import os
import pickle
import lmdb
from tqdm import tqdm, trange







def read_lmdb(lmdb_path):
    env = lmdb.open(
        lmdb_path,
        subdir=False,
        readonly=True,
        lock=False,
        readahead=False,
        meminit=False,
        max_readers=256,
    )  
    txn = env.begin()
    keys = list(txn.cursor().iternext(values=False))
    out_list = []
    for idx in tqdm(keys):
        datapoint_pickled = txn.get(idx)
        data = pickle.loads(datapoint_pickled)
        out_list.append(data)
        #print(len(data["coordinates"]))
    env.close()
    return out_list 



def write_lmdb(out_list, save_path):
    
    env = lmdb.open(
        save_path,
        subdir=False,
        lock=False,
        readahead=False,
        meminit=False,
        max_readers=64,
        map_size=1099511627776
    )

    with env.begin(write=True) as lmdb_txn:
        for i in tqdm(range(len(out_list))):
            lmdb_txn.put(str(i).encode('ascii'), pickle.dumps(out_list[i]))



if __name__ == "__main__":
    # Example usage
    # Read LMDB
    lmdb_path = "/HOME/nsccgz_ywang/nsccgz_ywang_wzh/HDD_POOL/qiaoaj/DrugCLIP/data/train_no_test_af/train.lmdb"
    data = read_lmdb(lmdb_path)
    print(len(data))
    print(data[0].keys())
    #print(len(data[1]["coordinates"]))

    dic = {
        "atoms": "atom types for each atom in the ligand",
        "coordinates": "3D coordinates for each atom in the ligand generated by RDKit. Max number of conformations is 10",
        "pocket_atoms": "atom types for each atom in the pocket",
        "pocket_coordinates": "3D coordinates for each atom in the pocket",
        "mol": "RDKit molecule object for the ligand",
        "smi": "SMILES string for the ligand",
        "pocket": "pdbid of the pocket",
    }