"""Unit tests for the FIX-M21 stale-IMEI recovery helpers.

Covers:
  - ts_shared_rev.get_stale_imeis — the SQL selector
  - ingest_movement_rev.poll_stale_locations — the scheduler wrapper
"""
import sys
import os
import pytest
from unittest.mock import MagicMock, patch
from contextlib import contextmanager

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.dirname(__file__))))

os.environ.setdefault("TRACKSOLID_APP_KEY", "test_key")
os.environ.setdefault("TRACKSOLID_APP_SECRET", "test_secret")
os.environ.setdefault("TRACKSOLID_USER_ID", "test_user")
os.environ.setdefault("TRACKSOLID_PWD_MD5", "test_md5")
os.environ.setdefault("DATABASE_URL", "postgresql://test:test@localhost:5432/test")


def _make_mock_conn(rows=None):
    """Cursor/connection double that returns `rows` from fetchall()."""
    mock_cur = MagicMock()
    mock_cur.fetchall.return_value = rows or []
    mock_conn = MagicMock()
    mock_conn.cursor.return_value.__enter__ = lambda s: mock_cur
    mock_conn.cursor.return_value.__exit__ = MagicMock(return_value=False)
    return mock_conn, mock_cur


@contextmanager
def _conn_ctx(mock_conn):
    yield mock_conn


class TestGetStaleImeis:
    def test_returns_devices_with_old_gps_time(self):
        from ts_shared_rev import get_stale_imeis
        mock_conn, mock_cur = _make_mock_conn(rows=[("imei_a",), ("imei_b",)])
        with patch("ts_shared_rev.get_conn") as mock_get_conn:
            mock_get_conn.return_value = _conn_ctx(mock_conn)
            result = get_stale_imeis(stale_minutes=30)

        assert result == ["imei_a", "imei_b"]
        sql = str(mock_cur.execute.call_args)
        assert "enabled_flag = 1" in sql
        assert "INTERVAL" in sql.upper() or "interval" in sql
        assert "NULLS FIRST" in sql

    def test_returns_empty_when_no_stale(self):
        from ts_shared_rev import get_stale_imeis
        mock_conn, _ = _make_mock_conn(rows=[])
        with patch("ts_shared_rev.get_conn") as mock_get_conn:
            mock_get_conn.return_value = _conn_ctx(mock_conn)
            assert get_stale_imeis() == []


class TestPollStaleLocations:
    def test_noop_when_empty(self):
        """If no IMEIs are stale, get_device_locations must NOT be called."""
        import ingest_movement_rev as mod
        with patch.object(mod, "get_stale_imeis", return_value=[]), \
             patch.object(mod, "get_device_locations") as mock_refresh:
            mod.poll_stale_locations()
            mock_refresh.assert_not_called()

    def test_invokes_refresh_with_stale_list(self):
        """When stale IMEIs are present, get_device_locations is called once
        with the exact list returned by get_stale_imeis."""
        import ingest_movement_rev as mod
        stale = ["imei_a", "imei_b", "imei_c"]
        with patch.object(mod, "get_stale_imeis", return_value=stale), \
             patch.object(mod, "get_device_locations") as mock_refresh:
            mod.poll_stale_locations()
            mock_refresh.assert_called_once_with(stale)


class TestUpsertLivePositionGuards:
    """Spot-checks on the time-guard contract — covers what the dashboard
    relies on (no rewinding the marker on stale alarm arrivals)."""

    def test_skips_invalid_fix(self):
        from ts_shared_rev import upsert_live_position
        mock_cur = MagicMock()
        # Zero-Island
        assert upsert_live_position(mock_cur, "imei_x", 0, 0, "2026-05-21 10:00:00") == 0
        mock_cur.execute.assert_not_called()

    def test_skips_missing_gps_time(self):
        from ts_shared_rev import upsert_live_position
        mock_cur = MagicMock()
        assert upsert_live_position(mock_cur, "imei_x", -1.29, 36.82, None) == 0
        mock_cur.execute.assert_not_called()

    def test_skips_missing_imei(self):
        from ts_shared_rev import upsert_live_position
        mock_cur = MagicMock()
        assert upsert_live_position(mock_cur, None, -1.29, 36.82, "2026-05-21 10:00:00") == 0
        mock_cur.execute.assert_not_called()

    def test_executes_upsert_for_valid_fix(self):
        from ts_shared_rev import upsert_live_position
        mock_cur = MagicMock()
        mock_cur.rowcount = 1
        n = upsert_live_position(mock_cur, "imei_x", -1.29, 36.82, "2026-05-21 10:00:00",
                                 speed=42.5)
        assert n == 1
        mock_cur.execute.assert_called_once()
        sql = str(mock_cur.execute.call_args)
        # The time-guard is the load-bearing detail — verify it's present.
        assert "EXCLUDED.gps_time > tracksolid.live_positions.gps_time" in sql