# final one
import torch
import spaces
import gradio as gr
import os
import numpy as np
import trimesh
import mcubes
import imageio
from torchvision.utils import save_image
from PIL import Image
import io
from transformers import AutoModel, AutoConfig
from rembg import remove, new_session
from functools import partial
from kiui.op import recenter
import kiui
from gradio_litmodel3d import LitModel3D
import shutil
from fastapi import FastAPI, File, UploadFile, Form
from fastapi.responses import StreamingResponse
from pydantic import BaseModel
from pydantic import Field
from typing import Optional
import logging
import os
import boto3
import uuid
from fastapi import FastAPI, File, UploadFile, HTTPException
from fastapi.responses import JSONResponse
import datetime
import tempfile


app = FastAPI()


ACCESS = os.getenv("ACCESS")
SECRET = os.getenv("SECRET")
bedrock = boto3.client(service_name='bedrock', aws_access_key_id = ACCESS, aws_secret_access_key = SECRET, region_name='us-east-1')
bedrock_runtime = boto3.client(service_name='bedrock-runtime', aws_access_key_id = ACCESS, aws_secret_access_key = SECRET, region_name='us-east-1')
s3_client = boto3.client('s3',aws_access_key_id = ACCESS, aws_secret_access_key = SECRET, region_name='us-east-1')


def find_cuda():
    # Check if CUDA_HOME or CUDA_PATH environment variables are set
    cuda_home = os.environ.get('CUDA_HOME') or os.environ.get('CUDA_PATH')

    if cuda_home and os.path.exists(cuda_home):
        return cuda_home

    # Search for the nvcc executable in the system's PATH
    nvcc_path = shutil.which('nvcc')

    if nvcc_path:
        # Remove the 'bin/nvcc' part to get the CUDA installation path
        cuda_path = os.path.dirname(os.path.dirname(nvcc_path))
        return cuda_path

    return None

cuda_path = find_cuda()

if cuda_path:
    print(f"CUDA installation found at: {cuda_path}")
else:
    print("CUDA installation not found")
    
# we load the pre-trained model from HF
class LRMGeneratorWrapper:
    def __init__(self):
        self.config = AutoConfig.from_pretrained("facebook/vfusion3d", trust_remote_code=True)
        self.model = AutoModel.from_pretrained("facebook/vfusion3d", trust_remote_code=True)
        self.device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
        self.model.to(self.device)
        self.model.eval()

    def forward(self, image, camera):
        return self.model(image, camera)

model_wrapper = LRMGeneratorWrapper()

# we preprocess the input image
def preprocess_image(image, source_size):
    session = new_session("isnet-general-use")
    rembg_remove = partial(remove, session=session)
    image = np.array(image)
    image = rembg_remove(image)
    mask = rembg_remove(image, only_mask=True)
    image = recenter(image, mask, border_ratio=0.20)
    image = torch.tensor(image).permute(2, 0, 1).unsqueeze(0) / 255.0
    if image.shape[1] == 4:
        image = image[:, :3, ...] * image[:, 3:, ...] + (1 - image[:, 3:, ...])
    image = torch.nn.functional.interpolate(image, size=(source_size, source_size), mode='bicubic', align_corners=True)
    image = torch.clamp(image, 0, 1)
    return image

# Copied from https://github.com/facebookresearch/vfusion3d/blob/main/lrm/cam_utils.py and
# https://github.com/facebookresearch/vfusion3d/blob/main/lrm/inferrer.py
def get_normalized_camera_intrinsics(intrinsics: torch.Tensor):
    fx, fy = intrinsics[:, 0, 0], intrinsics[:, 0, 1]
    cx, cy = intrinsics[:, 1, 0], intrinsics[:, 1, 1]
    width, height = intrinsics[:, 2, 0], intrinsics[:, 2, 1]
    fx, fy = fx / width, fy / height
    cx, cy = cx / width, cy / height
    return fx, fy, cx, cy

