//        _     _                _     
// __   _(_) __| | ___  ___     (_)___ 
// \ \ / / |/ _` |/ _ \/ _ \    | / __|
//  \ V /| | (_| |  __/ (_) |   | \__ \
//   \_/ |_|\__,_|\___|\___/   _/ |___/
//                            |__/     
//
// JavaScript code for handling indexes of videos,
// possibly with links to local copies in MP4 format
// From: http://angg.twu.net/blogme3/local-videos-mini.js.html
//                    (find-blogme3 "local-videos-mini.js")
// See:  http://angg.twu.net/ferramentas-para-ativistas.html
//                 (find-TH "ferramentas-para-ativistas")
//       http://angg.twu.net/linkdasruas.html
// Author: Eduardo Ochs <eduardoochs@gmail.com>
// Version: 2014jul13
//
eltbyid       = function (id)      { return document.getElementById(id); }
from_textarea = function (id)      { return eltbyid(id).value; }
from_pre      = function (id)      { return eltbyid(id).innerHTML; }
to_textarea   = function (id, txt) { eltbyid(id).innerHTML = txt; }
to_pre        = function (id, txt) { eltbyid(id).innerHTML = txt; }

function href0 (tgt, text) { return '<a href="'+tgt+'">' + text + '</a>'; }
function href  (tgt, text) { return tgt ? href0(tgt, text) : text; }

// escape_re    = /[\x0f&<>"']/g;
// escape_table = {
//   '&': '&amp;',
//   '<': '&lt;',
//   '>': '&gt;',
//   '"': '&quot;',
//   "'": '&#x27;',
//   "\x0f": '<font color="red"><strong>*</strong></font>'
// }
escape_re    = /[\x0f]/g;
escape_table = {
  "\x0f": '<font color="red"><strong>*</strong></font>'
}
escape = function (str) {
  return str.replace(escape_re, function (c) {
      return escape_table[c] || c;
    });
}

yt_mp4s = {}
yt_mp4_re  = /(...........)\.mp4$/
yt_hash_re = /[?&]v=([^ &]+)/
yt_line_re = /^(.*)(https?:\/\/www.youtube[^ ]*)( *)(.*)$/

function yt_extract_mp4s(bigstr) { // process and remove the mp4 lines from str
  var f = function (line) { 
    line = line.replace(/\n/g, "");
    var A = line.match(yt_mp4_re);
    if (A) {
      yt_mp4s[A[1]] = line;   // put in yt_mp4a
      return "";
    } else {
      return line + "\n";
    }
  }
  // f = function (s) { var p = "("+s+")"; alert(p); return p; }
  return bigstr.replace(/([^\n]+)\n/g, f);
}
function yt_hash (str) {
  var A = str.match(yt_hash_re);
  if (A) { return A[1]; }
}
function yt_line_parse (str) {
  var A = str.match(yt_line_re);
  if (A) {
    var all=A[0], a=A[1], url=A[2], b=A[3], title=A[4];
    var hash = yt_hash(url);
    if (hash) {
      return {'all':all, 'a':a, 'url':url, 'b':b, 'title':title, 'hash':hash};
    }
  }
}

function yt_url         (hash) { return "http://www.youtube.com/watch?v="+hash; }
function yt_ytlink_html (hash) { return "("+href(yt_url(hash), "YT")+")"; }
function yt_title_html  (h, t) { return href(yt_mp4s[h], escape(t)); }
function yt_line_html   (line) {
  var A = yt_line_parse(line)
  if (A) {
    return A.a + yt_ytlink_html(A.hash) + A.b + yt_title_html(A.hash, A.title);
  }
}

url_line_re = /^(.*)(https?:\/\/[!-~]*)(.*)$/
url_line_html = function (line) {
  var A = line.match(url_line_re);
  if (A) {
    var all=A[0], a=A[1], url=A[2], b=A[3];
    return escape(a)+href(url, url)+escape(b);
  }
}

yt_htmlize0 = function (bigstr) {
  var f = function (li) {
    return yt_line_html(li) || url_line_html(li) || li;
  }
  return yt_extract_mp4s(bigstr).replace(/[^\n]+/g, f);
}
yt_htmlize = function (bigstr) { yt_mp4s={}; return yt_htmlize0(bigstr); }

yt_htmlize_pre = function (pre_id) {
  to_pre(pre_id, yt_htmlize(from_pre(pre_id)));
}

// Typical uses:
// to_pre('output_a',yt_htmlize(from_textarea('input_a')));
// to_pre('my_pre_a',yt_htmlize(from_pre('my_pre_a')));

// youtube_activate0 = function (bigstr, f) {
//   return bigstr.replace(/[^\n]+/g, (f || youtube_line));
// }
// youtube_activate = function (id, f) {
//   var elt = document.getElementById(id);
//   // elt.innerHTML = youtube_activate0(elt.innerText, f);
//   elt.innerHTML = youtube_activate0(elt.textContent, f);
// }