"""Test project-scoped rclone commands."""

from __future__ import annotations

from pathlib import Path

import pytest

from basic_memory.cli.commands.cloud.rclone_commands import (
    MIN_RCLONE_VERSION_EMPTY_DIRS,
    RcloneError,
    SyncProject,
    TransferPlan,
    _conflict_copy_name,
    _parse_check_combined,
    bisync_initialized,
    check_rclone_installed,
    get_project_bisync_state,
    get_project_remote,
    get_rclone_version,
    project_bisync,
    project_check,
    project_copy,
    project_copy_file,
    project_diff,
    project_ls,
    project_sync,
    project_transfer,
    supports_create_empty_src_dirs,
)


class _RunResult:
    def __init__(self, returncode: int = 0, stdout: str = "", stderr: str = ""):
        self.returncode = returncode
        self.stdout = stdout
        self.stderr = stderr


class _Runner:
    def __init__(self, *, returncode: int = 0, stdout: str = "", stderr: str = ""):
        self.calls: list[tuple[list[str], dict]] = []
        self._returncode = returncode
        self._stdout = stdout
        self._stderr = stderr

    def __call__(self, cmd: list[str], **kwargs):
        self.calls.append((cmd, kwargs))
        return _RunResult(returncode=self._returncode, stdout=self._stdout, stderr=self._stderr)


def _assert_has_consistency_headers(cmd: list[str]) -> None:
    """Assert the rclone command includes Tigris consistency headers.

    Uses --header (global flag) so the header applies to ALL HTTP transactions,
    including S3 list requests that bisync issues before any download/upload.
    """
    assert "--header" in cmd
    header_idx = cmd.index("--header")
    assert cmd[header_idx + 1] == "X-Tigris-Consistent: true"


def _write_filter_file(tmp_path: Path) -> Path:
    p = tmp_path / "filters.txt"
    p.write_text("- .git/**\n", encoding="utf-8")
    return p


def test_sync_project_dataclass():
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/Users/test/research"
    )
    assert project.name == "research"
    assert project.path == "app/data/research"
    assert project.local_sync_path == "/Users/test/research"


def test_sync_project_optional_local_path():
    project = SyncProject(name="research", path="app/data/research")
    assert project.name == "research"
    assert project.path == "app/data/research"
    assert project.local_sync_path is None


def test_get_project_remote():
    project = SyncProject(name="research", path="/research")
    assert get_project_remote(project, "my-bucket") == "basic-memory-cloud:my-bucket/research"


def test_get_project_remote_uses_workspace_remote():
    # Non-default/team workspaces route through their own tenant-scoped remote.
    project = SyncProject(name="research", path="/research", remote_name="basic-memory-cloud-acme")
    assert (
        get_project_remote(project, "acme-bucket") == "basic-memory-cloud-acme:acme-bucket/research"
    )


def test_sync_project_remote_name_defaults_to_legacy_remote():
    project = SyncProject(name="research", path="/research")
    assert project.remote_name == "basic-memory-cloud"


def test_get_project_remote_strips_app_data_prefix():
    project = SyncProject(name="research", path="/app/data/research")
    assert get_project_remote(project, "my-bucket") == "basic-memory-cloud:my-bucket/research"


def test_get_project_bisync_state(monkeypatch):
    monkeypatch.delenv("BASIC_MEMORY_CONFIG_DIR", raising=False)
    state_path = get_project_bisync_state("research")
    expected = Path.home() / ".basic-memory" / "bisync-state" / "research"
    assert state_path == expected


def test_get_project_bisync_state_honors_basic_memory_config_dir(tmp_path, monkeypatch):
    """Regression guard for #742: bisync state dir follows BASIC_MEMORY_CONFIG_DIR."""
    custom_dir = tmp_path / "instance-w" / "state"
    monkeypatch.setenv("BASIC_MEMORY_CONFIG_DIR", str(custom_dir))

    assert get_project_bisync_state("research") == custom_dir / "bisync-state" / "research"


