"""
Song Background Tasks

노래 생성 관련 백그라운드 태스크를 정의합니다.
"""

from datetime import date
from pathlib import Path

import aiofiles
import httpx
from sqlalchemy import select

from app.database.session import AsyncSessionLocal
from app.song.models import Song
from app.utils.common import generate_task_id
from app.utils.upload_blob_as_request import AzureBlobUploader
from config import prj_settings


async def download_and_save_song(
    task_id: str,
    audio_url: str,
    store_name: str,
) -> None:
    """백그라운드에서 노래를 다운로드하고 Song 테이블을 업데이트합니다.

    Args:
        task_id: 프로젝트 task_id
        audio_url: 다운로드할 오디오 URL
        store_name: 저장할 파일명에 사용할 업체명
    """
    print(f"[download_and_save_song] START - task_id: {task_id}, store_name: {store_name}")
    try:
        # 저장 경로 생성: media/song/{날짜}/{uuid7}/{store_name}.mp3
        today = date.today().strftime("%Y-%m-%d")
        unique_id = await generate_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 "song"
        file_name = f"{safe_store_name}.mp3"

        # 절대 경로 생성
        media_dir = Path("media") / "song" / today / unique_id
        media_dir.mkdir(parents=True, exist_ok=True)
        file_path = media_dir / file_name
        print(f"[download_and_save_song] Directory created - path: {file_path}")

        # 오디오 파일 다운로드
        print(f"[download_and_save_song] Downloading audio - task_id: {task_id}, url: {audio_url}")
        async with httpx.AsyncClient() as client:
            response = await client.get(audio_url, timeout=60.0)
            response.raise_for_status()

            async with aiofiles.open(str(file_path), "wb") as f:
                await f.write(response.content)
        print(f"[download_and_save_song] File saved - task_id: {task_id}, path: {file_path}")

        # 프론트엔드에서 접근 가능한 URL 생성
        relative_path = f"/media/song/{today}/{unique_id}/{file_name}"
        base_url = f"http://{prj_settings.PROJECT_DOMAIN}"
        file_url = f"{base_url}{relative_path}"
        print(f"[download_and_save_song] URL generated - task_id: {task_id}, url: {file_url}")

        # Song 테이블 업데이트 (새 세션 사용)
        async with AsyncSessionLocal() as session:
            # 여러 개 있을 경우 가장 최근 것 선택
            result = await session.execute(
                select(Song)
                .where(Song.task_id == task_id)
                .order_by(Song.created_at.desc())
                .limit(1)
            )
            song = result.scalar_one_or_none()

            if song:
                song.status = "completed"
                song.song_result_url = file_url
                await session.commit()
                print(f"[download_and_save_song] SUCCESS - task_id: {task_id}, status: completed")
            else:
                print(f"[download_and_save_song] Song NOT FOUND in DB - task_id: {task_id}")

    except Exception as e:
        print(f"[download_and_save_song] EXCEPTION - task_id: {task_id}, error: {e}")
        # 실패 시 Song 테이블 업데이트
        async with AsyncSessionLocal() as session:
            # 여러 개 있을 경우 가장 최근 것 선택
            result = await session.execute(
                select(Song)
                .where(Song.task_id == task_id)
                .order_by(Song.created_at.desc())
                .limit(1)
            )
            song = result.scalar_one_or_none()

            if song:
                song.status = "failed"
                await session.commit()
                print(f"[download_and_save_song] FAILED - task_id: {task_id}, status updated to failed")


async def download_and_upload_song_to_blob(
    task_id: str,
    audio_url: str,
    store_name: str,
) -> None:
    """백그라운드에서 노래를 다운로드하고 Azure Blob Storage에 업로드한 뒤 Song 테이블을 업데이트합니다.

    Args:
        task_id: 프로젝트 task_id
        audio_url: 다운로드할 오디오 URL
        store_name: 저장할 파일명에 사용할 업체명
    """
    print(f"[download_and_upload_song_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 "song"
        file_name = f"{safe_store_name}.mp3"

        # 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
        print(f"[download_and_upload_song_to_blob] Temp directory created - path: {temp_file_path}")

        # 오디오 파일 다운로드
        print(f"[download_and_upload_song_to_blob] Downloading audio - task_id: {task_id}, url: {audio_url}")
        async with httpx.AsyncClient() as client:
            response = await client.get(audio_url, timeout=60.0)
            response.raise_for_status()

            async with aiofiles.open(str(temp_file_path), "wb") as f:
                await f.write(response.content)
        print(f"[download_and_upload_song_to_blob] File downloaded - task_id: {task_id}, path: {temp_file_path}")

        # Azure Blob Storage에 업로드
        uploader = AzureBlobUploader(task_id=task_id)
        upload_success = await uploader.upload_music(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
        print(f"[download_and_upload_song_to_blob] Uploaded to Blob - task_id: {task_id}, url: {blob_url}")

