# ---------- 빌더 단계 ----------
FROM python:3.11-slim AS builder

ENV PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    HF_HOME=/models \
    NLTK_DATA=/models/nltk_data \
    HF_HUB_DISABLE_TELEMETRY=1

RUN apt-get update && apt-get install -y --no-install-recommends \
        build-essential git ffmpeg libsndfile1 curl ca-certificates \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app
RUN mkdir -p /models/nltk_data

# Blackwell(sm_120) 지원 torch cu128 휠
RUN pip install torch==2.11.0 torchaudio==2.11.0 \
        --index-url https://download.pytorch.org/whl/cu128

COPY constraints.txt requirements.txt ./
RUN pip install -c constraints.txt -r requirements.txt

# MeloTTS(순수 파이썬) 벤더링
COPY vendor/melo /usr/local/lib/python3.11/site-packages/melo

# 한국어/영어 모델 사전 다운로드
COPY warmup.py ./
RUN python warmup.py

# 슬림화: 추론에 불필요한 패키지 제거
# - triton: torch.compile 전용(우리는 eager 추론이라 불필요)
# - gruut 미사용 언어(es/de/fr): 영어만 사용
RUN pip uninstall -y triton 2>/dev/null || true \
 && rm -rf /usr/local/lib/python3.11/site-packages/gruut_lang_es \
           /usr/local/lib/python3.11/site-packages/gruut_lang_de \
           /usr/local/lib/python3.11/site-packages/gruut_lang_fr \
           /usr/local/lib/python3.11/site-packages/gruut_lang_es-*.dist-info \
           /usr/local/lib/python3.11/site-packages/gruut_lang_de-*.dist-info \
           /usr/local/lib/python3.11/site-packages/gruut_lang_fr-*.dist-info \
 && find /usr/local/lib/python3.11/site-packages -name "__pycache__" -type d -prune -exec rm -rf {} + 2>/dev/null || true

# 슬림화 후에도 한/영 모델이 정상 로드되는지 검증
RUN python -c "from melo.api import TTS; [TTS(l, device='cpu') for l in ('KR','EN','JP','ZH')]; print('slim import ok')"

# ---------- 런타임 단계 ----------
FROM python:3.11-slim AS runtime

ENV PYTHONUNBUFFERED=1 \
    HF_HOME=/models \
    NLTK_DATA=/models/nltk_data \
    HF_HUB_DISABLE_TELEMETRY=1

# 런타임 필수 라이브러리만 (컴파일러 툴체인 제외)
RUN apt-get update && apt-get install -y --no-install-recommends \
        ffmpeg libsndfile1 libgomp1 ca-certificates \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app
COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages
COPY --from=builder /usr/local/bin /usr/local/bin
COPY --from=builder /models /models

COPY app ./app
COPY frontend ./frontend

# 기본 MeloTTS 단일 엔진 (자동 언어 감지: 한/영 혼합)
EXPOSE 8788
CMD ["uvicorn", "app.server:app", "--host", "0.0.0.0", "--port", "8788"]