#!/bin/sh

########################################################
# Parse Parameters

FROM_LEVEL=$1
TO_LEVEL=$2
HOST=$3

if [ -z "$HOST" ]
then
    HOST=localhost:8732
fi

if [ -z "$TO_LEVEL" ]
then
    SCRIPT_NAME=$(basename $0)
    echo "Usage: $SCRIPT_NAME <FROM_LEVEL> <TO_LEVEL> [HOST:PORT]"
    echo
    echo "This script gets the commit hash from the proof of work nonce"
    echo "of levels between FROM_LEVEL and TO_LEVEL."
    echo "It then counts the number of blocks per commit hash."
    echo
    echo "To get the current level, use:"
    echo
    echo "    curl -s http://$HOST/chains/main/blocks/head/header | jq .level"
    echo
    exit 1
fi

########################################################
# Gather Proof of Work Nonces

RAW_FILENAME=$(tempfile --prefix baker-version-stats-raw --suffix .txt)

for i in $(seq $FROM_LEVEL $TO_LEVEL)
do
#    echo "Fetching $i/$TO_LEVEL..."
    curl -s http://$HOST/chains/main/blocks/$i/header | jq .proof_of_work_nonce >> $RAW_FILENAME
done

########################################################
# Count Statistics

STATS_FILENAME=$(tempfile --prefix baker-version-stats --suffix .txt)
sort $RAW_FILENAME | cut -c 2-9 | uniq -c | sort -n > $STATS_FILENAME
rm -f $RAW_FILENAME

########################################################
# Display Statistics

while read LINE
do
    COUNT=$(echo $LINE | cut -d ' ' -f 1)
    COMMIT=$(echo $LINE | cut -d ' ' -f 2)
    COMMIT_INFO=$(PAGER=cat git log $COMMIT -1 --format=format:'%h %ci%d%n%s' 2> /dev/null)
    echo
    if [ -z "$COMMIT_INFO" ]
    then
        echo "$COMMIT (not a commit)"
    else
        echo "$COMMIT_INFO"
    fi
    echo "=> $COUNT blocks"
done < $STATS_FILENAME

rm -f $STATS_FILENAME