import errno
import os
import stat
import subprocess
import sys
from copy import deepcopy
from datetime import datetime, timedelta, timezone
from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest
import yaml

from semantica.context.agent_memory import AgentMemory

_ERROR_PRIVILEGE_NOT_HELD = 1314


class TrackingVectorStore:
    def __init__(self):
        self.items = {}
        self.events = []
        self.fail_after_add = False

    def add(self, items):
        memory_ids = []
        for item in items:
            self.items[item.memory_id] = deepcopy(item)
            memory_ids.append(item.memory_id)
        self.events.append(("add", memory_ids))
        if self.fail_after_add:
            raise RuntimeError("vector add failed after mutation")
        return memory_ids

    def delete(self, memory_ids):
        self.events.append(("delete", list(memory_ids)))
        for memory_id in memory_ids:
            self.items.pop(memory_id, None)
        return True


class TrackingConcreteVectorStore:
    def __init__(self):
        self.events = []
        self.next_id = 0

    def store_vectors(self, vectors, metadata):
        vector_id = f"vec_{self.next_id}"
        self.next_id += 1
        self.events.append(("store", vector_id))
        return [vector_id]

    def delete_vectors(self, vector_ids):
        self.events.append(("delete", list(vector_ids)))
        return True


def markdown_document(frontmatter, body=""):
    yaml_text = yaml.safe_dump(frontmatter, sort_keys=False, allow_unicode=True)
    return f"---\n{yaml_text}---\n\n{body}"


def _require_symlink_support(tmp_path):
    """Skip the test if this environment cannot create symbolic links.

    Symlink creation can be unavailable even on POSIX (e.g. restricted
    containers) and commonly requires elevated privilege or Developer Mode
    on Windows. Probe actual capability instead of assuming based on
    platform, so these tests still run wherever symlinks genuinely work.
    """
    probe_target = tmp_path / ".symlink_probe_target"
    probe_link = tmp_path / ".symlink_probe_link"
    probe_target.write_text("", encoding="utf-8")
    try:
        probe_link.symlink_to(probe_target)
    except OSError as exc:
        pytest.skip(f"environment cannot create symbolic links: {exc}")
    probe_link.unlink()
    probe_target.unlink()


def required_frontmatter(memory_id="mem_test", **overrides):
    frontmatter = {
        "id": memory_id,
        "created_at": "2026-07-22T09:00:00+00:00",
        "updated_at": "2026-07-22T10:00:00+00:00",
        "type": "note",
    }
    frontmatter.update(overrides)
    return frontmatter


def test_markdown_round_trip_is_lossless_and_deterministic():
    memory = AgentMemory()
    content = "\n# Editable memory\n\n<!-- marker-like body text -->\n\n"
    memory.store(
        content,
        metadata={
            "type": "note",
            "updated_at": "2026-07-22T12:30:00+00:00",
            "source": "caf\u00e9 review",
            "tags": ["alpha", "beta"],
            "id": "metadata-id",
            "kind": "metadata-kind",
        },
        entities=[{"id": "ent_1", "type": "topic", "text": "Memory"}],
        relationships=[
            {
                "source_id": "ent_1",
                "target_id": "ent_2",
                "type": "related_to",
                "confidence": 0.9,
            }
        ],
        memory_id="mem_round_trip",
        timestamp=datetime.fromisoformat("2026-07-22T12:00:00+00:00"),
    )

    exported = memory.export(format="markdown")
    restored = AgentMemory()

    assert restored.import_data(exported, format="markdown") == 1
    assert restored.get("mem_round_trip") == memory.get("mem_round_trip")
    assert restored.export(format="markdown") == exported
    assert "caf\u00e9 review" in exported


def test_markdown_directory_round_trip_uses_one_stable_file_per_memory(tmp_path):
    memory = AgentMemory()
    for index in range(2):
        timestamp = f"2026-07-22T0{index + 8}:00:00"
        memory.store(
            f"Memory {index}",
            metadata={
                "type": "reference",
                "updated_at": timestamp,
                "source": f"source-{index}",
            },
            memory_id=f"mem_{index}",
            timestamp=datetime.fromisoformat(timestamp),
        )

    first_export = tmp_path / "first"
    assert memory.export(format="markdown", destination=first_export) == str(
        first_export
    )
    first_files = sorted(first_export.glob("*.md"))
    assert len(first_files) == 2

