const assert = require('assert')
const clone = require('clone')
const ObservableStore = require('obs-store')
const TxStateManager = require('../../../../../app/scripts/controllers/transactions/tx-state-manager')
const txStateHistoryHelper = require('../../../../../app/scripts/controllers/transactions/lib/tx-state-history-helper')
const noop = () => true

describe('TransactionStateManager', function () {
  let txStateManager
  const currentNetworkId = 42
  const otherNetworkId = 2

  beforeEach(function () {
    txStateManager = new TxStateManager({
      initState: {
        transactions: [],
      },
      txHistoryLimit: 10,
      getNetwork: () => currentNetworkId
    })
  })

  describe('#setTxStatusSigned', function () {
    it('sets the tx status to signed', function () {
      let tx = { id: 1, status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }
      txStateManager.addTx(tx, noop)
      txStateManager.setTxStatusSigned(1)
      let result = txStateManager.getTxList()
      assert.ok(Array.isArray(result))
      assert.equal(result.length, 1)
      assert.equal(result[0].status, 'signed')
    })

    it('should emit a signed event to signal the exciton of callback', (done) => {
      let tx = { id: 1, status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }
      const noop = function () {
        assert(true, 'event listener has been triggered and noop executed')
        done()
      }
      txStateManager.addTx(tx)
      txStateManager.on('1:signed', noop)
      txStateManager.setTxStatusSigned(1)

    })
  })

  describe('#setTxStatusRejected', function () {
    it('sets the tx status to rejected', function () {
      let tx = { id: 1, status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }
      txStateManager.addTx(tx)
      txStateManager.setTxStatusRejected(1)
      let result = txStateManager.getTxList()
      assert.ok(Array.isArray(result))
      assert.equal(result.length, 1)
      assert.equal(result[0].status, 'rejected')
    })

    it('should emit a rejected event to signal the exciton of callback', (done) => {
      let tx = { id: 1, status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }
      txStateManager.addTx(tx)
      const noop = function (err, txId) {
        assert(true, 'event listener has been triggered and noop executed')
        done()
      }
      txStateManager.on('1:rejected', noop)
      txStateManager.setTxStatusRejected(1)
    })
  })

  describe('#getFullTxList', function () {
    it('when new should return empty array', function () {
      let result = txStateManager.getTxList()
      assert.ok(Array.isArray(result))
      assert.equal(result.length, 0)
    })
  })

  describe('#getTxList', function () {
    it('when new should return empty array', function () {
      let result = txStateManager.getTxList()
      assert.ok(Array.isArray(result))
      assert.equal(result.length, 0)
    })
  })

  describe('#addTx', function () {
    it('adds a tx returned in getTxList', function () {
      let tx = { id: 1, status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {} }
      txStateManager.addTx(tx, noop)
      let result = txStateManager.getTxList()
      assert.ok(Array.isArray(result))
      assert.equal(result.length, 1)
      assert.equal(result[0].id, 1)
    })

    it('does not override txs from other networks', function () {
      let tx = { id: 1, status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {} }
      let tx2 = { id: 2, status: 'confirmed', metamaskNetworkId: otherNetworkId, txParams: {} }
      txStateManager.addTx(tx, noop)
      txStateManager.addTx(tx2, noop)
      let result = txStateManager.getFullTxList()
      let result2 = txStateManager.getTxList()
      assert.equal(result.length, 2, 'txs were deleted')
      assert.equal(result2.length, 1, 'incorrect number of txs on network.')
    })

    it('cuts off early txs beyond a limit', function () {
      const limit = txStateManager.txHistoryLimit
      for (let i = 0; i < limit + 1; i++) {
        const tx = { id: i, time: new Date(), status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {} }
        txStateManager.addTx(tx, noop)
      }
      let result = txStateManager.getTxList()
      assert.equal(result.length, limit, `limit of ${limit} txs enforced`)
      assert.equal(result[0].id, 1, 'early txs truncted')
    })

    it('cuts off early txs beyond a limit whether or not it is confirmed or rejected', function () {
      const limit = txStateManager.txHistoryLimit
      for (let i = 0; i < limit + 1; i++) {
        const tx = { id: i, time: new Date(), status: 'rejected', metamaskNetworkId: currentNetworkId, txParams: {} }
        txStateManager.addTx(tx, noop)
      }
      let result = txStateManager.getTxList()
      assert.equal(result.length, limit, `limit of ${limit} txs enforced`)
      assert.equal(result[0].id, 1, 'early txs truncted')
    })

