ToCode: post #6042 — TG.ME

            "- Only mark genuine downtime as a break — do not use it for slow "
            "or informal but still on-topic teaching."
        ),
    )


def analyze_chunk(
    agent: Agent, chunk: dict, chunk_index: int, total_chunks: int
) -> list[Lesson]:
    """
    Analyze one chunk → list of lessons with timestamps converted to
    original video time.
    """
    offset = chunk["offset_seconds"]
    video_file = upload_chunk(chunk["path"], chunk_index)

    print(f"   🤖 Analyzing chunk {chunk_index}/{total_chunks - 1} "
          f"(offset={seconds_to_ts(offset)})...")
    t0 = time.time()

    result = agent.run_sync(
        [
            (
                f"This is chunk {chunk_index} of a longer course video. "
                f"The chunk starts at {seconds_to_ts(offset)} in the original video. "
                f"Identify all complete 10-15 minute lessons within this chunk. "
                f"Timestamps must be relative to THIS CHUNK (00:00:00 = chunk start). "
                f"Do NOT include lessons that are cut off at chunk boundaries — "
                f"adjacent overlapping chunks will capture them."
            ),
            video_file,
        ]
    )

    elapsed = time.time() - t0
    chunk_lessons = result.output.lessons
    print(f"      ✅ {len(chunk_lessons)} lessons found in {elapsed:.0f}s")

    # Convert chunk-relative timestamps to original video timestamps
    converted = []
    for lesson in chunk_lessons:
        rel_start = ts_to_seconds(lesson.start_timestamp)
        rel_end = ts_to_seconds(lesson.end_timestamp)
        abs_start = rel_start + offset
        abs_end = rel_end + offset
        converted.append(Lesson(
            index=0,  # will be re-indexed later
            start_timestamp=seconds_to_ts(abs_start),
            end_timestamp=seconds_to_ts(abs_end),
            is_break=lesson.is_break,
            # Force the canonical slug for breaks in code, rather than
            # trusting the model to use the right literal string.
            slug="breaktime" if lesson.is_break else lesson.slug,
            title=lesson.title,
            summary_markdown_hebrew=lesson.summary_markdown_hebrew,
        ))

    return converted