#!/usr/bin/env bash



PARITY_DEB_URL=https://github.com/ethcore/parity/releases/download/beta-0.9/parity_0.9.0-0_amd64.deb

function run_installer()
{
	####### Init vars
	
	HOMEBREW_PREFIX=/usr/local
	HOMEBREW_CACHE=/Library/Caches/Homebrew
	HOMEBREW_REPO=https://github.com/Homebrew/homebrew
	OSX_REQUIERED_VERSION="10.7.0"


	declare OS_TYPE
	declare OSX_VERSION
	declare GIT_PATH
	declare RUBY_PATH
	declare BREW_PATH
	declare INSTALL_FILES=""

	errorMessages=""
	isOsVersion=false
	isGit=false
	isRuby=false
	isBrew=false
	isDocker=false
	canContinue=true
	depCount=0
	depFound=0



	####### Setup colors

	red=`tput setaf 1`
	green=`tput setaf 2`
	yellow=`tput setaf 3`
	blue=`tput setaf 4`
	magenta=`tput setaf 5`
	cyan=`tput setaf 6`
	white=`tput setaf 7`
	b=`tput bold`
	u=`tput sgr 0 1`
	ul=`tput smul`
	xl=`tput rmul`
	stou=`tput smso`
	xtou=`tput rmso`
	dim=`tput dim`
	reverse=`tput rev`
	reset=`tput sgr0`


	function head() {
		echo "${blue}${b}==>${white} $1${reset}"
	}

	function info() {
		echo "${blue}${b}==>${reset} $1"
	}

	function successHeading() {
		echo "${green}${b}==> $1${reset}"
	}

	function success() {
		echo "${green}${b}==>${reset}${green} $1${reset}"
	}

	function error() {
		echo "${red}==> ${u}${b}${red}$1${reset}"
	}

	function smallError() {
		echo "${red}==>${reset} $1"
	}

	function green() {
		echo "${green}$1${reset}"
	}

	function red() {
		echo "${red}$1${reset}"
	}

	function check() {
		echo "${green}${bold} ✓${reset}	 $1${reset}"
	}

	function uncheck() {
		echo "${red}${bold} ✘${reset}	 $1${reset}"
	}



	####### Setup methods

	function wait_for_user() {
		while :
		do
			read -p "${blue}==>${reset} $1 [Y/n] " imp
			case $imp in
				[yY] ) return 0; break ;;
				'' ) echo; break ;;
				[nN] ) return 1 ;;
				* ) echo "Unrecognized option provided. Please provide either 'Y' or 'N'";
			esac
		done
	}

	function prompt_for_input() {
		while :
		do
			read -p "$1 " imp
			echo $imp
			return
		done
	}
	

	function detectOS() {
		if [[ "$OSTYPE" == "linux-gnu" ]]
		then
			OS_TYPE="linux"
			get_linux_dependencies
		elif [[ "$OSTYPE" == "darwin"* ]]
		then
			OS_TYPE="osx"
			get_osx_dependencies
		else
			OS_TYPE="win"
			abortInstall "${red}==>${reset} ${b}OS not supported:${reset} parity one-liner currently support OS X and Linux.\nFor instructions on installing parity on other platforms please visit ${u}${blue}http://ethcore.io/${reset}"
		fi

		echo

		if [[ $depCount == $depFound ]]
		then
			green "Found all dependencies ($depFound/$depCount)"
		else
			if [[ $canContinue == true ]]
			then
				red "Some dependencies are missing ($depFound/$depCount)"
			elif [[ $canContinue == false && $depFound == 0 ]]
			then
				red "All dependencies are missing and cannot be auto-installed ($depFound/$depCount)"
				abortInstall "$errorMessages";
			elif [[ $canContinue == false ]]
			then
				red "Some dependencies which cannot be auto-installed are missing ($depFound/$depCount)"
				abortInstall "$errorMessages";
			fi
		fi
	}

	function get_osx_dependencies()
	{
		macos_version
		find_git
		find_ruby
		find_brew
	}

	function macos_version()
	{
		declare -a reqVersion
		declare -a localVersion

		depCount=$((depCount+1))
		OSX_VERSION=`/usr/bin/sw_vers -productVersion 2>/dev/null`

		if [ -z "$OSX_VERSION" ]
		then
			uncheck "OS X version not supported 🔥"
			isOsVersion=false
			canContinue=false
		else
			IFS='.' read -a localVersion <<< "$OSX_VERSION"
			IFS='.' read -a reqVersion <<< "$OSX_REQUIERED_VERSION"

