const { describe, it, before } = require('mocha')
const assert = require('assert')
const bitcoin = require('../../')
const regtestUtils = require('./_regtest')
const regtest = regtestUtils.network
const bip68 = require('bip68')

const alice = bitcoin.ECPair.fromWIF('cScfkGjbzzoeewVWmU2hYPUHeVGJRDdFt7WhmrVVGkxpmPP8BHWe', regtest)
const bob = bitcoin.ECPair.fromWIF('cMkopUXKWsEzAjfa1zApksGRwjVpJRB3831qM9W4gKZsLwjHXA9x', regtest)

describe('bitcoinjs-lib (transactions w/ CSV)', function () {
  // force update MTP
  before(async function () {
    await regtestUtils.mine(11)
  })

  const hashType = bitcoin.Transaction.SIGHASH_ALL

  // IF MTP (from when confirmed) > seconds, aQ can redeem
  function csvCheckSigOutput (aQ, bQ, sequence) {
    return bitcoin.script.compile([
      bitcoin.opcodes.OP_IF,
      bitcoin.script.number.encode(sequence),
      bitcoin.opcodes.OP_CHECKSEQUENCEVERIFY,
      bitcoin.opcodes.OP_DROP,

      bitcoin.opcodes.OP_ELSE,
      bQ.publicKey,
      bitcoin.opcodes.OP_CHECKSIGVERIFY,
      bitcoin.opcodes.OP_ENDIF,

      aQ.publicKey,
      bitcoin.opcodes.OP_CHECKSIG
    ])
  }

  // expiry will pass, {Alice's signature} OP_TRUE
  it('can create (and broadcast via 3PBP) a Transaction where Alice can redeem the output after the expiry (in the future)', async function () {
    // 5 blocks from now
    const sequence = bip68.encode({ blocks: 5 })
    const p2sh = bitcoin.payments.p2sh({
      redeem: {
        output: csvCheckSigOutput(alice, bob, sequence)
      },
      network: regtest
    })

    // fund the P2SH(CSV) address
    const unspent = await regtestUtils.faucet(p2sh.address, 1e5)

    const txb = new bitcoin.TransactionBuilder(regtest)
    txb.addInput(unspent.txId, unspent.vout, sequence)
    txb.addOutput(regtestUtils.RANDOM_ADDRESS, 7e4)

    // {Alice's signature} OP_TRUE
    const tx = txb.buildIncomplete()
    const signatureHash = tx.hashForSignature(0, p2sh.redeem.output, hashType)
    const redeemScriptSig = bitcoin.payments.p2sh({
      network: regtest,
      redeem: {
        network: regtest,
        output: p2sh.redeem.output,
        input: bitcoin.script.compile([
          bitcoin.script.signature.encode(alice.sign(signatureHash), hashType),
          bitcoin.opcodes.OP_TRUE
        ])
      }
    }).input
    tx.setInputScript(0, redeemScriptSig)

    // TODO: test that it failures _prior_ to expiry, unfortunately, race conditions when run concurrently
    // ...
    // into the future!
    await regtestUtils.mine(10)

    await regtestUtils.broadcast(tx.toHex())

    await regtestUtils.verify({
      txId: tx.getId(),
      address: regtestUtils.RANDOM_ADDRESS,
      vout: 0,
      value: 7e4
    })
  })

  // expiry in the future, {Alice's signature} OP_TRUE
  it('can create (but fail to broadcast via 3PBP) a Transaction where Alice attempts to redeem before the expiry', async function () {
    // two hours after confirmation
    const sequence = bip68.encode({ seconds: 7168 })
    const p2sh = bitcoin.payments.p2sh({
      network: regtest,
      redeem: {
        output: csvCheckSigOutput(alice, bob, sequence)
      }
    })

    // fund the P2SH(CSV) address
    const unspent = await regtestUtils.faucet(p2sh.address, 2e4)

    const txb = new bitcoin.TransactionBuilder(regtest)
    txb.addInput(unspent.txId, unspent.vout, sequence)
    txb.addOutput(regtestUtils.RANDOM_ADDRESS, 1e4)

    // {Alice's signature} OP_TRUE
    const tx = txb.buildIncomplete()
    const signatureHash = tx.hashForSignature(0, p2sh.redeem.output, hashType)
    const redeemScriptSig = bitcoin.payments.p2sh({
      network: regtest,
      redeem: {
        network: regtest,
        output: p2sh.redeem.output,
        input: bitcoin.script.compile([
          bitcoin.script.signature.encode(alice.sign(signatureHash), hashType),
          bitcoin.script.signature.encode(bob.sign(signatureHash), hashType),
          bitcoin.opcodes.OP_TRUE
        ])
      }
    }).input
    tx.setInputScript(0, redeemScriptSig)

    await regtestUtils.broadcast(tx.toHex()).catch(err => {
      assert.throws(function () {
        if (err) throw err
      }, /Error: non-BIP68-final \(code 64\)/)
    })
  })
})