Calculate upgrade height

#!/bin/bash

# https://gist.github.com/assafmo/01d7ee0d131a99518d2a4189a9250460

BLOCK_WINDOW="${1}" # e.g. 100000 blocks in the past
UPGRADE_TIME="${2}" # e.g. 2023-03-02T19:07:13Z
LCD="${3}"          # e.g. https://lcd.secret.express or https://api.pulsar.scrttestnet.com

LATEST="$(curl -s "$LCD/cosmos/base/tendermint/v1beta1/blocks/latest")"

echo "$LATEST" | jq -r .block.header.chain_id

LATEST_HEIGHT="$(echo "${LATEST}" | jq -r .block.header.height)"
LATEST_TIME="$(echo "${LATEST}" | jq -r .block.header.time)"

PAST_HEIGHT="$(node -p "${LATEST_HEIGHT} - ${BLOCK_WINDOW}")"

PAST="$(curl -s "$LCD/cosmos/base/tendermint/v1beta1/blocks/${PAST_HEIGHT}")"
PAST_TIME="$(echo "${PAST}" | jq -r .block.header.time)"

BLOCK_TIME=$(node -p "(new Date('${LATEST_TIME}').getTime() - new Date('${PAST_TIME}').getTime()) / 1000 / ${BLOCK_WINDOW}")

node -p "Math.floor((new Date('${UPGRADE_TIME}').getTime()-Date.now())/1000/${BLOCK_TIME} + ${LATEST_HEIGHT})"