data.UserState.toString s, text = Data.UserState.toString s }
              , placeholder = ""
              , options = Data.UserState.all
              , selected = List.head Data.UserState.all
              }
    }

isValid: Model -> Bool
isValid model =
    if model.user.login == "" then
        model.login /= "" && Util.Maybe.nonEmpty model.password
    else
        True

isNewUser: Model -> Bool
isNewUser model =
    model.user.login == ""

getUser: Model -> User
getUser model =
    let
        s = model.user
        state = Comp.Dropdown.getSelected model.state
                |> List.head
                |> Maybe.withDefault Data.UserState.Active
                |> Data.UserState.toString
    in
        {s | login = model.login
           , email = model.email
           , state = state
           , password = model.password
        }


type Msg
    = SetLogin String
    | SetUser User
    | SetEmail String
    | StateMsg (Comp.Dropdown.Msg UserState)
    | SetPassword String

update: Flags -> Msg -> Model -> (Model, Cmd Msg)
update flags msg model =
    case msg of
        SetUser t ->
            let
                state = Comp.Dropdown.makeSingleList
                        { makeOption = \s -> { value = Data.UserState.toString s, text = Data.UserState.toString s }
                        , placeholder = ""
                        , options = Data.UserState.all
                        , selected = Data.UserState.fromString t.state
                                     |> Maybe.map (\u -> List.filter ((==) u) Data.UserState.all)
                                     |> Maybe.andThen List.head
                                     |> Util.Maybe.withDefault (List.head Data.UserState.all)
                        }
            in
                ({model | user = t
                 , login = t.login
                 , email = t.email
                 , password = t.password
                 , state = state }, Cmd.none)

        StateMsg m ->
            let
                (m1, c1) = Comp.Dropdown.update m model.state
            in
                ({model | state = m1}, Cmd.map StateMsg c1)

        SetLogin n ->
            ({model | login = n}, Cmd.none)

        SetEmail e ->
            ({model | email = if e == "" then Nothing else Just e }, Cmd.none)

        SetPassword p ->
            ({model | password = if p == "" then Nothing else Just p}, Cmd.none)


view: Model -> Html Msg
view model =
    div [class "ui form"]
        [div [classList [("field", True)
                        ,("error", model.login == "")
                        ,("invisible", model.user.login /= "")
                        ]
             ]
             [label [][text "Login*"]
             ,input [type_ "text"
                    ,onInput SetLogin
                    ,placeholder "Login"
                    ,value model.login
                    ][]
             ]
        ,div [class "field"]
            [label [][text "E-Mail"]
            ,input [ onInput SetEmail
                   , model.email |> Maybe.withDefault "" |> value
                   , placeholder "E-Mail"
                   ][]
            ]
        ,div [class "field"]
            [label [][text "State"]
            ,Html.map StateMsg (Comp.Dropdown.view model.state)
            ]
        ,div [classList [("field", True)
                        ,("invisible", model.user.login /= "")
                        ,("error", Util.Maybe.isEmpty model.password)
                        ]
             ]
            [label [][text "Password*"]
            ,input [type_ "text"
                   , onInput SetPassword
                   , placeholder "Password"
                   , Maybe.withDefault "" model.password |> value
                   ][]
            ]
        ]