#include <iostream>
#include <list>
#include <vector>
#include <ctime>

using namespace std;

string zeros = "00000000000000";

struct block {
	size_t id;
	string timestamp;
	string data;
	size_t nonce;
	size_t previous_hash;
};

void find_nonce (block &a_block, int difficulty){
	size_t hr = hash_combined(a_block);

	while (true){
		string hrs = to_string(hr);
		if (hrs.compare(hrs.size() - difficulty, difficulty, zeros, 0, difficulty) == 0 )
			break;
		a_block.nonce++;
		hr = hash_combined(a_block);
	}
}

void check_valid_blockchain (list <block>, &chain){


}

int main(){
	list <block> blockchain;
	int difficulty = 7;

	vector<string> texts = {"A pays B 10",
							"B pays C 20",
							"C pays D 30",
							};

	time_t now = time(0);

	struct tm *timeinfo = localtime(&now);
	char buffer[80];
	strftime(buffer, 80, "%F%T", timeinfo);
	block genesis_block = {0, buffer, "GENESIS BLOCK", 0, 0};
	find_nonce(genesis_block, difficulty);
	blockchain.push_back(genesis_block);

	block previous_block = genesis_block;

	for (int i=0; i < texts.size(); i++ ){
		block a_block;
		//now?
		now = time(0);
		timeinfo = localtime(&now);
		strftime(buffer, 80, "%F%T", timeinfo);
		a_block.timestamp = buffer;
		a_block.data = texts[i];
		a_block.previous_hash = hash_combined(previous_block);
		find_nonce(a_block, difficulty);
		blockchain.push_back(a_block);
		print_block(a_block);
	}
}