    restored = AgentMemory()
    assert restored.import_data(first_export, format="markdown") == 2
    assert set(restored.memory_items) == {"mem_0", "mem_1"}

    second_export = tmp_path / "second"
    restored.export(format="markdown", destination=second_export)
    assert {path.name: path.read_text(encoding="utf-8") for path in first_files} == {
        path.name: path.read_text(encoding="utf-8")
        for path in sorted(second_export.glob("*.md"))
    }


def test_multiple_memories_require_a_destination_but_filters_can_select_one():
    memory = AgentMemory()
    for memory_type in ("note", "reference"):
        memory.store(
            memory_type,
            metadata={
                "type": memory_type,
                "updated_at": "2026-07-22T10:00:00",
            },
            memory_id=f"mem_{memory_type}",
            timestamp=datetime(2026, 7, 22, 9, 0, 0),
        )

    with pytest.raises(ValueError, match="destination"):
        memory.export(format="markdown")

    exported = memory.export(format="markdown", type="note")
    assert "id: mem_note" in exported
    assert "id: mem_reference" not in exported


def test_markdown_update_replaces_supported_fields_and_preserves_id():
    memory = AgentMemory()
    memory.store(
        "Original content",
        metadata={
            "type": "note",
            "updated_at": "2026-07-22T09:30:00",
            "remove_me": True,
        },
        memory_id="mem_existing",
        timestamp=datetime(2026, 7, 22, 9, 0, 0),
    )
    edited = markdown_document(
        required_frontmatter(
            "mem_existing",
            created_at="2026-07-22T09:15:00",
            updated_at="2026-07-22T11:00:00",
            type="decision",
            source="manual edit",
        ),
        "Updated content",
    )

    assert memory.import_data(edited, format="markdown") == 1

    updated = memory.get("mem_existing")
    assert memory.count() == 1
    assert updated["memory_id"] == "mem_existing"
    assert updated["content"] == "Updated content"
    assert updated["timestamp"] == "2026-07-22T09:15:00"
    assert updated["metadata"] == {
        "type": "decision",
        "source": "manual edit",
        "updated_at": "2026-07-22T11:00:00",
    }
    assert memory.stats["items_by_type"] == {"decision": 1}
    assert [item.memory_id for item in memory.short_term_memory] == ["mem_existing"]


def test_public_update_preserves_id_and_statistics():
    memory = AgentMemory()
    memory.store(
        "Original",
        metadata={"type": "note"},
        memory_id="mem_update",
        timestamp=datetime(2026, 7, 22, 9, 0, 0),
    )

    assert memory.update("mem_update", content="Updated", metadata={"type": "decision"})
    assert memory.get("mem_update")["content"] == "Updated"
    assert set(memory.memory_items) == {"mem_update"}
    assert list(memory.memory_index) == ["mem_update"]
    assert memory.stats["total_items"] == 1
    assert memory.stats["items_by_type"] == {"decision": 1}


def test_reusing_custom_id_replaces_item_without_statistics_drift():
    vector_store = TrackingVectorStore()
    memory = AgentMemory(vector_store=vector_store)
    memory.store(
        "Original",
        metadata={"type": "note"},
        memory_id="mem_reused",
        timestamp=datetime(2026, 7, 22, 9, 0, 0),
    )

    vector_store.events.clear()
    memory.store(
        "Replacement",
        metadata={"type": "decision"},
        memory_id="mem_reused",
        timestamp=datetime(2026, 7, 22, 10, 0, 0),
    )

    assert memory.get("mem_reused")["content"] == "Replacement"
    assert list(memory.memory_index) == ["mem_reused"]
    assert [item.memory_id for item in memory.short_term_memory] == ["mem_reused"]
    assert memory.stats["total_items"] == 1
    assert memory.stats["items_by_type"] == {"decision": 1}
    assert vector_store.items["mem_reused"].content == "Replacement"
    assert vector_store.events == [("add", ["mem_reused"])]

    assert memory.delete_memory("mem_reused")
    assert memory.stats["total_items"] == 0
    assert memory.stats["items_by_type"] == {}
    assert vector_store.items == {}


