/**
 * @Author: Bachir Soussi Chiadmi <bach>
 * @Date:   18-12-2017
 * @Email:  bachir@figureslibres.io
 * @Filename: corpus.js
 * @Last modified by:   bach
 * @Last modified time: 20-12-2017
 * @License: GPL-V3
 */

// JS performance improvement http://archive.oreilly.com/pub/a/server-administration/excerpts/even-faster-websites/writing-efficient-javascript.html

/**
  * depends on :
  * physics.js : http://jonobr1.com/Physics/#
  */

(function($, Drupal, drupalSettings) {

  EdlpCorpus = function(){
    var _activated = true;
    var _$body = $('body');
    var _$container = _$body;
    var _$canvas = $('<canvas id="corpus-map">').appendTo(_$container);
    var _canvas = _$canvas[0];
    var _ctx = _canvas.getContext('2d');
    var _dpi = window.devicePixelRatio;
    var _is_expo = $('body').hasClass('domain-expo-encyclopediedelaparole-org');
    var _scene_props = {
      width:window.innerWidth,
      height:window.innerHeight,
      // 'margin_top':90, // with red border on head
      'margin_top': _is_expo ? 0 : 75, // without red border on head
      // 'margin_top':0,
      'margin_right':0,
      'margin_bottom': _is_expo ? 0 : 65,
      // 'margin_bottom':0,
      'margin_left':0
    };
    var _evolution_zone = {
      left:_scene_props.width/4,
      right:_scene_props.width - _scene_props.width/4,
      center:_scene_props.width/2,
    };

    var _physics = new Physics();
    var _nodes = [];
    var _articles_nodes = [];
    var _no_articles_nodes = [];
    // var _articles_filter_on = false;
    var _nodes_by_entries = {};
    var _nodes_by_nid = {};
    var _nodes_Nid_Id = {};
    var _nodes_centered = [];
    var _nodes_centered_attractions = [];

    var _loaded = false;

    var _playlist = [];

    var _p_velocity_factor = 0.5;
    var _mouse_in = true;
    var _m_pos = {x:0, y:0};
    var _node_hover_id = -1;
    var _node_opened_id = -1;
    var _$entrees_block = $('#block-edlpentreesblock');
    var _$entrees_block_termlinks = $('a.term-link', _$entrees_block);
    var _$articles_link;
    var _node_pop_up;
    // Colors depend on drupalSettings loaded by edlp_corpus.module
    var _settings = drupalSettings.edlp_corpus;
    var _ecolors = _settings.colors;
    // Physics
    var _attracter;

    var check_parts_colid_frq = 2;
    var check_parts_colid_tick = 1;

    //     ____      _ __
    //    /  _/___  (_) /______
    //    / // __ \/ / __/ ___/
    //  _/ // / / / / /_(__  )
    // /___/_/ /_/_/\__/____/
    function init(){
      console.log("Corpus init()");
      initCanvas();
      if(_activated){
        loadCorpus();
      }else{
        _$canvas.addClass('de-activated');
      }
    };

    //   ___
    //  / __|__ _ _ ___ ____ _ ___
    // | (__/ _` | ' \ V / _` (_-<
    //  \___\__,_|_||_\_/\__,_/__/
    function initCanvas(){
      // resize the canvas to fill browser window dynamically
      window.addEventListener('resize', onResizeCanvas, false);
      onResizeCanvas();
    };
    function onResizeCanvas() {
      // _dpi = 2;
      _scene_props.width = window.innerWidth;
      _scene_props.height = window.innerHeight;
      _canvas.style.width = _scene_props.width+'px';
      _canvas.style.height = _scene_props.height+'px';
      _canvas.width = _scene_props.width*_dpi;
      _canvas.height = _scene_props.height*_dpi;
      _ctx.scale(_dpi, _dpi);

      moveEvolutionZone();

      if(_loaded){
        for (var i = 0; i < _nodes.length; i++) {
          _nodes[i].onResizeCanvas();
        }
        // move _attracter and _repulser to their right places again
        // moveEvolutionZone() will trigger resizePhysics()
        // resizePhysics();
      }

    };

    //   ___
    //  / __|___ _ _ _ __ _  _ ___
    // | (__/ _ \ '_| '_ \ || (_-<
    //  \___\___/_| | .__/\_,_/__/
    //              |_|
    function loadCorpus(){
      // console.log('drupalSettings',drupalSettings);
      // console.log('window.location', window.location);
      // var path = window.location.origin + drupalSettings.basepath + "edlp/corpus";
      var ajax_path = _settings.load_corpus_ajax_url;
      var path = window.location.origin + Drupal.url(ajax_path);
      $.getJSON(path, {})
        .done(function(data){
          onCorpusLoaded(data);
        })
        .fail(function(jqxhr, textStatus, error){
          onCorpusLoadError(jqxhr, textStatus, error);
        });
    };
    function onCorpusLoadError(jqxhr, textStatus, error){
      console.warn('corpus load failed', jqxhr.responseText);
    };
    function onCorpusLoaded(data){
      console.log('corpus loaded : data', data);
      // console.log('first node', data.nodes[0]);
      // buildParticles(data.nodes);
      initPhysics();
      buildNodes(data.nodes);
      initArtilesLink();
      initNodePopup();
      initEvents();
      checkPreOpenedEntry();
      startAnime();
      _loaded = true;
    };

    //  ___ _           _
    // | _ \ |_ _  _ __(_)__ ___
    // |  _/ ' \ || (_-< / _(_-<
    // |_| |_||_\_, /__/_\__/__/
    //          |__/
    function initPhysics(){
      _attracter = _physics.makeParticle(1000);
      _attracter.fixed = true;
      // move _attracter on window resize
      resizePhysics();
    };
    function resizePhysics(){
      // attracters
      if(typeof _attracter != 'undefined'){
        _attracter.position = {x:_evolution_zone.center, y:_scene_props.height/2};
      }
    };

