# Copyright (c) 2022-2025, The Isaac Lab Project Developers (https://github.com/isaac-sim/IsaacLab/blob/main/CONTRIBUTORS.md).
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause

# ignore private usage of variables warning
# pyright: reportPrivateUsage=none

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

from isaaclab.app import AppLauncher

# launch omniverse app
simulation_app = AppLauncher(headless=True, enable_cameras=True).app

"""Rest everything follows."""

import copy
import numpy as np
import random
import torch

import isaacsim.core.utils.prims as prim_utils
import isaacsim.core.utils.stage as stage_utils
import omni.replicator.core as rep
import pytest
from isaacsim.core.prims import SingleGeometryPrim, SingleRigidPrim
from pxr import Gf, UsdGeom

import isaaclab.sim as sim_utils
from isaaclab.sensors.camera import TiledCamera, TiledCameraCfg


@pytest.fixture()
def setup_camera():
    """Create a blank new stage for each test."""
    camera_cfg = TiledCameraCfg(
        height=128,
        width=256,
        offset=TiledCameraCfg.OffsetCfg(pos=(0.0, 0.0, 4.0), rot=(0.0, 0.0, 1.0, 0.0), convention="ros"),
        prim_path="/World/Camera",
        update_period=0,
        data_types=["rgb", "distance_to_camera"],
        spawn=sim_utils.PinholeCameraCfg(
            focal_length=24.0, focus_distance=400.0, horizontal_aperture=20.955, clipping_range=(0.1, 1.0e5)
        ),
    )
    # Create a new stage
    stage_utils.create_new_stage()
    # Simulation time-step
    dt = 0.01
    # Load kit helper
    sim_cfg = sim_utils.SimulationCfg(dt=dt)
    sim = sim_utils.SimulationContext(sim_cfg)
    # populate scene
    _populate_scene()
    # load stage
    stage_utils.update_stage()
    yield camera_cfg, sim, dt
    # Teardown
    rep.vp_manager.destroy_hydra_textures("Replicator")
    # stop simulation
    # note: cannot use self.sim.stop() since it does one render step after stopping!! This doesn't make sense :(
    sim._timeline.stop()
    # clear the stage
    sim.clear_all_callbacks()
    sim.clear_instance()


def test_multi_tiled_camera_init(setup_camera):
    """Test initialization of multiple tiled cameras."""
    camera_cfg, sim, dt = setup_camera
    num_tiled_cameras = 3
    num_cameras_per_tiled_camera = 7

    tiled_cameras = []
    for i in range(num_tiled_cameras):
        for j in range(num_cameras_per_tiled_camera):
            prim_utils.create_prim(f"/World/Origin_{i}_{j}", "Xform")

        # Create camera
        camera_cfg = copy.deepcopy(camera_cfg)
        camera_cfg.prim_path = f"/World/Origin_{i}.*/CameraSensor"
        camera = TiledCamera(camera_cfg)
        tiled_cameras.append(camera)

        # Check simulation parameter is set correctly
        assert sim.has_rtx_sensors()

    # Play sim
    sim.reset()

    for i, camera in enumerate(tiled_cameras):
        # Check if camera is initialized
        assert camera.is_initialized
        # Check if camera prim is set correctly and that it is a camera prim
        assert camera._sensor_prims[1].GetPath().pathString == f"/World/Origin_{i}_1/CameraSensor"
        assert isinstance(camera._sensor_prims[0], UsdGeom.Camera)

    # Simulate for a few steps
    # note: This is a workaround to ensure that the textures are loaded.
    #   Check "Known Issues" section in the documentation for more details.
    for _ in range(5):
        sim.step()

    for camera in tiled_cameras:
        # Check buffers that exists and have correct shapes
        assert camera.data.pos_w.shape == (num_cameras_per_tiled_camera, 3)
        assert camera.data.quat_w_ros.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.quat_w_world.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.quat_w_opengl.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.intrinsic_matrices.shape == (num_cameras_per_tiled_camera, 3, 3)
        assert camera.data.image_shape == (camera.cfg.height, camera.cfg.width)

    # Simulate physics
    for _ in range(10):
        # Initialize data arrays
        rgbs = []
        distances = []

        # perform rendering
        sim.step()
        for i, camera in enumerate(tiled_cameras):
            # update camera
            camera.update(dt)
            # check image data
            for data_type, im_data in camera.data.output.items():
                if data_type == "rgb":
                    im_data = im_data.clone() / 255.0
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 3)
                    for j in range(num_cameras_per_tiled_camera):
                        assert (im_data[j]).mean().item() > 0.0
                    rgbs.append(im_data)
                elif data_type == "distance_to_camera":
                    im_data = im_data.clone()
                    im_data[torch.isinf(im_data)] = 0
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 1)
                    for j in range(num_cameras_per_tiled_camera):
                        assert im_data[j].mean().item() > 0.0
                    distances.append(im_data)

