#!/bin/bash

# Define echo function
# Blue color
function ee_lib_echo()
{
	echo $(tput setaf 4)$@$(tput sgr0)
}

# White color
function ee_lib_echo_info()
{
	echo $(tput setaf 7)$@$(tput sgr0)
}

# Red color
function ee_lib_echo_fail()
{
	echo $(tput setaf 1)$@$(tput sgr0)
}


# Checking permissions
if [[ $EUID -ne 0 ]]; then
	ee_lib_echo_fail "Sudo privilege required..."
	ee_lib_echo_fail "Uses: wget -qO ee rt.cx/ee && sudo bash ee"
	exit 1
fi

# Execute: apt-get update
ee_lib_echo "Executing apt-get update, please wait..."
apt-get update &>> /dev/null

# Checking lsb_release package
if [ ! -x  /usr/bin/lsb_release ]; then
	ee_lib_echo "Installing lsb-release, please wait..."
	apt-get -y install lsb-release &>> /dev/null
fi

# Define variables for later use
readonly EE_LOG_DIR=/var/log/easyengine
readonly EE_INSTALL_LOG=/var/log/easyengine/install.log
readonly EE_ERROR_LOG=/var/log/easyengine/error.log
readonly EE_LINUX_DISTRO=$(lsb_release -i |awk '{print $3}')
readonly EE_DEBIAN_VERSION=$(lsb_release -sc)

# Checking linux distro
if [ "$EE_LINUX_DISTRO" != "Ubuntu" ] && [ "$EE_LINUX_DISTRO" != "Debian" ]; then
	ee_lib_echo_fail "EasyEngine (ee) is made for Ubuntu and Debian only as of now"
	ee_lib_echo_fail "You are free to fork EasyEngine (ee): https://github.com/rtCamp/easyengine/fork"
	exit 100
fi

# EasyEngine (ee) only support all Ubuntu/Debian distro except the distro reached EOL
lsb_release -d | egrep -e "12.04|14.04|14.10|squeeze|wheezy" &>> /dev/null
if [ "$?" -ne "0" ]; then
	ee_lib_echo_fail "EasyEngine (ee) only support Ubuntu 12.04/14.04/14.10 and Debian 6.x/7.x"
	exit 100
fi


# Capture errors
function ee_lib_error()
{
	echo "[ `date` ] $(tput setaf 1)$@$(tput sgr0)" | tee -ai $EE_ERROR_LOG
	exit $2
}

# Check the specified package is installed or not
function ee_lib_package_check()
{
	local ee_package
	
	for ee_package in $@;do
		dpkg --get-selections | grep -v deinstall | grep $ee_package &>> $EE_INSTALL_LOG

		# Generate a list of not installed package
		if [ $? -ne 0 ]; then
			EE_PACKAGE_NAME="$EE_PACKAGE_NAME $ee_package"
		fi

	done
}

# Pre checks to avoid later screw ups
# Checking EasyEngine (ee) log directory
if [ ! -d $EE_LOG_DIR ]; then
	ee_lib_echo "Creating EasyEngine (ee) log directory, please wait..."
	mkdir -p $EE_LOG_DIR || ee_lib_error "Unable to create log directory $EE_LOG_DIR, exit status = " $?
	
	# Create EasyEngine log files
	touch /var/log/easyengine/{ee.log,install.log,update.log,error.log} \
	|| ee_lib_error "Unable to create EasyEngine log files in $EE_LOG_DIR, exit status = " $?

	# Keep EasyEngine log folder accessible to root only
	chmod -R 700 /var/log/easyengine \
	|| ee_lib_error "Unable to change permissions for EasyEngine log folder, exit status = " $?

fi

# Install required packages
if [ "$EE_LINUX_DISTRO" == "Ubuntu" ]; then
	ee_lib_package_check graphviz python-software-properties software-properties-common
elif [ "$EE_LINUX_DISTRO" == "Debian" ]; then
	ee_lib_package_check graphviz python-software-properties
fi

if [ ! -x  /usr/bin/tee ] || [ ! -x  /bin/ed ] || [ ! -x  /usr/bin/bc ] || [ ! -x  /usr/bin/wget ] || [ ! -x  /usr/bin/curl ] || [ ! -x  /bin/tar ] || [ ! -x  /usr/bin/git ] || [ -n "$EE_PACKAGE_NAME" ]; then
	ee_lib_echo "Installing required packages, please wait..." | tee -ai $EE_INSTALL_LOG
	apt-get -y install coreutils ed bc wget curl tar git-core $EE_PACKAGE_NAME | tee -ai $EE_INSTALL_LOG\
	|| ee_lib_error "Unable to install required packages, exit status = " $?
fi

# Checking name servers
if [[ -z $(cat /etc/resolv.conf 2> /dev/null | awk '/^nameserver/ { print $2 }') ]]; then
	ee_lib_echo_fail "Unable to detect name servers" && ee_lib_error "Unable to detect name servers, exit status = " $?
	ee_lib_echo_fail "Please configure /etc/resolv.conf" && ee_lib_error "Please configure /etc/resolv.conf, exit status = " $?
fi
# Pre checks end

# Decide EasyEngine (ee) branch
BRANCH=$1
if [ -z "$BRANCH" ]; then
	BRANCH=stable
else
	# Cross check EasyEngine (ee) branch name
	git ls-remote --heads https://github.com/rtCamp/easyengine | grep ${BRANCH}$ &>> $EE_INSTALL_LOG
	if [ $? -ne 0 ]; then
		ee_lib_error "The $BRANCH branch does not exist, please provide the correct branch name, exit status = " $?
	fi
fi

# Remove old version of EasyEngine (ee) 
rm -rf /tmp/easyengine &>> /dev/null

# Let's clone EasyEngine (ee)
ee_lib_echo "Cloning EasyEngine (ee) $BRANCH branch, please wait..." | tee -ai $EE_INSTALL_LOG
git clone -b $BRANCH https://github.com/rtCamp/easyengine.git /tmp/easyengine &>> $EE_INSTALL_LOG \
|| ee_lib_error "Unable to clone EasyEngine (ee) $BRANCH branch, exit status = " $?


