"""Tests for Phase D — Restore Registry, History Hooks, Trash, Bulk Restore, Retention."""

from __future__ import annotations

import uuid
from datetime import datetime, timezone
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from app.core.restore_registry import (
    RestoreConfig,
    RestoreRegistry,
    get_restore_registry,
    reset_restore_registry_for_testing,
)
from app.core.history_hooks import (
    _extract_entity_id,
    register_history_hooks,
    reset_history_hooks_for_testing,
)
from app.services.entity_history_service import (
    archive_old_history,
    bulk_restore,
    list_trash,
    record_history,
    restore_from_history,
)


# ─── Restore Registry Tests ───


class TestRestoreRegistry:
    """Tests for the RestoreRegistry singleton."""

    def setup_method(self):
        reset_restore_registry_for_testing()

    def test_register_and_get(self):
        reg = get_restore_registry()
        config = RestoreConfig(
            entity_type="test_entity",
            model_class=MagicMock,
            restore_permission="test:write",
        )
        reg.register(config)
        assert reg.get("test_entity") is config

    def test_get_unregistered_returns_none(self):
        reg = get_restore_registry()
        assert reg.get("nonexistent") is None

    def test_is_registered(self):
        reg = get_restore_registry()
        config = RestoreConfig(
            entity_type="test_entity",
            model_class=MagicMock,
            restore_permission="test:write",
        )
        reg.register(config)
        assert reg.is_registered("test_entity") is True
        assert reg.is_registered("nonexistent") is False

    def test_list_registered(self):
        reg = get_restore_registry()
        reg.register(RestoreConfig("alpha", MagicMock, "a:write"))
        reg.register(RestoreConfig("beta", MagicMock, "b:write"))
        assert reg.list_registered() == ["alpha", "beta"]

    def test_overwrite_warns(self, caplog):
        reg = get_restore_registry()
        reg.register(RestoreConfig("test", MagicMock, "t:write"))
        reg.register(RestoreConfig("test", MagicMock, "t:write2"))
        assert reg.get("test").restore_permission == "t:write2"

    def test_excluded_fields_merge(self):
        config = RestoreConfig(
            entity_type="test",
            model_class=MagicMock,
            restore_permission="t:write",
            excluded_fields=frozenset({"custom_field", "secret"}),
        )
        excluded = config.all_excluded_fields
        assert "id" in excluded
        assert "tenant_id" in excluded
        assert "deleted_at" in excluded
        assert "custom_field" in excluded
        assert "secret" in excluded


class TestRestoreFromHistory:
    """Tests for restore_from_history with registry."""

    @pytest.mark.asyncio
    async def test_restore_unsupported_entity_type_raises(self):
        """Restore should raise ValueError for unregistered entity types."""
        reset_restore_registry_for_testing()
        db = AsyncMock()
        tenant_id = uuid.uuid4()
        user_id = uuid.uuid4()
        history_id = uuid.uuid4()

        # Mock get_history_entry to return an entry with unregistered type
        with patch("app.services.entity_history_service.get_history_entry") as mock_get:
            mock_entry = MagicMock()
            mock_entry.entity_type = "unsupported_type"
            mock_entry.entity_id = uuid.uuid4()
            mock_entry.action = "delete"
            mock_get.return_value = mock_entry

            with pytest.raises(ValueError, match="Unsupported entity type"):
                await restore_from_history(db, tenant_id, history_id, user_id)

    @pytest.mark.asyncio
    async def test_restore_history_not_found_raises(self):
        """Restore should raise ValueError if history entry not found."""
        reset_restore_registry_for_testing()
        db = AsyncMock()
        tenant_id = uuid.uuid4()
        user_id = uuid.uuid4()
        history_id = uuid.uuid4()

        with patch("app.services.entity_history_service.get_history_entry") as mock_get:
            mock_get.return_value = None

            with pytest.raises(ValueError, match="History entry not found"):
                await restore_from_history(db, tenant_id, history_id, user_id)