        # Song 테이블 업데이트 (새 세션 사용)
        async with AsyncSessionLocal() as session:
            # 여러 개 있을 경우 가장 최근 것 선택
            result = await session.execute(
                select(Song)
                .where(Song.task_id == task_id)
                .order_by(Song.created_at.desc())
                .limit(1)
            )
            song = result.scalar_one_or_none()

            if song:
                song.status = "completed"
                song.song_result_url = blob_url
                await session.commit()
                print(f"[download_and_upload_song_to_blob] SUCCESS - task_id: {task_id}, status: completed")
            else:
                print(f"[download_and_upload_song_to_blob] Song NOT FOUND in DB - task_id: {task_id}")

    except Exception as e:
        print(f"[download_and_upload_song_to_blob] EXCEPTION - task_id: {task_id}, error: {e}")
        # 실패 시 Song 테이블 업데이트
        async with AsyncSessionLocal() as session:
            result = await session.execute(
                select(Song)
                .where(Song.task_id == task_id)
                .order_by(Song.created_at.desc())
                .limit(1)
            )
            song = result.scalar_one_or_none()

            if song:
                song.status = "failed"
                await session.commit()
                print(f"[download_and_upload_song_to_blob] FAILED - task_id: {task_id}, status updated to failed")

    finally:
        # 임시 파일 삭제
        if temp_file_path and temp_file_path.exists():
            try:
                temp_file_path.unlink()
                print(f"[download_and_upload_song_to_blob] Temp file deleted - path: {temp_file_path}")
            except Exception as e:
                print(f"[download_and_upload_song_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_song_by_suno_task_id(
    suno_task_id: str,
    audio_url: str,
    store_name: str,
    duration: float | None = None,
) -> None:
    """suno_task_id로 Song을 조회하여 노래를 다운로드하고 Azure Blob Storage에 업로드한 뒤 Song 테이블을 업데이트합니다.

    Args:
        suno_task_id: Suno API 작업 ID
        audio_url: 다운로드할 오디오 URL
        store_name: 저장할 파일명에 사용할 업체명
        duration: 노래 재생 시간 (초)
    """
    print(f"[download_and_upload_song_by_suno_task_id] START - suno_task_id: {suno_task_id}, store_name: {store_name}, duration: {duration}")
    temp_file_path: Path | None = None
    task_id: str | None = None

    try:
        # suno_task_id로 Song 조회하여 task_id 가져오기
        async with AsyncSessionLocal() as session:
            result = await session.execute(
                select(Song)
                .where(Song.suno_task_id == suno_task_id)
                .order_by(Song.created_at.desc())
                .limit(1)
            )
            song = result.scalar_one_or_none()

            if not song:
                print(f"[download_and_upload_song_by_suno_task_id] Song NOT FOUND - suno_task_id: {suno_task_id}")
                return

            task_id = song.task_id
            print(f"[download_and_upload_song_by_suno_task_id] Song found - suno_task_id: {suno_task_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 "song"
        file_name = f"{safe_store_name}.mp3"

        # 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
        print(f"[download_and_upload_song_by_suno_task_id] Temp directory created - path: {temp_file_path}")

        # 오디오 파일 다운로드
        print(f"[download_and_upload_song_by_suno_task_id] Downloading audio - suno_task_id: {suno_task_id}, url: {audio_url}")
        async with httpx.AsyncClient() as client:
            response = await client.get(audio_url, timeout=60.0)
            response.raise_for_status()

            async with aiofiles.open(str(temp_file_path), "wb") as f:
                await f.write(response.content)
        print(f"[download_and_upload_song_by_suno_task_id] File downloaded - suno_task_id: {suno_task_id}, path: {temp_file_path}")

        # Azure Blob Storage에 업로드
        uploader = AzureBlobUploader(task_id=task_id)
        upload_success = await uploader.upload_music(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
        print(f"[download_and_upload_song_by_suno_task_id] Uploaded to Blob - suno_task_id: {suno_task_id}, url: {blob_url}")

        # Song 테이블 업데이트 (새 세션 사용)
        async with AsyncSessionLocal() as session:
            result = await session.execute(
                select(Song)
                .where(Song.suno_task_id == suno_task_id)
                .order_by(Song.created_at.desc())
                .limit(1)
            )
            song = result.scalar_one_or_none()

            if song:
                song.status = "completed"
                song.song_result_url = blob_url
                if duration is not None:
                    song.duration = duration
                await session.commit()
                print(f"[download_and_upload_song_by_suno_task_id] SUCCESS - suno_task_id: {suno_task_id}, status: completed, duration: {duration}")
            else:
                print(f"[download_and_upload_song_by_suno_task_id] Song NOT FOUND in DB - suno_task_id: {suno_task_id}")

    except Exception as e:
        print(f"[download_and_upload_song_by_suno_task_id] EXCEPTION - suno_task_id: {suno_task_id}, error: {e}")
        # 실패 시 Song 테이블 업데이트
        if task_id:
            async with AsyncSessionLocal() as session:
                result = await session.execute(
                    select(Song)
                    .where(Song.suno_task_id == suno_task_id)
                    .order_by(Song.created_at.desc())
                    .limit(1)
                )
                song = result.scalar_one_or_none()

                if song:
                    song.status = "failed"
                    await session.commit()
                    print(f"[download_and_upload_song_by_suno_task_id] FAILED - suno_task_id: {suno_task_id}, status updated to failed")

    finally:
        # 임시 파일 삭제
        if temp_file_path and temp_file_path.exists():
            try:
                temp_file_path.unlink()
                print(f"[download_and_upload_song_by_suno_task_id] Temp file deleted - path: {temp_file_path}")
            except Exception as e:
                print(f"[download_and_upload_song_by_suno_task_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