// Copyright 2024 Patial Tech. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package user

import (
	"context"
	"errors"
	"log/slog"

	"gitserver.in/patialtech/rano/db"
	"gitserver.in/patialtech/rano/db/ent"
	"gitserver.in/patialtech/rano/db/ent/verifytoken"
	"gitserver.in/patialtech/rano/util/logger"
)

// VerifyEmailAddress by a token
func VerifyEmailAddress(ctx context.Context, token string) error {
	// decode token
	uid, err := tokenToVerifyEmail(token)
	if err != nil {
		return err
	}

	client := db.Client()

	// get token from DB
	vt, err := client.VerifyToken.Query().Where(verifytoken.TokenEQ(token)).Only(ctx)
	if err != nil {
		if ent.IsNotFound(err) {
			return ErrInvalidToken
		}

		logger.Error(err, slog.String("ref", "pkg/user/verify.VerifyEmail"))
		return ErrInvalidToken
	}

	// all good, lets do the following
	//  1. Update user email verify status
	//  2. Remvoe token from DB
	// do it in a transaction

	tx, err := client.BeginTx(ctx, nil)
	if err != nil {
		logger.Error(err)
		return errors.New("unexpected error")
	}

	// update user email verify status
	if err = tx.User.UpdateOneID(uid).SetEmailVerified(true).Exec(ctx); err != nil {
		return err
	}

	// remove token from DB
	if err = tx.VerifyToken.DeleteOneID(vt.ID).Exec(ctx); err != nil {
		_ = tx.Rollback()
		return err
	}

	// we are all done now,
	// let's commit
	return tx.Commit()
}