// Copyright 2019 The Gitea Authors. All rights reserved.
// Copyright 2018 Jonas Franz. All rights reserved.
// SPDX-License-Identifier: MIT

package migrations

import (
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"runtime"
	"slices"
	"strconv"
	"strings"
	"testing"
	"time"

	"gitea.dev/models/unittest"
	base "gitea.dev/modules/migration"

	"github.com/google/go-github/v92/github"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestGithubIssuePagination(t *testing.T) {
	for _, tc := range []struct {
		name  string
		pages []string
	}{
		{name: "offset", pages: []string{"page=1", "page=2", "page=3"}},
		{name: "cursor", pages: []string{"page=1", "after=cursor-2", "after=cursor-3"}},
		{name: "switch to cursor", pages: []string{"page=1", "page=2", "after=cursor-3"}},
	} {
		t.Run(tc.name, func(t *testing.T) {
			var requests []string
			failReaction := true
			issue := func(number int) string {
				return fmt.Sprintf(`{"number":%d,"title":"Issue","user":{},"created_at":"2026-01-01T00:00:00Z","updated_at":"2026-01-01T00:00:00Z"}`, number)
			}
			responses := []string{
				"[" + issue(1) + `,{"pull_request":{}}]`,
				`[{"pull_request":{}}]`,
				"[" + issue(4) + "," + issue(5) + "]",
			}
			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				w.Header().Set("Content-Type", "application/json")
				w.Header().Set("X-RateLimit-Remaining", "100")
				if r.URL.Path == "/api/v3/repos/o/r/issues/4/reactions" && failReaction {
					failReaction = false
					w.WriteHeader(http.StatusBadRequest)
					_, _ = w.Write([]byte(`{"message":"temporary failure"}`))
					return
				}
				if r.URL.Path != "/api/v3/repos/o/r/issues" {
					_, _ = w.Write([]byte(`[]`))
					return
				}
				query := r.URL.Query()
				assert.Equal(t, "2", query.Get("per_page"))
				assert.Equal(t, "all", query.Get("state"))
				assert.Equal(t, "created", query.Get("sort"))
				assert.Equal(t, "asc", query.Get("direction"))
				query.Del("per_page")
				query.Del("state")
				query.Del("sort")
				query.Del("direction")
				pagination := query.Encode()
				requests = append(requests, pagination)
				page := slices.Index(tc.pages, pagination)
				if page < 0 {
					w.WriteHeader(http.StatusUnprocessableEntity)
					_, _ = w.Write([]byte(`{"message":"unexpected pagination"}`))
					return
				}
				if page+1 < len(tc.pages) {
					w.Header().Set("Link", fmt.Sprintf(`<https://api.github.com/repos/o/r/issues?per_page=2&%s>; rel="next"`, tc.pages[page+1]))
				}
				_, _ = w.Write([]byte(responses[page]))
			}))
			defer server.Close()

			downloader, err := NewGithubDownloaderV3(t.Context(), server.URL, "", "", "", "o", "r")
			require.NoError(t, err)
			issues, isEnd, err := downloader.GetIssues(t.Context(), 1, 2)
			require.NoError(t, err)
			require.Len(t, issues, 1)
			assert.EqualValues(t, 1, issues[0].Number)
			assert.False(t, isEnd)

			for range 2 {
				issues, isEnd, err = downloader.GetIssues(t.Context(), 2, 2)
				require.NoError(t, err)
				assert.Empty(t, issues)
				assert.False(t, isEnd)
			}

			_, _, err = downloader.GetIssues(t.Context(), 3, 2)
			require.Error(t, err)
			for range 2 {
				issues, isEnd, err = downloader.GetIssues(t.Context(), 3, 2)
				require.NoError(t, err)
				require.Len(t, issues, 2)
				assert.EqualValues(t, 4, issues[0].Number)
				assert.EqualValues(t, 5, issues[1].Number)
				assert.True(t, isEnd)
			}

