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#!/bin/bash
# Put this script in the folder that your Games_WHDLoad directory lives in. Dump update pack directories in the same place and run the script

export SETOPTS="${SETOPTS:--eux}"
set "${SETOPTS}"

export BASEDIR
BASEDIR="$(dirname "$0")"
export GAMESDIR="${BASEDIR}/Games_WHDLoad"

apply_update() {
    set "${SETOPTS}"
    UPDATEDIR="$(dirname "$1")"
    LETTERDIR="$(basename "${UPDATEDIR}")"
    GAME="$(basename "$1")"
    OLDGAME="${GAMESDIR}/${LETTERDIR}/${GAME}"

    echo "    ${GAME}:"

    if [ -d "${OLDGAME}" ]; then
        echo "      Removing previous version"
        rm -rf "${OLDGAME}"
        rm "${OLDGAME}.info"
    fi

    echo -n "      Copying..."
    rsync -qarx "${UPDATEDIR}/${GAME}" "${GAMESDIR}/${LETTERDIR}/"
    rsync -qarx "${UPDATEDIR}/${GAME}.info" "${GAMESDIR}/${LETTERDIR}/"
    echo "Done."

    echo -n "      Removing from update pack..."
    rm -rf "${UPDATEDIR:?}/${GAME}"
    rm "${UPDATEDIR}/${GAME}.info"
    echo "Done."
}

update_from_dir() {
    set "${SETOPTS}"
    UPDATEDIR="$1"

    echo "  Applying updates from ${UPDATEDIR}:"
    echo ""

    find "${UPDATEDIR}" -depth 1 -maxdepth 1 -type d -exec bash -c 'apply_update "$0"' {} \;
    rm -r "${UPDATEDIR}"

    echo ""
}

traverse_update_pack() {
    set "${SETOPTS}"
    PACK="$1"
    PACK_NAME="$(basename "${PACK}")"
    PACK_VERSION="${PACK_NAME:7:3}"

    echo "Examining update pack ${PACK_VERSION} for updates..."
    echo ""

    find "${PACK}" -depth 1 -maxdepth 1 -type d -name '?' -exec bash -c 'update_from_dir "$0"' {} \;
    rm -r "${PACK}"

    echo ""
    echo "${PACK_VERSION}" >>processed_updates.txt
}

export -f apply_update
export -f update_from_dir
export -f traverse_update_pack

find "${BASEDIR}" -maxdepth 1 -type d -name 'Update_*Games_WHDLoad' -exec bash -c 'traverse_update_pack "$0"' {} \;