from unittest.mock import MagicMock

import pytest

from src.ses_client import SESClient


@pytest.fixture
def ses_client():
    client = SESClient(region="us-east-1")
    client.client = MagicMock()
    client.client.send_email.return_value = {"MessageId": "msg-001"}
    return client


class TestSESClientSendEmail:
    def test_source_arn_added_to_kwargs_when_provided(self, ses_client):
        """SourceArn must be present in the boto3 call when source_arn is given."""
        ses_client.send_email(
            to_addresses=["alice@example.com"],
            subject="Test",
            body_text="Hello",
            from_address="sender@example.com",
            source_arn="arn:aws:ses:us-east-1:123456789012:identity/sender@example.com",
        )

        call_kwargs = ses_client.client.send_email.call_args.kwargs
        assert call_kwargs["SourceArn"] == "arn:aws:ses:us-east-1:123456789012:identity/sender@example.com"

    def test_source_arn_absent_from_kwargs_when_none(self, ses_client):
        """SourceArn must not appear in the boto3 call when source_arn is None."""
        ses_client.send_email(
            to_addresses=["alice@example.com"],
            subject="Test",
            body_text="Hello",
            from_address="sender@example.com",
            source_arn=None,
        )

        call_kwargs = ses_client.client.send_email.call_args.kwargs
        assert "SourceArn" not in call_kwargs

    def test_source_arn_absent_from_kwargs_when_omitted(self, ses_client):
        """SourceArn must not appear in the boto3 call when source_arn is not passed at all."""
        ses_client.send_email(
            to_addresses=["alice@example.com"],
            subject="Test",
            body_text="Hello",
            from_address="sender@example.com",
        )

        call_kwargs = ses_client.client.send_email.call_args.kwargs
        assert "SourceArn" not in call_kwargs

    def test_recipients_sent_as_bcc(self, ses_client):
        """Addresses must go into BccAddresses, not ToAddresses, to avoid exposing recipients."""
        ses_client.send_email(
            to_addresses=["alice@example.com", "bob@example.com"],
            subject="Test",
            body_text="Hello",
            from_address="sender@example.com",
        )

        call_kwargs = ses_client.client.send_email.call_args.kwargs
        assert call_kwargs["Destination"] == {"BccAddresses": ["alice@example.com", "bob@example.com"]}

    def test_returns_message_id(self, ses_client):
        result = ses_client.send_email(
            to_addresses=["alice@example.com"],
            subject="Test",
            body_text="Hello",
            from_address="sender@example.com",
        )
        assert result == "msg-001"