def test_bisync_initialized_false_when_not_exists(tmp_path, monkeypatch):
    monkeypatch.setattr(
        "basic_memory.cli.commands.cloud.rclone_commands.get_project_bisync_state",
        lambda project_name: tmp_path / project_name,
    )
    assert bisync_initialized("research") is False


def test_bisync_initialized_false_when_empty(tmp_path, monkeypatch):
    state_dir = tmp_path / "research"
    state_dir.mkdir()
    monkeypatch.setattr(
        "basic_memory.cli.commands.cloud.rclone_commands.get_project_bisync_state",
        lambda project_name: tmp_path / project_name,
    )
    assert bisync_initialized("research") is False


def test_bisync_initialized_true_when_has_files(tmp_path, monkeypatch):
    state_dir = tmp_path / "research"
    state_dir.mkdir()
    (state_dir / "state.lst").touch()
    monkeypatch.setattr(
        "basic_memory.cli.commands.cloud.rclone_commands.get_project_bisync_state",
        lambda project_name: tmp_path / project_name,
    )
    assert bisync_initialized("research") is True


def test_project_sync_success(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    result = project_sync(
        project,
        "my-bucket",
        dry_run=True,
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    assert result is True
    assert len(runner.calls) == 1
    cmd, kwargs = runner.calls[0]
    assert cmd[:2] == ["rclone", "sync"]
    assert Path(cmd[2]) == Path("/tmp/research")
    assert cmd[3] == "basic-memory-cloud:my-bucket/research"
    _assert_has_consistency_headers(cmd)
    assert "--filter-from" in cmd
    assert str(filter_path) in cmd
    assert "--dry-run" in cmd
    assert kwargs["text"] is True


def test_project_sync_with_verbose(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    project_sync(
        project,
        "my-bucket",
        verbose=True,
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert "--verbose" in cmd
    assert "--progress" not in cmd


def test_project_sync_with_progress(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    project_sync(
        project, "my-bucket", run=runner, is_installed=lambda: True, filter_path=filter_path
    )

    cmd, _ = runner.calls[0]
    assert "--progress" in cmd
    assert "--verbose" not in cmd


def test_project_sync_no_local_path():
    project = SyncProject(name="research", path="app/data/research")
    with pytest.raises(RcloneError) as exc_info:
        project_sync(project, "my-bucket", is_installed=lambda: True)
    assert "no local_sync_path configured" in str(exc_info.value)


def test_project_sync_checks_rclone_installed():
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )
    with pytest.raises(RcloneError) as exc_info:
        project_sync(project, "my-bucket", is_installed=lambda: False)
    assert "rclone is not installed" in str(exc_info.value)


def test_project_bisync_success(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    state_path = tmp_path / "state"
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    result = project_bisync(
        project,
        "my-bucket",
        run=runner,
        is_installed=lambda: True,
        version=(1, 64, 2),
        filter_path=filter_path,
        state_path=state_path,
        is_initialized=lambda _name: True,
    )

    assert result is True
    cmd, _ = runner.calls[0]
    assert cmd[:2] == ["rclone", "bisync"]
    _assert_has_consistency_headers(cmd)
    assert "--resilient" in cmd
    assert "--conflict-resolve=newer" in cmd
    assert "--max-delete=25" in cmd
    assert "--compare=modtime" in cmd
    assert "--workdir" in cmd
    assert str(state_path) in cmd


def test_project_bisync_requires_resync_first_time(tmp_path):
    filter_path = _write_filter_file(tmp_path)
    state_path = tmp_path / "state"
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    with pytest.raises(RcloneError) as exc_info:
        project_bisync(
            project,
            "my-bucket",
            is_installed=lambda: True,
            version=(1, 64, 2),
            filter_path=filter_path,
            state_path=state_path,
            is_initialized=lambda _name: False,
        )

    assert "requires --resync" in str(exc_info.value)


def test_project_bisync_with_resync_flag(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    state_path = tmp_path / "state"
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    result = project_bisync(
        project,
        "my-bucket",
        resync=True,
        run=runner,
        is_installed=lambda: True,
        version=(1, 64, 2),
        filter_path=filter_path,
        state_path=state_path,
        is_initialized=lambda _name: False,
    )