			_, isEnd, err = downloader.GetIssues(t.Context(), 1, 2)
			require.NoError(t, err)
			assert.False(t, isEnd)
			issues, isEnd, err = downloader.GetIssues(t.Context(), 2, 2)
			require.NoError(t, err)
			assert.Empty(t, issues)
			assert.False(t, isEnd)
			assert.Equal(t, []string{tc.pages[0], tc.pages[1], tc.pages[1], tc.pages[2], tc.pages[2], tc.pages[2], tc.pages[0], tc.pages[1]}, requests)
		})
	}
}

func TestGitHubDownloadRepo(t *testing.T) {
	token := os.Getenv("GITHUB_READ_TOKEN")
	liveMode := token != ""

	_, callerFile, _, _ := runtime.Caller(0)
	fixtureDir := filepath.Join(filepath.Dir(callerFile), "_mock_data/TestGitHubDownloadRepo")
	mockServer := unittest.NewMockWebServer(t, "https://api.github.com", fixtureDir, liveMode, unittest.MockServerOptions{
		StripPrefix: "/api/v3",
	})

	GithubLimitRateRemaining = 3 // Wait at 3 remaining since we could have 3 CI in //
	ctx := t.Context()
	downloader, err := NewGithubDownloaderV3(ctx, mockServer.URL, "", "", token, "go-gitea", "test_repo")
	require.NoError(t, err)
	err = downloader.RefreshRate(ctx)
	require.NoError(t, err)

	repo, err := downloader.GetRepoInfo(ctx)
	assert.NoError(t, err)
	assertRepositoryEqual(t, &base.Repository{
		Name:          "test_repo",
		Owner:         "go-gitea",
		Description:   "Test repository for testing migration from github to gitea",
		Website:       "https://gitea.com/test-repo",
		CloneURL:      "https://github.com/go-gitea/test_repo.git",
		OriginalURL:   "https://github.com/go-gitea/test_repo",
		DefaultBranch: "master",
	}, repo)

	topics, err := downloader.GetTopics(ctx)
	assert.NoError(t, err)
	assert.Contains(t, topics, "gitea")

	milestones, err := downloader.GetMilestones(ctx)
	assert.NoError(t, err)
	assertMilestonesEqual(t, []*base.Milestone{
		{
			Title:       "1.0.0",
			Description: "Milestone 1.0.0",
			Deadline:    new(time.Date(2019, 11, 11, 0, 0, 0, 0, time.UTC)),
			Created:     time.Date(2019, 11, 12, 19, 37, 8, 0, time.UTC),
			Updated:     new(time.Date(2019, 11, 12, 21, 56, 17, 0, time.UTC)),
			Closed:      new(time.Date(2019, 11, 12, 19, 45, 49, 0, time.UTC)),
			State:       "closed",
		},
		{
			Title:       "1.1.0",
			Description: "Milestone 1.1.0",
			Deadline:    new(time.Date(2019, 11, 12, 0, 0, 0, 0, time.UTC)),
			Created:     time.Date(2019, 11, 12, 19, 37, 25, 0, time.UTC),
			Updated:     new(time.Date(2019, 11, 12, 21, 39, 27, 0, time.UTC)),
			Closed:      new(time.Date(2019, 11, 12, 19, 45, 46, 0, time.UTC)),
			State:       "closed",
		},
	}, milestones)

