"""Unit tests for email header parsing from message content.

Run with:
    pytest tests/test_header_parsing.py -v
"""

import pytest
import sys
from pathlib import Path

# Add project root to path for proper imports
project_root = str(Path(__file__).parent.parent)
if project_root not in sys.path:
    sys.path.insert(0, project_root)


# Sample cancelled meeting email from himalaya (message 114)
CANCELLED_MEETING_EMAIL = """From: Marshall <unknown>, Cody <john.marshall@corteva.com>
To: Ruttencutter <unknown>, Chris <chris.ruttencutter@corteva.com>, Dake <unknown>, Ryan <ryan.dake@corteva.com>, Smith <unknown>, James <james.l.smith@corteva.com>, Santana <unknown>, Jonatas <jonatas.santana@corteva.com>
Cc: Bendt <unknown>, Timothy <timothy.bendt@corteva.com>
Subject: Canceled: Technical Refinement

Received: from CY8PR17MB7060.namprd17.prod.outlook.com (2603:10b6:930:6d::6)
 by PH7PR17MB7149.namprd17.prod.outlook.com with HTTPS; Fri, 19 Dec 2025
 19:12:45 +0000
Received: from SA6PR17MB7362.namprd17.prod.outlook.com (2603:10b6:806:411::6)
 by CY8PR17MB7060.namprd17.prod.outlook.com (2603:10b6:930:6d::6) with
 Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9434.8; Fri, 19 Dec
 2025 19:12:42 +0000
From: "Marshall, Cody" <john.marshall@corteva.com>
To: "Ruttencutter, Chris" <chris.ruttencutter@corteva.com>, "Dake, Ryan"
	<ryan.dake@corteva.com>, "Smith, James" <james.l.smith@corteva.com>,
	"Santana, Jonatas" <jonatas.santana@corteva.com>
CC: "Bendt, Timothy" <timothy.bendt@corteva.com>
Subject: Canceled: Technical Refinement
Thread-Topic: Technical Refinement
Thread-Index: AdoSeicQGeYQHp7iHUWAUBWrOGskKw==
Importance: high
X-Priority: 1
Date: Fri, 19 Dec 2025 19:12:42 +0000
Message-ID:
	<SA6PR17MB7362D5E1A906728B63A804D2E4A9ASA6PR17MB7362.namprd17.prod.outlook.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Exchange-Organization-AuthAs: Internal
X-MS-Exchange-Organization-AuthMechanism: 04
Content-Type: multipart/alternative;
	boundary="_002_SA6PR17MB7362D5E1A906728B63A804D2E4A9ASA6PR17MB7362namp_"
MIME-Version: 1.0

--_002_SA6PR17MB7362D5E1A906728B63A804D2E4A9ASA6PR17MB7362namp_
Content-Type: text/plain; charset="us-ascii"


--_002_SA6PR17MB7362D5E1A906728B63A804D2E4A9ASA6PR17MB7362namp_
Content-Type: text/calendar; charset="utf-8"; method=CANCEL
Content-Transfer-Encoding: base64

QkVHSU46VkNBTEVOREFSDQpNRVRIT0Q6Q0FOQ0VMDQpQUk9ESUQ6TWljcm9zb2Z0IEV4Y2hhbmdl
IFNlcnZlciAyMDEwDQpWRVJTSU9OOjIuMA0KQkVHSU46VlRJTUVaT05FDQpUWklEOkNlbnRyYWwg
U3RhbmRhcmQgVGltZQ0KQkVHSU46U1RBTkRBUkQNCkRUU1RBUlQ6MTYwMTAxMDFUMDIwMDAwDQpU

--_002_SA6PR17MB7362D5E1A906728B63A804D2E4A9ASA6PR17MB7362namp_--
"""


class TestParseHeadersFromContent:
    """Tests for _parse_headers_from_content method."""

    @pytest.fixture
    def parser(self):
        """Create a ContentContainer instance for testing."""
        # We need to create a minimal instance just for the parsing method
        # Import here to avoid circular imports
        from src.mail.widgets.ContentContainer import ContentContainer

        container = ContentContainer()
        return container._parse_headers_from_content

    def test_parse_simple_headers(self, parser):
        """Test parsing simple email headers."""
        content = """From: John Doe <john@example.com>
To: Jane Smith <jane@example.com>
Subject: Test Email
Date: Mon, 29 Dec 2025 10:00:00 +0000