def test_reimporting_unchanged_markdown_does_not_rewrite_memory():
    memory = AgentMemory()
    document = markdown_document(required_frontmatter(), "Unchanged")
    assert memory.import_data(document, format="markdown") == 1
    before = memory.get("mem_test")

    with patch.object(
        memory, "_replace_memory_item", wraps=memory._replace_memory_item
    ) as replace:
        assert memory.import_data(document, format="markdown") == 1

    replace.assert_not_called()
    assert memory.get("mem_test") == before
    assert memory.count() == 1


def test_naive_and_aware_equivalent_timestamps_match_idempotently():
    memory = AgentMemory()
    utc_dt = datetime(2026, 7, 22, 9, 0, 0, tzinfo=timezone.utc)
    naive_dt = utc_dt.astimezone().replace(tzinfo=None)
    memory.store(
        "Unchanged",
        metadata={"type": "note", "updated_at": "2026-07-22T10:00:00+00:00"},
        memory_id="mem_test",
        timestamp=naive_dt,
    )
    document = markdown_document(
        required_frontmatter("mem_test", created_at="2026-07-22T09:00:00+00:00"),
        "Unchanged",
    )

    with patch.object(
        memory, "_replace_memory_item", wraps=memory._replace_memory_item
    ) as replace:
        assert memory.import_data(document, format="markdown") == 1

    replace.assert_not_called()


def test_kind_is_accepted_as_the_type_alias():
    frontmatter = required_frontmatter()
    frontmatter["kind"] = frontmatter.pop("type")

    memory = AgentMemory()
    assert (
        memory.import_data(
            markdown_document(frontmatter, "Kind alias"), format="markdown"
        )
        == 1
    )
    assert memory.get("mem_test")["metadata"]["type"] == "note"


@pytest.mark.parametrize("missing_field", ["id", "created_at", "updated_at", "type"])
def test_required_frontmatter_fields_are_enforced(missing_field):
    frontmatter = required_frontmatter()
    frontmatter.pop(missing_field)

    with pytest.raises(ValueError, match="missing required"):
        AgentMemory().import_data(
            markdown_document(frontmatter, "Invalid"), format="markdown"
        )


@pytest.mark.parametrize(
    ("overrides", "message"),
    [
        ({"id": 123}, "'id' must be a string"),
        ({"created_at": "yesterday"}, "ISO-8601"),
        ({"updated_at": "later"}, "ISO-8601"),
        ({"type": ["note"]}, "must be a string"),
        ({"kind": "decision"}, "must match"),
        ({"metadata": []}, "must be a mapping"),
        ({"entities": {}}, "must be a list"),
        ({"entities": ["entity"]}, "must be a mapping"),
        ({"relationships": [1]}, "must be a mapping"),
        ({"metadata": {"type": "nested"}}, "duplicates reserved"),
        ({"metadata": {"source": "nested"}, "source": "top"}, "defined both"),
    ],
)
def test_invalid_frontmatter_values_return_actionable_errors(overrides, message):
    document = markdown_document(required_frontmatter(**overrides), "Invalid")

    with pytest.raises(ValueError, match=message):
        AgentMemory().import_data(document, format="markdown")


@pytest.mark.parametrize(
    "document",
    [
        "not frontmatter",
        "---\nid: broken",
        "---\nid: [unterminated\n---\n",
        (
            "---\nid: first\nid: second\ncreated_at: 2026-07-22T09:00:00\n"
            "updated_at: 2026-07-22T10:00:00\ntype: note\n---\n"
        ),
    ],
)
def test_malformed_frontmatter_is_rejected(document):
    with pytest.raises(ValueError, match="frontmatter"):
        AgentMemory().import_data(document, format="markdown")


def test_directory_is_fully_validated_before_any_memory_is_changed(tmp_path):
    valid = markdown_document(required_frontmatter("mem_valid"), "Valid")
    invalid_fields = required_frontmatter("mem_invalid")
    invalid_fields.pop("updated_at")
    invalid = markdown_document(invalid_fields, "Invalid")
    (tmp_path / "a-valid.md").write_text(valid, encoding="utf-8")
    (tmp_path / "z-invalid.md").write_text(invalid, encoding="utf-8")

    memory = AgentMemory()
    with pytest.raises(ValueError, match="updated_at"):
        memory.import_data(tmp_path, format="markdown")

