#!/usr/bin/env bash
#-------------------------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
#-------------------------------------------------------------------------------------------------------------
#
# Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/anaconda.md
# Maintainer: The VS Code and Codespaces Teams
#
# Syntax: ./anaconda-debian.sh [Conda version] [CONDA_DIR] [Non-root user] [Add rc files flag]

VERSION=${1:-"latest"}
export CONDA_DIR=${2:-"/usr/local/conda"}
USERNAME=${3:-"automatic"}
UPDATE_RC=${4:-"true"}

set -eux
export DEBIAN_FRONTEND=noninteractive

if [ "$(id -u)" -ne 0 ]; then
    echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
    exit 1
fi

# Ensure that login shells get the correct path if the user updated the PATH using ENV.
rm -f /etc/profile.d/00-restore-env.sh
echo "export PATH=${PATH//$(sh -lc 'echo $PATH')/\$PATH}" > /etc/profile.d/00-restore-env.sh
chmod +x /etc/profile.d/00-restore-env.sh

# Determine the appropriate non-root user
if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
    USERNAME=""
    POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
        if id -u ${CURRENT_USER} > /dev/null 2>&1; then
            USERNAME=${CURRENT_USER}
            break
        fi
    done
    if [ "${USERNAME}" = "" ]; then
        USERNAME=root
    fi
elif [ "${USERNAME}" = "none" ] || ! id -u ${USERNAME} > /dev/null 2>&1; then
    USERNAME=root
fi

architecture="$(uname -m)"
if [ "${architecture}" != "x86_64" ]; then
    echo "(!) Architecture $architecture unsupported"
    exit 1
fi

updaterc() {
    if [ "${UPDATE_RC}" = "true" ]; then
        echo "Updating /etc/bash.bashrc and /etc/zsh/zshrc..."
        if [[ "$(cat /etc/bash.bashrc)" != *"$1"* ]]; then
            echo -e "$1" >> /etc/bash.bashrc
        fi
        if [ -f "/etc/zsh/zshrc" ] && [[ "$(cat /etc/zsh/zshrc)" != *"$1"* ]]; then
            echo -e "$1" >> /etc/zsh/zshrc
        fi
    fi
}

# Checks if packages are installed and installs them if not
check_packages() {
    if ! dpkg -s "$@" > /dev/null 2>&1; then
        apt-get update
        apt-get -y install --no-install-recommends "$@"
    fi
}

# Install Conda if it's missing
if ! conda --version &> /dev/null ; then
    # Install dependencies
    check_packages wget ca-certificates

    mkdir -p $CONDA_DIR
    chown ${USERNAME}:root $CONDA_DIR
    echo "Installing Anaconda..."

    CONDA_VERSION=$VERSION
    if [ "${VERSION}" = "latest" ] || [ "${VERSION}" = "lts" ]; then
        CONDA_VERSION="2021.11"
    fi

    su --login -c "wget -q https://repo.anaconda.com/archive/Anaconda3-${CONDA_VERSION}-Linux-x86_64.sh -O /tmp/anaconda-install.sh \
        && /bin/bash /tmp/anaconda-install.sh -u -b -p ${CONDA_DIR}" ${USERNAME} 2>&1 
    
    if [ "${VERSION}" = "latest" ] || [ "${VERSION}" = "lts" ]; then
        PATH=$PATH:${CONDA_DIR}/bin
        conda update -y conda
    fi

    rm /tmp/anaconda-install.sh 
    updaterc "export CONDA_DIR=${CONDA_DIR}/bin"
fi

echo "Done!"