# ============================================================
# File: scraper/tasks/save_tasks.py
# Purpose: Save parsed chapter text to disk + trigger audio.
# Updated for chapter_dict + book_meta pipeline model.
# ============================================================

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

from celery import shared_task
import os
from scraper.utils import get_save_path
from scraper.tasks.download_tasks import log_msg  # unified logger
from scraper.progress import (
    inc_completed,
    inc_chapter_done,
    inc_chapter_download_skipped,
)
from scraper.tasks.audio_tasks import generate_audio


@shared_task(bind=True, queue="save", ignore_result=False)
def save_chapter(self, parsed: dict):
    """
    New pipeline model:
    parsed = {
        "book_id": str,
        "chapter": chapter_dict,
        "text": str,
        "length": int,
        "book_meta": dict,
        "skipped": bool,
        "path": optional str (if skipped)
    }
    """

    book_id = parsed.get("book_id", "NOBOOK")
    chapter_dict = parsed.get("chapter") or {}
    book_meta = parsed.get("book_meta") or {}

    chapter_num = chapter_dict.get("num")
    chapter_title = chapter_dict.get("title") or f"Chapter {chapter_num}"
    volume_path = chapter_dict.get("volume_path")

    # ------------------------------------------------------------
    # VALIDATION
    # ------------------------------------------------------------
    if chapter_num is None or volume_path is None:
        raise ValueError("Invalid parsed payload: chapter_dict missing fields.")

    # ------------------------------------------------------------
    # SKIPPED CASE
    # ------------------------------------------------------------
    if parsed.get("skipped"):
        path = parsed.get("path", None)
        log_msg(book_id, f"[SAVE] SKIP chapter {chapter_num} → {path}")

        inc_chapter_download_skipped(book_id)

        volume_name = os.path.basename(volume_path.rstrip("/"))

        # Queue audio only if a valid file exists
        if path and os.path.exists(path):
            try:
                generate_audio.delay(
                    book_id,
                    volume_name,
                    chapter_num,
                    chapter_title,
                    path,
                )
                log_msg(
                    book_id,
                    f"[AUDIO] Task queued (SKIPPED) for chapter {chapter_num} in {volume_name}",
                )
            except Exception as audio_exc:
                log_msg(
                    book_id,
                    f"[AUDIO] ERROR queueing (SKIPPED) chapter {chapter_num}: {audio_exc}",
                )

        return {
            "book_id": book_id,
            "chapter": chapter_dict,
            "path": path,
            "skipped": True,
            "book_meta": book_meta,
        }

    # ------------------------------------------------------------
    # NORMAL SAVE CASE
    # ------------------------------------------------------------
    try:
        text = parsed.get("text", "")

        # Ensure volume folder exists
        os.makedirs(volume_path, exist_ok=True)

        # Build final chapter file path
        path = get_save_path(chapter_num, volume_path)

        # Write chapter text to file
        with open(path, "w", encoding="utf-8") as f:
            f.write(text)

        log_msg(book_id, f"[SAVE] Saved chapter {chapter_num} → {path}")
        inc_chapter_done(book_id)
        inc_completed(book_id)

        # Determine volume name
        volume_name = os.path.basename(volume_path.rstrip("/"))

        # Queue audio task
        try:
            generate_audio.delay(
                book_id,
                volume_name,
                chapter_num,
                chapter_title,
                path,
            )
            log_msg(
                book_id,
                f"[AUDIO] Task queued for chapter {chapter_num} in {volume_name}",
            )
        except Exception as audio_exc:
            log_msg(
                book_id, f"[AUDIO] ERROR queueing chapter {chapter_num}: {audio_exc}"
            )

        return {
            "book_id": book_id,
            "chapter": chapter_dict,
            "path": path,
            "book_meta": book_meta,
        }

    except Exception as exc:
        log_msg(book_id, f"[SAVE] ERROR saving chapter {chapter_num}: {exc}")
        raise