# ─── History Hooks Tests ───


class TestHistoryHooks:
    """Tests for hook-based history recording."""

    def test_extract_entity_id_from_uuid(self):
        eid = uuid.uuid4()
        assert _extract_entity_id({"id": eid}) == eid

    def test_extract_entity_id_from_string(self):
        eid = uuid.uuid4()
        assert _extract_entity_id({"id": str(eid)}) == eid

    def test_extract_entity_id_none(self):
        assert _extract_entity_id(None) is None
        assert _extract_entity_id({}) is None
        assert _extract_entity_id({"id": None}) is None

    def test_extract_entity_id_invalid(self):
        assert _extract_entity_id({"id": "not-a-uuid"}) is None

    def test_register_history_hooks(self):
        """Test that hooks are registered correctly."""
        reset_history_hooks_for_testing()
        from app.core.hooks import get_hook_registry

        reg = get_hook_registry()
        register_history_hooks(
            reg, "test_entity",
            "test_entity.after_create",
            "test_entity.after_update",
            "test_entity.after_delete",
        )

        assert reg.has_action("test_entity.after_create")
        assert reg.has_action("test_entity.after_update")
        assert reg.has_action("test_entity.after_delete")

    @pytest.mark.asyncio
    async def test_history_hook_create_calls_record_history(self):
        """Test that after_create hook calls record_history."""
        reset_history_hooks_for_testing()
        from app.core.hooks import do_action, get_hook_registry

        reg = get_hook_registry()
        register_history_hooks(
            reg, "test_entity",
            "test_entity.after_create",
            "test_entity.after_update",
            "test_entity.after_delete",
        )

        db = AsyncMock()
        tenant_id = uuid.uuid4()
        user_id = uuid.uuid4()
        entity_id = uuid.uuid4()

        with patch("app.core.history_hooks.record_history", new_callable=AsyncMock) as mock_rh:
            await do_action(
                "test_entity.after_create",
                {"id": str(entity_id), "name": "Test"},
                db=db, tenant_id=tenant_id, user_id=user_id,
            )
            mock_rh.assert_called_once()
            call_args = mock_rh.call_args
            # record_history(db, tenant_id, user_id, entity_type, entity_id, action=..., snapshot_after=...)
            # args: (db, tenant_id, user_id, entity_type, entity_id)
            # kwargs: action=..., snapshot_after=...
            assert call_args.args[3] == "test_entity"  # entity_type
            assert call_args.args[4] == entity_id  # entity_id
            assert call_args.kwargs.get("action") == "create"  # action


# ─── Trash List Tests ───


class TestTrashList:
    """Tests for list_trash service function."""

    @pytest.mark.asyncio
    async def test_list_trash_returns_delete_entries(self):
        """list_trash should only return delete actions."""
        db = AsyncMock()
        tenant_id = uuid.uuid4()

        # Mock the query results
        mock_entry1 = MagicMock()
        mock_entry1.id = uuid.uuid4()
        mock_entry1.entity_type = "contact"
        mock_entry1.entity_id = uuid.uuid4()
        mock_entry1.snapshot_before = {"name": "John"}
        mock_entry1.created_at = datetime.now(timezone.utc)
        mock_entry1.user_id = uuid.uuid4()

        mock_result = MagicMock()
        mock_result.scalars.return_value.all.return_value = [mock_entry1]

        mock_count_result = MagicMock()
        mock_count_result.scalar.return_value = 1

        db.execute = AsyncMock(side_effect=[mock_count_result, mock_result])

        result = await list_trash(db, tenant_id, limit=50, offset=0)

        assert result["total"] == 1
        assert len(result["items"]) == 1
        assert result["items"][0]["entity_type"] == "contact"

    @pytest.mark.asyncio
    async def test_list_trash_with_entity_type_filter(self):
        """list_trash should filter by entity_type."""
        db = AsyncMock()
        tenant_id = uuid.uuid4()

        mock_result = MagicMock()
        mock_result.scalars.return_value.all.return_value = []

        mock_count_result = MagicMock()
        mock_count_result.scalar.return_value = 0

        db.execute = AsyncMock(side_effect=[mock_count_result, mock_result])

        result = await list_trash(db, tenant_id, entity_type="task", limit=50, offset=0)

        assert result["total"] == 0
        assert result["items"] == []


# ─── Bulk Restore Tests ───


class TestBulkRestore:
    """Tests for bulk_restore service function."""

