/*eslint no-bitwise:0 */

const DATA_PREFIX = "data-poll-";
const DEFAULT_POLL_NAME = "poll";
const WHITELISTED_ATTRIBUTES = ["type", "name", "min", "max", "step", "order", "status", "public", "close"];

function replaceToken(tokens, target, list) {
  let pos = tokens.indexOf(target);
  let level = tokens[pos].level;

  tokens.splice(pos, 1, ...list);
  list[0].map = target.map;

  // resequence levels
  for(;pos<tokens.length;pos++) {
    let nesting = tokens[pos].nesting;
    if (nesting < 0) { level--; }
    tokens[pos].level = level;
    if (nesting > 0) { level++; }
  }
}

// analyzes the block to that we have poll options
function getListItems(tokens, startToken) {
  let i = tokens.length-1;
  let listItems = [];
  let buffer = [];

  for(;tokens[i]!==startToken;i--) {
    if (i === 0) {
      return;
    }

    let token = tokens[i];
    if (token.level === 0) {
      if (token.tag !== 'ol' && token.tag !== 'ul') {
        return;
      }
    }

    if (token.level === 1 && token.nesting === 1) {
      if (token.tag === 'li') {
        listItems.push([token, buffer.reverse().join(' ')]);
      } else {
        return;
      }
    }

    if (token.level === 1 && token.nesting === 1 && token.tag === 'li') {
      buffer = [];
    } else {
      if (token.type === 'text' || token.type === 'inline') {
        buffer.push(token.content);
      }
    }
  }

  return listItems.reverse();
}

function invalidPoll(state, tag) {
  let token = state.push('text', '', 0);
  token.content = '[/' + tag + ']';
}

const rule = {
  tag: 'poll',

  before: function(state, tagInfo, raw){
    let token = state.push('text', '', 0);
    token.content = raw;
    token.bbcode_attrs = tagInfo.attrs;
    token.bbcode_type = 'poll_open';
  },

  after: function(state, openToken, raw) {

    let items = getListItems(state.tokens, openToken);
    if (!items) {
      return invalidPoll(state, raw);
    }

    const attrs = openToken.bbcode_attrs;

    // default poll attributes
    const attributes = [["class", "poll"]];

    if (!attrs['status']) {
      attributes.push([DATA_PREFIX + "status", "open"]);
    }

    WHITELISTED_ATTRIBUTES.forEach(name => {
      if (attrs[name]) {
        attributes.push([DATA_PREFIX + name, attrs[name]]);
      }
    });

    if (!attrs.name) {
      attributes.push([DATA_PREFIX + "name", DEFAULT_POLL_NAME]);
    }

    // we might need these values later...
    let min = parseInt(attrs["min"], 10);
    let max = parseInt(attrs["max"], 10);
    let step = parseInt(attrs["step"], 10);

    // infinite loop if step < 1
    if (step < 1) {
      step = 1;
    }

    let header = [];

    let token = new state.Token('poll_open', 'div', 1);
    token.block = true;
    token.attrs = attributes;
    header.push(token);

    token = new state.Token('poll_open', 'div', 1);
    token.block = true;
    header.push(token);

    token = new state.Token('poll_open', 'div', 1);
    token.attrs = [['class', 'poll-container']];

    header.push(token);

    // generate the options when the type is "number"
    if (attrs["type"] === "number") {
      // default values
      if (isNaN(min)) { min = 1; }
      if (isNaN(max)) { max = state.md.options.discourse.pollMaximumOptions; }
      if (isNaN(step)) { step = 1; }

      if (items.length > 0) {
        return invalidPoll(state, raw);
      }

      // dynamically generate options
      token = new state.Token('bullet_list_open', 'ul', 1);
      header.push(token);

      for (let o = min; o <= max; o += step) {
        token = new state.Token('list_item_open', 'li', 1);
        items.push([token,  String(o)]);
        header.push(token);

        token = new state.Token('text', '', 0);
        token.content = String(o);
        header.push(token);

        token = new state.Token('list_item_close', 'li', -1);
        header.push(token);
      }
      token = new state.Token('bullet_item_close', '', -1);
      header.push(token);
    }

    // flag items so we add hashes
    for (let o = 0; o < items.length; o++) {
      token = items[o][0];
      let text = items[o][1];

      token.attrs = token.attrs || [];
      let md5Hash = md5(JSON.stringify([text]));
      token.attrs.push([DATA_PREFIX + 'option-id', md5Hash]);
    }

    replaceToken(state.tokens, openToken, header);

