export function inline_cite_short(keys){
  function cite_string(key){
    if (key in data.bibliography){
      var n = data.citations.indexOf(key)+1;
      return ""+n;
    } else {
      return "?";
    }
  }
  return "["+keys.map(cite_string).join(", ")+"]";
}

export function inline_cite_long(keys){
  function cite_string(key){
    if (key in data.bibliography){
      var ent = data.bibliography[key];
      var names = ent.author.split(" and ");
      names = names.map(name => name.split(",")[0].trim())
      var year = ent.year;
      if (names.length == 1) return names[0] + ", " + year;
      if (names.length == 2) return names[0] + " & " + names[1] + ", " + year;
      if (names.length  > 2) return names[0] + ", et al., " + year;
    } else {
      return "?";
    }
  }
  return keys.map(cite_string).join(", ");
}

function author_string(ent, template, sep, finalSep){
  var names = ent.author.split(" and ");
  let name_strings = names.map(name => {
    name = name.trim();
    if (name.indexOf(",") != -1){
      var last = name.split(",")[0].trim();
      var firsts = name.split(",")[1];
    } else {
      var last = name.split(" ").slice(-1)[0].trim();
      var firsts = name.split(" ").slice(0,-1).join(" ");
    }
    var initials = "";
    if (firsts != undefined) {
      initials = firsts.trim().split(" ").map(s => s.trim()[0]);
      initials = initials.join(".")+".";
    }
    return template.replace("${F}", firsts)
                   .replace("${L}", last)
                   .replace("${I}", initials);
  });
  if (names.length > 1) {
    var str = name_strings.slice(0, names.length-1).join(sep);
    str += (finalSep || sep) + name_strings[names.length-1];
    return str;
  } else {
    return name_strings[0];
  }
}

function venue_string(ent) {
  var cite = (ent.journal || ent.booktitle || "")
  if ("volume" in ent){
    var issue = ent.issue || ent.number;
    issue = (issue != undefined)? "("+issue+")" : "";
    cite += ", Vol " + ent.volume + issue;
  }
  if ("pages" in ent){
    cite += ", pp. " + ent.pages
  }
  if (cite != "") cite += ". "
  if ("publisher" in ent){
    cite += ent.publisher;
    if (cite[cite.length-1] != ".") cite += ".";
  }
  return cite;
}

function link_string(ent){
  if ("url" in ent){
    var url = ent.url;
    var arxiv_match = (/arxiv\.org\/abs\/([0-9\.]*)/).exec(url);
    if (arxiv_match != null){
      url = `http://arxiv.org/pdf/${arxiv_match[1]}.pdf`;
    }

    if (url.slice(-4) == ".pdf"){
      var label = "PDF";
    } else if (url.slice(-5) == ".html") {
      var label = "HTML";
    }
    return ` &ensp;<a href="${url}">[${label||"link"}]</a>`;
  }/* else if ("doi" in ent){
    return ` &ensp;<a href="https://doi.org/${ent.doi}" >[DOI]</a>`;
  }*/ else {
    return "";
  }
}
function doi_string(ent, new_line){
  if ("doi" in ent) {
    return `${new_line?"<br>":""} <a href="https://doi.org/${ent.doi}" style="text-decoration:inherit;">DOI: ${ent.doi}</a>`;
  } else {
    return "";
  }
}

export function bibliography_cite(ent, fancy){
  if (ent){
    var cite =  "<b>" + ent.title + "</b> "
    cite += link_string(ent) + "<br>";
    cite += author_string(ent, "${L}, ${I}", ", ", " and ");
    if (ent.year || ent.date){
      cite += ", " + (ent.year || ent.date) + ". "
    } else {
      cite += ". "
    }
    cite += venue_string(ent);
    cite += doi_string(ent);
    return cite
    /*var cite =  author_string(ent, "${L}, ${I}", ", ", " and ");
    if (ent.year || ent.date){
      cite += ", " + (ent.year || ent.date) + ". "
    } else {
      cite += ". "
    }
    cite += "<b>" + ent.title + "</b>. ";
    cite += venue_string(ent);
    cite += doi_string(ent);
    cite += link_string(ent);
    return cite*/
  } else {
    return "?";
  }
}

export function hover_cite(ent){
  if (ent){
    var cite = "";
    cite += "<b>" + ent.title + "</b>";
    cite += link_string(ent);
    cite += "<br>"

    var a_str = author_string(ent, "${I} ${L}", ", ") + ".";
    var v_str = venue_string(ent).trim() + " " + ent.year + ". " + doi_string(ent, true);

    if ((a_str+v_str).length < Math.min(40, ent.title.length)) {
      cite += a_str + " " + v_str;
    } else {
      cite += a_str + "<br>" + v_str;
    }
    return cite;
  } else {
    return "?";
  }
}


//https://scholar.google.com/scholar?q=allintitle%3ADocument+author%3Aolah
function get_GS_URL(ent){
  if (ent){
    var names = ent.author.split(" and ");
    names = names.map(name => name.split(",")[0].trim())
    var title = ent.title.split(" ")//.replace(/[,:]/, "")
    var url = "http://search.labs.crossref.org/dois?"//""https://scholar.google.com/scholar?"
    url += uris({q: names.join(" ") + " " + title.join(" ")})
  }
}