    it('cuts off early txs beyond a limit but does not cut unapproved txs', function () {
      let unconfirmedTx = { id: 0, time: new Date(), status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }
      txStateManager.addTx(unconfirmedTx, noop)
      const limit = txStateManager.txHistoryLimit
      for (let i = 1; i < limit + 1; i++) {
        const tx = { id: i, time: new Date(), status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {} }
        txStateManager.addTx(tx, noop)
      }
      let result = txStateManager.getTxList()
      assert.equal(result.length, limit, `limit of ${limit} txs enforced`)
      assert.equal(result[0].id, 0, 'first tx should still be there')
      assert.equal(result[0].status, 'unapproved', 'first tx should be unapproved')
      assert.equal(result[1].id, 2, 'early txs truncted')
    })
  })

  describe('#updateTx', function () {
    it('replaces the tx with the same id', function () {
      txStateManager.addTx({ id: '1', status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }, noop)
      txStateManager.addTx({ id: '2', status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {} }, noop)
      const txMeta = txStateManager.getTx('1')
      txMeta.hash = 'foo'
      txStateManager.updateTx(txMeta)
      let result = txStateManager.getTx('1')
      assert.equal(result.hash, 'foo')
    })

    it('updates gas price and adds history items', function () {
      const originalGasPrice = '0x01'
      const desiredGasPrice = '0x02'

      const txMeta = {
        id: '1',
        status: 'unapproved',
        metamaskNetworkId: currentNetworkId,
        txParams: {
          gasPrice: originalGasPrice,
        },
      }

      const updatedMeta = clone(txMeta)

      txStateManager.addTx(txMeta)
      const updatedTx = txStateManager.getTx('1')
      // verify tx was initialized correctly
      assert.equal(updatedTx.history.length, 1, 'one history item (initial)')
      assert.equal(Array.isArray(updatedTx.history[0]), false, 'first history item is initial state')
      assert.deepEqual(updatedTx.history[0], txStateHistoryHelper.snapshotFromTxMeta(updatedTx), 'first history item is initial state')
      // modify value and updateTx
      updatedTx.txParams.gasPrice = desiredGasPrice
      const before = new Date().getTime()
      txStateManager.updateTx(updatedTx)
      const after = new Date().getTime()
      // check updated value
      const result = txStateManager.getTx('1')
      assert.equal(result.txParams.gasPrice, desiredGasPrice, 'gas price updated')
      // validate history was updated
      assert.equal(result.history.length, 2, 'two history items (initial + diff)')
      assert.equal(result.history[1].length, 1, 'two history state items (initial + diff)')
      
      const expectedEntry = { op: 'replace', path: '/txParams/gasPrice', value: desiredGasPrice }
      assert.deepEqual(result.history[1][0].op, expectedEntry.op, 'two history items (initial + diff) operation')
      assert.deepEqual(result.history[1][0].path, expectedEntry.path, 'two history items (initial + diff) path')
      assert.deepEqual(result.history[1][0].value, expectedEntry.value, 'two history items (initial + diff) value')
      assert.ok(result.history[1][0].timestamp >= before && result.history[1][0].timestamp <= after)
    })
  })

  describe('#getUnapprovedTxList', function () {
    it('returns unapproved txs in a hash', function () {
      txStateManager.addTx({ id: '1', status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }, noop)
      txStateManager.addTx({ id: '2', status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {} }, noop)
      const result = txStateManager.getUnapprovedTxList()
      assert.equal(typeof result, 'object')
      assert.equal(result['1'].status, 'unapproved')
      assert.equal(result['2'], undefined)
    })
  })

  describe('#getTx', function () {
    it('returns a tx with the requested id', function () {
      txStateManager.addTx({ id: '1', status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }, noop)
      txStateManager.addTx({ id: '2', status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {} }, noop)
      assert.equal(txStateManager.getTx('1').status, 'unapproved')
      assert.equal(txStateManager.getTx('2').status, 'confirmed')
    })
  })

  describe('#getFilteredTxList', function () {
    it('returns a tx with the requested data', function () {
      const txMetas = [
        { id: 0, status: 'unapproved', txParams: { from: '0xaa', to: '0xbb' }, metamaskNetworkId: currentNetworkId },
        { id: 1, status: 'unapproved', txParams: { from: '0xaa', to: '0xbb' }, metamaskNetworkId: currentNetworkId },
        { id: 2, status: 'unapproved', txParams: { from: '0xaa', to: '0xbb' }, metamaskNetworkId: currentNetworkId },
        { id: 3, status: 'unapproved', txParams: { from: '0xbb', to: '0xaa' }, metamaskNetworkId: currentNetworkId },
        { id: 4, status: 'unapproved', txParams: { from: '0xbb', to: '0xaa' }, metamaskNetworkId: currentNetworkId },
        { id: 5, status: 'confirmed', txParams: { from: '0xaa', to: '0xbb' }, metamaskNetworkId: currentNetworkId },
        { id: 6, status: 'confirmed', txParams: { from: '0xaa', to: '0xbb' }, metamaskNetworkId: currentNetworkId },
        { id: 7, status: 'confirmed', txParams: { from: '0xbb', to: '0xaa' }, metamaskNetworkId: currentNetworkId },
        { id: 8, status: 'confirmed', txParams: { from: '0xbb', to: '0xaa' }, metamaskNetworkId: currentNetworkId },
        { id: 9, status: 'confirmed', txParams: { from: '0xbb', to: '0xaa' }, metamaskNetworkId: currentNetworkId },
      ]
      txMetas.forEach((txMeta) => txStateManager.addTx(txMeta, noop))
      let filterParams

