'use strict';

/**
 * Module dependencies.
 */
var mongoose = require('mongoose'),
	errorHandler = require('./errors.server.controller'),
	Form = mongoose.model('Form'),
	FormSubmission = mongoose.model('FormSubmission'),
	config = require('../../config/config'),
	diff = require('deep-diff'),
	_ = require('lodash');

/**
 * Delete a forms submissions
 */
exports.deleteSubmissions = function(req, res) {

	var submission_id_list = req.body.deleted_submissions,
		form = req.form;

	FormSubmission.remove({ form: req.form, _id: {$in: submission_id_list} }, function(err){

		if(err){
			res.status(400).send({
				message: errorHandler.getErrorMessage(err)
			});
			return;
		}

		form.analytics.visitors = [];
		form.save(function(formSaveErr){
			if(formSaveErr){
				res.status(400).send({
					message: errorHandler.getErrorMessage(formSaveErr)
				});
				return;
			}
			res.status(200).send('Form submissions successfully deleted');

		});
	});
};

/**
 * Submit a form entry
 */
exports.createSubmission = function(req, res) {

	var timeElapsed = 0;

	if(typeof req.body.timeElapsed === 'number'){
		timeElapsed = req.body.timeElapsed;
	}
	var submission = new FormSubmission({
		form: req.body._id,
		form_fields: req.body.form_fields,
		timeElapsed: timeElapsed,
		percentageComplete: req.body.percentageComplete,
		ipAddr: req.body.ipAddr,
		geoLocation: req.body.geoLocation,
		device: req.body.device
	});

	submission.save(function(err, submission){
		if (err) {
			console.error(err.message);
			return res.status(500).send({
				message: errorHandler.getErrorMessage(err)
			});
		}
		res.status(200).send('Form submission successfully saved');
	});
};

/**
 * Get List of Submissions for a given Form
 */
exports.listSubmissions = function(req, res) {
	var _form = req.form;

	FormSubmission.find({ form: _form._id }).sort('created').lean().exec(function(err, _submissions) {
		if (err) {
			console.error(err);
			res.status(500).send({
				message: errorHandler.getErrorMessage(err)
			});
		}
		res.json(_submissions);
	});
};

/**
 * Create a new form
 */
exports.create = function(req, res) {
	
	if(!req.body.form){
		return res.status(400).send({
			message: 'Invalid Input'
		});
	}
	var form = new Form(req.body.form);

	form.admin = req.user._id;

	form.save(function(err) {
		debugger;
		if (err) {
			return res.status(500).send({
				message: errorHandler.getErrorMessage(err)
			});
		}

		return res.json(form);
	});
};

/**
 * Show the current form
 */
exports.read = function(req, res) {
	if(!req.user || (req.form.admin.id !== req.user.id) ){
		readForRender(req, res);
	} else {
			var newForm = req.form.toJSON();

			if (req.userId) {
				if(req.form.admin._id+'' === req.userId+''){
					return res.json(newForm);
				}
				return res.status(404).send({
					message: 'Form Does Not Exist'
				});
			}
			return res.json(newForm);
	}
};

/**
 * Show the current form for rendering form live
 */
var readForRender = exports.readForRender = function(req, res) {
	var newForm = req.form;
	if (!newForm.isLive && !req.user) {
		return res.status(401).send({
			message: 'Form is Not Public'
		});
	}

	delete newForm.lastModified;
	delete newForm.__v;
	delete newForm.created;

	if(newForm.startPage && !newForm.startPage.showStart){
		delete newForm.startPage;
	}

	return res.json(newForm);
};