	labels, err := downloader.GetLabels(ctx)
	assert.NoError(t, err)
	assertLabelsEqual(t, []*base.Label{
		{
			Name:        "bug",
			Color:       "d73a4a",
			Description: "Something isn't working",
		},
		{
			Name:        "documentation",
			Color:       "0075ca",
			Description: "Improvements or additions to documentation",
		},
		{
			Name:        "duplicate",
			Color:       "cfd3d7",
			Description: "This issue or pull request already exists",
		},
		{
			Name:        "enhancement",
			Color:       "a2eeef",
			Description: "New feature or request",
		},
		{
			Name:        "good first issue",
			Color:       "7057ff",
			Description: "Good for newcomers",
		},
		{
			Name:        "help wanted",
			Color:       "008672",
			Description: "Extra attention is needed",
		},
		{
			Name:        "invalid",
			Color:       "e4e669",
			Description: "This doesn't seem right",
		},
		{
			Name:        "question",
			Color:       "d876e3",
			Description: "Further information is requested",
		},
		{
			Name:        "wontfix",
			Color:       "ffffff",
			Description: "This will not be worked on",
		},
	}, labels)

	releases, err := downloader.GetReleases(ctx)
	assert.NoError(t, err)
	assertReleasesEqual(t, []*base.Release{
		{
			TagName:         "v0.9.99",
			TargetCommitish: "master",
			Name:            "First Release",
			Body:            "A test release",
			Created:         time.Date(2019, 11, 9, 16, 49, 21, 0, time.UTC),
			Published:       time.Date(2019, 11, 12, 20, 12, 10, 0, time.UTC),
			PublisherID:     1669571,
			PublisherName:   "mrsdizzie",
		},
	}, releases)

	// downloader.GetIssues()
	issues, isEnd, err := downloader.GetIssues(ctx, 1, 2)
	assert.NoError(t, err)
	assert.False(t, isEnd)
	assertIssuesEqual(t, []*base.Issue{
		{
			Number:     1,
			Title:      "Please add an animated gif icon to the merge button",
			Content:    "I just want the merge button to hurt my eyes a little. \xF0\x9F\x98\x9D ",
			Milestone:  "1.0.0",
			PosterID:   18600385,
			PosterName: "guillep2k",
			State:      "closed",
			Created:    time.Date(2019, 11, 9, 17, 0, 29, 0, time.UTC),
			Updated:    time.Date(2019, 11, 12, 20, 29, 53, 0, time.UTC),
			Labels: []*base.Label{
				{
					Name:        "bug",
					Color:       "d73a4a",
					Description: "Something isn't working",
				},
				{
					Name:        "good first issue",
					Color:       "7057ff",
					Description: "Good for newcomers",
				},
			},
			Reactions: []*base.Reaction{
				{
					UserID:   1669571,
					UserName: "mrsdizzie",
					Content:  "+1",
				},
			},
			Closed: new(time.Date(2019, 11, 12, 20, 22, 22, 0, time.UTC)),
		},
		{
			Number:     2,
			Title:      "Test issue",
			Content:    "This is test issue 2, do not touch!",
			Milestone:  "1.1.0",
			PosterID:   1669571,
			PosterName: "mrsdizzie",
			State:      "closed",
			Created:    time.Date(2019, 11, 12, 21, 0, 6, 0, time.UTC),
			Updated:    time.Date(2019, 11, 12, 22, 7, 14, 0, time.UTC),
			Labels: []*base.Label{
				{
					Name:        "duplicate",
					Color:       "cfd3d7",
					Description: "This issue or pull request already exists",
				},
			},
			Reactions: []*base.Reaction{
				{
					UserID:   1669571,
					UserName: "mrsdizzie",
					Content:  "heart",
				},
				{
					UserID:   1669571,
					UserName: "mrsdizzie",
					Content:  "laugh",
				},
				{
					UserID:   1669571,
					UserName: "mrsdizzie",
					Content:  "-1",
				},
				{
					UserID:   1669571,
					UserName: "mrsdizzie",
					Content:  "confused",
				},
				{
					UserID:   1669571,
					UserName: "mrsdizzie",
					Content:  "hooray",
				},
				{
					UserID:   1669571,
					UserName: "mrsdizzie",
					Content:  "+1",
				},
			},
			Closed: new(time.Date(2019, 11, 12, 21, 1, 31, 0, time.UTC)),
		},
	}, issues)

