'use strict';

var _ = require('lodash');
var async = require('async');

var chai = require('chai');
var sinon = require('sinon');
var should = chai.should();
var log = require('npmlog');
log.debug = log.verbose;
var tingodb = require('tingodb')({
  memStore: true
});

var Bitcore = require('bitcore-lib');
var Bitcore_ = {
  btc: Bitcore,
  bch: require('bitcore-lib-cash')
};

var Common = require('../../lib/common');
var Utils = Common.Utils;
var Constants = Common.Constants;
var Defaults = Common.Defaults;

var Storage = require('../../lib/storage');
var Model = require('../../lib/model');
var WalletService = require('../../lib/server');
var TestData = require('../testdata');

var storage, blockchainExplorer;

var useMongoDb = !!process.env.USE_MONGO_DB;

var helpers = {};

helpers.CLIENT_VERSION = 'bwc-2.0.0';

helpers.before = function(cb) {
  function getDb(cb) {
    if (useMongoDb) {
      var mongodb = require('mongodb');
      mongodb.MongoClient.connect('mongodb://localhost:27017/bws_test', function(err, db) {
        if (err) throw err;
        return cb(db);
      });
    } else {
      var db = new tingodb.Db('./db/test', {});
      return cb(db);
    }
  }
  getDb(function(db) {
    storage = new Storage({
      db: db
    });
    return cb();
  });
};

helpers.beforeEach = function(cb) {
  if (!storage.db) return cb();
  storage.db.dropDatabase(function(err) {
    if (err) return cb(err);
    blockchainExplorer = sinon.stub();
    var opts = {
      storage: storage,
      blockchainExplorer: blockchainExplorer,
      request: sinon.stub()
    };
    WalletService.initialize(opts, function() {
      return cb(opts);
    });
  });
};

helpers.after = function(cb) {
  WalletService.shutDown(cb);
};

helpers.getBlockchainExplorer = function() {
  return blockchainExplorer;
};

helpers.getStorage = function() {
  return storage;
};

helpers.signMessage = function(text, privKey) {
  var priv = new Bitcore.PrivateKey(privKey);
  var hash = Utils.hashMessage(text);
  return Bitcore.crypto.ECDSA.sign(hash, priv, 'little').toString();
};

helpers.signRequestPubKey = function(requestPubKey, xPrivKey) {
  var priv = new Bitcore.HDPrivateKey(xPrivKey).deriveChild(Constants.PATHS.REQUEST_KEY_AUTH).privateKey;
  return helpers.signMessage(requestPubKey, priv);
};

helpers.getAuthServer = function(copayerId, cb) {
  var verifyStub = sinon.stub(WalletService.prototype, '_verifySignature');
  verifyStub.returns(true);

  WalletService.getInstanceWithAuth({
    copayerId: copayerId,
    message: 'dummy',
    signature: 'dummy',
    clientVersion: helpers.CLIENT_VERSION,
  }, function(err, server) {
    verifyStub.restore();
    if (err || !server) throw new Error('Could not login as copayerId ' + copayerId + ' err: ' + err);
    return cb(server);
  });
};

helpers._generateCopayersTestData = function() {
  var xPrivKeys = ['xprv9s21ZrQH143K2n4rV4AtAJFptEmd1tNMKCcSyQBCSuN5eq1dCUhcv6KQJS49joRxu8NNdFxy8yuwTtzCPNYUZvVGC7EPRm2st2cvE7oyTbB',
    'xprv9s21ZrQH143K3BwkLceWNLUsgES15JoZuv8BZfnmDRcCGtDooUAPhY8KovhCWcRLXUun5AYL5vVtUNRrmPEibtfk9ongxAGLXZzEHifpvwZ',
    'xprv9s21ZrQH143K3xgLzxd6SuWqG5Zp1iUmyGgSsJVhdQNeTzAqBFvXXLZqZzFZqocTx4HD9vUVYU27At5i8q46LmBXXL97fo4H9C3tHm4BnjY',
    'xprv9s21ZrQH143K48nfuK14gKJtML7eQzV2dAH1RaqAMj8v2zs79uaavA9UTWMxpBdgbMH2mhJLeKGq8AFA6GDnFyWP4rLmknqZAfgFFV718vo',
    'xprv9s21ZrQH143K44Bb9G3EVNmLfAUKjTBAA2YtKxF4zc8SLV1o15JBoddhGHE9PGLXePMbEsSjCCvTvP3fUv6yMXZrnHigBboRBn2DmNoJkJg',
    'xprv9s21ZrQH143K48PpVxrh71KdViTFhAaiDSVtNFkmbWNYjwwwPbTrcqoVXsgBfue3Gq9b71hQeEbk67JgtTBcpYgKLF8pTwVnGz56f1BaCYt',
    'xprv9s21ZrQH143K3pgRcRBRnmcxNkNNLmJrpneMkEXY6o5TWBuJLMfdRpAWdb2cG3yxbL4DxfpUnQpjfQUmwPdVrRGoDJmtAf5u8cyqKCoDV97',
    'xprv9s21ZrQH143K3nvcmdjDDDZbDJHpfWZCUiunwraZdcamYcafHvUnZfV51fivH9FPyfo12NyKH5JDxGLsQePyWKtTiJx3pkEaiwxsMLkVapp',
    'xprv9s21ZrQH143K2uYgqtYtphEQkFAgiWSqahFUWjgCdKykJagiNDz6Lf7xRVQdtZ7MvkhX9V3pEcK3xTAWZ6Y6ecJqrXnCpzrH9GSHn8wyrT5',
    'xprv9s21ZrQH143K2wcRMP75tAEL5JnUx4xU2AbUBQzVVUDP7DHZJkjF3kaRE7tcnPLLLL9PGjYTWTJmCQPaQ4GGzgWEUFJ6snwJG9YnQHBFRNR'
  ];

