append metadata tags after saving tracks

also rewrite requests to monochrome using 2 helper methods

monochrome/album.go

@@ -1,13 +1,21 @@
 package monochrome
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
-	"net/url"
 	"strconv"
+	"strings"
 )
 
+type AlbumArtist struct {
+	ID        int    `json:"id"`
+	Name      string `json:"name"`
+	PictureID string `json:"picture"`
+}
+
 type AlbumTrack struct {
 	Type string `json:"type"`
 	Item struct {
@@ -30,6 +38,8 @@ type AlbumInfo struct {
 	CoverID        string         `json:"cover"`
 	VibrantColor   string         `json:"vibrantColor"`
 	Explicit       bool           `json:"explicit"`
+	Artist         AlbumArtist    `json:"artist"`
+	Artists        []AlbumArtist  `json:"artists"`
 	Items          []AlbumTrack   `json:"items"`
 }
 
@@ -38,25 +48,42 @@ type AlbumInfoResponse struct {
 }
 
 func (c *Client) AlbumInfo(id int) (*AlbumInfo, error) {
-	req, err := http.NewRequest("GET", c.config.ApiURL+"/album", nil)
+	req, err := c.makeRequest("GET", "/album", nil, map[string]string{
+		"id": strconv.Itoa(id),
+	})
 	if err != nil {
 		return nil, fmt.Errorf("failed to create request: %v", err)
 	}
 
-	params := url.Values{}
-	params.Set("id", strconv.Itoa(id))
-	req.URL.RawQuery = params.Encode()
-
-	resp, err := http.DefaultClient.Do(req)
+	data, err := c.do(req)
 	if err != nil {
 		return nil, fmt.Errorf("failed to send request: %v", err)
 	}
-	defer resp.Body.Close()
 
 	response := AlbumInfoResponse{}
-	if err := json.NewDecoder(resp.Body).Decode(&response); err != nil {
+	if err := json.NewDecoder(bytes.NewReader(data)).Decode(&response); err != nil {
 		return nil, fmt.Errorf("failed to decode json response: %v", err)
 	}
 
 	return &response.Data, nil
 }
+
+func (c *Client) AlbumCoverImage(coverId string) ([]byte, error) {
+	coverUrl := fmt.Sprintf("%s/%s/640x640.jpg", "https://resources.tidal.com/images", strings.ReplaceAll(coverId, "-", "/"))
+	resp, err := http.Get(coverUrl)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.Header.Get("Content-Type") != "image/jpeg" {
+		return nil, fmt.Errorf("invalid response type: got %s", resp.Header.Get("Content-Type"))
+	}
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %v", err)
+	}
+
+	return data, nil
+}