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import os 
import json
import shutil
from pathlib import Path
from typing import Dict

from PIL import ImageFile
ImageFile.LOAD_TRUNCATED_IMAGES = True

LOCAL_DATADIR = None

def setup(local_dir='./data/usm-training-data/data'):
    
    # If we are in the test environment, we need to link the data directory to the correct location
    tmp_datadir = Path('/tmp/data/data')
    local_test_datadir = Path('./data/usm-test-data-x/data')
    local_val_datadir = Path(local_dir)
    
    os.system('pwd')
    os.system('ls -lahtr .')
    
    if tmp_datadir.exists() and not local_test_datadir.exists():
        global LOCAL_DATADIR
        LOCAL_DATADIR = local_test_datadir
        # shutil.move(datadir, './usm-test-data-x/data')
        print(f"Linking {tmp_datadir} to {LOCAL_DATADIR} (we are in the test environment)")
        LOCAL_DATADIR.parent.mkdir(parents=True, exist_ok=True)
        LOCAL_DATADIR.symlink_to(tmp_datadir)
    else:
        LOCAL_DATADIR = local_val_datadir
        print(f"Using {LOCAL_DATADIR} as the data directory (we are running locally)")
        
    # os.system("ls -lahtr")
    # os.system(f"ls -lahtr {LOCAL_DATADIR}")
    
    assert LOCAL_DATADIR.exists(), f"Data directory {LOCAL_DATADIR} does not exist"
    return LOCAL_DATADIR
    
    
    
    
import importlib
from pathlib import Path
import subprocess

def download_package(package_name, path_to_save='packages'):
    """
    Downloads a package using pip and saves it to a specified directory.

    Parameters:
    package_name (str): The name of the package to download.
    path_to_save (str): The path to the directory where the package will be saved.
    """
    try:
        # pip download webdataset -d packages/webdataset --platform manylinux1_x86_64 --python-version 38 --only-binary=:all:
        subprocess.check_call([subprocess.sys.executable, "-m", "pip", "download", package_name, 
                               "-d", str(Path(path_to_save)/package_name),  # Download the package to the specified directory
                               "--platform", "manylinux1_x86_64",  # Specify the platform
                               "--python-version", "38",  # Specify the Python version
                               "--only-binary=:all:"])  # Download only binary packages
        print(f'Package "{package_name}" downloaded successfully')
    except subprocess.CalledProcessError as e:
        print(f'Failed to downloaded package "{package_name}". Error: {e}')
              
              
def install_package_from_local_file(package_name, folder='packages'):
    """
    Installs a package from a local .whl file or a directory containing .whl files using pip.

    Parameters:
    path_to_file_or_directory (str): The path to the .whl file or the directory containing .whl files.
    """
    try:
        pth = str(Path(folder) / package_name)
        subprocess.check_call([subprocess.sys.executable, "-m", "pip", "install", 
                               "--no-index",  # Do not use package index
                               "--find-links", pth,  # Look for packages in the specified directory or at the file
                               package_name])  # Specify the package to install
        print(f"Package installed successfully from {pth}")
    except subprocess.CalledProcessError as e:
        print(f"Failed to install package from {pth}. Error: {e}")
        
        
def importt(module_name, as_name=None):
    """
    Imports a module and returns it.

    Parameters:
    module_name (str): The name of the module to import.
    as_name (str): The name to use for the imported module. If None, the original module name will be used.

    Returns:
    The imported module.
    """
    for _ in range(2):
        try:
            if as_name is None:
                print(f'imported {module_name}')
                return importlib.import_module(module_name)
            else:
                print(f'imported {module_name} as {as_name}')
                return importlib.import_module(module_name, as_name)
        except ModuleNotFoundError as e:
            install_package_from_local_file(module_name)
            print(f"Failed to import module {module_name}. Error: {e}")
            
    
def prepare_submission():
    # Download packages from requirements.txt 
    if Path('requirements.txt').exists():
        print('downloading packages from requirements.txt')
        Path('packages').mkdir(exist_ok=True)
        with open('requirements.txt') as f:
            packages = f.readlines()
            for p in packages:
                download_package(p.strip())
                
    print('all packages downloaded. Don\'t foget to include the packages in the submission by adding them with git lfs.')
        

def Rt_to_eye_target(im, K, R, t):
    height = im.height
    focal_length = K[0,0]
    fov = 2.0 * np.arctan2((0.5 * height), focal_length) / (np.pi / 180.0)

    x_axis, y_axis, z_axis = R

    eye = -(R.T @ t).squeeze()
    z_axis = z_axis.squeeze()
    target = eye + z_axis
    up = -y_axis
    
    return eye, target, up, fov        


########## general utilities ##########
import contextlib
import tempfile 
from pathlib import Path