This is the body of the email.
"""
        headers = parser(content)

        assert headers["from"] == "John Doe <john@example.com>"
        assert headers["to"] == "Jane Smith <jane@example.com>"
        assert headers["subject"] == "Test Email"
        assert headers["date"] == "Mon, 29 Dec 2025 10:00:00 +0000"

    def test_parse_multiple_recipients(self, parser):
        """Test parsing headers with multiple recipients."""
        content = """From: sender@example.com
To: user1@example.com, user2@example.com, user3@example.com
Subject: Multi-recipient email
Date: 2025-12-29

Body here.
"""
        headers = parser(content)

        assert (
            headers["to"] == "user1@example.com, user2@example.com, user3@example.com"
        )

    def test_parse_with_cc(self, parser):
        """Test parsing headers including CC."""
        content = """From: sender@example.com
To: recipient@example.com
CC: cc1@example.com, cc2@example.com
Subject: Email with CC
Date: 2025-12-29

Body.
"""
        headers = parser(content)

        assert headers["to"] == "recipient@example.com"
        assert headers["cc"] == "cc1@example.com, cc2@example.com"

    def test_parse_multiline_to_header(self, parser):
        """Test parsing To header that spans multiple lines."""
        content = """From: sender@example.com
To: First User <first@example.com>,
 Second User <second@example.com>,
 Third User <third@example.com>
Subject: Multi-line To
Date: 2025-12-29

Body.
"""
        headers = parser(content)

        # Should combine continuation lines
        assert "First User" in headers["to"]
        assert "Second User" in headers["to"]
        assert "Third User" in headers["to"]

    def test_parse_with_name_and_email(self, parser):
        """Test parsing headers with display names and email addresses."""
        content = """From: Renovate Bot (SA @renovate-bot-sa) <gitlab@example.com>
To: Bendt <unknown>, Timothy <timothy.bendt@example.com>
Subject: Test Subject
Date: 2025-12-29 02:07+00:00

Body content.
"""
        headers = parser(content)

        assert (
            headers["from"] == "Renovate Bot (SA @renovate-bot-sa) <gitlab@example.com>"
        )
        assert "Timothy <timothy.bendt@example.com>" in headers["to"]
        assert "Bendt <unknown>" in headers["to"]

    def test_parse_empty_content(self, parser):
        """Test parsing empty content."""
        headers = parser("")
        assert headers == {}

    def test_parse_no_headers(self, parser):
        """Test parsing content with no recognizable headers."""
        content = """This is just body content
without any headers.
"""
        headers = parser(content)
        assert headers == {}

    def test_parse_ignores_unknown_headers(self, parser):
        """Test that unknown headers are ignored."""
        content = """From: sender@example.com
X-Custom-Header: some value
To: recipient@example.com
Message-ID: <123@example.com>
Subject: Test
Date: 2025-12-29

Body.
"""
        headers = parser(content)

        # Should only have the recognized headers
        assert set(headers.keys()) == {"from", "to", "subject", "date"}
        assert "X-Custom-Header" not in headers
        assert "Message-ID" not in headers

    def test_parse_real_himalaya_output(self, parser):
        """Test parsing actual himalaya message read output format."""
        content = """From: Renovate Bot (SA @renovate-bot-sa) <gitlab@gitlab.research.corteva.com>
To: Bendt <unknown>, Timothy <timothy.bendt@corteva.com>
Subject: Re: Fabric3 Monorepo | chore(deps): update vitest monorepo to v4 (major) (!6861)

Renovate Bot (SA) pushed new commits to merge request !6861<https://gitlab.research.corteva.com/granular/fabric/fabric3/-/merge_requests/6861>

  *   f96fec2b...2fb2ae10 <https://gitlab.research.corteva.com/granular/fabric/fabric3/-/compare/f96fec2b...2fb2ae10>  - 2 commits from branch `main`
"""
        headers = parser(content)

        assert (
            headers["from"]
            == "Renovate Bot (SA @renovate-bot-sa) <gitlab@gitlab.research.corteva.com>"
        )
        assert headers["to"] == "Bendt <unknown>, Timothy <timothy.bendt@corteva.com>"
        assert "Fabric3 Monorepo" in headers["subject"]

    def test_parse_cancelled_meeting_headers(self, parser):
        """Test parsing headers from a cancelled meeting email."""
        headers = parser(CANCELLED_MEETING_EMAIL)

        # Should extract the first occurrence of headers (simplified format)
        assert "Canceled: Technical Refinement" in headers.get("subject", "")
        assert "corteva.com" in headers.get("to", "")
        assert "cc" in headers  # Should have CC


class TestStripHeadersFromContent:
    """Tests for _strip_headers_from_content method."""

