#!/usr/bin/env bash

# posix compliant sanity check
if [ -z $BASH ] || [  $BASH = "/bin/sh" ]; then
    echo "Please use the bash interpreter to run this script"
    exit 1
fi

error() {
      printf '\E[31m'; echo "$@"; printf '\E[0m'
}
output() {
      printf '\E[36m'; echo "$@"; printf '\E[0m'
}


### START

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
BREW_FILE=$DIR/"brew-formulas.txt"
APT_PKGS_FILE=$DIR/"apt-packages.txt"

case `uname -s` in
    [Ll]inux)
        command -v lsb_release &>/dev/null || {
            error "Please install lsb-release."
            exit 1
        }

        distro=`lsb_release -cs`
        case $distro in
            maya|lisa|natty|oneiric|precise|quantal)
                output "Installing Ubuntu requirements"

                # DEBIAN_FRONTEND=noninteractive is required for silent mysql-server installation
                export DEBIAN_FRONTEND=noninteractive

                # install packages listed in APT_PKGS_FILE
                cat $APT_PKGS_FILE | xargs sudo apt-get -y install
                ;;
            *)
                error "Unsupported distribution - $distro"
                exit 1
               ;;
        esac
        ;;
    Darwin)

        if [[ ! -w /usr/local ]]; then
            cat<<EO

        You need to be able to write to /usr/local for
        the installation of brew and brew packages.

        Either make sure the group you are in (most likely 'staff')
        can write to that directory or simply execute the following
        and re-run the script:

        $ sudo chown -R $USER /usr/local
EO

            exit 1

        fi

        output "Installing OSX requirements"
        if [[ ! -r $BREW_FILE ]]; then
            error "$BREW_FILE does not exist, needed to install brew"
            exit 1
        fi

        # brew errors if the package is already installed
        for pkg in $(cat $BREW_FILE); do
            grep $pkg <(brew list) &>/dev/null || {
                output "Installing $pkg"
                brew install $pkg
            }
        done

        # paths where brew likes to install python scripts
        PATH=/usr/local/share/python:/usr/local/bin:$PATH

        command -v pip &>/dev/null || {
            output "Installing pip"
            easy_install pip
        }

        if ! grep -Eq ^1.7 <(virtualenv --version 2>/dev/null); then
            output "Installing virtualenv >1.7"
            pip install 'virtualenv>1.7' virtualenvwrapper
        fi

        command -v coffee &>/dev/null || {
            output "Installing coffee script"
            curl --insecure https://npmjs.org/install.sh | sh
            npm install -g coffee-script
        }
        ;;
    *)
        error "Unsupported platform"
        exit 1
        ;;
esac
