#!/bin/bash

SCRIPT_PARAMS="$*"
SCRIPT_PATHNAME=$(realpath ${0})
SCRIPT_NAME=$(basename ${SCRIPT_PATHNAME})
SCRIPT_PATH=$(dirname ${SCRIPT_PATHNAME})

export LOGFILE=/dev/null
export BRANCH_NAME=develop
export IS_DUMMY=false
export IS_VERBOSE=false

#**********************************************************************************************
# local helper functions
#**********************************************************************************************
#----------------------------------------------------------------------------------------------
function printUsage()
{
    echo -e "\nUsage: ${SCRIPT_NAME} [OPTIONS]\n"
    echo -e ""
    echo -e "   OPTIONS:"
    echo -e "     -b|--branch=BRANCH_NAME    commit to branch BRANCH_NAME (default = ${BRANCH_NAME})"
    echo -e "     -d|--dummy-commit          display found SRVREVs"
    echo -e "     -l|--log=LOGFILE           write some output to LOGFILE (default = $LOGFILE)"
    echo -e "     -h|--help                  Show this help"
    echo -e "     -v|--verbose               Set script to verbose"
}
#----------------------------------------------------------------------------------------------
function logMessage()
{
    local msg="${1}"
    echo "${msg}" >> $LOGFILE
}
#----------------------------------------------------------------------------------------------
function printMessage()
{
    local msg="${1}"
    logMessage "${msg}"
    if [[ "${IS_VERBOSE}" == "false" ]]; then
        return
    fi
    echo "${msg}"
}
#----------------------------------------------------------------------------------------------
function updateLayerToHead() {
    local layer="${1}"
    local branch="${2}"

    logMessage "--> checking out branch ${BRNCH_NAME}"
    git checkout ${BRANCH_NAME} >> $LOGFILE 2>&1
    logMessage "--> pull changes ${BRANCH_NAME}"
    git pull >> $LOGFILE 2>&1
}

#**********************************************************************************************
# main
#**********************************************************************************************
O=$(getopt -o hb:l:vd --long help,branch:,log:,verbose,dummy-commit -- "$@") || exit 1
if [ $? != 0 ]; then 
    echo "ERROR: Could not parse command line options"
    exit 1
fi

eval set -- "$O"
while true; do
    case "${1}" in
        -b|--branch)
            export BRANCH_NAME="${2}"
            shift 2
            ;;
        -v|--verbose)
            export IS_VERBOSE=true
            shift
            ;;
        -d|--dummy-commit)
            export IS_DUMMY=true
            shift
            ;;
        -l|--log)
            export LOGFILE="${2}"
            export LOGFILE=$(realpath "${LOGFILE}")
            shift 2
            ;;
        -h|--help)
            export IS_VERBOSE=false
            printUsage
            exit 0
            ;;
        --)
            shift
            break
            ;;
        *)
            printUsage; exit 0 ;;
    esac
done

echo "${SCRIPT_NAME} called with ${SCRIPT_PARAMS}" > $LOGFILE


for nmLayer in $(git status | grep "meta-netmodule" | cut -d':' -f2 | sed -e 's/^[ ]*//' | cut -d' ' -f1); do
    cd $nmLayer
    nbrChanges=$(git status | grep "modified:" | wc -l)
    printMessage "${nbrChanges} changes in layer ${nmLayer}"
    if [[ "${nbrChanges}" != "0" ]]; then
        logMessage "--> stash the changes first to checkout branch head..."
        git stash save >> $LOGFILE 2>&1
        updateLayerToHead "${nmLayer}" "${BRANCH_NAME}"
        logMessage "--> get changes back from stash..."
        git stash pop >> $LOGFILE 2>&1
        logMessage "--> adding tracked and changed files"
        git add -u >> $LOGFILE 2>&1
        printMessage "--> committing and pushing..."
        commitMsg="${nmLayer}: updated source revisions"
        if [[ "${IS_DUMMY}" == "true" ]]; then
            printMessage "    dummy commit: msg='${commitMsg}', content:"
            git status | grep "modified" >> $LOGFILE 2>&1
            # revert changes to simulate a commit :-P
            git reset HEAD * > /dev/null
            git checkout * > /dev/null
        else
            git commit -m "${commitMsg}" >> $LOGFILE 2>&1
            git push >> $LOGFILE 2>&1
        fi
        printMessage "----------"
    fi
    cd ..
done

exit 0