config: add config package and wire it into server and handlers

Replace the hardcoded server.Config with an ini-backed config package
that reads /etc/openstore/openstore.conf then the user's config file, so
user settings override system ones and both override the built-in
defaults. Missing files are ignored rather than fatal.

Move route registration into a handlers package that owns the templates
and builds a Page view model, which removes the server -> handlers
import cycle along with the setter-based context injection.

4 files changed, 79 insertions, 28 deletions

diff --git a/internal/server/handlers/handlers.go b/internal/server/handlers/handlers.go
new file mode 100644
index 0000000..958ca30
--- /dev/null
+++ b/internal/server/handlers/handlers.go
@@ -0,0 +1,25 @@
+package handlers
+
+import (
+	"html/template"
+	"net/http"
+
+	"codeberg.org/mihna123/openstore/internal/config"
+	"codeberg.org/mihna123/openstore/internal/web"
+)
+
+type Handler struct {
+	tmpl *template.Template
+	cfg  *config.Config
+}
+
+func Routes(conf *config.Config) *http.ServeMux {
+	handler := Handler{
+		tmpl: template.Must(template.ParseFS(web.Files, "templates/*.html")),
+		cfg:  conf,
+	}
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /{$}", handler.home)
+
+	return mux
+}
diff --git a/internal/server/handlers/pages.go b/internal/server/handlers/pages.go
new file mode 100644
index 0000000..8c5bfb5
--- /dev/null
+++ b/internal/server/handlers/pages.go
@@ -0,0 +1,24 @@
+package handlers
+
+import (
+	"log/slog"
+	"net/http"
+
+	"codeberg.org/mihna123/openstore/internal/config"
+)
+
+type Page struct {
+	Lang     string
+	Instance config.Instance
+	Data     any
+}
+
+func (h *Handler) home(w http.ResponseWriter, r *http.Request) {
+	page := Page{Lang: "en", Instance: h.cfg.Instance}
+	err := h.tmpl.ExecuteTemplate(w, "index.html", page)
+
+	if err != nil {
+		slog.Error("render template", "err", err.Error())
+		return
+	}
+}
diff --git a/internal/server/server.go b/internal/server/server.go
index a444958..a2f2d45 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -5,55 +5,39 @@ import (
 	"net"
 	"time"
 
-	"html/template"
 	"net/http"
 
-	"codeberg.org/mihna123/openstore/internal/web"
+	"codeberg.org/mihna123/openstore/internal/config"
+	"codeberg.org/mihna123/openstore/internal/server/handlers"
 )
 
-type Config struct {
-	Name string
-}
-
 type Server struct {
-	config *Config
-	tmpl   *template.Template
+	config *config.Config
 	mux    *http.ServeMux
 }
 
-func (s *Server) routes() {
-	s.mux.HandleFunc("GET /{$}", func(w http.ResponseWriter, r *http.Request) {
-		err := s.tmpl.ExecuteTemplate(w, "index.html", s.config)
-
-		if err != nil {
-			slog.Error("render template", "err", err.Error())
-			return
-		}
-	})
-}
-
-func (s *Server) Serve(addr string) error {
+func (s *Server) Serve() error {
 	httpSrv := &http.Server{
 		Handler:           logRequests(s.mux),
 		ReadHeaderTimeout: 5 * time.Second,
 		WriteTimeout:      10 * time.Second,
 	}
 
-	ln, err := net.Listen("tcp", addr)
+	ln, err := net.Listen("tcp", s.config.Serve.Addr)
 	if err != nil {
 		return err
 	}
 
-	slog.Info("listening", "name", s.config.Name, "addr", addr)
+	slog.Info("listening", "name", s.config.Instance.Name, "addr", s.config.Serve.Addr)
 	return httpSrv.Serve(ln)
 }
 
-func New(c *Config) *Server {
+func New(c *config.Config) *Server {
+	mux := handlers.Routes(c)
 	s := &Server{
 		config: c,
-		mux:    http.NewServeMux(),
-		tmpl:   template.Must(template.ParseFS(web.Files, "templates/*.html")),
+		mux:    mux,
 	}
-	s.routes()
+
 	return s
 }
diff --git a/internal/server/server_test.go b/internal/server/server_test.go
index 7e6a748..aea434f 100644
--- a/internal/server/server_test.go
+++ b/internal/server/server_test.go
@@ -7,6 +7,8 @@ import (
 	"os"
 	"strings"
 	"testing"
+
+	"codeberg.org/mihna123/openstore/internal/config"
 )
 
 func TestMain(m *testing.M) {
@@ -14,9 +16,23 @@ func TestMain(m *testing.M) {
 	os.Exit(m.Run())
 }
 
+func newTestConfig(t *testing.T) *config.Config {
+	t.Helper()
+	return &config.Config{
+		Serve: config.Serve{
+			Addr: ":3000",
+		},
+		Instance: config.Instance{
+			Name:         "TestStore",
+			ContactEmail: "test@email.com",
+			BaseURL:      "https://example.com",
+		},
+	}
+}
+
 func newTestServer(t *testing.T) *Server {
 	t.Helper()
-	return New(&Config{Name: "test"})
+	return New(newTestConfig(t))
 }
 
 func TestRoutes(t *testing.T) {
@@ -47,7 +63,9 @@ func TestRoutes(t *testing.T) {
 }
 
 func TestIndexRendersTemplate(t *testing.T) {
-	s := New(&Config{Name: "testname123"})
+	cfg := newTestConfig(t)
+	cfg.Instance.Name = "testname123"
+	s := New(cfg)
 
 	rec := httptest.NewRecorder()
 	s.mux.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/", nil))