var hexpp = require('../hexpp').defaults({ bigendian: false })
var tape = require('tape')
var Hash = require('../hash')

var hex = '0A1B2C3D4E5F6G7H'

function equal (t, a, b) {
  t.equal(a.length, b.length)

  for (var i = 0; i < a.length; i++) {
    t.equal(a[i], b[i])
  }
}

var hexBuf = new Buffer([48, 65, 49, 66, 50, 67, 51, 68, 52, 69, 53, 70, 54, 71, 55, 72])
var count16 = {
  strings: ['0A1B2C3D4E5F6G7H'],
  buffers: [
    hexBuf,
    new Buffer([ 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128])
  ]
}

var empty = {
  strings: [''],
  buffers: [
    new Buffer([ 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ])
  ]
}

var multi = {
      strings: ['abcd', 'efhijk', 'lmnopq'],
      buffers: [
        new Buffer('abcdefhijklmnopq', 'ascii'),
        new Buffer([128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128])
      ]
    }

var long = {
  strings: [hex + hex],
  buffers: [
    hexBuf,
    hexBuf,
    new Buffer([128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0])
  ]
}

function makeTest (name, data) {
  tape(name, function (t) {

    var h = new Hash(16, 8)
    var hash = new Buffer(20)
    var n = 2
    var expected = data.buffers.slice()
    // t.plan(expected.length + 1)

    h._update = function (block) {
      var e = expected.shift()

      console.log('---block---')
      console.log(hexpp(block), block.length)
      console.log('---e---')
      console.log(hexpp(e), block.length)
      console.log(block)
      equal(t, block, e)

      if (n < 0) {
        throw new Error('expecting only 2 calls to _update')
      }

      return hash
    }

    data.strings.forEach(function (string) {
      h.update(string, 'ascii')
    })

    equal(t, h.digest(), hash)
    t.end()
  })
}

makeTest('Hash#update 1 in 1', count16)
makeTest('empty Hash#update', empty)
makeTest('Hash#update 1 in 3', multi)
makeTest('Hash#update 2 in 1', long)