Resource.coffee

_ = require 'lodash'
q = require 'q'

# abstract
class Resource
	account: null
	resourceFactory: null
	constructor: ->
	getPropertySet: ->
		return _.keys @propertyMap
	setAccessContext: (@account) ->
		return @
	setResourceFactory: (@resourceFactory) ->
		return @
	getResourceFactory: ->
		if @resourceFactory == null
			@resourceFactory = new (require './ResourceFactory')
			@resourceFactory.addResource @
		return @resourceFactory
	can: (verb, id = null) ->
		# no real clue yet on what I'm doing with this
		# 
		# navigation =
		# 	path: ''
		# 	idList: []
		# 
		# for rule in @access[verb]
		# 	partList = rule.path.split '/'
		# 	for part, i in partList
		# 		if part == '{A}'
		# 			navigation.idList.push @account
		# 		else if path == '{true}'
		# 			navigation.idList.push true
		# 		else
		# 			if i == 0
		# 				navigation.path = part
		# 			else
		# 				navigation.path = navigation.path + '/' + part
	getPropertyDefinition: (property) ->
		if typeof @propertyMap[property] == 'undefined'
			return null
		definition = @propertyMap[property]
		if typeof definition == 'string'
			definition = type: definition
		return definition
	navigate: (path, resourceObj) ->
		if _.isString path
			path = path.split '/'
			for x, i in path
				path[i] = path[i].trim()
		path = _.without path, ''
		if path.length == 0
			return @get resourceObj
		property = path[0]
		definition = @getPropertyDefinition property
		if definition == null
			throw "INVALID PATH - UNKNOWN : #{ property } is an unknown property for #{ @name }"
		if definition.type == 'reference'
			resource = @
			return @get(resourceObj, property).then (reference) ->
				referencedResource = resource.getResourceFactory().getResource definition.resource
				if _.isArray reference
					reference = _.unique reference
					reference = _.without reference, null
				return referencedResource.navigate path[1..], reference
		if path.length > 1
			throw "INVALID PATH - UNREACHABLE : #{ path[1] } is unreachable because it is specified after a value property"
		if definition.type == 'valueList' && _.isArray resourceObj
			return @get(resourceObj, property).then (list) ->
				return _.uniq _.flatten list, true
		# 'value'
		return @get resourceObj, property
	get: (id, propertyList = null) ->
		# should be implemented by extending class
	post: (data = null, propertyList = null) ->
		# should be implemented by extending class
	put: (id, data = null, propertyList = null) ->
		# should be implemented by extending class
	delete: (id) ->
		# should be implemented by extending class
module.exports = Resource