#!/bin/bash
scripts_dir="$(dirname $(realpath "${BASH_SOURCE:-$0}"))"

efile=$1.env
if [[ -f $efile ]]; then
    module_load confirm
    echo "####  sourcing $efile ########"
    source $efile
    TDIR=${TDIR:-/snapshots/transfer/target}
    TSNAPS=${TDIR:-/snapshots/transfer/target}/${TSNAPS:-tmp/tsnaps}
    SDIR=${SDIR:-/snapshots/transfer/source}
    CDIR=${CDIR:-/snapshots/conf}
    # TODO make sure minimal environment is set
    source <(
        source $efile
        bash $(module_find btpl) os.conf.tmpl
    ) >$CDIR/$TNAME.conf
    echo "######### btrbk file: $TNAME.conf ##############"
    cat "$CDIR/$TNAME.conf"
    echo "#######################"
    if ! confirm "conf file is ok?"; then exit; fi
    module_load btrbk btrfs
    mkdir -p $TDIR &>/dev/null
    mkdir -p $SDIR &>/dev/null
    echo $SDIR
    ls -la /snapshots/transfer
    [[ $TLABEL ]] && sudo mount -L $TLABEL $TDIR
    [[ $TUUID ]] && sudo mount --UUID=$TUUID $TDIR
    [[ $TDEV ]] && sudo mount /dev/$TDEV $TDIR
    if mountpoint $TDIR &>/dev/null; then
        sudo mkdir -p $TSNAPS
        echo able to mount $TLABEL $TUUID $TDEV at $TDIR... continuing transfer
        if btrbk_run $2 "$CDIR/$TNAME.conf"; then
            echo successful transfer from $SMP/$SNAME to $TLABEL $TUUID $TDEV - $TSNAPS
            sudo btrbk -c "$CDIR/$TNAME.conf" list latest
            echo "########################"
            if sudo mkdir -p $TDIR/$TNAME &>/dev/null; then
                echo cloning transfered read only snapshots at $TSNAPS
                ls -la $TSNAPS
                echo to $TDIR/$TNAME
                sudo btrbk -c "$CDIR/$TNAME.conf" list latest
                latest=$(sudo btrbk -c "$CDIR/$TNAME.conf" list latest --format col:h:snapshot_subvolume | xargs -I % sh -c 'basename %' | sed '$!N; /^\(.*\)\n\1$/!P; D')
                if [[ $latest ]]; then
                    for snap in $latest; do
                        # dests+=" $(btrbk -c $file list target  --format col:h:target_path)"
                        bsnap=$(basename "${snap%.*}")
                        echo cloning $TSNAPS/$snap to $TDIR/$TNAME/$bsnap
                        if [[ -d $TDIR/$TNAME/$bsnap ]]; then
                            echo snapshot $TDIR/$TNAME/$bsnap already exists you must manually remove it if you want to overwrite
                            echo "'sudo btrfs sub del $TDIR/$TNAME/$bsnap' or 'sudo btrfs sub del $TDIR/$TNAME/*'"
                        else
                            sudo btrfs sub snap $TSNAPS/$snap $TDIR/$TNAME/$bsnap
                            echo $TDIR/$TNAME/$bsnap
                            ls -la $TDIR/$TNAME/$bsnap
                        fi
                    done
                    echo $TDIR/$TNAME
                    ls -la $TDIR/$TNAME
                else
                    echo no transfered snapshots to clone
                fi
            else
                echo ERROR unable to make directory $TDIR/$TNAME
            fi
        else
            echo ERROR: snapshot transfer to $TLABEL $TUUID $TDEV - $TSNAPS failed
        fi
        echo deleting temporary transfer snapshots at $SDIR
        sudo btrfs sub del $SDIR/*
        sudo rm -rf $SDIR
        echo deleting temporary transfer snapshots at $TSNAPS
        sudo btrfs sub del $TSNAPS/*
        sudo rm -rf $TSNAPS
        echo unmounting $TDIR
        if sudo umount -R $TDIR; then
            if ! confirm "remove local mount directory $TDIR?"; then exit; fi
            sudo rm -f $TDIR
        else
            echo WARNING: not able to unmount $TDIR
        fi
    else
        echo unable to mount $TLABEL $TUUID $TDEV at $TDIR
    fi
else
    echo environment file $efile does not exisit
fi