    assert memory.count() == 0


def test_duplicate_ids_in_a_directory_are_rejected_before_import(tmp_path):
    document = markdown_document(required_frontmatter("mem_duplicate"), "Body")
    (tmp_path / "first.md").write_text(document, encoding="utf-8")
    (tmp_path / "second.markdown").write_text(document, encoding="utf-8")

    memory = AgentMemory()
    with pytest.raises(ValueError, match="Duplicate Markdown memory ID"):
        memory.import_data(tmp_path, format="markdown")

    assert memory.count() == 0


def test_markdown_import_keeps_provenance_out_of_the_context_graph():
    knowledge_graph = MagicMock()
    memory = AgentMemory(knowledge_graph=knowledge_graph)
    fields = required_frontmatter(
        entities=[{"id": "entity_1", "type": "topic"}],
        relationships=[
            {
                "source_id": "entity_1",
                "target_id": "entity_2",
                "type": "related_to",
            }
        ],
    )

    assert (
        memory.import_data(markdown_document(fields, "Provenance"), format="markdown")
        == 1
    )
    assert memory.get("mem_test")["entities"][0]["id"] == "entity_1"
    knowledge_graph.add_nodes.assert_not_called()
    knowledge_graph.add_edges.assert_not_called()


def test_operational_failure_restores_existing_in_memory_state():
    memory = AgentMemory()
    memory.store(
        "Original",
        metadata={
            "type": "note",
            "updated_at": "2026-07-22T09:30:00",
        },
        memory_id="mem_existing",
        timestamp=datetime(2026, 7, 22, 9, 0, 0),
    )
    before_memory = deepcopy(memory.get("mem_existing"))
    before_stats = deepcopy(memory.stats)
    edited_fields = required_frontmatter("mem_existing")
    original_store = memory.store

    def fail_after_store(*args, **kwargs):
        original_store(*args, **kwargs)
        raise RuntimeError("store unavailable")

    with patch.object(memory, "store", side_effect=fail_after_store):
        with pytest.raises(RuntimeError, match="store unavailable"):
            memory.import_data(
                markdown_document(edited_fields, "Edited"), format="markdown"
            )

    assert memory.get("mem_existing") == before_memory
    assert memory.stats == before_stats
    assert list(memory.memory_index) == ["mem_existing"]
    assert [item.memory_id for item in memory.short_term_memory] == ["mem_existing"]


def test_failed_markdown_update_does_not_mutate_vector_store_before_rollback():
    vector_store = TrackingVectorStore()
    memory = AgentMemory(vector_store=vector_store)
    memory.store(
        "Original",
        metadata={"type": "note"},
        memory_id="mem_existing",
        timestamp=datetime(2026, 7, 22, 9, 0, 0),
    )
    vector_store.events.clear()
    original_store = memory.store

    def fail_after_local_store(*args, **kwargs):
        original_store(*args, **kwargs)
        raise RuntimeError("local store failed")

    with patch.object(memory, "store", side_effect=fail_after_local_store):
        with pytest.raises(RuntimeError, match="local store failed"):
            memory.import_data(
                markdown_document(required_frontmatter("mem_existing"), "Replacement"),
                format="markdown",
            )

    assert memory.get("mem_existing")["content"] == "Original"
    assert vector_store.items["mem_existing"].content == "Original"
    assert vector_store.events == []


def test_vector_sync_runs_after_markdown_commit_and_never_triggers_rollback():
    vector_store = TrackingVectorStore()
    memory = AgentMemory(vector_store=vector_store)
    memory.store(
        "Original",
        metadata={"type": "note"},
        memory_id="mem_existing",
        timestamp=datetime(2026, 7, 22, 9, 0, 0),
    )
    vector_store.events.clear()
    vector_store.fail_after_add = True

    assert (
        memory.import_data(
            markdown_document(required_frontmatter("mem_existing"), "Replacement"),
            format="markdown",
        )
        == 1
    )

    assert memory.get("mem_existing")["content"] == "Replacement"
    assert vector_store.items["mem_existing"].content == "Replacement"
    assert vector_store.events == [("add", ["mem_existing"])]


