# ============================================================
# File: scraper/tasks/controller_tasks.py
# Purpose:
#   Start the download → parse → save pipeline for a scraped book,
#   including progress/abort tracking via book_id.
#   ONLY THE CONTROLLER UPDATES PROGRESS (initial total).
# ============================================================

from celery_app import celery_app
from logbus.publisher import log

from scraper.download_controller import DownloadController
from scraper.progress import (
    set_total,
)
from scraper.abort import abort_requested

print(">>> [IMPORT] controller_tasks.py loaded")


@celery_app.task(bind=True, queue="controller", ignore_result=False)
def launch_downloads(self, book_id: str, scrape_result: dict):
    """
    Launch the entire pipeline (download → parse → save),
    AND initialize progress counters.

    Chapter-level progress is updated INSIDE the download/parse/save tasks.
    This task MUST NOT call .get() on async subtasks (Celery restriction).
    """

    title = scrape_result.get("title", "UnknownBook")
    chapters = scrape_result.get("chapters", []) or []
    total = len(chapters)

    log(f"[CTRL] Book '{title}' → {total} chapters (book_id={book_id})")

    # ------------------------------------------------------------
    # INIT PROGRESS
    # ------------------------------------------------------------
    set_total(book_id, total)
    log(f"[CTRL] Progress initialized for {book_id}: total={total}")

    # ------------------------------------------------------------
    # BUILD CONTROLLER
    # ------------------------------------------------------------
    ctl = DownloadController(book_id, scrape_result)

    # ------------------------------------------------------------
    # START PIPELINES (ASYNC)
    # Returns a celery group AsyncResult. We DO NOT iterate or get().
    # Progress & failures are handled by the worker subtasks.
    # ------------------------------------------------------------
    try:
        group_result = ctl.start()

        log(
            f"[CTRL] Pipelines dispatched for '{title}' "
            f"(book_id={book_id}, group_id={group_result.id})"
        )

        # Abort flag set BEFORE tasks start?
        if abort_requested(book_id):
            log(f"[CTRL] ABORT requested before tasks start")
            return {"book_id": book_id, "aborted": True}

    except Exception as exc:
        log(f"[CTRL] ERROR while dispatching pipelines: {exc}")
        raise

    # ------------------------------------------------------------
    # CONTROLLER DOES NOT WAIT FOR SUBTASK RESULTS
    # (Download/parse/save tasks update progress themselves)
    # ------------------------------------------------------------
    log(f"[CTRL] Controller finished dispatch for book_id={book_id}")

    return {
        "book_id": book_id,
        "total": total,
        "started": True,
        "group_id": group_result.id,
    }