package main

import (
	"errors"
	"flag"
	"fmt"
	"github.com/dedkovd/noolite"
	"net/http"
	"strings"
	"strconv"
)

func sendCommand(command string, channel, value, r, g, b int) error {
	if channel == -1 {
		return errors.New("Channel was not set")
	}

	if command == "" {
		return errors.New("Command was not set")
	}

	n, err := noolite.DefaultNooliteAdapter()
	defer n.Close()

	if err != nil {
		return err
	}

	if command == "set" {
		if value != 0 {
			return n.SetBrightnesValue(channel, value)
		} else if r != 0 || g != 0 || b != 0 {
			return n.SetBrightnesValues(channel, r, g, b)
		} else {
			return errors.New("Need some value")
		}
	} else {
		commands := map[string]func(int) error{
			"on":               n.On,
			"off":              n.Off,
			"switch":           n.Switch,
			"decraseBrightnes": n.DecraseBrightnes,
			"incraseBrightnes": n.IncraseBrightnes,
			"invertBrightnes":  n.InvertBrightnes,
		}

		cmd, ok := commands[command]

		if !ok {
			return errors.New("Command not found")
		}

		return cmd(channel)
	}
}

func parseParams(path string) (string, int, int, int, int, int) {
	params := strings.Split(path, "/")[1:]

	command := ""
	channel := -1
	value := 0
	r := 0
	g := 0
	b := 0

	command = params[0]
	if len(params) > 1 {
		channel, _ = strconv.Atoi(params[1])
	}
	if len(params) > 2 {
		value, _ = strconv.Atoi(params[2])
	}
	if len(params) == 5 {
		value = 0
		r, _ = strconv.Atoi(params[2])
		g, _ = strconv.Atoi(params[3])
		b, _ = strconv.Atoi(params[4])
	}

	return command, channel, value, r, g, b
}

func main() {
	channel := flag.Int("channel", -1, "Noolite adapter channel")
	command := flag.String("command", "", "Command")
	value := flag.Int("val", 0, "Set value")
	red := flag.Int("r", 0, "Red channel")
	green := flag.Int("g", 0, "Green channel")
	blue := flag.Int("b", 0, "Blue channel")

	http_port := flag.Int("p", -1, "Http port")

	flag.Parse()

	if *http_port < 0 {
		err := sendCommand(*command, *channel, *value, *red, *green, *blue)

		if err != nil {
			panic(err)
		}
	} else {
		http.HandleFunc("/noolite/", func(w http.ResponseWriter, r *http.Request) {
			command, channel, value, red, green, blue := parseParams(r.URL.Path[1:])

			err := sendCommand(command, channel, value, red, green, blue)

			if err != nil {
				fmt.Fprintf(w, "{\"error\": %q}", err)
			} else {
				fmt.Fprintf(w, "{\"command\": %q, \"channel\": \"%d\"}", command, channel)
			}
		})

		fs := http.FileServer(http.Dir("/var/www/static"))

		http.Handle("/static/", http.StripPrefix("/static/", fs))

		panic(http.ListenAndServe(fmt.Sprintf(":%d", *http_port), nil))
	}
}