using BitcoinBlockchain.Data;
using BitcoinBlockchain.Parser;

var blockchainFilePath = @"C:\Users\feie9454\source\repos\BSVTest\BSVTest\blk00000.dat";

if (!File.Exists(blockchainFilePath))
{
	Console.Error.WriteLine($"找不到区块文件: {blockchainFilePath}");
	return;
}

var blockchainDirectory = Path.GetDirectoryName(blockchainFilePath);
var firstBlockchainFileName = Path.GetFileName(blockchainFilePath);

if (string.IsNullOrWhiteSpace(blockchainDirectory))
{
	Console.Error.WriteLine("无法确定区块文件所在目录。");
	return;
}

IBlockchainParser blockchainParser = new BlockchainParser(blockchainDirectory, firstBlockchainFileName, 1);

var blockCount = 0;
var transactionCount = 0;
var transactionInputCount = 0;
var transactionOutputCount = 0;
ulong movedSatoshis = 0;
var blocks = new List<ParserBlock>();

foreach (ParserBlock block in blockchainParser.ParseBlockchain())
{
	blocks.Add(block);
	blockCount++;
	transactionCount += block.Transactions.Count;

	foreach (var transaction in block.Transactions)
	{
		transactionInputCount += transaction.Inputs.Count;
		transactionOutputCount += transaction.Outputs.Count;

		foreach (var transactionOutput in transaction.Outputs)
		{
			movedSatoshis += (ulong)transactionOutput.Value.Satoshi;
		}
	}
}

var blocksByHash = blocks.ToDictionary(block => block.GetHash().ToString(), StringComparer.OrdinalIgnoreCase);
var chainLengthCache = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);

var longestChainLength = 0;
ParserBlock? longestChainTip = null;

foreach (var block in blocks)
{
	var currentLength = GetChainLength(block);
	if (currentLength > longestChainLength)
	{
		longestChainLength = currentLength;
		longestChainTip = block;
	}
}

string? longestChainStartHash = null;
string? longestChainEndHash = longestChainTip?.GetHash().ToString();

if (longestChainTip is not null)
{
	var current = longestChainTip;
	while (true)
	{
		longestChainStartHash = current.GetHash().ToString();
		var previousHash = current.Header.HashPrevBlock.ToString();
		if (!blocksByHash.TryGetValue(previousHash, out var parentBlock))
		{
			break;
		}

		current = parentBlock;
	}
}

Console.WriteLine($"区块数: {blockCount}");
Console.WriteLine($"交易数: {transactionCount}");
Console.WriteLine($"交易输入数: {transactionInputCount}");
Console.WriteLine($"交易输出数: {transactionOutputCount}");
Console.WriteLine($"所有交易输出累计: {movedSatoshis} sat");
Console.WriteLine($"最长链片段长度: {longestChainLength}");

if (longestChainStartHash is not null && longestChainEndHash is not null)
{
	Console.WriteLine($"最长链片段起点块哈希: {longestChainStartHash}");
	Console.WriteLine($"最长链片段终点块哈希: {longestChainEndHash}");
}

int GetChainLength(ParserBlock block)
{
	var blockHash = block.GetHash().ToString();
	if (chainLengthCache.TryGetValue(blockHash, out var cachedLength))
	{
		return cachedLength;
	}

	var previousHash = block.Header.HashPrevBlock.ToString();
	var currentLength = 1;

	if (blocksByHash.TryGetValue(previousHash, out var parentBlock))
	{
		currentLength += GetChainLength(parentBlock);
	}

	chainLengthCache[blockHash] = currentLength;
	return currentLength;
}