# =====================================================================================
#
#       Filename:  installer
#
#    Description:  Linux Installer for the program
#
#        Version:  1.0
#        Created:  03/08/2013 13:43:22 PM
#       Revision:  none
#       Compiler:  gcc
#
#         Author:  Siavash Ameli
#   Organization:  University of California, Berkeley
#
# =====================================================================================

#!bin/sh

# Switch to bash shell
ShellType=$(echo $0);
BashShell="bash";
NumberOfBashCharacters=${#BashShell};
LastCharactersOfShellType=${ShellType:${#ShellType} - $NumberOfBashCharacters}
if [ "$LastCharactersOfShellType" != "$BashShell" ];
then
    BashPath=$(which bash);
    if [ -n "$BashPath" ];
    then
         $bashPath
    fi  
fi

# Process input argument
UninstallStatus=false;
if [ -n "$1" ];
then
    if [ "$1" = "--uninstall" ];
    then
        UninstallStatus=true;
    else
        echo "Unknown option: $1"
        echo ""
        echo "Valid options: "
        echo "--uninstall  uninstall the existing program."
        exit
    fi
fi

# Requesting sudo command
if $UninstallStatus ;
then
    sudo echo "uninstaller program starts."
else
    sudo echo "installer program starts."
fi

# Set Variables
ProjectName="FlowTK"
ExecutableName="flowtk"
RepositoryURL="git://github.com/ameli/FlowTK"

# ==============
# Uninstallation
# ==============

if $UninstallStatus;
then
    # Find installation path
    InstalledPath=`which $ExecutableName`
    if [ -z "$InstalledPath" ];
    then
        if [ -f "/usr/local/bin/$ExecutableName" ];
        then
            InstalledPath="/usr/local/bin/$ExecutableName"
        elif [ -f "/usr/bin/$ExecutableName" ];
        then
            InstalledPath="/usr/bin/$ExecutableName"
        else
            echo "ERROR: Can not find the $ExecutableName program."
            exit
        fi
    fi

    # Uninstalling
    sudo rm $InstalledPath

    # Again, check installation path
    InstalledPath2=`which $ExecutableName`
    if [ -z "$InstalledPath2" ];
    then
        if [ -f "/usr/local/bin/$ExecutableName" ];
        then
            InstalledPath2="/usr/local/bin/$ExecutableName"
        elif [ -f "/usr/bin/$ExecutableName" ];
        then
            InstalledPath2="/usr/bin/$ExecutableName"
        fi
    fi

    # Check if uninstalled
    if [ -z "$InstalledPath2" ];
    then
        echo "$ExecutableName is uninstalled successfully."
        echo ""
    else
        echo "ERROR: can not uninstall $ExecutableName."
    fi

    exit
fi

# ============
# Installation
# ============

# Check Existing installation
PreviousInstallationPath=$(which $ExecutableName)

# Previous installation exists
if [ -n "$PreviousInstallationPath" ];
then
    echo "Previous installation exists at: $PreviousInstallationPath"

    # loop till user enters correct input (y/n)
    while true; do
        read -p "Do you want to replace existing installation? [y/n]: " ReplaceExistingInstallation

        # enter: n or N
        if [ "${ReplaceExistingInstallation,,}" = "n" ];
        then
            echo "Installation terminated."
            exit

        # enter: y or Y
        elif [ "${ReplaceExistingInstallation,,}" = "y" ];
        then
            break

        # no n/N/y/Y entered
        else
            echo "Not a valid answer. Please type 'y' or 'n': ";
        fi
    done
fi

# Set Build Directory
if [ -d "/tmp" ];
then
    BuildDirectory="/tmp/$ProjectName"
else
    BuildDirectory="$HOME/$ProjectName"
fi
echo "Build the program in $BuildDirectory"

# Delete existing build dir
if [ -d $BuildDirectory ];
then
    echo "Build directory already exists."
    echo "Try to remove previous directory ..."
    sudo rm -rf $BuildDirectory
    echo "Previous directory deleted successfully."
fi

# Create Build Directory
mkdir $BuildDirectory
cd $BuildDirectory

# Check current directory
CurrentDirectory="`pwd`"
if [ "$CurrentDirectory" != "$BuildDirectory" ];
then
    echo "ERROR: can not change directory to $BuildDirectory."
    exit
fi

# Check git exists
GitExists=`which git`
if [ -z "$GitExists" ];
then
    echo "git is not installed."
    echo "Try to install git ..."

    # Install git
    sudo apt-get install git -y
    
    # again, check if git exists
    GitExists2=`which git`
    if [ -z "$GitExists2" ];
    then
        echo "Attempt to install git failed."
        echo "Please download the Extract-Boundary program manually."
        exit
    else
        echo "git installed successfully."
    fi
fi

# Get the code from repository
git clone $RepositoryURL $BuildDirectory

# Check if something downloaded
DirectoryList=$(ls -A $BuildDirectory)
if [ -z "$DirectoryList" ];
then
    echo "FATAL ERROR: downloding program form repository failed."
    exit
fi

# Check if cmake exists
CmakeExists=`which cmake`
if [ -z "$CmakeExists" ];
then
    echo "cmake is not installed."
    echo "Try to install cmake ..."

    # Install cmake
    sudo apt-get install cmake -y

    # again, check if cmake exists
    CmakeExists2=`which cmake`
    if [ -z "$CmakeExists2" ];
    then
        echo "Attempt to install cmake failed"
        echo "Please install cmake."
        exit
    else
        echo "cmake installed successfully"
    fi
fi

# Makefile
cd $BuildDirectory
mkdir build
cd build
cmake ..

# Check if g++ installed
GPPExists=`which g++`
if [ -z "$GPPExists" ];
then
    echo "g++ is not installed,"
    echo "Try to install g++ ..."

    # Install g++
    sudo apt-get install build-essential -y

    # again check if g++ exists
    GPPExists2=`which g++`
    if [ -z "$GPPExists" ];
    then
        echo "Attempt to install g++ failed."
        echo "Please install build-essential"
        exit
    else
        echo "g++ installed successfully"
    fi
fi

# Compile
make
make package
sudo make install

echo ""
ExtractBoundaryExists=`which $ExecutableName`
if [ -z "$ExtractBoundaryExists" ];
then
    echo "Program did NOT install successfully."
else
    # remove build directory
    sudo rm -r $BuildDirectory
    echo "Program installed successfully."
fi
echo ""