// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// [START functions_firebase_auth]

// Package firebase contains a Firestore Cloud Function.
package firebase

import (
	"context"
	"log"
	"time"
)

// AuthEvent is the payload of a Firestore Auth event.
type AuthEvent struct {
	Email    string `json:"email"`
	Metadata struct {
		CreatedAt time.Time `json:"createdAt"`
	} `json:"metadata"`
	UID string `json:"uid"`
}

// HelloAuth is triggered by Firestore Auth events.
func HelloAuth(ctx context.Context, e AuthEvent) error {
	log.Printf("Function triggered by creation or deletion of user: %q", e.UID)
	log.Printf("Created at: %v", e.Metadata.CreatedAt)
	if e.Email != "" {
		log.Printf("Email: %q", e.Email)
	}
	return nil
}

// [END functions_firebase_auth]
