"""
Video Background Tasks

영상 생성 관련 백그라운드 태스크를 정의합니다.
"""

import traceback
from pathlib import Path

import aiofiles
import httpx
from sqlalchemy import select
from sqlalchemy.exc import SQLAlchemyError

from app.database.session import BackgroundSessionLocal
from app.video.models import Video
from app.utils.upload_blob_as_request import AzureBlobUploader
from app.utils.logger import get_logger

# 로거 설정
logger = get_logger("video")

# HTTP 요청 설정
REQUEST_TIMEOUT = 300.0  # 초 (영상은 용량이 크므로 5분)


async def _update_video_status(
    task_id: str,
    status: str,
    video_url: str | None = None,
    creatomate_render_id: str | None = None,
) -> bool:
    """Video 테이블의 상태를 업데이트합니다.

    Args:
        task_id: 프로젝트 task_id
        status: 변경할 상태 ("processing", "completed", "failed")
        video_url: 영상 URL
        creatomate_render_id: Creatomate render ID (선택)

    Returns:
        bool: 업데이트 성공 여부
    """
    try:
        async with BackgroundSessionLocal() as session:
            if creatomate_render_id:
                query_result = await session.execute(
                    select(Video)
                    .where(Video.creatomate_render_id == creatomate_render_id)
                    .order_by(Video.created_at.desc())
                    .limit(1)
                )
            else:
                query_result = await session.execute(
                    select(Video)
                    .where(Video.task_id == task_id)
                    .order_by(Video.created_at.desc())
                    .limit(1)
                )

            video = query_result.scalar_one_or_none()

            if video:
                video.status = status
                if video_url is not None:
                    video.result_movie_url = video_url
                await session.commit()
                logger.info(f"[Video] Status updated - task_id: {task_id}, status: {status}")
                return True
            else:
                logger.warning(f"[Video] NOT FOUND in DB - task_id: {task_id}")
                return False

    except SQLAlchemyError as e:
        logger.error(f"[Video] DB Error while updating status - task_id: {task_id}, error: {e}")
        return False
    except Exception as e:
        logger.error(f"[Video] Unexpected error while updating status - task_id: {task_id}, error: {e}")
        return False


async def _download_video(url: str, task_id: str) -> bytes:
    """URL에서 영상을 다운로드합니다.

    Args:
        url: 다운로드할 URL
        task_id: 로그용 task_id

    Returns:
        bytes: 다운로드한 파일 내용

    Raises:
        httpx.HTTPError: 다운로드 실패 시
    """
    logger.info(f"[VideoDownload] Downloading - task_id: {task_id}")

    async with httpx.AsyncClient() as client:
        response = await client.get(url, timeout=REQUEST_TIMEOUT)
        response.raise_for_status()

        logger.info(f"[VideoDownload] SUCCESS - task_id: {task_id}, size: {len(response.content)} bytes")
        return response.content


async def download_and_upload_video_to_blob(
    task_id: str,
    video_url: str,
    store_name: str,
    user_uuid: str,
) -> None:
    """백그라운드에서 영상을 다운로드하고 Azure Blob Storage에 업로드한 뒤 Video 테이블을 업데이트합니다.

    Args:
        task_id: 프로젝트 task_id
        video_url: 다운로드할 영상 URL
        store_name: 저장할 파일명에 사용할 업체명
        user_uuid: 사용자 UUID (Azure Blob Storage 경로에 사용)
    """
    logger.info(f"[download_and_upload_video_to_blob] START - task_id: {task_id}, store_name: {store_name}")
    temp_file_path: Path | None = None

    try:
        # 파일명에 사용할 수 없는 문자 제거
        safe_store_name = "".join(
            c for c in store_name if c.isalnum() or c in (" ", "_", "-")
        ).strip()
        safe_store_name = safe_store_name or "video"
        file_name = f"{safe_store_name}.mp4"