    //  _  _         _
    // | \| |___  __| |___ ___
    // | .` / _ \/ _` / -_|_-<
    // |_|\_\___/\__,_\___/__/
    function buildNodes(nodes){
      // console.log("buildNodes", nodes);
      var d;
      for (var i in nodes) {
        d = i < 1 ? true : false;
        // _nodes.push(new Node(i,nodes[i],d));
        new Node(i,nodes[i],d);

        _playlist.push({
          'id':i,
          'nid':nodes[i].nid,
          'audio_url':nodes[i].audio_url,
          'document_url':nodes[i].document_url,
        });
      }
    };

    function Node(i,node,d){
      this.id = i;
      for(key in node)
        this[key] = node[key];

      // record the node in different lists
      _nodes.push(this);

      _nodes_by_nid[this.nid] = this;
      _nodes_Nid_Id[this.nid] = this.id;

      if(this.has_article == 1){
        _articles_nodes.push(this);
      }else{
        _no_articles_nodes.push(this);
      }

      for (var j = 0; j < this.entrees.length; j++) {
        if(typeof _nodes_by_entries[this.entrees[j]] == 'undefined')
          _nodes_by_entries[this.entrees[j]] = [];

        _nodes_by_entries[this.entrees[j]].push(this);
      }

      this.debug = d;
      this.mass = Math.max(1, this.entrees.length); //1;
      this.velocity_threshold = 0.01;
      // define radius regarding entries length
      switch(true){
        case this.entrees.length > 3:
          this.r = 8;//10;
          break;
        case this.entrees.length > 1 && this.entrees.length <= 3:
          this.r = 5;//7;
          break;
        default:
          this.r = 3;//4;
          break;
      }
      this.d = this.r*2;

      this.e_color = 'e_col_'+this.entrees[Math.floor(Math.random(this.entrees.length))];

      // pre-rendering node virtual canvas
      this.canvas = document.createElement('canvas');
      this.canvas_ctx = this.canvas.getContext('2d');
      this.line_width = 1;
      this.w = this.r*2+this.line_width*2;
      this.w_2 = this.w/2;
      this.canvas.width = this.w;
      this.canvas.height = this.w;
      this.canvas_ctx.fillStyle = 'rgb(255,255,255)';
      this.canvas_ctx.lineWidth = this.line_width;

      this.wall_bouncing_elasticity = 0.75;

      // node states
      this.hover = false;
      this.opened = false;
      this.faded = false;
      this.center = false;
      this.aside = false;
      this.scrambling = false;

      // prototypes
      if (typeof Node.initialized == "undefined") {

        Node.prototype.init = function(){
          this.calcWallLimits();

          this.x = this.wall_limits.left + Math.random()*(this.wall_limits.right - this.wall_limits.left);
          this.y = this.wall_limits.top  + Math.random()*(this.wall_limits.bottom - this.wall_limits.top);

          this.ori_pos = {x:this.x,y:this.y};
          // TODO: don't forget to move ori_pos on window resize

          //this.drawSprite();
          this.initPhysics();
        };

        // Node.prototype.drawSprite = function(){
        //   _ctx.clearRect(0, 0, this.w, this.w);
        //
        //   this.canvas_ctx.beginPath();
        //   // white background
        //   this.canvas_ctx.fillRect(0,0,this.w,this.w);
        //
        //   this.canvas_ctx.globalAlpha = this.faded ? 0.15 : 1;
        //
        //   if(this.opened){
        //     // carre plein
        //     // this.canvas_ctx.lineWidth = '1px';
        //     // this.canvas_ctx.strokeStyle = 'rgb(255,0,0)';
        //     // this.canvas_ctx.strokeRect(this.x - this.r-3,this.y - this.r-3,this.r*2+6,this.r*2+6);
        //     // ou carre contour
        //     this.canvas_ctx.save(); // save the normal context state (fill white)
        //     this.canvas_ctx.fillStyle = _ecolors[this.e_color];
        //     this.canvas_ctx.fillRect(this.line_width,this.line_width,this.d,this.d);
        //     this.canvas_ctx.restore(); // restore the normal context state (fill white)
        //   }
        //   // else{
        //   //   // carre plein
        //   //   // this.canvas_ctx.fillStyle = _ecolors[this.e_color];
        //   //   // this.canvas_ctx.fillRect(this.x - this.r,this.y - this.r,this.d,this.d);
        //   //   // ou carre contour
        //   //   this.canvas_ctx.fillRect(this.line_width,this.line_width,this.d,this.d);
        //   // }
        //   this.canvas_ctx.strokeStyle = _ecolors[this.e_color];
        //   this.canvas_ctx.strokeRect(this.line_width,this.line_width,this.d,this.d);
        //   // this.canvas_ctx.globalAlpha = 1;
        //   this.canvas_ctx.closePath();
        // };

        Node.prototype.initPhysics = function(){
          // particule
          this.p = _physics.makeParticle(this.mass, this.x, this.y);
          this.p.velocity = new Physics.Vector((Math.random()-0.5)*_p_velocity_factor, (Math.random()-0.5)*_p_velocity_factor);
          // origin position particule
          this.ori_p = _physics.makeParticle(1000, this.ori_pos.x, this.ori_pos.y);
          this.ori_p.fixed = true;
          // TODO: don't forget to move ori_p on window resize
          this.ori_p_attract = _physics.makeAttraction(this.ori_p, this.p, 1000, _scene_props.width*2);
          this.ori_p_attract.on = false;
          // attracter
          this.attract = _physics.makeAttraction(_attracter, this.p, 1000, _scene_props.width*2);
          this.attract.on = false;
        };

