FROM python:3.12-slim AS base

ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

WORKDIR /app

# System packages:
#   tesseract-ocr / -eng — fallback OCR
#   poppler-utils        — pdf2image rasterization
#   libgl1, libglib2.0-0 — Paddle/Pillow/OpenCV image deps
#   ffmpeg               — video audio-track extraction + opencv decoders
#   build-essential      — for any wheels that need compilation
RUN apt-get update && apt-get install -y --no-install-recommends \
        build-essential \
        curl \
        tesseract-ocr \
        tesseract-ocr-eng \
        poppler-utils \
        libgl1 \
        libglib2.0-0 \
        ffmpeg \
    && rm -rf /var/lib/apt/lists/*

COPY pyproject.toml README.md ./
RUN mkdir -p app && touch app/__init__.py \
    && pip install --upgrade pip

# Install API deps first; install worker extras best-effort (Paddle wheels
# don't exist on every arch — Tesseract is the fallback in that case).
RUN pip install -e ".[dev]" \
    && (pip install ".[worker]" || (echo "WARN: full worker extras failed; installing without paddle" \
        && pip install pytesseract pdf2image Pillow numpy)) \
    && rm -rf /usr/local/lib/python3.12/site-packages/app

# Pre-bake the three retrieval models (embedder, reranker, BM25 sparse).
# Retry on HF 429s; FAIL the build if retries exhaust so the CI error is
# loud instead of producing an image whose worker can't embed/rerank.
ENV HF_HOME=/app/.cache/huggingface \
    XDG_CACHE_HOME=/app/.cache
RUN mkdir -p /app/.cache/huggingface && \
    for i in 1 2 3 4 5; do \
      if python -c "\
from sentence_transformers import SentenceTransformer, CrossEncoder; \
from fastembed import SparseTextEmbedding; \
SentenceTransformer('BAAI/bge-small-en-v1.5'); \
CrossEncoder('BAAI/bge-reranker-base'); \
list(SparseTextEmbedding(model_name='Qdrant/bm25').embed(['warmup']))\
"; then \
        break; \
      fi; \
      if [ "$i" = "5" ]; then \
        echo "FATAL: HF model download failed after 5 attempts"; exit 1; \
      fi; \
      echo "HF download attempt $i failed; sleeping $((i*15))s"; \
      sleep $((i*15)); \
    done

COPY app ./app
COPY alembic ./alembic
COPY alembic.ini ./alembic.ini

ENV PYTHONPATH=/app

CMD ["arq", "app.workers.config.WorkerSettings"]