From a9ed5484731d245de69e388a40c44dc028f1e0dd Mon Sep 17 00:00:00 2001
From: Achim Rohn <achim@rohn.eu>
Date: Wed, 13 Aug 2025 14:59:28 +0200
Subject: [PATCH] Implement out week change via date input

---
 htmx_route.go | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/htmx_route.go b/htmx_route.go
index d9a50d2..5d8bc3d 100644
--- a/htmx_route.go
+++ b/htmx_route.go
@@ -1,6 +1,8 @@
 package ersteller_lib
 
 import (
+	"encoding/json"
+	"fmt"
 	"maragu.dev/gomponents"
 	htmx "maragu.dev/gomponents-htmx"
 	"net/http"
@@ -16,6 +18,8 @@ type HtmxContext interface {
 	SetActivePath(activePath *ActivePath)
 	GetPath() string
 	GetPathParam(key string, defaultValue ...string) string
+	GetFormValue(key string) string
+	SetHeader(key string, value string)
 }
 
 type HtmxContextImpl struct {
@@ -25,6 +29,20 @@ type HtmxContextImpl struct {
 	activePath *ActivePath
 }
 
+func (c *HtmxContextImpl) SetHeader(key string, value string) {
+	c.res.Header().Set(key, value)
+}
+
+func (c *HtmxContextImpl) GetFormValue(key string) string {
+	err := c.req.ParseForm()
+	if err != nil {
+		Error("failed to parse form", err)
+		c.SetError(err)
+		return ""
+	}
+	return c.req.FormValue(key)
+}
+
 func (c *HtmxContextImpl) SetError(err error) {
 	_, writeErr := c.res.Write([]byte(err.Error()))
 	if writeErr != nil {
@@ -83,6 +101,12 @@ type HtmxPathParam struct {
 	Value string
 }
 
+type LocationRedirectParams struct {
+	Path   string `json:"path"`
+	Target string `json:"target,omitempty"`
+	Swap   string `json:"swap,omitempty"`
+}
+
 type HtmxRoute interface {
 	WithPathParams(params ...HtmxPathParam) HtmxRoute
 	ToUrl(language Language, queryParams ...HtmxPathParam) string
@@ -90,6 +114,7 @@ type HtmxRoute interface {
 	SetActivePath(activePath *ActivePath) HtmxRoute
 	Add(server *http.ServeMux)
 	Execute(c HtmxContext)
+	RedirectToThisRoute(c HtmxContext, params LocationRedirectParams)
 }
 
 func addLanguageToPath(path string, language Language) string {
@@ -105,6 +130,18 @@ type CommonHtmxRoute struct {
 	HtmxMethod HtmxHttpMethodFunction
 }
 
+func (h CommonHtmxRoute) RedirectToThisRoute(c HtmxContext, params LocationRedirectParams) {
+	params.Path = h.ToUrl(c.GetLanguage())
+	jsonData, err := json.Marshal(params)
+	if err != nil {
+		marshalError := fmt.Errorf("failed to marshal LocationRedirectParams: %w, %w", err, params)
+		Error(marshalError)
+		c.SetError(marshalError)
+		return
+	}
+	c.SetHeader("HX-Location", string(jsonData))
+}
+
 func NewCommonHtmxRoute(routeFunc HtmxRouteFunc, paths LanguagePaths, method string,
 	htmxMethod HtmxHttpMethodFunction) *CommonHtmxRoute {
 	return &CommonHtmxRoute{RouteFunc: routeFunc, Paths: paths, Method: method, HtmxMethod: htmxMethod}