#!/usr/bin/env bash
##
## You can mine sblocks for schain
##
## Usage:
##
##    -h, --help                  Prints this help message
##    --mine                      Starts mining for SCHAIN
##
fullprogrampath="$(realpath $0)"
PROGRAM=$(basename $0)
descriptionString="Sblock mining"

source $AK_LIBDIR/_ak_log
source $AK_LIBDIR/_ak_script

gather_zblocks(){
    if [ "$(cat $AK_ZBLOCKSFILE | jq -r '.[].zblock' | wc -l)" -ne 0 ]
    then
        cat $AK_ZBLOCKSFILE | \
            jq | \
            grep -e 'Qm.\{44\}' | \
            sed -e 's/\"zblock\"://g; s/ //g;' | \
            tr -d '\n'| \
            sed -e 's/""/","/g;
                s/^/[&/g; s/$/&]/g;
                s/^/{"zblocks":&/;
                s/$/&,/g'
    else
        echo -ne '{'
    fi
}

proofofwork(){
    TEST="$(gather_zblocks)"
    MINER="$(ak-gpg --get-key-self-as-ipfs)"
    PRE="$(ak-schain --get-latest | jq -r '.latest_block' | tr -d $'\n')"
    i=1
    l=1; while [ $l = 1 ]
    do
        TIMESTAMP="$(date -u +%s)"
        SHA="$(echo -n $TEST'"nonce":"'$i'","previous":"'$PRE'","timestamp":"'$TIMESTAMP'","miner":"'$MINER'","reward":"40"}' | sha512sum | awk '{ print $1 }')"
        # Static difficulty for securing the sblock
        echo $SHA | grep -e '^000'
        if [ $? -eq 0 ]
        then
            echo "SHA512 is $SHA"
            echo "Mined block:"
            echo -n $TEST'"nonce":"'$i'","previous":"'$PRE'","timestamp":"'$TIMESTAMP'","miner":"'$MINER'","reward":"40"}' | jq --compact-output > $AK_MINEDBLOCKSDIR/$SHA
            cat $AK_MINEDBLOCKSDIR/$SHA | jq
            # exit 0
            # Instead of exiting, we will now sleep for 60 seconds
            # after that we continue mining on top of the just mined
            # block.
            sleep 10
            proofofwork
        fi
        i=$(expr $i + 1);
    done
}





# Flags to run
if [ ! -z $1 ]
then
    case $1 in
        -h | --help) _ak_usage; exit;;
        --example) example; exit;;
        --mine) proofofwork; exit;;
        * ) _ak_usage;;
    esac
else _ak_usage
fi