			if (( ${reqVersion[0]} <= ${localVersion[0]} )) && (( ${reqVersion[1]} <= ${localVersion[1]} ))
			then
				check "OS X Version ${OSX_VERSION}"
				isOsVersion=true
				depFound=$((depFound+1))
				return
			else
				uncheck "OS X version not supported"
				isOsVersion=false
				canContinue=false
			fi
		fi

		errorMessages+="${red}==>${reset} ${b}Mac OS version too old:${reset} eth requires OS X version ${red}$OSX_REQUIERED_VERSION${reset} at least in order to run.\n"
		errorMessages+="		Please update the OS and reload the install process.\n"
	}

	function find_eth()
	{
		ETH_PATH=`which parity 2>/dev/null`

		if [[ -f $ETH_PATH ]]
		then
			check "Found parity: $ETH_PATH"
			isEth=true
		else
			uncheck "parity is missing"
			isEth=false
		fi
	}

	function find_git()
	{
		depCount=$((depCount+1))

		GIT_PATH=`which git 2>/dev/null`

		if [[ -f $GIT_PATH ]]
		then
			check "$($GIT_PATH --version)"
			isGit=true
			depFound=$((depFound+1))
		else
			uncheck "Git is missing"
			isGit=false
		fi
	}

	function find_ruby()
	{
		depCount=$((depCount+1))

		RUBY_PATH=`which ruby 2>/dev/null`

		if [[ -f $RUBY_PATH ]]
		then
			RUBY_VERSION=`ruby -e "print RUBY_VERSION"`
			check "Ruby ${RUBY_VERSION}"
			isRuby=true
			depFound=$((depFound+1))
		else
			uncheck "Ruby is missing 🔥"
			isRuby=false
			canContinue=false
			errorMessages+="${red}==>${reset} ${b}Couldn't find Ruby:${reset} Brew requires Ruby which could not be found.\n"
			errorMessages+="		Please install Ruby using these instructions ${u}${blue}https://www.ruby-lang.org/en/documentation/installation/${reset}.\n"
		fi
	}

	function find_brew()
	{
		BREW_PATH=`which brew 2>/dev/null`

		if [[ -f $BREW_PATH ]]
		then
			check "$($BREW_PATH -v)"
			isBrew=true
			depFound=$((depFound+1))
		else
			uncheck "Homebrew is missing"
			isBrew=false

			INSTALL_FILES+="${blue}${dim}==> Homebrew:${reset}\n"
			INSTALL_FILES+=" ${blue}${dim}➜${reset}	 $HOMEBREW_PREFIX/bin/brew\n"
			INSTALL_FILES+=" ${blue}${dim}➜${reset}	 $HOMEBREW_PREFIX/Library\n"
			INSTALL_FILES+=" ${blue}${dim}➜${reset}	 $HOMEBREW_PREFIX/share/man/man1/brew.1\n"
		fi

		depCount=$((depCount+1))
	}

	function install_brew()
	{
		if [[ $isBrew == false ]]
		then
			head "Installing Homebrew"

			if [[ $isRuby == true ]]
			then
				ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
			else
				cd /usr

				if [[ ! -d $HOMEBREW_PREFIX ]]
				then
					sudo mkdir $HOMEBREW_PREFIX
					sudo chmod g+rwx $HOMEBREW_PREFIX
				fi

				if [[ ! -d $HOMEBREW_CACHE ]]
				then
					sudo mkdir $HOMEBREW_CACHE
					sudo chmod g+rwx $HOMEBREW_CACHE
				fi

				DEVELOPER_DIR=`/usr/bin/xcode-select -print-path 2>/dev/null`

				if [[ ! $(ls -A $DEVELOPER_DIR) || ! -f $DEVELOPER_DIR/usr/bin/git ]]
				then
					info "Installing the Command Line Tools (expect a GUI popup):"
					sudo /usr/bin/xcode-select --install

					echo "Press any key when the installation has completed"
				fi

				cd $HOMEBREW_PREFIX

				bash -o pipefail -c "curl -fsSL ${HOMEBREW_REPO}/tarball/master | tar xz -m --strip 1"
			fi

			find_brew
			echo

			if [[ $isBrew == false ]]
			then
				abortInstall "Couldn't install brew"
			fi
		fi
	}

	function osx_installer()
	{
		osx_dependency_installer

		info "Adding ethcore repository"
		brew tap ethcore/ethcore https://github.com/ethcore/homebrew-ethcore.git
		echo

		info "Updating brew"
		brew update
		echo

		info "Installing parity"
		if [[ $isEth == true ]]
		then
			brew reinstall parity
		else
			brew install parity
			brew linkapps parity
		fi
		echo
	}

	function osx_dependency_installer()
	{
		if [[ $isGit == false ]];
		then
			echo "Installing Git"
		fi