def build_camera_principle(RT: torch.Tensor, intrinsics: torch.Tensor):
    fx, fy, cx, cy = get_normalized_camera_intrinsics(intrinsics)
    return torch.cat([
        RT.reshape(-1, 12),
        fx.unsqueeze(-1), fy.unsqueeze(-1), cx.unsqueeze(-1), cy.unsqueeze(-1),
    ], dim=-1)

def _default_intrinsics():
    fx = fy = 384
    cx = cy = 256
    w = h = 512
    intrinsics = torch.tensor([
        [fx, fy],
        [cx, cy],
        [w, h],
    ], dtype=torch.float32)
    return intrinsics

def _default_source_camera(batch_size: int = 1):
    canonical_camera_extrinsics = torch.tensor([[
        [0, 0, 1, 1],
        [1, 0, 0, 0],
        [0, 1, 0, 0],
    ]], dtype=torch.float32)
    canonical_camera_intrinsics = _default_intrinsics().unsqueeze(0)
    source_camera = build_camera_principle(canonical_camera_extrinsics, canonical_camera_intrinsics)
    return source_camera.repeat(batch_size, 1)

def _center_looking_at_camera_pose(camera_position: torch.Tensor, look_at: torch.Tensor = None, up_world: torch.Tensor = None):
    """
    camera_position: (M, 3)
    look_at: (3)
    up_world: (3)
    return: (M, 3, 4)
    """
    # by default, looking at the origin and world up is pos-z
    if look_at is None:
        look_at = torch.tensor([0, 0, 0], dtype=torch.float32)
    if up_world is None:
        up_world = torch.tensor([0, 0, 1], dtype=torch.float32)
    look_at = look_at.unsqueeze(0).repeat(camera_position.shape[0], 1)
    up_world = up_world.unsqueeze(0).repeat(camera_position.shape[0], 1)

    z_axis = camera_position - look_at
    z_axis = z_axis / z_axis.norm(dim=-1, keepdim=True)
    x_axis = torch.cross(up_world, z_axis)
    x_axis = x_axis / x_axis.norm(dim=-1, keepdim=True)
    y_axis = torch.cross(z_axis, x_axis)
    y_axis = y_axis / y_axis.norm(dim=-1, keepdim=True)
    extrinsics = torch.stack([x_axis, y_axis, z_axis, camera_position], dim=-1)
    return extrinsics

def compose_extrinsic_RT(RT: torch.Tensor):
    """
    Compose the standard form extrinsic matrix from RT.
    Batched I/O.
    """
    return torch.cat([
        RT,
        torch.tensor([[[0, 0, 0, 1]]], dtype=torch.float32).repeat(RT.shape[0], 1, 1).to(RT.device)
        ], dim=1)

def _build_camera_standard(RT: torch.Tensor, intrinsics: torch.Tensor):
    """
    RT: (N, 3, 4)
    intrinsics: (N, 3, 2), [[fx, fy], [cx, cy], [width, height]]
    """
    E = compose_extrinsic_RT(RT)
    fx, fy, cx, cy = get_normalized_camera_intrinsics(intrinsics)
    I = torch.stack([
        torch.stack([fx, torch.zeros_like(fx), cx], dim=-1),
        torch.stack([torch.zeros_like(fy), fy, cy], dim=-1),
        torch.tensor([[0, 0, 1]], dtype=torch.float32, device=RT.device).repeat(RT.shape[0], 1),
    ], dim=1)
    return torch.cat([
        E.reshape(-1, 16),
        I.reshape(-1, 9),
    ], dim=-1)

def _default_render_cameras(batch_size: int = 1):
    M = 80
    radius = 1.5
    elevation = 0
    camera_positions = []
    rand_theta = np.random.uniform(0, np.pi/180)
    elevation = np.radians(elevation)
    for i in range(M):
        theta = 2 * np.pi * i / M + rand_theta
        x = radius * np.cos(theta) * np.cos(elevation)
        y = radius * np.sin(theta) * np.cos(elevation)
        z = radius * np.sin(elevation)
        camera_positions.append([x, y, z])
    camera_positions = torch.tensor(camera_positions, dtype=torch.float32)
    extrinsics = _center_looking_at_camera_pose(camera_positions)

