// Copyright 2019 Drone IO, 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 trigger

// import (
// 	"context"
// 	"regexp"
// 	"strconv"

// 	"github.com/drone/drone/core"
// 	"github.com/drone/go-scm/scm"
// )

// func listChanges(client *scm.Client, repo *core.Repository, build *core.Build) ([]string, error) {
// 	switch build.Event {
// 	case core.EventPullRequest:
// 		return listChangesPullRequest(client, repo, build)
// 	case core.EventPush:
// 		return listChangesPush(client, repo, build)
// 	default:
// 		return nil, nil
// 	}
// }

// func listChangesPullRequest(client *scm.Client, repo *core.Repository, build *core.Build) ([]string, error) {
// 	var paths []string
// 	pr, err := parsePullRequest(build.Ref)
// 	if err != nil {
// 		return nil, err
// 	}
// 	change, _, err := client.PullRequests.ListChanges(context.Background(), repo.Slug, pr, scm.ListOptions{})
// 	if err == nil {
// 		for _, file := range change {
// 			paths = append(paths, file.Path)
// 		}
// 	}
// 	return paths, err
// }

// func listChangesPush(client *scm.Client, repo *core.Repository, build *core.Build) ([]string, error) {
// 	var paths []string
// 	// TODO (bradrydzewski) some tag hooks provide the tag but do
// 	// not provide the sha, in which case we should use the ref
// 	// instead of the sha.
// 	change, _, err := client.Git.ListChanges(context.Background(), repo.Slug, build.After, scm.ListOptions{})
// 	if err == nil {
// 		for _, file := range change {
// 			paths = append(paths, file.Path)
// 		}
// 	}
// 	return paths, err
// }

// func parsePullRequest(ref string) (int, error) {
// 	return strconv.Atoi(
// 		pre.FindString(ref),
// 	)
// }

// var pre = regexp.MustCompile("\\d+")