'use strict';

var sinon = require('sinon');
var should = require('chai').should();
var events = require('events');
var Promise = require('bluebird');

var bitcore = require('bitcore');

var AddressService = require('../../lib/services/address');

describe('AddressService', function() {

  var database, rpc, blockService, transactionService, service;

  function initialize() {
    database = {};
    rpc = {};
    blockService = {};
    transactionService = {};
    service = new AddressService({
      database: database,
      transactionService: transactionService,
      blockService: blockService,
      rpc: rpc
    });
  }

  it('initializes correctly', function() {
    initialize();
    should.exist(service);
  });

  var thenCaller = {
    then: function(arg) {
      return arg();
    }
  };

  describe('getSummary', function() {

    beforeEach(initialize);

    it('calls internal functions as expected', function(done) {
      service.blockService = {
        getLatest: sinon.mock()
      };
      service.getAllOutputs = sinon.mock();
      service.getSpent = sinon.mock();
      service.buildAddressSummary = sinon.mock();

      service.blockService.getLatest.onFirstCall().returns(thenCaller);
      service.getAllOutputs.onFirstCall().returns(thenCaller);
      service.getSpent.onFirstCall().returns(thenCaller);
      service.buildAddressSummary.onFirstCall().returns(thenCaller);

      var address = 'address';
      var confirmations = 100;
      var promise = service.getSummary(address, confirmations);
      promise.then(function() {

        service.blockService.getLatest.calledOnce.should.equal(true);
        service.getAllOutputs.calledOnce.should.equal(true);
        service.getSpent.calledOnce.should.equal(true);
        service.buildAddressSummary.calledOnce.should.equal(true);

        done();
      });
    });

    it('processOutput works as expected', function() {
      AddressService.processOutput({
        key: 'txas-A-B-C',
        value: '{"a": "b"}'
      }).should.deep.equal({
        address: 'A',
        txId: 'B',
        outputIndex: 'C',
        a: 'b'
      });
    });

    it('getAllOutputs rejects promise on error', function(done) {
      var dataCall = new events.EventEmitter();
      var address = '12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S';
      service.database.createReadStream = sinon.mock();
      service.database.createReadStream.onFirstCall().returns(dataCall);
      service.getAllOutputs(address).catch(done);
      dataCall.emit('error');
    });

    it('getSpent rejects promise on error', function(done) {
      var address = '12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S';
      var dataCall = new events.EventEmitter();
      service.database.createReadStream = sinon.mock();
      service.database.createReadStream.onFirstCall().returns(dataCall);
      service.getSpent(address).catch(done);
      dataCall.emit('error');
    });

    it('getAllOutputs calls the expected functions', function(done) {
      service.database.createReadStream = sinon.mock();
      var dataCall = new events.EventEmitter();
      service.database.createReadStream.onFirstCall().returns(dataCall);

      AddressService.processOutput = sinon.stub(AddressService, 'processOutput');
      AddressService.processOutput.onFirstCall().returns('processed');

      var element = {
        key: 'key',
        value: 'value'
      };
      var address = '12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S';
      service.getAllOutputs(address).then(function(arg) {
        service.database.createReadStream.firstCall.args[0].should.deep.equal({
          gte: 'txa-12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S-' + '0000000000000000000000000000000000000000000000000000000000000000-0',
          lte: 'txa-12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S-' + 'ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff-4294967295'
        });
        AddressService.processOutput.firstCall.args[0].should.equal(element);
        AddressService.processOutput.reset();
        arg[0].should.equal('processed');
        done();
      });

      dataCall.emit('data', element);
      dataCall.emit('end');
    });

    it('getSpent calls the expected functions', function(done) {
      service.database.createReadStream = sinon.mock();
      var dataCall = new events.EventEmitter();
      service.database.createReadStream.onFirstCall().returns(dataCall);

      var element = {
        key: 'key',
        value: JSON.stringify({
          a: 'b'
        })
      };
      var address = '12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S';
      service.getSpent(address)
        .then(function(arg) {
          service.database.createReadStream.firstCall.args[0].should.deep.equal({
            gte: 'txas-12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S-' + '0000000000000000000000000000000000000000000000000000000000000000-0',
            lte: 'txas-12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S-' + 'ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff-4294967295'
          });
          console.log(arguments);
          arg[0].should.deep.equal('processed');
          done();
        });

      dataCall.emit('data', element);
      dataCall.emit('end');
    });
  });