def test_markdown_update_replaces_concrete_adapter_vector_id_after_commit():
    vector_store = TrackingConcreteVectorStore()
    memory = AgentMemory(vector_store=vector_store)
    memory.store(
        "Original",
        metadata={"type": "note"},
        memory_id="mem_existing",
        timestamp=datetime(2026, 7, 22, 9, 0, 0),
    )
    assert memory._vector_ids == {"mem_existing": ["vec_0"]}
    vector_store.events.clear()

    assert (
        memory.import_data(
            markdown_document(required_frontmatter("mem_existing"), "Replacement"),
            format="markdown",
        )
        == 1
    )

    assert memory._vector_ids == {"mem_existing": ["vec_1"]}
    assert vector_store.events == [("store", "vec_1"), ("delete", ["vec_0"])]


def test_vector_id_mapping_survives_save_and_load(tmp_path):
    vector_store = TrackingConcreteVectorStore()
    memory = AgentMemory(vector_store=vector_store)
    memory.store(
        "Persisted",
        metadata={"type": "note"},
        memory_id="mem_persisted",
    )
    memory.save(str(tmp_path))

    restored = AgentMemory(vector_store=vector_store)
    restored.load(str(tmp_path))
    vector_store.events.clear()

    assert restored._vector_ids == {"mem_persisted": ["vec_0"]}
    assert restored.delete_memory("mem_persisted")
    assert vector_store.events == [("delete", ["vec_0"])]


def test_failed_multi_file_import_never_starts_vector_synchronization(tmp_path):
    vector_store = TrackingVectorStore()
    memory = AgentMemory(vector_store=vector_store)
    for name in ("a-first.md", "b-second.md"):
        memory_id = name[:-3]
        (tmp_path / name).write_text(
            markdown_document(required_frontmatter(memory_id), name),
            encoding="utf-8",
        )

    original_store = memory.store
    calls = 0

    def fail_on_second_store(*args, **kwargs):
        nonlocal calls
        calls += 1
        stored_id = original_store(*args, **kwargs)
        if calls == 2:
            raise RuntimeError("second local store failed")
        return stored_id

    with patch.object(memory, "store", side_effect=fail_on_second_store):
        with pytest.raises(RuntimeError, match="second local store failed"):
            memory.import_data(tmp_path, format="markdown")

    assert memory.count() == 0
    assert vector_store.events == []
    assert vector_store.items == {}


def test_import_does_not_report_retention_pruned_memory_as_successful():
    memory = AgentMemory(retention_policy="1_days")
    fields = required_frontmatter(
        "mem_expired",
        created_at="2000-01-01T00:00:00",
        updated_at="2000-01-01T00:00:00",
    )

    with pytest.raises(RuntimeError, match="did not confirm"):
        memory.import_data(markdown_document(fields, "Expired"), format="markdown")

    assert memory.count() == 0
    assert memory.stats["total_items"] == 0


def test_timezone_aware_import_supports_retention_sorting_and_date_filters():
    now_utc = datetime.now(timezone.utc)
    memory = AgentMemory(retention_policy="1_days")
    memory.store(
        "Naive memory",
        metadata={"type": "note"},
        memory_id="mem_naive",
        timestamp=datetime.now(),
    )
    fields = required_frontmatter(
        "mem_aware",
        created_at=now_utc.isoformat(),
        updated_at=now_utc.isoformat(),
    )

    assert (
        memory.import_data(markdown_document(fields, "Aware memory"), "markdown") == 1
    )
    assert memory.get("mem_aware")["timestamp"].endswith("+00:00")
    assert {item["memory_id"] for item in memory.get_recent()} == {
        "mem_naive",
        "mem_aware",
    }

    start = now_utc - timedelta(hours=1)
    end = now_utc + timedelta(hours=1)
    assert {item["memory_id"] for item in memory.get_by_date(start, end)} == {
        "mem_naive",
        "mem_aware",
    }
    assert {
        item["memory_id"]
        for item in memory.retrieve(
            "memory", start_date=start.isoformat(), end_date=end.isoformat()
        )
    } == {"mem_naive", "mem_aware"}


def test_exported_filenames_cannot_escape_or_collide_with_destination(tmp_path):
    memory = AgentMemory()
    for memory_id in ("../outside", "a/b", "a\\b", "A/B"):
        memory.store(
            memory_id,
            metadata={
                "type": "note",
                "updated_at": "2026-07-22T10:00:00",
            },
            memory_id=memory_id,
            timestamp=datetime(2026, 7, 22, 9, 0, 0),
        )

