dbo.coffee

# dboperator
class DBOperator extends Factory.ExtClass
	constructor: (@_collection) ->
		@_selector = {}
		@_options = {}
		@_modifier = {}

	where: (args...) ->
		for arg in args
			unless _is.object arg
				@_selector._id = arg
			else
				_.extend @_selector, arg
		return @

	modify: (mod, arg) ->
		@_modifier[mod] = @_modifier[mod] or {}
		if _is.object arg
			_.extend @_modifier[mod], arg
		return @
	set: (arg) -> @modify '$set', arg
	unset: (arg) -> @modify '$unset', arg
	add: (arg) -> @modify '$addToSet', arg
	push: (arg) -> @modify '$push', arg
	pull: (arg) -> @modify '$pull', arg
	inc: (arg) -> @modify '$inc', arg

	skip: (num) ->
		@_options.skip = num
		return @
	limit: (num) ->
		@_options.limit = num
		return @
	range: (skip, limit) ->
		@skip(skip).limit(limit)

	fields: (args...) ->
		@_options.fields = @_options.fields or {}
		for arg in args
			if _is.object arg
				_.extend @_options.fields, arg
		return @
	only: (args...) ->
		@_options.fields = @_options.fields or {}
		for arg in args
			if _is.string arg
				@_options.fields[arg] = 1
		return @
	without: (args...) ->
		@_options.fields = @_options.fields or {}
		for arg in args
			if _is.string arg
				@_options.fields[arg] = -1
		return @
	sort: (args...) ->
		@_options.sort = @_options.sort or []
		for arg in args
			if _is.object arg
				for key, value of arg
					value = if (value is 0) or (value is -1) or (value is 'desc') then 'desc' else 'asc'
					@_options.sort.push [key, value]
		return @
	sortUp: (args...) ->
		@_options.sort = @_options.sort or []
		for arg in args
			if _is.string arg
				@_options.sort.push [arg, 'asc']
		return @
	sortDown: (args...) ->
		@_options.sort = @_options.sort or []
		for arg in args
			if _is.string arg
				@_options.sort.push [arg, 'desc']
		return @
	multy: (arg = true) ->
		@_options.multy = arg
		return @
	find: () ->
		@_collections.find @_selector, @_options
	findOne: () ->
		@_collections.findOne @_selector, @_options
	undate: (callback) ->
		@_collection.update @_selector, @_modifier, callback
	upsert: (callback) ->
		@_collection.upsert @_selector, @_modifier,callback
	remove: (callback) ->
		@_collection.remove @_selector, @_modifier, callback

_.each ['where', 'modify', 'set', 'unset', 'add', 'push', 'pull', 'inc', 'skip', 'limit', 'range', 'fields', 'only', 'without', 'sort', 'sortUp', 'sortDown', 'multy'], (name) ->
	Mongo.Collection::[name] = (new DBOperator @)[name]

# servise for create or manage database
class DBService extends Factory.ExtClass

	# db collections
	@_collections: {}

	# return collection inctance
	# @params
	# 	name 	- [string] collection name
	#	options - [object] collection options
	@instance: (name, options) ->

# register service
Services.DB = DBService