// 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 space

import (
	"context"
	"fmt"

	"github.com/harness/gitness/app/api/usererror"
	"github.com/harness/gitness/app/auth"
	"github.com/harness/gitness/app/services/importer"
	"github.com/harness/gitness/types"
)

type ImportInput struct {
	CreateInput
	Provider      importer.Provider `json:"provider"`
	ProviderSpace string            `json:"provider_space"`
}

// Import creates new space and starts import of all repositories from the remote provider's space into it.
func (c *Controller) Import(ctx context.Context, session *auth.Session, in *ImportInput) (*types.Space, error) {
	parentSpaceID, err := c.getSpaceCheckAuthSpaceCreation(ctx, session, in.ParentRef)
	if err != nil {
		return nil, err
	}

	if in.UID == "" {
		in.UID = in.ProviderSpace
	}

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

	remoteRepositories, err := importer.LoadRepositoriesFromProviderSpace(ctx, in.Provider, in.ProviderSpace)
	if err != nil {
		return nil, err
	}

	if len(remoteRepositories) == 0 {
		return nil, usererror.BadRequestf("found no repositories at %s", in.ProviderSpace)
	}

	repoIDs := make([]int64, len(remoteRepositories))
	cloneURLs := make([]string, len(remoteRepositories))

	var space *types.Space
	err = c.tx.WithTx(ctx, func(ctx context.Context) error {
		space, err = c.createSpaceInnerInTX(ctx, session, parentSpaceID, &in.CreateInput)
		if err != nil {
			return err
		}

		for i, remoteRepository := range remoteRepositories {
			repo := remoteRepository.ToRepo(
				space.ID, remoteRepository.UID, "", &session.Principal)

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

			repoIDs[i] = repo.ID
			cloneURLs[i] = remoteRepository.CloneURL
		}

		jobGroupID := fmt.Sprintf("space-import-%d", space.ID)
		err = c.importer.RunMany(ctx, jobGroupID, in.Provider, repoIDs, cloneURLs)
		if err != nil {
			return fmt.Errorf("failed to start import repository jobs: %w", err)
		}

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

	return space, nil
}