# ============================================================
# File: scraper/services/status_check_service.py
# Purpose:
#   Handmatige, idempotente statuscheck per boek.
#
#   Bepaalt op basis van het filesystem:
#     - aantal gedownloade chapters (.txt)
#     - aantal gegenereerde audiofiles (.m4b)
#
#   En schrijft deze gevalideerde werkelijkheid naar SQL.
#
#   LET OP:
#   - Geen Redis
#   - Geen Celery
#   - Geen status-transities
#   - Geen pipeline-logica
# ============================================================

import os
from datetime import datetime
from typing import Dict, Any

from logbus.publisher import log
from scraper.logger_decorators import logcall

from db.state_sql import sql_fetch_book, sql_update_book


class StatusCheckService:
    """
    Statuscheck op basis van filesystem.
    Single source of truth = disk.
    """

    @staticmethod
    @logcall
    def run(book_idx: str) -> Dict[str, Any]:
        """
        Voer statuscheck uit voor één boek.

        Returns een inspecteerbaar dict met:
          - filesystem tellingen
          - SQL before / after snapshot
        """

        # ----------------------------------------------------
        # 1. SQL fetch (bestaat het boek?)
        # ----------------------------------------------------
        sql_before = sql_fetch_book(book_idx)

        if not sql_before:
            raise ValueError(f"[STATUSCHECK] Book not found in SQL: {book_idx}")

        # ----------------------------------------------------
        # 2. Bepaal filesystem root
        # ----------------------------------------------------
        output_root = os.getenv("BOOKSCRAPER_OUTPUT_DIR", "output")
        title = sql_before.get("title")
        book_dir = os.path.join(output_root, title)

        if not os.path.isdir(book_dir):
            log(
                f"[STATUSCHECK] No output directory for book_idx={book_idx} : title='{title}')"
            )
            chapters_txt = 0
            audio_files = 0
            volumes = 0
        else:
            chapters_txt = 0
            audio_files = 0
            volumes = 0

            # ------------------------------------------------
            # 3. Scan volumes
            # ------------------------------------------------
            for entry in os.listdir(book_dir):
                if not entry.lower().startswith("volume_"):
                    continue

                volumes += 1
                volume_path = os.path.join(book_dir, entry)

                if not os.path.isdir(volume_path):
                    continue

                # ---- TXT chapters ----
                for fname in os.listdir(volume_path):
                    if fname.lower().endswith(".txt"):
                        chapters_txt += 1

                # ---- Audio ----
                audio_dir = os.path.join(volume_path, "Audio")
                if os.path.isdir(audio_dir):
                    for fname in os.listdir(audio_dir):
                        if fname.lower().endswith(".m4b"):
                            audio_files += 1

        # ----------------------------------------------------
        # 4. SQL update (snapshot)
        # ----------------------------------------------------
        now = datetime.utcnow().isoformat(timespec="seconds")

        update_fields = {
            "downloaded": chapters_txt,
            "audio_done": audio_files,
            "last_update": now,
        }

        sql_update_book(book_idx, update_fields)

        sql_after = sql_fetch_book(book_idx)

        # ----------------------------------------------------
        # 5. Resultaat voor inspect/debug
        # ----------------------------------------------------
        result = {
            "book_idx": book_idx,
            "filesystem": {
                "book_dir": book_dir,
                "exists": os.path.isdir(book_dir),
                "volumes": volumes,
                "chapters_txt": chapters_txt,
                "audio_files": audio_files,
            },
            "sql_before": sql_before,
            "sql_after": sql_after,
            "notes": [],
        }

        log(
            f"[STATUSCHECK] book_idx={book_idx} "
            f"chapters={chapters_txt} audio={audio_files}"
        )

        return result