#!/bin/sh

set -e

SCRIPT_DIR=`dirname $0`
RELEASE_ROOT_DIR=`cd $SCRIPT_DIR/.. && pwd`
REL_NAME={{ rel_name }}
REL_VSN={{ rel_vsn }}
ERTS_VSN={{ erts_vsn }}
REL_DIR=$RELEASE_ROOT_DIR/releases/$REL_VSN
ERL_OPTS={{ erl_opts }}
PIPE_DIR=/tmp/erl_pipes/{{ rel_name }}/

find_erts_dir() {
    local erts_dir=$RELEASE_ROOT_DIR/erts-$ERTS_VSN
    if [ -d \"$erts_dir\" ]; then
        ERTS_DIR=$erts_dir;
        ROOTDIR=$RELEASE_ROOT_DIR
    else
        local erl=`which erl`
        local erl_root=`$erl -noshell -eval \"io:format(\\\"~s\\\", [code:root_dir()]).\" -s init stop`
        ERTS_DIR=$erl_root/erts-$ERTS_VSN
        ROOTDIR=$erl_root
    fi

}

find_sys_config() {
    local possible_sys=$REL_DIR/sys.config
    if [ -f \"$possible_sys\" ]; then
        SYS_CONFIG=\"-config $possible_sys\"
    fi
}

# Use $CWD/vm.args if exists, otherwise releases/APP_VSN/vm.args, or else etc/vm.args
if [ -e \"$RELEASE_ROOT_DIR/vm.args\" ]; then
    VMARGS_PATH=$RELEASE_ROOT_DIR/vm.args
    USE_DIR=$RELEASE_ROOT_DIR
else
    USE_DIR=$REL_DIR
    if [ -e \"$REL_DIR/vm.args\" ]; then
        VMARGS_PATH=\"$REL_DIR/vm.args\"
    else
        VMARGS_PATH=\"$REL_DIR/vm.args\"
    fi
fi

RUNNER_LOG_DIR=$RELEASE_ROOT_DIR/log
# Make sure log directory exists
mkdir -p $RUNNER_LOG_DIR

# Use releases/VSN/sys.config if it exists otherwise use etc/app.config
if [ -e \"$USE_DIR/sys.config\" ]; then
    CONFIG_PATH=\"$USE_DIR/sys.config\"
else
    if [ -e \"$REL_DIR/sys.config\" ]; then
        CONFIG_PATH=\"$REL_DIR/sys.config\"
    else
        CONFIG_PATH=\"$REL_DIR/app.config\"
    fi
fi

# Extract the target node name from node.args
NAME_ARG=`egrep '^-s?name' $VMARGS_PATH`
if [ -z \"$NAME_ARG\" ]; then
    echo \"vm.args needs to have either -name or -sname parameter.\"
    exit 1
fi

# Extract the name type and name from the NAME_ARG for REMSH
REMSH_TYPE=`echo $NAME_ARG | awk '{print $1}'`
REMSH_NAME=`echo $NAME_ARG | awk '{print $2}'`

# Note the `date +%s`, used to allow multiple remsh to the same node transparently
REMSH_NAME_ARG=\"$REMSH_TYPE remsh`date +%s`@`echo $REMSH_NAME | awk -F@ '{print $2}'`\"
REMSH_REMSH_ARG=\"-remsh $REMSH_NAME -boot start_clean\"

# Extract the target cookie
COOKIE_ARG=`grep '^-setcookie' $VMARGS_PATH`
if [ -z \"$COOKIE_ARG\" ]; then
    echo \"vm.args needs to have a -setcookie parameter.\"
    exit 1
fi

find_erts_dir
find_sys_config
export ROOTDIR=$RELEASE_ROOT_DIR
export BINDIR=$ERTS_DIR/bin
export EMU=beam
export PROGNAME=erl
export LD_LIBRARY_PATH=$ERTS_DIR/lib

cd $ROOTDIR

# Setup remote shell command to control node
REMSH=\"$BINDIR/erl $REMSH_NAME_ARG $REMSH_REMSH_ARG $COOKIE_ARG\"

# Setup command to control the node
NODETOOL=\"$BINDIR/escript $ROOTDIR/bin/nodetool $NAME_ARG $COOKIE_ARG\"

# Check the first argument for instructions
case \"$1\" in
    start|start_boot)

        # Make sure there is not already a node running
        #RES=`$NODETOOL ping`
        #if [ \"$RES\" = \"pong\" ]; then
        #    echo \"Node is already running!\"
        #    exit 1
        #fi
        case \"$1\" in
            start)
                shift
                START_OPTION=\"console\"
                HEART_OPTION=\"start\"
                ;;
            start_boot)
                shift
                START_OPTION=\"console_boot\"
                HEART_OPTION=\"start_boot\"
                ;;
        esac
        RUN_PARAM=$(printf \"'%s' \" \"$@\")
        HEART_COMMAND=\"$SCRIPT_DIR/bin/$REL_NAME $HEART_OPTION $RUN_PARAM\"
        export HEART_COMMAND
        mkdir -p $PIPE_DIR
        $BINDIR/run_erl -daemon $PIPE_DIR $RUNNER_LOG_DIR \"exec $RELEASE_ROOT_DIR/bin/$REL_NAME $START_OPTION $RUN_PARAM\" 2>&1
        ;;