        Node.prototype.calcWallLimits = function(){
          this.wall_limits = {
            top:    _scene_props.margin_top  +this.r,
            right:  _scene_props.width  -_scene_props.margin_right  -this.r,
            bottom: _scene_props.height -_scene_props.margin_bottom -this.r,
            left:   _scene_props.margin_left +this.r
          }
        };

        Node.prototype.onResizeCanvas = function(){
          this.calcWallLimits();
          // TODO: scramble only if not aside or centered
          this.shuffleOriP();
        };

        Node.prototype.shuffleOriP = function(){
          this.ori_pos.x = this.wall_limits.left + Math.random()*(this.wall_limits.right - this.wall_limits.left);
          this.ori_pos.y = this.wall_limits.top  + Math.random()*(this.wall_limits.bottom - this.wall_limits.top);
          this.scramble();
        };

        Node.prototype.onUpdate = function(){

          // this.p.velocity.multiplyScalar(0.99);
          if(this.hover || this.opened){
            this.p.fixed = true;
          }else{
            this.p.fixed = false;

            if(this.center)
            this.limitEvolutionZone();

            // if(!this.p.resting()){
            // this.checkVelocityThreshold();
            this.checkWallBouncing();
            this.updatePos();
            if(this.scrambling){
              this.checkOriPDist();
            }
            // }
          }

          if(_mouse_in && !this.aside && !this.faded)
            this.checkMouse();

          // this.move();
          this.redraw();
        };

        Node.prototype.checkVelocityThreshold = function(){
          if(!this.centered || !this.aside){
            if (Math.abs(this.p.velocity.x) < this.velocity_threshold
            && Math.abs(this.p.velocity.y) < this.velocity_threshold){
              this.p.velocity.multiplyScalar(0);
              // this.p.makeFixed();
            }
          }
        };

        Node.prototype.checkWallBouncing = function(){
          switch(true){
            case this.x < this.wall_limits.left && this.p.velocity.x < 0:
              this.p.position.x = this.wall_limits.left;
              this.p.velocity
                .multiplyScalarXY(-1, 1)
                .multiplyScalar(this.wall_bouncing_elasticity);
              break;
            case this.x > this.wall_limits.right && this.p.velocity.x > 0:
              this.p.position.x = this.wall_limits.right;
              this.p.velocity
                .multiplyScalarXY(-1, 1)
                .multiplyScalar(this.wall_bouncing_elasticity);
              break;
            case this.y < this.wall_limits.top && this.p.velocity.y < 0 :
              this.p.position.y = this.wall_limits.top;
              this.p.velocity
                .multiplyScalarXY(1,-1)
                .multiplyScalar(this.wall_bouncing_elasticity);
              break;
            case this.y > this.wall_limits.bottom && this.p.velocity.y > 0 :
              this.p.position.y = this.wall_limits.bottom;
              this.p.velocity
                .multiplyScalarXY(1,-1)
                .multiplyScalar(this.wall_bouncing_elasticity);
              break;
          }
        };

        Node.prototype.updatePos = function(){
          this.x = this.p.position.x;
          this.y = this.p.position.y;
        };

        Node.prototype.checkMouse = function(){

          if( _m_pos.x > this.x - this.r
           && _m_pos.x < this.x + this.r
           && _m_pos.y > this.y - this.r
           && _m_pos.y < this.y + this.r){
            if(_node_hover_id == -1 || _node_hover_id !== this.id){
              // console.log("Node hover", this.id);
              this.setHover();
            }
          }else{
            this.unsetHover();
          }
        };

        Node.prototype.setHover = function(){
          this.hover = true;
          _node_hover_id = this.id;
          _node_pop_up.setNode(this);
        };
        Node.prototype.unsetHover = function(){
          this.hover = false;
          if (_node_hover_id == this.id) {
            _node_hover_id = -1;
            _node_pop_up.removeNode();
          }
        };

        Node.prototype.open = function(){
          this.opened = true;
          _node_opened_id = this.id;
          //this.drawSprite();
        };
        Node.prototype.close = function(){
          this.opened = false;
          //this.drawSprite();
        };

        Node.prototype.fade = function(){
          this.faded = true;
          //this.drawSprite();
        };
        Node.prototype.unFade = function(){
          this.faded = false;
          //this.drawSprite();
        };

        Node.prototype.setCenteredOnEntree = function(tid){
          this.e_color = 'e_col_'+tid;
          this.setCentered();
        };

        Node.prototype.setCentered = function(){
          this.center = true;
          this.stopScrambling();
          this.unsetAside();
          this.attract.on = true;
          //this.drawSprite();
        }
        Node.prototype.unsetCentered = function(){
          this.center = false;
          this.attract.on = false;
        }

        Node.prototype.limitEvolutionZone = function(){
          // smouthly slow down node near center
          // if(this.id == 1)
          //   console.log('this.p.velocity', this.p.velocity);
          this.dist_to_attracter = this.p.distanceTo(_attracter);
          if( this.dist_to_attracter < _scene_props.width/4){
            if( this.p.velocity.length() > 0.4 ){
              this.p.velocity.multiplyScalar(0.99); // 0.995
            }
          }
          // limit evolution zone
          // if( Math.abs(_attracter.position.x - this.x) > _scene_props.width/4
          //     || Math.abs(_attracter.position.y - this.y) > _scene_props.height/4){
          if( this.x < _evolution_zone.left || this.x > _evolution_zone.right
              || Math.abs(_attracter.position.y - this.y) > _scene_props.height/4){
            this.attract.on = true;
          }else{
            this.attract.on = false;
          }
        }

