import os

cur_dir = os.path.dirname(os.path.realpath(__file__))

# mkdir jsonl
jsonl_dir = os.path.join(cur_dir, 'jsonl')
if not os.path.exists(jsonl_dir):
    os.makedirs(jsonl_dir)

# list files in jsonl-all directory
jsonl_all_dir = os.path.join(cur_dir, 'jsonl-all')

file_sizes = {}

for file in os.listdir(jsonl_all_dir):
    file_path = os.path.join(jsonl_all_dir, file)
    file_size = os.path.getsize(file_path)
    file_sizes[file] = file_size
    
# sort files by size (keep dictionary)
sorted_files = sorted(file_sizes.items(), key=lambda x: x[1], reverse=True)

def widen_variance(file_sizes, reduction_factor):
    sorted_files = sorted(file_sizes.items(), key=lambda x: x[1], reverse=True)
    print(sorted_files)

    for i, (file, size) in enumerate(sorted_files):
        if i == 0:
            continue
        
        sorted_files[i] = (file, round(size * (reduction_factor / (i/10))))
        
    return sorted_files

# increase the file size distribution
targeted_file_sizes = widen_variance(file_sizes, 0.00005)

print("Sorted files by size:")
for file, size in sorted_files:
    print(f"{file}: {size}")
    
print("Targeted file sizes:")
for file, size in targeted_file_sizes:
    print(f"{file}: {size}")
    
# targeted to dict
targeted_file_sizes = dict(targeted_file_sizes)
    
for file in targeted_file_sizes:
    size = targeted_file_sizes[file]
    file_path = os.path.join(jsonl_all_dir, file)
    file_path_target = os.path.join(jsonl_dir, file)
    
    os.system(f"head -c {size} {file_path} > {file_path_target}")
    print(f"Created {file_path_target} with size {size} bytes")
    
    with open(file_path_target, 'rb+') as file:  # Open the file in read-write binary mode
        file.seek(0, 2)  # Move to the end of the file
        file_size = file.tell()  # Get the total file size
        for i in range(file_size - 1, -1, -1):  # Start from the last byte and move backwards
            file.seek(i)  # Move the cursor to the ith position from the start
            if file.read(1) == b'\n':  # If a newline character is found
                file.truncate(i + 1)  # Truncate the file from this point
                break  # Exit the loop after truncating
        
        
print("Done!")