From 478b678a6e574dbd3831ee026d1a0367f77508ac Mon Sep 17 00:00:00 2001
From: Kevin Franklin Kim <kevin.kim@bestbytes.com>
Date: Thu, 21 Nov 2024 13:56:10 +0100
Subject: [PATCH] feat: add decode

---
 pkg/http/mpv2/middleware.go |  3 ---
 pkg/sesamy/event.go         |  4 ++++
 pkg/sesamy/event_test.go    | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 3 deletions(-)
 create mode 100644 pkg/sesamy/event_test.go

diff --git a/pkg/http/mpv2/middleware.go b/pkg/http/mpv2/middleware.go
index bcb3fb6..4cc1c24 100644
--- a/pkg/http/mpv2/middleware.go
+++ b/pkg/http/mpv2/middleware.go
@@ -100,7 +100,6 @@ func MiddlewareUserAgent(next MiddlewareHandler) MiddlewareHandler {
 			for i, event := range payload.Events {
 				if value, ok := event.Params.(map[string]any); ok {
 					value["user_agent"] = userAgent
-					event.Params = value
 					payload.Events[i] = event
 				}
 			}
@@ -122,7 +121,6 @@ func MiddlewareIPOverride(next MiddlewareHandler) MiddlewareHandler {
 			for i, event := range payload.Events {
 				if value, ok := event.Params.(map[string]any); ok {
 					value["ip_override"] = ipOverride
-					event.Params = value
 					payload.Events[i] = event
 				}
 			}
@@ -137,7 +135,6 @@ func MiddlewarePageLocation(next MiddlewareHandler) MiddlewareHandler {
 			for i, event := range payload.Events {
 				if value, ok := event.Params.(map[string]any); ok {
 					value["page_location"] = referrer
-					event.Params = value
 					payload.Events[i] = event
 				}
 			}
diff --git a/pkg/sesamy/event.go b/pkg/sesamy/event.go
index e302325..ab50dbf 100644
--- a/pkg/sesamy/event.go
+++ b/pkg/sesamy/event.go
@@ -36,3 +36,7 @@ func (e Event[P]) Decode(output any) error {
 func (e Event[P]) DecodeParams(output any) error {
 	return Decode(e.Params, output)
 }
+
+func (e Event[P]) EncodeParams(input any) error {
+	return Decode(input, &e.Params)
+}
diff --git a/pkg/sesamy/event_test.go b/pkg/sesamy/event_test.go
new file mode 100644
index 0000000..a030d8e
--- /dev/null
+++ b/pkg/sesamy/event_test.go
@@ -0,0 +1,35 @@
+package sesamy_test
+
+import (
+	"testing"
+
+	"github.com/foomo/sesamy-go/pkg/sesamy"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDecodeParams(t *testing.T) {
+	type params struct {
+		Title string `json:"title"`
+	}
+
+	event := sesamy.Event[any]{
+		Name: "test",
+		Params: map[string]any{
+			"title":       "foo",
+			"description": "foo",
+		},
+	}
+
+	var p params
+	require.NoError(t, event.DecodeParams(&p))
+	assert.Equal(t, "foo", p.Title)
+
+	p.Title = "bar"
+
+	require.NoError(t, event.EncodeParams(p))
+	assert.Equal(t, map[string]any{
+		"title":       "bar",
+		"description": "foo",
+	}, event.Params)
+}