    assert result is True
    cmd, _ = runner.calls[0]
    assert "--resync" in cmd


def test_project_bisync_dry_run_skips_init_check(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    state_path = tmp_path / "state"
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    result = project_bisync(
        project,
        "my-bucket",
        dry_run=True,
        run=runner,
        is_installed=lambda: True,
        version=(1, 64, 2),
        filter_path=filter_path,
        state_path=state_path,
        is_initialized=lambda _name: False,
    )

    assert result is True
    cmd, _ = runner.calls[0]
    assert "--dry-run" in cmd


def test_project_bisync_no_local_path():
    project = SyncProject(name="research", path="app/data/research")
    with pytest.raises(RcloneError) as exc_info:
        project_bisync(project, "my-bucket", is_installed=lambda: True)
    assert "no local_sync_path configured" in str(exc_info.value)


def test_project_bisync_checks_rclone_installed(tmp_path):
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )
    with pytest.raises(RcloneError) as exc_info:
        project_bisync(
            project,
            "my-bucket",
            is_installed=lambda: False,
            filter_path=_write_filter_file(tmp_path),
            state_path=tmp_path / "state",
            is_initialized=lambda _name: True,
        )
    assert "rclone is not installed" in str(exc_info.value)


def test_project_bisync_includes_empty_dirs_flag_when_supported(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    state_path = tmp_path / "state"
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    project_bisync(
        project,
        "my-bucket",
        run=runner,
        is_installed=lambda: True,
        version=(1, 64, 2),
        filter_path=filter_path,
        state_path=state_path,
        is_initialized=lambda _name: True,
    )

    cmd, _ = runner.calls[0]
    assert "--create-empty-src-dirs" in cmd


def test_project_bisync_excludes_empty_dirs_flag_when_not_supported(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    state_path = tmp_path / "state"
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    project_bisync(
        project,
        "my-bucket",
        run=runner,
        is_installed=lambda: True,
        version=(1, 60, 1),
        filter_path=filter_path,
        state_path=state_path,
        is_initialized=lambda _name: True,
    )

    cmd, _ = runner.calls[0]
    assert "--create-empty-src-dirs" not in cmd


def test_project_check_success(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    result = project_check(
        project, "my-bucket", run=runner, is_installed=lambda: True, filter_path=filter_path
    )
    assert result is True
    cmd, kwargs = runner.calls[0]
    assert cmd[:2] == ["rclone", "check"]
    _assert_has_consistency_headers(cmd)
    assert kwargs["capture_output"] is True
    assert kwargs["text"] is True


def test_project_check_with_one_way(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    project_check(
        project,
        "my-bucket",
        one_way=True,
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert "--one-way" in cmd


def test_project_check_checks_rclone_installed():
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )
    with pytest.raises(RcloneError) as exc_info:
        project_check(project, "my-bucket", is_installed=lambda: False)
    assert "rclone is not installed" in str(exc_info.value)


def test_project_ls_success():
    runner = _Runner(returncode=0, stdout="file1.md\nfile2.md\nsubdir/file3.md\n")
    project = SyncProject(name="research", path="app/data/research")
    files = project_ls(project, "my-bucket", run=runner, is_installed=lambda: True)
    assert files == ["file1.md", "file2.md", "subdir/file3.md"]
    cmd, _ = runner.calls[0]
    _assert_has_consistency_headers(cmd)


def test_project_ls_with_subpath():
    runner = _Runner(returncode=0, stdout="")
    project = SyncProject(name="research", path="/research")
    project_ls(project, "my-bucket", path="subdir", run=runner, is_installed=lambda: True)

    cmd, kwargs = runner.calls[0]
    assert cmd[-1] == "basic-memory-cloud:my-bucket/research/subdir"
    assert kwargs["check"] is True


def test_project_ls_checks_rclone_installed():
    project = SyncProject(name="research", path="app/data/research")
    with pytest.raises(RcloneError) as exc_info:
        project_ls(project, "my-bucket", is_installed=lambda: False)
    assert "rclone is not installed" in str(exc_info.value)


