# Copyright (c) 2017, the ElectrumX authors
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# The MIT License (MIT)
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import json
import os
from binascii import unhexlify

import pytest

from electrumx.lib.coins import Coin
from electrumx.lib.hash import hex_str_to_hash
from electrumx.lib.util import subclasses

coin_classes_all = set([coin for coin in subclasses(Coin) if coin.NET == 'mainnet'])
coin_classes_tested = set()

BLOCKS_DIR = os.path.join(
    os.path.dirname(os.path.realpath(__file__)), 'blocks')

# Find testcases
blocks = []

for name in sorted(os.listdir(BLOCKS_DIR)):
    try:
        name_parts = name.split("_")
        coin = Coin.lookup_coin_class(name_parts[0], name_parts[1])
        if coin.NET == 'mainnet':
            coin_classes_tested.add(coin)
        with open(os.path.join(BLOCKS_DIR, name)) as f:
            blocks.append((coin, json.load(f)))
    except Exception:
        blocks.append(pytest.fail(name))


@pytest.fixture(params=blocks)
def block_details(request):
    return request.param


def test_block(block_details):
    coin, block_info = block_details

    raw_block = unhexlify(block_info['block'])
    block = coin.block(raw_block, block_info['height'])

    assert coin.header_hash_rev(block.header) == hex_str_to_hash(block_info['hash'])
    assert (coin.header_prevhash_rev(block.header)
            == hex_str_to_hash(block_info['previousblockhash']))
    assert len(block_info['tx']) == len(block.transactions)
    for n, tx in enumerate(block.transactions):
        assert tx.txid_rev == hex_str_to_hash(block_info['tx'][n])


def test_all_coins_are_covered():
    assert coin_classes_all - coin_classes_tested == set()