package main

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

	"chaosmith-site/blog"
)

type gzipResponseWriter struct {
	io.Writer
	http.ResponseWriter
}

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

func gzipHandler(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
			next.ServeHTTP(w, r)
			return
		}
		w.Header().Set("Content-Encoding", "gzip")
		w.Header().Del("Content-Length")
		gz := gzip.NewWriter(w)
		defer gz.Close()
		next.ServeHTTP(gzipResponseWriter{Writer: gz, ResponseWriter: w}, r)
	})
}

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		http.ServeFile(w, r, "index.html")
	})
	mux.HandleFunc("/ABSTRACTS.png", func(w http.ResponseWriter, r *http.Request) {
		http.ServeFile(w, r, "ABSTRACTS.png")
	})
	mux.Handle("/src/", http.StripPrefix("/src/", http.FileServer(http.Dir("src"))))
	mux.Handle("/content/images/", http.StripPrefix("/content/images/", http.FileServer(http.Dir("content/images"))))

	if err := blog.RegisterRoutes(mux, "content/posts"); err != nil {
		log.Fatalf("blog: %v", err)
	}

	log.Println("listening on :8000")
	http.ListenAndServe(":8000", gzipHandler(mux))
}