  console.log('var copayers = [');
  _.each(xPrivKeys, function(xPrivKeyStr, c) {
    var xpriv = Bitcore.HDPrivateKey(xPrivKeyStr);
    var xpub = Bitcore.HDPublicKey(xpriv);

    var xpriv_45H = xpriv.deriveChild(45, true);
    var xpub_45H = Bitcore.HDPublicKey(xpriv_45H);
    var id45 = Model.Copayer._xPubToCopayerId('btc', xpub_45H.toString());

    var xpriv_44H_0H_0H = xpriv.deriveChild(44, true).deriveChild(0, true).deriveChild(0, true);
    var xpub_44H_0H_0H = Bitcore.HDPublicKey(xpriv_44H_0H_0H);
    var id44btc = Model.Copayer._xPubToCopayerId('btc', xpub_44H_0H_0H.toString());
    var id44bch = Model.Copayer._xPubToCopayerId('bch', xpub_44H_0H_0H.toString());

    var xpriv_1H = xpriv.deriveChild(1, true);
    var xpub_1H = Bitcore.HDPublicKey(xpriv_1H);
    var priv = xpriv_1H.deriveChild(0).privateKey;
    var pub = xpub_1H.deriveChild(0).publicKey;

    console.log('{id44btc: ', "'" + id44btc + "',");
    console.log('id44bch: ', "'" + id44bch + "',");
    console.log('id45: ', "'" + id45 + "',");
    console.log('xPrivKey: ', "'" + xpriv.toString() + "',");
    console.log('xPubKey: ', "'" + xpub.toString() + "',");
    console.log('xPrivKey_45H: ', "'" + xpriv_45H.toString() + "',");
    console.log('xPubKey_45H: ', "'" + xpub_45H.toString() + "',");
    console.log('xPrivKey_44H_0H_0H: ', "'" + xpriv_44H_0H_0H.toString() + "',");
    console.log('xPubKey_44H_0H_0H: ', "'" + xpub_44H_0H_0H.toString() + "',");
    console.log('xPrivKey_1H: ', "'" + xpriv_1H.toString() + "',");
    console.log('xPubKey_1H: ', "'" + xpub_1H.toString() + "',");
    console.log('privKey_1H_0: ', "'" + priv.toString() + "',");
    console.log('pubKey_1H_0: ', "'" + pub.toString() + "'},");
  });
  console.log('];');
};

helpers.getSignedCopayerOpts = function(opts) {
  var hash = WalletService._getCopayerHash(opts.name, opts.xPubKey, opts.requestPubKey);
  opts.copayerSignature = helpers.signMessage(hash, TestData.keyPair.priv);
  return opts;
};

helpers.createAndJoinWallet = function(m, n, opts, cb) {
  if (_.isFunction(opts)) {
    cb = opts;
    opts = {};
  }
  opts = opts || {};

  var server = new WalletService();
  var copayerIds = [];
  var offset = opts.offset || 0;

  var walletOpts = {
    name: 'a wallet',
    m: m,
    n: n,
    pubKey: TestData.keyPair.pub,
    singleAddress: !!opts.singleAddress,
    coin: opts.coin || 'btc',
  };
  if (_.isBoolean(opts.supportBIP44AndP2PKH))
    walletOpts.supportBIP44AndP2PKH = opts.supportBIP44AndP2PKH;

  server.createWallet(walletOpts, function(err, walletId) {
    if (err) return cb(err);

