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module ServerCommunication
  ( sendRequest
  ) where

import Signal
import Task as Task exposing (Task)
import Http
import Json.Decode exposing (..)
import Date
import Time exposing (Time)
import Debug

import SimpleHTTP exposing (..)

import Model.Communication exposing (..)
import Model.Action as U
import Model.Action.LoggedInAction as UL
import Model.Action.MonthlyAction as UM
import Model.Action.AccountAction as UA
import Model.View.LoggedIn.AddPayment exposing (Frequency(..))
import Model.Payment exposing (..)

import Update.SignIn exposing (updateSignIn)

import InitViewAction exposing (initViewAction)

sendRequest : Communication -> Task Http.Error U.Action
sendRequest communication =
  case communication of

    NoCommunication ->
      Task.succeed U.NoOp

    SignIn assertion ->
      post ("/signIn?assertion=" ++ assertion)
        |> flip Task.andThen (always initViewAction)

    AddPayment name cost ->
      post (addPaymentURL name cost Punctual)
        |> flip Task.andThen (decodeHttpValue <| "id" := paymentIdDecoder)
        |> Task.map (\paymentId -> (U.UpdateLoggedIn (UL.AddPayment paymentId name cost)))

    AddMonthlyPayment name cost ->
      post (addPaymentURL name cost Monthly)
        |> flip Task.andThen (decodeHttpValue <| "id" := paymentIdDecoder)
        |> Task.map (\id -> U.UpdateLoggedIn (UL.AddMonthlyPayment id name cost))

    DeletePayment payment currentPage ->
      post (deletePaymentURL payment.id)
        |> Task.map (always (U.UpdateLoggedIn (UL.DeletePayment payment)))

    DeleteMonthlyPayment id ->
      post (deletePaymentURL id)
        |> Task.map (always (U.UpdateLoggedIn (UL.UpdateMonthly (UM.DeletePayment id))))

    SetIncome currentTime amount ->
      post ("/income?amount=" ++ (toString amount))
        |> Task.map (always (U.UpdateLoggedIn (UL.UpdateAccount (UA.UpdateIncome currentTime amount))))

    SignOut ->
      post "/signOut"
        |> Task.map (always U.GoSignInView)

addPaymentURL : String -> Int -> Frequency -> String
addPaymentURL name cost frequency =
  "/payment/add?name=" ++ name ++ "&cost=" ++ (toString cost) ++ "&frequency=" ++ (toString frequency)

deletePaymentURL : PaymentId -> String
deletePaymentURL id =
  "payment/delete?id=" ++ (toString id)