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import sys
import threading
import csv
import json

# define the function you want to execute
def change_receipt(receipt_id, vat, link, config):
    new_vat = vat * config['vat_multiplier']
    new_link = config['base_url'] + link
    return [receipt_id, new_vat, new_link]

# get the filename, thread count, and config filename arguments from the command line
args = sys.argv[1:]
options = {}
for i in range(0, len(args), 2):
    options[args[i].replace('--', '')] = args[i+1]

filename = options.get('filename')
thread_count = int(options.get('thread-count'))
config_filename = options.get('config')

# load the config file
with open(config_filename) as config_file:
    config = json.load(config_file)

# create a semaphore to limit the number of threads
semaphore = threading.Semaphore(thread_count)

# define a worker function that executes the target function with the given arguments
def worker(target, args):
    target(*args)
    semaphore.release()

# define a function that reads the input file and starts a thread for each line
def process_file(filename):
    results = []
    with open(filename, newline='') as csvfile:
        reader = csv.reader(csvfile, delimiter=',', quotechar='"')
        for row in reader:
            if len(row) >= 3:
                receipt_id, vat, link = row[:3]
                args = (receipt_id, float(vat), link, config)
                semaphore.acquire()
                thread = threading.Thread(target=worker, args=(change_receipt, args))
                thread.start()

# start a thread for each input file
threads = []
with open(filename, newline='') as csvfile:
    reader = csv.reader(csvfile, delimiter=',', quotechar='"')
    for row in reader:
        if len(row) >= 3:
            receipt_id, vat, link = row[:3]
            args = (receipt_id, float(vat), link, config)
            thread = threading.Thread(target=worker, args=(change_receipt, args))
            thread.start()
            threads.append(thread)

# wait for all threads to finish
for thread in threads:
    thread.join()

# write the results back to the original file
results = [thread.result() for thread in threads]
with open(filename, 'w', newline='') as csvfile:
    writer = csv.writer(csvfile, delimiter=',', quotechar='"', quoting=csv.QUOTE_MINIMAL)
    writer.writerow(['receipt_id', 'vat', 'link'])
    for result in results:
        writer.writerow(result)