/*
  TESTS FOR THE ELECTRUMX.JS LIBRARY

  This test file uses the environment variable TEST to switch between unit
  and integration tests. By default, TEST is set to 'unit'. Set this variable
  to 'integration' to run the tests against BCH mainnet.

  To-Do:
*/

'use strict'

const chai = require('chai')
const assert = chai.assert

const sinon = require('sinon')

let originalUrl // Used during transition from integration to unit tests.

// Set default environment variables for unit tests.
if (!process.env.TEST) process.env.TEST = 'unit'
if (process.env.TEST === 'unit') {
  process.env.BLOCKBOOK_URL = 'http://fakeurl/api/'
}

// Only load blockbook library after setting BLOCKBOOK_URL env var.
const ElecrumxRoute = require('../../src/routes/v3/electrumx')
const electrumxRoute = new ElecrumxRoute()

// Mocking data.
const { mockReq, mockRes } = require('./mocks/express-mocks')
const mockData = require('./mocks/electrumx-mock')

// Used for debugging.
const util = require('util')
util.inspect.defaultOptions = { depth: 1 }

describe('#ElectrumX Router', () => {
  let req, res
  let sandbox

  before(async () => {
    // console.log(`Testing type is: ${process.env.TEST}`)

    if (!process.env.NETWORK) process.env.NETWORK = 'testnet'

    // Connect to electrumx servers if this is an integration test.
    if (process.env.TEST === 'integration') {
      await electrumxRoute.connect()
      console.log('Connected to ElectrumX server')
    }
  })

  after(async () => {
    // Disconnect from the electrumx server if this is an integration test.
    if (process.env.TEST === 'integration') {
      await electrumxRoute.disconnect()
      console.log('Disconnected from ElectrumX server')
    }
  })

  // Setup the mocks before each test.
  beforeEach(() => {
    // Mock the req and res objects used by Express routes.
    req = mockReq
    res = mockRes

    // Explicitly reset the parmas and body.
    req.params = {}
    req.body = {}
    req.query = {}

    sandbox = sinon.createSandbox()
  })

  afterEach(() => {
    sandbox.restore()
  })

  after(() => {
    process.env.BLOCKBOOK_URL = originalUrl
  })

  describe('#root', () => {
    // root route handler.
    const root = electrumxRoute.root

    it('should respond to GET for base route', async () => {
      const result = root(req, res)

      assert.equal(result.status, 'electrumx', 'Returns static string')
    })
  })

  describe('#addressToScripthash', () => {
    it('should accurately return a scripthash', () => {
      const addr = 'bitcoincash:qpr270a5sxphltdmggtj07v4nskn9gmg9yx4m5h7s4'

      const scripthash = electrumxRoute.addressToScripthash(addr)

      const expectedOutput =
        'bce4d5f2803bd1ed7c1ba00dcb3edffcbba50524af7c879d6bb918d04f138965'

      assert.equal(scripthash, expectedOutput)
    })
  })

  describe('#UTXO', () => {
    it('should throw 400 if address is empty', async () => {
      const result = await electrumxRoute.getUtxos(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.equal(res.statusCode, 400, 'Expect 400 status code')

      assert.property(result, 'error')
      assert.include(result.error, 'Unsupported address format')

      assert.property(result, 'success')
      assert.equal(result.success, false)
    })

    it('should throw 400 on array input', async () => {
      req.params.address = ['qzs02v05l7qs5s24srqju498qu55dwuj0cx5ehjm2c']

      const result = await electrumxRoute.getUtxos(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.equal(res.statusCode, 400, 'Expect 400 status code')

      assert.property(result, 'error')
      assert.include(result.error, 'address can not be an array')

      assert.property(result, 'success')
      assert.equal(result.success, false)
    })

    it('should throw an error for an invalid address', async () => {
      req.params.address = '02v05l7qs5s24srqju498qu55dwuj0cx5ehjm2c'

      const result = await electrumxRoute.getUtxos(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.equal(res.statusCode, 400, 'Expect 400 status code')

      assert.property(result, 'error')
      assert.include(result.error, 'Unsupported address format')

      assert.property(result, 'success')
      assert.equal(result.success, false)
    })

    it('should detect a network mismatch', async () => {
      req.params.address = 'bchtest:qq89kjkeqz9mngp8kl3dpmu43y2wztdjqu500gn4c4'

      const result = await electrumxRoute.getUtxos(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.equal(res.statusCode, 400, 'Expect 400 status code')

      assert.property(result, 'error')
      assert.include(result.error, 'Invalid network', 'Proper error message')

      assert.property(result, 'success')
      assert.equal(result.success, false)
    })
  })

  describe('#_utxosFromElectrumx', () => {
    // Unit test only.
    if (process.env.TEST === 'unit') {
      it('should pass errors from ElectrumX to user', async () => {
        req.params.address =
          'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf'

        electrumxRoute.isReady = true // Force flag.

        sandbox
          .stub(electrumxRoute.electrumx, 'request')
          .resolves(mockData.utxos)
      })
    }

    it('should get balance for a single address', async () => {
      req.params.address =
        'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf'

      // Mock unit tests to prevent live network calls.
      if (process.env.TEST === 'unit') {
        electrumxRoute.isReady = true // Force flag.

        sandbox
          .stub(electrumxRoute.electrumx, 'request')
          .resolves(mockData.utxos)
      }

      // Call the details API.
      const result = await electrumxRoute.getUtxos(req, res)
      console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.property(result, 'success')
      assert.equal(result.success, true)

      assert.property(result, 'utxos')
      assert.isArray(result.utxos)

      assert.property(result.utxos[0], 'height')
      assert.property(result.utxos[0], 'tx_hash')
      assert.property(result.utxos[0], 'tx_pos')
      assert.property(result.utxos[0], 'value')
    })
  })
})