package main

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"html/template"
	"log"
	"net"
	"sync"

	"github.com/codegangsta/martini"
	"github.com/codegangsta/martini-contrib/render"
)

type Header int32
type ControlPacket [50]uint16
type StatePacket [60]uint16

var mutex sync.Mutex
var templateMap = make(map[string]interface{})
var controlDesc [50]string
var stateDesc [76]string

func init() {
	controlDesc[5] = "Oven Mode"
	controlDesc[6] = "Cook On/Off"
	controlDesc[7] = "Wash On/Off"
	controlDesc[8] = "System On/Off"
	controlDesc[9] = "Temp"
	controlDesc[10] = "Humidity"
	controlDesc[11] = "Time"
	controlDesc[12] = "Preheat On/Off"
	controlDesc[15] = "Convection RPM"
	controlDesc[16] = "Cooldown On/Off"
	controlDesc[17] = "Core Temp"
	controlDesc[20] = "Wash Type"
	controlDesc[21] = "Wash Total"
	controlDesc[22] = "Wash Steps"
	controlDesc[23] = "Wash Step Type"

	stateDesc[0] = "Firmware Y"
	stateDesc[1] = "Firmware Y"
	stateDesc[2] = "Firmware M"
	stateDesc[3] = "Firmware D"
	stateDesc[4] = "Cook State"
	stateDesc[5] = "Temp Setting"
	stateDesc[6] = "Humidity Setting"
	stateDesc[7] = "Time Setting"
	stateDesc[8] = "Temp Value"
	stateDesc[9] = "Humidity Value"
	stateDesc[10] = "Time Value"
	stateDesc[11] = "Wash State"
	stateDesc[12] = "Wash Type"
	stateDesc[13] = "Wash Steps"
	stateDesc[16] = "Door Open/Close"
	stateDesc[32] = "Core Temp 1"
	stateDesc[33] = "Core Temp 2"
	stateDesc[34] = "Core Temp 3"
	stateDesc[35] = "Core Temp 4"
}

func main() {
	go ListenUDP()

	m := martini.Classic()

	m.Use(render.Renderer())

	m.Get("/", func(r render.Render) {
		mutex.Lock()
		defer mutex.Unlock()

		r.HTML(200, "main", templateMap)
	})

	m.Run()
}

func ListenUDP() {
	addr, err := net.ResolveUDPAddr("udp", ":40001")
	if err != nil {
		log.Fatal(err)
	}

	conn, err := net.ListenUDP("udp", addr)
	if err != nil {
		log.Fatal(err)
	}
	defer conn.Close()

	for {
		b := make([]byte, 1024)
		_, _, err := conn.ReadFromUDP(b)
		if err != nil {
			log.Fatal(err)
		}

		buf := bytes.NewReader(b)

		var header Header
		err = binary.Read(buf, binary.LittleEndian, &header)
		if err != nil {
			log.Fatal(err)
		}

		switch header {
		case 0:
			var packet ControlPacket
			err = binary.Read(buf, binary.LittleEndian, &packet)
			if err != nil {
				log.Fatal(err)
			}
			mapControl(packet)
		case 1:
			var packet StatePacket
			err = binary.Read(buf, binary.LittleEndian, &packet)
			if err != nil {
				log.Fatal(err)
			}
			mapState(packet)
		}
	}
}

func mapControl(packet ControlPacket) {
	mutex.Lock()
	defer mutex.Unlock()

	var controlTable string
	for i, v := range packet {
		class := "odd"
		if i%2 == 0 {
			class = "even"
		}

		controlTable += fmt.Sprintf("<tr class=\"%v\"><td>%v</td><td>0x%04X</td><td>0x%04X</td><td>%d</td><td>%v</td></tr>\n", class, 40001+i, i, v, v, controlDesc[i])
	}

	templateMap["Table_Control"] = template.HTML(controlTable)
}

func mapState(packet StatePacket) {
	mutex.Lock()
	defer mutex.Unlock()

	var stateTable string
	for i, v := range packet {
		class := "odd"
		if i%2 == 0 {
			class = "even"
		}

		stateTable += fmt.Sprintf("<tr class=\"%v\"><td>%v</td><td>0x%04X</td><td>0x%04X</td><td>%d</td><td>%v</td></tr>\n", class, 30001+i, i, v, v, stateDesc[i])
	}

	templateMap["Table_State"] = template.HTML(stateTable)
}