import os, ast, hashlib
from pathlib import Path
import json

ASSETS_PATH = Path(__file__).parent
ASSETS_PATH_ABS = Path(__file__).parent.resolve()


def extract_item_dict(file_path):
    try:
        with open(file_path, "r", encoding="utf-8") as f:
            content = f.read()

        tree = ast.parse(content)

        if len(tree.body) == 1 and isinstance(tree.body[0], ast.Expr) and isinstance(tree.body[0].value, ast.Dict):
            return ast.literal_eval(tree.body[0].value)

        return None

    except Exception as e:
        print(f"Error processing {file_path}: {e}")
        return None


def collect_all_items(item_file_list, base_path="."):
    """Collect ITEM dicts from all item.py files"""

    combined_dict = {}
    num = 0
    visualization_path = ASSETS_PATH / "extra" / "visualization"
    has_visualization = visualization_path.exists()
    for item_path in item_file_list:
        # Assuming item_path is a file path like "objects/carton/benchmark_carton_003/item.py"
        file_path = Path(base_path) / item_path
        usda_path = (Path(item_path).parent / "Aligned.usda").relative_to(ASSETS_PATH).as_posix()
        desc_path = (Path(base_path) / item_path).parent / "description.py"

        # Use the directory name as key, or customize as needed
        key = file_path.parent.name
        interaction_path = ASSETS_PATH / "interaction" / key / "interaction.json"
        # visualization paths (similar to interaction)
        visualization_video_path = visualization_path / key / "video" / "merged.mp4"
        visualization_snapshot_dir_path = visualization_path / key / "snapshot"
        if file_path.exists():
            item_dict = extract_item_dict(file_path)
            if item_dict:
                if key in combined_dict:
                    print("ERROR!!! Duplicated object detected!", file_path)
                    print("                                    ", usda_path)
                combined_dict[key] = item_dict
                combined_dict[key]["url"] = str(usda_path)
                if desc_path.exists():
                    desc_dict = extract_item_dict(desc_path)
                    if desc_dict:
                        combined_dict[key]["description"] = desc_dict
                else:
                    combined_dict[key]["description"] = {}
                    print("WARN !!! Empty LLM description!", file_path)
                # video path - from visualization folder
                if visualization_video_path.exists():
                    combined_dict[key]["video"] = str(visualization_video_path)
                else:
                    combined_dict[key]["video"] = ""
                    if has_visualization:
                        print("WARN !!! Empty video!", visualization_video_path)
                # snapshot dir path - from visualization folder
                if visualization_snapshot_dir_path.exists():
                    snapshot_files = list(visualization_snapshot_dir_path.glob("*"))
                    combined_dict[key]["snapshot"] = snapshot_files
                else:
                    combined_dict[key]["snapshot"] = []
                if len(combined_dict[key]["snapshot"]) == 0:
                    if has_visualization:
                        print("WARN !!! Empty snapshot!", visualization_snapshot_dir_path)
                # interaction
                if interaction_path.exists():
                    try:
                        interaction_dict = json.load(open(interaction_path))
                        combined_dict[key]["interaction"] = interaction_dict["interaction"]
                    except Exception as e:
                        # print(f"Error loading interaction.json: {e}")
                        combined_dict[key]["interaction"] = {}
                else:
                    combined_dict[key]["interaction"] = {}
                    # print("WARN !!! Empty interaction.json!", interaction_path)
            else:
                print(f"No ITEM dict found in {file_path}")
        else:
            print(f"File not found: {file_path}")

        num += 1

    if num != len(combined_dict):
        error = f"ERROR! there're items using the same name!!! {num} != {len(combined_dict)}"
        print(error)
        # raise Exception(error)

    return combined_dict


def find_all_items():
    base = Path(__file__).parent / "objects"
    for root, dirs, files in os.walk(base, followlinks=True):
        if "object_parameters.json" in files:
            yield Path(root) / "item.py"


########

print(f"Initializing GenieSim Asset Lib at", Path(__file__).parent)

# Collect all ITEM dicts
ASSETS_INDEX = collect_all_items(find_all_items())
ASSETS_PAYLOAD = "".join(f"{k}={v}\n" for k, v in sorted(ASSETS_INDEX.items())).encode("utf-8")
ASSETS_INDEX_HASH = hashlib.sha256(ASSETS_PAYLOAD).hexdigest()


print(f"Initialized GenieSim Asset Lib, Found {len(ASSETS_INDEX)} items, hash: {ASSETS_INDEX_HASH}")