You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: branch.go
    path of file: ./repos/gitea/modules/repository
    
    the code of the file until where you have to start completion: // Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package repository

import (
	"context"

	"code.gitea.io/gitea/models/db"
	git_model "code.gitea.io/gitea/models/git"
	repo_model "code.gitea.io/gitea/models/repo"
	"code.gitea.io/gitea/modules/container"
	"code.gitea.io/gitea/modules/git"
	"code.gitea.io/gitea/modules/gitrepo"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/timeutil"
)

// SyncRepoBranches synchronizes branch table with repository branches
func SyncRepoBranches(ctx context.Context, repoID, doerID int64) (int64, error) {
	repo, err := repo_model.GetRepositoryByID(ctx, repoID)
	if err != nil {
		return 0, err
	}

	log.Debug("SyncRepoBranches: in Repo[%d:%s]", repo.ID, repo.FullName())

	gitRepo, err := gitrepo.OpenRepository(ctx, repo)
	if err != nil {
		log.Error("OpenRepository[%s]: %w", repo.FullName(), err)
		return 0, err
	}
	defer gitRepo.Close()

	return SyncRepoBranchesWithRepo(ctx, repo, gitRepo, doerID)
}

func SyncRepoBranchesWithRepo(ctx context.Context, repo *repo_model.Repository, gitRepo *git.Repository, doerID int64) (int64, error) {
	allBranches := container.Set[string]{}
	{
		branches, _, err := gitRepo.GetBranchNames(0, 0)
		if err != nil {
			return 0, err
		}
		log.Trace("SyncRepoBranches[%s]: branches[%d]: %v", repo.FullName(), len(branches), branches)
		for _, branch := range branches {
			allBranches.Add(branch)
		}
	}

	dbBranches := make(map[string]*git_model.Branch)
	{
		branches, err := db.Find[git_model.Branch](ctx, git_model.FindBranchOptions{
			ListOptions: db.ListOptionsAll,
			RepoID:      repo.ID,
		})
		if err != nil {
			return 0, err
		}
		for _, branch := range branches {
			dbBranches[branch.Name] = branch
		}
	}

	va
    
func SyncRepoBranchesWithRepo(ctx context.Context, repo *repo_model.Repository, gitRepo *git.Repository, doerID int64) (int64, error) {
	allBranches := container.Set[string]{}
	{
		branches, _, err := gitRepo.GetBranchNames(0, 0)
		if err != nil {
			return 0, err
		}
		log.Trace("SyncRepoBranches[%s]: branches[%d]: %v", repo.FullName(), len(branches), branches)
		for _, branch := range branches {
			allBranches.Add(branch)
		}
	}

	dbBranches := make(map[string]*git_model.Branch)
	{
		branches, err := db.Find[git_model.Branch](ctx, git_model.FindBranchOptions{
			ListOptions: db.ListOptionsAll,
			RepoID:      repo.ID,
		})
		if err != nil {
			return 0, err
		}
		for _, branch := range branches {
			dbBranches[branch.Name] = branch
		}
	}

	var toAdd []*git_model.Branch
	var toUpdate []*git_model.Branch
	var toRemove []int64
	for branch := range allBranches {
		dbb := dbBranches[branch]
		commit, err := gitRepo.GetBranchCommit(branch)
		if err != nil {
			return 0, err
		}
		if dbb == nil {
			toAdd = append(toAdd, &git_model.Branch{
				RepoID:        repo.ID,
				Name:          branch,
				CommitID:      commit.ID.String(),
				CommitMessage: commit.Summary(),
				PusherID:      doerID,
				CommitTime:    timeutil.TimeStamp(commit.Committer.When.Unix()),
			})
		} else if commit.ID.String() != dbb.CommitID {
			toUpdate = append(toUpdate, &git_model.Branch{
				ID:            dbb.ID,
				RepoID:        repo.ID,
				Name:          branch,
				CommitID:      commit.ID.String(),
				CommitMessage: commit.Summary(),
				PusherID:      doerID,
				CommitTime:    timeutil.TimeStamp(commit.Committer.When.Unix()),
			})
		}
	}

	for _, dbBranch := range dbBranches {
		if !allBranches.Contains(dbBranch.Name) && !dbBranch.IsDeleted {
			toRemove = append(toRemove, dbBranch.ID)
		}
	}

	log.Trace("SyncRepoBranches[%s]: toAdd: %v, toUpdate: %v, toRemove: %v", repo.FullName(), toAdd, toUpdate, toRemove)

	if len(toAdd) == 0 && len(toRemove) == 0 && len(toUpdate) == 0 {
		return int64(len(allBranches)), nil
	}

	if err := db.WithTx(ctx, func(ctx context.Context) error {
		if len(toAdd) > 0 {
			if err := git_model.AddBranches(ctx, toAdd); err != nil {
				return err
			}
		}

		for _, b := range toUpdate {
			if _, err := db.GetEngine(ctx).ID(b.ID).
				Cols("commit_id, commit_message, pusher_id, commit_time, is_deleted").
				Update(b); err != nil {
				return err
			}
		}

		if len(toRemove) > 0 {
			if err := git_model.DeleteBranches(ctx, repo.ID, doerID, toRemove); err != nil {
				return err
			}
		}

		return nil
	}); err != nil {
		return 0, err
	}
	return int64(len(allBranches)), nil
}