    @pytest.mark.asyncio
    async def test_bulk_restore_all_success(self):
        """bulk_restore should succeed for all valid entries."""
        db = AsyncMock()
        tenant_id = uuid.uuid4()
        user_id = uuid.uuid4()
        hid1 = uuid.uuid4()
        hid2 = uuid.uuid4()

        with patch("app.services.entity_history_service.restore_from_history", new_callable=AsyncMock) as mock_restore:
            mock_restore.side_effect = [
                {"id": str(uuid.uuid4()), "_entity_type": "contact", "_restored": True},
                {"id": str(uuid.uuid4()), "_entity_type": "task", "_restored": True},
            ]

            result = await bulk_restore(db, tenant_id, [hid1, hid2], user_id)

        assert result["total"] == 2
        assert result["succeeded"] == 2
        assert result["failed"] == 0
        assert result["partial_success"] is False

    @pytest.mark.asyncio
    async def test_bulk_restore_partial_failure(self):
        """bulk_restore should report partial_success when some fail."""
        db = AsyncMock()
        tenant_id = uuid.uuid4()
        user_id = uuid.uuid4()
        hid1 = uuid.uuid4()
        hid2 = uuid.uuid4()

        with patch("app.services.entity_history_service.restore_from_history", new_callable=AsyncMock) as mock_restore:
            mock_restore.side_effect = [
                {"id": str(uuid.uuid4()), "_entity_type": "contact"},
                ValueError("Entity not found"),
            ]

            result = await bulk_restore(db, tenant_id, [hid1, hid2], user_id)

        assert result["total"] == 2
        assert result["succeeded"] == 1
        assert result["failed"] == 1
        assert result["partial_success"] is True
        assert result["results"][1]["error"] == "Entity not found"

    @pytest.mark.asyncio
    async def test_bulk_restore_all_fail(self):
        """bulk_restore should report no partial_success when all fail."""
        db = AsyncMock()
        tenant_id = uuid.uuid4()
        user_id = uuid.uuid4()

        with patch("app.services.entity_history_service.restore_from_history", new_callable=AsyncMock) as mock_restore:
            mock_restore.side_effect = [ValueError("Not found"), ValueError("Not found")]

            result = await bulk_restore(db, tenant_id, [uuid.uuid4(), uuid.uuid4()], user_id)

        assert result["succeeded"] == 0
        assert result["failed"] == 2
        assert result["partial_success"] is False


# ─── Retention Tests ───


class TestRetention:
    """Tests for archive_old_history service function."""

    @pytest.mark.asyncio
    async def test_archive_old_history_returns_count(self):
        """archive_old_history should return the number of archived entries."""
        db = AsyncMock()
        tenant_id = uuid.uuid4()

        mock_result = MagicMock()
        mock_result.rowcount = 42
        db.execute = AsyncMock(return_value=mock_result)

        count = await archive_old_history(db, tenant_id, days=90)

        assert count == 42
        db.flush.assert_called_once()

    @pytest.mark.asyncio
    async def test_archive_old_history_zero_when_none(self):
        """archive_old_history should return 0 when no entries to archive."""
        db = AsyncMock()
        tenant_id = uuid.uuid4()

        mock_result = MagicMock()
        mock_result.rowcount = 0
        db.execute = AsyncMock(return_value=mock_result)

        count = await archive_old_history(db, tenant_id, days=90)

        assert count == 0


# ─── Sensitive Fields Exclusion Tests ───


class TestSensitiveFieldsExclusion:
    """Tests that sensitive fields are excluded from restore."""

