#!/bin/bash
set -e

# Check if triton is installed and executable
function checkTritonInstalled () {
    command -v triton >/dev/null 2>&1 || { echo >&2 "Triton CLI tools do not appear to be installed. Please install before continuing."; exit 1; }
}

# Check if curl is installed and executable
function checkCurlInstalled () {
    command -v curl >/dev/null 2>&1 || { echo >&2 "curl is required to complete this installation. Please install before continuing."; exit 1; }
}

# Emit the current Triton profile and time
function currentProfile () {
    if [ -n "$TRITON_PROFILE" ]
    then
        local profile_source='via env var; use `eval "$(triton env <profile name>)"` to change'
    else
        local profile_source='default; use `triton profile set <profile name>` to change'
    fi

    echo "Executing in '$(triton profile get | awk 'NR == 1 {print $2}')' (${profile_source}) at $(date +'%r')"
}

# Check if the Docker binary (named triton-docker-helper)
# and Docker Compose (named triton-compose-helper) are installed and executable
function checkDockerInstalled () {
    if 
        [ ! -f /usr/local/bin/triton-docker-helper ] || 
        [ ! -x /usr/local/bin/triton-docker-helper ] ||
        [ '1.12.6,' != $(/usr/local/bin/triton-docker-helper -v | awk '{print $3}') ] ||
        [ ! -f /usr/local/bin/triton-compose-helper ] ||
        [ ! -x /usr/local/bin/triton-compose-helper ] ||
        [ '1.9.0,' != $(/usr/local/bin/triton-compose-helper -v | awk '{print $3}') ]
    then
        echo 'Additional or updated components are required.'
        echo 'Please run `sudo triton-docker-install` to continue.'
        echo
        exit 1
    fi
}

# Install architecture-specific Docker and Docker Compose binaries
function install () {
    echo "Triton needs to install additional components for Docker and Docker Compose interactions."
    echo "This installation will only happen once."

    # Check if curl is installed and executable
    checkCurlInstalled

    # Install the specific version of Docker for Triton
    rm -Rf /tmp/triton-docker /usr/local/bin/triton-docker-helper
    mkdir -p /tmp/triton-docker
    curl https://get.docker.com/builds/$(uname -a | awk '{ print $1 }')/x86_64/docker-1.12.6.tgz | tar zxvf - -C /tmp/triton-docker
    mv /tmp/triton-docker/docker/docker /usr/local/bin/triton-docker-helper
    rm -Rf /tmp/triton-docker
    chmod +x /usr/local/bin/triton-docker-helper

    echo "The triton-docker-helper is now installed."
    echo

    # Install the specific version of Docker Compose for Triton
    curl -Lo /usr/local/bin/triton-compose-helper https://github.com/docker/compose/releases/download/1.9.0/docker-compose-$(uname -a | awk '{ print $1 }')-x86_64
    chmod +x /usr/local/bin/triton-compose-helper

    echo "The triton-compose-helper is now installed."
    echo
}

# Install architecture-specific Docker and Docker Compose binaries
function checkAll () {
    checkTritonInstalled &&
    checkDockerInstalled &&
    currentProfile
}

case "`basename $0`" in
    triton-docker)
        checkAll &&
        eval "$(triton env)" &&
        exec /usr/local/bin/triton-docker-helper $@
        ;;
    triton-compose)
        checkAll &&
        eval "$(triton env)" &&
        export COMPOSE_HTTP_TIMEOUT=750 &&
        exec /usr/local/bin/triton-compose-helper $@
        ;;
    triton-docker-install)
        install
        ;;
esac