// Copyright (c) 2020 Gitpod GmbH. All rights reserved.
// Licensed under the GNU Affero General Public License (AGPL).
// See License-AGPL.txt in the project root for license information.

package config

import (
	"context"
	"fmt"
	"os"
	"testing"

	"github.com/google/go-cmp/cmp"
	"github.com/sirupsen/logrus"
	"golang.org/x/sync/errgroup"

	gitpod "github.com/gitpod-io/gitpod/gitpod-protocol"
)

var log = logrus.NewEntry(logrus.StandardLogger())

func TestGitpodConfig(t *testing.T) {
	tests := []struct {
		Desc        string
		Content     string
		Expectation *gitpod.GitpodConfig
	}{
		{
			Desc: "parsing",
			Content: `
image: eu.gcr.io/gitpod-core-dev/dev/dev-environment:pd-upgrade-dev-image.1
workspaceLocation: gitpod/gitpod-ws.code-workspace
checkoutLocation: gitpod
ports:
  - port: 1337
    onOpen: open-preview
  - port: 3000
    onOpen: ignore
tasks:
  - before: scripts/branch-namespace.sh
    init: yarn --network-timeout 100000 && yarn build
  - name: Go
    init: leeway exec --filter-type go -v -- go get -v ./...
    openMode: split-right
vscode:
  extensions:
    - hangxingliu.vscode-nginx-conf-hint@0.1.0:UATTe2sTFfCYWQ3jw4IRsw==
    - zxh404.vscode-proto3@0.4.2:ZnPmyF/Pb8AIWeCqc83gPw==`,
			Expectation: &gitpod.GitpodConfig{
				Image:             "eu.gcr.io/gitpod-core-dev/dev/dev-environment:pd-upgrade-dev-image.1",
				WorkspaceLocation: "gitpod/gitpod-ws.code-workspace",
				CheckoutLocation:  "gitpod",
				Ports: []*gitpod.PortsItems{
					{
						Port:   1337,
						OnOpen: "open-preview",
					}, {
						Port:   3000,
						OnOpen: "ignore",
					},
				},
				Tasks: []*gitpod.TasksItems{
					{
						Before: "scripts/branch-namespace.sh",
						Init:   "yarn --network-timeout 100000 && yarn build",
					},
					{
						Name:     "Go",
						Init:     "leeway exec --filter-type go -v -- go get -v ./...",
						OpenMode: "split-right",
					},
				},
				Vscode: &gitpod.Vscode{
					Extensions: []string{
						"hangxingliu.vscode-nginx-conf-hint@0.1.0:UATTe2sTFfCYWQ3jw4IRsw==",
						"zxh404.vscode-proto3@0.4.2:ZnPmyF/Pb8AIWeCqc83gPw==",
					},
				},
			},
		},
	}
	for _, test := range tests {
		t.Run(test.Desc, func(t *testing.T) {
			tempDir, err := os.MkdirTemp("", "test-gitpor-config-*")
			if err != nil {
				t.Fatal(err)
			}
			defer os.RemoveAll(tempDir)

			locationReady := make(chan struct{})
			configService := NewConfigService(tempDir+"/.gitpod.yml", locationReady, log)
			ctx, cancel := context.WithCancel(context.Background())
			defer cancel()
			close(locationReady)

			go configService.Watch(ctx)

			var listeners []<-chan *gitpod.GitpodConfig
			for i := 0; i < 10; i++ {
				listeners = append(listeners, configService.Observe(ctx))
			}

			for i := 0; i < 2; i++ {
				eg, _ := errgroup.WithContext(ctx)
				for _, listener := range listeners {
					l := listener
					eg.Go(func() error {
						config := <-l
						if diff := cmp.Diff((*gitpod.GitpodConfig)(nil), config); diff != "" {
							return fmt.Errorf("unexpected output (-want +got):\n%s", diff)
						}
						return nil
					})
				}
				err = eg.Wait()
				if err != nil {
					t.Fatal(err)
				}

				err = os.WriteFile(configService.location, []byte(test.Content), 0o600)
				if err != nil {
					t.Fatal(err)
				}

				eg, _ = errgroup.WithContext(ctx)
				for _, listener := range listeners {
					l := listener
					eg.Go(func() error {
						config := <-l
						if diff := cmp.Diff(test.Expectation, config); diff != "" {
							return fmt.Errorf("unexpected output (-want +got):\n%s", diff)
						}
						return nil
					})
				}
				err = eg.Wait()
				if err != nil {
					t.Fatal(err)
				}

				err = os.Remove(configService.location)
				if err != nil {
					t.Fatal(err)
				}
			}
		})
	}
}