        Node.prototype.setAside = function(){
          this.aside = true;
          // this.fade();
          this.stopScrambling();
          this.unsetCentered();
          this.ori_p.position.x = this.x < _scene_props.width /2 ? this.wall_limits.left : this.wall_limits.right;
          this.ori_p_attract.on = true;
          this.wall_bouncing_elasticity = 0.15;
        }
        Node.prototype.unsetAside = function(){
          // console.log('unsetAside');
          this.aside = false;
          this.ori_p_attract.on = false;
          this.ori_p.position.x = this.ori_pos.x;
          this.wall_bouncing_elasticity = 0.75;
          // this.unFade();
        }

        Node.prototype.resolveNormalPos = function(){
          // console.log("resolveNormalPos");
          switch(true){
            case this.center:
              this.unsetCentered();
              break;
            case this.aside:
              this.unsetAside();
              break;
          }
        };

        Node.prototype.scramble = function(){
          this.scrambling = true;
          this.unsetCentered();
          this.unsetAside();
          this.ori_p.position.x = this.ori_pos.x;
          this.ori_p.position.y = this.ori_pos.y;
          this.ori_p_attract.on = true;
        }
        Node.prototype.checkOriPDist = function(){
          if(this.p.distanceTo(this.ori_p) < 50){
            this.stopScrambling();
          }
        };
        Node.prototype.stopScrambling = function(){
          this.scrambling = false;
          this.ori_p_attract.on = false;
          // this.scramble_TL.on = false;
          // this.scramble_TR.on = false;
          // this.scramble_BR.on = false;
          // this.scramble_BL.on = false;
          // this.scramble_CR.on = false;
          // this.scramble_CL.on = false;
        }

        Node.prototype.move = function(){
          // just draw the virtual node canvas into the main scene canvas at the right position
          _ctx.drawImage(this.canvas, this.x-this.w_2, this.y-this.w_2);
        };

        Node.prototype.redraw = function(){
          _ctx.beginPath();
          // white background
          _ctx.fillStyle = 'rgb(255,255,255)';
          _ctx.fillRect(this.x-this.r,this.y-this.r,this.d,this.d);

          _ctx.globalAlpha = this.faded ? 0.15 : 1;

          if(this.opened){
            // carre plein
            // _ctx.lineWidth = '1px';
            // _ctx.strokeStyle = 'rgb(255,0,0)';
            // _ctx.strokeRect(this.x - this.r-3,this.y - this.r-3,this.r*2+6,this.r*2+6);
            // ou carre contour
            // _ctx.save(); // save the normal context state (fill white)
            _ctx.fillStyle = _ecolors[this.e_color];
            _ctx.fillRect(this.x-this.r,this.y-this.r,this.d,this.d);
            // _ctx.restore(); // restore the normal context state (fill white)
          }
          // else{
          //   // carre plein
          //   // _ctx.fillStyle = _ecolors[this.e_color];
          //   // _ctx.fillRect(this.x - this.r,this.y - this.r,this.d,this.d);
          //   // ou carre contour
          //   _ctx.fillRect(this.line_width,this.line_width,this.d,this.d);
          // }
          _ctx.strokeStyle = _ecolors[this.e_color];
          _ctx.strokeRect(this.x-this.r,this.y-this.r,this.d,this.d);
          // _ctx.globalAlpha = 1;
          _ctx.closePath();
        };

        Node.initialized = true;
      }

      this.init();
    };

    // TODO: we may convert a lot of computation into a web worker
    // https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers
    function checkParticulesCollisions(){

      // do not run particule collision every frames
      if(check_parts_colid_tick < check_parts_colid_frq){
        check_parts_colid_tick++;
        return;
      }
      check_parts_colid_tick = 1;

      // pre create vars to save memory;
      var na,nb,
          ma,mb,
          w,h,dx,dy,
          makeup,
          newVelX1, newVelY1, newVelX2, newVelY2,
          Smamb;
          // , angle;
      // colisions between _particules
      for (var n = 0, l = _nodes.length; n < l; n++) {
        na = _nodes[n];
        // avoid colliding for scrambling nodes
        // avoid colliding for aside nodes
        // avoid colliding for centered nodes
        if(na.scrambling || na.aside ) continue; //|| na.center

        ma = na.p.mass;

        for (var q = n+1; q < l; q++) {
          nb = _nodes[q];
          // avoid impact between center and aside particules
          // if((na.center && nb.aside) || (na.aside && nb.center))
          // and between aside particules
          if(nb.aside)
            continue;

          // avoid impact between two centered particulses that comes to the center
          if(na.center && nb.center){
            if(Math.min(na.p.distanceTo(_attracter), nb.p.distanceTo(_attracter)) > 300){
              if( Math.random()>0.3 ) continue;
            }
          }

          w = h = (na.r+nb.r);
          // if(!na.aside && !nb.aside){
            w = h += 4; // add a saftey zone around squares eccept for aside squares
          // }

          // if both dx and dy are inferior to w & h so squares are colliding (overlapping)
          // if( Math.abs(dx) <= w && Math.abs(dy) <= h){ console.log('colliding'); }
          // else not so skip
          // if( Math.abs(dx) > w || Math.abs(dy) > h) continue;
          dx = na.p.position.x - nb.p.position.x;
          if( Math.abs(dx) > w ) continue;
          dy = na.p.position.y - nb.p.position.y;
          if(Math.abs(dy) > h) continue

          mb = nb.p.mass;
          Smamb = ma+mb;
          if(Math.abs(dx) < Math.abs(dy)){ // vertical collision
            makeup = (h - Math.abs(dy))/2;
            if(dy > 0){ // a is upper than b
              na.p.position.y += makeup;
              nb.p.position.y -= makeup;
            }else{ // b is upper than a
              na.p.position.y -= makeup;
              nb.p.position.y += makeup;
            }
            // bounce
            // https://en.wikipedia.org/wiki/Elastic_collision#One-dimensional_Newtonian
            newVelY1 = (ma-mb)/Smamb*na.p.velocity.y+2*mb/Smamb*nb.p.velocity.y;
            newVelY2 = (mb-ma)/Smamb*nb.p.velocity.y+2*ma/Smamb*na.p.velocity.y;

            na.p.velocity.y = newVelY1;
            nb.p.velocity.y = newVelY2;

