package worktree

import (
	"context"
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/kandev/kandev/internal/repoclone"
)

// initGitRepoWithOriginAheadLocal builds the shape that matters here: a normal
// repository sitting on `main`, wired to a reachable bare `origin`, whose local
// `main` carries a commit that was never pushed. origin/main is therefore a
// strict ancestor of local main.
//
// Returns the working repository path and the local-only commit SHA.
func initGitRepoWithOriginAheadLocal(t *testing.T) (string, string) {
	t.Helper()

	base := t.TempDir()
	originPath := filepath.Join(base, "origin.git")
	repoPath := filepath.Join(base, "repo")

	runGit(t, base, "init", "--bare", "-b", "main", originPath)
	runGit(t, base, "init", "-b", "main", repoPath)
	runGit(t, repoPath, "config", "user.email", "test@example.com")
	runGit(t, repoPath, "config", "user.name", "Test User")
	runGit(t, repoPath, "config", "commit.gpgsign", "false")

	writeRepoFile(t, repoPath, "README.md", "initial\n")
	runGit(t, repoPath, "add", "README.md")
	runGit(t, repoPath, "commit", "-m", "initial commit")
	runGit(t, repoPath, "remote", "add", "origin", originPath)
	runGit(t, repoPath, "push", "origin", "main")

	// The commit that only exists locally — the equivalent of a user's unpushed
	// work on their base branch.
	writeRepoFile(t, repoPath, "local-only.txt", "unpushed\n")
	runGit(t, repoPath, "add", "local-only.txt")
	runGit(t, repoPath, "commit", "-m", "local-only commit")

	localHead := strings.TrimSpace(runGit(t, repoPath, "rev-parse", "main"))
	return repoPath, localHead
}

func initGitRepoWithDivergedOrigin(t *testing.T) (string, string, string) {
	t.Helper()

	base := t.TempDir()
	originPath := filepath.Join(base, "origin.git")
	repoPath := filepath.Join(base, "repo")
	otherPath := filepath.Join(base, "other")

	runGit(t, base, "init", "--bare", "-b", "main", originPath)
	runGit(t, base, "init", "-b", "main", repoPath)
	runGit(t, repoPath, "config", "user.email", "test@example.com")
	runGit(t, repoPath, "config", "user.name", "Test User")
	runGit(t, repoPath, "config", "commit.gpgsign", "false")
	writeRepoFile(t, repoPath, "README.md", "initial\n")
	runGit(t, repoPath, "add", "README.md")
	runGit(t, repoPath, "commit", "-m", "initial commit")
	runGit(t, repoPath, "remote", "add", "origin", originPath)
	runGit(t, repoPath, "push", "origin", "main")

	writeRepoFile(t, repoPath, "local-only.txt", "local\n")
	runGit(t, repoPath, "add", "local-only.txt")
	runGit(t, repoPath, "commit", "-m", "local-only commit")
	localHead := strings.TrimSpace(runGit(t, repoPath, "rev-parse", "main"))

	runGit(t, base, "clone", originPath, otherPath)
	runGit(t, otherPath, "config", "user.email", "other@example.com")
	runGit(t, otherPath, "config", "user.name", "Other User")
	runGit(t, otherPath, "config", "commit.gpgsign", "false")
	writeRepoFile(t, otherPath, "remote-only.txt", "remote\n")
	runGit(t, otherPath, "add", "remote-only.txt")
	runGit(t, otherPath, "commit", "-m", "remote-only commit")
	runGit(t, otherPath, "push", "origin", "main")
	runGit(t, repoPath, "fetch", "origin", "main")
	remoteHead := strings.TrimSpace(runGit(t, repoPath, "rev-parse", "origin/main"))

	return repoPath, localHead, remoteHead
}

// captureSyncProgress records every SyncProgressEvent so a test can assert
// which branch of the sync actually ran, not merely what it returned.
func captureSyncProgress(events *[]SyncProgressEvent) SyncProgressCallback {
	return func(event SyncProgressEvent) { *events = append(*events, event) }
}

