package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"path/filepath"

	"golang.org/x/oauth2/google"
	"google.golang.org/api/gmail/v1"
	"google.golang.org/api/option"
)

const CREDENTIALS_DIR = "creds"
const TOKEN_FILE = "token.json"
const CREDENTIALS_FILE = "credentials.json"

func main() {
	ctx := context.Background()
	creds_file := filepath.Join(CREDENTIALS_DIR, CREDENTIALS_FILE)
	creds_b, err := os.ReadFile(creds_file)
	if err != nil {
		log.Fatalf("Unable to read client secret file: %v", err)
	}

	config, err := google.ConfigFromJSON(creds_b, gmail.GmailReadonlyScope)
	if err != nil {
		log.Fatalf("Unable to parse client secret file to config: %v", err)
	}
	client := getClient(config)

	service, err := gmail.NewService(ctx, option.WithHTTPClient(client))
	if err != nil {
		log.Fatalf("Unable to retrieve Gmail client: %v", err)
	}

	user := "me"
	r, err := service.Users.Labels.List(user).Do()
	if err != nil {
		log.Fatalf("Unable to retrieve labels: %v", err)
	}
	if len(r.Labels) == 0 {
		fmt.Println("No labels found")
		return
	}
	fmt.Println("Labels:")
	for _, label := range r.Labels {
		fmt.Printf("- %s\n", label.Name)
	}
}