// Public npm libraries
const assert = require('assert')
const Buffer = require('safe-buffer').Buffer

// Mocks
const fixtures = require('./fixtures/hdnode.json')
// const slpFixtures = require('./fixtures/slp/address.json')

// Unit under test (uut)
const BCHJS = require('../../src/bch-js')
let bchjs

describe('#HDNode', () => {
  beforeEach(() => {
    bchjs = new BCHJS()
  })

  describe('#fromSeed', () => {
    fixtures.fromSeed.forEach(mnemonic => {
      it('should create an HDNode from root seed buffer', async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        assert.notStrictEqual(hdNode, null)
      })
    })
  })

  describe('#derive', () => {
    fixtures.derive.forEach(derive => {
      it('should derive non hardened child HDNode', async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(derive.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const childHDNode = bchjs.HDNode.derive(hdNode, 0)
        assert.strictEqual(bchjs.HDNode.toXPub(childHDNode), derive.xpub)
        assert.strictEqual(bchjs.HDNode.toXPriv(childHDNode), derive.xpriv)
      })
    })
  })

  describe('#deriveHardened', () => {
    fixtures.deriveHardened.forEach(derive => {
      it('should derive hardened child HDNode', async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(derive.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const childHDNode = bchjs.HDNode.deriveHardened(hdNode, 0)
        assert.strictEqual(bchjs.HDNode.toXPub(childHDNode), derive.xpub)
        assert.strictEqual(bchjs.HDNode.toXPriv(childHDNode), derive.xpriv)
      })
    })

    describe('derive BIP44 $BCH account', () => {
      fixtures.deriveBIP44.forEach(derive => {
        it('should derive BIP44 $BCH account', async () => {
          const rootSeedBuffer = await bchjs.Mnemonic.toSeed(derive.mnemonic)
          const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
          const purpose = bchjs.HDNode.deriveHardened(hdNode, 44)
          const coin = bchjs.HDNode.deriveHardened(purpose, 145)
          const childHDNode = bchjs.HDNode.deriveHardened(coin, 0)
          assert.strictEqual(bchjs.HDNode.toXPub(childHDNode), derive.xpub)
          assert.strictEqual(bchjs.HDNode.toXPriv(childHDNode), derive.xpriv)
        })
      })
    })
  })

  describe('#derivePath', () => {
    describe('derive non hardened Path', () => {
      fixtures.derivePath.forEach(derive => {
        it('should derive non hardened child HDNode from path', async () => {
          const rootSeedBuffer = await bchjs.Mnemonic.toSeed(derive.mnemonic)
          const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
          const childHDNode = bchjs.HDNode.derivePath(hdNode, '0')
          assert.strictEqual(bchjs.HDNode.toXPub(childHDNode), derive.xpub)
          assert.strictEqual(bchjs.HDNode.toXPriv(childHDNode), derive.xpriv)
        })
      })
    })

    describe('derive hardened Path', () => {
      fixtures.deriveHardenedPath.forEach(derive => {
        it('should derive hardened child HDNode from path', async () => {
          const rootSeedBuffer = await bchjs.Mnemonic.toSeed(derive.mnemonic)
          const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
          const childHDNode = bchjs.HDNode.derivePath(hdNode, "0'")
          assert.strictEqual(bchjs.HDNode.toXPub(childHDNode), derive.xpub)
          assert.strictEqual(bchjs.HDNode.toXPriv(childHDNode), derive.xpriv)
        })
      })
    })

    describe('derive BIP44 $BCH account', () => {
      fixtures.deriveBIP44.forEach(derive => {
        it('should derive BIP44 $BCH account', async () => {
          const rootSeedBuffer = await bchjs.Mnemonic.toSeed(derive.mnemonic)
          const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
          const childHDNode = bchjs.HDNode.derivePath(hdNode, "44'/145'/0'")
          assert.strictEqual(bchjs.HDNode.toXPub(childHDNode), derive.xpub)
          assert.strictEqual(bchjs.HDNode.toXPriv(childHDNode), derive.xpriv)
        })
      })
    })
  })

  describe('#toLegacyAddress', () => {
    fixtures.toLegacyAddress.forEach(fixture => {
      it(`should get address ${fixture.address} from HDNode`, async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(fixture.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const childHDNode = bchjs.HDNode.derivePath(hdNode, '0')
        const addy = bchjs.HDNode.toLegacyAddress(childHDNode)
        assert.strictEqual(addy, fixture.address)
      })
    })
  })