// syncOutputs joins the captured progress output for assertion messages.
func syncOutputs(events []SyncProgressEvent) string {
	parts := make([]string, 0, len(events))
	for _, e := range events {
		parts = append(parts, e.Output)
	}
	return strings.Join(parts, " | ")
}

func TestCreateWorktree_PullEnabledUsesLocalOnlyBase(t *testing.T) {
	repoPath, localHead := initGitRepoWithOriginAheadLocal(t)
	// Keep the local branch usable while making the refresh itself fail. The
	// warning assertions below ensure Git's credential-bearing failure output
	// does not cross the sync-progress boundary.
	runGit(t, repoPath, "remote", "set-url", "origin", "https://user:super-secret@127.0.0.1:1/missing.git")

	mgr, err := NewManager(newTestConfig(t), newMockStore(), newTestLogger())
	if err != nil {
		t.Fatalf("NewManager failed: %v", err)
	}

	var events []SyncProgressEvent
	wt, err := mgr.Create(context.Background(), CreateRequest{
		TaskID:             "task-local-base",
		SessionID:          "session-local-base",
		RepositoryID:       "repo-local-base",
		RepositoryPath:     repoPath,
		BaseBranch:         "main",
		PullBeforeWorktree: true,
		TaskDirName:        "task-local-base",
		RepoName:           "repo",
		OnSyncProgress:     captureSyncProgress(&events),
	})
	if err != nil {
		t.Fatalf("Create() error = %v", err)
	}
	if wt == nil {
		t.Fatal("Create() returned a nil worktree")
	}

	gotHead := strings.TrimSpace(runGit(t, wt.Path, "rev-parse", "HEAD"))
	if gotHead != localHead {
		t.Fatalf("worktree HEAD = %s, want local-only base %s", gotHead, localHead)
	}
	if len(events) != 2 || events[0].Status != SyncProgressRunning || events[1].Status != SyncProgressCompleted {
		t.Fatalf("sync progress = %#v, want running then completed", events)
	}
	if events[1].Warning == "" || events[1].WarningDetail == "" {
		t.Fatalf("sync progress = %#v, want bounded fallback warning and detail", events)
	}
	if strings.Contains(syncOutputs(events), "super-secret") {
		t.Fatalf("sync progress exposed credential-bearing Git output: %#v", events)
	}
}

func TestPullBaseBranch_MissingRemoteRefUsesLocalBase(t *testing.T) {
	repoPath, localHead := initGitRepoWithOriginAheadLocal(t)
	runGit(t, repoPath, "branch", "local-only-base")

	mgr := newRecreateTestManager(t)
	var events []SyncProgressEvent
	resolved, err := mgr.pullBaseBranch(context.Background(), repoPath, "local-only-base", captureSyncProgress(&events))
	if err != nil {
		t.Fatalf("pullBaseBranch() error = %v", err)
	}
	if resolved != "local-only-base" {
		t.Fatalf("resolved ref = %q, want local-only-base", resolved)
	}
	if got := strings.TrimSpace(runGit(t, repoPath, "rev-parse", resolved)); got != localHead {
		t.Fatalf("resolved SHA = %q, want local-only commit %q", got, localHead)
	}
	if len(events) != 2 || events[1].Status != SyncProgressCompleted || events[1].Warning == "" {
		t.Fatalf("sync progress = %#v, want completed warning", events)
	}
	if !strings.Contains(events[1].Output, "missing_remote_ref") {
		t.Fatalf("sync output = %q, want missing_remote_ref classification", events[1].Output)
	}
}

func TestPullBaseBranch_DivergedRefsUseLocalBaseWithWarning(t *testing.T) {
	repoPath, localHead, remoteHead := initGitRepoWithDivergedOrigin(t)
	mgr := newRecreateTestManager(t)

