package main

import (
	"fmt"
	"log"
	"net"
	"strings"
)

func ShellyRun(config ShellyConfigs, route Route) {
	for message := range route.Destination {
		ip, command, err := parseMessage(config, message)
		if err != nil {
			log.Println(err)
			continue
		}

		log.Printf("Send '%s' to '%s'.", command, ip)
	}
}

func parseMessage(config ShellyConfigs, m MQTTMessage) (ip *net.IP, command string, err error) {
	elements := strings.Split(m.Topic, "/")

	if len(elements) != 3 {
		return nil, "", fmt.Errorf(
			"Expected three topic levels but got %d in '%s'.",
			len(elements), m.Topic,
		)
	}

	if elements[0] != "cover" || elements[2] != "movement" {
		return nil, "", fmt.Errorf("Expected cover/<id>/movement but got: %s", m.Topic)
	}

	switch string(m.Payload) {
	case "extend":
		command = "Cover.Close"
	case "retract":
		command = "Cover.Open"
	case "stop":
		command = "Cover.Stop"
	default:
		return nil, "", fmt.Errorf("Invalid payload '%s'.", m.Payload)
	}

	id := elements[1]

	for _, c := range config {
		if c.ID == id {
			ip := net.ParseIP(c.IP)
			return &ip, command, nil
		}
	}

	return nil, "", fmt.Errorf("Got message for unknown cover '%s'", id)
}