	// downloader.GetComments()
	comments, _, err := downloader.GetComments(ctx, &base.Issue{Number: 2, ForeignIndex: 2})
	assert.NoError(t, err)
	assertCommentsEqual(t, []*base.Comment{
		{
			IssueIndex: 2,
			PosterID:   1669571,
			PosterName: "mrsdizzie",
			Created:    time.Date(2019, 11, 12, 21, 0, 13, 0, time.UTC),
			Updated:    time.Date(2019, 11, 12, 21, 0, 13, 0, time.UTC),
			Content:    "This is a comment",
			Reactions: []*base.Reaction{
				{
					UserID:   1669571,
					UserName: "mrsdizzie",
					Content:  "+1",
				},
			},
		},
		{
			IssueIndex: 2,
			PosterID:   1669571,
			PosterName: "mrsdizzie",
			Created:    time.Date(2019, 11, 12, 22, 7, 14, 0, time.UTC),
			Updated:    time.Date(2019, 11, 12, 22, 7, 14, 0, time.UTC),
			Content:    "A second comment",
			Reactions:  nil,
		},
	}, comments)

	// downloader.GetPullRequests()
	prs, _, err := downloader.GetPullRequests(ctx, 1, 2)
	assert.NoError(t, err)
	assertPullRequestsEqual(t, []*base.PullRequest{
		{
			Number:     3,
			Title:      "Update README.md",
			Content:    "add warning to readme",
			Milestone:  "1.1.0",
			PosterID:   1669571,
			PosterName: "mrsdizzie",
			State:      "closed",
			Created:    time.Date(2019, 11, 12, 21, 21, 43, 0, time.UTC),
			Updated:    time.Date(2019, 11, 12, 21, 39, 28, 0, time.UTC),
			Labels: []*base.Label{
				{
					Name:        "documentation",
					Color:       "0075ca",
					Description: "Improvements or additions to documentation",
				},
			},
			PatchURL: "",
			Head: base.PullRequestBranch{
				Ref:      "master",
				CloneURL: "",
				SHA:      "076160cf0b039f13e5eff19619932d181269414b",
				RepoName: "test_repo",

				OwnerName: "mrsdizzie",
			},
			Base: base.PullRequestBranch{
				Ref:       "master",
				SHA:       "72866af952e98d02a73003501836074b286a78f6",
				OwnerName: "go-gitea",
				RepoName:  "test_repo",
			},
			Closed:         new(time.Date(2019, 11, 12, 21, 39, 27, 0, time.UTC)),
			Merged:         true,
			MergedTime:     new(time.Date(2019, 11, 12, 21, 39, 27, 0, time.UTC)),
			MergeCommitSHA: "f32b0a9dfd09a60f616f29158f772cedd89942d2",
			ForeignIndex:   3,
		},
		{
			Number:     4,
			Title:      "Test branch",
			Content:    "do not merge this PR",
			Milestone:  "1.0.0",
			PosterID:   1669571,
			PosterName: "mrsdizzie",
			State:      "open",
			Created:    time.Date(2019, 11, 12, 21, 54, 18, 0, time.UTC),
			Updated:    time.Date(2025, 3, 16, 15, 46, 20, 0, time.UTC),
			Labels: []*base.Label{
				{
					Name:        "bug",
					Color:       "d73a4a",
					Description: "Something isn't working",
				},
			},
			PatchURL: "",
			Head: base.PullRequestBranch{
				Ref:       "test-branch",
				SHA:       "2be9101c543658591222acbee3eb799edfc3853d",
				RepoName:  "test_repo",
				OwnerName: "mrsdizzie",
				CloneURL:  "",
			},
			Base: base.PullRequestBranch{
				Ref:       "master",
				SHA:       "f32b0a9dfd09a60f616f29158f772cedd89942d2",
				OwnerName: "go-gitea",
				RepoName:  "test_repo",
			},
			Merged:         false,
			MergeCommitSHA: "565d1208f5fffdc1c5ae1a2436491eb9a5e4ebae",
			Reactions: []*base.Reaction{
				{
					UserID:   81045,
					UserName: "lunny",
					Content:  "heart",
				},
				{
					UserID:   81045,
					UserName: "lunny",
					Content:  "+1",
				},
			},
			ForeignIndex: 4,
		},
	}, prs)

