package transcoder

import (
	"errors"
	"fmt"
	"os/exec"
	"strings"

	"gitlab.com/ChaotiCryptidz/musicutil/types"
)

type TranscodeConfig struct {
	UseQuality    bool   `json:"use_quality"`
	UseBitrate    bool   `json:"use_bitrate"`
	Encoder       string `json:"encoder"`
	FileExtension string `json:"file_extension"`
	Container     string `json:"container"`
	Bitrate       string `json:"bitrate"`
	Quality       string `json:"quality"`
	SampleRate    string `json:"sample_rate"`
	Channels      string `json:"channels"`
}

func isNotEmptyString(x string) bool {
	if len(strings.TrimSpace(x)) == 0 {
		return false
	}

	return true
}

func Transcode(file *types.File, config *TranscodeConfig, dest string) (string, error) {
	command_args := make([]string, 0)
	command_args = append(command_args, "-y")
	command_args = append(command_args, "-hide_banner")

	command_args = append(command_args, "-i")
	command_args = append(command_args, file.JoinPathTo())

	if isNotEmptyString(config.Encoder) {
		command_args = append(command_args, "-c:a")
		command_args = append(command_args, config.Encoder)
	}

	if isNotEmptyString(config.Container) {
		command_args = append(command_args, "-f")
		command_args = append(command_args, config.Container)
	}

	if isNotEmptyString(config.SampleRate) {
		command_args = append(command_args, "-ar")
		command_args = append(command_args, config.SampleRate)
	}

	if isNotEmptyString(config.Channels) {
		command_args = append(command_args, "-ac")
		command_args = append(command_args, config.Channels)
	}

	if config.UseQuality {
		command_args = append(command_args, "-q:a")
		command_args = append(command_args, config.Quality)
	}

	if config.UseBitrate {
		command_args = append(command_args, "-b:a")
		command_args = append(command_args, config.Bitrate)
	}

	command_args = append(command_args, dest)

	cmd := exec.Command("ffmpeg", command_args...)
	output, err := cmd.CombinedOutput()
	if err != nil {
		fmt.Println(output)
		return string(output), errors.New("ffmpeg error")
	}
	return string(output), nil
}