// 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/api/controller"
	"github.com/harness/gitness/app/auth"
	"github.com/harness/gitness/git"
	"github.com/harness/gitness/types"
	"github.com/harness/gitness/types/enum"
)

// GetBranch gets a repo branch.
func (c *Controller) GetBranch(ctx context.Context,
	session *auth.Session,
	repoRef string,
	branchName string,
	options types.BranchMetadataOptions,
) (*types.BranchExtended, error) {
	repo, err := c.getRepoCheckAccess(ctx, session, repoRef, enum.PermissionRepoView)
	if err != nil {
		return nil, err
	}

	rpcOut, err := c.git.GetBranch(ctx, &git.GetBranchParams{
		ReadParams: git.CreateReadParams(repo),
		BranchName: branchName,
	})
	if err != nil {
		return nil, fmt.Errorf("failed to get branch: %w", err)
	}

	metadata, err := c.collectBranchMetadata(ctx, repo, []git.Branch{rpcOut.Branch}, options)
	if err != nil {
		return nil, fmt.Errorf("fail to collect branch metadata: %w", err)
	}

	branch, err := controller.MapBranch(rpcOut.Branch)
	if err != nil {
		return nil, fmt.Errorf("failed to map branch: %w", err)
	}

	branchExtended := &types.BranchExtended{
		Branch:    branch,
		IsDefault: branchName == repo.DefaultBranch,
	}

	metadata.apply(0, branchExtended)

	return branchExtended, nil
}