#!/bin/bash

scripts_dir="$(dirname $(realpath "${BASH_SOURCE:-$0}"))"

clone_snaps () {
    local snap; local bsnap
    if ! sudo mkdir -p $TDIR/$TNAME &>/dev/null; then
      echo ERROR unable to make directory $TDIR/$TNAME
      return 1
    fi
    echo cloning transfered read only snapshots at $TSNAPS 
    ls -la $TSNAPS
    echo to $TDIR/$TNAME
    echo "################"     
    echo cdir: $CDIR, tname: $TNAME           
    latest=$(sudo btrbk -c "$CDIR/$TNAME.conf" list --format col:h:target_subvolume | xargs -I % sh -c 'basename %' | sed '$!N; /^\(.*\)\n\1$/!P; D')
    echo $latest
    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, nothing to clone
    fi
}

osxfer () { 

    local TDIR; local TSNAPS; local SDIR; local CDIR

    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}
        echo tsnaps: $TSNAPS
        # TODO make sure minimal environment is set
        source <(
            source $efile
            bash $(module_find btpl) $scripts_dir/os.conf.tmpl
        ) >$CDIR/$TNAME.conf
        # echo "######### btrbk file: $TNAME.conf ##############"
        echo "$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 ls $TSNAPS/@root.* &>/dev/null; then 
              echo exists
                if ! confirm a set of transfer snapshots exist at destination, resend?; then  
                    clone_snaps
                    return
                fi  
            fi
            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 "########################"
                clone_snaps 
            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

}