#!/usr/bin/env bash

set -euo pipefail

# Reads stdin or the file $1, looks lines up as hashes, then outputs block info
# for each hash. Uses the zcash-cli command for block lookups.

ZCASH_CLI="${ZCASH_CLI:-zcash-cli}"

while read hash; do
    header=$($ZCASH_CLI getblockheader "$hash" 2>&1 || true)

    if echo "$header" | jq . > /dev/null 2> /dev/null; then
        high=$(echo "$header" | jq -r '"\(.height)"')
        time=$(echo "$header" | jq -r '"\(.time|todate)"')
        prev=$(echo "$header" | jq -r '"\(.previousblockhash)"')
        next=$(echo "$header" | jq -r '"\(.nextblockhash)"')

        printf 'high: %s\ntime: %s\nhash: %s\nprev: %s\nnext: %s\n' \
               "$high" "$time" "$hash" "$prev" "$next"
    else
        # Handle lookup errors
        printf 'hash: %s\n%s\n' \
               "$hash" "$header"
    fi
done < "${1:-/dev/stdin}"