package main

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

type config map[string]interface{}

func envOr(name, val string) string {
	if result := os.Getenv(name); result != "" {
		return result
	}

	return val
}

func loadConfig(cfg config) error {
	fin, err := os.Open(envOr("CONFIG_PATH", "./envspew.json"))
	if err != nil {
		return err
	}
	defer fin.Close()

	return json.NewDecoder(fin).Decode(&cfg)
}

func main() {
	cfg := config{}
	loadConfig(cfg)
	cfg["now"] = time.Now().String()

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		json.NewEncoder(w).Encode(cfg)
	})

	http.ListenAndServe(":"+envOr("PORT", "9001"), nil)
}