        # Check data from tiled cameras are consistent, assumes >1 tiled cameras
        for i in range(1, num_tiled_cameras):
            assert torch.abs(rgbs[0] - rgbs[i]).mean() < 0.05  # images of same color should be below 0.001
            assert torch.abs(distances[0] - distances[i]).mean() < 0.01  # distances of same scene should be 0

    for camera in tiled_cameras:
        del camera


def test_all_annotators_multi_tiled_camera(setup_camera):
    """Test initialization of multiple tiled cameras with all supported annotators."""
    camera_cfg, sim, dt = setup_camera
    all_annotator_types = [
        "rgb",
        "rgba",
        "depth",
        "distance_to_camera",
        "distance_to_image_plane",
        "normals",
        "motion_vectors",
        "semantic_segmentation",
        "instance_segmentation_fast",
        "instance_id_segmentation_fast",
    ]

    num_tiled_cameras = 2
    num_cameras_per_tiled_camera = 9

    tiled_cameras = []
    for i in range(num_tiled_cameras):
        for j in range(num_cameras_per_tiled_camera):
            prim_utils.create_prim(f"/World/Origin_{i}_{j}", "Xform")

        # Create camera
        camera_cfg = copy.deepcopy(camera_cfg)
        camera_cfg.data_types = all_annotator_types
        camera_cfg.prim_path = f"/World/Origin_{i}.*/CameraSensor"
        camera = TiledCamera(camera_cfg)
        tiled_cameras.append(camera)

        # Check simulation parameter is set correctly
        assert sim.has_rtx_sensors()

    # Play sim
    sim.reset()

    for i, camera in enumerate(tiled_cameras):
        # Check if camera is initialized
        assert camera.is_initialized
        # Check if camera prim is set correctly and that it is a camera prim
        assert camera._sensor_prims[1].GetPath().pathString == f"/World/Origin_{i}_1/CameraSensor"
        assert isinstance(camera._sensor_prims[0], UsdGeom.Camera)
        assert sorted(camera.data.output.keys()) == sorted(all_annotator_types)

    # Simulate for a few steps
    # note: This is a workaround to ensure that the textures are loaded.
    #   Check "Known Issues" section in the documentation for more details.
    for _ in range(5):
        sim.step()

    for camera in tiled_cameras:
        # Check buffers that exists and have correct shapes
        assert camera.data.pos_w.shape == (num_cameras_per_tiled_camera, 3)
        assert camera.data.quat_w_ros.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.quat_w_world.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.quat_w_opengl.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.intrinsic_matrices.shape == (num_cameras_per_tiled_camera, 3, 3)
        assert camera.data.image_shape == (camera.cfg.height, camera.cfg.width)

    # Simulate physics
    for _ in range(10):
        # perform rendering
        sim.step()
        for i, camera in enumerate(tiled_cameras):
            # update camera
            camera.update(dt)
            # check image data
            for data_type, im_data in camera.data.output.items():
                if data_type in ["rgb", "normals"]:
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 3)
                elif data_type in [
                    "rgba",
                    "semantic_segmentation",
                    "instance_segmentation_fast",
                    "instance_id_segmentation_fast",
                ]:
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 4)
                    for i in range(num_cameras_per_tiled_camera):
                        assert (im_data[i] / 255.0).mean().item() > 0.0
                elif data_type in ["motion_vectors"]:
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 2)
                    for i in range(num_cameras_per_tiled_camera):
                        assert im_data[i].mean().item() != 0.0
                elif data_type in ["depth", "distance_to_camera", "distance_to_image_plane"]:
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 1)
                    for i in range(num_cameras_per_tiled_camera):
                        assert im_data[i].mean().item() > 0.0

    for camera in tiled_cameras:
        # access image data and compare dtype
        output = camera.data.output
        info = camera.data.info
        assert output["rgb"].dtype == torch.uint8
        assert output["rgba"].dtype == torch.uint8
        assert output["depth"].dtype == torch.float
        assert output["distance_to_camera"].dtype == torch.float
        assert output["distance_to_image_plane"].dtype == torch.float
        assert output["normals"].dtype == torch.float
        assert output["motion_vectors"].dtype == torch.float
        assert output["semantic_segmentation"].dtype == torch.uint8
        assert output["instance_segmentation_fast"].dtype == torch.uint8
        assert output["instance_id_segmentation_fast"].dtype == torch.uint8
        assert isinstance(info["semantic_segmentation"], dict)
        assert isinstance(info["instance_segmentation_fast"], dict)
        assert isinstance(info["instance_id_segmentation_fast"], dict)

    for camera in tiled_cameras:
        del camera


def test_different_resolution_multi_tiled_camera(setup_camera):
    """Test multiple tiled cameras with different resolutions."""
    camera_cfg, sim, dt = setup_camera
    num_tiled_cameras = 2
    num_cameras_per_tiled_camera = 6

    tiled_cameras = []
    resolutions = [(16, 16), (23, 765)]
    for i in range(num_tiled_cameras):
        for j in range(num_cameras_per_tiled_camera):
            prim_utils.create_prim(f"/World/Origin_{i}_{j}", "Xform")

