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#!/bin/bash

# Exit values are keyed as follows:
#   0 = No error
#   1 < 250 = Easy fix
#   250 <= 255 = Will not fix

#testing
#export PATH=/home/jhunk/.local/bin:/usr/lib64/qt-3.3/bin:/usr/lib64/ccache:/usr/local/bin:/usr/bin:/home/jhunk/bin:/usr/local/sbin:/usr/sbin

OS=`uname -s`
PLATFORM=`uname -p`
FETCH=
FETCH_ARGS=

CONTINUUM_BASE=https://repo.continuum.io/miniconda
CONTINUUM_RELEASE=Miniconda3
CONTINUUM_VERSION=latest
CONTINUUM_ARCH=x86_64
CONTINUUM_PLATFORM=
CONTINUUM_EXT=".sh"

STSCI_BASE=http://ssb.stsci.edu
STSCI_RELEASES=(
    conda
    conda-x
    conda-dev
)

# Update this as needed. We cannot simply rely on "2" or "3" conventions here because of how repos store data.
PYTHON_VERSIONS=(
    2.7
    3.5
)
_VERSION=$(echo ${CONTINUUM_RELEASE} | awk '{print tolower($0)}')
_INSTALL_PATH="$HOME/$_VERSION"
INSTALL_PATH="$_INSTALL_PATH"
INSTALL_ALTERNATE_PATH="$HOME/$_VERSION"_stsci

function repo_alive
{
    retval=1
    local REPO="$1"
    if [ -z "$REPO" ]; then
        echo "repo_alive requires an argument." >&2
        echo "usage: repo_alive {repo_url}" >&2
        exit 1
    fi
    REPO_ALIVE="$REPO/repo_alive.txt"
    ALIVE_FILE="$(basename $REPO_ALIVE)"

    $FETCH $FETCH_ARGS $REPO_ALIVE &>/dev/null

    if [ -f "$ALIVE_FILE" ]; then
        rm -f "$ALIVE_FILE"
        retval=0
    fi

    return $retval
}

function check_reinstall
{
    # Note, we don't care about the "root" environment. People can install whatever they want.
    local conflict=0
    local ENVIRONMENTS=`conda env list | egrep -v '#|^_|^root' | awk '{ print $1 }'`
    echo "Scanning Conda environment for conflicts:"
    for environ in $ENVIRONMENTS
    do
        msg="NO CONFLICT"

        conda list -n "$environ" -f '^stsci$|^stsci-.*' &>/dev/null
        retval=$?

        if [[ $retval > 0 ]]; then
            continue
        else
            for release in "${STSCI_RELEASES[@]}"
            do
                if [[ "stsci-$release" == $environ ]]; then
                    ((conflict++))
                fi
            done
        fi

        if [[ $conflict > 0 ]]; then
            msg="CONFLICT"
        fi

        printf "+ %-20s:%20s\n" "$environ" "$msg"

    done
    echo

    return $conflict
}

case "$OS" in
    Linux)
    CONTINUUM_PLATFORM=Linux
    FETCH="wget"
    FETCH_ARGS="-c"
    ;;
    Darwin)
    CONTINUUM_PLATFORM=MacOSX
    FETCH="curl"
    FETCH_ARGS="-O"
    ;;
esac

case "$PLATFORM" in
    i*86)
    CONTINUUM_ARCH=x86
    ;;
esac

if [[ $CONTINUUM_ARCH != x86_64 ]]; then
    echo "STScI does not support '$ARCH' packages."
    exit 255
fi

if [ -z "$CONTINUUM_PLATFORM" ]; then
    echo "STScI does not support '$OS'."
    exit 254
fi

if [ ! -x "`which $FETCH`" ]; then
    echo "Please install '$FETCH'. Unable to continue."
    exit 253
fi

INSTALLER="$CONTINUUM_RELEASE-$CONTINUUM_VERSION-$CONTINUUM_PLATFORM-$CONTINUUM_ARCH${CONTINUUM_EXT}"
CONTINUUM_URL="$CONTINUUM_BASE/$INSTALLER"

# Check for presence of [mini|ana]conda
CONDA=`which conda 2>/dev/null`
if [ -x "$CONDA" ]; then
    echo "An Anaconda installation is present on your system: $CONDA"
    echo

    check_reinstall
    found=$?
    if [[ $found > 0 ]]; then
        echo "To overwrite an existing installation:
    ./$(basename $0) --reinstall"
        echo
        echo "To squelch this behavior and perform a fresh installation:
    ./$(basename $0) --ignore-conflicts" 
        exit 4
    fi

    echo "Do you wish to use your existing conda installation? (recommended) [Y/n]"
    read choice
    case "$choice" in
        N*|n*)
            INSTALL_PATH="$INSTALL_ALTERNATE_PATH"
        ;;
        *)
        ;;
    esac
fi

if [[ $INSTALL_PATH != $_INSTALL_PATH ]]; then
    # User picked an alternative installation
    echo "Alternative installation path: $INSTALL_PATH"
    # Do installation
    $FETCH $FETCH_ARGS $CONTINUUM_URL
    chmod +x "$INSTALLER"
    ./"$INSTALLER" -p "$INSTALL_PATH"
    
    # This allows us to continue without having to recycle the environment:
    export PATH="$INSTALL_PATH/bin:$PATH"

    # Fall through to repository installation
fi


# Repository installation
for python_version in ${PYTHON_VERSIONS[@]}
do
    for release in ${STSCI_RELEASES[@]}
    do
        STSCI_URL="$STSCI_BASE/$release"
        release="stsci-$release-$python_version"
        logfile="/tmp/install-${release}.log"
    
        repo_alive "$STSCI_URL"
        alive=$?
        if [[ $alive < 1 ]]; then
            echo "$release repository is up."
        else
            echo "$release repository is down. (installation skipped)"
            continue
        fi
    
        /bin/echo -n "Installing $release (monitor progress with: tail -f $logfile) ... "
        ( conda create -y -n "$release" -c "$STSCI_URL" python=$python_version stsci 2>&1 ) > "$logfile"
        retval=$?
    
        if [[ $retval > 0 ]]; then
            printf "failed\n\tA problem occurred while installing %s. Please review the installation log.\n" "$release"
            echo
        else
            echo "done"
        fi
    done
done