From 166cd04e4b28770ede854dafc9ae30eae64102fe Mon Sep 17 00:00:00 2001 From: Joris Date: Mon, 28 Mar 2016 17:51:14 +0200 Subject: Create an empty but reachable user page --- src/client/elm/LoggedIn/Home/Model/Payer.elm | 122 +++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) create mode 100644 src/client/elm/LoggedIn/Home/Model/Payer.elm (limited to 'src/client/elm/LoggedIn/Home/Model') diff --git a/src/client/elm/LoggedIn/Home/Model/Payer.elm b/src/client/elm/LoggedIn/Home/Model/Payer.elm new file mode 100644 index 0000000..65e3f0e --- /dev/null +++ b/src/client/elm/LoggedIn/Home/Model/Payer.elm @@ -0,0 +1,122 @@ +module LoggedIn.Home.Model.Payer + ( Payers + , Payer + , ExceedingPayer + , getOrderedExceedingPayers + ) where + +import Json.Decode as Json exposing (..) +import Dict exposing (..) +import List +import Maybe +import Time exposing (Time) +import Date + +import Model.Payment exposing (Payments, totalPayments) +import Model.User exposing (Users, UserId, userIdDecoder) +import Model.Income exposing (..) + +import Utils.Dict exposing (mapValues) +import Utils.Maybe exposing (isJust) + +type alias Payers = Dict UserId Payer + +type alias Payer = + { preIncomePaymentSum : Int + , postIncomePaymentSum : Int + , incomes : List Income + } + +type alias ExceedingPayer = + { userId : UserId + , amount : Int + } + +getOrderedExceedingPayers : Time -> Users -> Incomes -> Payments -> List ExceedingPayer +getOrderedExceedingPayers currentTime users incomes payments = + let payers = getPayers currentTime users incomes payments + exceedingPayersOnPreIncome = + payers + |> mapValues .preIncomePaymentSum + |> Dict.toList + |> exceedingPayersFromAmounts + in case incomeDefinedForAll (Dict.keys users) incomes of + Just since -> + let postPaymentPayers = mapValues (getPostPaymentPayer currentTime since) payers + mbMaxRatio = + postPaymentPayers + |> Dict.toList + |> List.map (.ratio << snd) + |> List.maximum + in case mbMaxRatio of + Just maxRatio -> + postPaymentPayers + |> mapValues (getFinalDiff maxRatio) + |> Dict.toList + |> exceedingPayersFromAmounts + Nothing -> + exceedingPayersOnPreIncome + Nothing -> + exceedingPayersOnPreIncome + +getPayers : Time -> Users -> Incomes -> Payments -> Payers +getPayers currentTime users incomes payments = + let incomesDefined = incomeDefinedForAll (Dict.keys users) incomes + in Dict.keys users + |> List.map (\userId -> + ( userId + , { preIncomePaymentSum = + totalPayments + (\p -> (Date.toTime p.creation) < (Maybe.withDefault currentTime incomesDefined)) + userId + payments + , postIncomePaymentSum = + totalPayments + (\p -> + case incomesDefined of + Nothing -> False + Just t -> (Date.toTime p.creation) >= t + ) + userId + payments + , incomes = List.filter ((==) userId << .userId) (Dict.values incomes) + } + ) + ) + |> Dict.fromList + +exceedingPayersFromAmounts : List (UserId, Int) -> List ExceedingPayer +exceedingPayersFromAmounts userAmounts = + let mbMinAmount = List.minimum << List.map snd <| userAmounts + in case mbMinAmount of + Nothing -> + [] + Just minAmount -> + userAmounts + |> List.map (\userAmount -> + { userId = fst userAmount + , amount = snd userAmount - minAmount + } + ) + |> List.filter (\payer -> payer.amount > 0) + +type alias PostPaymentPayer = + { preIncomePaymentSum : Int + , cumulativeIncome : Int + , ratio : Float + } + +getPostPaymentPayer : Time -> Time -> Payer -> PostPaymentPayer +getPostPaymentPayer currentTime since payer = + let cumulativeIncome = cumulativeIncomesSince currentTime since payer.incomes + in { preIncomePaymentSum = payer.preIncomePaymentSum + , cumulativeIncome = cumulativeIncome + , ratio = toFloat payer.postIncomePaymentSum / toFloat cumulativeIncome + } + +getFinalDiff : Float -> PostPaymentPayer -> Int +getFinalDiff maxRatio payer = + let postIncomeDiff = + -1 * (maxRatio - payer.ratio) * toFloat payer.cumulativeIncome + |> truncate + in postIncomeDiff + payer.preIncomePaymentSum -- cgit v1.2.3