FROM python:3.8-alpine

WORKDIR /usr/src/

# setting the correct timezone requires "zdtata"
# numpy (dependency of matplotlib) requires "make automake gcc ..."
#   source: https://stackoverflow.com/a/48349161/6334421
# pillow (dependency of matplotlib) requires "zlib-dev jpeg-dev ..."
RUN apk update && \
    apk add \
        tzdata \
        make automake gcc g++ subversion python3-dev \
        zlib-dev jpeg-dev freetype-dev lcms2-dev libwebp-dev tcl-dev tk-dev harfbuzz-dev \
          fribidi-dev libimagequant-dev libxcb-dev && \
    rm -rf /var/cache/apk/*

# source: https://serverfault.com/a/683651/537998
ENV TZ=Europe/Berlin
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

RUN python3 -m pip install --no-cache-dir --upgrade pip

# LDFLAGS required for "pip install pillow"
# otherwise this would be necessary:
## RUN ln -s /usr/lib/x86_64-linux-gnu/libz.so /lib/
## RUN ln -s /usr/lib/x86_64-linux-gnu/libjpeg.so /lib/
# source: https://github.com/python-pillow/Pillow/issues/3103#issuecomment-382634946
ENV LDFLAGS=-L/usr/lib/x86_64-linux-gnu/

COPY requirements.txt ./
RUN python3 -m pip install --no-cache-dir --upgrade -r requirements.txt
#
# if the above fails, try using the below instead
#
#RUN python3 -m pip install --no-cache-dir --upgrade requests
#RUN python3 -m pip install --no-cache-dir --upgrade setuptools
#RUN python3 -m pip install --no-cache-dir --upgrade numpy
#RUN python3 -m pip install --no-cache-dir --upgrade pillow
#RUN python3 -m pip install --no-cache-dir --upgrade matplotlib

COPY src/ ./
RUN chmod +x langfingaz/main.py

# unbuffered output option otherwise script sleeps before any output appears
# python -u
ENTRYPOINT [ "python", "./langfingaz/main.py" ]
CMD [ "log-verbose" ]