package main

import (
	"encoding/hex"
	"fmt"
	"os"
	"strconv"

	osc "github.com/jwetzell/osc-go"
	"github.com/spf13/cobra"
)

func main() {
	var Address string
	var Args []string
	var Types []string
	var Slip bool

	var rootCmd = &cobra.Command{
		Use: "makeosc",
		Run: func(cmd *cobra.Command, args []string) {
			make(Address, Args, Types, Slip)
		},
	}
	rootCmd.Flags().StringVar(&Address, "address", "", "OSC address")
	rootCmd.Flags().StringArrayVar(&Args, "arg", []string{}, "OSC args")
	rootCmd.Flags().StringArrayVar(&Types, "type", []string{}, "OSC types")
	rootCmd.Flags().BoolVar(&Slip, "slip", false, "whether to slip encode the OSC Message bytes")
	rootCmd.MarkFlagRequired("address")
	rootCmd.Execute()
}

func argToTypedArg(rawArg string, oscType string) osc.OSCArg {

	switch oscType {
	case "s":
		return osc.OSCArg{
			Value: rawArg,
			Type:  "s",
		}
	case "i":
		number, err := strconv.ParseInt(rawArg, 10, 32)
		if err != nil {
			// ... handle error
			panic(err)
		}
		return osc.OSCArg{
			Value: int32(number),
			Type:  "i",
		}
	case "f":
		number, err := strconv.ParseFloat(rawArg, 32)
		if err != nil {
			// ... handle error
			panic(err)
		}
		return osc.OSCArg{
			Value: float32(number),
			Type:  "f",
		}
	case "b":
		data, err := hex.DecodeString(rawArg)
		if err != nil {
			// ... handle error
			panic(err)
		}
		return osc.OSCArg{
			Value: data,
			Type:  "b",
		}
	case "h":
		number, err := strconv.ParseInt(rawArg, 10, 64)
		if err != nil {
			// ... handle error
			panic(err)
		}
		return osc.OSCArg{
			Value: int64(number),
			Type:  "h",
		}
	case "d":
		number, err := strconv.ParseFloat(rawArg, 64)
		if err != nil {
			// ... handle error
			panic(err)
		}
		return osc.OSCArg{
			Value: float64(number),
			Type:  "d",
		}
	case "T":
		return osc.OSCArg{
			Value: true,
			Type:  "T",
		}
	case "F":
		return osc.OSCArg{
			Value: false,
			Type:  "F",
		}
	case "N":
		return osc.OSCArg{
			Value: nil,
			Type:  "N",
		}
	default:
		fmt.Print("unhandled osc type: ")
		fmt.Printf("%s.\n", oscType)
		// TODO(jwetzell): something better than this like actual nil, err thing
		return osc.OSCArg{}
	}
}

func slipEncode(bytes []byte) []byte {
	END := byte(0xc0)
	ESC := byte(0xdb)
	ESC_END := byte(0xdc)
	ESC_ESC := byte(0xdd)

	var encodedBytes = []byte{END}

	for _, byteToEncode := range bytes {
		if byteToEncode == END {
			encodedBytes = append(encodedBytes, ESC_END)
		} else if byteToEncode == ESC {
			encodedBytes = append(encodedBytes, ESC_ESC)
		} else {
			encodedBytes = append(encodedBytes, byteToEncode)
		}
	}

	encodedBytes = append(encodedBytes, END)
	return encodedBytes
}

func make(address string, args []string, types []string, slip bool) {

	oscMessage := osc.OSCMessage{
		Address: address,
		Args:    []osc.OSCArg{},
	}

	for index, arg := range args {
		oscType := "s"
		if len(types) > index {
			oscType = types[index]
		}

		oscMessage.Args = append(oscMessage.Args, argToTypedArg(arg, oscType))
	}

	oscMessageBuffer := oscMessage.ToBytes()

	if slip {
		oscMessageBuffer = slipEncode(oscMessageBuffer)
	}

	//TODO write buffer to stdout
	os.Stdout.Write(oscMessageBuffer)

}