import assert from 'assert'
import fs from 'fs'
import { join } from 'path'

import {
  computeStateTreeHash,
  computeTransactionTreeHash,
  computeAccountRootIndex,
  computeTrustlineHash,
  computeOfferIndex,
  computeSignerListIndex,
  computeEscrowHash,
  computePaymentChannelHash,
} from '../../src/utils/hashes'

/**
 * Expects a corresponding ledger dump in $repo/test/fixtures/rippled folder.
 *
 * @param ledgerIndex - The ledger index of the desired dump.
 */
function createLedgerTest(ledgerIndex: number): void {
  const ledgerIndexString = String(ledgerIndex)
  const path = join(
    __dirname,
    '..',
    `fixtures/rippled/ledgerFull${ledgerIndex}.json`,
  )

  // eslint-disable-next-line node/no-sync -- must be sync version when not in async method
  const ledgerRaw = fs.readFileSync(path, { encoding: 'utf8' })
  const ledgerJSON = JSON.parse(ledgerRaw)

  const hasAccounts =
    Array.isArray(ledgerJSON.accountState) && ledgerJSON.accountState.length > 0

  describe(`ledger hashes ${ledgerIndexString}`, function () {
    if (hasAccounts) {
      // eslint-disable-next-line @typescript-eslint/restrict-template-expressions -- known to be a string
      it(`has account_hash of ${ledgerJSON.account_hash}`, function () {
        assert.equal(
          ledgerJSON.account_hash,
          computeStateTreeHash(ledgerJSON.accountState),
        )
      })
    }
    // eslint-disable-next-line @typescript-eslint/restrict-template-expressions -- known to be a string
    it(`has transaction_hash of ${ledgerJSON.transaction_hash}`, function () {
      assert.equal(
        ledgerJSON.transaction_hash,
        computeTransactionTreeHash(ledgerJSON.transactions),
      )
    })
  })
}

describe('Hashes', function () {
  // This is the first recorded ledger with a non empty transaction set
  // eslint-disable-next-line mocha/no-setup-in-describe -- runs tests
  createLedgerTest(38129)
  // Because, why not.
  // eslint-disable-next-line mocha/no-setup-in-describe -- runs tests
  createLedgerTest(40000)
  // 1311 AffectedNodes, no accounts
  // eslint-disable-next-line mocha/no-setup-in-describe -- runs tests
  createLedgerTest(7501326)

  describe('calcAccountRootEntryHash', function () {
    it('will calculate the AccountRoot entry hash for rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
      const account = 'rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh'
      const expectedEntryHash =
        '2B6AC232AA4C4BE41BF49D2459FA4A0347E1B543A4C92FCEE0821C0201E2E9A8'
      const actualEntryHash = computeAccountRootIndex(account)

      assert.equal(actualEntryHash, expectedEntryHash)
    })
  })

  describe('calcRippleStateEntryHash', function () {
    it('will calculate the RippleState entry hash for rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh and rB5TihdPbKgMrkFqrqUC3yLdE8hhv4BdeY in USD', function () {
      const account1 = 'rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh'
      const account2 = 'rB5TihdPbKgMrkFqrqUC3yLdE8hhv4BdeY'
      const currency = 'USD'

      const expectedEntryHash =
        'C683B5BB928F025F1E860D9D69D6C554C2202DE0D45877ADB3077DA4CB9E125C'
      const actualEntryHash1 = computeTrustlineHash(
        account1,
        account2,
        currency,
      )
      const actualEntryHash2 = computeTrustlineHash(
        account2,
        account1,
        currency,
      )

      assert.equal(actualEntryHash1, expectedEntryHash)
      assert.equal(actualEntryHash2, expectedEntryHash)
    })

    it('will calculate the RippleState entry hash for r3kmLJN5D28dHuH8vZNUZpMC43pEHpaocV and rUAMuQTfVhbfqUDuro7zzy4jj4Wq57MPTj in UAM', function () {
      const account1 = 'r3kmLJN5D28dHuH8vZNUZpMC43pEHpaocV'
      const account2 = 'rUAMuQTfVhbfqUDuro7zzy4jj4Wq57MPTj'
      const currency = 'UAM'

      const expectedEntryHash =
        'AE9ADDC584358E5847ADFC971834E471436FC3E9DE6EA1773DF49F419DC0F65E'
      const actualEntryHash1 = computeTrustlineHash(
        account1,
        account2,
        currency,
      )
      const actualEntryHash2 = computeTrustlineHash(
        account2,
        account1,
        currency,
      )

      assert.equal(actualEntryHash1, expectedEntryHash)
      assert.equal(actualEntryHash2, expectedEntryHash)
    })
  })

  describe('calcOfferEntryHash', function () {
    it('will calculate the Offer entry hash for r32UufnaCGL82HubijgJGDmdE5hac7ZvLw, sequence 137', function () {
      const account = 'r32UufnaCGL82HubijgJGDmdE5hac7ZvLw'
      const sequence = 137
      const expectedEntryHash =
        '03F0AED09DEEE74CEF85CD57A0429D6113507CF759C597BABB4ADB752F734CE3'
      const actualEntryHash = computeOfferIndex(account, sequence)

      assert.equal(actualEntryHash, expectedEntryHash)
    })
  })

  describe('computeSignerListIndex', function () {
    it('will calculate the SignerList index for r32UufnaCGL82HubijgJGDmdE5hac7ZvLw', function () {
      const account = 'rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh'
      const expectedEntryHash =
        '778365D5180F5DF3016817D1F318527AD7410D83F8636CF48C43E8AF72AB49BF'
      const actualEntryHash = computeSignerListIndex(account)
      assert.equal(actualEntryHash, expectedEntryHash)
    })
  })

  describe('calcEscrowEntryHash', function () {
    it('will calculate the Escrow entry hash for rDx69ebzbowuqztksVDmZXjizTd12BVr4x, sequence 84', function () {
      const account = 'rDx69ebzbowuqztksVDmZXjizTd12BVr4x'
      const sequence = 84
      const expectedEntryHash =
        '61E8E8ED53FA2CEBE192B23897071E9A75217BF5A410E9CB5B45AAB7AECA567A'
      const actualEntryHash = computeEscrowHash(account, sequence)

      assert.equal(actualEntryHash, expectedEntryHash)
    })
  })

  describe('calcPaymentChannelEntryHash', function () {
    it('will calculate the PaymentChannel entry hash for rDx69ebzbowuqztksVDmZXjizTd12BVr4x and rLFtVprxUEfsH54eCWKsZrEQzMDsx1wqso, sequence 82', function () {
      const account = 'rDx69ebzbowuqztksVDmZXjizTd12BVr4x'
      const dstAccount = 'rLFtVprxUEfsH54eCWKsZrEQzMDsx1wqso'
      const sequence = 82
      const expectedEntryHash =
        'E35708503B3C3143FB522D749AAFCC296E8060F0FB371A9A56FAE0B1ED127366'
      const actualEntryHash = computePaymentChannelHash(
        account,
        dstAccount,
        sequence,
      )

      assert.equal(actualEntryHash, expectedEntryHash)
    })
  })
})