'use strict';


module.exports = function footnote_block(state) {
  var i, l, t, list, tokens, current, currentLabel, anchor,
      level = 0,
      insideRef = false,
      refTokens = Object.create(null);

  if (!state.env.footnotes) { return; }

  state.tokens = state.tokens.filter(function(tok) {
    if (tok.type === 'footnote_reference_open') {
      insideRef = true;
      current = [];
      currentLabel = tok.label;
      return false;
    }
    if (tok.type === 'footnote_reference_close') {
      insideRef = false;
      refTokens[currentLabel] = current;
      return false;
    }
    if (insideRef) { current.push(tok); }
    return !insideRef;
  });

  if (!state.env.footnotes.list) { return; }
  list = state.env.footnotes.list;

  state.tokens.push({
    type: 'footnote_block_open',
    level: level++
  });
  for (i = 0, l = list.length; i < l; i++) {
    state.tokens.push({
      type: 'footnote_open',
      id: i,
      level: level++
    });

    if (list[i].tokens) {
      tokens = [];
      tokens.push({
        type: 'paragraph_open',
        tight: false,
        level: level++
      });
      tokens.push({
        type: 'inline',
        content: '',
        level: level,
        children: list[i].tokens
      });
      tokens.push({
        type: 'paragraph_close',
        tight: false,
        level: --level
      });
    } else if (list[i].label) {
      tokens = refTokens[list[i].label];
    }

    anchor = {
      type: 'footnote_anchor',
      id: i,
      level: level
    };

    state.tokens = state.tokens.concat(tokens);
    if (state.tokens[state.tokens.length - 1].type === 'paragraph_close') {
      t = state.tokens.pop();
      state.tokens.push(anchor);
      state.tokens.push(t);
    } else {
      state.tokens.push(anchor);
    }

    state.tokens.push({
      type: 'footnote_close',
      level: --level
    });
  }
  state.tokens.push({
    type: 'footnote_block_close',
    level: --level
  });
};