    // we got to correct the level on the state
    // we just resequenced
    state.level = state.tokens[state.tokens.length-1].level;

    state.push('poll_close', 'div', -1);

    token = state.push('poll_open', 'div', 1);
    token.attrs = [['class', 'poll-info']];

    state.push('paragraph_open', 'p', 1);

    token = state.push('span_open', 'span', 1);
    token.block = false;
    token.attrs = [['class', 'info-number']];
    token = state.push('text', '', 0);
    token.content = '0';
    state.push('span_close', 'span', -1);

    token = state.push('span_open', 'span', 1);
    token.block = false;
    token.attrs = [['class', 'info-label']];
    token = state.push('text', '', 0);
    token.content = I18n.t("poll.voters", { count: 0 });
    state.push('span_close', 'span', -1);

    state.push('paragraph_close', 'p', -1);

    state.push('poll_close', 'div', -1);
    state.push('poll_close', 'div', -1);
    state.push('poll_close', 'div', -1);
  }
};

function newApiInit(helper) {
  helper.registerOptions((opts, siteSettings) => {
    opts.features.poll = !!siteSettings.poll_enabled;
    opts.pollMaximumOptions = siteSettings.poll_maximum_options;
  });

  helper.registerPlugin(md => {
    md.block.bbcode.ruler.push('poll', rule);
  });
}

export function setup(helper) {
  helper.whiteList([
    'div.poll',
    'div.poll-info',
    'div.poll-container',
    'div.poll-buttons',
    'div[data-*]',
    'span.info-number',
    'span.info-text',
    'span.info-label',
    'a.button.cast-votes',
    'a.button.toggle-results',
    'li[data-*]'
  ]);

  newApiInit(helper);

}

/*!
 * Joseph Myer's md5() algorithm wrapped in a self-invoked function to prevent
 * global namespace polution, modified to hash unicode characters as UTF-8.
 *
 * Copyright 1999-2010, Joseph Myers, Paul Johnston, Greg Holt, Will Bond <will@wbond.net>
 * http://www.myersdaily.org/joseph/javascript/md5-text.html
 * http://pajhome.org.uk/crypt/md5
 *
 * Released under the BSD license
 * http://www.opensource.org/licenses/bsd-license
 */
function md5cycle(x, k) {
  var a = x[0], b = x[1], c = x[2], d = x[3];

  a = ff(a, b, c, d, k[0], 7, -680876936);
  d = ff(d, a, b, c, k[1], 12, -389564586);
  c = ff(c, d, a, b, k[2], 17, 606105819);
  b = ff(b, c, d, a, k[3], 22, -1044525330);
  a = ff(a, b, c, d, k[4], 7, -176418897);
  d = ff(d, a, b, c, k[5], 12, 1200080426);
  c = ff(c, d, a, b, k[6], 17, -1473231341);
  b = ff(b, c, d, a, k[7], 22, -45705983);
  a = ff(a, b, c, d, k[8], 7, 1770035416);
  d = ff(d, a, b, c, k[9], 12, -1958414417);
  c = ff(c, d, a, b, k[10], 17, -42063);
  b = ff(b, c, d, a, k[11], 22, -1990404162);
  a = ff(a, b, c, d, k[12], 7, 1804603682);
  d = ff(d, a, b, c, k[13], 12, -40341101);
  c = ff(c, d, a, b, k[14], 17, -1502002290);
  b = ff(b, c, d, a, k[15], 22, 1236535329);

  a = gg(a, b, c, d, k[1], 5, -165796510);
  d = gg(d, a, b, c, k[6], 9, -1069501632);
  c = gg(c, d, a, b, k[11], 14, 643717713);
  b = gg(b, c, d, a, k[0], 20, -373897302);
  a = gg(a, b, c, d, k[5], 5, -701558691);
  d = gg(d, a, b, c, k[10], 9, 38016083);
  c = gg(c, d, a, b, k[15], 14, -660478335);
  b = gg(b, c, d, a, k[4], 20, -405537848);
  a = gg(a, b, c, d, k[9], 5, 568446438);
  d = gg(d, a, b, c, k[14], 9, -1019803690);
  c = gg(c, d, a, b, k[3], 14, -187363961);
  b = gg(b, c, d, a, k[8], 20, 1163531501);
  a = gg(a, b, c, d, k[13], 5, -1444681467);
  d = gg(d, a, b, c, k[2], 9, -51403784);
  c = gg(c, d, a, b, k[7], 14, 1735328473);
  b = gg(b, c, d, a, k[12], 20, -1926607734);