	var events []SyncProgressEvent
	resolved, err := mgr.pullBaseBranch(context.Background(), repoPath, "main", captureSyncProgress(&events))
	if err != nil {
		t.Fatalf("pullBaseBranch() error = %v", err)
	}
	if resolved != "main" {
		t.Fatalf("resolved ref = %q, want local main", resolved)
	}
	if got := strings.TrimSpace(runGit(t, repoPath, "rev-parse", "main")); got != localHead {
		t.Fatalf("local main moved to %q, want %q", got, localHead)
	}
	if got := strings.TrimSpace(runGit(t, repoPath, "rev-parse", "origin/main")); got != remoteHead {
		t.Fatalf("origin/main moved to %q, want %q", got, remoteHead)
	}
	if len(events) != 2 || events[1].Status != SyncProgressCompleted || events[1].Warning == "" {
		t.Fatalf("sync progress = %#v, want completed warning", events)
	}
	if !strings.Contains(events[1].Output, "diverged_refs") {
		t.Fatalf("sync output = %q, want diverged_refs classification", events[1].Output)
	}
}

func TestCreateWorktree_ManagedRefreshDivergenceUsesLocalBaseWarning(t *testing.T) {
	repoPath, localHead, _ := initGitRepoWithDivergedOrigin(t)
	mgr := newRecreateTestManager(t)

	wt, err := mgr.Create(context.Background(), CreateRequest{
		TaskID:             "task-managed-divergence",
		SessionID:          "session-managed-divergence",
		RepositoryID:       "repo-managed-divergence",
		RepositoryPath:     repoPath,
		BaseBranch:         "main",
		PullBeforeWorktree: true,
		RemoteSyncHandled:  true,
		TaskDirName:        "task-managed-divergence",
		RepoName:           "repo",
	})
	if err != nil {
		t.Fatalf("Create() error = %v", err)
	}
	if wt.BaseBranchFallbackWarning == "" || wt.BaseBranchFallbackDetail == "" {
		t.Fatalf("worktree fallback warning = %#v, want warning and detail", wt)
	}
	if strings.Contains(wt.BaseBranchFallbackWarning, "fatal") || strings.Contains(wt.BaseBranchFallbackDetail, "fatal") {
		t.Fatalf("worktree fallback warning exposed raw Git output: %#v", wt)
	}
	if got := strings.TrimSpace(runGit(t, wt.Path, "rev-parse", "HEAD")); got != localHead {
		t.Fatalf("managed-refresh worktree HEAD = %q, want local base %q", got, localHead)
	}
}

// @covers AC-WORKSPACES-WORKTREE-BASE-REFRESH-001.13
func TestCreateWorktree_ManagedRefreshMissingBaseUsesConfiguredFallback(t *testing.T) {
	repoPath := initGitRepoWithRemote(t)
	runGit(t, repoPath, "branch", "feature/deleted-parent")
	mgr := newRecreateTestManager(t)

	wt, err := mgr.Create(context.Background(), CreateRequest{
		TaskID:             "task-managed-missing-base",
		SessionID:          "session-managed-missing-base",
		RepositoryID:       "repo-managed-missing-base",
		RepositoryPath:     repoPath,
		BaseBranch:         "feature/deleted-parent",
		FallbackBaseBranch: "main",
		PullBeforeWorktree: true,
		RemoteSyncHandled:  true,
		TaskDirName:        "task-managed-missing-base",
		RepoName:           "repo",
	})
	if err != nil {
		t.Fatalf("Create() error = %v", err)
	}
	if wt.BaseBranch != "main" {
		t.Fatalf("worktree BaseBranch = %q, want main", wt.BaseBranch)
	}
	if !strings.Contains(wt.BaseBranchFallbackWarning, "feature/deleted-parent") ||
		!strings.Contains(wt.BaseBranchFallbackWarning, "main") {
		t.Fatalf("fallback warning = %q, want old and new branches", wt.BaseBranchFallbackWarning)
	}
}

func TestCreateWorktree_ManagedRefreshFailureUsesLocalBaseWarning(t *testing.T) {
	repoPath, localHead := initGitRepoWithOriginAheadLocal(t)
	mgr := newRecreateTestManager(t)
	refreshCalls := 0
	var events []SyncProgressEvent

