package main

import (
	"fmt"
	"io"
	"os"
	"os/exec"
	"strings"
	"time"
)

func EncodeVideo(w io.Writer, encArgs, oldFile, newFile string) error {
	if encArgs == "" {
		fmt.Fprintf(w, "\trename file\n\t    from: '%s'\n\t    to: '%s'\n", oldFile, newFile)
		return os.Rename(oldFile, newFile)
	}

	start := time.Now()

	fmt.Fprintf(w, "\tencode file\n\t    from: '%s'\n\t    to: '%s'\n", oldFile, newFile)

	fullArgs := []string{"-y", "-i", oldFile}
	fullArgs = append(fullArgs, strings.Split(encArgs, " ")...)
	fullArgs = append(fullArgs, newFile)

	cmd := exec.Command("ffmpeg", fullArgs...)

	if err := cmd.Start(); err != nil {
		return err
	}

	if err := cmd.Wait(); err != nil {
		return err
	}

	if err := os.Remove(oldFile); err != nil {
		return err
	}

	fmt.Fprintf(w, "\t    done (took %s)\n", time.Since(start).Truncate(100*time.Millisecond))

	return nil
}