  describe('#toCashAddress', () => {
    fixtures.toCashAddress.forEach(fixture => {
      it(`should get address ${fixture.address} from HDNode`, async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(fixture.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const childHDNode = bchjs.HDNode.derivePath(hdNode, '0')
        const addy = bchjs.HDNode.toCashAddress(childHDNode)
        assert.strictEqual(addy, fixture.address)
      })

      it(`should get address ${fixture.regtestAddress} from HDNode`, async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(fixture.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const childHDNode = bchjs.HDNode.derivePath(hdNode, '0')
        const addr = bchjs.HDNode.toCashAddress(childHDNode, true)
        assert.strictEqual(addr, fixture.regtestAddress)
      })
    })
  })

  describe('#toWIF', () => {
    fixtures.toWIF.forEach(fixture => {
      it(`should get privateKeyWIF ${fixture.privateKeyWIF} from HDNode`, () => {
        const hdNode = bchjs.HDNode.fromXPriv(fixture.xpriv)
        assert.strictEqual(bchjs.HDNode.toWIF(hdNode), fixture.privateKeyWIF)
      })
    })
  })

  describe('#toXPub', () => {
    fixtures.toXPub.forEach(fixture => {
      it(`should create xpub ${fixture.xpub} from an HDNode`, async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(fixture.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const xpub = bchjs.HDNode.toXPub(hdNode)
        assert.strictEqual(xpub, fixture.xpub)
      })
    })
  })

  describe('#toXPriv', () => {
    fixtures.toXPriv.forEach(fixture => {
      it(`should create xpriv ${fixture.xpriv} from an HDNode`, async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(fixture.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const xpriv = bchjs.HDNode.toXPriv(hdNode)
        assert.strictEqual(xpriv, fixture.xpriv)
      })
    })
  })

  describe('#toKeyPair', () => {
    fixtures.toKeyPair.forEach(fixture => {
      it('should get ECPair from an HDNode', async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(fixture.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const keyPair = bchjs.HDNode.toKeyPair(hdNode)
        assert.strictEqual(typeof keyPair, 'object')
      })
    })
  })

  describe('#toPublicKey', () => {
    fixtures.toPublicKey.forEach(fixture => {
      it('should create public key buffer from an HDNode', async () => {
        const rootSeedBuffer = await bchjs.Mnemonic.toSeed(fixture.mnemonic)
        const hdNode = bchjs.HDNode.fromSeed(rootSeedBuffer)
        const publicKeyBuffer = bchjs.HDNode.toPublicKey(hdNode)
        assert.strictEqual(typeof publicKeyBuffer, 'object')
      })
    })
  })

  describe('#fromXPriv', () => {
    it('should exercise fromXPriv', () => {
      fixtures.fromXPriv.forEach(fixture => {
        const hdNode = bchjs.HDNode.fromXPriv(fixture.xpriv)
        it(`should create HDNode from xpriv ${fixture.xpriv}`, () => {
          assert.notEqual(hdNode, null)
        })

        it(`should export xpriv ${fixture.xpriv}`, () => {
          assert.strictEqual(bchjs.HDNode.toXPriv(hdNode), fixture.xpriv)
        })

        it(`should export xpub ${fixture.xpub}`, () => {
          assert.strictEqual(bchjs.HDNode.toXPub(hdNode), fixture.xpub)
        })

        it(`should export legacy address ${fixture.legacy}`, () => {
          assert.strictEqual(bchjs.HDNode.toLegacyAddress(hdNode), fixture.legacy)
        })

        it(`should export cashaddress ${fixture.cashaddress}`, () => {
          assert.strictEqual(bchjs.HDNode.toCashAddress(hdNode), fixture.cashaddress)
        })

        it(`should export regtest cashaddress ${fixture.regtestaddress}`, () => {
          assert.strictEqual(
            bchjs.HDNode.toCashAddress(hdNode, true),
            fixture.regtestaddress
          )
        })

        it(`should export privateKeyWIF ${fixture.privateKeyWIF}`, () => {
          assert.strictEqual(bchjs.HDNode.toWIF(hdNode), fixture.privateKeyWIF)
        })
      })
    })
  })

  describe('#fromXPub', () => {
    it('should exercise fromXPub', () => {
      fixtures.fromXPub.forEach(fixture => {
        const hdNode = bchjs.HDNode.fromXPub(fixture.xpub)
        it(`should create HDNode from xpub ${fixture.xpub}`, () => {
          assert.notEqual(hdNode, null)
        })

        it(`should export xpub ${fixture.xpub}`, () => {
          assert.strictEqual(bchjs.HDNode.toXPub(hdNode), fixture.xpub)
        })

