package cmd

import (
	"errors"
	"fmt"
	"io"
	"os"

	"github.com/spf13/cobra"
)

var rootCmd = &cobra.Command{
	Use:   "gosay",
	Short: "gosay is a cli tool for performing basic tts",
	Long: `gosay is a cli tool for performing basic tts.
It uses Piper TTS and Aplay to perform speech to text from the cmdline.

Usage:
	gosay "Your message"            # Say a message directly from an argument
	echo "Another message | gosay   # Pipe a message to gosay
	gosay < input.txt               # Redirect from file
`,
	Args: cobra.MaximumNArgs(1),
	Run:  rootRun,
}

// checkStdInSource checks if the source of stdin is a pipe, redirect or file. If true the source can be read.
func checkStdInSource() (bool, error) {
	fileInfo, statErr := os.Stdin.Stat()
	if statErr != nil {
		return false, fmt.Errorf("could not determine stdin source. %s", statErr)
	}
	// perform a bitwise check on to check. True if os.Stdin is not a character device(ie. tty)
	isPiped := (fileInfo.Mode() & os.ModeCharDevice) == 0
	return isPiped, nil
}

// rootRun provides the default command of using gosay "your args"
func rootRun(cmd *cobra.Command, args []string) {
	var err error
	if !(len(args) > 0) {
		isPiped, err := checkStdInSource()
		if !isPiped || err != nil {
			err = errors.New("Must use pipe, redirect from stdin, or provide direct argument")
			cobra.CheckErr(err)
		}
		buf, err := io.ReadAll(os.Stdin)
		cobra.CheckErr(err)

		err = Say(buf)
		cobra.CheckErr(err)
	} else {
		// assume its input is comming from stdin
		err = Say([]byte(args[0]))
	}
	cobra.CheckErr(err)
}

func Execute() {
	if err := rootCmd.Execute(); err != nil {
		fmt.Fprintf(os.Stderr, "An error occurred while executing gosay: %s", err)
		os.Exit(1)
	}
}