	wt, err := mgr.Create(context.Background(), CreateRequest{
		TaskID:             "task-managed-refresh-failure",
		SessionID:          "session-managed-refresh-failure",
		RepositoryID:       "repo-managed-refresh-failure",
		RepositoryPath:     repoPath,
		BaseBranch:         "main",
		PullBeforeWorktree: true,
		RefreshRepositoryWithState: func(context.Context) (repoclone.RemoteRefState, error) {
			refreshCalls++
			return repoclone.RemoteRefStateUnknown, errors.New("authentication failed for https://user:super-secret@example.invalid/repo.git")
		},
		TaskDirName:    "task-managed-refresh-failure",
		RepoName:       "repo",
		OnSyncProgress: captureSyncProgress(&events),
	})
	if err != nil {
		t.Fatalf("Create() error = %v", err)
	}
	if refreshCalls != 1 {
		t.Fatalf("refresh calls = %d, want one attempted provider refresh", refreshCalls)
	}
	if wt.BaseBranchFallbackWarning == "" || wt.BaseBranchFallbackDetail == "" {
		t.Fatalf("worktree fallback warning = %#v, want warning and detail", wt)
	}
	if strings.Contains(wt.BaseBranchFallbackWarning, "super-secret") || strings.Contains(wt.BaseBranchFallbackDetail, "super-secret") {
		t.Fatalf("worktree fallback warning exposed provider credentials: %#v", wt)
	}
	if len(events) != 1 || events[0].Status != SyncProgressCompleted || events[0].Warning == "" {
		t.Fatalf("provider refresh progress = %#v, want one completed warning", events)
	}
	if strings.Contains(syncOutputs(events), "super-secret") {
		t.Fatalf("provider refresh progress exposed provider credentials: %#v", events)
	}
	if got := strings.TrimSpace(runGit(t, wt.Path, "rev-parse", "HEAD")); got != localHead {
		t.Fatalf("managed-refresh fallback HEAD = %q, want local base %q", got, localHead)
	}
}

func TestCreateWorktree_ManagedRefreshFailureKeepsMissingCheckoutBranchStrict(t *testing.T) {
	repoPath, _ := initGitRepoWithOriginAheadLocal(t)
	mgr := newRecreateTestManager(t)

	_, err := mgr.Create(context.Background(), CreateRequest{
		TaskID:             "task-managed-missing-checkout",
		SessionID:          "session-managed-missing-checkout",
		RepositoryID:       "repo-managed-missing-checkout",
		RepositoryPath:     repoPath,
		BaseBranch:         "main",
		CheckoutBranch:     "feature/remote-only",
		PullBeforeWorktree: true,
		RefreshRepository: func(context.Context) error {
			return errors.New("provider refresh unavailable")
		},
		TaskDirName: "task-managed-missing-checkout",
		RepoName:    "repo",
	})
	if !errors.Is(err, ErrInvalidBaseBranch) {
		t.Fatalf("Create() error = %v, want missing checkout branch to remain strict", err)
	}
}

func TestCreateWorktree_ManagedRefreshFailureUsesLocalCheckoutBranch(t *testing.T) {
	repoPath, _ := initGitRepoWithOriginAheadLocal(t)
	checkoutBranch := "feature/local-only"
	runGit(t, repoPath, "checkout", "-b", checkoutBranch)
	writeRepoFile(t, repoPath, "local-checkout-only.txt", "unpushed checkout work\n")
	runGit(t, repoPath, "add", "local-checkout-only.txt")
	runGit(t, repoPath, "commit", "-m", "local-only checkout commit")
	localCheckoutHead := strings.TrimSpace(runGit(t, repoPath, "rev-parse", checkoutBranch))
	runGit(t, repoPath, "checkout", "main")
	runGit(t, repoPath, "remote", "set-url", "origin", "https://user:super-secret@127.0.0.1:1/missing.git")

