//        _
//       (_)________  ____
//      / / ___/ __ \/ __ \
//     / (__  ) /_/ / / / /
//  __/ /____/\____/_/ /_/
// /___/

module.exports = {
  lang:'fr',
  langs:[
    {'lc':'lat',  'label':'Latin',  'db':'0-LAT-ethicadb.json'},
    {'lc':'fr',   'label':'Français',   'db':'2-Appuhn-FR-ethicadb.json'},
    {'lc':'bra',  'label':'Brazilian',  'db':'ethica-bresilen.json'},
    {'lc':'en',   'label':'English',   'db':'3-Elwes-EN-ethicadb.json'}
  ],
  data:[],
  loaded_dbs:0,
  data_byid:[],
  data_strct:{},
  load: function(callback) {
    // load all dbs, when all loaded call main app callback function
    for (var i = 0; i < this.langs.length; i++) {
      this.loadJSON(this.langs[i].lc, '/assets/jsondb/'+this.langs[i].db, callback)
    }
  },
  loadJSON: function(lc, file, callback){

    var xobj = new XMLHttpRequest();
    xobj.overrideMimeType("application/json");
    // TODO: load and unzip gziped json
    // xobj.setRequestHeader('Accept-Encoding', 'gzip');
    xobj.onreadystatechange = function () {
      // console.log('onreadystatechange', xobj.readyState);
      switch(xobj.readyState){
        case 3:
          console.log('loading');
        break;
        case 4:
          if (xobj.status === 200) {
              this.onJSONLoaded(lc, xobj.responseText, callback);
          } else {
              console.log("Status de la réponse: %d (%s)", xobj.status, xobj.statusText);
          }
        break;
      }
    }.bind(this);

    xobj.open('GET', file, true);
    xobj.send(null);
  },
  onJSONLoaded: function(lc, json, callback){
    console.log('onDBLoaded '+lc);
    this.data[lc] = JSON.parse(json);
    this.loaded_dbs ++;
    //
    if (this.loaded_dbs == this.langs.length) {
      this.parseByID(callback);
    }

  },
  parseByID: function(callback){
    for(l in this.data){
      // console.log('l', l);
      this.data_byid[l] = {};
      for (p in this.data[l]) {
        // console.log(this.data[l][p]);
        for (e in this.data[l][p].enonces) {
          // console.log('e',e);
          this.data_byid[l][this.data[l][p].enonces[e].id] = this.data[l][p].enonces[e];
          for (c in this.data[l][p].enonces[e].childs){
            // console.log(_db[p][e][c]);
            this.data_byid[l][this.data[l][p].enonces[e].childs[c].id] = this.data[l][p].enonces[e].childs[c];
          }
        }
      }
    }
    // console.log('this.data_byid', this.data_byid);
    this.parseStrct(callback);
  },
  parseStrct: function(callback){

    var id, item, obj, links_match, link, tid;
    for (id in this.data_byid[this.langs[0].lc]) {
      item = this.data_byid[this.langs[0].lc][id];
      // console.log(item);
      // skeep titles as they don't have structure data
      if(item.type == "title") continue;

      obj = {
        'to':[],
        'from':[],
      };
      // get links
      links_match = item.text.match(/\[[^\]]+\]\([^\)]+\)/g);
      // console.log(links_match);
      // if links exist on text
      if(links_match){
        for(link of links_match){
          // console.log(link);
          // get the target id
          tid = link.match(/\((.+)\)/)[1];
          // avoid duplicates
          if (obj.to.indexOf(tid) == -1)
            obj.to.push(tid);

          // add id to "from" links in target
          // if target exists
          if(typeof this.data_strct[tid] !== 'undefined'){
            // avoid duplicates
            if (this.data_strct[tid].from.indexOf(tid) == -1)
              this.data_strct[tid].from.push(id);
          }else{
            // if targets does not exists, the db has an issue, warn about that
            console.log('!! warning : '+tid+' target id does not exists');
          }
        }
      }
      // add the item links to the main links listings
      this.data_strct[id] = obj;
    }
    // console.log('data_strct',this.data_strct);

    callback();
  }
}