#!/bin/bash

set -e -E -u -o pipefail

echo "installing lightgbm and its dependencies"
pip install \
    --prefer-binary \
    --upgrade \
    --constraint ./.ci/pip-envs/requirements-oldest.txt \
    "$(echo dist/*.whl)[arrow,pandas,scikit-learn]"

echo "installed package versions:"
pip freeze

echo ""
echo "checking that examples run without error"

# run a few examples to test that Python-package minimally works
echo ""
echo "--- advanced_example.py ---"
echo ""
python ./examples/python-guide/advanced_example.py || exit 1

echo ""
echo "--- logistic_regression.py ---"
echo ""
python ./examples/python-guide/logistic_regression.py || exit 1

echo ""
echo "--- simple_example.py ---"
echo ""
python ./examples/python-guide/simple_example.py || exit 1

echo ""
echo "--- sklearn_example.py ---"
echo ""
python ./examples/python-guide/sklearn_example.py || exit 1
echo ""

echo "checking that imports work without any optional dependencies"
pip uninstall --yes \
    cffi \
    dask \
    distributed \
    graphviz \
    joblib \
    matplotlib \
    pandas \
    psutil \
    pyarrow \
    scikit-learn

python -c "import lightgbm"

echo ""
echo "done testing on oldest supported Python version"