        it(`should export legacy address ${fixture.legacy}`, () => {
          assert.strictEqual(bchjs.HDNode.toLegacyAddress(hdNode), fixture.legacy)
        })

        it(`should export cashaddress ${fixture.cashaddress}`, () => {
          assert.strictEqual(bchjs.HDNode.toCashAddress(hdNode), fixture.cashaddress)
        })

        it(`should export regtest cashaddress ${fixture.regtestaddress}`, () => {
          assert.strictEqual(
            bchjs.HDNode.toCashAddress(hdNode, true),
            fixture.regtestaddress
          )
        })
      })
    })
  })

  describe('#bip32', () => {
    it('should create accounts and addresses', () => {
      fixtures.accounts.forEach(async fixture => {
        const seedBuffer = await bchjs.Mnemonic.toSeed(fixture.mnemonic)
        console.log(`seedBuffer: ${seedBuffer.toString()}`)
        const hdNode = bchjs.HDNode.fromSeed(seedBuffer)
        const a = bchjs.HDNode.derivePath(hdNode, "0'")
        const external = bchjs.HDNode.derivePath(a, '0')
        const account = bchjs.HDNode.createAccount([external])

        it('#createAccount', () => {
          assert.notEqual(account, null)
        })

        describe('#getChainAddress', () => {
          const external1 = bchjs.Address.toCashAddress(
            account.getChainAddress(0)
          )
          it(`should create external change address ${external1}`, () => {
            assert.strictEqual(external1, fixture.externals[0])
          })
        })

        describe('#nextChainAddress', () => {
          for (let i = 0; i < 4; i++) {
            const ex = bchjs.Address.toCashAddress(account.nextChainAddress(0))
            it(`should create external change address ${ex}`, () => {
              assert.strictEqual(ex, fixture.externals[i + 1])
            })
          }
        })
      })
    })
  })

  describe('#sign', () => {
    fixtures.sign.forEach(fixture => {
      it('should sign 32 byte hash buffer', () => {
        const hdnode = bchjs.HDNode.fromXPriv(fixture.privateKeyWIF)
        const buf = Buffer.from(bchjs.Crypto.sha256(fixture.data), 'hex')
        const signatureBuf = bchjs.HDNode.sign(hdnode, buf)
        assert.strictEqual(typeof signatureBuf, 'object')
      })
    })
  })

  describe('#verify', () => {
    fixtures.verify.forEach(fixture => {
      it('should verify signed 32 byte hash buffer', () => {
        const hdnode1 = bchjs.HDNode.fromXPriv(fixture.privateKeyWIF1)
        const buf = Buffer.from(bchjs.Crypto.sha256(fixture.data), 'hex')
        const signature = bchjs.HDNode.sign(hdnode1, buf)
        const verify = bchjs.HDNode.verify(hdnode1, buf, signature)
        assert.strictEqual(verify, true)
      })
    })
  })

  describe('#isPublic', () => {
    fixtures.isPublic.forEach(fixture => {
      it('should verify hdnode is public', () => {
        const node = bchjs.HDNode.fromXPub(fixture.xpub)
        assert.strictEqual(bchjs.HDNode.isPublic(node), true)
      })
    })

    fixtures.isPublic.forEach(fixture => {
      it('should verify hdnode is not public', () => {
        const node = bchjs.HDNode.fromXPriv(fixture.xpriv)
        assert.strictEqual(bchjs.HDNode.isPublic(node), false)
      })
    })
  })

  describe('#isPrivate', () => {
    fixtures.isPrivate.forEach(fixture => {
      it('should verify hdnode is not private', () => {
        const node = bchjs.HDNode.fromXPub(fixture.xpub)
        assert.strictEqual(bchjs.HDNode.isPrivate(node), false)
      })
    })

    fixtures.isPrivate.forEach(fixture => {
      it('should verify hdnode is private', () => {
        const node = bchjs.HDNode.fromXPriv(fixture.xpriv)
        assert.strictEqual(bchjs.HDNode.isPrivate(node), true)
      })
    })
  })

  describe('#toIdentifier', () => {
    fixtures.toIdentifier.forEach(fixture => {
      it('should get identifier of hdnode', () => {
        const node = bchjs.HDNode.fromXPriv(fixture.xpriv)
        const publicKeyBuffer = bchjs.HDNode.toPublicKey(node)
        const hash160 = bchjs.Crypto.hash160(publicKeyBuffer)
        const identifier = bchjs.HDNode.toIdentifier(node)
        assert.strictEqual(identifier.toString('hex'), hash160.toString('hex'))
      })
    })
  })
})