// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package gitiles

import (
	"context"
	"testing"

	"github.com/golang/mock/gomock"
	"go.chromium.org/luci/common/proto/git"
	gitilespb "go.chromium.org/luci/common/proto/gitiles"
	"go.chromium.org/luci/common/proto/gitiles/mock_gitiles"

	"github.com/google/go-cmp/cmp"
)

func TestLatestCommit(t *testing.T) {
	t.Parallel()
	tests := []struct {
		project  string
		expected string
	}{
		{
			project:  "test-project",
			expected: "foobar",
		},
	}
	for _, test := range tests {
		ctrl := gomock.NewController(t)
		defer ctrl.Finish()
		mockGitilesClient := mock_gitiles.NewMockGitilesClient(ctrl)
		req := gitilespb.LogRequest{
			Project:    test.project,
			Committish: "refs/heads/main",
			PageSize:   1,
		}
		// Client returns a successful Log response.
		resp := gitilespb.LogResponse{
			Log: []*git.Commit{{Id: "foobar"}},
		}
		mockGitilesClient.EXPECT().Log(gomock.Any(), &req).Return(&resp, nil)
		mockGitilesClientWrapper := Client{
			client:  mockGitilesClient,
			project: test.project,
		}
		ctx := context.Background()
		commit, err := mockGitilesClientWrapper.LatestCommit(ctx, "refs/heads/main")
		if err != nil {
			t.Fatal(err)
		}
		if test.expected != commit {
			t.Fatalf("expected: %s\nactual: %s\n", test.expected, commit)
		}
	}
}

func TestLog(t *testing.T) {
	t.Parallel()
	tests := []struct {
		project  string
		expected []*git.Commit
	}{
		{
			project: "test-project",
			expected: []*git.Commit{
				{
					Id: "c",
				},
				{
					Id: "b",
				},
				{
					Id: "a",
				},
			},
		},
	}
	for _, test := range tests {
		ctrl := gomock.NewController(t)
		defer ctrl.Finish()
		mockGitilesClient := mock_gitiles.NewMockGitilesClient(ctrl)
		req := gitilespb.LogRequest{
			Project:    test.project,
			Committish: test.expected[0].Id,
			PageSize:   int32(len(test.expected)),
		}
		// Client returns a successful Log response.
		resp := gitilespb.LogResponse{
			Log: test.expected,
		}
		mockGitilesClient.EXPECT().Log(gomock.Any(), &req).Return(&resp, nil)
		mockGitilesClientWrapper := Client{
			client:  mockGitilesClient,
			project: test.project,
		}
		ctx := context.Background()
		log, err := mockGitilesClientWrapper.Log(ctx, test.expected[0].Id, int32(len(test.expected)))
		if err != nil {
			t.Fatal(err)
		}
		if diff := cmp.Diff(test.expected, log, cmp.Comparer(func(x, y *git.Commit) bool {
			return x.Id == y.Id
		})); diff != "" {
			t.Fatalf("different (-want +got):\n%s", diff)
		}
	}
}

func TestDownloadFile(t *testing.T) {
	t.Parallel()
	tests := []struct {
		project  string
		path     string
		ref      string
		expected string
	}{
		{
			project:  "test-project",
			path:     "a/b/c.txt",
			ref:      "foo",
			expected: "file contents",
		},
	}
	for _, test := range tests {
		ctrl := gomock.NewController(t)
		defer ctrl.Finish()
		mockGitilesClient := mock_gitiles.NewMockGitilesClient(ctrl)
		req := gitilespb.DownloadFileRequest{
			Project:    test.project,
			Committish: test.ref,
			Path:       test.path,
		}
		// Client returns a successful DownloadFile response.
		resp := gitilespb.DownloadFileResponse{
			Contents: test.expected,
		}
		mockGitilesClient.EXPECT().DownloadFile(gomock.Any(), &req).Return(&resp, nil)
		mockGitilesClientWrapper := Client{
			client:  mockGitilesClient,
			project: test.project,
		}
		ctx := context.Background()
		contents, err := mockGitilesClientWrapper.DownloadFile(ctx, test.path, test.ref)
		if err != nil {
			t.Fatal(err)
		}
		if contents != test.expected {
			t.Fatalf("expected: %s\nactual: %s\n", test.expected, contents)
		}
	}
}