import json
import os

def read_and_process_dataset(file_path, num_shards, output_dir):
    try:
        with open(file_path, 'r') as file:
            shard_size = sum(1 for line in file) // num_shards
            file.seek(0)  # Reset file pointer to the beginning

            current_shard = 0
            current_line = 0
            shard = []

            for line in file:
                if current_line < shard_size * (current_shard + 1):
                    shard.append(json.loads(line))
                else:
                    write_shard(shard, current_shard, output_dir)
                    shard = [json.loads(line)]
                    current_shard += 1
                current_line += 1

            # Write the last shard
            if shard:
                write_shard(shard, current_shard, output_dir)

        print(f"Dataset processed and sharded successfully into {num_shards} parts.")
    except Exception as e:
        print(f"Error processing dataset from {file_path}: {e}")

def write_shard(shard, shard_index, output_dir):
    if not os.path.exists(output_dir):
        os.makedirs(output_dir)

    shard_file = os.path.join(output_dir, f'shard_{shard_index+1}.jsonl')
    with open(shard_file, 'w') as file:
        for item in shard:
            json.dump(item, file)
            file.write('\n')
    print(f"Shard {shard_index+1} written to {shard_file}.")

def main():
    input_file = r"C:\Users\MeMyself\reddit_question_best_answers\processed\synthesized_dataset.jsonl"  # Update with your processed dataset file path
    output_dir = r"C:\Users\MeMyself\reddit_question_best_answers\processed"  # Update with your output directory for shards
    num_shards = 33

    read_and_process_dataset(input_file, num_shards, output_dir)

if __name__ == "__main__":
    main()