    async.each(_.range(n), function(i, cb) {
      var copayerData = TestData.copayers[i + offset];
      var copayerOpts = helpers.getSignedCopayerOpts({
        walletId: walletId,
        coin: opts.coin,
        name: 'copayer ' + (i + 1),
        xPubKey: (_.isBoolean(opts.supportBIP44AndP2PKH) && !opts.supportBIP44AndP2PKH) ? copayerData.xPubKey_45H : copayerData.xPubKey_44H_0H_0H,
        requestPubKey: copayerData.pubKey_1H_0,
        customData: 'custom data ' + (i + 1),
      });
      if (_.isBoolean(opts.supportBIP44AndP2PKH))
        copayerOpts.supportBIP44AndP2PKH = opts.supportBIP44AndP2PKH;

      server.joinWallet(copayerOpts, function(err, result) {
        should.not.exist(err);
        copayerIds.push(result.copayerId);
        return cb(err);
      });
    }, function(err) {
      if (err) return new Error('Could not generate wallet');
      helpers.getAuthServer(copayerIds[0], function(s) {
        s.getWallet({}, function(err, w) {
          cb(s, w);
        });
      });
    });
  });
};


helpers.randomTXID = function() {
  return Bitcore.crypto.Hash.sha256(new Buffer(Math.random() * 100000)).toString('hex');;
};

helpers.toSatoshi = function(btc) {
  if (_.isArray(btc)) {
    return _.map(btc, helpers.toSatoshi);
  } else {
    return Utils.strip(btc * 1e8);
  }
};

helpers._parseAmount = function(str) {
  var result = {
    amount: +0,
    confirmations: _.random(6, 100),
  };

  if (_.isNumber(str)) str = str.toString();

  var re = /^((?:\d+c)|u)?\s*([\d\.]+)\s*(btc|bit|sat)?$/;
  var match = str.match(re);

  if (!match) throw new Error('Could not parse amount ' + str);

  if (match[1]) {
    if (match[1] == 'u') result.confirmations = 0;
    if (_.endsWith(match[1], 'c')) result.confirmations = +match[1].slice(0, -1);
  }

  switch (match[3]) {
    default:
    case 'btc':
      result.amount = Utils.strip(+match[2] * 1e8);
      break;
    case 'bit':
      result.amount = Utils.strip(+match[2] * 1e2);
      break
    case 'sat':
      result.amount = Utils.strip(+match[2]);
      break;
  };

  return result;
};

helpers.stubUtxos = function(server, wallet, amounts, opts, cb) {
  if (_.isFunction(opts)) {
    cb = opts;
    opts = {};
  }
  opts = opts || {};

  if (!helpers._utxos) helpers._utxos = {};

  var S = Bitcore_[wallet.coin].Script;

  async.waterfall([

    function(next) {
      if (opts.addresses) return next(null, [].concat(opts.addresses));
      async.mapSeries(_.range(0, amounts.length > 2 ? 2 : 1), function(i, next) {
        server.createAddress({}, next);
      }, next);
    },
    function(addresses, next) {
      addresses.should.not.be.empty;

      var utxos = _.compact(_.map([].concat(amounts), function(amount, i) {
        var parsed = helpers._parseAmount(amount);

        if (parsed.amount <= 0) return null;

        var address = addresses[i % addresses.length];

        var scriptPubKey;
        switch (wallet.addressType) {
          case Constants.SCRIPT_TYPES.P2SH:
            scriptPubKey = S.buildMultisigOut(address.publicKeys, wallet.m).toScriptHashOut();
            break;
          case Constants.SCRIPT_TYPES.P2PKH:
            scriptPubKey = S.buildPublicKeyHashOut(address.address);
            break;
        }
        should.exist(scriptPubKey);

        return {
          txid: helpers.randomTXID(),
          vout: _.random(0, 10),
          satoshis: parsed.amount,
          scriptPubKey: scriptPubKey.toBuffer().toString('hex'),
          address: address.address,
          confirmations: parsed.confirmations,
          publicKeys: address.publicKeys,
        };
      }));

      if (opts.keepUtxos) {
        helpers._utxos = helpers._utxos.concat(utxos);
      } else {
        helpers._utxos = utxos;
      }

      blockchainExplorer.getUtxos = function(addresses, cb) {
        var selected = _.filter(helpers._utxos, function(utxo) {
          return _.contains(addresses, utxo.address);
        });
        return cb(null, selected);
      };

      return next();
    },
  ], function(err) {
    should.not.exist(err);
    return cb(helpers._utxos);
  });
};

helpers.stubBroadcast = function(thirdPartyBroadcast) {
  blockchainExplorer.broadcast = sinon.stub().callsArgWith(1, null, '112233');
  blockchainExplorer.getTransaction = sinon.stub().callsArgWith(1, null, null);
};

helpers.stubHistory = function(txs) {
  var totalItems = txs.length;
  blockchainExplorer.getTransactions = function(addresses, from, to, cb) {
    var MAX_BATCH_SIZE = 100;
    var nbTxs = txs.length;

