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module LoggedIn.Stat.View exposing
  ( view
  )

import Date exposing (Month)
import Dict
import String

import Html exposing (..)
import Html.Attributes exposing (..)

import LoggedData exposing (LoggedData)

import Msg exposing (Msg)

import Model.Payment as Payment exposing (Payments)
import Model.Conf exposing (Conf)
import Model.Translations exposing (getMessage)

import LoggedIn.View.Format as Format
import LoggedIn.View.Date as Date

import View.Plural exposing (plural)
import LoggedIn.View.Format as Format

import Utils.Tuple as Tuple

view : LoggedData -> Html Msg
view loggedData =
  div
    [ class "stat" ]
    [ h1 [] [ text (getMessage "Overall" loggedData.translations) ]
    , paymentsDetail loggedData (Payment.punctual loggedData.payments)
    , h1 [] [ text (getMessage "ByMonths" loggedData.translations) ]
    , monthsDetail loggedData
    ]

paymentsDetail : LoggedData -> Payments -> Html Msg
paymentsDetail loggedData payments =
  ul
    []
    [ li
        []
        [ let single = getMessage "Payment" loggedData.translations
              multiple = getMessage "Payments" loggedData.translations
          in  text <| plural (List.length payments) single multiple
        ]
    , li
        []
        [ text (paymentsSum loggedData.conf payments)
        , text " − "
        , text <| totalPayments loggedData
        ]
    ]

totalPayments : LoggedData -> String
totalPayments loggedData =
  String.join
    ", "
    ( loggedData.users
        |> Dict.toList
        |> List.map (Tuple.mapFst (\userId -> Payment.totalPayments (always True) userId loggedData.payments))
        |> List.sortBy fst
        |> List.map (\(sum, user) ->
             String.concat
               [ Format.price loggedData.conf sum
               , " "
               , getMessage "By" loggedData.translations
               , " "
               , user.name
               ]
           )
    )

monthsDetail : LoggedData -> Html Msg
monthsDetail loggedData =
  ul
    []
    ( Payment.punctual loggedData.payments
        |> Payment.groupAndSortByMonth
        |> List.map (monthDetail loggedData)
    )

monthDetail : LoggedData -> ((Month, Int), Payments) -> Html Msg
monthDetail loggedData ((month, year), payments) =
  li
    []
    [ text (Date.renderMonth loggedData.translations month)
    , text " "
    , text (toString year)
    , text " − "
    , text (paymentsSum loggedData.conf payments)
    ]

paymentsSum : Conf -> Payments -> String
paymentsSum conf payments =
  payments
    |> List.map .cost
    |> List.sum
    |> Format.price conf