	mgr := newRecreateTestManager(t)
	wt, err := mgr.Create(context.Background(), CreateRequest{
		TaskID:             "task-managed-local-checkout",
		SessionID:          "session-managed-local-checkout",
		RepositoryID:       "repo-managed-local-checkout",
		RepositoryPath:     repoPath,
		BaseBranch:         "main",
		CheckoutBranch:     checkoutBranch,
		PullBeforeWorktree: true,
		RefreshRepository: func(context.Context) error {
			return errors.New("provider refresh unavailable")
		},
		TaskDirName: "task-managed-local-checkout",
		RepoName:    "repo",
	})
	if err != nil {
		t.Fatalf("Create() error = %v, want the existing local checkout branch", err)
	}
	if wt.Branch != checkoutBranch {
		t.Fatalf("worktree branch = %q, want %q", wt.Branch, checkoutBranch)
	}
	if got := strings.TrimSpace(runGit(t, wt.Path, "rev-parse", "HEAD")); got != localCheckoutHead {
		t.Fatalf("worktree HEAD = %q, want local checkout HEAD %q", got, localCheckoutHead)
	}
	if wt.FetchWarning == "" {
		t.Fatal("local checkout fallback did not surface a fetch warning")
	}
	wantDetail := fmt.Sprintf("The local checkout branch %q was verified after refresh failed. Kandev did not change Git refs.", checkoutBranch)
	if wt.FetchWarningDetail != wantDetail {
		t.Fatalf("fetch warning detail = %q, want bounded detail %q", wt.FetchWarningDetail, wantDetail)
	}
	if strings.Contains(wt.FetchWarning, "super-secret") || strings.Contains(wt.FetchWarningDetail, "super-secret") {
		t.Fatalf("checkout fallback warning exposed provider credentials: warning=%q detail=%q", wt.FetchWarning, wt.FetchWarningDetail)
	}
}

func TestCreateWorktree_ManagedRefreshFailureKeepsRemoteOnlyStrict(t *testing.T) {
	repoPath, _ := initGitRepoWithOriginAheadLocal(t)
	mgr := newRecreateTestManager(t)
	refreshErr := errors.New("authentication failed for https://user:super-secret@example.invalid/repo.git")

	_, err := mgr.Create(context.Background(), CreateRequest{
		TaskID:             "task-managed-remote-only",
		SessionID:          "session-managed-remote-only",
		RepositoryID:       "repo-managed-remote-only",
		RepositoryPath:     repoPath,
		BaseBranch:         "origin/main",
		PullBeforeWorktree: true,
		RefreshRepository: func(context.Context) error {
			return refreshErr
		},
		TaskDirName: "task-managed-remote-only",
		RepoName:    "repo",
	})
	if !errors.Is(err, refreshErr) {
		t.Fatalf("Create() error = %v, want the provider refresh error", err)
	}
}

func TestPullBaseBranch_UncertainAncestryUsesLocalBaseWithWarning(t *testing.T) {
	scriptDir := writeFakeGitScript(t, `
case "${1:-}" in
  fetch)
    exit 0
    ;;
  pull)
    exit 1
    ;;
  rev-parse)
    if [ "${2:-}" = "--abbrev-ref" ]; then
      echo "main"
    fi
    exit 0
    ;;
  merge-base)
    echo "fatal: unable to inspect ancestry" >&2
    exit 128
    ;;
  *)
    exit 0
    ;;
esac
`)
	t.Setenv("PATH", scriptDir+string(os.PathListSeparator)+os.Getenv("PATH"))

	mgr := newRecreateTestManager(t)
	var events []SyncProgressEvent
	resolved, err := mgr.pullBaseBranch(context.Background(), t.TempDir(), "main", captureSyncProgress(&events))
	if err != nil {
		t.Fatalf("pullBaseBranch() error = %v", err)
	}
	if resolved != "main" {
		t.Fatalf("resolved ref = %q, want local main", resolved)
	}
	if len(events) != 2 || events[1].Status != SyncProgressCompleted || events[1].Warning == "" {
		t.Fatalf("sync progress = %#v, want completed warning", events)
	}
	if !strings.Contains(events[1].Output, "base_ref_unverified") {
		t.Fatalf("sync output = %q, want base_ref_unverified classification", events[1].Output)
	}
	if strings.Contains(events[1].WarningDetail, "unable to inspect") {
		t.Fatalf("warning detail exposed raw ancestry output: %q", events[1].WarningDetail)
	}
}

func TestCreateWorktree_CancelledRefreshDoesNotCreateFallback(t *testing.T) {
	repoPath, _ := initGitRepoWithOriginAheadLocal(t)
	mgr := newRecreateTestManager(t)
	ctx, cancel := context.WithCancel(context.Background())
	cancel()

