install

#!/usr/bin/env bash

# install location
LOCATION=/usr/local/bin

# exit top level program from subshell
trap "exit 1" TERM
export TOP_PID=$$
function fail() {
   kill -s TERM $TOP_PID
}

# platform IDs
LIN=linux
MAC=macos
WIN=windows

# returns this platform ID
function get_this_platform() {
    local this_platform="$(uname -s)"
    case $this_platform in
        Linux*) echo $LIN ;;
        Darwin*) echo $MAC ;;
        *)
            echo "Error: Unsupported platform $this_platform" >&2
            fail
        ;;
    esac
}

# actually sets this platform
THIS_PLATFORM=$(get_this_platform)

# fetches latest release download link for the platform
function get_latest_warp_link() {
    local this_platform=$1
    local info
    info=$(curl -fsSL https://api.github.com/repos/dgiagio/warp/releases)
    if [[ $? != 0 ]]; then
        echo "Error: Failed to get information about releases" >&2
        fail
    fi
    echo "$info" \
        | grep "browser_download_url" \
        | grep "$this_platform-x64.warp-packer" \
        | head -n 1 \
        | awk '{print $2}' \
        | sed -e 's/"//g'
}

# downloads and installs single binary
function install() {
    local name=$1
    local link=$2
    local temp_location="/tmp/$name"
    echo "Downloading $name..."
    curl -fsSL -o "$temp_location" "$link"
    if [[ $? != 0 ]]; then
        echo "Error: Failed to download $name" >&2
        fail
    fi
    echo "Creating $LOCATION/$name..."
    sudo install -D \
        --mode=755 \
        --owner=root \
        --group=root \
        "$temp_location" "$LOCATION"
    if [[ $? != 0 ]]; then
        echo "Error: Failed to install $name" >&2
        fail
    fi
}

# returns missing dependencies
function get_missing_deps() {
    local deps=( 
        "awk" \
        "curl" \
        "file" \
        "grep" \
        "sed" \
        "sort" \
        "tar" \
        "unzip" \
        "zip" \
    )
    for d in ${deps[@]}; do
        if ! command -v $d &> /dev/null ; then
            echo -n "$d "
        fi
    done
}

WARP4J_LINK="https://raw.githubusercontent.com/guziks/warp4j/stable/warp4j"

echo "Getting information about warp-packer releases..."
WARP_LINK=$(get_latest_warp_link $THIS_PLATFORM)

MISSING_DEPS=$(get_missing_deps)

install "warp-packer" "$WARP_LINK" && \
install "warp4j" "$WARP4J_LINK"

if [[ -z $MISSING_DEPS ]]; then
    echo "Successfully installed"
else
    echo "Main tools successfully installed"
    echo "Please install following with your package manager:"
    for d in ${MISSING_DEPS[@]}; do
            echo -n "$d "
    done
    echo
    exit 1
fi