from app.services.reply_recipients import reply_recipients


def test_reply_prefers_reply_to_header():
    message = {
        "sender": {"name": "Sender", "address": "sender@example.com"},
        "reply_to": [{"name": "Support", "address": "support@example.com"}],
        "to": [{"name": "Me", "address": "me@gentic.email"}],
        "cc": [],
    }
    to, cc = reply_recipients(message=message, viewer_email="me@gentic.email", reply_all=False)
    assert to == ["support@example.com"]
    assert cc == []


def test_reply_all_excludes_viewer_and_deduplicates():
    message = {
        "sender": {"name": "Sender", "address": "sender@example.com"},
        "to": [
            {"name": "Me", "address": "me@gentic.email"},
            {"name": "Other", "address": "other@example.com"},
        ],
        "cc": [
            {"name": "Sender", "address": "sender@example.com"},
            {"name": "Third", "address": "third@example.com"},
        ],
    }
    to, cc = reply_recipients(message=message, viewer_email="me@gentic.email", reply_all=True)
    assert to == ["sender@example.com"]
    assert set(cc) == {"other@example.com", "third@example.com"}