#!/usr/bin/env bash

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

darwin_install_pip3_packages() {
    echo "Installing setuptools grpcio-tools"
    pip3 install setuptools grpcio-tools
    echo "Installing mypy-protobuf"
    pip3 install --user mypy-protobuf
}

install_go_packages(){
        echo "Installing goavro"
        go get github.com/linkedin/goavro
        # As we are using bash, we are assuming .bashrc exists.
        grep -qxF "export GOPATH=${PWD}/sdks/go/examples/.gogradle/project_gopath" ~/.bashrc
        gopathExists=$?
        if [ $gopathExists -ne 0 ]; then
            export GOPATH=${PWD}/sdks/go/examples/.gogradle/project_gopath && echo "GOPATH was set for this session to '$GOPATH'. Make sure to add this path to your ~/.bashrc file after the execution of this script."
        fi
}

kernelname=$(uname -s)

# Running on Linux
if [ "$kernelname" = "Linux" ]; then
    # Assuming Debian based Linux and the prerequisites in https://beam.apache.org/contribute/ are met:
    apt-get update

    echo "Installing dependencies listed in pkglist file"
    apt-get install -y $(grep -v '^#' dev-support/docker/pkglist | cat) # pulling dependencies from pkglist file

    type -P python3 > /dev/null 2>&1
    python3Exists=$?
    type -P pip3 > /dev/null 2>&1
    pip3Exists=$?
    if [ $python3Exists -eq 0  -a $pip3Exists -eq 0 ]; then
        echo "Installing grpcio-tools mypy-protobuf"
        pip3 install grpcio-tools mypy-protobuf
    else
        echo "Python3 and pip3 are required but failed to install. Install them manually and rerun the script."
        exit
    fi

    type -P go > /dev/null 2>&1
    goExists=$?
    if [ $goExists -eq 0 ]; then
        install_go_packages
    else
        echo "Go is required. Install it manually from https://golang.org/doc/install and rerun the script."
        exit
    fi

# Running on Mac
elif [ "$kernelname" = "Darwin" ]; then
    # Check for Homebrew, install if we don't have it
    type -P brew > /dev/null 2>&1
    brewExists=$?
    if [ $brewExists -ne 0 ]; then
        echo "Installing homebrew"
        /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
    fi

    # Update homebrew recipes
    echo "Updating brew"
    brew update

    # Assuming we are using brew
    if brew ls --versions openjdk@8 > /dev/null; then
        echo "openjdk@8 already installed. Skipping"
    else
        echo "Installing openjdk@8"
        brew install openjdk@8
    fi
    for ver in 3.7 3.8 3.9; do
      if brew ls --versions python@$ver > /dev/null; then
          echo "python@$ver already installed. Skipping"
          brew info python@$ver
      else
          echo "Installing python@$ver"
          brew install python@$ver
      fi
      if [ ! $(type -P python$ver) > /dev/null 2>&1 ]; then
          # For some python packages, brew does not add symlinks...
          # TODO: Consider using pyenv to manage multiple installations of Python.
          ln -s /usr/local/opt/python@$ver/bin/python3 /usr/local/bin/python$ver
      fi
    done

    ls -l /usr/local/bin/python*

    type -P python3 > /dev/null 2>&1
    python3Exists=$?
    type -P pip3 > /dev/null 2>&1
    pip3Exists=$?
    if [ $python3Exists -eq 0  -a $pip3Exists -eq 0 ]; then
        darwin_install_pip3_packages
    else
        echo "Python3 and pip3 are required but failed to install. Install them manually and rerun the script."
        exit
    fi

    type -P tox > /dev/null 2>&1
    toxExists=$?
    if [ $toxExists -eq 0 ]; then
        echo "tox already installed. Skipping"
    else
        echo "Installing tox"
        brew install tox
    fi

    type -P docker > /dev/null 2>&1
    dockerExists=$?
    if [ $dockerExists -eq 0 ]; then
        echo "docker already installed. Skipping"
    else
        echo "Installing docker"
        brew install --cask docker
    fi

    type -P go > /dev/null 2>&1
    goExists=$?
    if [ $goExists -eq 0 ]; then
        install_go_packages
    else
        echo "Go is required. Install it manually from https://golang.org/doc/install and rerun the script."
        exit
    fi

else echo "Unrecognized Kernel Name: $kernelname"
fi