package main

import (
	"html/template"
	"log"
	"net/http"
	"sort"
	"strings"
)

type TemplateHandler struct {
	handler http.Handler
}

func (t *TemplateHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {

	w.Header().Set("Server", "uhttpd")

	// We use our custom handler to prettify directories. Files are served via default.
	if !strings.HasSuffix(r.URL.Path, "/") {
		t.handler.ServeHTTP(w, r)
		return
	}

	rec := NewRecorder()

	defer rec.Body.Reset()

	// passing the recorder instead of the real ResponseWriter
	t.handler.ServeHTTP(rec, r)

	// let the standard lib handle all the caching
	if rec.Code > 300 && rec.Code < 400 {
		log.Println("Code: ", rec.Code)
		t.handler.ServeHTTP(w, r)
		return
	}

	// we copy the original headers first
	for k, v := range rec.Header() {
		w.Header()[k] = v
	}

	// not found
	if rec.Code == 404 {
		w.Header().Set("Content-Type", "text/html")
		w.WriteHeader(404)
		tmpl := template.New("404")
		tmpl, err := tmpl.Parse(get404())
		if err != nil {
			log.Println(err.Error())
			w.WriteHeader(500)
			w.Write([]byte(err.Error()))
			return
		}

		err = tmpl.Execute(w, struct{ URL string }{URL: r.URL.Path})
		if err != nil {
			log.Println(err.Error())
			w.WriteHeader(500)
			w.Write([]byte(err.Error()))
			return
		}
		return
	}

	// we serve a file instead of a html page
	if !strings.Contains(w.Header().Get("Content-Type"), "text/html") {
		w.Write(rec.Body.Bytes())
		return
	}

	data := rec.Body.String()

	// we serve the directoy page
	if strings.HasPrefix(data, "<pre>") {
		execTemplate(w, r, data)
	} else {
		w.Write(rec.Body.Bytes())
	}
}

func execTemplate(w http.ResponseWriter, r *http.Request, data string) {

	links := getToken(data)
	sort.Sort(LinksAsSlice(links)) // see sort.go

	tmpl := template.New("page")
	tmpl, err := tmpl.Parse(getTemplate())
	if err != nil {
		log.Println(err.Error())
		w.WriteHeader(500)
		w.Write([]byte(err.Error()))
		return
	}

	err = tmpl.Execute(w, struct {
		Links       []Link
		URL         string
		Favicon     template.HTML
		AllowUpload bool
	}{Links: links, URL: r.URL.Path, Favicon: getFavicon(), AllowUpload: _allow_upload})
	if err != nil {
		log.Println(err)
	}

}