#!/bin/bash

#### Variables
APT_INST="apt -y install"

PKG_DEPS=(php)

#### Functions
check_root() {
    if [ "$EUID" -ne 0 ]; then
        echo "Must be root to run $0"
        exit
    fi
}

choice() {
    echo -ne "[y/n]"
    while true
    do
        read -rN1 input
    case $input in
        [yY][eE][sS]|[yY])
        return 0

    break
    ;;
        [nN][oO]|[nN])
        return 1
        ;;
        esac
    done
}

check_deps() {
for PKG_NAME in "${PKG_DEPS[@]}"
  do
   if ! [ -x "$(command -v $PKG_NAME)" ]; then
     echo "Error: $PKG_NAME is not installed." >&2

     echo -ne "\nInstall $PKG_NAME ? "
     if choice 2>/dev/null; then
         echo -ne "\n$APT_INST $PKG_NAME\n"
         $APT_INST $PKG_NAME
     else
       echo -ne "\n\nAbort install script, package $PKG_NAME is required for work composer.\n"
       exit 1;
     fi

   fi
  done
}

composer_install() {
  php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
  php -r "if (hash_file('sha384', 'composer-setup.php') === 'e21205b207c3ff031906575712edab6f13eb0b361f2085f1f1237b7126d785e826a450292b6cfd1d64d92e6563bbde02') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
  php composer-setup.php
  php -r "unlink('composer-setup.php');"
  mv composer.phar /usr/local/bin/composer
}

#### Main

check_root
check_deps
composer_install