# logbus/publisher.py

import logging

logger = logging.getLogger("logbus")


def log(message: str):
    """
    Dumb logger:
    - skip lege messages
    - stuur message 1:1 door
    - geen prefixes
    - geen mutaties
    """

    if not message or not message.strip():
        return

    # console
    logger.warning(message)

    # UI-echo
    try:
        from scraper.ui_log import push_ui

        push_ui(message)
    except Exception:
        pass


# ============================================================
# Delta-based log retrieval using Redis indexes
# ============================================================


def get_ui_logs_delta(last_index: int):
    """
    Returns (new_lines, total_count)
    Only returns log lines AFTER last_index.

    Example:
        last_index = 10 → returns logs with Redis indexes 11..end
    """
    # Determine total lines in buffer
    total = r.llen(UI_LOG_KEY)

    if total == 0:
        return [], 0

    # First load OR index invalid → send entire buffer
    if last_index < 0 or last_index >= total:
        logs = r.lrange(UI_LOG_KEY, 0, -1)
        return logs, total

    # Only new lines:
    new_lines = r.lrange(UI_LOG_KEY, last_index + 1, -1)
    return new_lines, total