# Setup EasyEngine (ee)
if [ ! -d /etc/easyengine ]; then
	mkdir -p /etc/easyengine \
	|| ee_lib_error "Unable to create /etc/easyengine directory, exit status = " $?
fi

if [ ! -d /usr/share/easyengine/ ]
then
	mkdir -p /usr/share/easyengine/ \
	|| ee_lib_error "Unable to create /usr/share/easyengine/ directory, exit status = " $?
fi

if [ ! -d /usr/local/lib/easyengine ]
then
	mkdir -p /usr/local/lib/easyengine \
	|| ee_lib_error "Unable to create /usr/local/lib/easyengine directory, exit status = " $?
fi


# Install EasyEngine (ee)
ee_lib_echo "Installing EasyEngine (ee), please wait..." | tee -ai $EE_INSTALL_LOG

# EasyEngine (ee) auto completion file
cp -a /tmp/easyengine/config/bash_completion.d/ee /etc/bash_completion.d/ &>> $EE_INSTALL_LOG \
|| ee_lib_error "Unable to copy EasyEngine (ee) auto completion file, exit status = " $?

# EasyEngine (ee) config file
cp -a /tmp/easyengine/config/easyengine/ee.conf /etc/easyengine/ &>> $EE_INSTALL_LOG \
|| ee_lib_error "Unable to copy EasyEngine (ee) config file, exit status = " $?

# Templates
cp -a /tmp/easyengine/config/nginx /tmp/easyengine/templates/* /usr/share/easyengine/ &>> $EE_INSTALL_LOG \
|| ee_lib_error "Unable to copy NGINX sample files, exit status = " $?

# EasyEngine (ee) library and modules
cp -a /tmp/easyengine/src/* /usr/local/lib/easyengine \
|| ee_lib_error "Unable to copy src files, exit status = " $?

# EasyEngine (ee) command
cp -a /tmp/easyengine/bin/easyengine /usr/local/sbin/ &>> $EE_INSTALL_LOG \
|| ee_lib_error "Unable to copy EasyEngine (ee) command, exit status = " $?

# Change permission of EasyEngine (ee) command
chmod 750 /usr/local/sbin/easyengine || ee_lib_error "Unable to change permission of EasyEngine (ee) command, exit status = " $?

# Create symbolic link
if [ ! -L /usr/local/sbin/ee ]; then
	ln -s /usr/local/sbin/easyengine /usr/local/sbin/ee
fi

# EasyEngine (ee) man page
cp -a /tmp/easyengine/docs/man/ee.8 /usr/share/man/man8/ &>> $EE_INSTALL_LOG \
|| ee_lib_error "Unable to copy EasyEngine (ee) man page, exit status = " $?

# Git config settings
GIT_USER_NAME=$(git config user.name)
GIT_USER_EMAIL=$(git config user.email)

if [ -z "$GIT_USER_NAME" ] || [ -z "$GIT_USER_EMAIL" ]; then
	echo
	ee_lib_echo "EasyEngine (ee) required your name & email address" | tee -ai $EE_INSTALL_LOG
	ee_lib_echo "to track changes you made under the Git version control" | tee -ai $EE_INSTALL_LOG
	ee_lib_echo "EasyEngine (ee) will be able to send you daily reports & alerts in upcoming version" | tee -ai $EE_INSTALL_LOG
	ee_lib_echo "EasyEngine (ee) will NEVER send your information across" | tee -ai $EE_INSTALL_LOG
fi

if [ -z "$GIT_USER_NAME" ]; then
	read -p "Enter your name [$(whoami)]: " GIT_USER_NAME
	# If enter is pressed
	if [[ $GIT_USER_NAME = "" ]]; then
		GIT_USER_NAME=$(whoami)
	fi
	git config --global user.name "${GIT_USER_NAME}"
	echo "git config user.name = $(git config user.name)" &>> $EE_INSTALL_LOG
fi

if [ -z "$GIT_USER_EMAIL" ];then
	read -p "Enter your email address [$(whoami)@$(hostname -f)]: " GIT_USER_EMAIL
	# If enter is pressed
	if [[ $GIT_USER_EMAIL = "" ]]
	then
		GIT_USER_EMAIL=$(whoami)@$(hostname -f)
	fi
	git config --global user.email $GIT_USER_EMAIL
	echo "git config user.email = $(git config user.email)" &>> $EE_INSTALL_LOG
fi

# Enable EasyEngine (ee) auto completion
echo
ee_lib_echo "For EasyEngine (ee) auto completion, run the following command" | tee -ai $EE_INSTALL_LOG
ee_lib_echo_info "source /etc/bash_completion.d/ee" | tee -ai $EE_INSTALL_LOG
echo

# Display success message
ee_lib_echo "EasyEngine (ee) installed successfully" | tee -ai $EE_INSTALL_LOG
ee_lib_echo "EasyEngine (ee) help: https://rtcamp.com/easyengine/docs/" | tee -ai $EE_INSTALL_LOG
echo