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// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package repository

import (
	"context"

	"code.gitea.io/gitea/models/db"
	issues_model "code.gitea.io/gitea/models/issues"
	repo_model "code.gitea.io/gitea/models/repo"
	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/notification"
	repo_module "code.gitea.io/gitea/modules/repository"
)

// GenerateIssueLabels generates issue labels from a template repository
func GenerateIssueLabels(ctx context.Context, templateRepo, generateRepo *repo_model.Repository) error {
	templateLabels, err := issues_model.GetLabelsByRepoID(ctx, templateRepo.ID, "", db.ListOptions{})
	if err != nil {
		return err
	}
	// Prevent insert being called with an empty slice which would result in
	// err "no element on slice when insert".
	if len(templateLabels) == 0 {
		return nil
	}

	newLabels := make([]*issues_model.Label, 0, len(templateLabels))
	for _, templateLabel := range templateLabels {
		newLabels = append(newLabels, &issues_model.Label{
			RepoID:      generateRepo.ID,
			Name:        templateLabel.Name,
			Exclusive:   templateLabel.Exclusive,
			Description: templateLabel.Description,
			Color:       templateLabel.Color,
		})
	}
	return db.Insert(ctx, newLabels)
}

// GenerateRepository generates a repository from a template
func GenerateRepository(ctx context.Context, doer, owner *user_model.User, templateRepo *repo_model.Repository, opts repo_module.GenerateRepoOptions) (_ *repo_model.Repository, err error) {
	if !doer.IsAdmin && !owner.CanCreateRepo() {
		return nil, repo_model.ErrReachLimitOfRepo{
			Limit: owner.MaxRepoCreation,
		}
	}

	var generateRepo *repo_model.Repository
	if err = db.WithTx(ctx, func(ctx context.Context) error {
		generateRepo, err = repo_module.GenerateRepository(ctx, doer, owner, templateRepo, opts)
		if err != nil {
			return err
		}

		// Git Content
		if opts.GitContent && !templateRepo.IsEmpty {
			if err = repo_module.GenerateGitContent(ctx, templateRepo, generateRepo); err != nil {
				return err
			}
		}

		// Topics
		if opts.Topics {
			if err = repo_model.GenerateTopics(ctx, templateRepo, generateRepo); err != nil {
				return err
			}
		}

		// Git Hooks
		if opts.GitHooks {
			if err = GenerateGitHooks(ctx, templateRepo, generateRepo); err != nil {
				return err
			}
		}

		// Webhooks
		if opts.Webhooks {
			if err = GenerateWebhooks(ctx, templateRepo, generateRepo); err != nil {
				return err
			}
		}

		// Avatar
		if opts.Avatar && len(templateRepo.Avatar) > 0 {
			if err = generateAvatar(ctx, templateRepo, generateRepo); err != nil {
				return err
			}
		}

		// Issue Labels
		if opts.IssueLabels {
			if err = GenerateIssueLabels(ctx, templateRepo, generateRepo); err != nil {
				return err
			}
		}

		return nil
	}); err != nil {
		return nil, err
	}

	notification.NotifyCreateRepository(ctx, doer, owner, generateRepo)

	return generateRepo, nil
}