// Copyright 2023 Harness, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package repo

import (
	"context"
	"fmt"

	"github.com/harness/gitness/app/auth"
	"github.com/harness/gitness/app/services/importer"
	"github.com/harness/gitness/store/database/dbtx"
	"github.com/harness/gitness/types"
)

type ImportInput struct {
	ParentRef   string `json:"parent_ref"`
	UID         string `json:"uid"`
	Description string `json:"description"`

	Provider     importer.Provider `json:"provider"`
	ProviderRepo string            `json:"provider_repo"`
}

// Import creates a new empty repository and starts git import to it from a remote repository.
func (c *Controller) Import(ctx context.Context, session *auth.Session, in *ImportInput) (*types.Repository, error) {
	parentSpace, err := c.getSpaceCheckAuthRepoCreation(ctx, session, in.ParentRef)
	if err != nil {
		return nil, err
	}

	err = c.sanitizeImportInput(in)
	if err != nil {
		return nil, fmt.Errorf("failed to sanitize input: %w", err)
	}

	remoteRepository, err := importer.LoadRepositoryFromProvider(ctx, in.Provider, in.ProviderRepo)
	if err != nil {
		return nil, err
	}

	var repo *types.Repository
	err = dbtx.New(c.db).WithTx(ctx, func(ctx context.Context) error {
		repo = remoteRepository.ToRepo(parentSpace.ID, in.UID, in.Description, &session.Principal)

		err = c.repoStore.Create(ctx, repo)
		if err != nil {
			return fmt.Errorf("failed to create repository in storage: %w", err)
		}

		err = c.importer.Run(ctx, in.Provider, repo, remoteRepository.CloneURL)
		if err != nil {
			return fmt.Errorf("failed to start import repository job: %w", err)
		}

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

	repo.GitURL = c.urlProvider.GenerateGITCloneURL(repo.Path)

	return repo, nil
}

func (c *Controller) sanitizeImportInput(in *ImportInput) error {
	if err := c.validateParentRef(in.ParentRef); err != nil {
		return err
	}

	if err := c.uidCheck(in.UID, false); err != nil {
		return err
	}

	return nil
}