def test_check_rclone_installed_success():
    check_rclone_installed(is_installed=lambda: True)


def test_check_rclone_installed_not_found():
    with pytest.raises(RcloneError) as exc_info:
        check_rclone_installed(is_installed=lambda: False)

    error_msg = str(exc_info.value)
    assert "rclone is not installed" in error_msg
    assert "bm cloud setup" in error_msg
    assert "https://rclone.org/downloads/" in error_msg


def test_get_rclone_version_parses_standard_version():
    get_rclone_version.cache_clear()
    runner = _Runner(stdout="rclone v1.64.2\n- os/version: darwin 23.0.0\n- os/arch: arm64\n")
    assert get_rclone_version(run=runner) == (1, 64, 2)


def test_get_rclone_version_parses_dev_version():
    get_rclone_version.cache_clear()
    runner = _Runner(stdout="rclone v1.60.1-DEV\n- os/version: linux 5.15.0\n")
    assert get_rclone_version(run=runner) == (1, 60, 1)


def test_get_rclone_version_handles_invalid_output():
    get_rclone_version.cache_clear()
    runner = _Runner(stdout="not a valid version string")
    assert get_rclone_version(run=runner) is None


def test_get_rclone_version_handles_exception():
    get_rclone_version.cache_clear()

    def bad_run(_cmd, **_kwargs):
        raise Exception("Command failed")

    assert get_rclone_version(run=bad_run) is None


def test_get_rclone_version_handles_timeout():
    get_rclone_version.cache_clear()
    from subprocess import TimeoutExpired

    def bad_run(_cmd, **_kwargs):
        raise TimeoutExpired(cmd="rclone version", timeout=10)

    assert get_rclone_version(run=bad_run) is None


def test_supports_create_empty_src_dirs_true_for_new_version():
    assert supports_create_empty_src_dirs((1, 64, 2)) is True


def test_supports_create_empty_src_dirs_true_for_exact_min_version():
    assert supports_create_empty_src_dirs((1, 64, 0)) is True


def test_supports_create_empty_src_dirs_false_for_old_version():
    assert supports_create_empty_src_dirs((1, 60, 1)) is False


def test_supports_create_empty_src_dirs_false_for_unknown_version():
    assert supports_create_empty_src_dirs(None) is False


def test_min_rclone_version_constant():
    assert MIN_RCLONE_VERSION_EMPTY_DIRS == (1, 64, 0)


def test_project_sync_includes_no_preallocate_flag(tmp_path):
    """Sync command includes --local-no-preallocate to prevent NUL byte padding."""
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    project_sync(
        project,
        "my-bucket",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert "--local-no-preallocate" in cmd


def test_project_bisync_includes_no_preallocate_flag(tmp_path):
    """Bisync command includes --local-no-preallocate to prevent NUL byte padding."""
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    state_path = tmp_path / "state"
    project = SyncProject(
        name="research", path="app/data/research", local_sync_path="/tmp/research"
    )

    project_bisync(
        project,
        "my-bucket",
        run=runner,
        is_installed=lambda: True,
        version=(1, 64, 2),
        filter_path=filter_path,
        state_path=state_path,
        is_initialized=lambda _name: True,
    )

    cmd, _ = runner.calls[0]
    assert "--local-no-preallocate" in cmd


# --- Directional transfer primitives (push / pull, issue #858) ---


def test_parse_check_combined_classifies_lines():
    output = "= same.md\n+ only-src.md\n- only-dst.md\n* differ.md\n! broken.md\n\n"
    plan = _parse_check_combined(output)
    assert plan.new == ["only-src.md"]
    assert plan.dest_only == ["only-dst.md"]
    assert plan.conflicts == ["differ.md"]
    assert plan.errors == ["broken.md"]


def test_parse_check_combined_handles_paths_with_spaces():
    plan = _parse_check_combined("* notes/my file.md\n")
    assert plan.conflicts == ["notes/my file.md"]


def test_conflict_copy_name_inserts_marker_before_extension():
    assert _conflict_copy_name("notes/x.md", "20260608-1030") == "notes/x.conflict-20260608-1030.md"
    assert _conflict_copy_name("top.md", "S") == "top.conflict-S.md"


