package ffmpeg

import "errors"

var (
	ErrInvalidInput  = errors.New("invalid input")
	ErrInvalidOutput = errors.New("invalid output")
	ErrCodecNotFound = errors.New("codec not found")
	ErrFormatNotSupported = errors.New("format not supported")
	ErrDecodeFailed  = errors.New("decode failed")
	ErrEncodeFailed  = errors.New("encode failed")
	ErrFilterFailed  = errors.New("filter failed")
	ErrIOFailed      = errors.New("I/O operation failed")
	ErrNoStream      = errors.New("no stream found")
	ErrInvalidCodec  = errors.New("invalid codec")
)

// FFmpegError wraps FFmpeg errors with additional context
type FFmpegError struct {
	Code    int
	Message string
	Op      string
}

func (e *FFmpegError) Error() string {
	return e.Op + ": " + e.Message + " (code: " + itoa(e.Code) + ")"
}

func itoa(n int) string {
	if n < 0 {
		return "-" + uitoa(uint(-n))
	}
	return uitoa(uint(n))
}

func uitoa(n uint) string {
	if n == 0 {
		return "0"
	}
	var buf [20]byte
	i := len(buf)
	for n > 0 {
		i--
		buf[i] = byte('0' + n%10)
		n /= 10
	}
	return string(buf[i:])
}