#!/bin/bash
cd $AK_MINEDBLOCKSDIR
PROGRAM="$(basename $0)"
declare -A counters
source $AK_LIBDIR/_ak_log
source $AK_LIBDIR/_ak_ipfs

if [ ! -z $1 ] && [ -n "$1" ]
then
    if [ "$1" == "-h" ] || [ "$1" == "--help" ]
    then
        echo "$PROGRAM - Finds longest schain from the $AK_MINEDBLOCKSDIR dir">&2
        exit 2
    fi
fi

further(){
    # _ak_log_info "Diving into $1"
    lookfor $1
}

lookfor(){
    echo -n $1 | grep -e '[0-9a-f]\{128\}' > /dev/null
    if [ $? -ne 0 ]
    then
        _ak_log_error "Oops!!! The argument passed, does not match the regular expression!"
    else
        counters[$CHAIN_PARENT]="$(expr ${counters[$CHAIN_PARENT]} + 1)"
        if [ $? -ne 0 ]
        then
            echo "$1, $counters[$1]"
            exit 1
        fi
        _ak_log_info "Accessing file: $1"
    #    echo "$1 file:"
    #    cat "$1" | jq
        NEXT_TARGET="$(cat "$1" | jq | grep previous | tr -d ' ' | sed -e 's/previous//g; s/[",:]//g;')"
        if [ -n "$NEXT_TARGET" ]
        then
            _ak_log_info "Found previous: $NEXT_TARGET"
            if [ ! -f "$NEXT_TARGET" ]
            then
                _ak_log_warning "Could not find $NEXT_TARGET"
            else
                further "$NEXT_TARGET"
            fi
        else
            _ak_log_warning "No next target found. So long for $1"
        fi
    fi
}

templistblock="$(mktemp)"
find . -type f | sed 's/^\.\/000/000/g' | grep '^000'  | sort > $templistblock
while IFS="" read -r p || [ -n "$p" ]
do
#    if [ ! "$p" = "" ] && [ ! "$p" = "tmplistblock" ]
    if [ "$(echo $p | tr -d '\n' | wc -c)" = 128 ]
    then
        filename="$(basename $p)"
        _ak_log_info "Investigating $filename..."
        export CHAIN_PARENT="$filename"
        counters[$CHAIN_PARENT]=1
        lookfor "$filename"
    else
        _ak_log_warning "Nothing to do with $filename"
    fi
done < $templistblock
rm $templistblock
max=0
max_holder=0
for value in "${!counters[@]}"
do
    #    echo "${value} : ${counters[${value}]}"
    if [ ${counters[${value}]} -gt $max  ]
    then
        max="${counters[${value}]}"
        max_holder="${value}"
        _ak_log_info "New MAX $max on $max_holder"
    fi
done
echo '{"latest_block":"'$max_holder'"}'