# Copyright (c) 2022-2023, The ORBIT Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause


from __future__ import annotations

"""Launch Isaac Sim Simulator first."""

from omni.isaac.kit import SimulationApp

# launch omniverse app
config = {"headless": True}
simulation_app = SimulationApp(config)

"""Rest everything follows."""

import torch
import traceback
import unittest

import carb
import omni.isaac.core.utils.stage as stage_utils
from omni.isaac.core.simulation_context import SimulationContext

import omni.isaac.orbit.sim as sim_utils
from omni.isaac.orbit.markers import VisualizationMarkers, VisualizationMarkersCfg
from omni.isaac.orbit.markers.config import FRAME_MARKER_CFG, POSITION_GOAL_MARKER_CFG
from omni.isaac.orbit.utils.math import random_orientation
from omni.isaac.orbit.utils.timer import Timer


class TestUsdVisualizationMarkers(unittest.TestCase):
    """Test fixture for the VisualizationMarker class."""

    def setUp(self):
        """Create a blank new stage for each test."""
        # Simulation time-step
        self.dt = 0.01
        # Open a new stage
        stage_utils.create_new_stage()
        # Load kit helper
        self.sim = SimulationContext(physics_dt=self.dt, rendering_dt=self.dt, backend="torch", device="cuda:0")

    def tearDown(self) -> None:
        """Stops simulator after each test."""
        # stop simulation
        self.sim.stop()
        # close stage
        stage_utils.close_stage()
        # clear the simulation context
        self.sim.clear_instance()

    def test_instantiation(self):
        """Test that the class can be initialized properly."""
        config = VisualizationMarkersCfg(
            prim_path="/World/Visuals/test",
            markers={
                "test": sim_utils.SphereCfg(radius=1.0),
            },
        )
        test_marker = VisualizationMarkers(config)
        print(test_marker)
        # check number of markers
        self.assertEqual(test_marker.num_prototypes, 1)

    def test_usd_marker(self):
        """Test with marker from a USD."""
        # create a marker
        config = FRAME_MARKER_CFG.replace(prim_path="/World/Visuals/test_frames")
        test_marker = VisualizationMarkers(config)

        # play the simulation
        self.sim.reset()
        # create a buffer
        num_frames = 0
        # run with randomization of poses
        for count in range(1000):
            # sample random poses
            if count % 50 == 0:
                num_frames = torch.randint(10, 1000, (1,)).item()
                frame_translations = torch.randn((num_frames, 3))
                frame_rotations = random_orientation(num_frames, device=self.sim.device)
                # set the marker
                test_marker.visualize(translations=frame_translations, orientations=frame_rotations)
            # update the kit
            self.sim.step()
            # asset that count is correct
            self.assertEqual(test_marker.count, num_frames)

    def test_usd_marker_color(self):
        """Test with marker from a USD with its color modified."""
        # create a marker
        config = FRAME_MARKER_CFG.copy()
        config.prim_path = "/World/Visuals/test_frames"
        config.markers["frame"].visual_material = sim_utils.PreviewSurfaceCfg(diffuse_color=(1.0, 0.0, 0.0))
        test_marker = VisualizationMarkers(config)

        # play the simulation
        self.sim.reset()
        # run with randomization of poses
        for count in range(1000):
            # sample random poses
            if count % 50 == 0:
                num_frames = torch.randint(10, 1000, (1,)).item()
                frame_translations = torch.randn((num_frames, 3))
                frame_rotations = random_orientation(num_frames, device=self.sim.device)
                # set the marker
                test_marker.visualize(translations=frame_translations, orientations=frame_rotations)
            # update the kit
            self.sim.step()

    def test_multiple_prototypes_marker(self):
        """Test with multiple prototypes of spheres."""
        # create a marker
        config = POSITION_GOAL_MARKER_CFG.replace(prim_path="/World/Visuals/test_protos")
        test_marker = VisualizationMarkers(config)

        # play the simulation
        self.sim.reset()
        # run with randomization of poses
        for count in range(1000):
            # sample random poses
            if count % 50 == 0:
                num_frames = torch.randint(100, 1000, (1,)).item()
                frame_translations = torch.randn((num_frames, 3))
                # randomly choose a prototype
                marker_indices = torch.randint(0, test_marker.num_prototypes, (num_frames,))
                # set the marker
                test_marker.visualize(translations=frame_translations, marker_indices=marker_indices)
            # update the kit
            self.sim.step()

    def test_visualization_time_based_on_prototypes(self):
        """Test with time taken when number of prototypes is increased."""

        # create a marker
        config = POSITION_GOAL_MARKER_CFG.replace(prim_path="/World/Visuals/test_protos")
        test_marker = VisualizationMarkers(config)

        # play the simulation
        self.sim.reset()
        # number of frames
        num_frames = 4096

        # check that visibility is true
        self.assertTrue(test_marker.is_visible())
        # run with randomization of poses and indices
        frame_translations = torch.randn((num_frames, 3))
        marker_indices = torch.randint(0, test_marker.num_prototypes, (num_frames,))
        # set the marker
        with Timer("Marker visualization with explicit indices") as timer:
            test_marker.visualize(translations=frame_translations, marker_indices=marker_indices)
            # save the time
            time_with_marker_indices = timer.time_elapsed

        with Timer("Marker visualization with no indices") as timer:
            test_marker.visualize(translations=frame_translations)
            # save the time
            time_with_no_marker_indices = timer.time_elapsed

        # update the kit
        self.sim.step()
        # check that the time is less
        self.assertLess(time_with_no_marker_indices, time_with_marker_indices)

    def test_visualization_time_based_on_visibility(self):
        """Test with visibility of markers. When invisible, the visualize call should return."""

        # create a marker
        config = POSITION_GOAL_MARKER_CFG.replace(prim_path="/World/Visuals/test_protos")
        test_marker = VisualizationMarkers(config)

        # play the simulation
        self.sim.reset()
        # number of frames
        num_frames = 4096

        # check that visibility is true
        self.assertTrue(test_marker.is_visible())
        # run with randomization of poses and indices
        frame_translations = torch.randn((num_frames, 3))
        marker_indices = torch.randint(0, test_marker.num_prototypes, (num_frames,))
        # set the marker
        with Timer("Marker visualization") as timer:
            test_marker.visualize(translations=frame_translations, marker_indices=marker_indices)
            # save the time
            time_with_visualization = timer.time_elapsed

        # update the kit
        self.sim.step()
        # make invisible
        test_marker.set_visibility(False)

        # check that visibility is false
        self.assertFalse(test_marker.is_visible())
        # run with randomization of poses and indices
        frame_translations = torch.randn((num_frames, 3))
        marker_indices = torch.randint(0, test_marker.num_prototypes, (num_frames,))
        # set the marker
        with Timer("Marker no visualization") as timer:
            test_marker.visualize(translations=frame_translations, marker_indices=marker_indices)
            # save the time
            time_with_no_visualization = timer.time_elapsed

        # check that the time is less
        self.assertLess(time_with_no_visualization, time_with_visualization)


if __name__ == "__main__":
    try:
        unittest.main()
    except Exception as err:
        carb.log_error(err)
        carb.log_error(traceback.format_exc())
        raise
    finally:
        # close sim app
        simulation_app.close()
