#!/bin/bash 
#===============================================================================
#
#          FILE: install-nghdl.sh
# 
#         USAGE: ./install-nghdl.sh 
# 
#   DESCRIPTION: It is installation script for ngspice and ghdl work (nghdl). 
# 
#       OPTIONS: ---
#  REQUIREMENTS: ---
#          BUGS: ---
#         NOTES: ---
#        AUTHOR: Fahim Khan , fahim.elex@gmail.com
#  ORGANIZATION: eSim, FOSSEE group at IIT Bombay
#       CREATED: Tuesday 02 December 2014 17:01
#      REVISION:  ---
#===============================================================================

ngspice="ngspice-nghdl"
config_dir="$HOME/.nghdl"
config_file="config.ini"
src_dir=`pwd`

#Will be used to take backup of any file
sysdate="$(date)"
timestamp=`echo $sysdate|awk '{print $3"_"$2"_"$6"_"$4 }'`


#All functions goes here
function addghdlPPA
{
        ghdlppa="pgavin/ghdl"
        #Checking if ghdl ppa is already exist
        grep -h "^deb.*$ghdlppa*" /etc/apt/sources.list.d/* > /dev/null 2>&1
        if [ $? -ne 0 ]
        then
            echo "Adding ghdl PPA to install latest ghdl version"
            sudo add-apt-repository -y ppa:pgavin/ghdl
            sudo apt-get update
        else
            echo "ghdl is available in synaptic"
        fi
}

function installDependency
{
        echo "Installing ghdl.................................."
        sudo apt-get install -y ghdl
        echo "Installing flex.................................."
        sudo apt-get install -y flex
        echo "Installing bison................................."
        sudo apt-get install -y bison
}


function installNgspice
{
    echo "Installing ngspice..................................."
    #Checking if ngspice-nghdl directory is already present in Home directory
    if [ -d $HOME/$ngspice ];then
        echo "$ngspice directory already exist"
        echo "Leaving ngspice installation"
        

    else

        #Extracting Ngspice to Home Directory
        tar -xzvf $ngspice.tar.gz -C $HOME 

        if [ "$?" == 0 ];then 
            echo "Ngspice extracted sucessfuly to $HOME "
            #change to ngspice-nghdl directory
            cd $HOME/$ngspice
            #Make local install directory
            mkdir -p install_dir
            #Make release directory for build
            mkdir -p release
            #Change to release directory
            cd release
            echo "Installing Ngspice....."
            echo "------------------------------------"  
            sleep 5
            ../configure --enable-xspice --disable-debug  --prefix=$HOME/$ngspice/install_dir/ --exec-prefix=$HOME/$ngspice/install_dir/    
            make
            make install
            if [ "$?" == 0 ];then
                echo "Ngspice Installed sucessfully"
            else 
                echo "There was some error in installing ngspice"
            fi

        else 
            echo "Unable to extract ngspice tar file"
            exit 1;
        fi

    fi
}

function createConfigFile
{
    #Creating config.ini file and adding configuration information
    #Check if config file is present
    if [ -d $config_dir ];then
        rm $config_dir/$config_file && touch $config_dir/$config_file
    else
        mkdir $config_dir && touch $config_dir/$config_file

    fi
    
    echo "[NGSPICE]" >> $config_dir/$config_file
    echo "NGSPICE_HOME = $HOME/$ngspice" >> $config_dir/$config_file
    echo "DIGITAL_MODEL = %(NGSPICE_HOME)s/src/xspice/icm/ghdl" >> $config_dir/$config_file
    echo "RELEASE = %(NGSPICE_HOME)s/release" >> $config_dir/$config_file
    echo "[SRC]" >> $config_dir/$config_file
    echo "SRC_HOME = $src_dir" >> $config_dir/$config_file
    echo "LICENSE = %(SRC_HOME)s/LICENSE" >> $config_dir/$config_file

}

function createSoftLink
{

    ## Creating softlink 
    cd /usr/local/bin
    if [[ -L nghdl ]];then
        echo "Symlink was already present"
        sudo unlink nghdl
        sudo ln -sf $src_dir/src/ngspice_ghdl.py nghdl

    else
        echo "Creating synmlink"
        sudo ln -sf $src_dir/src/ngspice_ghdl.py nghdl
    fi
    cd $pwd

}

#####################################################################
#       Script start from here                                     #
#####################################################################
echo "Enter proxy details if you are connected to internet thorugh proxy"

echo -n "Is your internet connection behind proxy? (y/n): "
read getProxy
if [ $getProxy == "y" -o $getProxy == "Y" ];then
        echo -n 'Proxy hostname :'
        read proxyHostname

        echo -n 'Proxy Port :'
        read proxyPort

        echo -n username@$proxyHostname:$proxyPort :
        read username

        echo -n 'Password :'
        read -s passwd

        unset http_proxy
        unset https_proxy
        unset HTTP_PROXY
        unset HTTPS_PROXY
        unset ftp_proxy
        unset FTP_PROXY

        export http_proxy=http://$username:$passwd@$proxyHostname:$proxyPort
        export https_proxy=http://$username:$passwd@$proxyHostname:$proxyPort
        export HTTP_PROXY=http://$username:$passwd@$proxyHostname:$proxyPort
        export HTTPS_PROXY=http://$username:$passwd@$proxyHostname:$proxyPort
        export ftp_proxy=http://$username:$passwd@$proxyHostname:$proxyPort
        export FTP_PROXY=http://$username:$passwd@$proxyHostname:$proxyPort

        echo "Install with proxy"
        #Calling functions
        addghdlPPA
        installDependency
        if [ $? -ne 0 ];then
            echo -e "\n\n\nERROR: Unable to install required packages. Please check your internet connection.\n\n"
            exit 0
        fi
        installNgspice
        createConfigFile
        createSoftLink

elif [ $getProxy == "n" -o $getProxy == "N" ];then
        echo "Install without proxy"

        #Calling functions
        addghdlPPA
        installDependency
        if [ $? -ne 0 ];then
            echo -e "\n\n\nERROR: Unable to install required packages. Please check your internet connection.\n\n"
            exit 0
        fi
        installNgspice
        createConfigFile
        createSoftLink


else
        echo "Please select the right option"
        exit 0

fi