def test_project_diff_pull_uses_remote_as_source(tmp_path):
    runner = _Runner(returncode=1, stdout="+ a.md\n* b.md\n")
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    plan = project_diff(
        project,
        "my-bucket",
        "pull",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, kwargs = runner.calls[0]
    assert cmd[:2] == ["rclone", "check"]
    # pull: cloud is the source so "+" files (only on source) come down to local
    assert cmd[2] == "basic-memory-cloud:my-bucket/research"
    assert Path(cmd[3]) == Path("/tmp/research")
    assert "--combined" in cmd and cmd[cmd.index("--combined") + 1] == "-"
    _assert_has_consistency_headers(cmd)
    assert "--filter-from" in cmd
    assert kwargs["capture_output"] is True
    # rclone exits non-zero when files differ; we parse output rather than trust it
    assert plan.new == ["a.md"]
    assert plan.conflicts == ["b.md"]


def test_project_diff_push_uses_local_as_source(tmp_path):
    runner = _Runner(returncode=0, stdout="")
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    project_diff(
        project,
        "my-bucket",
        "push",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert Path(cmd[2]) == Path("/tmp/research")
    assert cmd[3] == "basic-memory-cloud:my-bucket/research"


def test_project_copy_pull_new_only_adds_ignore_existing(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    result = project_copy(
        project,
        "my-bucket",
        "pull",
        overwrite=False,
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    assert result is True
    cmd, _ = runner.calls[0]
    assert cmd[:2] == ["rclone", "copy"]
    assert cmd[2] == "basic-memory-cloud:my-bucket/research"
    assert Path(cmd[3]) == Path("/tmp/research")
    assert "--ignore-existing" in cmd
    assert "--local-no-preallocate" in cmd
    # new-only skips by existence, so no content comparison is needed
    assert "--checksum" not in cmd


def test_project_copy_pull_overwrite_omits_ignore_existing(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    project_copy(
        project,
        "my-bucket",
        "pull",
        overwrite=True,
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert "--ignore-existing" not in cmd
    # overwrite compares by content so it matches hash-based conflict detection
    assert "--checksum" in cmd


def test_project_copy_push_uses_local_as_source(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    project_copy(
        project,
        "my-bucket",
        "push",
        overwrite=False,
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert Path(cmd[2]) == Path("/tmp/research")
    assert cmd[3] == "basic-memory-cloud:my-bucket/research"


def test_project_copy_file_pull_copyto_renames_on_dest(tmp_path):
    runner = _Runner(returncode=0)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    project_copy_file(
        project,
        "my-bucket",
        "pull",
        "notes/dup.md",
        "notes/dup.conflict-S.md",
        run=runner,
        is_installed=lambda: True,
    )

    cmd, _ = runner.calls[0]
    assert cmd[:2] == ["rclone", "copyto"]
    assert cmd[2] == "basic-memory-cloud:my-bucket/research/notes/dup.md"
    # Compare the local dest via Path so the assertion holds on Windows, where the
    # local root renders with backslashes (rclone accepts the mixed separators).
    assert Path(cmd[3]) == Path("/tmp/research/notes/dup.conflict-S.md")
    # pull writes the conflict copy locally → must guard virtual-FS NUL padding
    assert "--local-no-preallocate" in cmd


def test_project_transfer_keep_both_copies_conflicts_then_additive(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")
    plan = TransferPlan(new=["a.md"], conflicts=["dup.md"], dest_only=[], errors=[])

    result = project_transfer(
        project,
        "my-bucket",
        "pull",
        plan,
        strategy="keep-both",
        conflict_suffix="S",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    assert result is True
    # First a copyto for the conflict file, written beside the local copy...
    first_cmd, _ = runner.calls[0]
    assert first_cmd[:2] == ["rclone", "copyto"]
    # Path comparison so this holds on Windows (backslash local root).
    assert Path(first_cmd[3]) == Path("/tmp/research/dup.conflict-S.md")
    # ...then an additive (new-only) copy that won't overwrite existing local files.
    second_cmd, _ = runner.calls[1]
    assert second_cmd[:2] == ["rclone", "copy"]
    assert "--ignore-existing" in second_cmd


