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|
module Model.Payment
( perPage
, Payments
, Payment
, PaymentId
, Frequency(..)
, paymentsDecoder
, paymentIdDecoder
, deletePayment
, totalPayments
, punctual
, monthly
, groupAndSortByMonth
) where
import Date exposing (..)
import Json.Decode as Json exposing ((:=))
import Model.User exposing (UserId, userIdDecoder)
import Model.Date exposing (dateDecoder)
import Utils.List as List
import Utils.Date as Date
perPage : Int
perPage = 8
type alias Payments = List Payment
type alias Payment =
{ id : PaymentId
, creation : Date
, name : String
, cost : Int
, userId : UserId
, frequency : Frequency
}
type alias PaymentId = Int
type Frequency = Punctual | Monthly
paymentsDecoder : Json.Decoder Payments
paymentsDecoder = Json.list paymentDecoder
paymentDecoder : Json.Decoder Payment
paymentDecoder =
Json.object6 Payment
("id" := paymentIdDecoder)
("creation" := dateDecoder)
("name" := Json.string)
("cost" := Json.int)
("userId" := userIdDecoder)
("frequency" := frequencyDecoder)
paymentIdDecoder : Json.Decoder PaymentId
paymentIdDecoder = Json.int
frequencyDecoder : Json.Decoder Frequency
frequencyDecoder =
Json.customDecoder
Json.string
(\input -> case input of
"Punctual" -> Ok Punctual
"Monthly" -> Ok Monthly
_ -> Err ("Could not deduce Punctual nor Monthly from " ++ input)
)
deletePayment : PaymentId -> Payments -> Payments
deletePayment paymentId = List.filter (((/=) paymentId) << .id)
totalPayments : (Payment -> Bool) -> UserId -> Payments -> Int
totalPayments paymentFilter userId payments =
payments
|> List.filter (\payment ->
paymentFilter payment
&& payment.userId == userId
&& payment.frequency == Punctual
)
|> List.map .cost
|> List.sum
punctual : Payments -> Payments
punctual = List.filter ((==) Punctual << .frequency)
monthly : UserId -> Payments -> Payments
monthly userId = List.filter (\p -> p.frequency == Monthly && p.userId == userId)
groupAndSortByMonth : Payments -> List ((Month, Int), Payments)
groupAndSortByMonth payments =
payments
|> List.groupBy (\payment -> (Date.year payment.creation, Date.monthToNum << Date.month <| payment.creation))
|> List.sortBy fst
|> List.map (\((year, month), payments) -> ((Date.numToMonth month, year), payments))
|> List.reverse
|
