package main

import (
	"embed"
	"flag"
	"fmt"
	"io/fs"
	"log"
	"net/http"
	"net/http/httputil"
	"net/url"
	"os"
	"strings"
)

//go:embed all:static
var static embed.FS

func main() {
	port := flag.Int("port", 8080, "puerto del servidor")
	flag.Parse()

	staticFS, err := fs.Sub(static, "static")
	if err != nil {
		log.Fatal(err)
	}

	// Proxy a EasyAppointments API
	// El frontend llama a /ea-api/v1/... y aquí se reescribe y se añade auth
	eaTarget := "http://easyappointments:80"
	if t := os.Getenv("EA_TARGET"); t != "" {
		eaTarget = t
	}
	eaURL, err := url.Parse(eaTarget)
	if err != nil {
		log.Fatal(err)
	}
	eaProxy := httputil.NewSingleHostReverseProxy(eaURL)

	http.HandleFunc("/ea-api/", func(w http.ResponseWriter, r *http.Request) {
		// /ea-api/v1/services → /index.php/api/v1/services
		r.URL.Path = strings.Replace(r.URL.Path, "/ea-api", "/index.php/api", 1)

		// Auth (server-side, nunca se expone al navegador)
		if apiKey := os.Getenv("EA_API_KEY"); apiKey != "" {
			r.Header.Set("Authorization", "Bearer " + apiKey)
		} else if user := os.Getenv("EA_API_USERNAME"); user != "" {
			if pass := os.Getenv("EA_API_PASSWORD"); pass != "" {
				r.SetBasicAuth(user, pass)
			}
		}

		eaProxy.ServeHTTP(w, r)
	})

	http.Handle("/", http.FileServer(http.FS(staticFS)))

	addr := fmt.Sprintf(":%d", *port)
	log.Printf("Servidor iniciado en http://localhost%s", addr)
	log.Fatal(http.ListenAndServe(addr, nil))
}