          }else{ // horizontal collision
            makeup = (w - Math.abs(dx))/2;
            if(dx > 0){ // a is at left of b
              na.p.position.x += makeup;
              nb.p.position.x -= makeup;
            }else{ // b is at left of a
              na.p.position.x -= makeup;
              nb.p.position.x += makeup;
            }
            // bounce
            // https://en.wikipedia.org/wiki/Elastic_collision#One-dimensional_Newtonian
            newVelX1 = (ma-mb)/Smamb*na.p.velocity.x+2*mb/Smamb*nb.p.velocity.x;
            newVelX2 = (mb-ma)/Smamb*nb.p.velocity.x+2*ma/Smamb*na.p.velocity.x;

            na.p.velocity.x = newVelX1;
            nb.p.velocity.x = newVelX2;
          }

          // slow down particule on impact
          // na.p.velocity.multiplyScalar(na.center && na.p.velocity.length() < 1 ? 1.1 : 0.90);
          // nb.p.velocity.multiplyScalar(nb.center && nb.p.velocity.length() < 1 ? 1.1 : 0.90);
          na.p.velocity.multiplyScalar(0.90);
          nb.p.velocity.multiplyScalar(0.90);

        }
      }
    };
    // show opened audio node
    function openNodeByNid(nid){
      // console.log('Corpus openNode()', nid);
      closeNode();
      if(typeof _nodes_Nid_Id[nid] != 'undefined'){
        // console.log('node exists');
        _node_opened_id = _nodes_Nid_Id[nid];
        _nodes[_nodes_Nid_Id[nid]].open();
      }
    }
    function closeNode(){
      if(_node_opened_id != -1){
        // if(typeof _nodes[_node_opened_id] !== 'undefined'){
          _nodes[_node_opened_id].close();
        // }
        _node_opened_id = -1;
      }
    }
    function createNodesRepulsions(){
      // how to delete all these attractions before creates new once
      //console.log('_nodes_centered', _nodes_centered);
      purgeNodesRepulsions();
      for (var n = 0; n < _nodes_centered.length; n++) {
        for (var q = n+1; q < _nodes_centered.length; q++) {
          _physics.makeAttraction(_nodes_centered[n].p, _nodes_centered[q].p, -0.4, 10);
        }
      }
    };
    function purgeNodesRepulsions(){
      // console.log('_physics.attractions.length', _physics.attractions.length);
      for (var a = _physics.attractions.length-1; a >= 0; a--) {
        // assuming that only nodes repulsions have constant < 1
        // and are all at the end of array
        if(Math.abs(_physics.attractions[a].constant) < 1){
          _physics.attractions.splice(a,1);
        }else{
          break;
        }
      }
      // console.log('_physics.attractions.length', _physics.attractions.length);
    };




    //  ___         _      _   _            ____
    // | __|_ _____| |_  _| |_(_)___ _ _   |_  /___ _ _  ___
    // | _|\ V / _ \ | || |  _| / _ \ ' \   / // _ \ ' \/ -_)
    // |___|\_/\___/_|\_,_|\__|_\___/_||_| /___\___/_||_\___|
    function moveEvolutionZone(l, r){
      var left = l || 0;
      var right = r || 0;
      console.log("moveEvolutionZone",left,right);
      console.log("_scene_props", _scene_props);
      _evolution_zone.left =
        left == 0
        ? left+20
        : Math.max(_scene_props.width/5, left+20);
      _evolution_zone.right =
        right == 0
        ? _scene_props.width-right+20
        : Math.min(_scene_props.width - _scene_props.width/5, _scene_props.width-right+20);
      _evolution_zone.center = _evolution_zone.left + (_evolution_zone.right - _evolution_zone.left)/2;
      console.log("moveEvolutionZone",_evolution_zone);
      // move _attracter to the center of the zone
      resizePhysics();
    }

    //  ___              _             ___ _           _ _    _
    // | _ \__ _ _ _  __| |___ _ __   | _ \ |__ _ _  _| (_)__| |_
    // |   / _` | ' \/ _` / _ \ '  \  |  _/ / _` | || | | (_-<  _|
    // |_|_\__,_|_||_\__,_\___/_|_|_| |_| |_\__,_|\_, |_|_/__/\__|
    //                                            |__/
    function updateRandomPlaylist(p){
      _$canvas.trigger({
        type:'update-random-playlist',
        playlist:p
      })
    };

    //  ___     _
    // | __|_ _| |_ _ _ ___ ___ ___
    // | _|| ' \  _| '_/ -_) -_|_-<
    // |___|_||_\__|_| \___\___/__/
    function toggleEntree(tid, bubbling){
      var $link = _$entrees_block_termlinks.filter('[tid="'+tid+'"]');
      var $li = $link.parents('li');
      var sys_path = $link.attr('data-drupal-link-system-path');
      var url = $link.attr('href');
      var title = $link.text();
      if(!$li.is('.opened')){
        _$entrees_block_termlinks.parents('li').removeClass('opened');
        $li.addClass('opened');
        $li.parents('.item-list').addClass('opened')
        filterEntree(tid);
        if(bubbling){
          _$body.trigger({
            'type':'open_entree',
            'tid':tid,
            'url':url,
            'sys_path':sys_path,
            'title':title
          });
        }
      // bubbling is true only when event is a real click on entree link
      }else if(bubbling){
        $li.removeClass('opened');
        $li.parents('.item-list').removeClass('opened')
        scrambleCollection();
        _$body.trigger({'type':'close_entree', 'tid':tid});
      }
    };
    function filterEntree(t){
      // shutDownArticles();