        # Create camera
        camera_cfg = copy.deepcopy(camera_cfg)
        camera_cfg.prim_path = f"/World/Origin_{i}.*/CameraSensor"
        camera_cfg.height, camera_cfg.width = resolutions[i]
        camera = TiledCamera(camera_cfg)
        tiled_cameras.append(camera)

        # Check simulation parameter is set correctly
        assert sim.has_rtx_sensors()

    # Play sim
    sim.reset()

    for i, camera in enumerate(tiled_cameras):
        # Check if camera is initialized
        assert camera.is_initialized
        # Check if camera prim is set correctly and that it is a camera prim
        assert camera._sensor_prims[1].GetPath().pathString == f"/World/Origin_{i}_1/CameraSensor"
        assert isinstance(camera._sensor_prims[0], UsdGeom.Camera)

    # Simulate for a few steps
    # note: This is a workaround to ensure that the textures are loaded.
    #   Check "Known Issues" section in the documentation for more details.
    for _ in range(5):
        sim.step()

    for camera in tiled_cameras:
        # Check buffers that exists and have correct shapes
        assert camera.data.pos_w.shape == (num_cameras_per_tiled_camera, 3)
        assert camera.data.quat_w_ros.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.quat_w_world.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.quat_w_opengl.shape == (num_cameras_per_tiled_camera, 4)
        assert camera.data.intrinsic_matrices.shape == (num_cameras_per_tiled_camera, 3, 3)
        assert camera.data.image_shape == (camera.cfg.height, camera.cfg.width)

    # Simulate physics
    for _ in range(10):
        # perform rendering
        sim.step()
        for i, camera in enumerate(tiled_cameras):
            # update camera
            camera.update(dt)
            # check image data
            for data_type, im_data in camera.data.output.items():
                if data_type == "rgb":
                    im_data = im_data.clone() / 255.0
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 3)
                    for j in range(num_cameras_per_tiled_camera):
                        assert (im_data[j]).mean().item() > 0.0
                elif data_type == "distance_to_camera":
                    im_data = im_data.clone()
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 1)
                    for j in range(num_cameras_per_tiled_camera):
                        assert im_data[j].mean().item() > 0.0

    for camera in tiled_cameras:
        del camera


def test_frame_offset_multi_tiled_camera(setup_camera):
    """Test frame offset issue with multiple tiled cameras"""
    camera_cfg, sim, dt = setup_camera
    num_tiled_cameras = 4
    num_cameras_per_tiled_camera = 4

    tiled_cameras = []
    for i in range(num_tiled_cameras):
        for j in range(num_cameras_per_tiled_camera):
            prim_utils.create_prim(f"/World/Origin_{i}_{j}", "Xform")

        # Create camera
        camera_cfg = copy.deepcopy(camera_cfg)
        camera_cfg.prim_path = f"/World/Origin_{i}.*/CameraSensor"
        camera = TiledCamera(camera_cfg)
        tiled_cameras.append(camera)

    # modify scene to be less stochastic
    stage = stage_utils.get_current_stage()
    for i in range(10):
        prim = stage.GetPrimAtPath(f"/World/Objects/Obj_{i:02d}")
        color = Gf.Vec3f(1, 1, 1)
        UsdGeom.Gprim(prim).GetDisplayColorAttr().Set([color])

    # play sim
    sim.reset()

    # simulate some steps first to make sure objects are settled
    for i in range(100):
        # step simulation
        sim.step()
        # update cameras
        for camera in tiled_cameras:
            camera.update(dt)

    # collect image data
    image_befores = [camera.data.output["rgb"].clone() / 255.0 for camera in tiled_cameras]

    # update scene
    for i in range(10):
        prim = stage.GetPrimAtPath(f"/World/Objects/Obj_{i:02d}")
        color = Gf.Vec3f(0, 0, 0)
        UsdGeom.Gprim(prim).GetDisplayColorAttr().Set([color])

    # update rendering
    sim.step()

    # update cameras
    for camera in tiled_cameras:
        camera.update(dt)

    # make sure the image is different
    image_afters = [camera.data.output["rgb"].clone() / 255.0 for camera in tiled_cameras]