  a = hh(a, b, c, d, k[5], 4, -378558);
  d = hh(d, a, b, c, k[8], 11, -2022574463);
  c = hh(c, d, a, b, k[11], 16, 1839030562);
  b = hh(b, c, d, a, k[14], 23, -35309556);
  a = hh(a, b, c, d, k[1], 4, -1530992060);
  d = hh(d, a, b, c, k[4], 11, 1272893353);
  c = hh(c, d, a, b, k[7], 16, -155497632);
  b = hh(b, c, d, a, k[10], 23, -1094730640);
  a = hh(a, b, c, d, k[13], 4, 681279174);
  d = hh(d, a, b, c, k[0], 11, -358537222);
  c = hh(c, d, a, b, k[3], 16, -722521979);
  b = hh(b, c, d, a, k[6], 23, 76029189);
  a = hh(a, b, c, d, k[9], 4, -640364487);
  d = hh(d, a, b, c, k[12], 11, -421815835);
  c = hh(c, d, a, b, k[15], 16, 530742520);
  b = hh(b, c, d, a, k[2], 23, -995338651);

  a = ii(a, b, c, d, k[0], 6, -198630844);
  d = ii(d, a, b, c, k[7], 10, 1126891415);
  c = ii(c, d, a, b, k[14], 15, -1416354905);
  b = ii(b, c, d, a, k[5], 21, -57434055);
  a = ii(a, b, c, d, k[12], 6, 1700485571);
  d = ii(d, a, b, c, k[3], 10, -1894986606);
  c = ii(c, d, a, b, k[10], 15, -1051523);
  b = ii(b, c, d, a, k[1], 21, -2054922799);
  a = ii(a, b, c, d, k[8], 6, 1873313359);
  d = ii(d, a, b, c, k[15], 10, -30611744);
  c = ii(c, d, a, b, k[6], 15, -1560198380);
  b = ii(b, c, d, a, k[13], 21, 1309151649);
  a = ii(a, b, c, d, k[4], 6, -145523070);
  d = ii(d, a, b, c, k[11], 10, -1120210379);
  c = ii(c, d, a, b, k[2], 15, 718787259);
  b = ii(b, c, d, a, k[9], 21, -343485551);

  x[0] = add32(a, x[0]);
  x[1] = add32(b, x[1]);
  x[2] = add32(c, x[2]);
  x[3] = add32(d, x[3]);
}

function cmn(q, a, b, x, s, t) {
  a = add32(add32(a, q), add32(x, t));
  return add32((a << s) | (a >>> (32 - s)), b);
}

function ff(a, b, c, d, x, s, t) {
  return cmn((b & c) | ((~b) & d), a, b, x, s, t);
}

function gg(a, b, c, d, x, s, t) {
  return cmn((b & d) | (c & (~d)), a, b, x, s, t);
}

function hh(a, b, c, d, x, s, t) {
  return cmn(b ^ c ^ d, a, b, x, s, t);
}

function ii(a, b, c, d, x, s, t) {
  return cmn(c ^ (b | (~d)), a, b, x, s, t);
}

function md51(s) {
  // Converts the string to UTF-8 "bytes" when necessary
  if (/[\x80-\xFF]/.test(s)) {
    s = unescape(encodeURI(s));
  }
  var n = s.length, state = [1732584193, -271733879, -1732584194, 271733878], i;
  for (i = 64; i <= s.length; i += 64) {
    md5cycle(state, md5blk(s.substring(i - 64, i)));
  }
  s = s.substring(i - 64);
  var tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
  for (i = 0; i < s.length; i++)
  tail[i >> 2] |= s.charCodeAt(i) << ((i % 4) << 3);
  tail[i >> 2] |= 0x80 << ((i % 4) << 3);
  if (i > 55) {
    md5cycle(state, tail);
    for (i = 0; i < 16; i++) tail[i] = 0;
  }
  tail[14] = n * 8;
  md5cycle(state, tail);
  return state;
}

function md5blk(s) { /* I figured global was faster.   */
  var md5blks = [], i; /* Andy King said do it this way. */
  for (i = 0; i < 64; i += 4) {
    md5blks[i >> 2] = s.charCodeAt(i) +
                      (s.charCodeAt(i + 1) << 8) +
                      (s.charCodeAt(i + 2) << 16) +
                      (s.charCodeAt(i + 3) << 24);
  }
  return md5blks;
}

var hex_chr = '0123456789abcdef'.split('');

function rhex(n) {
  var s = '', j = 0;
  for (; j < 4; j++)
  s += hex_chr[(n >> (j * 8 + 4)) & 0x0F] +
       hex_chr[(n >> (j * 8)) & 0x0F];
  return s;
}

function hex(x) {
  for (var i = 0; i < x.length; i++)
  x[i] = rhex(x[i]);
  return x.join('');
}

function add32(a, b) {
  return (a + b) & 0xFFFFFFFF;
}

function md5(s) {
  return hex(md51(s));
}