import FreeCADGui as Gui
import FreeCAD as App

class AHB_New_Step:
	def GetResources(self):
		return {"MenuText": "New Step",
				"ToolTip": "Creates a page for the next step (first, select the view of the preceding step, if any)",
				"Pixmap": ""
				}

	def IsActive(self):
		return True

	def Activated(self):
		import re
		import os
		import sys
		from PySide.QtCore import QTimer
		
		workbench = Gui.getWorkbench("AssemblyHandbookWorkbench") #: :type workbench: AssemblyHandbookWorkbench
		
		if len(Gui.Selection.getSelection()) > 1:
			raise Exception("Please either select exactly one TechDraw view, or nothing at all")

		prev_view = None if len(Gui.Selection.getSelection()) == 0 else Gui.Selection.getSelection()[0]
		if prev_view is not None and prev_view.TypeId != 'TechDraw::DrawViewPart':
			raise Exception("Selected object is not a TechDraw view")
		
		doc = App.ActiveDocument if prev_view is None else prev_view.Document
		
		freecad_path = os.path.normpath(os.path.dirname(sys.executable) + '/..') # 'usr' absolute path 
		
		if prev_view is None:
			step_number = 1
			keep_updated = False
			template_file_name = freecad_path + '/share/Mod/TechDraw/Templates/A4_Landscape_blank.svg'
			parent_group = None
		else:
			prev_page = workbench.techDrawExtensions.getViewPage(prev_view)
			prev_page_group = prev_page.getParentGroup()
			if prev_page_group is not None:
				parent_group = prev_page_group.getParentGroup()
			keep_updated = prev_page.KeepUpdated
			template_file_name = prev_page.Template.Template
			numbers = re.findall(r'\d+', prev_page.Label)
			if len(numbers) == 0: prev_number = 0
			else: prev_number = max(1, int(numbers[-1]))
			step_number = prev_number + 1
		
		step_num_str = str(step_number).zfill(3)
		
		group = doc.addObject('App::DocumentObjectGroup', 'Etape' + step_num_str)
		if parent_group is not None:
			parent_group.addObject(group)
		
		page_name = 'Etape' + step_num_str + '_Page'
		page = doc.addObject('TechDraw::DrawPage', page_name)
		group.addObject(page)
		if page.KeepUpdated != keep_updated: page.KeepUpdated = keep_updated
		template = doc.addObject('TechDraw::DrawSVGTemplate', 'Template')
		template.Template = template_file_name
		page.Template = template
		
		view = doc.addObject('TechDraw::DrawViewPart', 'View')
		view.Perspective = False
		view.CoarseView = True
		view.addProperty("App::PropertyString", "Assembly_handbook_PreviousStepView", "Assembly_handbook")
		if prev_view is None:
			try:
				workbench.techDrawExtensions.setCurrentViewDirection(view)
			except:
				pass
		else:
			view.Assembly_handbook_PreviousStepView = prev_view.Name
			view.X = prev_view.X
			view.Y = prev_view.Y
			view.Direction = prev_view.Direction
			view.XDirection = prev_view.XDirection
			view.ScaleType = prev_view.ScaleType
			view.Scale = prev_view.Scale
			view.XSource = prev_view.XSource
		
		page.addView(view)
		view.recompute()
		
		# search for views after the prev view to relink them after the new view (i.e. we insert the new view as an intermediate step)
		# TODO: re-number next steps if needed
		if prev_view is not None:
			for obj in doc.Objects:
				if obj != view and obj.TypeId == 'TechDraw::DrawViewPart' and 'Assembly_handbook_PreviousStepView' in obj.PropertiesList and obj.Assembly_handbook_PreviousStepView == prev_view.Name:
					obj.Assembly_handbook_PreviousStepView = view.Name
					print(obj.Label + ' has been moved after the new step')
		
		if len(view.XSource) > 0:
			workbench.techDrawExtensions.forceRedrawPage(page)
		
		Gui.Selection.clearSelection()
		Gui.Selection.addSelection(page)

from ahb_command import AHB_CommandWrapper
AHB_CommandWrapper.addGuiCommand('AHB_new_step', AHB_New_Step())