		if [[ $isRuby == false ]];
		then
			echo "Installing Ruby"
		fi

		if [[ $isBrew == false ]];
		then
			install_brew
		fi
	}

	function get_linux_dependencies()
	{
		find_apt
		find_docker
	}

	function find_apt()
	{
		APT_PATH=`which apt-get 2>/dev/null`

		if [[ -f $APT_PATH ]]
		then
			check "apt-get"
			echo "$($APT_PATH -v)"
			isApt=true
		else
			uncheck "apt-get is missing"
			isApt=false
		fi
	}

	function find_docker()
	{
		DOCKER_PATH=`which docker 2>/dev/null`

		if [[ -f $DOCKER_PATH ]]
		then
			check "docker"
			echo "$($DOCKER_PATH -v)"
			isDocker=true
		else
			isDocker=false
		fi
	}
	function linux_rocksdb_installer()
	{
		sudo add-apt-repository -y ppa:giskou/librocksdb
		sudo apt-get -f -y install
		sudo apt-get update
		sudo apt-get install -y librocksdb
	}

	function linux_installer()
	{
		info "Installing dependencies"
		sudo apt-get update && sudo apt-get install -q -y git curl g++ wget
		echo

		info "Installing rocksdb"
		linux_rocksdb_installer
		echo

		info "Installing parity"
		file=/tmp/parity.deb

		
		wget $PARITY_DEB_URL -qO $file
		sudo dpkg -i $file
		rm $file
	}

	function install_netstats()
	{
		echo "install netstats"

		if [[ $isDocker == false ]]
		then
			info "installing docker"
			curl -sSL https://get.docker.com/ | sh
		fi

		dir=$HOME/.netstats

		secret=$(prompt_for_input "Please enter the netstats secret:")
		instance_name=$(prompt_for_input "Please enter your instance name:")
		contact_details=$(prompt_for_input "Please enter your contact details (optional):")
		

		mkdir -p $dir
		cat > $dir/app.json << EOL
[
	{
		"name"							: "node-app",
		"script"						: "app.js",
		"log_date_format"		: "YYYY-MM-DD HH:mm Z",
		"merge_logs"				: false,
		"watch"							: false,
		"max_restarts"			: 10,
		"exec_interpreter"	: "node",
		"exec_mode"					: "fork_mode",
		"env":
		{
			"NODE_ENV"				: "production",
			"RPC_HOST"				: "localhost",
			"RPC_PORT"				: "8545",
			"LISTENING_PORT"	: "30303",
			"INSTANCE_NAME"		: "${instance_name}",
			"CONTACT_DETAILS" : "${contact_details}",
			"WS_SERVER"				: "wss://rpc.ethstats.net",
			"WS_SECRET"				: "${secret}",
			"VERBOSITY"				: 2
		
		}
	}
]
EOL

		sudo docker rm --force netstats-client 2> /dev/null
		sudo docker pull ethcore/netstats-client
		sudo docker run -d --net=host --name netstats-client -v $dir/app.json:/home/ethnetintel/eth-net-intelligence-api/app.json	 ethcore/netstats-client 
	}

	function install()
	{
		echo
		head "Installing Parity build dependencies"

		if [[ $OS_TYPE == "osx" ]]
		then
			osx_installer
		elif [[ $OS_TYPE == "linux" ]]
		then
			linux_installer
		fi
	}

	function verify_installation()
	{
		info "Verifying installation"
		find_eth

		if [[ $isEth == false ]]
		then
			abortInstall
		fi
	}

	function abortInstall()
	{
		echo
		error "Installation failed"
		echo -e "$1"
		echo
		exit 0
	}

	function finish()
	{
		echo
		successHeading "Installation successful!"
		#		head "Next steps"
		#		info "Run ${cyan}\`\`${reset} to get started.${reset}"
		echo
		exit 0
	}

	# Check dependencies
	head "Checking OS dependencies"
	detectOS

	echo
	head "In addition to the parity build dependencies, this script will install:"
	echo "$INSTALL_FILES"
	echo

	# Prompt user to continue or abort
	if wait_for_user "${b}OK,${reset} let's go!"
	then
		echo "Installing..."
	else
		abortInstall "${red}==>${reset} Process stopped by user. To resume the install run the one-liner command again."
	fi

	# Install dependencies and eth
	install

	if [[ $OS_TYPE == "linux" ]]
	then
		echo "Netstats:"
		head "Would you like to install and configure a netstats client?"
		if wait_for_user "${b}OK,${reset} let's go!"
		then
			install_netstats
		fi
	fi

	# Check installation
	verify_installation

	# Display goodby message
	finish
}

run_installer