var mongoose = require('mongoose'); 
var _ = require("underscore"); 

var NodeSchema = new mongoose.Schema({
    text: {type: String}, 
    children: {type: Array}, 
    parents: {type: Array}, 
    markdown: {type: Boolean},
    timestamp: {type: Number}, 
    authorId: {type: String, ref: 'User'}, //authorId is populated with limited AuthorObject
    _id: String
}); //mongoose.Schema.Types.ObjectId

var MyNode = mongoose.model('nodes', NodeSchema);

var snapModule = require('./Snap.js');
var MySnap = snapModule.MySnap; 
var addSnap = snapModule.addSnap; 



// Exports
module.exports.MyNode = MyNode; 

module.exports.findAndSocketSend = findAndSocketSend
module.exports.setUpDB = setUpDB;

module.exports.moveNode = moveNode;
module.exports.removeNode = removeNode;
module.exports.updateParent = updateParent;
module.exports.updateText = updateText;
module.exports.addNode = addNode;




// module.exports.rootNodeId = rootNodeId;

// var rootID;
// function rootNodeId(){
//   return rootID;
// }

//http://mongoosejs.com/docs/populate.html
function findAndSocketSend(socket, CURRENT_TIMESTAMP){
  var nodes = {'keeping': 'calm'}
  // .populate('authorId').populate('google.name')
  MyNode.find().exec(function(err, nodes){
    console.log("NODES"); 
    console.log(nodes); 
    if(!err){
      // require("underscore").each(nodes, function(node){console.log(node)}); 
      socket.emit('nodeData', nodes, CURRENT_TIMESTAMP)
      return {'hell': 'yes'}
    }else{
      socket.emit('nodeData', "error!!!")
     return {'hell': 'no'}
    }

    
  }); 
}


function setUpDB(){
  MyNode.remove({}, function(err) { console.log('collection removed') });
  MySnap.remove({}, function(err) { console.log('collection removed') });
  var curtisId = "54412cf9d7018300009d42c7"; 
  
  //"42" is there, so that it doesn't get deleted during snapCommits (for not having a parent). 
  addNode("0root", [], ["42"], curtisId , "a42a" , function(err, rootNode){ 
    console.log("rootNode", rootNode); 
    addNode("Welcolme!", [], [rootNode._id], curtisId , "b42b", function(err, firstBullet){
      rootNode.children = [firstBullet._id]
      var now = rootNode.timestamp = firstBullet.timestamp
      addSnap(rootNode, now); 
      addSnap(firstBullet, now);
    }); 
  }); 
}

function updateText(id, newText, authorId){
  MyNode.findById(id, null, function(err, node){
    if(err || node == null){
      return;
    }
    if(node.text==newText){return;}
    node.timestamp = Date.now();
    node.text = newText;
    node.authorId = authorId; 
    node.save();
  });
}












function moveNode(ids, arrays, authorId){
  var now = Date.now();
  var numCallbacks = 0; 

  var thisId = ids[0]; //draggedId
  MyNode.findById(thisId, null, function(err, node){
    node.author = authorId; //
    node.timestamp = now; 
    node.parents = arrays[0];
    node.save(parallelExecutionHelper);
  });

  var oldParId = ids[1];
  MyNode.findById(oldParId, null, function(err, node){
    node.timestamp = now; 
    node.children = arrays[1];
    helperLib.validateParArr(oldParId, node.children); 
    node.save(parallelExecutionHelper);
  });

  var newParId = ids[2];
  MyNode.findById(newParId, null, function(err, node){
    node.timestamp = now; 
    node.children = arrays[2];
    helperLib.validateParArr(newParId, node.children); 
    node.save(parallelExecutionHelper);
  });


  function parallelExecutionHelper(){
    numCallbacks++; 
    if(numCallbacks==3){
      console.log("FINISHED- MoveNode,ParallelExecutionHelper")
      helperLib.iterateQueue(); 
      numCallbacks=0; 
    }
  }
}

function removeNode(thisId, thisIndex, parId, authorId){
  var now = Date.now();
  console.log("removing Node"); 

  MyNode.findById(parId, null, function(err, parNode){
    if(err || parNode == null){
      return;
    }
    // var temp = parNode.children;
    // temp.splice(thisIndex, 1); //remove thisIndex. 
    // parNode.children = temp;
    parNode.children.splice(thisIndex,1); 
    parNode.timestamp = now; 

    helperLib.validateParArr(parId, parNode.children); 
    parNode.save(function(){helperLib.iterateQueue()});
  });

  MyNode.findById(thisId, null, function(err, delNode){
    if(err || delNode == null){
      return;
    }
    delNode.author = authorId; 
    delNode.timestamp = now; 
    if(delNode.parents.length ==1 ){//(this if statement is technically redundant)
      // delNode.remove();
      delNode.parents = []; //(this is how deletion is represented). 
      delNode.save(); 
    }
    else{ //this is the condition that we'll have to take care of if there are dups. 
      delNode.parents = _.without(delNode.parents, parId);
      delNode.save();
    }
    
  }); 


}






function updateParent(parId, newId ,newIndex,now){
  MyNode.findById(parId, null, function(err, parNode){
    if(err || parNode == null){
      return;
    }
    parNode.children.insert(newIndex, newId);
    parNode.timestamp = now; 

    helperLib.validateParArr(parId, parNode.children); 
    parNode.save();
  })
}

//add Node to the DB. 
function addNode(text, children, parents, authorId, ID ,callback){
  var instance = new MyNode();
  instance.text = text; 
  instance.children = children;
  instance.parents = parents;
  instance.markdown = 0; 
  instance.timestamp = Date.now(); 
  instance.authorId = authorId; 
  instance._id = ID; 

  instance.save(function (err) { 
    if (err) {
      callback(err);
    }
  else {
      helperLib.iterateQueue(); 
      callback(null, instance, instance.timestamp); 
    }
  }); 
}












Array.prototype.insert = function (index, item) {
  this.splice(index, 0, item);
};

Array.prototype.remove = function(from, to) {
  var rest = this.slice((to || from) + 1 || this.length);
  this.length = from < 0 ? this.length + from : from;
  return this.push.apply(this, rest);
};


var helperLib = require("../lib/helperLib.js"); 
console.log("HELPERLIB"); 
console.log(helperLib);