	wt, err := mgr.Create(ctx, CreateRequest{
		TaskID:             "task-cancelled-refresh",
		SessionID:          "session-cancelled-refresh",
		RepositoryID:       "repo-cancelled-refresh",
		RepositoryPath:     repoPath,
		BaseBranch:         "main",
		PullBeforeWorktree: true,
		TaskDirName:        "task-cancelled-refresh",
		RepoName:           "repo",
	})
	if wt != nil {
		t.Fatalf("Create() returned a worktree after cancellation: %#v", wt)
	}
	if !errors.Is(err, context.Canceled) {
		t.Fatalf("Create() error = %v, want context.Canceled", err)
	}
	path, pathErr := mgr.config.TaskWorktreePath("task-cancelled-refresh", "repo", "")
	if pathErr != nil {
		t.Fatalf("TaskWorktreePath() error = %v", pathErr)
	}
	if _, statErr := os.Stat(path); !errors.Is(statErr, os.ErrNotExist) {
		t.Fatalf("cancelled Create() left fallback worktree path: %v", statErr)
	}
}

// TestPullBaseBranch_PullFailureKeepsLocalCommits pins the behaviour that a
// transient `git pull` failure must not silently rebase the worktree's starting
// point onto origin/<branch>.
//
// When the pull fails for an environmental reason (throttle contention, a
// timeout, a stale index.lock) origin/<branch> is not fresher than the local
// branch — here it is a strict ancestor of it. Returning the remote ref
// therefore discards the user's unpushed commits from the new worktree, and it
// does so silently: creation still succeeds, so nothing surfaces the loss.
//
// The two sibling fallbacks in manager_git.go (handleFetchFallback, and the
// non-current-branch path in resolveLocalBaseRef) already resolve to the local
// branch on failure. This one must agree with them.
func TestPullBaseBranch_PullFailureKeepsLocalCommits(t *testing.T) {
	repoPath, localHead := initGitRepoWithOriginAheadLocal(t)

	mgr, err := NewManager(newTestConfig(t), newMockStore(), newTestLogger())
	if err != nil {
		t.Fatalf("NewManager failed: %v", err)
	}
	// Let the fetch succeed (so we reach the pull) but force the pull to fail
	// the way contention makes it fail in a loaded run. A zero timeout yields
	// an already-expired context, so the pull cannot accidentally succeed.
	mgr.pullTimeout = 0

	var events []SyncProgressEvent
	resolved, err := mgr.pullBaseBranch(context.Background(), repoPath, "main", captureSyncProgress(&events))
	if err != nil {
		t.Fatalf("pullBaseBranch() error = %v", err)
	}
	if resolved == "" {
		t.Fatal("pullBaseBranch returned an empty ref")
	}

	// Prove the failure path actually ran. Both the success and failure paths
	// resolve to `main` here, so the SHA assertion below cannot distinguish
	// them on its own — without this the test would pass vacuously if the pull
	// ever succeeded. The failure path reports "Pull <reason>; using <ref>",
	// the success path "Synced and using <ref>".
	outputs := syncOutputs(events)
	if !strings.Contains(outputs, "Pull ") {
		t.Fatalf(
			"pull was expected to fail and take the fallback path, but sync progress was %q;\n"+
				"the assertion below would pass without exercising the fallback",
			outputs,
		)
	}

	// Assert on the commit the ref actually points at, not on the ref's name:
	// the defect is that the worktree starts from the wrong commit, and a
	// name-only assertion would still pass if the mapping changed.
	resolvedSHA := strings.TrimSpace(runGit(t, repoPath, "rev-parse", resolved))
	if resolvedSHA != localHead {
		t.Fatalf(
			"pullBaseBranch resolved %q to %s, which drops the unpushed local commit %s;\n"+
				"a failed pull must not move the worktree base backwards onto origin/main",
			resolved, resolvedSHA, localHead,
		)
	}
}