      filterParams = { status: 'unapproved', from: '0xaa' }
      assert.equal(txStateManager.getFilteredTxList(filterParams).length, 3, `getFilteredTxList - ${JSON.stringify(filterParams)}`)
      filterParams = { status: 'unapproved', to: '0xaa' }
      assert.equal(txStateManager.getFilteredTxList(filterParams).length, 2, `getFilteredTxList - ${JSON.stringify(filterParams)}`)
      filterParams = { status: 'confirmed', from: '0xbb' }
      assert.equal(txStateManager.getFilteredTxList(filterParams).length, 3, `getFilteredTxList - ${JSON.stringify(filterParams)}`)
      filterParams = { status: 'confirmed' }
      assert.equal(txStateManager.getFilteredTxList(filterParams).length, 5, `getFilteredTxList - ${JSON.stringify(filterParams)}`)
      filterParams = { from: '0xaa' }
      assert.equal(txStateManager.getFilteredTxList(filterParams).length, 5, `getFilteredTxList - ${JSON.stringify(filterParams)}`)
      filterParams = { to: '0xaa' }
      assert.equal(txStateManager.getFilteredTxList(filterParams).length, 5, `getFilteredTxList - ${JSON.stringify(filterParams)}`)
    })
  })

  describe('#wipeTransactions', function () {

    const specificAddress = '0xaa'
    const otherAddress = '0xbb'

    it('should remove only the transactions from a specific address', function () {

      const txMetas = [
        { id: 0, status: 'unapproved', txParams: { from: specificAddress, to: otherAddress }, metamaskNetworkId: currentNetworkId },
        { id: 1, status: 'confirmed', txParams: { from: otherAddress, to: specificAddress }, metamaskNetworkId: currentNetworkId },
        { id: 2, status: 'confirmed', txParams: { from: otherAddress, to: specificAddress }, metamaskNetworkId: currentNetworkId },
      ]
      txMetas.forEach((txMeta) => txStateManager.addTx(txMeta, noop))

      txStateManager.wipeTransactions(specificAddress)

      const transactionsFromCurrentAddress = txStateManager.getTxList().filter((txMeta) => txMeta.txParams.from === specificAddress)
      const transactionsFromOtherAddresses = txStateManager.getTxList().filter((txMeta) => txMeta.txParams.from !== specificAddress)

      assert.equal(transactionsFromCurrentAddress.length, 0)
      assert.equal(transactionsFromOtherAddresses.length, 2)
    })

    it('should not remove the transactions from other networks', function () {
      const txMetas = [
        { id: 0, status: 'unapproved', txParams: { from: specificAddress, to: otherAddress }, metamaskNetworkId: currentNetworkId },
        { id: 1, status: 'confirmed', txParams: { from: specificAddress, to: otherAddress }, metamaskNetworkId: otherNetworkId },
        { id: 2, status: 'confirmed', txParams: { from: specificAddress, to: otherAddress }, metamaskNetworkId: otherNetworkId },
      ]

      txMetas.forEach((txMeta) => txStateManager.addTx(txMeta, noop))

      txStateManager.wipeTransactions(specificAddress)

      const txsFromCurrentNetworkAndAddress = txStateManager.getTxList().filter((txMeta) => txMeta.txParams.from === specificAddress)
      const txFromOtherNetworks = txStateManager.getFullTxList().filter((txMeta) => txMeta.metamaskNetworkId === otherNetworkId)

      assert.equal(txsFromCurrentNetworkAndAddress.length, 0)
      assert.equal(txFromOtherNetworks.length, 2)

    })
  })

  describe.only('#_removeTx', function () {
    it('should remove the transaction from the storage', () => {
      txStateManager._saveTxList([ {id: 1} ])
      txStateManager._removeTx(1)
      assert(!txStateManager.getFullTxList().length, 'txList should be empty')
    })

    it('should only remove the transaction with ID 1 from the storage', () => {
      txStateManager._saveTxList([ {id: 1}, {id: 2} ])
      txStateManager._removeTx(1)
      assert.equal(txStateManager.getFullTxList()[0].id, 2, 'txList should have a id of 2')
    })
  })
})