@contextlib.contextmanager
def working_directory(path):
    """Changes working directory and returns to previous on exit."""
    prev_cwd = Path.cwd()
    os.chdir(path)
    try:
        yield
    finally:
        os.chdir(prev_cwd)
        
@contextlib.contextmanager
def temp_working_directory():
    with tempfile.TemporaryDirectory(dir='.') as D:
        with working_directory(D):
            yield


############# Dataset ############# 
def proc(row, split='train'):
    out = {}
    for k, v in row.items():
        colname = k.split('.')[0]
        if colname in {'ade20k', 'depthcm', 'gestalt'}:
            if colname in out:
                out[colname].append(v)
            else:
                out[colname] = [v]
        elif colname in {'wireframe', 'mesh'}:
            # out.update({a: b.tolist() for a,b in v.items()})
            out.update({a: b for a,b in v.items()})
        elif colname in 'kr':
            out[colname.upper()] = v
        else:
            out[colname] = v
            
    return Sample(out)





from . import read_write_colmap
def decode_colmap(s):
    # with open('colmap_solve/points3D.bin', 'wb') as stream:
    
    with temp_working_directory():

        with open('points3D.bin', 'wb') as stream:
            stream.write(s['points3d'])


        with open('cameras.bin', 'wb') as stream:
            stream.write(s['cameras'])


        with open('images.bin', 'wb') as stream:
            stream.write(s['images'])
    
        
        cameras, images, points3D = read_write_colmap.read_model(
            path='.', ext='.bin'
        )
    return cameras, images, points3D

from PIL import Image
import io
def decode(row):
    cameras, images, points3D = decode_colmap(row)
    
    out = {}
    
    for k, v in row.items():
        # colname = k.split('.')[0]
        if k in {'ade20k', 'depthcm', 'gestalt'}:
            # print(k, len(v), type(v))
            v = [Image.open(io.BytesIO(im)) for im in v]
            if k in out:
                out[k].extend(v)
            else:
                out[k] = v
        elif k in {'wireframe', 'mesh'}:
            # out.update({a: b.tolist() for a,b in v.items()})
            v = dict(np.load(io.BytesIO(v)))
            out.update({a: b for a,b in v.items()})
        elif k in 'kr':
            out[k.upper()] = v
        elif k == 'cameras':
            out[k] = cameras
        elif k == 'images':
            out[k] = images
        elif k =='points3d':
            out[k] = points3D
        else:
            out[k] = v
            
    return Sample(out)


class Sample(Dict):
    def __repr__(self):
        return str({k: v.shape if hasattr(v, 'shape') else [type(v[0])] if isinstance(v, list) else type(v) for k,v in self.items()})

    
        
def get_params():
    exmaple_param_dict = {
        "competition_id": "usm3d/S23DR",
        "competition_type": "script",
        "metric": "custom",
        "token": "hf_**********************************",
        "team_id": "local-test-team_id",
        "submission_id": "local-test-submission_id",
        "submission_id_col": "__key__",
        "submission_cols": [
            "__key__",
            "wf_edges",
            "wf_vertices",
            "edge_semantics"
        ],
        "submission_rows": 180,
        "output_path": ".",
        "submission_repo": "<THE HF MODEL ID of THIS REPO",
        "time_limit": 7200,
        "dataset": "usm3d/usm-test-data-x",
        "submission_filenames": [
            "submission.parquet"
        ]
    }
    
    param_path = Path('params.json')
    
    if not param_path.exists():
        print('params.json not found (this means we probably aren\'t in the test env). Using example params.')
        params = exmaple_param_dict
    else:
        print('found params.json (this means we are probably in the test env). Using params from file.')
        with param_path.open() as f:
            params = json.load(f)
    print(params)
    return params



import webdataset as wds 
import numpy as np

def get_dataset(decode='pil', proc=proc, split='train', dataset_type='webdataset'):
    if LOCAL_DATADIR is None:
        raise ValueError('LOCAL_DATADIR is not set. Please run setup() first.')
        
    local_dir = Path(LOCAL_DATADIR)
    if split != 'all':
        local_dir = local_dir / split
    
    paths = [str(p) for p in local_dir.rglob('*.tar.gz')]
    
    dataset = wds.WebDataset(paths)
    if decode is not None:
        dataset = dataset.decode(decode)
    else:
        dataset = dataset.decode()
    
    dataset = dataset.map(proc)
    
    if dataset_type == 'webdataset':
        return dataset
    
    if dataset_type == 'hf':
        import datasets
        from datasets import Features, Value, Sequence, Image, Array2D
       
        if split == 'train':
            return datasets.IterableDataset.from_generator(lambda: dataset.iterator())
        elif split == 'val':
            return datasets.IterableDataset.from_generator(lambda: dataset.iterator())