	reviews, err := downloader.GetReviews(ctx, &base.PullRequest{Number: 3, ForeignIndex: 3})
	assert.NoError(t, err)
	assertReviewsEqual(t, []*base.Review{
		{
			ID:           315859956,
			IssueIndex:   3,
			ReviewerID:   42128690,
			ReviewerName: "jolheiser",
			CommitID:     "076160cf0b039f13e5eff19619932d181269414b",
			CreatedAt:    time.Date(2019, 11, 12, 21, 35, 24, 0, time.UTC),
			State:        base.ReviewStateApproved,
		},
		{
			ID:           315860062,
			IssueIndex:   3,
			ReviewerID:   1824502,
			ReviewerName: "zeripath",
			CommitID:     "076160cf0b039f13e5eff19619932d181269414b",
			CreatedAt:    time.Date(2019, 11, 12, 21, 35, 36, 0, time.UTC),
			State:        base.ReviewStateApproved,
		},
		{
			ID:           315861440,
			IssueIndex:   3,
			ReviewerID:   165205,
			ReviewerName: "lafriks",
			CommitID:     "076160cf0b039f13e5eff19619932d181269414b",
			CreatedAt:    time.Date(2019, 11, 12, 21, 38, 0, 0, time.UTC),
			State:        base.ReviewStateApproved,
		},
	}, reviews)

	reviews, err = downloader.GetReviews(ctx, &base.PullRequest{Number: 4, ForeignIndex: 4})
	assert.NoError(t, err)
	assertReviewsEqual(t, []*base.Review{
		{
			ID:           338338740,
			IssueIndex:   4,
			ReviewerID:   81045,
			ReviewerName: "lunny",
			CommitID:     "2be9101c543658591222acbee3eb799edfc3853d",
			CreatedAt:    time.Date(2020, 1, 4, 5, 33, 18, 0, time.UTC),
			State:        base.ReviewStateApproved,
			Comments: []*base.ReviewComment{
				{
					ID:        363017488,
					Content:   "This is a good pull request.",
					TreePath:  "README.md",
					DiffHunk:  "@@ -1,2 +1,4 @@\n # test_repo\n Test repository for testing migration from github to gitea\n+",
					Position:  3,
					CommitID:  "2be9101c543658591222acbee3eb799edfc3853d",
					PosterID:  81045,
					CreatedAt: time.Date(2020, 1, 4, 5, 33, 6, 0, time.UTC),
					UpdatedAt: time.Date(2020, 1, 4, 5, 33, 18, 0, time.UTC),
				},
			},
		},
		{
			ID:           338339651,
			IssueIndex:   4,
			ReviewerID:   81045,
			ReviewerName: "lunny",
			CommitID:     "2be9101c543658591222acbee3eb799edfc3853d",
			CreatedAt:    time.Date(2020, 1, 4, 6, 7, 6, 0, time.UTC),
			State:        base.ReviewStateChangesRequested,
			Content:      "Don't add more reviews",
		},
		{
			ID:           338349019,
			IssueIndex:   4,
			ReviewerID:   81045,
			ReviewerName: "lunny",
			CommitID:     "2be9101c543658591222acbee3eb799edfc3853d",
			CreatedAt:    time.Date(2020, 1, 4, 11, 21, 41, 0, time.UTC),
			State:        base.ReviewStateCommented,
			Comments: []*base.ReviewComment{
				{
					ID:        363029944,
					Content:   "test a single comment.",
					TreePath:  "LICENSE",
					DiffHunk:  "@@ -19,3 +19,5 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n SOFTWARE.\n+",
					Position:  4,
					CommitID:  "2be9101c543658591222acbee3eb799edfc3853d",
					PosterID:  81045,
					CreatedAt: time.Date(2020, 1, 4, 11, 21, 41, 0, time.UTC),
					UpdatedAt: time.Date(2020, 1, 4, 11, 21, 41, 0, time.UTC),
				},
			},
		},
	}, reviews)
}

