// Refer: https://github.com/tkhr-sait/timekeeper/blob/master/src/command/say.go
// Only for Windows OS

package windows

import (
	"fmt"
	"io/ioutil"
	"os"
	"os/exec"
	"runtime"
)

type TTS struct {
	tempFile string // content
	rate     string // speed
	inited   bool
}

func (self *TTS) Init() {
	if self.rate == "" {
		self.rate = "3" // Defalut
	}
	if runtime.GOOS == "windows" {
		tmpfile, _ := ioutil.TempFile("", "tempTTS_")
		script := `
		set TTS = CreateObject("SAPI.SpVoice")
		TTS.rate=` + self.rate + `
		TTS.Speak(WScript.Arguments(0))
		`
		tmpfile.WriteString(script)
		tmpfile.Close()
		self.tempFile = tmpfile.Name() + ".vbs"
		os.Rename(tmpfile.Name(), self.tempFile)
	}
	self.inited = true
}

func (self *TTS) RemoveTempFile() {
	if runtime.GOOS == "windows" {
		os.Remove(self.tempFile)
	}
}

// Set speed.
func (self *TTS) SetRate(rate int) {
	self.rate = fmt.Sprintf("%d", rate)
}

// Say
func (self *TTS) say(message string) *exec.Cmd {
	if !self.inited {
		self.Init()
	}
	if runtime.GOOS == "windows" {
		return exec.Command("cscript", "//Nologo", self.tempFile, message)
	} else {
		return exec.Command("say", message)
	}
}

// Say and not wait
func (self *TTS) SayNotWait(message string) {
	self.say(message).Start()
}

// Say and wait
func (self *TTS) SayWait(message string) {
	self.say(message).Run()
}

func TestTTS() {
	var tts TTS
	tts.SayNotWait("Hello")
}