# This test runs through the steps described in the python trace tutorial
# to appear in a Kitware Source newsletter.
#
#  Trace is enabled and the following actions are captured and then replayed:
#
#  A sphere source is created then a PythonAnnotation filter is created.
#  Its expression contains a '\n'.
#

from paraview.simple import *
from paraview import smtrace
from paraview import smtesting
import sys

LoadPalette("BlueGrayBackground")

settings = servermanager.vtkPVGeneralSettings()
settings.SetScalarBarMode(settings.MANUAL_SCALAR_BARS)

# Process command line args and get temp dir
smtesting.ProcessCommandLineArguments()
tempDir = smtesting.TempDir

# Create a render view before starting trace
ren = CreateRenderView()

tracer = smtrace.ScopedTracer()

########################################################
# Begin build pipeline
def create_pipeline():
    w = Sphere()
    Show()
    Render()

    # note property changes won't be recorded directly so don't do any outside the
    # constructor and expect that to work.
    python_annotation = PythonAnnotation(
        registrationName="PythonAnnotation1", Input=w, Expression='"Foo\\nBar"'
    )
    Show()
    # Hide(w)
    Render()


with tracer:
    create_pipeline()

# End build pipeline
########################################################

# Stop trace and grab the trace output string
trace_string = tracer.last_trace()

# The multiline expression in the PythonAnnotation should not be processed
# but taken 'as is'
assert r"""Expression='"Foo\\nBar"'""" in trace_string

# Uncomment these lines to print the trace string or save it to a file
# smtrace.save_trace(tempDir + "/PythonSMTraceTest1.py")

# Clear all the sources
for source in GetSources().values():
    Delete(source)

if len(ren.Representations) != 0:
    print("View should not have any representations at this point!")
    sys.exit(1)

# Confirm that the clip filter has been removed
if GetSources():
    print("All sources should have be removed.")
    sys.exit(1)

# change camera to confirm that trace restores it.
ren.CameraPosition = [-1, -1, -1]
Render()

# Compile the trace code and run it
code = compile(trace_string, "<string>", "exec")
exec(code)

# Do a screenshot regression test
if not smtesting.DoRegressionTesting(ren.SMProxy):
    raise smtesting.TestError("Image comparison failed.")