    destination = tmp_path / "export"
    memory.export(format="markdown", destination=destination)
    exported_files = list(destination.glob("*.md"))

    assert len(exported_files) == 4
    assert len({path.name.casefold() for path in exported_files}) == 4
    assert all(path.parent == destination for path in exported_files)
    assert not (tmp_path / "outside.md").exists()


def test_markdown_export_rejects_symlink_without_touching_target(tmp_path):
    memory = AgentMemory()
    memory.store(
        "Protected content",
        metadata={"type": "note", "updated_at": "2026-07-22T10:00:00"},
        memory_id="mem_symlink",
        timestamp=datetime(2026, 7, 22, 9, 0, 0),
    )
    destination = tmp_path / "export"
    destination.mkdir()
    outside = tmp_path / "outside.md"
    outside.write_text("do not overwrite", encoding="utf-8")
    output_path = destination / memory._memory_markdown_filename("mem_symlink")
    try:
        output_path.symlink_to(outside)
    except OSError as error:
        winerror = getattr(error, "winerror", None)
        if sys.platform == "win32" and winerror == _ERROR_PRIVILEGE_NOT_HELD:
            pytest.skip("Windows symlink creation requires an unavailable privilege")
        raise

    with pytest.raises(ValueError, match="symbolic link"):
        memory.export(format="markdown", destination=destination)

    assert output_path.is_symlink()
    assert outside.read_text(encoding="utf-8") == "do not overwrite"


def test_empty_markdown_export_and_import_are_no_ops():
    memory = AgentMemory()

    assert memory.export(format="markdown") == ""
    assert memory.import_data("", format="markdown") == 0


def test_markdown_string_path_read_errors_are_not_treated_as_content(tmp_path):
    source = tmp_path / "memory.md"
    source.write_text(
        markdown_document(required_frontmatter(), "Content"), encoding="utf-8"
    )
    memory = AgentMemory()

    with patch.object(
        memory,
        "_read_markdown_path",
        side_effect=PermissionError("read denied"),
    ):
        with pytest.raises(PermissionError, match="read denied"):
            memory.import_data(str(source), format="markdown")


def test_markdown_string_path_inspection_errors_are_actionable():
    memory = AgentMemory()
    original_error = PermissionError(
        errno.EACCES,
        "inspection denied",
        "blocked-memory.md",
    )

    with patch(
        "semantica.context.agent_memory.Path.exists",
        side_effect=original_error,
    ):
        with pytest.raises(
            OSError, match="Failed to inspect possible Markdown import path"
        ) as exc_info:
            memory.import_data("memory.md", format="markdown")

    assert exc_info.value.errno == errno.EACCES
    assert exc_info.value.filename == "blocked-memory.md"
    assert "inspection denied" in str(exc_info.value)
    assert exc_info.value.__cause__ is original_error


@pytest.mark.parametrize("use_string_path", [False, True])
def test_markdown_import_rejects_symlinked_file(tmp_path, use_string_path):
    _require_symlink_support(tmp_path)
    outside = tmp_path / "outside.md"
    outside.write_text(
        markdown_document(required_frontmatter(), "Do not import"),
        encoding="utf-8",
    )
    source = tmp_path / "memory.md"
    source.symlink_to(outside)
    payload = str(source) if use_string_path else source
    memory = AgentMemory()

    with pytest.raises(ValueError, match="symbolic link"):
        memory.import_data(payload, format="markdown")

    assert memory.count() == 0


@pytest.mark.parametrize("use_string_path", [False, True])
def test_markdown_import_rejects_broken_symlink(tmp_path, use_string_path):
    _require_symlink_support(tmp_path)
    source = tmp_path / "missing-memory.md"
    source.symlink_to(tmp_path / "missing-target.md")
    payload = str(source) if use_string_path else source
    memory = AgentMemory()

    with pytest.raises(ValueError, match="symbolic link"):
        memory.import_data(payload, format="markdown")

    assert memory.count() == 0


@pytest.mark.parametrize("use_string_path", [False, True])
def test_markdown_import_rejects_symlinked_directory(tmp_path, use_string_path):
    _require_symlink_support(tmp_path)
    outside = tmp_path / "outside"
    outside.mkdir()
    (outside / "memory.md").write_text(
        markdown_document(required_frontmatter(), "Do not import"),
        encoding="utf-8",
    )
    source = tmp_path / "memory-export"
    source.symlink_to(outside, target_is_directory=True)
    payload = str(source) if use_string_path else source
    memory = AgentMemory()