def test_project_transfer_keep_cloud_on_pull_overwrites_local(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")
    plan = TransferPlan(new=[], conflicts=["dup.md"], dest_only=[], errors=[])

    project_transfer(
        project,
        "my-bucket",
        "pull",
        plan,
        strategy="keep-cloud",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    # keep-cloud + pull → cloud (source) overwrites local (dest): no --ignore-existing,
    # and --checksum so the overwrite decision matches the content-based conflict.
    assert len(runner.calls) == 1
    cmd, _ = runner.calls[0]
    assert cmd[:2] == ["rclone", "copy"]
    assert "--ignore-existing" not in cmd
    assert "--checksum" in cmd


def test_project_transfer_keep_local_on_push_overwrites_cloud(tmp_path):
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")
    plan = TransferPlan(new=[], conflicts=["dup.md"], dest_only=[], errors=[])

    project_transfer(
        project,
        "my-bucket",
        "push",
        plan,
        strategy="keep-local",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert "--ignore-existing" not in cmd


def test_project_diff_requires_local_path():
    project = SyncProject(name="research", path="/research")
    with pytest.raises(RcloneError):
        project_diff(project, "my-bucket", "pull", is_installed=lambda: True)


def test_project_diff_raises_on_fatal_check_error(tmp_path):
    """A non-zero exit with no combined listing means the check failed, not 'no diffs'."""
    runner = _Runner(returncode=7, stdout="", stderr="Failed to create file system: AccessDenied")
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    with pytest.raises(RcloneError) as exc_info:
        project_diff(
            project,
            "my-bucket",
            "pull",
            run=runner,
            is_installed=lambda: True,
            filter_path=filter_path,
        )

    assert "AccessDenied" in str(exc_info.value)


def test_project_diff_nonzero_with_differences_does_not_raise(tmp_path):
    """Differences make rclone check exit non-zero, but that is expected — no raise."""
    runner = _Runner(returncode=1, stdout="* changed.md\n")
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")

    plan = project_diff(
        project,
        "my-bucket",
        "pull",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    assert plan.conflicts == ["changed.md"]


def test_project_transfer_keep_local_on_pull_preserves_local(tmp_path):
    """keep-local + pull → local is the destination and must be preserved (--ignore-existing)."""
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")
    plan = TransferPlan(new=[], conflicts=["dup.md"], dest_only=[], errors=[])

    project_transfer(
        project,
        "my-bucket",
        "pull",
        plan,
        strategy="keep-local",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert "--ignore-existing" in cmd
    assert "--checksum" not in cmd


def test_project_transfer_keep_cloud_on_push_preserves_cloud(tmp_path):
    """keep-cloud + push → cloud is the destination and must be preserved (--ignore-existing)."""
    runner = _Runner(returncode=0)
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")
    plan = TransferPlan(new=[], conflicts=["dup.md"], dest_only=[], errors=[])

    project_transfer(
        project,
        "my-bucket",
        "push",
        plan,
        strategy="keep-cloud",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    cmd, _ = runner.calls[0]
    assert "--ignore-existing" in cmd


def test_project_transfer_keep_both_returns_false_on_copy_failure(tmp_path):
    """A failed conflict-copy aborts the transfer before the additive pass."""
    runner = _Runner(returncode=1)  # every rclone invocation fails
    filter_path = _write_filter_file(tmp_path)
    project = SyncProject(name="research", path="/research", local_sync_path="/tmp/research")
    plan = TransferPlan(new=["a.md"], conflicts=["dup.md"], dest_only=[], errors=[])

    result = project_transfer(
        project,
        "my-bucket",
        "pull",
        plan,
        strategy="keep-both",
        conflict_suffix="S",
        run=runner,
        is_installed=lambda: True,
        filter_path=filter_path,
    )

    assert result is False
    # Stopped after the first failed copyto — the additive copy never ran.
    assert len(runner.calls) == 1
    assert runner.calls[0][0][:2] == ["rclone", "copyto"]