    if (_.isUndefined(from) && _.isUndefined(to)) {
      from = 0;
      to = MAX_BATCH_SIZE;
    }
    if (!_.isUndefined(from) && _.isUndefined(to))
      to = from + MAX_BATCH_SIZE;

    if (!_.isUndefined(from) && !_.isUndefined(to) && to - from > MAX_BATCH_SIZE)
      to = from + MAX_BATCH_SIZE;

    if (from < 0) from = 0;
    if (to < 0) to = 0;
    if (from > nbTxs) from = nbTxs;
    if (to > nbTxs) to = nbTxs;

    var page = txs.slice(from, to);
    return cb(null, page, totalItems);
  };
};

helpers.stubFeeLevels = function(levels) {
  blockchainExplorer.estimateFee = function(nbBlocks, cb) {
    var result = _.zipObject(_.map(_.pick(levels, nbBlocks), function(fee, n) {
      return [+n, fee > 0 ? fee / 1e8 : fee];
    }));
    return cb(null, result);
  };
};

helpers.stubAddressActivity = function(activeAddresses) {
  blockchainExplorer.getAddressActivity = function(address, cb) {
    return cb(null, _.contains(activeAddresses, address));
  };
};

helpers.clientSign = function(txp, derivedXPrivKey) {
  var self = this;

  //Derive proper key to sign, for each input
  var privs = [];
  var derived = {};

  var xpriv = new Bitcore.HDPrivateKey(derivedXPrivKey, txp.network);

  _.each(txp.inputs, function(i) {
    if (!derived[i.path]) {
      derived[i.path] = xpriv.deriveChild(i.path).privateKey;
      privs.push(derived[i.path]);
    }
  });

  var t = txp.getBitcoreTx();

  var signatures = _.map(privs, function(priv, i) {
    return t.getSignatures(priv);
  });

  signatures = _.map(_.sortBy(_.flatten(signatures), 'inputIndex'), function(s) {
    return s.signature.toDER().toString('hex');
  });

  return signatures;
};

helpers.getProposalSignatureOpts = function(txp, signingKey) {
  var raw = txp.getRawTx();
  var proposalSignature = helpers.signMessage(raw, signingKey);

  return {
    txProposalId: txp.id,
    proposalSignature: proposalSignature,
  }
};


helpers.createAddresses = function(server, wallet, main, change, cb) {
  // var clock = sinon.useFakeTimers('Date');
  async.mapSeries(_.range(main + change), function(i, next) {
    // clock.tick(1000);
    var address = wallet.createAddress(i >= main);
    server.storage.storeAddressAndWallet(wallet, address, function(err) {
      next(err, address);
    });
  }, function(err, addresses) {
    should.not.exist(err);
    // clock.restore();
    return cb(_.take(addresses, main), _.takeRight(addresses, change));
  });
};

helpers.createAndPublishTx = function(server, txOpts, signingKey, cb) {
  server.createTx(txOpts, function(err, txp) {
    should.not.exist(err);
    var publishOpts = helpers.getProposalSignatureOpts(txp, signingKey);
    server.publishTx(publishOpts, function(err) {
      should.not.exist(err);
      return cb(txp);
    });
  });
};


helpers.historyCacheTest = function(items) {
  var template = {
    txid: "fad88682ccd2ff34cac6f7355fe9ecd8addd9ef167e3788455972010e0d9d0de",
    vin: [{
      txid: "0279ef7b21630f859deb723e28beac9e7011660bd1346c2da40321d2f7e34f04",
      vout: 0,
      n: 0,
      addr: "2NAVFnsHqy5JvqDJydbHPx393LFqFFBQ89V",
      valueSat: 45753,
      value: 0.00045753,
    }],
    vout: [{
      value: "0.00011454",
      n: 0,
      scriptPubKey: {
        addresses: [
          "2N7GT7XaN637eBFMmeczton2aZz5rfRdZso"
        ]
      }
    }, {
      value: "0.00020000",
      n: 1,
      scriptPubKey: {
        addresses: [
          "mq4D3Va5mYHohMEHrgHNGzCjKhBKvuEhPE"
        ]
      }
    }],
    confirmations: 1,
    blockheight: 423499,
    time: 1424472242,
    blocktime: 1424472242,
    valueOut: 0.00031454,
    valueIn: 0.00045753,
    fees: 0.00014299
  };

  var ret = [];
  _.each(_.range(0, items), function(i) {
    var t = _.clone(template);
    t.txid = 'txid:' + i;
    t.confirmations = items - i - 1;
    t.blockheight = i;
    t.time = t.blocktime = i;
    ret.unshift(t);
  });

  return ret;
};

module.exports = helpers;