FROM node:20-alpine

WORKDIR /app

# ffmpeg: audio conversion for AWS Transcribe (WebM → PCM)
# curl: download Whisper models for browser-based transcription
RUN apk add --no-cache ffmpeg curl

COPY package.json ./
# argon2 compiles native code via node-gyp — needs python3/make/g++ at build time
RUN apk add --no-cache --virtual .build-deps python3 make g++ \
    && npm install --omit=dev \
    && apk del .build-deps

COPY . .

RUN mkdir -p /app/data/logs

# Download Browser Whisper (COMPLETE self-hosting - zero CDN dependencies)
# Library + Models all bundled and served from our server
RUN mkdir -p /app/public/models/Xenova/whisper-tiny.en/onnx && \
    cd /app/public/models && \
    echo "Downloading transformers.js library (worker-compatible build)..." && \
    curl -sL -o transformers.min.js https://cdn.jsdelivr.net/npm/@xenova/transformers@2.0.0/dist/transformers.min.js && \
    cd Xenova/whisper-tiny.en && \
    echo "Downloading Whisper model files..." && \
    curl -sL -o config.json https://huggingface.co/Xenova/whisper-tiny.en/resolve/main/config.json && \
    curl -sL -o tokenizer.json https://huggingface.co/Xenova/whisper-tiny.en/resolve/main/tokenizer.json && \
    curl -sL -o preprocessor_config.json https://huggingface.co/Xenova/whisper-tiny.en/resolve/main/preprocessor_config.json && \
    curl -sL -o generation_config.json https://huggingface.co/Xenova/whisper-tiny.en/resolve/main/generation_config.json && \
    curl -sL -o onnx/encoder_model_quantized.onnx https://huggingface.co/Xenova/whisper-tiny.en/resolve/main/onnx/encoder_model_quantized.onnx && \
    curl -sL -o onnx/decoder_model_merged_quantized.onnx https://huggingface.co/Xenova/whisper-tiny.en/resolve/main/onnx/decoder_model_merged_quantized.onnx && \
    echo "✅ Browser Whisper: 100% self-hosted (library: 760KB, models: 42MB)"

EXPOSE 3000

HEALTHCHECK --interval=30s --timeout=5s --start-period=20s \
  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/api/health || exit 1

CMD ["node", "server.js"]