package ersteller_lib

import (
	"compress/gzip"
	"io"
	"net/http"
	"strings"
)

type gzipResponseWriter struct {
	io.Writer
	http.ResponseWriter
}

func (w gzipResponseWriter) Write(b []byte) (int, error) {
	return w.Writer.Write(b)
}

// https://gist.github.com/the42/1956518
func MakeGzipHandler(fn http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
			fn.ServeHTTP(w, r)
			return
		}
		w.Header().Set("Content-Encoding", "gzip")
		gz := gzip.NewWriter(w)
		defer gz.Close()
		gzr := gzipResponseWriter{Writer: gz, ResponseWriter: w}
		fn.ServeHTTP(gzr, r)
	})
}

type MiddlewareFunc func(next http.Handler) http.Handler

// https://www.jvt.me/posts/2023/09/01/golang-nethttp-global-middleware/
func UseMiddleware(r HtmxServer, middlewares ...MiddlewareFunc) http.Handler {
	var s http.Handler
	s = r.GetHttpServer()

	for _, mw := range middlewares {
		s = mw(s)
	}

	return s
}

func LoggingMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		Debug("Path ", r.URL.String())
		next.ServeHTTP(w, r)
	})
}

func AcceptHeaderMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		Debug("Accept: %v", r.Header.Get("Accept"))
		next.ServeHTTP(w, r)
	})
}