func TestConvertGithubDismissedReview(t *testing.T) {
	review := convertGithubReview(&github.PullRequestReview{State: new("DISMISSED")})
	assert.Equal(t, base.ReviewStateCommented, review.State)
	assert.True(t, review.Dismissed)
}

func TestGithubFormatCloneURL(t *testing.T) {
	testCases := []struct {
		desc             string
		token            string
		username         string
		expectedCloneURL string
	}{
		{
			desc:             "Single Token",
			token:            "single_token",
			expectedCloneURL: "https://oauth2:single_token@github.com",
		},
		{
			desc:             "Multi Token",
			token:            "token1,token2",
			expectedCloneURL: "https://oauth2:token1@github.com",
		},
		{
			desc:             "Username And Password",
			username:         "user",
			expectedCloneURL: "https://user:password@github.com",
		},
	}
	factory := GithubDownloaderV3Factory{}

	for _, tC := range testCases {
		t.Run(tC.desc, func(t *testing.T) {
			opts := base.MigrateOptions{CloneAddr: "https://github.com/go-gitea/gitea", AuthToken: tC.token, AuthUsername: tC.username, AuthPassword: "password"}
			client, err := factory.New(t.Context(), opts)
			require.NoError(t, err)

			cloneURL, err := client.FormatCloneURL(opts, "https://github.com")
			require.NoError(t, err)

			assert.Equal(t, tC.expectedCloneURL, cloneURL)
		})
	}
}

func TestGithubMultiTokenClientSelection(t *testing.T) {
	downloader := &GithubDownloaderV3{
		clients: make([]*github.Client, 3),
		rates:   make([]*github.Rate, 3),
	}

	downloader.waitAndPickClient(t.Context())
	assert.Equal(t, 0, downloader.curClientIdx)

	downloader.rates[0] = &github.Rate{Remaining: 100}
	downloader.waitAndPickClient(t.Context())
	assert.Equal(t, 1, downloader.curClientIdx)

	downloader.rates[1] = &github.Rate{Remaining: 200}
	downloader.waitAndPickClient(t.Context())
	assert.Equal(t, 2, downloader.curClientIdx)

	downloader.rates[2] = &github.Rate{Remaining: 50}
	downloader.waitAndPickClient(t.Context())
	assert.Equal(t, 1, downloader.curClientIdx)
}

func TestGitHubIssuesPageBasedLinkFallback(t *testing.T) {
	_, callerFile, _, _ := runtime.Caller(0)
	mockServer := unittest.NewMockWebServer(t, "https://api.github.com", filepath.Join(filepath.Dir(callerFile), "_mock_data/TestGitHubDownloadRepo"), false, unittest.MockServerOptions{
		StripPrefix: "/api/v3",
	})
	downloader, err := NewGithubDownloaderV3(t.Context(), mockServer.URL, "", "", "", "go-gitea", "test_repo")
	require.NoError(t, err)
	downloader.SkipReactions = true
	for page, want := range [][]int64{{1, 2, 3}, {}} {
		issues, isEnd, err := downloader.GetIssues(t.Context(), page+1, 3)
		require.NoError(t, err)
		numbers := make([]int64, 0, len(issues))
		for _, issue := range issues {
			numbers = append(numbers, issue.Number)
		}
		assert.Equal(t, want, numbers)
		assert.Equal(t, page == 1, isEnd)
	}
}