    render_camera_intrinsics = _default_intrinsics().unsqueeze(0).repeat(extrinsics.shape[0], 1, 1)
    render_cameras = _build_camera_standard(extrinsics, render_camera_intrinsics)
    return render_cameras.unsqueeze(0).repeat(batch_size, 1, 1)
    
# @spaces.GPU
def generate_mesh(image, source_size=512, render_size=384, mesh_size=512, export_mesh=False, export_video=True, fps=30):
    image = preprocess_image(image, source_size).to(model_wrapper.device)
    source_camera = _default_source_camera(batch_size=1).to(model_wrapper.device)

    with torch.no_grad():
        planes = model_wrapper.forward(image, source_camera)

        if export_mesh:
            grid_out = model_wrapper.model.synthesizer.forward_grid(planes=planes, grid_size=mesh_size)
            vtx, faces = mcubes.marching_cubes(grid_out['sigma'].float().squeeze(0).squeeze(-1).cpu().numpy(), 1.0)
            vtx = vtx / (mesh_size - 1) * 2 - 1
            vtx_tensor = torch.tensor(vtx, dtype=torch.float32, device=model_wrapper.device).unsqueeze(0)
            vtx_colors = model_wrapper.model.synthesizer.forward_points(planes, vtx_tensor)['rgb'].float().squeeze(0).cpu().numpy()
            vtx_colors = (vtx_colors * 255).astype(np.uint8)
            mesh = trimesh.Trimesh(vertices=vtx, faces=faces, vertex_colors=vtx_colors)

            mesh_path = "awesome_mesh.obj"
            mesh.export(mesh_path, 'obj')

            return mesh_path, mesh_path

        if export_video:
            render_cameras = _default_render_cameras(batch_size=1).to(model_wrapper.device)
            frames = []
            chunk_size = 1
            for i in range(0, render_cameras.shape[1], chunk_size):
                frame_chunk = model_wrapper.model.synthesizer(
                    planes,
                    render_cameras[:, i:i + chunk_size],
                    render_size,
                    render_size,
                    0,
                    0
                )
                frames.append(frame_chunk['images_rgb'])

            frames = torch.cat(frames, dim=1)
            frames = frames.squeeze(0)
            frames = (frames.permute(0, 2, 3, 1).cpu().numpy() * 255).astype(np.uint8)

            video_path = "awesome_video.mp4"
            imageio.mimwrite(video_path, frames, fps=fps)

            return None, video_path

    return None, None

def step_1_generate_obj(image):
    mesh_path, _ = generate_mesh(image, export_mesh=True)
    return mesh_path, mesh_path

def step_2_generate_video(image):
    _, video_path = generate_mesh(image, export_video=True)
    return video_path

def step_3_display_3d_model(mesh_file):
    return mesh_file

def upload_file_to_s3(file_path, bucket_name, object_name):
    try:
        s3_client.upload_file(file_path, bucket_name, object_name)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to upload file to S3: {str(e)}")
    

@app.post("/upload/")
async def upload_image(file: UploadFile = File(...)):
    try:
        # Convert uploaded file to PIL Image
        image = Image.open(io.BytesIO(await file.read()))

        # Generate OBJ file in the temporary directory
        obj_file_path = step_1_generate_obj(image)

        # Generate a unique name for the S3 object
        obj_name = f"object{uuid.uuid4()}.obj"

        # Upload the OBJ file to S3
        s3_url = upload_file_to_s3(obj_file_path, 'framebucket3d', obj_name)

        return JSONResponse(content={"Output": s3_url})

    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Error processing the image: {str(e)}")

# Run FastAPI
if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)