func TestResolveBaseRefWithFallback_RefreshFailureUsesLocalBase(t *testing.T) {
	repoPath, _ := initGitRepoWithOriginAheadLocal(t)
	mgr, err := NewManager(newTestConfig(t), newMockStore(), newTestLogger())
	if err != nil {
		t.Fatalf("NewManager failed: %v", err)
	}
	scriptDir := writeFakeGitScript(t, `
case "${1:-}" in
  fetch)
    echo "fatal: Authentication failed" >&2
    exit 1
    ;;
  *)
    exit 0
    ;;
esac
`)
	t.Setenv("PATH", scriptDir+string(os.PathListSeparator)+os.Getenv("PATH"))

	req := CreateRequest{
		RepositoryPath: repoPath, BaseBranch: "main", FallbackBaseBranch: "develop", PullBeforeWorktree: true,
	}
	var events []SyncProgressEvent
	req.OnSyncProgress = captureSyncProgress(&events)
	baseRef, _, _, err := mgr.resolveBaseRefWithFallback(context.Background(), &req)
	if err != nil {
		t.Fatalf("resolveBaseRefWithFallback() error = %v", err)
	}
	if baseRef != "main" {
		t.Fatalf("resolved base ref = %q, want local main", baseRef)
	}
	if len(events) != 2 || events[0].Status != SyncProgressRunning || events[1].Status != SyncProgressCompleted {
		t.Fatalf("refresh progress = %#v, want running then completed", events)
	}
	if events[1].Warning == "" || events[1].WarningDetail == "" {
		t.Fatalf("refresh fallback warning = %#v, want warning and detail", events[1])
	}
	if strings.Contains(events[1].Warning, "Authentication") || strings.Contains(events[1].WarningDetail, "Authentication") {
		t.Fatalf("refresh progress exposed unsafe error detail: %#v", events[1])
	}
}

func TestPreferRefreshedRemoteRefSelectsSafeContainingRef(t *testing.T) {
	t.Run("local contains remote", func(t *testing.T) {
		repoPath, _ := initGitRepoWithOriginAheadLocal(t)
		mgr := newRecreateTestManager(t)

		resolved, err := mgr.preferRefreshedRemoteRef(context.Background(), repoPath, "main")
		if err != nil {
			t.Fatalf("preferRefreshedRemoteRef() error: %v", err)
		}
		if resolved != "main" {
			t.Fatalf("resolved ref = %q, want local main", resolved)
		}
	})

	t.Run("remote contains local", func(t *testing.T) {
		repoPath := initGitRepoWithRemote(t)
		otherPath := filepath.Join(t.TempDir(), "other")
		originURL := strings.TrimSpace(runGit(t, repoPath, "remote", "get-url", "origin"))
		runGit(t, filepath.Dir(otherPath), "clone", originURL, otherPath)
		runGit(t, otherPath, "config", "user.email", "other@example.com")
		runGit(t, otherPath, "config", "user.name", "Other User")
		runGit(t, otherPath, "config", "commit.gpgsign", "false")
		writeRepoFile(t, otherPath, "remote-only.txt", "pushed\n")
		runGit(t, otherPath, "add", "remote-only.txt")
		runGit(t, otherPath, "commit", "-m", "remote-only commit")
		runGit(t, otherPath, "push", "origin", "main")
		runGit(t, repoPath, "fetch", "origin", "main")

		mgr := newRecreateTestManager(t)
		resolved, err := mgr.preferRefreshedRemoteRef(context.Background(), repoPath, "main")
		if err != nil {
			t.Fatalf("preferRefreshedRemoteRef() error: %v", err)
		}
		if resolved != "origin/main" {
			t.Fatalf("resolved ref = %q, want origin/main", resolved)
		}
	})
}

func TestPreferRefreshedRemoteRefRejectsDivergedRefs(t *testing.T) {
	repoPath := initGitRepoWithRemote(t)
	writeRepoFile(t, repoPath, "local-only.txt", "local\n")
	runGit(t, repoPath, "add", "local-only.txt")
	runGit(t, repoPath, "commit", "-m", "local-only commit")