        # 임시 저장 경로 생성
        temp_dir = Path("media") / "temp" / task_id
        temp_dir.mkdir(parents=True, exist_ok=True)
        temp_file_path = temp_dir / file_name
        logger.debug(f"[download_and_upload_video_to_blob] Temp directory created - path: {temp_file_path}")

        # 영상 파일 다운로드
        logger.info(f"[download_and_upload_video_to_blob] Downloading video - task_id: {task_id}, url: {video_url}")

        content = await _download_video(video_url, task_id)

        async with aiofiles.open(str(temp_file_path), "wb") as f:
            await f.write(content)

        logger.info(f"[download_and_upload_video_to_blob] File downloaded - task_id: {task_id}, path: {temp_file_path}")

        # Azure Blob Storage에 업로드
        uploader = AzureBlobUploader(user_uuid=user_uuid, task_id=task_id)
        upload_success = await uploader.upload_video(file_path=str(temp_file_path))

        if not upload_success:
            raise Exception("Azure Blob Storage 업로드 실패")

        # SAS 토큰이 제외된 public_url 사용
        blob_url = uploader.public_url
        logger.info(f"[download_and_upload_video_to_blob] Uploaded to Blob - task_id: {task_id}, url: {blob_url}")

        # Video 테이블 업데이트
        await _update_video_status(task_id, "completed", blob_url)
        logger.info(f"[download_and_upload_video_to_blob] SUCCESS - task_id: {task_id}")

    except httpx.HTTPError as e:
        logger.error(f"[download_and_upload_video_to_blob] DOWNLOAD ERROR - task_id: {task_id}, error: {e}", exc_info=True)
        await _update_video_status(task_id, "failed")

    except SQLAlchemyError as e:
        logger.error(f"[download_and_upload_video_to_blob] DB ERROR - task_id: {task_id}, error: {e}", exc_info=True)
        await _update_video_status(task_id, "failed")

    except Exception as e:
        logger.error(f"[download_and_upload_video_to_blob] EXCEPTION - task_id: {task_id}, error: {e}", exc_info=True)
        await _update_video_status(task_id, "failed")

    finally:
        # 임시 파일 삭제
        if temp_file_path and temp_file_path.exists():
            try:
                temp_file_path.unlink()
                logger.debug(f"[download_and_upload_video_to_blob] Temp file deleted - path: {temp_file_path}")
            except Exception as e:
                logger.warning(f"[download_and_upload_video_to_blob] Failed to delete temp file: {e}")

        # 임시 디렉토리 삭제 시도
        temp_dir = Path("media") / "temp" / task_id
        if temp_dir.exists():
            try:
                temp_dir.rmdir()
            except Exception:
                pass  # 디렉토리가 비어있지 않으면 무시


async def download_and_upload_video_by_creatomate_render_id(
    creatomate_render_id: str,
    video_url: str,
    store_name: str,
    user_uuid: str,
) -> None:
    """creatomate_render_id로 Video를 조회하여 영상을 다운로드하고 Azure Blob Storage에 업로드한 뒤 Video 테이블을 업데이트합니다.

    Args:
        creatomate_render_id: Creatomate API 렌더 ID
        video_url: 다운로드할 영상 URL
        store_name: 저장할 파일명에 사용할 업체명
        user_uuid: 사용자 UUID (Azure Blob Storage 경로에 사용)
    """
    logger.info(f"[download_and_upload_video_by_creatomate_render_id] START - creatomate_render_id: {creatomate_render_id}, store_name: {store_name}")
    temp_file_path: Path | None = None
    task_id: str | None = None

    try:
        # creatomate_render_id로 Video 조회하여 task_id 가져오기
        async with BackgroundSessionLocal() as session:
            result = await session.execute(
                select(Video)
                .where(Video.creatomate_render_id == creatomate_render_id)
                .order_by(Video.created_at.desc())
                .limit(1)
            )
            video = result.scalar_one_or_none()

            if not video:
                logger.warning(f"[download_and_upload_video_by_creatomate_render_id] Video NOT FOUND - creatomate_render_id: {creatomate_render_id}")
                return

            task_id = video.task_id
            logger.info(f"[download_and_upload_video_by_creatomate_render_id] Video found - creatomate_render_id: {creatomate_render_id}, task_id: {task_id}")

