package auth

import (
	"fmt"
	"math/rand"

	"github.com/spf13/viper"
	"golang.org/x/oauth2"
)

var (
	letterRunes  = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
	stateRand    *rand.Rand
	googleConfig oauth2.Config
)

func Init(v *viper.Viper) {
	googleConfig = oauth2.Config{
		// ClientID:     "141386065809-og78kt5um5kdtstvlk7m8e00231aadgi.apps.googleusercontent.com",
		ClientID: v.GetString("auth.google.client_id"),
		// ClientSecret: "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",
		ClientSecret: v.GetString("auth.google.client_secret"),
		// RedirectURL:  "http://localhost:9000/v1/health/callback",
		RedirectURL: fmt.Sprintf("%s%s", v.GetString("redirect_url"), v.GetString("auth.google.redirect_uri")),
		Scopes:      []string{"openid email profile"},
		Endpoint: oauth2.Endpoint{
			AuthURL:  "https://accounts.google.com/o/oauth2/v2/auth",
			TokenURL: "https://www.googleapis.com/oauth2/v4/token",
		},
	}
}

// RandToken Generate a random token
func GenerateOauthState() string {
	l := len(letterRunes)
	b := make([]rune, 24)
	for i := range b {
		b[i] = letterRunes[stateRand.Intn(l)]
	}
	return string(b)
}