package main

import (
	"io"
	"fmt"
	"log"
	"net/http"
)

func main() {
	mux := http.NewServeMux()

	mux.Handle("/", http.FileServer(http.Dir("./static")))

	mux.HandleFunc("GET /command/{command}", commandHandler)

	port := 8080
	log.Printf("Running on port %d\n", port)
	if err := http.ListenAndServe(fmt.Sprintf(":%d", port), mux); err != nil {
		log.Fatal(err)
	}
}

func commandHandler(w http.ResponseWriter, r *http.Request) {
	command := r.PathValue("command")

	log.Printf("Handling command %s for %s\n", command, r.RemoteAddr)

	c, ok := commands[command]
	if !ok {
		fmt.Fprintf(w, "Unknown command: %s", command)
		return
	}
	c.Action(w, []string{})
}

type command interface {
	Usage(w io.Writer)
	Action(w io.Writer, args []string)
}

var commands = map[string]command{
	"help": &helpCommand{},
}

type helpCommand struct {}

func (c *helpCommand) Usage(w io.Writer) {
	fmt.Fprintf(w, "Usage: help <command>")
}

func (c *helpCommand) Action(w io.Writer, args []string) {
	fmt.Fprint(w, "Invalid input\r\n")
	c.Usage(w)
}