  describe('buildAddressSummary', function() {

    beforeEach(initialize);
    var address = new bitcore.Address('12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S');
    var tip = {
      height: 10
    };
    var allOutputs = [{
      satoshis: 10,
      txId: 'A',
      outputIndex: 1,
      heightConfirmed: 1
    }];

    it('calculates balance correctly for confirmed balance', function() {
      var allOutputs = [{
        satoshis: 10,
        txId: 'A',
        outputIndex: 1,
        heightConfirmed: 1
      }];
      var spendOutputs = [];

      service.buildAddressSummary(address, tip, allOutputs, spendOutputs).should.deep.equal({
        address: address.toString(),
        transactions: ['A'],
        confirmed: {
          balance: 10,
          sent: 0,
          received: 10
        },
        unconfirmed: {
          balance: 10,
          sent: 0,
          received: 10
        }
      });
    });

    it('calculates balance correctly for unconfirmed balance', function() {
      var allOutputs = [{
        satoshis: 20,
        txId: 'B',
        outputIndex: 1,
        heightConfirmed: 10
      }];
      var spendOutputs = [];

      service.buildAddressSummary(address, tip, allOutputs, spendOutputs).should.deep.equal({
        address: address.toString(),
        transactions: ['B'],
        confirmed: {
          balance: 0,
          sent: 0,
          received: 0
        },
        unconfirmed: {
          balance: 20,
          sent: 0,
          received: 20
        }
      });
    });

    it('works with multiple transactions', function() {
      var allOutputs = [{
        satoshis: 10,
        txId: 'A',
        outputIndex: 1,
        heightConfirmed: 1
      }, {
        satoshis: 20,
        txId: 'B',
        outputIndex: 1,
        heightConfirmed: 10
      }];
      var spendOutputs = [{
        spendInput: {
          prevTxId: 'A',
          outputIndex: 1
        },
        spentTx: 'A',
        heightSpent: 10
      }];

      service.buildAddressSummary(address, tip, allOutputs, spendOutputs).should.deep.equal({
        address: address.toString(),
        transactions: ['A', 'B'],
        confirmed: {
          balance: 10,
          sent: 0,
          received: 10
        },
        unconfirmed: {
          balance: 20,
          sent: 10,
          received: 30
        }
      });
    });

    it('works with a medium amount of transactions', function() {
      var allOutputs = [{
        satoshis: 10,
        txId: 'A',
        outputIndex: 1,
        heightConfirmed: 1
      }, {
        satoshis: 20,
        txId: 'B',
        outputIndex: 1,
        heightConfirmed: 5
      }, {
        satoshis: 30,
        txId: 'C',
        outputIndex: 1,
        heightConfirmed: 10
      }];
      var spendOutputs = [{
        spendInput: {
          prevTxId: 'A',
          outputIndex: 1
        },
        spentTx: 'D',
        heightSpent: 10
      }];

      service.buildAddressSummary(address, tip, allOutputs, spendOutputs).should.deep.equal({
        address: address.toString(),
        transactions: ['A', 'B', 'C', 'D'],
        confirmed: {
          balance: 30,
          sent: 0,
          received: 30
        },
        unconfirmed: {
          balance: 50,
          sent: 10,
          received: 60
        }
      });
    });

    it('works with a transaction that includes twice the same address', function() {
      var allOutputs = [{
        satoshis: 10,
        txId: 'A',
        outputIndex: 0,
        heightConfirmed: 1
      }, {
        satoshis: 10,
        txId: 'A',
        outputIndex: 1,
        heightConfirmed: 1
      }, ];
      var spendOutputs = [];

      service.buildAddressSummary(address, tip, allOutputs, spendOutputs).should.deep.equal({
        address: address.toString(),
        transactions: ['A'],
        confirmed: {
          balance: 20,
          sent: 0,
          received: 20
        },
        unconfirmed: {
          balance: 20,
          sent: 0,
          received: 20
        }
      });
    });

    it('confirmed spent transactions change the balance', function() {
      var allOutputs = [{
        satoshis: 10,
        txId: 'A',
        outputIndex: 0,
        heightConfirmed: 1
      }, ];
      var spendOutputs = [{
        spendInput: {
          prevTxId: 'A',
          outputIndex: 0
        },
        spentTx: 'D',
        heightSpent: 2
      }];

      service.buildAddressSummary(address, tip, allOutputs, spendOutputs).should.deep.equal({
        address: address.toString(),
        transactions: ['A', 'D'],
        confirmed: {
          balance: 0,
          sent: 10,
          received: 10
        },
        unconfirmed: {
          balance: 0,
          sent: 10,
          received: 10
        }
      });
    });

  });
});