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// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

//go:build gogit

package git

import (
	"context"
	"errors"
	"path/filepath"

	gitealog "code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"

	"github.com/go-git/go-billy/v5/osfs"
	gogit "github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing/cache"
	"github.com/go-git/go-git/v5/storage/filesystem"
)

// Repository represents a Git repository.
type Repository struct {
	Path string

	tagCache *ObjectCache

	gogitRepo    *gogit.Repository
	gogitStorage *filesystem.Storage
	gpgSettings  *GPGSettings

	Ctx             context.Context
	LastCommitCache *LastCommitCache
}

// openRepositoryWithDefaultContext opens the repository at the given path with DefaultContext.
func openRepositoryWithDefaultContext(repoPath string) (*Repository, error) {
	return OpenRepository(DefaultContext, repoPath)
}

// OpenRepository opens the repository at the given path within the context.Context
func OpenRepository(ctx context.Context, repoPath string) (*Repository, error) {
	repoPath, err := filepath.Abs(repoPath)
	if err != nil {
		return nil, err
	} else if !isDir(repoPath) {
		return nil, errors.New("no such file or directory")
	}

	fs := osfs.New(repoPath)
	_, err = fs.Stat(".git")
	if err == nil {
		fs, err = fs.Chroot(".git")
		if err != nil {
			return nil, err
		}
	}
	storage := filesystem.NewStorageWithOptions(fs, cache.NewObjectLRUDefault(), filesystem.Options{KeepDescriptors: true, LargeObjectThreshold: setting.Git.LargeObjectThreshold})
	gogitRepo, err := gogit.Open(storage, fs)
	if err != nil {
		return nil, err
	}

	return &Repository{
		Path:         repoPath,
		gogitRepo:    gogitRepo,
		gogitStorage: storage,
		tagCache:     newObjectCache(),
		Ctx:          ctx,
	}, nil
}

// Close this repository, in particular close the underlying gogitStorage if this is not nil
func (repo *Repository) Close() (err error) {
	if repo == nil || repo.gogitStorage == nil {
		return
	}
	if err := repo.gogitStorage.Close(); err != nil {
		gitealog.Error("Error closing storage: %v", err)
	}
	repo.LastCommitCache = nil
	repo.tagCache = nil
	return
}

// GoGitRepo gets the go-git repo representation
func (repo *Repository) GoGitRepo() *gogit.Repository {
	return repo.gogitRepo
}