from datetime import datetime, timezone
from chorus_bot import ping


def test_build_and_parse_round_trip():
    captured_at = datetime(2026, 7, 13, 7, 0, 0, tzinfo=timezone.utc)
    embed = ping.build_ping_embed(
        modality="bh_email",
        sender_id="jane@example.com",
        snippet="I have some books to donate...",
        raw_content="I have some books to donate. Full text goes here.",
        captured_at=captured_at,
    )
    assert "bh_email" in embed.title or "bh_email" in str(embed.fields)
    assert "I have some books to donate..." in (embed.description or "")

    parsed = ping.parse_ping_embed(embed)
    assert parsed["modality"] == "bh_email"
    assert parsed["sender_id"] == "jane@example.com"
    assert parsed["raw_content"] == "I have some books to donate. Full text goes here."
    assert parsed["captured_at"] == captured_at


def test_build_ping_embed_handles_missing_sender():
    embed = ping.build_ping_embed(
        modality="voice",
        sender_id=None,
        snippet="call about donation",
        raw_content="call about donation",
        captured_at=datetime(2026, 7, 13, 8, 0, 0, tzinfo=timezone.utc),
    )
    parsed = ping.parse_ping_embed(embed)
    assert parsed["sender_id"] is None


def test_build_and_parse_empty_raw_content():
    """Verify empty raw_content round-trips correctly without being converted to '(empty)'."""
    captured_at = datetime(2026, 7, 13, 9, 0, 0, tzinfo=timezone.utc)
    embed = ping.build_ping_embed(
        modality="bh_email",
        sender_id="test@example.com",
        snippet="Empty message",
        raw_content="",
        captured_at=captured_at,
    )
    parsed = ping.parse_ping_embed(embed)
    assert parsed["raw_content"] == "", "Empty raw_content should round-trip as empty string, not '(empty)'"


def test_build_ping_embed_never_produces_empty_field_value_for_empty_raw_content():
    """Regression guard for C1: Discord's API rejects embed field values with
    length 0 (HTTP 400). Every field value must have len() >= 1 after
    build_ping_embed runs, even when raw_content is ''."""
    embed = ping.build_ping_embed(
        modality="bh_email",
        sender_id="test@example.com",
        snippet="Empty message",
        raw_content="",
        captured_at=datetime(2026, 7, 13, 9, 0, 0, tzinfo=timezone.utc),
    )
    for field in embed.fields:
        assert len(field.value) >= 1, f"field {field.name!r} has an empty value"


def test_build_ping_embed_never_produces_empty_field_value_for_sender_id_none():
    """Regression guard for C1: manual_share.py always calls build_ping_embed
    with sender_id=None. Every field value must still have len() >= 1."""
    embed = ping.build_ping_embed(
        modality="voice",
        sender_id=None,
        snippet="call about donation",
        raw_content="call about donation",
        captured_at=datetime(2026, 7, 13, 8, 0, 0, tzinfo=timezone.utc),
    )
    for field in embed.fields:
        assert len(field.value) >= 1, f"field {field.name!r} has an empty value"


def test_build_ping_embed_truncates_long_raw_content():
    """Regression guard for C2: embed field values over 1024 chars are
    rejected by Discord. build_ping_embed must truncate defensively."""
    long_body = "x" * 2000
    embed = ping.build_ping_embed(
        modality="bh_email",
        sender_id="jane@example.com",
        snippet="long email",
        raw_content=long_body,
        captured_at=datetime(2026, 7, 13, 9, 0, 0, tzinfo=timezone.utc),
    )
    raw_content_field = next(f for f in embed.fields if f.name == "raw_content")
    assert len(raw_content_field.value) <= 1024
    assert "truncated" in raw_content_field.value