From 88cca41114a04f7cb6e8bda9ce72b836dbbddf6e Mon Sep 17 00:00:00 2001
From: Guillermo Ramos
Date: Sat, 15 Mar 2025 20:57:33 +0100
Subject: Updates as query strings

---
 front/src/Main.elm | 111 +++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 103 insertions(+), 8 deletions(-)

diff --git a/front/src/Main.elm b/front/src/Main.elm
index 68ead13..4b7692f 100644
--- a/front/src/Main.elm
+++ b/front/src/Main.elm
@@ -29,7 +29,6 @@ import Html.Attributes
     exposing
         ( class
         , disabled
-        , href
         , max
         , min
         , placeholder
@@ -233,6 +232,7 @@ type alias RawSpecs =
     , years : String
     , vat : String
     , fee : String
+    , updates : SimUpdates
     }
 
 
@@ -246,6 +246,7 @@ defaultRawSpecs =
     , years = "30"
     , vat = "6"
     , fee = "3"
+    , updates = defaultSimUpdates
     }
 
 
@@ -264,10 +265,11 @@ rawSpecsParser =
         |> apply (UQ.map (Maybe.withDefault defaultRawSpecs.years) <| UQ.string "years")
         |> apply (UQ.map (Maybe.withDefault defaultRawSpecs.vat) <| UQ.string "vat")
         |> apply (UQ.map (Maybe.withDefault defaultRawSpecs.fee) <| UQ.string "fee")
+        |> apply simUpdatesParser
 
 
 rawSpecsToQS : RawSpecs -> List UB.QueryParameter
-rawSpecsToQS { title, total, initial, rate, i1, years, vat, fee } =
+rawSpecsToQS { title, total, initial, rate, i1, years, vat, fee, updates } =
     [ UB.string "title" title
     , UB.string "total" total
     , UB.string "initial" initial
@@ -277,6 +279,7 @@ rawSpecsToQS { title, total, initial, rate, i1, years, vat, fee } =
     , UB.string "vat" vat
     , UB.string "fee" fee
     ]
+        ++ simUpdatesToQS updates
 
 
 modelToUrl : Model -> String
@@ -378,6 +381,102 @@ type alias SimUpdates =
     }
 
 
+defaultSimUpdates =
+    { periodically = [], byMonth = [] }
+
+
+simUpdatesParser : UQ.Parser SimUpdates
+simUpdatesParser =
+    let
+        parseUpdate str =
+            String.dropLeft 1 str
+                |> String.toFloat
+                |> (case String.left 1 str of
+                        "P" ->
+                            Maybe.map Amortize
+
+                        "I" ->
+                            Maybe.map SetI1
+
+                        _ ->
+                            always Nothing
+                   )
+
+        rawPeriodic str =
+            List.foldr
+                (\kv acc ->
+                    case String.split "-" kv of
+                        [ "p", v ] ->
+                            { acc | period = String.toInt v }
+
+                        [ "f", v ] ->
+                            { acc | from = String.toInt v }
+
+                        [ "t", v ] ->
+                            { acc | to = String.toInt v }
+
+                        [ "u", v ] ->
+                            { acc | upd = parseUpdate v }
+
+                        _ ->
+                            acc
+                )
+                { period = Nothing
+                , from = Nothing
+                , to = Nothing
+                , upd = Nothing
+                }
+                (String.split "," str)
+
+        parsePeriodic rp =
+            case ( rp.period, rp.upd ) of
+                ( Just p, Just u ) ->
+                    Just { period = p, from = rp.from, to = rp.to, upd = u }
+
+                _ ->
+                    Nothing
+
+        parseByMonth str =
+            case String.split ":" str of
+                [ dr, ur ] ->
+                    Maybe.map2 Tuple.pair (String.toInt dr) (parseUpdate ur)
+
+                _ ->
+                    Nothing
+    in
+    UQ.map2 SimUpdates
+        (UQ.custom "u_period" (List.filterMap (parsePeriodic << rawPeriodic)))
+        (UQ.custom "u_bymon" (List.filterMap parseByMonth))
+
+
+simUpdatesToQS : SimUpdates -> List UB.QueryParameter
+simUpdatesToQS { periodically, byMonth } =
+    let
+        renderUpdate u =
+            case u of
+                Amortize f ->
+                    "P" ++ Round.round 2 f
+
+                SetI1 f ->
+                    "I" ++ Round.round 4 f
+
+        renderPeriod { period, from, to, upd } =
+            [ ( "p", Just (String.fromInt period) )
+            , ( "f", Maybe.map String.fromInt from )
+            , ( "t", Maybe.map String.fromInt to )
+            , ( "u", Just (renderUpdate upd) )
+            ]
+                |> List.filterMap (\( k, vr ) -> Maybe.map (\v -> ( k, v )) vr)
+                |> List.map (\( k, v ) -> String.join "-" [ k, v ])
+                |> String.join ","
+
+        renderMonth ( m, u ) =
+            String.join ":" [ String.fromInt m, renderUpdate u ]
+    in
+    List.map (UB.string "u_period" << renderPeriod) periodically
+        ++ List.map (UB.string "u_bymon" << renderMonth) byMonth
+
+
 updatesInMonth : SimUpdates -> Int -> SimUpdates
 updatesInMonth { periodically, byMonth } month =
     let
@@ -424,17 +523,13 @@ type alias SimSpecs =
 
 
 parseSimSpecs : RawSpecs -> Maybe SimSpecs
-parseSimSpecs { total, rate, i1, years } =
+parseSimSpecs { total, rate, i1, years, updates } =
     case
         ( List.map String.toFloat [ total, i1 ]
         , List.map String.toInt [ rate, years ]
         )
     of
         ( [ Just totalValueF, Just i1F ], [ Just rateI, Just yearsI ] ) ->
-            let
-                updates =
-                    { periodically = [], byMonth = [] }
-            in
             Just
                 { principal = totalValueF * toFloat rateI / 100
                 , i1 = i1F
@@ -1074,7 +1169,7 @@ simUpdateView attrs m upd =
             p attrs [ text "+", amountView [] m.settings.currency f ]
 
         SetI1 f ->
-            p attrs [ text <| String.fromFloat f, text "%" ]
+            p attrs [ text <| String.fromFloat (f * 100), text "%" ]
 
 
 quotaView : Model -> MortgageSim -> Quota -> Html Msg
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