package main

import (
	"fmt"
	"os"
)

func main() {
	address := "0xbad1568bf8d55f5f808edec0cd7394ebd8d51d0e"
	fromBlock := 6974800
	toBlock := 6974900

	result := searchBlock(address, fromBlock, toBlock)
	if result < fromBlock || result > toBlock {
		fmt.Printf("error: result must be between %d and %d (actual: %d)\n", fromBlock, toBlock, result)
		os.Exit(1)
	}

	fmt.Printf("result = %d\n", result)
}

// Find the block where the balance of the given address changed.
func searchBlock(address string, fromBlock, toBlock int) int {
	// TODO
	return 0
}

// Return the balance of an address at a given block.
//
// Example with curl:
// curl -XPOST -H "Content-Type: application/json" https://goerli.infura.io/v3/1958344898c54b909598f1d0b8457805 \
//   -d '{"jsonrpc":"2.0","method":"eth_getBalance","params":["0xbad1568bf8d55f5f808edec0cd7394ebd8d51d0e", "0x6a6ec1"],"id":1}'
func getBalance(address string, blockId int) string {
	// TODO
	return "0"
}