    stop)
        # Wait for the node to completely stop...
        case `uname -s` in
            Linux|Darwin|FreeBSD|DragonFly|NetBSD|OpenBSD)
                # PID COMMAND
                PID=`ps ax -o pid= -o command=|
                    grep \"$SCRIPT_DIR/.*/[b]eam\"|awk '{print $1}'`
                ;;
            SunOS)
                # PID COMMAND
                PID=`ps -ef -o pid= -o args=|
                    grep \"$SCRIPT_DIR/.*/[b]eam\"|awk '{print $1}'`
                ;;
            CYGWIN*)
                # UID PID PPID TTY STIME COMMAND
                PID=`ps -efW|grep \"$SCRIPT_DIR/.*/[b]eam\"|awk '{print $2}'`
                ;;
        esac
        $NODETOOL stop
        ES=$?
        if [ \"$ES\" -ne 0 ]; then
            exit $ES
        fi
        while `kill -0 $PID 2>/dev/null`;
        do
            sleep 1
        done
        ;;

    restart)
        ## Restart the VM without exiting the process
        $NODETOOL restart
        ES=$?
        if [ \"$ES\" -ne 0 ]; then
            exit $ES
        fi
        ;;

    reboot)
        ## Restart the VM completely (uses heart to restart it)
        $NODETOOL reboot
        ES=$?
        if [ \"$ES\" -ne 0 ]; then
            exit $ES
        fi
        ;;

    ping)
        ## See if the VM is alive
        $NODETOOL ping
        ES=$?
        if [ \"$ES\" -ne 0 ]; then
            exit $ES
        fi
        ;;

    attach)
        # Make sure a node IS running
        RES=`$NODETOOL ping`
        ES=$?
        if [ \"$ES\" -ne 0 ]; then
            echo \"Node is not running!\"
            exit $ES
        fi

        shift
        exec $BINDIR/to_erl $PIPE_DIR
        ;;

    remote_console)
        # Make sure a node IS running
        RES=`$NODETOOL ping`
        ES=$?
        if [ \"$ES\" -ne 0 ]; then
            echo \"Node is not running!\"
            exit $ES
        fi

        shift
        exec $REMSH
        ;;

    upgrade|downgrade|install)
        if [ -z \"$2\" ]; then
            echo \"Missing package argument\"
            echo \"Usage: $REL_NAME $1 {package base name}\"
            echo \"NOTE {package base name} MUST NOT include the .tar.gz suffix\"
            exit 1
        fi

        # Make sure a node IS running
        RES=`$NODETOOL ping`
        ES=$?
        if [ \"$ES\" -ne 0 ]; then
            echo \"Node is not running!\"
            exit $ES
        fi

        node_name=`echo $NAME_ARG | awk '{print $2}'`
        erlang_cookie=`echo $COOKIE_ARG | awk '{print $2}'`

        exec $BINDIR/escript $ROOTDIR/bin/install_upgrade.escript $REL_NAME $node_name $erlang_cookie $2
        ;;

    console|console_clean|console_boot)
        # .boot file typically just $REL_NAME (ie, the app name)
        # however, for debugging, sometimes start_clean.boot is useful.
        # For e.g. 'setup', one may even want to name another boot script.
        case \"$1\" in
            console)        [ -f $REL_DIR/$REL_NAME.boot ] && BOOTFILE=$REL_DIR/$REL_NAME || BOOTFILE=$REL_DIR/start ;;
            console_clean)  BOOTFILE=$ROOTDIR/bin/start_clean ;;
            console_boot)
                shift
                BOOTFILE=\"$1\"
                shift
                ;;
        esac
        # Setup beam-required vars
        EMU=beam
        PROGNAME=`echo $0 | sed 's/.*\\///'`
        CMD=\"$BINDIR/erlexec -boot $BOOTFILE -env ERL_LIBS $REL_DIR/lib -config $CONFIG_PATH -args_file $VMARGS_PATH\"
        export EMU
        export PROGNAME

        # Dump environment info for logging purposes
        echo \"Exec: $CMD\" -- ${1+\"$@\"}
        echo \"Root: $ROOTDIR\"

        # Log the startup
        logger -t \"$REL_NAME[$$]\" \"Starting up\"

        # Start the VM
        exec $CMD -- ${1+\"$@\"}
        ;;

    foreground)
        # start up the release in the foreground for use by runit
        # or other supervision services

        [ -f $REL_DIR/$REL_NAME.boot ] && BOOTFILE=$REL_NAME || BOOTFILE=start
        FOREGROUNDOPTIONS=\"-noinput +Bd\"

        # Setup beam-required vars
        EMU=beam
        PROGNAME=`echo $0 | sed 's/.*\\///'`
        CMD=\"$BINDIR/erlexec $FOREGROUNDOPTIONS -boot $REL_DIR/$BOOTFILE -mode embedded -config $CONFIG_PATH -args_file $VMARGS_PATH\"
        export EMU
        export PROGNAME

        # Dump environment info for logging purposes
        echo \"Exec: $CMD\" -- ${1+\"$@\"}
        echo \"Root: $ROOTDIR\"

        # Start the VM
        exec $CMD -- ${1+\"$@\"}
        ;;
    *)
        echo \"Usage: $REL_NAME {start|start_boot <file>|foreground|stop|restart|reboot|ping|console|console_clean|console_boot <file>|attach|remote_console|upgrade}\"
        exit 1
        ;;
esac

exit 0