// Copyright 2021 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.

package repo

import (
	"context"
	"fmt"
	"strings"
	"time"

	"code.gitea.io/gitea/models/db"
	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/util"
)

// UpdateRepositoryOwnerNames updates repository owner_names (this should only be used when the ownerName has changed case)
func UpdateRepositoryOwnerNames(ownerID int64, ownerName string) error {
	if ownerID == 0 {
		return nil
	}
	ctx, committer, err := db.TxContext()
	if err != nil {
		return err
	}
	defer committer.Close()

	if _, err := db.GetEngine(ctx).Where("owner_id = ?", ownerID).Cols("owner_name").Update(&Repository{
		OwnerName: ownerName,
	}); err != nil {
		return err
	}

	return committer.Commit()
}

// UpdateRepositoryUpdatedTime updates a repository's updated time
func UpdateRepositoryUpdatedTime(repoID int64, updateTime time.Time) error {
	_, err := db.GetEngine(db.DefaultContext).Exec("UPDATE repository SET updated_unix = ? WHERE id = ?", updateTime.Unix(), repoID)
	return err
}

// UpdateRepositoryCols updates repository's columns
func UpdateRepositoryCols(ctx context.Context, repo *Repository, cols ...string) error {
	_, err := db.GetEngine(ctx).ID(repo.ID).Cols(cols...).Update(repo)
	return err
}

// ErrReachLimitOfRepo represents a "ReachLimitOfRepo" kind of error.
type ErrReachLimitOfRepo struct {
	Limit int
}

// IsErrReachLimitOfRepo checks if an error is a ErrReachLimitOfRepo.
func IsErrReachLimitOfRepo(err error) bool {
	_, ok := err.(ErrReachLimitOfRepo)
	return ok
}

func (err ErrReachLimitOfRepo) Error() string {
	return fmt.Sprintf("user has reached maximum limit of repositories [limit: %d]", err.Limit)
}

// ErrRepoAlreadyExist represents a "RepoAlreadyExist" kind of error.
type ErrRepoAlreadyExist struct {
	Uname string
	Name  string
}

// IsErrRepoAlreadyExist checks if an error is a ErrRepoAlreadyExist.
func IsErrRepoAlreadyExist(err error) bool {
	_, ok := err.(ErrRepoAlreadyExist)
	return ok
}

func (err ErrRepoAlreadyExist) Error() string {
	return fmt.Sprintf("repository already exists [uname: %s, name: %s]", err.Uname, err.Name)
}

// ErrRepoFilesAlreadyExist represents a "RepoFilesAlreadyExist" kind of error.
type ErrRepoFilesAlreadyExist struct {
	Uname string
	Name  string
}

// IsErrRepoFilesAlreadyExist checks if an error is a ErrRepoAlreadyExist.
func IsErrRepoFilesAlreadyExist(err error) bool {
	_, ok := err.(ErrRepoFilesAlreadyExist)
	return ok
}

func (err ErrRepoFilesAlreadyExist) Error() string {
	return fmt.Sprintf("repository files already exist [uname: %s, name: %s]", err.Uname, err.Name)
}

// CheckCreateRepository check if could created a repository
func CheckCreateRepository(doer, u *user_model.User, name string, overwriteOrAdopt bool) error {
	if !doer.CanCreateRepo() {
		return ErrReachLimitOfRepo{u.MaxRepoCreation}
	}

	if err := IsUsableRepoName(name); err != nil {
		return err
	}

	has, err := IsRepositoryExist(db.DefaultContext, u, name)
	if err != nil {
		return fmt.Errorf("IsRepositoryExist: %v", err)
	} else if has {
		return ErrRepoAlreadyExist{u.Name, name}
	}

	repoPath := RepoPath(u.Name, name)
	isExist, err := util.IsExist(repoPath)
	if err != nil {
		log.Error("Unable to check if %s exists. Error: %v", repoPath, err)
		return err
	}
	if !overwriteOrAdopt && isExist {
		return ErrRepoFilesAlreadyExist{u.Name, name}
	}
	return nil
}

// ChangeRepositoryName changes all corresponding setting from old repository name to new one.
func ChangeRepositoryName(doer *user_model.User, repo *Repository, newRepoName string) (err error) {
	oldRepoName := repo.Name
	newRepoName = strings.ToLower(newRepoName)
	if err = IsUsableRepoName(newRepoName); err != nil {
		return err
	}

	if err := repo.GetOwner(db.DefaultContext); err != nil {
		return err
	}

	has, err := IsRepositoryExist(db.DefaultContext, repo.Owner, newRepoName)
	if err != nil {
		return fmt.Errorf("IsRepositoryExist: %v", err)
	} else if has {
		return ErrRepoAlreadyExist{repo.Owner.Name, newRepoName}
	}

	newRepoPath := RepoPath(repo.Owner.Name, newRepoName)
	if err = util.Rename(repo.RepoPath(), newRepoPath); err != nil {
		return fmt.Errorf("rename repository directory: %v", err)
	}

	wikiPath := repo.WikiPath()
	isExist, err := util.IsExist(wikiPath)
	if err != nil {
		log.Error("Unable to check if %s exists. Error: %v", wikiPath, err)
		return err
	}
	if isExist {
		if err = util.Rename(wikiPath, WikiPath(repo.Owner.Name, newRepoName)); err != nil {
			return fmt.Errorf("rename repository wiki: %v", err)
		}
	}

	ctx, committer, err := db.TxContext()
	if err != nil {
		return err
	}
	defer committer.Close()

	if err := NewRedirect(ctx, repo.Owner.ID, repo.ID, oldRepoName, newRepoName); err != nil {
		return err
	}

	return committer.Commit()
}
