Pony.fm/resources/assets/scripts/app/services/tracks.coffee

angular.module('ponyfm').factory('tracks', [
	'$rootScope', '$http', 'taxonomies'
	($rootScope, $http, taxonomies) ->
		filterDef = null
		trackCache = {}

		class Query
			cachedDef: null
			page: 1
			listeners: []

			constructor: (@availableFilters) ->
				@filters = {}
				@hasLoadedFilters = false
				@resetFilters()

			resetFilters: ->
				_.each @availableFilters, (filter, name) =>
					if filter.type == 'single'
						@filters[name] = _.find filter.values, (f) -> f.isDefault
					else
						@filters[name] = {title: 'Any', selectedArray: [], selectedObject: {}}

			isIdSelected: (type, id) ->
				@filters[type].selectedObject[id] != undefined

			listen: (listener) ->
				@listeners.push listener
				@cachedDef.done listener if @cachedDef

			setListFilter: (type, id) ->
				@cachedDef = null
				@page = 1
				filterToAdd = _.find @availableFilters[type].values, (f) -> `f.id == id`
				return if !filterToAdd

				filter = @filters[type]
				filter.selectedArray = [filterToAdd]
				filter.selectedObject = {}
				filter.selectedObject[id] = filterToAdd
				filter.title = filterToAdd.title

			clearFilter: (type) ->
				@cachedDef = null
				@page = 1
				filter = @availableFilters[type]

				if filter.type == 'single'
					@filters[type] = _.find filter.values, (f) -> f.isDefault
				else
					currentFilter = @filters[type]
					currentFilter.selectedArray = []
					currentFilter.selectedObject = {}
					currentFilter.title = 'Any'

			toggleListFilter: (type, id) ->
				@cachedDef = null
				@page = 1
				filter = @filters[type]

				if filter.selectedObject[id]
					delete filter.selectedObject[id]
					filter.selectedArray.splice _.indexOf(filter.selectedArray, (f) -> f.id == id), 1
				else
					filterToAdd = _.find @availableFilters[type].values, (f) -> `f.id == id`
					return if !filterToAdd
					filter.selectedObject[id] = filterToAdd
					filter.selectedArray.push filterToAdd

				if filter.selectedArray.length == 0
					filter.title = 'Any'
				else if filter.selectedArray.length == 1
					filter.title = filter.selectedArray[0].title
				else
					filter.title = filter.selectedArray.length + ' selected'

			setPage: (page) ->
				@page = page
				@cachedDef = null

			setFilter: (type, value) ->
				@cachedDef = null
				@page = 1
				@filters[type] = value

			toFilterString: ->
				parts = []
				_.each @availableFilters, (filter, name) =>
					filterName = filter.name
					if filter.type == 'single'
						return if @filters[name].query == ''
						parts.push(filterName + '-' + @filters[name].query)
					else
						return if @filters[name].selectedArray.length == 0
						parts.push(filterName + '-' + _.map(@filters[name].selectedArray, (f) -> f.id).join '-')

				return parts.join '!'

			fromFilterString: (str) ->
				@hasLoadedFilters = true
				@cachedDef = null
				@resetFilters()

				filters = (str || "").split '!'
				for queryFilter in filters
					parts = queryFilter.split '-'
					queryName = parts[0]

					filterName = null
					filter = null

					for name,f of @availableFilters
						continue if f.name != queryName
						filterName = name
						filter = f

					return if !filter

					if filter.type == 'single'
						filterToSet = _.find filter.values, (f) -> f.query == parts[1]
						filterToSet = (_.find filter.values, (f) -> f.isDefault) if filterToSet == null
						@setFilter filterName, filterToSet
					else
						@toggleListFilter filterName, id for id in _.rest parts, 1

			fetch: () ->
				return @cachedDef if @cachedDef
				@cachedDef = new $.Deferred()
				trackDef = @cachedDef

				query = '/api/web/tracks?'
				parts = ['page=' + @page]
				_.each @availableFilters, (filter, name) =>
					if filter.type == 'single'
						parts.push @filters[name].filter
					else
						queryName = filter.filterName
						for item in @filters[name].selectedArray
							parts.push queryName + "[]=" + item.id

				query += parts.join '&'
				$http.get(query).success (tracks) =>
					@tracks = tracks
					for listener in @listeners
						listener tracks


					trackDef.resolve tracks

				trackDef.promise()

		self =
			filters: {}

			fetch: (id, force) ->
				force = force || false
				return trackCache[id] if !force && trackCache[id]
				trackDef = new $.Deferred()
				$http.get('/api/web/tracks/' + id + '?log=true').success (track) ->
					trackDef.resolve track

				trackCache[id] = trackDef.promise()

			createQuery: -> new Query self.filters

			loadFilters: ->
				return filterDef if filterDef

				filterDef = new $.Deferred()
				self.filters.isVocal =
					type: 'single'
					name: 'vocal'
					values: [
						{title: 'Either', query: '', isDefault: true, filter: ''},
						{title: 'Yes', query: 'yes', isDefault: false, filter: 'is_vocal=true'},
						{title: 'No', query: 'no', isDefault: false, filter: 'is_vocal=false'}
					]

				self.filters.sort =
					type: 'single'
					name: 'sort'
					values: [
						{title: 'Latest', query: '', isDefault: true, filter: 'order=published_at,desc'},
						{title: 'Most Played', query: 'plays', isDefault: false, filter: 'order=play_count,desc'},
						{title: 'Most Downloaded', query: 'downloads', isDefault: false, filter: 'order=download_count,desc'},
						{title: 'Most Favourited', query: 'favourites', isDefault: false, filter: 'order=favourite_count,desc'}
					]

				self.filters.genres =
					type: 'list'
					name: 'genres'
					values: []
					filterName: 'genres'

				self.filters.trackTypes =
					type: 'list'
					name: 'types'
					values: []
					filterName: 'types'

				self.filters.showSongs =
					type: 'list'
					name: 'songs'
					values: []
					filterName: 'songs'

				taxonomies.refresh().done (taxes) ->
					for genre in taxes.genresWithTracks
						self.filters.genres.values.push
							title: genre.name
							id: genre.id

					for type in taxes.trackTypesWithTracks
						self.filters.trackTypes.values.push
							title: type.title
							id: type.id

					for song in taxes.showSongsWithTracks
						self.filters.showSongs.values.push
							title: song.title
							id: song.id

					self.mainQuery = self.createQuery()
					filterDef.resolve self

				filterDef.promise()

		self
])