#
# Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#
# NVIDIA CORPORATION, its affiliates and licensors retain all intellectual
# property and proprietary rights in and to this material, related
# documentation and any modifications thereto. Any use, reproduction,
# disclosure or distribution of this material and related documentation
# without an express license agreement from NVIDIA CORPORATION or
# its affiliates is strictly prohibited.
#
from __future__ import annotations

# Standard Library
from dataclasses import dataclass
from typing import List, Optional

# Third Party
import torch
from torch.profiler import record_function

# CuRobo
from curobo.geom.cv import (
    get_projection_rays,
    project_depth_using_rays,
    project_pointcloud_to_depth,
)
from curobo.types.math import Pose


@dataclass
class CameraObservation:
    name: str = "camera_image"
    #: rgb image format is BxHxWxchannels
    rgb_image: Optional[torch.Tensor] = None
    depth_image: Optional[torch.Tensor] = None
    image_segmentation: Optional[torch.Tensor] = None
    projection_matrix: Optional[torch.Tensor] = None
    projection_rays: Optional[torch.Tensor] = None
    resolution: Optional[List[int]] = None
    pose: Optional[Pose] = None
    intrinsics: Optional[torch.Tensor] = None
    timestamp: Optional[torch.Tensor] = None

    def filter_depth(self, distance: float = 0.01):
        self.depth_image = torch.where(self.depth_image < distance, 0, self.depth_image)

    @property
    def shape(self):
        return self.rgb_image.shape

    @record_function("camera/copy_")
    def copy_(self, new_data: CameraObservation):
        if self.rgb_image is not None:
            self.rgb_image.copy_(new_data.rgb_image)
        if self.depth_image is not None:
            self.depth_image.copy_(new_data.depth_image)
        if self.image_segmentation is not None:
            self.image_segmentation.copy_(new_data.image_segmentation)
        if self.projection_matrix is not None:
            self.projection_matrix.copy_(new_data.projection_matrix)
        if self.projection_rays is not None:
            self.projection_rays.copy_(new_data.projection_rays)
        if self.pose is not None:
            self.pose.copy_(new_data.pose)
        if self.timestamp is not None:
            self.timestamp.copy_(new_data.timestamp)
        self.resolution = new_data.resolution

    @record_function("camera/clone")
    def clone(self):

        return CameraObservation(
            depth_image=self.depth_image.clone() if self.depth_image is not None else None,
            rgb_image=self.rgb_image.clone() if self.rgb_image is not None else None,
            intrinsics=self.intrinsics.clone() if self.intrinsics is not None else None,
            resolution=self.resolution,
            pose=self.pose.clone() if self.pose is not None else None,
            timestamp=self.timestamp.clone() if self.timestamp is not None else None,
            image_segmentation=(
                self.image_segmentation.clone() if self.image_segmentation is not None else None
            ),
            projection_matrix=(
                self.projection_matrix.clone() if self.projection_matrix is not None else None
            ),
            projection_rays=(
                self.projection_rays.clone() if self.projection_rays is not None else None
            ),
            name=self.name,
        )

    def to(self, device: torch.device):

        self.rgb_image = self.rgb_image.to(device=device) if self.rgb_image is not None else None
        self.depth_image = (
            self.depth_image.to(device=device) if self.depth_image is not None else None
        )

        self.image_segmentation = (
            self.image_segmentation.to(device=device)
            if self.image_segmentation is not None
            else None
        )
        self.projection_matrix = (
            self.projection_matrix.to(device=device) if self.projection_matrix is not None else None
        )
        self.projection_rays = (
            self.projection_rays.to(device=device) if self.projection_rays is not None else None
        )
        self.intrinsics = self.intrinsics.to(device=device) if self.intrinsics is not None else None
        self.timestamp = self.timestamp.to(device=device) if self.timestamp is not None else None
        self.pose = self.pose.to(device=device) if self.pose is not None else None

        return self

    def get_pointcloud(self):
        if self.projection_rays is None:
            self.update_projection_rays()
        depth_image = self.depth_image
        if len(self.depth_image.shape) == 2:
            depth_image = self.depth_image.unsqueeze(0)
        point_cloud = project_depth_using_rays(depth_image, self.projection_rays)
        return point_cloud

    def get_image_from_pointcloud(self, pointcloud, output_image: Optional[torch.Tensor] = None):
        if output_image is None:
            output_image = torch.zeros(
                (self.depth_image.shape[0], self.depth_image.shape[1]),
                dtype=pointcloud.dtype,
                device=pointcloud.device,
            )

        depth_image = project_pointcloud_to_depth(pointcloud, output_image=output_image)
        return depth_image

    def update_projection_rays(self):
        intrinsics = self.intrinsics
        if len(intrinsics.shape) == 2:
            intrinsics = intrinsics.unsqueeze(0)
        project_rays = get_projection_rays(
            self.depth_image.shape[-2], self.depth_image.shape[-1], intrinsics
        )

        if self.projection_rays is None:
            self.projection_rays = project_rays

        self.projection_rays.copy_(project_rays)

    def stack(self, new_observation: CameraObservation, dim: int = 0):
        rgb_image = (
            torch.stack((self.rgb_image, new_observation.rgb_image), dim=dim)
            if self.rgb_image is not None
            else None
        )
        depth_image = (
            torch.stack((self.depth_image, new_observation.depth_image), dim=dim)
            if self.depth_image is not None
            else None
        )
        image_segmentation = (
            torch.stack((self.image_segmentation, new_observation.image_segmentation), dim=dim)
            if self.image_segmentation is not None
            else None
        )
        projection_matrix = (
            torch.stack((self.projection_matrix, new_observation.projection_matrix), dim=dim)
            if self.projection_matrix is not None
            else None
        )
        projection_rays = (
            torch.stack((self.projection_rays, new_observation.projection_rays), dim=dim)
            if self.projection_rays is not None
            else None
        )
        resolution = self.resolution

        pose = self.pose.stack(new_observation.pose) if self.pose is not None else None

        intrinsics = (
            torch.stack((self.intrinsics, new_observation.intrinsics), dim=dim)
            if self.intrinsics is not None
            else None
        )
        timestamp = (
            torch.stack((self.timestamp, new_observation.timestamp), dim=dim)
            if self.timestamp is not None
            else None
        )
        return CameraObservation(
            name=self.name,
            rgb_image=rgb_image,
            depth_image=depth_image,
            image_segmentation=image_segmentation,
            projection_matrix=projection_matrix,
            projection_rays=projection_rays,
            resolution=resolution,
            pose=pose,
            intrinsics=intrinsics,
            timestamp=timestamp,
        )