    with pytest.raises(ValueError, match="symbolic link"):
        memory.import_data(payload, format="markdown")

    assert memory.count() == 0


def test_markdown_import_skips_symlinked_file_in_directory(tmp_path):
    _require_symlink_support(tmp_path)
    outside = tmp_path / "outside.md"
    outside.write_text(
        markdown_document(required_frontmatter(), "Do not import"),
        encoding="utf-8",
    )
    source = tmp_path / "memory-export"
    source.mkdir()
    (source / "memory.md").symlink_to(outside)
    memory = AgentMemory()

    assert memory.import_data(source, format="markdown") == 0
    assert memory.count() == 0


@pytest.mark.skipif(not hasattr(os, "O_NOFOLLOW"), reason="requires O_NOFOLLOW")
def test_markdown_import_does_not_follow_symlink_raced_before_open(tmp_path):
    _require_symlink_support(tmp_path)
    outside = tmp_path / "outside.md"
    outside.write_text(
        markdown_document(required_frontmatter(), "Do not import"),
        encoding="utf-8",
    )
    source = tmp_path / "memory.md"
    source.symlink_to(outside)

    with patch.object(Path, "is_symlink", return_value=False):
        with pytest.raises(ValueError, match="symbolic link"):
            AgentMemory()._read_markdown_file_content(source)


def test_markdown_import_rejects_windows_junction(tmp_path, monkeypatch):
    source = tmp_path / "junction"
    source.mkdir()
    (source / "memory.md").write_text("not read", encoding="utf-8")

    monkeypatch.setattr(
        os.path,
        "isjunction",
        lambda candidate: Path(candidate) == source,
        raising=False,
    )

    with pytest.raises(ValueError, match="junction"):
        AgentMemory().import_data(source, format="markdown")


def test_markdown_import_rejects_windows_reparse_point_fallback(tmp_path, monkeypatch):
    source = tmp_path / "reparse-point"
    source.mkdir()
    real_lstat = os.lstat

    class ReparseStat:
        st_file_attributes = getattr(stat, "FILE_ATTRIBUTE_REPARSE_POINT", 0x400)

    monkeypatch.delattr(os.path, "isjunction", raising=False)
    monkeypatch.setattr(Path, "is_symlink", lambda self: False)
    monkeypatch.setattr(
        os,
        "lstat",
        lambda candidate: (
            ReparseStat() if Path(candidate) == source else real_lstat(candidate)
        ),
    )

    with pytest.raises(ValueError, match="junction"):
        AgentMemory().import_data(source, format="markdown")


@pytest.mark.skipif(os.name != "nt", reason="requires Windows junctions")
def test_markdown_import_rejects_real_windows_junction(tmp_path):
    outside = tmp_path / "outside"
    outside.mkdir()
    (outside / "memory.md").write_text("not read", encoding="utf-8")
    source = tmp_path / "junction"
    result = subprocess.run(
        ["cmd.exe", "/c", "mklink", "/J", str(source), str(outside)],
        capture_output=True,
        text=True,
        check=False,
    )
    if result.returncode != 0:
        pytest.skip(f"could not create Windows junction: {result.stderr}")

    try:
        with pytest.raises(ValueError, match="junction"):
            AgentMemory().import_data(source, format="markdown")
    finally:
        os.rmdir(source)


def test_legacy_dict_import_behavior_is_unchanged():
    memory = AgentMemory()
    data = {
        "memories": [
            {
                "memory_id": "source_id",
                "content": "Legacy import",
                "metadata": {"type": "note"},
                "timestamp": "2000-01-01T00:00:00",
            }
        ]
    }

    assert memory.import_data(data, format="dict") == 1
    assert not memory.exists("source_id")
    imported = next(iter(memory.memory_items.values()))
    assert imported.content == "Legacy import"
    assert imported.metadata == {"type": "note"}


def test_markdown_export_destination_must_be_a_directory(tmp_path):
    destination = tmp_path / "memory.md"
    destination.write_text("occupied", encoding="utf-8")

