#!/usr/bin/env bash
set -e

main(){
    if [ -z "$PROG_PATH" ] || [ -z "$REPO" ]; then
        usage
        exit 1
    fi
    echo "Update for $REPO"
    api_url="https://api.github.com/repos/$REPO/releases/latest"
    dl_url=$(curl $SET_PROXY -sSfL $api_url | grep -P $MATCH_RELEASE | grep browser_download_url | cut -d '"' -f 4)
    echo "From: $dl_url"

    if [ $(echo -e "$dl_url" | wc -l) -ne 1 ] || [ -z $dl_url ]; then
        usage
        exit 1
    fi
    if [ -z $PROG_NAME ] || [ -z $VER_PARAM ] ; then
        curr_ver="VERSION_NOT_EXIST"
    else
        curr_ver=$($PROG_PATH/$PROG_NAME $VER_PARAM 2>/dev/null||echo VERSION_NOT_EXIST)
    fi
    if (echo $dl_url | grep -i $curr_ver) >/dev/null 2>&1; then
        echo "Already latest version!"
    else
        pkgname=$(echo $dl_url | awk -F'/' '{print $NF}')
        tmp_dir="/tmp/$pkgname-$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)"
        mkdir -p "$tmp_dir"
        pushd "$tmp_dir" >/dev/null 2>&1
        ext=$(echo $pkgname | awk -F'.' '{print $NF}')
        ext_tar=$(echo $pkgname | awk -F'.' '{print $(NF-1)}')
        dirname=
        if (echo $ext | grep -i zip) >/dev/null 2>&1; then
            curl $SET_PROXY -SfLo pkg.zip "$dl_url"
            unzip -o pkg.zip
            dirname=$(rev <<< $pkgname | cut -d '.' -f 2- | rev)
        elif (echo $ext_tar | grep -i tar) >/dev/null 2>&1; then
            curl $SET_PROXY -SfLo pkg.tar.$ext "$dl_url"
            tar -xvf pkg.tar.$ext
            dirname=$(rev <<< $pkgname | cut -d '.' -f 3- | rev)
        else
            echo "Unknown format: $pkgname"
            exit 1
        fi
        if [ ! -z "$PKG_DIR" ]; then
            if [ "$PKG_DIR" = "-" ]; then
                cd $(echo $dirname | sed $SED_EXP)
            else
                cd $PKG_DIR
            fi
        fi
        if [ -z $PROG_NAME ]; then
            cp -fr * "$PROG_PATH/"
            echo "Update Complete!"
        else
            cp -fr "$PROG_NAME" "$PROG_PATH/"
            chmod +x "$PROG_PATH/$PROG_NAME"
            if [ -z $VER_PARAM ]; then
                echo "Update Complete!"
            else
                echo "Update Complete ($curr_ver -> $($PROG_PATH/$PROG_NAME $VER_PARAM 2>/dev/null||echo VERSION_NOT_EXIST))!"
            fi
        fi

        popd >/dev/null
        rm -rf "$tmp_dir"
        if [ ! -z "$SRV_NAME" ]; then
            systemctl restart $SRV_NAME
        fi
    fi
}

usage(){
    echo "Usage: $0 [OPTIONS]";
    echo "Options:";
    echo "    -p <PATH>        Program path";
    echo "    -n <NAME>        Program name";
    echo "    -r <REPO>        Github repo";
    echo "    -m <MATCH>       Match release with regexp";
    echo "    -d <DIR>         Dir inside package (set '-' as packge name)";
    echo "    -e <EXP>         Expression for sed (only for '-d -')";
    echo "    -v <VERSION>     Version param";
    echo "    -s <SERVICE>     Service name";
    echo "    -x <PROXY>       Proxy [protocol://]host[:port]";
}

PROG_PATH=
PROG_NAME=
REPO=
MATCH_RELEASE=
PKG_DIR=
SED_EXP=
VER_PARAM=
SRV_NAME=
SET_PROXY=
while getopts ":p:n:r:m:d:e:v:s:x:" OPT; do
    case $OPT in
        p)
            PROG_PATH=$OPTARG;
            ;;
        n)
            PROG_NAME=$OPTARG;
            ;;
        r)
            REPO=$OPTARG;
            ;;
        m)
            MATCH_RELEASE=$OPTARG;
            ;;
        d)
            PKG_DIR=$OPTARG;
            ;;
        e)
            SED_EXP=$OPTARG;
            ;;
        v)
            VER_PARAM=$OPTARG;
            ;;
        s)
            SRV_NAME=$OPTARG;
            ;;
        x)
            SET_PROXY="-x $OPTARG";
            ;;
        :)
            echo "Option -$OPTARG requires an argument.";
            exit 1;;
        ?)
            echo "Invalid Option: -$OPTARG";
            usage;
            exit 1;;
    esac;
done;

main