package main

import (
	"encoding/json"
	"log"
	"net/http"
	"os"
	"time"
)

type Response struct {
	Service  string `json:"service"`
	Message  string `json:"message"`
	Time     string `json:"time"`
	Hostname string `json:"hostname"`
	Version  string `json:"version"`
}

func main() {
	port := os.Getenv("PORT")
	if port == "" {
		port = "8080"
	}

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		hostname, _ := os.Hostname()
		resp := Response{
			Service:  "demo-go-api",
			Message:  "Hello from Go API!",
			Time:     time.Now().Local().Format(time.RFC3339),
			Hostname: hostname,
			Version:  os.Getenv("VERSION"),
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(resp)
	})

	http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("ok"))
	})

	log.Printf("Listening on :%s", port)
	log.Fatal(http.ListenAndServe(":"+port, nil))
}