    @pytest.fixture
    def stripper(self):
        """Create a ContentContainer instance for testing."""
        from src.mail.widgets.ContentContainer import ContentContainer

        container = ContentContainer()
        return container._strip_headers_from_content

    def test_strip_simple_headers(self, stripper):
        """Test stripping simple headers from content."""
        content = """From: sender@example.com
To: recipient@example.com
Subject: Test

This is the body.
"""
        result = stripper(content)

        assert "From:" not in result
        assert "To:" not in result
        assert "Subject:" not in result
        assert "This is the body" in result

    def test_strip_mime_boundaries(self, stripper):
        """Test stripping MIME boundary markers."""
        content = """From: sender@example.com
Subject: Test

--boundary123456789
Content-Type: text/plain

Hello world

--boundary123456789--
"""
        result = stripper(content)

        assert "--boundary" not in result
        assert "Hello world" in result

    def test_strip_base64_content(self, stripper):
        """Test stripping base64 encoded content."""
        content = """From: sender@example.com
Subject: Test

--boundary
Content-Type: text/calendar
Content-Transfer-Encoding: base64

QkVHSU46VkNBTEVOREFSDQpNRVRIT0Q6Q0FOQ0VMDQpQUk9ESUQ6TWljcm9zb2Z0
IEV4Y2hhbmdlIFNlcnZlciAyMDEwDQpWRVJTSU9OOjIuMA0KQkVHSU46VlRJTUVa

--boundary--
"""
        result = stripper(content)

        # Should not contain base64 content
        assert "QkVHSU46" not in result
        assert "VKNTVU9OOjIuMA" not in result

    def test_strip_cancelled_meeting_email(self, stripper):
        """Test stripping a cancelled meeting email - should result in empty/minimal content."""
        result = stripper(CANCELLED_MEETING_EMAIL)

        # Should not contain headers
        assert "From:" not in result
        assert "To:" not in result
        assert "Subject:" not in result
        assert "Received:" not in result
        assert "Content-Type:" not in result

        # Should not contain MIME boundaries
        assert "--_002_" not in result

        # Should not contain base64
        assert "QkVHSU46" not in result

        # The result should be empty or just whitespace since the text/plain part is empty
        assert result.strip() == "" or len(result.strip()) < 50

    def test_strip_vcalendar_content(self, stripper):
        """Test stripping vCalendar/ICS content."""
        content = """From: sender@example.com
Subject: Meeting

BEGIN:VCALENDAR
METHOD:REQUEST
VERSION:2.0
BEGIN:VEVENT
SUMMARY:Team Meeting
END:VEVENT
END:VCALENDAR
"""
        result = stripper(content)

        assert "BEGIN:VCALENDAR" not in result
        assert "END:VCALENDAR" not in result
        assert "VEVENT" not in result


class TestFormatRecipients:
    """Tests for _format_recipients method."""

    @pytest.fixture
    def formatter(self):
        """Create a ContentContainer instance for testing."""
        from src.mail.widgets.ContentContainer import ContentContainer

        container = ContentContainer()
        return container._format_recipients

    def test_format_string_recipient(self, formatter):
        """Test formatting a string recipient."""
        result = formatter("user@example.com")
        assert result == "user@example.com"

    def test_format_dict_recipient(self, formatter):
        """Test formatting a dict recipient."""
        result = formatter({"name": "John Doe", "addr": "john@example.com"})
        assert result == "John Doe <john@example.com>"

    def test_format_dict_recipient_name_only(self, formatter):
        """Test formatting a dict with name only."""
        result = formatter({"name": "John Doe", "addr": ""})
        assert result == "John Doe"

    def test_format_dict_recipient_addr_only(self, formatter):
        """Test formatting a dict with addr only."""
        result = formatter({"name": None, "addr": "john@example.com"})
        assert result == "john@example.com"

    def test_format_dict_recipient_empty(self, formatter):
        """Test formatting an empty dict recipient."""
        result = formatter({"name": None, "addr": ""})
        assert result == ""

    def test_format_list_recipients(self, formatter):
        """Test formatting a list of recipients."""
        result = formatter(
            [
                {"name": "John", "addr": "john@example.com"},
                {"name": "Jane", "addr": "jane@example.com"},
            ]
        )
        assert result == "John <john@example.com>, Jane <jane@example.com>"

    def test_format_empty(self, formatter):
        """Test formatting empty input."""
        assert formatter(None) == ""
        assert formatter("") == ""
        assert formatter([]) == ""