func TestGithubFactoryUsesGraphQLOnlyWhereItWorks(t *testing.T) {
	for _, testcase := range []struct {
		name string
		opts base.MigrateOptions
		want bool
	}{
		{name: "token, issues", opts: base.MigrateOptions{AuthToken: "tok", Issues: true}, want: true},
		{name: "basic auth, pull requests", opts: base.MigrateOptions{AuthUsername: "u", AuthPassword: "pat", PullRequests: true}, want: true},
		{name: "anonymous repository", opts: base.MigrateOptions{Issues: true, PullRequests: true}},
		{name: "comments only", opts: base.MigrateOptions{AuthToken: "tok", Comments: true}},
		{name: "issues with comments", opts: base.MigrateOptions{AuthToken: "tok", Issues: true, Comments: true}, want: true},
	} {
		t.Run(testcase.name, func(t *testing.T) {
			testcase.opts.CloneAddr = "https://github.com/go-gitea/test_repo"
			candidate, err := (&GithubDownloaderV3Factory{}).New(t.Context(), testcase.opts)
			require.NoError(t, err)
			downloader, isGraphQL := candidate.(*GithubGraphQLDownloader)
			assert.Equal(t, testcase.want, isGraphQL)
			if isGraphQL {
				assert.Equal(t, !testcase.opts.Comments, downloader.skipComments)
			}
		})
	}
}

func TestGithubGraphQLFallsBackToREST(t *testing.T) {
	for _, connection := range []string{"issues", "pull requests"} {
		t.Run(connection, func(t *testing.T) {
			var restPage string
			downloader := newGithubTestDownloader(t, func(writer http.ResponseWriter, request *http.Request) {
				if request.URL.Path == "/api/graphql" {
					http.NotFound(writer, request)
					return
				}
				restPage = request.URL.Query().Get("page")
				_, _ = writer.Write([]byte(`[{"number":1,"title":"t","state":"open"}]`))
			})
			downloader.SkipReactions = true
			if connection == "issues" {
				issues, _, err := downloader.GetIssues(t.Context(), 3, 10)
				require.NoError(t, err)
				require.Len(t, issues, 1)
				assert.EqualValues(t, 1, issues[0].Number)
			} else {
				prs, _, err := downloader.GetPullRequests(t.Context(), 3, 10)
				require.NoError(t, err)
				require.Len(t, prs, 1)
				assert.EqualValues(t, 1, prs[0].Number)
			}
			assert.True(t, downloader.restFallback)
			assert.Equal(t, "1", restPage)
		})
	}
}

func TestGitBucketPaginatesWithoutLinkHeader(t *testing.T) {
	const total = 26
	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		page, _ := strconv.Atoi(request.URL.Query().Get("page"))
		var items []string
		for number := (page-1)*25 + 1; number <= min(page*25, total); number++ {
			items = append(items, fmt.Sprintf(`{"number":%d,"title":"t"}`, number))
		}
		writer.Header().Set("X-RateLimit-Remaining", "4000")
		_, _ = writer.Write([]byte("[" + strings.Join(items, ",") + "]"))
	}))
	t.Cleanup(server.Close)
	downloader, err := NewGitBucketDownloader(t.Context(), server.URL, "", "", "", "o", "r")
	require.NoError(t, err)
	for _, connection := range []string{"issues", "pull requests"} {
		t.Run(connection, func(t *testing.T) {
			var count int
			for page := 1; ; page++ {
				require.LessOrEqual(t, page, 3)
				var isEnd bool
				if connection == "issues" {
					issues, done, err := downloader.GetIssues(t.Context(), page, 10)
					require.NoError(t, err)
					count += len(issues)
					isEnd = done
				} else {
					prs, done, err := downloader.GetPullRequests(t.Context(), page, 10)
					require.NoError(t, err)
					count += len(prs)
					isEnd = done
				}
				if isEnd {
					break
				}
			}
			assert.Equal(t, total, count)
		})
	}
}