(function() {
	'use strict';

	/*
	 * Catalogs module
	 */

	angular.module('catalogs', ['ngResource'])

	.service('Catalogs', ['$rootScope', '$http', '$resource', '$q', function ($rootScope, $http, $resource, $q) {
		var resources = {
				application : $resource('/application/:appId', {
					appId : '@id'
				}),
				user : $resource('/user/:userId', {
					userId : '@username'
				}),
				organization : $resource('/organization/:orgId', {
					orgId : '@id'
				}),
				licensetype : $resource('/licensetype/:licenseTypeId', {
					licenseTypeId : '@id'
				})
		}

	var _metadata = null;
	var _current = null;

	var _list = function() {
		return $http.get('/js/catalogs.json').success(function(data) {
			_metadata = data;
		})
	}
	this.init = function() {
		return _list();
	}
	this.getList = function() {
		return _metadata;
	}
	this.getName = function(index) {
		if (index === undefined)
			return _current ? _current.name : '';
		return _metadata ? _metadata[index].name : '';
	}
	this.getResource = function(res) {
		if (res === undefined)
			return _current ? resources[_current.resource] : null;
		return _current ? resources[res] : null;		
	}
	this.getPk = function(catalogMetadata) {
		if (!catalogMetadata) catalogMetadata = _current;
		
		for(var i = 0; i < catalogMetadata.fields.length; i++)
			if (catalogMetadata.fields[i].pk) return catalogMetadata.fields[i].name; 
			
		return null;		
	}
	/**
	 * Returns catalog metadata
	 * @param index: Return current catalog if undefined, if string It find the catalog by resoource name if number it find it by position
	 */
	this.getMetadata = function(index) {
		if (!_metadata) throw new Error('There is no catalog metadata info');
		if (index === undefined)
			return _current;
		if (typeof index === 'string') {
			for (var i = _metadata.length - 1; i >= 0 && _metadata[i].resource !== index; i--);
			index = i;
		} 

		return _metadata[index];
	}
	this.setCurrent = function(index) {
		if (!_metadata) throw new Error('There is no catalog metadata info');
		if (index === undefined)
			_current = null;
		else
			_current = _metadata[index];
	}
	/********************************************
	 * Catalog fields methods                   *
	 ********************************************/

	/**
	 * Returns the first field in form that should get the focus. We find the first field that is not read only 
	 */
	this.getFFF = this.getFirstFocusableField = function() {
		if (!_current) throw new Error('There is no current catalog selected');
		
		for(var i = 0; i < _current.fields.length; i++)
			if (!_current.fields[i].readOnly) return _current.fields[i].name;
		
		return null;
	}

	/**
	 * Find the field by name or position 
	 */
	this.getField = function(key) {
		if (!_current) throw new Error('There is no current catalog selected');
		var index = -1;
		if (typeof key === 'string') {
			for (var i = _current.fields.length - 1; i >= 0 && _current.fields[i].name !== key; i--);
			index = i;
		} else {
			index = key; // In this case key === field position
		}

		return index === -1 ? {} : _current.fields[index];
	}
	
	/********************************************
	 * Catalog resource operations on server    *
	 ********************************************/

	function _success(response) {
		console.log('$resource')
		console.log(response)
	}
	function _fail(response) {
		console.error('Error trying to get data, HTTP error code: ' + response.status)
	}
	
	
	this.save = function(data) {
		if (!_current) throw new Error('There is no current catalog selected');

		var resource = this.getResource();
		return resource.save(data, _success, _fail);
	}
	this.remove = function(data) {
		return this.getResource().remove({}, data, _success, _fail)
	}
	this.query = function() {
		return this.getResource().query({}, _success, _fail);
	}
	this.refreshRef = function(refs, res, preloadedData) {
		// We check if there is some field for the resource passed as parameter
		var field = (function() {
			for (var i = _current.fields.length - 1; i >= 0; i--) {
				if (_current.fields[i].resource === res)
					return _current.fields[i];				
			}
			return null;
		})();
		
		// If field for that resource is not found there is nothing to refresh
		if (!field) return;
		var resource = this.getResource(res);
		var data = preloadedData || resource.query({}, _success, _fail);
		var that = this;
		data.$promise.then(function(responseData) {
			var pk = that.getPk(that.getMetadata(field.resource))
			var comboData = []
			responseData.forEach(function(row) {
				comboData.push({
					id: row[pk],
					label: row.label || row.name || row.code || row.first_name + ' ' + row.last_name
				});
			})
			refs[field.name] = comboData;
		})
	}
	this.loadRefs = function(refs) {
		if (!_current) throw new Error('There is no current catalog selected');
		var refsFields = [];
		_current.fields.forEach(function(f) {
			if (f.resource)
				refsFields.push(f)

		});
		
		var that = this;
		var promises = []
		refsFields.forEach(function(f) {
			var resource = that.getResource(f.resource);
			refs[f.name] = resource.query({}, _success, _fail);
			promises.push(refs[f.name].$promise);
		});
		
		console.log('promises: ' + promises.length + ' ')
		console.log(promises)
		$q.all(promises).then(function() {
			
			for (var k in refs) {
				var field = that.getField(k);
				var pk = that.getPk(that.getMetadata(field.resource))
				console.log('PK field for ' + k + ' is ' + pk)
				var comboData = []
				refs[k].forEach(function(row) {
					console.log('field.resource !== _current.resource: ' + field.resource +' '+ _current.resource)
					comboData.push({
						id: row[pk],
						label: row.label || row.name || row.code || row.first_name + ' ' + (row.last_name || '')
					});
				})
				refs[k] = comboData;
				console.log('Ready for combo for ' + k)
				console.log(comboData);
			}
			_current.fields.forEach(function(f) {
				if (f.values)
					refs[f.name] = f.values;
			});
		})
		
		console.log(refs);
		return refs;
	} 
	
	}])

})();