    def test_default_excluded_fields(self):
        """Default excluded fields should include id, tenant_id, timestamps."""
        from app.core.restore_registry import _DEFAULT_EXCLUDED

        assert "id" in _DEFAULT_EXCLUDED
        assert "tenant_id" in _DEFAULT_EXCLUDED
        assert "created_at" in _DEFAULT_EXCLUDED
        assert "updated_at" in _DEFAULT_EXCLUDED
        assert "deleted_at" in _DEFAULT_EXCLUDED
        assert "search_tsv" in _DEFAULT_EXCLUDED
        assert "embedding" in _DEFAULT_EXCLUDED

    def test_contact_excluded_fields(self):
        """Contact should exclude search_tsv, embedding, and relationship IDs."""
        reset_restore_registry_for_testing()
        from app.core.restore_registry import register_default_entities

        register_default_entities()
        reg = get_restore_registry()
        config = reg.get("contact")

        assert config is not None
        excluded = config.all_excluded_fields
        assert "search_tsv" in excluded
        assert "embedding" in excluded
        assert "default_person_id" in excluded
        assert "admin_contactperson_id" in excluded

    def test_dms_file_excludes_storage_path(self):
        """DMS File should exclude storage_path, content_hash, size_bytes.

        Plugin entities are registered by their plugins in on_activate(),
        not by register_default_entities() (P0-7 fix).
        """
        reset_restore_registry_for_testing()
        from app.core.restore_registry import RestoreConfig, get_restore_registry
        from app.plugins.builtins.dms.models import File as DmsFile

        reg = get_restore_registry()
        reg.register(RestoreConfig(
            entity_type="dms_file",
            model_class=DmsFile,
            restore_permission="dms:write",
            excluded_fields=frozenset({
                "storage_path", "content_hash", "size_bytes", "uploaded_by", "folder_id",
            }),
        ))
        config = reg.get("dms_file")

        assert config is not None
        excluded = config.all_excluded_fields
        assert "storage_path" in excluded
        assert "content_hash" in excluded
        assert "size_bytes" in excluded
        assert "uploaded_by" in excluded

    def test_mail_excludes_message_id_and_raw_path(self):
        """Mail should exclude message_id, rfc822_size, raw_path.

        Plugin entities are registered by their plugins in on_activate(),
        not by register_default_entities() (P0-7 fix).
        """
        reset_restore_registry_for_testing()
        from app.core.restore_registry import RestoreConfig, get_restore_registry
        from app.plugins.builtins.mail.plugin import _mail_restore_handler
        from app.plugins.builtins.mail.models import Mail

        reg = get_restore_registry()
        reg.register(RestoreConfig(
            entity_type="mail",
            model_class=Mail,
            restore_permission="mail:write",
            excluded_fields=frozenset({
                "message_id", "rfc822_size", "raw_path", "account_id", "folder_id",
            }),
            special_handler=_mail_restore_handler,
        ))
        config = reg.get("mail")

        assert config is not None
        excluded = config.all_excluded_fields
        assert "message_id" in excluded
        assert "rfc822_size" in excluded
        assert "raw_path" in excluded
        assert config.special_handler is not None

    def test_all_default_entities_registered(self):
        """register_default_entities should register only Core entity types.

        Plugin entities (task, calendar_entry, dms_file, mail) are registered
        by their respective plugins in on_activate() (P0-7 fix).
        """
        reset_restore_registry_for_testing()
        from app.core.restore_registry import register_default_entities

        register_default_entities()
        reg = get_restore_registry()
        registered = reg.list_registered()

        # Only Core entity (contact) is registered by register_default_entities()
        assert "contact" in registered
        # Plugin entities are registered by their plugins in on_activate()
        assert len(registered) == 1