package com.company;

import java.io.File;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;


import org.bitcoinj.core.*;
import org.bitcoinj.params.MainNetParams;
import org.bitcoinj.utils.BlockFileLoader;


public class BitcoinReader{

    //This is the path where my blk*.dats can be found
    static String PATH = "d:/bitcoin_blockchain/blocks/";

    public void read() {

        // Just some initial setup
        NetworkParameters np = new MainNetParams();
        Context.getOrCreate(MainNetParams.get());

        // We create a BlockFileLoader object by passing a list of files.
        // The list of files is built with the method buildList(), see
        // below for its definition.
        BlockFileLoader loader = new BlockFileLoader(np,buildList());

        int blockCounter = 0;

        try{
            for (Block block : loader) {

                blockCounter++;
                // There you can see the progress
                System.out.println("Block #"+blockCounter);

                //i get the exception after this block #481815
                if(blockCounter == 481815){
                    System.out.println("Debugging");
                }
            }
        } catch (Exception e){
            e.printStackTrace();
        }

    }


    // The method returns a list of files in a directory according to a certain
    // pattern (block files have name blkNNNNN.dat)
    private List<File> buildList() {
        List<File> list = new LinkedList<File>();
        for (int i = 0; true; i++) {
            File file = new File(PATH + String.format(Locale.US, "blk%05d.dat", i));
            if (!file.exists())
                break;
            list.add(file);
        }
        return list;
    }


    // Main method: simply invoke everything
    public static void main(String[] args) {
        BitcoinReader br = new BitcoinReader();
        br.read();
    }

}