// TODO: port to Python
'use strict';


var assert = require('assert');
var decode = require('../decode');

function encodeBinary(str) {
  var result = '';

  str = str.replace(/\s+/g, '');
  while (str.length) {
    result = '%' + ('0' + parseInt(str.slice(-8), 2).toString(16)).slice(-2) + result;
    str = str.slice(0, -8);
  }

  return result;
}

var samples = {
  '00000000': true,
  '01010101': true,
  '01111111': true,

  // invalid as 1st byte
  '10000000': true,
  '10111111': true,

  // invalid sequences, 2nd byte should be >= 0x80
  '11000111 01010101': false,
  '11100011 01010101': false,
  '11110001 01010101': false,

  // invalid sequences, 2nd byte should be < 0xc0
  '11000111 11000000': false,
  '11100011 11000000': false,
  '11110001 11000000': false,

  // invalid 3rd byte
  '11100011 10010101 01010101': false,
  '11110001 10010101 01010101': false,

  // invalid 4th byte
  '11110001 10010101 10010101 01010101': false,

  // valid sequences
  '11000111 10101010': true,
  '11100011 10101010 10101010': true,
  '11110001 10101010 10101010 10101010': true,

  // minimal chars with given length
  '11000010 10000000': true,
  '11100000 10100000 10000000': true,

  // impossible sequences
  '11000001 10111111': false,
  '11100000 10011111 10111111': false,
  '11000001 10000000': false,
  '11100000 10010000 10000000': false,

  // maximum chars with given length
  '11011111 10111111': true,
  '11101111 10111111 10111111': true,

  '11110000 10010000 10000000 10000000': true,
  '11110000 10010000 10001111 10001111': true,
  '11110100 10001111 10110000 10000000': true,
  '11110100 10001111 10111111 10111111': true,

  // too low
  '11110000 10001111 10111111 10111111': false,

  // too high
  '11110100 10010000 10000000 10000000': false,
  '11110100 10011111 10111111 10111111': false,

  // surrogate range
  '11101101 10011111 10111111': true,
  '11101101 10100000 10000000': false,
  '11101101 10111111 10111111': false,
  '11101110 10000000 10000000': true
};

describe('decode', function() {
  it('should decode %xx', function() {
    assert.equal(decode('x%20xx%20%2520'), 'x xx %20');
  });

  it('should not decode invalid sequences', function() {
    assert.equal(decode('%2g%z1%%'), '%2g%z1%%');
  });

  it('should not decode reservedSet', function() {
    assert.equal(decode('%20%25%20', '%'),  ' %25 ');
    assert.equal(decode('%20%25%20', ' '),  '%20%%20');
    assert.equal(decode('%20%25%20', ' %'), '%20%25%20');
  });

  describe('utf8', function() {
    Object.keys(samples).forEach(function(k) {
      it(k, function() {
        var res1, res2,
            er = null,
            str = encodeBinary(k);

        try {
          res1 = decodeURIComponent(str);
        } catch(e) {
          er = e;
        }

        res2 = decode(str);

        if (er) {
          assert.notEqual(res2.indexOf('\ufffd'), -1);
        } else {
          assert.equal(res1, res2);
          assert.equal(res2.indexOf('\ufffd'), -1);
        }
      });
    });
  });
});