      _nodes_centered = [];
      for (var n = 0; n < _nodes.length; n++) {
        if(_nodes[n].entrees.indexOf(t) == -1){
          _nodes[n].setAside();
        }else{
          _nodes[n].setCenteredOnEntree(t);
          // record centered nodes for inter node repulsions
          _nodes_centered.push(_nodes[n]);
        }
      }
      updateRandomPlaylist(_nodes_centered);
      createNodesRepulsions();
    };
    function highlightEntries(){
      _$entrees_block_termlinks
        .parents('li').removeClass('highlighted')
        .parents('.item-list').removeClass('highlighted');
      var id = -1;
      if(_node_hover_id != -1){
        id = _node_hover_id;
      }else if(_node_opened_id != -1){
        id = _node_opened_id;
      }
      var entree;
      if(id != -1){
        for (var i = 0; i < _nodes[id].entrees.length; i++) {
          entree = _nodes[id].entrees[i];
          _$entrees_block_termlinks.filter(function(){
            return $(this).attr('tid') == entree;
          }).parents('li').addClass('highlighted')
            .parents('.item-list').addClass('highlighted');
        }
      }
    };

    //  ___                  _
    // / __| ___ __ _ _ _ __| |_
    // \__ \/ -_) _` | '_/ _| ' \
    // |___/\___\__,_|_| \__|_||_|
    // and ajax modal content filtering
    function filterByNids(nids){
      // shutDownArticles();

      _nodes_centered = [];
      for (var n = 0; n < _nodes.length; n++) {
        if(nids.indexOf(_nodes[n].nid) == -1){
          _nodes[n].setAside();
        }else{
          _nodes[n].setCentered();
          // record centered nodes for inter node repulsions
          _nodes_centered.push(_nodes[n]);
        }
      }
      updateRandomPlaylist(_nodes_centered);
      createNodesRepulsions();
    };

    //  ___                    _    _ _
    // / __| __ _ _ __ _ _ __ | |__| (_)_ _  __ _
    // \__ \/ _| '_/ _` | '  \| '_ \ | | ' \/ _` |
    // |___/\__|_| \__,_|_|_|_|_.__/_|_|_||_\__, |
    //                                      |___/
    // function resolveNormalPosAllNodes(){
    //   console.log('resolveNormalPosAllNodes');
    //   for (var i = 0; i < _nodes.length; i++) {
    //     _nodes[i].resolveNormalPos();
    //   }
    // };

    function scrambleCollection(){
      console.log('Corpus scrambleCollection');
      for (var i = 0; i < _nodes.length; i++) {
        _nodes[i].scramble();
      }
      updateRandomPlaylist(_playlist);
      // setTimeout(stopScrambling, 2000);
      // stopScrambling();
    };

    function closeAllEntries(){
      _$entrees_block_termlinks.each(function(index, el) {
        if($(this).parents('li').is('.opened')){
          $(this).trigger('click');
          return false;
        }
      });
    };

    //    _       _   _    _
    //   /_\  _ _| |_(_)__| |___ ___
    //  / _ \| '_|  _| / _| / -_|_-<
    // /_/ \_\_|  \__|_\__|_\___/__/
    function initArtilesLink(){
     // add "articles link to blockentrees"
     var href = window.location.origin + drupalSettings.path.baseUrl +_settings.articlesindex_url;
     _$articles_link = $('<a>')
       .html('Articles')
       .attr("href", href)
       .attr("data-drupal-link-system-path", _settings.articlesindex_url)
       .addClass('articles-link ajax-link');
       // main.js from template will load the index then trigger the filter here
       // .on('click', onCLickedOnArticles);

       $('.item-list ul',_$entrees_block).append(
         $('<li>').append(
           $('<span class="oblique-wrapper">').append(_$articles_link)
         )
       );
    };
    // function onCLickedOnArticles(e){
    //   e.preventDefault();
    //   $(this).toggleClass('is-active');
    //   if($(this).is('.is-active')){
    //     activateArticlesFilter();
    //     closeAllEntries();
    //   }else{
    //     deactivateArticlesFilter();
    //   }
    //   // _$canvas.trigger({
    //   //   'type':'corpus-cliqued-on-articles'
    //   // });
    //   return false;
    // };
    // function activateArticlesFilter(){
    //   //console.log('activateArticlesFilter');
    //   _articles_filter_on = true;
    //   // OPTION 1 : just fade no article nodes
    //   // for (var i = 0; i < _no_articles_nodes.length; i++) {
    //   //   _no_articles_nodes[i].fade();
    //   // }
    //   // END OPTION 1
    //
    //   // OPTION 2 : center the articles nodes and aside others
    //   closeAllEntries();
    //   _nodes_centered = [];
    //   for (var i = 0; i < _articles_nodes.length; i++) {
    //     _articles_nodes[i].setCentered();
    //     // record centered nodes for inter node repulsions
    //     _nodes_centered.push(_articles_nodes[i]);
    //   }
    //   for (var i = 0; i < _no_articles_nodes.length; i++) {
    //     _no_articles_nodes[i].setAside();
    //   }
    //   // TODO: open an index of nodes with articles
    //   // loadArticlesIndex();
    //   // END OPTION 2
    //
    //   updateRandomPlaylist(_articles_nodes);
    //   if(typeof _paq !== 'undefined'){
    //     // trackEvent(category, action, [name], [value])
    //     _paq.push(['trackEvent', 'Corpus Articles', 'on']);
    //   }
    // };
    // function loadArticlesIndex(){
    //   var path = window.location.origin + drupalSettings.path.baseUrl +_settings.articlesindex_url+'/ajax';
    //   $.getJSON(path)
    //     .done(function(data){
    //       onArticlesIndexLoaded(data);
    //     })
    //     .fail(function(jqxhr, textStatus, error){
    //       onArticlesIndexLoadFail(jqxhr, textStatus, error);
    //     });
    // };
    //
    // function onArticlesIndexLoaded(data){
    //   // insert index col
    //   _$container.find('main[role="main"] .row').append(data.rendered);
    //
    //   // trigger event
    //   _$body.trigger({
    //     'type':'articles-index-loaded',
    //     'results':data.results_nids
    //   });
    // };
    //
    // function onArticlesIndexLoadFail(jqxhr, textStatus, error){
    //   console.warn('EdlpCorpus : articles index ajax load failed : '+error, jqxhr.responseText);
    // };
    // function deactivateArticlesFilter(){
    //   //console.log('deactivateArticlesFilter');
    //   _articles_filter_on = false;
    //
    //   // OPTION 1 : just fade no article nodes
    //   // for (var i = 0; i < _no_articles_nodes.length; i++) {
    //   //   _no_articles_nodes[i].unFade();
    //   // }
    //
    //   // OPTION 2 : centered / aside
    //   scrambleCollection();
    //
    //   updateRandomPlaylist(_playlist);
    //   if(typeof _paq !== 'undefined'){
    //     // trackEvent(category, action, [name], [value])
    //     _paq.push(['trackEvent', 'Corpus Articles', 'off']);
    //   }
    // };
    // function shutDownArticles(){
      // shutdown articles if active
    //   if(_$articles_link.is('.is-active'))
    //     _$articles_link.trigger('click');
    // };