    with pytest.raises(ValueError, match="not a directory"):
        AgentMemory().export(format="markdown", destination=destination)


def test_markdown_import_file_open_security_rejects_symlink(tmp_path):
    memory = AgentMemory()
    target = tmp_path / "secret.txt"
    target.write_text("secret content", encoding="utf-8")
    symlink_file = tmp_path / "memory.md"
    try:
        symlink_file.symlink_to(target)
    except OSError as error:
        winerror = getattr(error, "winerror", None)
        if sys.platform == "win32" and winerror == _ERROR_PRIVILEGE_NOT_HELD:
            pytest.skip("Windows symlink creation requires an unavailable privilege")
        raise

    with pytest.raises(ValueError, match="Symlink Markdown import paths are rejected"):
        memory._read_markdown_file_content(symlink_file)


def test_markdown_import_public_api_rejects_symlink(tmp_path):
    """
    import_data(..., format="markdown") must propagate the symlink rejection
    through the full call chain: import_data → _import_markdown_payload →
    _read_markdown_path → _read_markdown_file_content.

    This complements test_markdown_import_file_open_security_rejects_symlink,
    which only tests the private helper.  A future refactor that bypasses
    _read_markdown_file_content would silently stop being protected; this test
    catches that.
    """
    target = tmp_path / "secret.txt"
    target.write_text("secret content", encoding="utf-8")
    symlink_file = tmp_path / "memory.md"
    try:
        symlink_file.symlink_to(target)
    except OSError as error:
        winerror = getattr(error, "winerror", None)
        if sys.platform == "win32" and winerror == _ERROR_PRIVILEGE_NOT_HELD:
            pytest.skip("Windows symlink creation requires an unavailable privilege")
        raise

    memory = AgentMemory()
    with pytest.raises(ValueError, match="Symlink Markdown import paths are rejected"):
        memory.import_data(symlink_file, format="markdown")


def test_markdown_import_directory_silently_skips_symlinked_entries(tmp_path):
    """
    When importing a directory, symlink entries must be silently excluded.
    Only real regular files must be read.

    This tests the filter in _read_markdown_path:
        not file_path.is_symlink()
    which was added by PR #932.
    """
    # Write a real Markdown file in the directory
    real_md = tmp_path / "real.md"
    real_md.write_text(
        markdown_document(required_frontmatter(memory_id="dir-real"), "Real content"),
        encoding="utf-8",
    )
    # Write the symlink target outside the directory
    target = tmp_path.parent / "outside.txt"
    target.write_text("must not be read", encoding="utf-8")
    link_md = tmp_path / "evil.md"
    try:
        link_md.symlink_to(target)
    except OSError as error:
        winerror = getattr(error, "winerror", None)
        if sys.platform == "win32" and winerror == _ERROR_PRIVILEGE_NOT_HELD:
            pytest.skip("Windows symlink creation requires an unavailable privilege")
        raise

    memory = AgentMemory()
    # Must succeed, returning only the real file
    results = memory._read_markdown_path(tmp_path)
    assert len(results) == 1, (
        f"Expected 1 result (real.md only), got {len(results)}: "
        f"{[r[0] for r in results]}"
    )
    assert "Real content" in results[0][1]


def test_markdown_import_rejects_non_regular_file(tmp_path):
    """
    _read_markdown_file_content must raise ValueError when the opened file
    descriptor does not refer to a regular file (S_ISREG fails).

    This tests the fstat()/S_ISREG guard, which is the defense-in-depth layer
    that catches special files (FIFOs, character devices) even when the
    is_symlink() pre-check passes.  The test works on both POSIX and Windows
    because it mocks os.fstat rather than relying on platform-specific
    filesystem objects.
    """
    import stat as stat_module

    real_file = tmp_path / "not_really_regular.md"
    real_file.write_text("some data", encoding="utf-8")

    # Build a mock stat result whose st_mode describes a FIFO (S_IFIFO).
    fake_stat = MagicMock()
    fake_stat.st_mode = stat_module.S_IFIFO | 0o600  # FIFO with rw permissions

    memory = AgentMemory()
    with patch("semantica.context.agent_memory.os.fstat", return_value=fake_stat):
        with pytest.raises(ValueError, match="not a regular file"):
            memory._read_markdown_file_content(real_file)