/**
 * Update a form
 */
exports.update = function(req, res) {

    var form = req.form;
    var updatedForm = req.body.form;
    if(form.form_fields === undefined){
    	form.form_fields = [];
    }

    if(form.analytics === undefined){
    	form.analytics = {
    		visitors: [],
    		gaCode: ''
    	}
    }

	if (req.body.changes) {
		var formChanges = req.body.changes;

		formChanges.forEach(function (change) {
			diff.applyChange(form._doc, true, change);
		});
	} else {

	    delete updatedForm.__v;
	    delete updatedForm.created; 
		//Unless we have 'admin' privileges, updating the form's admin is disabled
		if(updatedForm && req.user.roles.indexOf('admin') === -1) {
			delete updatedForm.admin;
		}

		if(form.analytics === null){
			form.analytics.visitors = [];
			form.analytics.gaCode = '';
		}

		//Do this so we can create duplicate fields
		var checkForValidId = new RegExp('^[0-9a-fA-F]{24}$');
		for(var i=0; i < req.body.form.form_fields.length; i++){
			var field = req.body.form.form_fields[i];
			if(!checkForValidId.exec(field._id+'')){
				delete field._id;
			}
		}
		form = _.extend(form, updatedForm);
	}

	form.save(function(err, savedForm) {
		if (err) {
            res.status(500).send({
				message: errorHandler.getErrorMessage(err)
			});
		} else {
			res.json(savedForm);
		}
	});
};

/**
 * Delete a form
 */
exports.delete = function(req, res) {
	var form = req.form;
	Form.remove({_id: form._id}, function(err) {
		if (err) {
			res.status(400).send({
				message: errorHandler.getErrorMessage(err)
			});
		} else {
			res.json(form);
		}
	});
};

/**
 * Get All of Users' Forms
 */
exports.list = function(req, res) {
	//Allow 'admin' user to view all forms
	var searchObj = {admin: req.user};
	if(req.user.isAdmin()) searchObj = {};

	Form.find(searchObj)
		.sort('-created')
		.select('title language admin submissions isLive')
		.populate('admin.username', 'admin._id')
		.lean()
		.exec(function(err, forms) {
		if (err) {
			res.status(400).send({
				message: errorHandler.getErrorMessage(err)
			});
		} else {
			for(var i=0; i<forms.length; i++){
				forms[i].numberOfResponses = 0;
				if(forms[i].submissions){
					forms[i].numberOfResponses = forms[i].submissions.length;
					delete forms[i].submissions;
				}
			}
			res.json(forms);
		}
	});
};

/**
 * Form middleware
 */
exports.formByID = function(req, res, next, id) {
	if (!mongoose.Types.ObjectId.isValid(id)) {
		return res.status(400).send({
			message: 'Form is invalid'
		});
	}
	Form.findById(id)
		.populate('admin')
		.exec(function(err, form) {
		if (err) {
			return next(err);
		} else if (!form || form === null) {
			res.status(404).send({
				message: 'Form not found'
			});
		}
		else {
			//Remove sensitive information from User object
			 var _form = form;
                        _form.admin.password = null;
                        _form.admin.salt = null;
                        _form.provider = null;

                        req.form = _form;
			return next();
		}
	});
};

/**
 * FastForm middleware
 */
exports.formByIDFast = function(req, res, next, id) {
	if (!mongoose.Types.ObjectId.isValid(id)) {
		return res.status(400).send({
			message: 'Form is invalid'
		});
	}
	Form.findById(id)
		.lean()
		.select('title language form_fields startPage endPage hideFooter isLive design analytics.gaCode')
		.exec(function(err, form) {
		if (err) {
			return next(err);
		} else if (!form || form === null) {
			res.status(404).send({
				message: 'Form not found'
			});
		}
		else {
			//Remove sensitive information from User object
			var _form = form;
			if(_form.admin){
			_form.admin.password = null;
			_form.admin.salt = null;
			_form.provider = null;
			}
			req.form = _form;
			return next();
		}
	});
};

/**
 * Form authorization middleware
 */
exports.hasAuthorization = function(req, res, next) {
	var form = req.form;
	if (req.form.admin.id !== req.user.id && req.user.roles.indexOf('admin') === -1) {
		res.status(403).send({
			message: 'User '+req.user.username+' is not authorized to edit Form: '+form.title
		});
	}
	return next();
};