    //  ___             _
    // | __|_ _____ _ _| |_ ___
    // | _|\ V / -_) ' \  _(_-<
    // |___|\_/\___|_||_\__/__/
    function initEvents(){
      console.log('Corpus, initEvents');
      _$canvas
        .on('mousemove', function(event) {
          event.preventDefault();
          _m_pos.x = event.originalEvent.clientX;
          _m_pos.y = event.originalEvent.clientY;
        })
        .on('mouseenter', function(event){
          // console.log('onMouseIN');
          _mouse_in = true;
        })
        .on('mouseout', function(event){
          // console.log('onMouseOUT');
          _mouse_in = false;
          _node_pop_up.removeNode();
        })
        .on('click', function(event) {
          if(event.target.tagName != "A" && event.target.tagName != "INPUT"){
            // console.log("Corpus : click");
            event.preventDefault();
            if(_node_hover_id != -1){
              // console.log("corpus : click on node", _nodes[_node_hover_id]);
              var event = {
                'type':'corpus-cliked-on-node',
                'target_node':_nodes[_node_hover_id],
                // 'article':_articles_filter_on
              };
              _$canvas.trigger(event);
              // instead of directly opening the doc, create an event listener (e.g. : audio played from random)
              // openNode(_node_hover_id);
            }else{
              // console.log('corpus : click on map');
              _$canvas.trigger('corpus-cliked-on-map');
              // shutDownArticles();
            }
          }
        })
        .on('mouseover-audio-link', function(e){
          console.log("Corpus on mouseover-audio-link", e);
          // _node_hover_id = _nodes_Nid_Id[e.nid];
          // _node_pop_up.setNode(_nodes_by_nid[e.nid]);
          _nodes_by_nid[e.nid].setHover();
        })
        .on('mouseout-audio-link', function(e){
          console.log("Corpus on mouseover-audio-link", e);
          // _node_hover_id = -1;
          // _node_pop_up.removeNode();
          _nodes_by_nid[e.nid].unsetHover();
        })
        .on('audio-node-opened', function(e){
          // console.log('Corpus audio-node-opened', e);
          openNodeByNid(e.nid);
        })
        .on('audio-node-closed', function(e){
          closeNode();
        })
        .on('open-entree', function(e){
          toggleEntree(e.tid);
        })
        .on('close-all-entree', function(e){
          closeAllEntries();
        })
        .on('scramble-collection', function(e){
          console.log('scramble-collection', e);
          // resolveNormalPosAllNodes();
          scrambleCollection();
        })
        .on('shuffle-collection', function(e){
          console.log('shuffle-collection', e);
          onResizeCanvas();
        });

      _$entrees_block_termlinks.on('click', function(event) {
        // console.log('_$entrees_block_termlinks click', this);
        event.preventDefault();
        toggleEntree($(this).attr('tid'), true);
        // var $link = $(this);
        // var tid = $link.attr('tid');
        // var $li = $link.parents('li');
        // var sys_path = $link.attr('data-drupal-link-system-path');
        // var url = $link.attr('href');
        // if(!$li.is('.opened')){
        //   _$entrees_block_termlinks.parents('li').removeClass('opened');
        //   $li.addClass('opened');
        //   toggleEntree(tid);
        //   _$body.trigger({'type':'open_entree', 'tid':tid, 'url':url, 'sys_path':sys_path});
        // }else{
        //   $li.removeClass('opened');
        //   scrambleCollection();
        //   _$body.trigger({'type':'close_entree', 'tid':tid});
        // }
        return false;
      });