	otherPath := filepath.Join(t.TempDir(), "other")
	originURL := strings.TrimSpace(runGit(t, repoPath, "remote", "get-url", "origin"))
	runGit(t, filepath.Dir(otherPath), "clone", originURL, otherPath)
	runGit(t, otherPath, "config", "user.email", "other@example.com")
	runGit(t, otherPath, "config", "user.name", "Other User")
	runGit(t, otherPath, "config", "commit.gpgsign", "false")
	writeRepoFile(t, otherPath, "remote-only.txt", "remote\n")
	runGit(t, otherPath, "add", "remote-only.txt")
	runGit(t, otherPath, "commit", "-m", "remote-only commit")
	runGit(t, otherPath, "push", "origin", "main")
	runGit(t, repoPath, "fetch", "origin", "main")

	mgr := newRecreateTestManager(t)
	if _, err := mgr.preferRefreshedRemoteRef(context.Background(), repoPath, "main"); err == nil {
		t.Fatal("preferRefreshedRemoteRef() accepted diverged local and remote refs")
	}
}

func TestPreferRefreshedRemoteRefRejectsUncertainAncestry(t *testing.T) {
	scriptDir := writeFakeGitScript(t, `
case "${1:-}" in
  rev-parse)
    exit 0
    ;;
  merge-base)
    echo "fatal: unable to inspect repository" >&2
    exit 128
    ;;
  *)
    exit 0
    ;;
esac
`)
	t.Setenv("PATH", scriptDir+string(os.PathListSeparator)+os.Getenv("PATH"))

	mgr := newRecreateTestManager(t)
	if _, err := mgr.preferRefreshedRemoteRef(context.Background(), t.TempDir(), "main"); err == nil {
		t.Fatal("preferRefreshedRemoteRef() accepted an ancestry probe failure")
	}
}

// TestPullBaseBranch_SuccessfulPullStillAdoptsRemoteCommits guards the happy
// path the fix must not regress: when the pull succeeds, the base branch is
// fast-forwarded and the worktree starts from the updated local branch, which
// now contains the remote commit.
func TestPullBaseBranch_SuccessfulPullStillAdoptsRemoteCommits(t *testing.T) {
	base := t.TempDir()
	originPath := filepath.Join(base, "origin.git")
	repoPath := filepath.Join(base, "repo")
	otherPath := filepath.Join(base, "other")

	runGit(t, base, "init", "--bare", "-b", "main", originPath)
	runGit(t, base, "init", "-b", "main", repoPath)
	runGit(t, repoPath, "config", "user.email", "test@example.com")
	runGit(t, repoPath, "config", "user.name", "Test User")
	runGit(t, repoPath, "config", "commit.gpgsign", "false")
	writeRepoFile(t, repoPath, "README.md", "initial\n")
	runGit(t, repoPath, "add", "README.md")
	runGit(t, repoPath, "commit", "-m", "initial commit")
	runGit(t, repoPath, "remote", "add", "origin", originPath)
	runGit(t, repoPath, "push", "origin", "main")

	// A second clone pushes a commit the working repo has not seen yet.
	runGit(t, base, "clone", originPath, otherPath)
	runGit(t, otherPath, "config", "user.email", "other@example.com")
	runGit(t, otherPath, "config", "user.name", "Other User")
	runGit(t, otherPath, "config", "commit.gpgsign", "false")
	writeRepoFile(t, otherPath, "remote-only.txt", "pushed\n")
	runGit(t, otherPath, "add", "remote-only.txt")
	runGit(t, otherPath, "commit", "-m", "remote-only commit")
	runGit(t, otherPath, "push", "origin", "main")
	remoteHead := strings.TrimSpace(runGit(t, otherPath, "rev-parse", "HEAD"))

	mgr, err := NewManager(newTestConfig(t), newMockStore(), newTestLogger())
	if err != nil {
		t.Fatalf("NewManager failed: %v", err)
	}

	resolved, err := mgr.pullBaseBranch(context.Background(), repoPath, "main", nil)
	if err != nil {
		t.Fatalf("pullBaseBranch() error = %v", err)
	}
	resolvedSHA := strings.TrimSpace(runGit(t, repoPath, "rev-parse", resolved))
	if resolvedSHA != remoteHead {
		t.Fatalf(
			"pullBaseBranch resolved %q to %s, want the pulled remote commit %s",
			resolved, resolvedSHA, remoteHead,
		)
	}
}