overleaf/services/web/public/coffee/ide/editor/EditorManager.coffee

define [
	"ide/editor/Document"
	"ide/editor/directives/aceEditor"
	"ide/editor/controllers/SavingNotificationController"
], (Document) ->
	class EditorManager
		constructor: (@ide, @$scope) ->
			@$scope.editor = {
				sharejs_doc: null
				open_doc_id: null
				open_doc_name: null
				opening: true
				trackChanges: false
				wantTrackChanges: false
			}

			@$scope.$on "entity:selected", (event, entity) =>
				if (@$scope.ui.view != "history" and entity.type == "doc")
					@openDoc(entity)

			@$scope.$on "entity:deleted", (event, entity) =>
				if @$scope.editor.open_doc_id == entity.id
					return if !@$scope.project.rootDoc_id
					doc = @ide.fileTreeManager.findEntityById(@$scope.project.rootDoc_id)
					return if !doc?
					@openDoc(doc)

			initialized = false
			@$scope.$on "file-tree:initialized", () =>
				if !initialized
					initialized = true
					@autoOpenDoc()

			@$scope.$on "flush-changes", () =>
				Document.flushAll()
			
			@$scope.$watch "editor.wantTrackChanges", (value) =>
				return if !value?
				@_syncTrackChangesState(@$scope.editor.sharejs_doc)
			
			@$scope.$watch "project.features.trackChanges", (trackChangesFeature) =>
				return if !trackChangesFeature?
				@$scope.editor.wantTrackChanges = window.trackChangesEnabled and trackChangesFeature

		autoOpenDoc: () ->
			open_doc_id = 
				@ide.localStorage("doc.open_id.#{@$scope.project_id}") or
				@$scope.project.rootDoc_id
			return if !open_doc_id?
			doc = @ide.fileTreeManager.findEntityById(open_doc_id)
			return if !doc?
			@openDoc(doc)

		openDocId: (doc_id, options = {}) ->
			doc = @ide.fileTreeManager.findEntityById(doc_id)
			return if !doc?
			@openDoc(doc, options)

		openDoc: (doc, options = {}) ->
			sl_console.log "[openDoc] Opening #{doc.id}"
			@$scope.ui.view = "editor"

			done = () =>
				if options.gotoLine?
					# allow Ace to display document before moving, delay until next tick
					# added delay to make this happen later that gotoStoredPosition in
					# CursorPositionManager
					setTimeout () =>
						@$scope.$broadcast "editor:gotoLine", options.gotoLine, options.gotoColumn
					, 0
				else if options.gotoOffset?
					setTimeout () =>
						@$scope.$broadcast "editor:gotoOffset", options.gotoOffset
					, 0
					

			if doc.id == @$scope.editor.open_doc_id and !options.forceReopen
				@$scope.$apply () =>
					done()
				return

			@$scope.editor.open_doc_id = doc.id
			@$scope.editor.open_doc_name = doc.name

			@ide.localStorage "doc.open_id.#{@$scope.project_id}", doc.id
			@ide.fileTreeManager.selectEntity(doc)

			@$scope.editor.opening = true
			@_openNewDocument doc, (error, sharejs_doc) =>
				if error?
					@ide.showGenericMessageModal(
						"Error opening document"
						"Sorry, something went wrong opening this document. Please try again."
					)
					return
				
				@_syncTrackChangesState(sharejs_doc)

				@$scope.$broadcast "doc:opened"

				@$scope.$apply () =>
					@$scope.editor.opening = false
					@$scope.editor.sharejs_doc = sharejs_doc
					done()

		_openNewDocument: (doc, callback = (error, sharejs_doc) ->) ->
			sl_console.log "[_openNewDocument] Opening..."
			current_sharejs_doc = @$scope.editor.sharejs_doc
			if current_sharejs_doc?
				sl_console.log "[_openNewDocument] Leaving existing open doc..."
				current_sharejs_doc.leaveAndCleanUp()
				@_unbindFromDocumentEvents(current_sharejs_doc)

			new_sharejs_doc = Document.getDocument @ide, doc.id

			new_sharejs_doc.join (error) =>
				return callback(error) if error?
				@_bindToDocumentEvents(doc, new_sharejs_doc)
				callback null, new_sharejs_doc


		_bindToDocumentEvents: (doc, sharejs_doc) ->
			sharejs_doc.on "error", (error, meta) =>
				if error?.message?
					message = error.message
				else if typeof error == "string"
					message = error
				else
					message = ""
				if message.match "maxDocLength"
					@ide.showGenericMessageModal(
						"Document Too Long"
						"Sorry, this file is too long to be edited manually. Please upload it directly."
					)
				else if message.match "too many comments or tracked changes"
					@ide.showGenericMessageModal(
						"Too many comments or tracked changes"
						"Sorry, this file has too many comments or tracked changes. Please try accepting or rejecting some existing changes, or resolving and deleting some comments."
					)
				else
					@ide.socket.disconnect()
					@ide.reportError(error, meta)
					@ide.showGenericMessageModal(
						"Out of sync"
						"Sorry, this file has gone out of sync and we need to do a full refresh. <br> <a href='/learn/Kb/Editor_out_of_sync_problems'>Please see this help guide for more information</a>"
					)
				@openDoc(doc, forceReopen: true)

			sharejs_doc.on "externalUpdate", (update) =>
				return if @_ignoreExternalUpdates
				@ide.showGenericMessageModal(
					"Document Updated Externally"
					"This document was just updated externally. Any recent changes you have made may have been overwritten. To see previous versions please look in the history."
				)

		_unbindFromDocumentEvents: (document) ->
			document.off()

		getCurrentDocValue: () ->
			@$scope.editor.sharejs_doc?.getSnapshot()

		getCurrentDocId: () ->
			@$scope.editor.open_doc_id
			
		startIgnoringExternalUpdates: () ->
			@_ignoreExternalUpdates = true
			
		stopIgnoringExternalUpdates: () ->
			@_ignoreExternalUpdates = false
		
		_syncTimeout: null
		_syncTrackChangesState: (doc) ->
			return if !doc?

			if @_syncTimeout?
				clearTimeout @_syncTimeout
				@_syncTimeout = null

			want = @$scope.editor.wantTrackChanges
			have = doc.getTrackingChanges()
			if want == have
				@$scope.editor.trackChanges = want
				return

			do tryToggle = () =>
				saved = !doc.getInflightOp()? and !doc.getPendingOp()?
				if saved
					doc.setTrackingChanges(want)
					@$scope.$apply () =>
						@$scope.editor.trackChanges = want
				else
					@_syncTimeout = setTimeout tryToggle, 100