#!/usr/bin/env python
from vtk import *
import os.path
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()

data_dir = VTK_DATA_ROOT + "/Data/Infovis/SQLite/"
if not os.path.exists(data_dir):
  data_dir = VTK_DATA_ROOT + "/Data/Infovis/SQLite/"
if not os.path.exists(data_dir):
  data_dir = "../../../../../../VTKData/Data/Infovis/SQLite/"
sqlite_file = data_dir + "SmallEmailTest.db"

database = vtkSQLDatabase.CreateFromURL("sqlite://" + sqlite_file)
database.Open("")

edge_query = database.GetQueryInstance()
edge_query.SetQuery("select source, target from emails")

vertex_query = database.GetQueryInstance()
vertex_query.SetQuery("select Name, Job, Age from employee")

edge_table = vtkRowQueryToTable()
edge_table.SetQuery(edge_query)
edge_query.FastDelete()

vertex_table = vtkRowQueryToTable()
vertex_table.SetQuery(vertex_query)
vertex_query.FastDelete()

graph = vtkTableToGraph()
graph.AddInputConnection(edge_table.GetOutputPort())
graph.AddLinkVertex("source", "Name", False)
graph.AddLinkVertex("target", "Name", False)
graph.AddLinkEdge("source", "target")
graph.SetVertexTableConnection(vertex_table.GetOutputPort())


view = vtkGraphLayoutView()
view.AddRepresentationFromInputConnection(graph.GetOutputPort())
view.SetVertexLabelArrayName("label")
view.SetVertexLabelVisibility(True)
view.SetVertexColorArrayName("Age")
view.SetColorVertices(True)
view.SetLayoutStrategyToSimple2D()

# Add my new lay strategy
# myFoo = vtkCircularLayoutStrategy()
# view.SetLayoutStrategy(myFoo)

theme = vtkViewTheme.CreateMellowTheme()
theme.SetCellColor(.2,.2,.6)
theme.SetLineWidth(5)
theme.SetPointSize(10)
view.ApplyViewTheme(theme)
view.SetVertexLabelFontSize(20)
theme.FastDelete()

view.GetRenderWindow().SetSize(600, 600)
view.ResetCamera()
view.Render()
view.GetInteractor().Start()