#!/bin/bash

#AUTH hwding
#DATE Feb 19 2019
#DESC install unstamp as a command

user_bin=`echo ~`"/bin/"
locl_bin="/usr/local/bin/"
jar_name="pdf-unstamper.jar"
exe_name="unstamp"
_version="0.2.5"
jar_durl="https://github.com/hwding/pdf-unstamper/releases/download/$_version/$jar_name"
wrapper="#!/bin/bash\njava -jar ${user_bin}${jar_name} \"\$@\"\n"

# default option(s)
create_link=1

# check if the script is running in root
if [ ! $UID -eq 0 ]; then
    echo -e "$(tput setaf 1)> plz run this script in root permission$(tput sgr 0)"
    exit -1
fi

# parse option(s)
while getopts ":d:w" opt; do
    case "${opt}" in
        w)
            create_link=0
            ;;
        d)
            given_dir="${OPTARG}"

            # complete the slash at the end of the given directory
            [[ "${given_dir: -1}" == "/" ]] && user_bin=${given_dir} || user_bin="${given_dir}/"
            ;;
    esac
done
shift $((OPTIND-1))

function chk_f() {
    if [ ! -f "$1" ]; then
        return 0;
    else
        return 1;
    fi
}

function chk_l() {
    if [ ! -L "$1" ]; then
        return 0;
    else
        return 1;
    fi
}

function chk_d() {
    if [ ! -d $1 ]; then
        return 0;
    else
        return 1;
    fi
}

echo -e "\n╭──────────────────────────────────────────────╮"
echo -e "│          Installer for pdf-unstamper         │"
echo -e "│    $(tput setaf 6)https://github.com/hwding/pdf-unstamper$(tput sgr 0)   │"
echo -e "╰──────────────────────────────────────────────╯\n"

# check JRE installation
if type -p java > /dev/null 2>&1; then
    _java=1
    echo -e "$(tput setaf 2)> JRE detected in PATH$(tput sgr 0)"
elif [[ -n "$JAVA_HOME" ]] && [[ -x "$JAVA_HOME/bin/java" ]]; then
    _java=1
    echo -e "$(tput setaf 2)> JRE detected in JAVA_HOME$(tput sgr 0)"
else
    _java=0
    echo -e -n "$(tput setaf 1)> no JRE installed, continue? [ENTER]$(tput sgr 0)"
    read
fi

# check JRE version
if [ ${_java} -gt 0 ]; then
    version=$(java -version 2>&1 | awk -F '"' '/version/ {print $2}')
    if [[ "$version" > "1.8" ]]; then
        echo -e "$(tput setaf 2)> JRE version is at least 1.8$(tput sgr 0)"
    else         
        echo -e -n "$(tput setaf 1)> JRE version less than 1.8, continue? [ENTER]$(tput sgr 0)"
        read
    fi
fi

# check ~/bin/
chk_d ${user_bin}
if [ $? -eq 0 ]; then
    echo -e -n "$(tput setaf 1)> target dir $user_bin not detected, create? [ENTER]$(tput sgr 0)"
    read
    `mkdir ${user_bin}`
else
    echo -e "$(tput setaf 2)> target dir $user_bin detected$(tput sgr 0)"
fi

# remove old JAR in current dir
chk_f "$jar_name"
if [ $? -eq 1 ]; then
    `rm ${jar_name}`
fi

# check if we have a proper download tool before downloading
if ! type -p wget > /dev/null 2>&1; then
    if ! type -p curl > /dev/null 2>&1; then
        echo -e "$(tput setaf 1)> you must have wget or curl to download the JAR$(tput sgr 0)"
        exit -1
    fi

    # download with curl
    echo -n "> downloading $jar_name version $_version from GitHub using curl..."
    `curl -L -o ${jar_name} ${jar_durl} > /dev/null 2>&1`
else

    # download with wget
    echo -n "> downloading $jar_name version $_version from GitHub using wget..."
    `wget ${jar_durl} > /dev/null 2>&1`
fi
echo "done"

# generate wrapper
chk_f ${exe_name}
if [ $? -eq 0 ]; then
    echo "> generating wrapper..."
    echo -e ${wrapper} > ${exe_name}
fi

# remove old JAR & wrapper in ~/bin
chk_f "${user_bin}${jar_name}"
if [ $? -eq 1 ]; then
    echo "> removing old version of $jar_name"
    `rm ${user_bin}${jar_name}`
fi
chk_f "${user_bin}${exe_name}"
if [ $? -eq 1 ]; then
    echo "> removing old version of $exe_name"
    `rm ${user_bin}${exe_name}`
fi

# install new JAR & wrapper
echo "> installing ${exe_name}..."
`mv ${jar_name} ${user_bin}`
`mv ${exe_name} ${user_bin}`

# grant permission
echo "> granting executable permission to wrapper..."
`chmod +x ${user_bin}${exe_name}`

# create soft link
if [ ${create_link} -gt 0 ]; then
    echo "> linking ${user_bin}${exe_name} to ${locl_bin}${exe_name}"
    chk_l "${locl_bin}${exe_name}"
    if [ $? -eq 1 ]; then
        `rm ${locl_bin}${exe_name}`
    fi
    `ln -s ${user_bin}${exe_name} ${locl_bin}${exe_name}`
fi

echo -e "$(tput setaf 2)> ${exe_name} installed as ${user_bin}${exe_name}$(tput sgr 0)"
echo "> hava a nice day"
echo