hugo-medialog/internal/music/api_spotify.go

package music

import (
	"encoding/json"
	"fmt"
	"hugo-medialog/utils"
	"io/ioutil"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

const (
	spotifyAPIBaseURL = "https://api.spotify.com/v1/search"
	spotifyTokenURL   = "https://accounts.spotify.com/api/token"
)

func getSpotifyToken() (string, error) {
	apiKey := os.Getenv("SPOTIFY_API_KEY")
	apiSecret := os.Getenv("SPOTIFY_SECRET_ID")

	// Prepare the request body
	data := url.Values{}
	data.Set("grant_type", "client_credentials")

	// Prepare the request
	req, err := http.NewRequest("POST", spotifyTokenURL, strings.NewReader(data.Encode()))
	if err != nil {
		return "", err
	}

	// Add the headers
	req.SetBasicAuth(apiKey, apiSecret)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	// Send the request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	// Read the response
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}

	// Parse the response
	var result map[string]interface{}
	if err := json.Unmarshal(body, &result); err != nil {
		return "", err
	}

	// Extract the access token
	accessToken, ok := result["access_token"].(string)
	if !ok {
		return "", fmt.Errorf("could not retrieve access token")
	}

	return accessToken, nil
}

func SearchAlbumByTitle(title string, album *Album) error {
	// Obtain the access token
	accessToken, err := getSpotifyToken()
	if err != nil {
		return err
	}

	// Search URL
	titleEsc := url.QueryEscape(fmt.Sprintf("%s", title))
	url := fmt.Sprintf("%s?q=%s&type=track&limit=1", spotifyAPIBaseURL, titleEsc)

	// Prepare the request and add the auth header
	req, _ := http.NewRequest("GET", url, nil)
	if err != nil {
		return err
	}
	req.Header.Set("Authorization", "Bearer "+accessToken)

	// Send the request
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return err
	}

	// Decode the response
	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return err
	}

	tracks := result["tracks"].(map[string]interface{})["items"].([]interface{})
	track := tracks[0].(map[string]interface{})
	albumData := track["album"].(map[string]interface{})

	album.Artist = track["artists"].([]interface{})[0].(map[string]interface{})["name"].(string)
	album.ID = albumData["id"].(string)
	album.Album = albumData["name"].(string)
	album.ReleaseDate = albumData["release_date"].(string)
	album.Year, _ = strconv.Atoi(strings.Split(album.ReleaseDate, "-")[0])
	album.Subtitle = strconv.Itoa(album.Year)
	album.Tracks = int(albumData["total_tracks"].(float64)) // Spotify envía números como float64
	album.Link = albumData["href"].(string)
	images := albumData["images"].([]interface{})
	if len(images) > 0 {
		firstImage := images[0].(map[string]interface{})
		album.Image = firstImage["url"].(string)
	}

	return nil
}

func DownloadImage(url, slug string) error {
	imageDir := filepath.Join(os.Getenv("MARKDOWN_OUTPUT_MUSIC_DIR"), os.Getenv("IMAGES_OUTPUT_DIR"))
	if err := utils.CreateDirIfNotExists(imageDir); err != nil {
		return err
	}
	filename := fmt.Sprintf("%s.jpg", slug)
	filePath := filepath.Join(imageDir, filename)

	resp, err := http.Get(url)
	if err != nil {
		return fmt.Errorf("error downloading image: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("non-200 response while downloading image: %d", resp.StatusCode)
	}

	file, err := os.Create(filePath)
	if err != nil {
		return fmt.Errorf("error creating image file: %w", err)
	}
	defer file.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return fmt.Errorf("error reading image data: %w", err)
	}

	_, err = file.Write(body)
	if err != nil {
		return fmt.Errorf("error writing image data: %w", err)
	}

	fmt.Printf(" - Image saved successfully at: %s\n", filePath)

	// Generate thumbnails for the specified resolutions
	resolutions := []uint{1024, 640, 320} // Define resolutions array for thumbnails
	if err := utils.GenerateThumbnails(filePath, slug, imageDir, resolutions); err != nil {
		return fmt.Errorf("error generating thumbnails: %w", err)
	}

	return nil
}