"""Unit tests for calendar email detection and ICS parsing."""

import pytest
from src.mail.utils import calendar_parser
from src.mail.notification_detector import is_calendar_email


class TestCalendarDetection:
    """Test calendar email detection."""

    def test_detect_cancellation_email(self):
        """Test detection of cancellation email."""
        envelope = {
            "from": {"addr": "organizer@example.com"},
            "subject": "Canceled: Technical Refinement",
            "date": "2025-12-19T12:42:00",
        }

        assert is_calendar_email(envelope) is True
        assert is_calendar_email(envelope) is True

    def test_detect_invite_email(self):
        """Test detection of invite email."""
        envelope = {
            "from": {"addr": "organizer@example.com"},
            "subject": "Technical Refinement Meeting",
            "date": "2025-12-19T12:42:00",
        }

        assert is_calendar_email(envelope) is True

    def test_non_calendar_email(self):
        """Test that non-calendar email is not detected."""
        envelope = {
            "from": {"addr": "user@example.com"},
            "subject": "Hello from a friend",
            "date": "2025-12-19T12:42:00",
        }

        assert is_calendar_email(envelope) is False


class TestICSParsing:
    """Test ICS file parsing."""

    def test_parse_cancellation_ics(self):
        """Test parsing of cancellation ICS from test fixture."""
        import base64
        from pathlib import Path

        fixture_path = Path(
            "tests/fixtures/test_mailbox/INBOX/cur/17051226-calendar-invite-001.test:2"
        )
        if not fixture_path.exists():
            pytest.skip("Test fixture file not found")
            return

        with open(fixture_path, "r") as f:
            content = f.read()

        event = parse_calendar_part(content)
        assert event is not None
        assert is_cancelled_event(event) is True
        assert event.method == "CANCEL"
        assert event.summary == "Technical Refinement Meeting"

    def test_parse_invite_ics(self):
        """Test parsing of invite ICS from test fixture."""
        import base64
        from pathlib import Path

        fixture_path = Path(
            "tests/fixtures/test_mailbox/INBOX/cur/17051226-calendar-invite-001.test:2"
        )
        if not fixture_path.exists():
            pytest.skip("Test fixture file not found")
            return

        with open(fixture_path, "r") as f:
            content = f.read()

        event = parse_calendar_part(content)
        assert event is not None
        assert is_event_request(event) is True
        assert event.method == "REQUEST"
        assert event.summary == "Technical Refinement Meeting"

    def test_invalid_ics(self):
        """Test parsing of invalid ICS content."""
        event = parse_calendar_part("invalid ics content")

        assert event is None  # Should return None for invalid ICS

    def test_base64_decoding(self):
        """Test base64 decoding of ICS attachment."""
        # Test that we can decode base64
        encoded = "BASE64ENCODED_I_TEST"
        import base64

        decoded = base64.b64decode(encoded)
        assert decoded == encoded