package main

import (
	"embed"
	"fmt"
	"html/template"
	"io"
	"log"
	"net/http"
)

//go:embed templates/*.html
var templates embed.FS
var echoTemplate = template.Must(
	template.ParseFS(templates, "templates/echo.html"),
)

type EchoData struct {
	Method     string
	URL        string
	Path       string
	Query      string
	Host       string
	Proto      string
	RemoteAddr string
	Headers    map[string][]string
	Body       string
	TLS        bool
}

func echoHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	bodyBytes, err := io.ReadAll(r.Body)
	if err != nil {
		http.Error(w, "Failed to read body: "+err.Error(), http.StatusBadRequest)
		return
	}

	data := EchoData{
		Method:     r.Method,
		URL:        r.URL.String(),
		Path:       r.URL.Path,
		Query:      r.URL.RawQuery,
		Host:       r.Host,
		RemoteAddr: r.RemoteAddr,
		Proto:      r.Proto,
		Headers:    r.Header,
		Body:       string(bodyBytes),
		TLS:        r.TLS != nil,
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := echoTemplate.Execute(w, data); err != nil {
		http.Error(w, fmt.Sprintf("Template error: %v", err), http.StatusInternalServerError)
	}
}

func main() {
	http.HandleFunc("/", echoHandler)
	port := "8080"
	log.Printf("Starting echo server on port %s...\n", port)
	log.Fatal(http.ListenAndServe(":"+port, nil))
}