    # check difference is above threshold
    for i in range(num_tiled_cameras):
        image_before = image_befores[i]
        image_after = image_afters[i]
        assert torch.abs(image_after - image_before).mean() > 0.03  # images of same color should be below 0.001

    for camera in tiled_cameras:
        del camera


def test_frame_different_poses_multi_tiled_camera(setup_camera):
    """Test multiple tiled cameras placed at different poses render different images."""
    camera_cfg, sim, dt = setup_camera
    num_tiled_cameras = 3
    num_cameras_per_tiled_camera = 4
    positions = [(0.0, 0.0, 4.0), (0.0, 0.0, 2.0), (0.0, 0.0, 3.0)]
    rotations = [(0.0, 0.0, 1.0, 0.0), (0.0, 0.0, 1.0, 0.0), (0.0, 0.0, 1.0, 0.0)]

    tiled_cameras = []
    for i in range(num_tiled_cameras):
        for j in range(num_cameras_per_tiled_camera):
            prim_utils.create_prim(f"/World/Origin_{i}_{j}", "Xform")

        # Create camera
        camera_cfg = copy.deepcopy(camera_cfg)
        camera_cfg.prim_path = f"/World/Origin_{i}.*/CameraSensor"
        camera_cfg.offset = TiledCameraCfg.OffsetCfg(pos=positions[i], rot=rotations[i], convention="ros")
        camera = TiledCamera(camera_cfg)
        tiled_cameras.append(camera)

    # Play sim
    sim.reset()

    # Simulate for a few steps
    # note: This is a workaround to ensure that the textures are loaded.
    #   Check "Known Issues" section in the documentation for more details.
    for _ in range(5):
        sim.step()

    # Simulate physics
    for _ in range(10):
        # Initialize data arrays
        rgbs = []
        distances = []

        # perform rendering
        sim.step()
        for i, camera in enumerate(tiled_cameras):
            # update camera
            camera.update(dt)
            # check image data
            for data_type, im_data in camera.data.output.items():
                if data_type == "rgb":
                    im_data = im_data.clone() / 255.0
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 3)
                    for j in range(num_cameras_per_tiled_camera):
                        assert (im_data[j]).mean().item() > 0.0
                    rgbs.append(im_data)
                elif data_type == "distance_to_camera":
                    im_data = im_data.clone()
                    # replace inf with 0
                    im_data[torch.isinf(im_data)] = 0
                    assert im_data.shape == (num_cameras_per_tiled_camera, camera.cfg.height, camera.cfg.width, 1)
                    for j in range(num_cameras_per_tiled_camera):
                        assert im_data[j].mean().item() > 0.0
                    distances.append(im_data)

        # Check data from tiled cameras are different, assumes >1 tiled cameras
        for i in range(1, num_tiled_cameras):
            assert torch.abs(rgbs[0] - rgbs[i]).mean() > 0.04  # images of same color should be below 0.001
            assert torch.abs(distances[0] - distances[i]).mean() > 0.01  # distances of same scene should be 0

    for camera in tiled_cameras:
        del camera


"""
Helper functions.
"""


def _populate_scene():
    """Add prims to the scene."""
    # TODO: this causes hang with Kit 107.3???
    # # Ground-plane
    # cfg = sim_utils.GroundPlaneCfg()
    # cfg.func("/World/defaultGroundPlane", cfg)
    # Lights
    cfg = sim_utils.SphereLightCfg()
    cfg.func("/World/Light/GreySphere", cfg, translation=(4.5, 3.5, 10.0))
    cfg.func("/World/Light/WhiteSphere", cfg, translation=(-4.5, 3.5, 10.0))
    # Random objects
    random.seed(0)
    for i in range(10):
        # sample random position
        position = np.random.rand(3) - np.asarray([0.05, 0.05, -1.0])
        position *= np.asarray([1.5, 1.5, 0.5])
        # create prim
        prim_type = random.choice(["Cube", "Sphere", "Cylinder"])
        prim = prim_utils.create_prim(
            f"/World/Objects/Obj_{i:02d}",
            prim_type,
            translation=position,
            scale=(0.25, 0.25, 0.25),
            semantic_label=prim_type,
        )
        # cast to geom prim
        geom_prim = getattr(UsdGeom, prim_type)(prim)
        # set random color
        color = Gf.Vec3f(random.random(), random.random(), random.random())
        geom_prim.CreateDisplayColorAttr()
        geom_prim.GetDisplayColorAttr().Set([color])
        # add rigid properties
        SingleGeometryPrim(f"/World/Objects/Obj_{i:02d}", collision=True)
        SingleRigidPrim(f"/World/Objects/Obj_{i:02d}", mass=5.0)
