import argparse
from pathlib import Path
import json
import re
import gc
from safetensors.torch import load_file, save_file
import torch


SDXL_KEYS_FILE = "sdxl_keys.txt"


def list_uniq(l):
    return sorted(set(l), key=l.index)


def read_safetensors_metadata(path: str):
    with open(path, 'rb') as f:
        header_size = int.from_bytes(f.read(8), 'little')
        header_json = f.read(header_size).decode('utf-8')
        header = json.loads(header_json)
        metadata = header.get('__metadata__', {})
        return metadata


def keys_from_file(path: str):
    keys = []
    try:
        with open(str(Path(path)), encoding='utf-8', mode='r') as f:
            lines = f.readlines()
        for line in lines:
            keys.append(line.strip())
    except Exception as e:
        print(e)
    finally:
        return keys


def validate_keys(keys: list[str], rfile: str=SDXL_KEYS_FILE):
    missing = []
    added = []
    try:
        rkeys = keys_from_file(rfile)
        all_keys = list_uniq(keys + rkeys)
        for key in all_keys:
            if key in set(rkeys) and key not in set(keys): missing.append(key)
            if key in set(keys) and key not in set(rkeys): added.append(key)
    except Exception as e:
        print(e)
    finally:
        return missing, added


def read_safetensors_key(path: str):
    try:
        keys = []
        state_dict = load_file(str(Path(path)))
        for k, v in state_dict.items():
            keys.append(k)
    except Exception as e:
        print(e)
    finally:
        del state_dict
        torch.cuda.empty_cache()
        gc.collect()
        return keys


def write_safetensors_key(keys: list[str], path: str, is_validate: bool=True, rpath: str=SDXL_KEYS_FILE):
    if len(keys) == 0: return False
    try:
        with open(str(Path(path)), encoding='utf-8', mode='w') as f:
            f.write("\n".join(keys))
        if is_validate:
            missing, added = validate_keys(keys, rpath)
            with open(str(Path(path).stem + "_missing.txt"), encoding='utf-8', mode='w') as f:
                f.write("\n".join(missing))
            with open(str(Path(path).stem + "_added.txt"), encoding='utf-8', mode='w') as f:
                f.write("\n".join(added))
        return True
    except Exception as e:
        print(e)
        return False


def stkey(input: str, out_filename: str="", is_validate: bool=True, rfile: str=SDXL_KEYS_FILE):
    keys = read_safetensors_key(input)
    if len(keys) != 0 and out_filename: write_safetensors_key(keys, out_filename, is_validate, rfile)
    if len(keys) != 0:
        print("Metadata:")
        print(read_safetensors_metadata(input))
        print("\nKeys:")
        print("\n".join(keys))
        if is_validate:
            missing, added = validate_keys(keys, rfile)
            print("\nMissing Keys:")
            print("\n".join(missing))
            print("\nAdded Keys:")
            print("\n".join(added))


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("input", type=str, help="Input safetensors file.")
    parser.add_argument("-s", "--save", action="store_true", default=False, help="Output to text file.")
    parser.add_argument("-o", "--output", default="", type=str, help="Output to specific text file.")
    parser.add_argument("-v", "--val", action="store_false", default=True, help="Disable key validation.")
    parser.add_argument("-r", "--rfile", default=SDXL_KEYS_FILE, type=str, help="Specify reference file to validate keys.")

    args = parser.parse_args()

    if args.save: out_filename = Path(args.input).stem + ".txt"
    out_filename = args.output if args.output else out_filename

    stkey(args.input, out_filename, args.val, args.rfile)


# Usage:
# python stkey.py sd_xl_base_1.0_0.9vae.safetensors
# python stkey.py sd_xl_base_1.0_0.9vae.safetensors -s
# python stkey.py sd_xl_base_1.0_0.9vae.safetensors -o key.txt