"""Tests for SyncPushPullTask initialization and configuration."""

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

import pytest

from handler.database import db_device_handler, db_save_handler
from handler.sync.ssh_handler import RemoteSaveInfo
from models.assets import Save
from models.device import Device, SyncMode
from models.platform import Platform
from models.rom import Rom
from models.user import User
from tasks.sync_push_pull_task import (
    SyncPushPullTask,
    _process_remote_save,
    _push_missing_saves,
    sync_push_pull_task,
)
from tasks.tasks import PeriodicTask, TaskType


class TestSyncPushPullTaskInit:
    @pytest.fixture
    def task(self):
        return SyncPushPullTask()

    def test_init(self, task: SyncPushPullTask):
        assert task.title == "Push-Pull Sync"
        assert task.description == "Sync saves with devices via SSH/SFTP"
        assert task.task_type == TaskType.SYNC
        assert task.func == "tasks.sync_push_pull_task.run_push_pull_sync"

    def test_is_periodic_task(self, task: SyncPushPullTask):
        assert isinstance(task, PeriodicTask)

    def test_module_singleton_exists(self):
        assert sync_push_pull_task is not None
        assert isinstance(sync_push_pull_task, SyncPushPullTask)

    def test_cron_string_set(self, task: SyncPushPullTask):
        assert task.cron_string is not None


class TestRunPushPullSync:
    @patch("tasks.sync_push_pull_task.ENABLE_SYNC_PUSH_PULL", False)
    async def test_run_disabled_returns_disabled(self):
        from tasks.sync_push_pull_task import run_push_pull_sync

        result = await run_push_pull_sync()
        assert result["status"] == "disabled"

    @patch("tasks.sync_push_pull_task.ENABLE_SYNC_PUSH_PULL", True)
    @patch("tasks.sync_push_pull_task.db_device_handler")
    async def test_run_no_devices(self, mock_device_handler):
        from tasks.sync_push_pull_task import run_push_pull_sync

        mock_device_handler.get_all_devices_by_sync_mode.return_value = []

        result = await run_push_pull_sync()
        assert result["status"] == "no_devices"

    @patch("tasks.sync_push_pull_task.ENABLE_SYNC_PUSH_PULL", True)
    @patch("tasks.sync_push_pull_task.db_device_handler")
    async def test_run_device_not_found(self, mock_device_handler):
        from tasks.sync_push_pull_task import run_push_pull_sync

        mock_device_handler.get_device_by_id.return_value = None

        result = await run_push_pull_sync(device_id="nonexistent")
        assert result["status"] == "error"
        assert "not found" in result["message"]

    @patch("tasks.sync_push_pull_task.ENABLE_SYNC_PUSH_PULL", False)
    async def test_run_force_override(self):
        from tasks.sync_push_pull_task import run_push_pull_sync

        with patch("tasks.sync_push_pull_task.db_device_handler") as mock_handler:
            mock_handler.get_device_by_id.return_value = None
            result = await run_push_pull_sync(device_id="test", force=True)
            assert result["status"] == "error"  # Device not found, but didn't skip


class TestNullSlotLeakInProcessRemoteSave:
    """Bug R1a: `_process_remote_save` selects the first save with matching
    filename, including null-slot archival saves. This mirrors the negotiate
    Invariant 2 leak — archival saves must never participate in device sync.
    """

    @pytest.fixture
    def device(self, admin_user: User) -> Device:
        return db_device_handler.add_device(
            Device(
                id="pp-dev-1",
                user_id=admin_user.id,
                sync_mode=SyncMode.PUSH_PULL,
                sync_enabled=True,
                sync_config={"ssh_host": "1.2.3.4"},
            )
        )

    async def test_remote_filename_does_not_match_null_slot_archival(
        self,
        device: Device,
        admin_user: User,
        rom: Rom,
        platform: Platform,
        archival_save: Save,
    ):
        """Only an archival (null-slot) save exists with the colliding name.
        A remote file with that filename must NOT be paired with the archival
        row. The function should treat this as 'no matching server save' and
        return 'skipped' (it certainly must not write to the archival save).
        """
        remote_save = RemoteSaveInfo(
            path=f"/remote/{platform.fs_slug}/{archival_save.file_name}",
            file_name=archival_save.file_name,
            platform_slug=platform.fs_slug,
            file_size=999,
            mtime=datetime.now(timezone.utc),
        )

        ssh = MagicMock()
        ssh.download_save = AsyncMock(
            return_value=("/tmp/should_not_be_called", "deadbeef")
        )
        ssh.upload_save = AsyncMock()

        with patch("tasks.sync_push_pull_task.get_ssh_sync_handler", return_value=ssh):
            action = await _process_remote_save(
                device, conn=MagicMock(), remote_save=remote_save
            )