        # 파일명에 사용할 수 없는 문자 제거
        safe_store_name = "".join(
            c for c in store_name if c.isalnum() or c in (" ", "_", "-")
        ).strip()
        safe_store_name = safe_store_name or "video"
        file_name = f"{safe_store_name}.mp4"

        # 임시 저장 경로 생성
        temp_dir = Path("media") / "temp" / task_id
        temp_dir.mkdir(parents=True, exist_ok=True)
        temp_file_path = temp_dir / file_name
        logger.debug(f"[download_and_upload_video_by_creatomate_render_id] Temp directory created - path: {temp_file_path}")

        # 영상 파일 다운로드
        logger.info(f"[download_and_upload_video_by_creatomate_render_id] Downloading video - creatomate_render_id: {creatomate_render_id}, url: {video_url}")

        content = await _download_video(video_url, task_id)

        async with aiofiles.open(str(temp_file_path), "wb") as f:
            await f.write(content)

        logger.info(f"[download_and_upload_video_by_creatomate_render_id] File downloaded - creatomate_render_id: {creatomate_render_id}, path: {temp_file_path}")

        # Azure Blob Storage에 업로드
        uploader = AzureBlobUploader(user_uuid=user_uuid, task_id=task_id)
        upload_success = await uploader.upload_video(file_path=str(temp_file_path))

        if not upload_success:
            raise Exception("Azure Blob Storage 업로드 실패")

        # SAS 토큰이 제외된 public_url 사용
        blob_url = uploader.public_url
        logger.info(f"[download_and_upload_video_by_creatomate_render_id] Uploaded to Blob - creatomate_render_id: {creatomate_render_id}, url: {blob_url}")

        # Video 테이블 업데이트
        await _update_video_status(
            task_id=task_id,
            status="completed",
            video_url=blob_url,
            creatomate_render_id=creatomate_render_id,
        )
        logger.info(f"[download_and_upload_video_by_creatomate_render_id] SUCCESS - creatomate_render_id: {creatomate_render_id}")

    except httpx.HTTPError as e:
        logger.error(f"[download_and_upload_video_by_creatomate_render_id] DOWNLOAD ERROR - creatomate_render_id: {creatomate_render_id}, error: {e}", exc_info=True)
        if task_id:
            await _update_video_status(task_id, "failed", creatomate_render_id=creatomate_render_id)

    except SQLAlchemyError as e:
        logger.error(f"[download_and_upload_video_by_creatomate_render_id] DB ERROR - creatomate_render_id: {creatomate_render_id}, error: {e}", exc_info=True)
        if task_id:
            await _update_video_status(task_id, "failed", creatomate_render_id=creatomate_render_id)

    except Exception as e:
        logger.error(f"[download_and_upload_video_by_creatomate_render_id] EXCEPTION - creatomate_render_id: {creatomate_render_id}, error: {e}", exc_info=True)
        if task_id:
            await _update_video_status(task_id, "failed", creatomate_render_id=creatomate_render_id)

    finally:
        # 임시 파일 삭제
        if temp_file_path and temp_file_path.exists():
            try:
                temp_file_path.unlink()
                logger.debug(f"[download_and_upload_video_by_creatomate_render_id] Temp file deleted - path: {temp_file_path}")
            except Exception as e:
                logger.warning(f"[download_and_upload_video_by_creatomate_render_id] Failed to delete temp file: {e}")

        # 임시 디렉토리 삭제 시도
        if task_id:
            temp_dir = Path("media") / "temp" / task_id
            if temp_dir.exists():
                try:
                    temp_dir.rmdir()
                except Exception:
                    pass  # 디렉토리가 비어있지 않으면 무시