package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"

	"github.com/asticode/go-astisub"
)

func downloadAndConvertSubtitles(subtitlesURLs string) ([]string, error) {
	var subtitlePaths []string
	urls := strings.Split(subtitlesURLs, ",")

	for _, url := range urls {
		vttPath, err := downloadSubtitle(url)
		if err != nil {
			return nil, fmt.Errorf("error downloading subtitle: %v", err)
		}

		srtPath, err := convertVTTtoSRT(vttPath)
		if err != nil {
			return nil, fmt.Errorf("error converting subtitle: %v", err)
		}

		subtitlePaths = append(subtitlePaths, srtPath)
	}

	return subtitlePaths, nil
}

func downloadSubtitle(url string) (string, error) {
	resp, err := http.Get(url)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	tempFile, err := os.CreateTemp("", "subtitle_*.vtt")
	if err != nil {
		return "", err
	}
	defer tempFile.Close()

	_, err = io.Copy(tempFile, resp.Body)
	if err != nil {
		return "", err
	}

	return tempFile.Name(), nil
}

func convertVTTtoSRT(vttPath string) (string, error) {
	srtPath := strings.TrimSuffix(vttPath, ".vtt") + ".srt"
	s1, _ := astisub.OpenFile(vttPath)
	s1.Write(srtPath)
	return srtPath, nil
}