        # Archival rows must not be selected as a sync target.
        assert action == "skipped"
        # The archival row's bytes must be untouched.
        refreshed = db_save_handler.get_save(user_id=admin_user.id, id=archival_save.id)
        assert refreshed is not None
        assert refreshed.content_hash == archival_save.content_hash
        assert refreshed.file_size_bytes == archival_save.file_size_bytes
        # And nothing should have been downloaded from the device for this row.
        ssh.download_save.assert_not_called()

    async def test_remote_filename_matches_slotted_save_when_archival_collides(
        self,
        device: Device,
        admin_user: User,
        rom: Rom,
        platform: Platform,
        save: Save,
    ):
        """When both an archival and a slotted save share the filename, the
        function must pick the slotted save, not the archival row that appears
        first in the unfiltered query result.
        """
        # Create an additional archival (null-slot) save with the same filename
        # as the slotted `save` fixture (test_save.sav). Insert it FIRST so the
        # unfiltered iteration order favours it under the current bug.
        archival = db_save_handler.add_save(
            Save(
                rom_id=rom.id,
                user_id=admin_user.id,
                file_name=save.file_name,
                file_name_no_tags=save.file_name_no_tags,
                file_name_no_ext=save.file_name_no_ext,
                file_extension=save.file_extension,
                emulator=save.emulator,
                slot=None,
                file_path=save.file_path,
                file_size_bytes=42,
                content_hash="archival_hash_unique",
            )
        )

        remote_save = RemoteSaveInfo(
            path=f"/remote/{platform.fs_slug}/{save.file_name}",
            file_name=save.file_name,
            platform_slug=platform.fs_slug,
            file_size=1,
            mtime=datetime.now(timezone.utc),
        )

        ssh = MagicMock()
        ssh.download_save = AsyncMock(
            return_value=("/tmp/should_not_matter", save.content_hash or "x")
        )
        ssh.upload_save = AsyncMock()

        with patch(
            "tasks.sync_push_pull_task.get_ssh_sync_handler", return_value=ssh
        ), patch("tasks.sync_push_pull_task.fs_asset_handler"), patch(
            "tasks.sync_push_pull_task.compare_save_state"
        ) as mock_cmp, patch(
            "tasks.sync_push_pull_task.AnyioPath"
        ) as mock_anyio_path:
            mock_cmp.return_value = MagicMock(action="no_op", reason=None)
            mock_anyio_path.return_value.exists = AsyncMock(return_value=False)
            await _process_remote_save(
                device, conn=MagicMock(), remote_save=remote_save
            )

            # compare_save_state should have been called with the SLOTTED save's
            # hash, not the archival one. The bug picks the archival because it
            # appears first in the unfiltered iteration.
            kwargs = mock_cmp.call_args.kwargs
            assert (
                kwargs["server_hash"] != "archival_hash_unique"
            ), "archival null-slot save leaked into push-pull match path"

        # Archival row must remain untouched regardless.
        refreshed = db_save_handler.get_save(user_id=admin_user.id, id=archival.id)
        assert refreshed is not None
        assert refreshed.content_hash == "archival_hash_unique"


class TestNullSlotLeakInPushMissingSaves:
    """Bug R1b: `_push_missing_saves` iterates every Save for the platform,
    including null-slot archival rows, and uploads them to the device.
    """

    @pytest.fixture
    def device(self, admin_user: User) -> Device:
        return db_device_handler.add_device(
            Device(
                id="pp-dev-2",
                user_id=admin_user.id,
                sync_mode=SyncMode.PUSH_PULL,
                sync_enabled=True,
                sync_config={"ssh_host": "1.2.3.4"},
            )
        )

    async def test_archival_save_is_not_pushed_to_device(
        self,
        device: Device,
        admin_user: User,
        platform: Platform,
        save: Save,
        archival_save: Save,
    ):
        """Only the slotted save should be uploaded. The null-slot archival
        save must never be pushed to a device under push-pull sync.
        """
        ssh = MagicMock()
        ssh.upload_save = AsyncMock()

        save_directories = [
            {"platform_slug": platform.fs_slug, "path": "/remote/saves"}
        ]
        # Empty remote_saves means every server save would be considered "missing".
        with patch(
            "tasks.sync_push_pull_task.get_ssh_sync_handler", return_value=ssh
        ), patch("tasks.sync_push_pull_task.fs_asset_handler") as mock_assets:
            mock_assets.validate_path.side_effect = lambda p: f"/server/{p}"
            pushed = await _push_missing_saves(
                device,
                conn=MagicMock(),
                remote_saves=[],
                save_directories=save_directories,
            )

        uploaded_local_paths = [call.args[1] for call in ssh.upload_save.call_args_list]
        # The archival file_name MUST NOT appear in any uploaded path.
        assert not any(
            archival_save.file_name in p for p in uploaded_local_paths
        ), f"archival save {archival_save.file_name} leaked into device push: {uploaded_local_paths}"
        # The slotted save SHOULD have been pushed.
        assert any(
            save.file_name in p for p in uploaded_local_paths
        ), f"slotted save was not pushed: {uploaded_local_paths}"
        # And the upload count should reflect slotted-only.
        assert pushed == 1