      _$body
        .on('chutier-action-done', function(e) {
          _nodes_by_nid[e.target_id].chutier_action = e.new_action;
        })
        .on('ajax-node-loaded-linked-documents', function(e){
          console.log("Edlp Corpus, ajax-node-loaded-linked-documents",e.nids);
          // filter map's nodes
          filterByNids(e.nids);
        })
        .on('search-results-loaded', function(e){
          //console.log("Edlp Corpus, search-results-loaded",e.results);
          // filter map's nodes
          filterByNids(e.results);
        })
        .on('search-closed', function(e){
          scrambleCollection();
        })
        .on('new-content-not-entree-ajax-loaded', function(e){
          // close all entries only if entry already opened
          // TODO: user the function close all entries ?
          // closeAllEntries(); not working, is closing also the ajax loaded content
          if(_$entrees_block_termlinks.parents('li.opened').length){
            _$entrees_block_termlinks
              .parents('li').removeClass('opened')
              .parents('.item-list').removeClass('opened');
            scrambleCollection();
          }
        })
        .on('visible-space-changed', function(e){
          // limits are absolute distance from each side (not positions from left)
          moveEvolutionZone(e.left_limit, e.right_limit);
        });
    };

    function checkPreOpenedEntry(){
      _$entrees_block.find('li.entree').each(function(index, el) {
        var $li = $(this);
        if($('a.is-active', $li).length){
          $li.addClass('opened')
            .parents('.item-list').addClass('opened');
          filterEntree($li.attr('tid'));
          return false;
        }
      });
    };

    //  _  _         _     ___          _   _
    // | \| |___  __| |___| _ \___ _ __| | | |_ __
    // | .` / _ \/ _` / -_)  _/ _ \ '_ \ |_| | '_ \
    // |_|\_\___/\__,_\___|_| \___/ .__/\___/| .__/
    //                            |_|        |_|
    function initNodePopup(){
      _node_pop_up = new NodePopUp();
    };
    function NodePopUp(){
      this.visible = false;
      this.node;
      this.$dom = $('<div>')
        .addClass('node-popup')
        .attr('pos', 'top-right')
        .appendTo('body');
      this.$content = $('<div>').addClass('inner').appendTo(this.$dom);

      if (typeof NodePopUp.initialized == "undefined") {

        NodePopUp.prototype.setNode = function(n){
          // console.log('NodePopUp setNode()');
          this.node = n;
          // positioning NodePopUp regarding node position
          this.setPositioning();
          // update NodePopUp content
          this.setContent();
        };

        NodePopUp.prototype.setPositioning = function(){
          // switch(true){
          //   case this.node.x > this.node.wall_limits.right-350-_evolution_zone.right && this.node.y < this.node.wall_limits.top+200:
          //     this.$dom.attr('pos', 'bottom-left');
          //     break;
          //   case this.node.x > this.node.wall_limits.right-350-_evolution_zone.right:
          //     this.$dom.attr('pos', 'top-left');
          //     break;
          //   case this.node.y < this.node.wall_limits.top+200:
          //     this.$dom.attr('pos', 'bottom-right');
          //     break;
          //   default:
          //     this.$dom.attr('pos', 'top-right');
          // }
          switch(true){
            case this.node.x > _evolution_zone.right-350 && this.node.y < this.node.wall_limits.top+200:
              this.$dom.attr('pos', 'bottom-left');
              break;
            case this.node.x > _evolution_zone.right-350:
              this.$dom.attr('pos', 'top-left');
              break;
            case this.node.y < this.node.wall_limits.top+200:
              this.$dom.attr('pos', 'bottom-right');
              break;
            default:
              this.$dom.attr('pos', 'top-right');
          }
        };

        NodePopUp.prototype.setContent = function(){
          // console.log(this.node);
          this.$content.html('');
          var $entrees = $('<div>').addClass('entrees');
          for (var i = 0; i < this.node.entrees.length; i++) {
            var tid = this.node.entrees[i];
            $entrees.append($('<span>').addClass('entree').attr('tid', tid));
          }
          var $chutier_action = $('<span>').addClass('chutier-icon').attr('action', this.node.chutier_action);
          this.$content
            .append($entrees)
            .append('<h2 class="title">'+this.node.title+'</h2>')
            .append('<section class="description">'+this.node.description+'</section>')
            .append($chutier_action);
        };

        NodePopUp.prototype.removeNode = function(){
          // console.log('NodePopUp removeNode()');
          this.node = false;
        };

        NodePopUp.prototype.draw = function(){
          if(this.node){
            this.$dom.css({
              'display':"block",
              'left':this.node.x+"px",
              'top':this.node.y+"px",
            });
          }else{
            this.$dom.css({
              'display':"none",
            });
          }
        };

        NodePopUp.initialized = true;
      }
    }

    //  ___             _
    // | _ \___ _ _  __| |___ _ _
    // |   / -_) ' \/ _` / -_) '_|
    // |_|_\___|_||_\__,_\___|_|
    function render(){
      _ctx.clearRect(0, 0, _scene_props.width, _scene_props.height);

      checkParticulesCollisions();

      for (var i = 0; i < _nodes.length; i++) {
        _nodes[i].onUpdate();
      }

      _node_pop_up.draw();

      if(_node_hover_id != -1){
        _canvas.style.cursor = 'pointer';
      }else{
        _canvas.style.cursor = 'auto';
      }
      // check for highlighted entries
      highlightEntries();
    };

    //  ___ _            _     _        _
    // / __| |_ __ _ _ _| |_  /_\  _ _ (_)_ __  ___
    // \__ \  _/ _` | '_|  _|/ _ \| ' \| | '  \/ -_)
    // |___/\__\__,_|_|  \__/_/ \_\_||_|_|_|_|_\___|
    function startAnime(){
      _physics.onUpdate(render);
      _physics.play()
      $('body')
        .attr('corpus', 'map-ready')
        .trigger({
          'type':'corpus-map-ready',
          'playlist':_playlist
        });
    };

    init();
  }


  $(document).ready(function($) {
    console.log("Corpus ready");
    if(drupalSettings.path.isFront && !edlp_mobile.device_is_mobile){
      console.log("Corpus new edlpCorpus()");
      var edlpcorpus = new EdlpCorpus();
    }
  });

})(jQuery, Drupal, drupalSettings);