import requests
import time
import json
import os
import base64
import sys
import urllib.parse
import requests
import argparse

def send_waku_msg(node_address, kbytes, pubsub_topic, content_topic):
    # TODO dirty trick .replace("=", "")
    base64_payload = (base64.b64encode(os.urandom(kbytes*1000)).decode('ascii')).replace("=", "")
    print("size message kBytes", len(base64_payload) *(3/4)/1000, "KBytes")
    body = {
        "payload": base64_payload,
        "contentTopic": content_topic,
        "version": 1,  # You can adjust the version as needed
        #"timestamp": int(time.time())
    }

    encoded_pubsub_topic = urllib.parse.quote(pubsub_topic, safe='')

    url = f"{node_address}/relay/v1/messages/{encoded_pubsub_topic}"
    headers = {'content-type': 'application/json'}

    print('Waku REST API: %s PubSubTopic: %s, ContentTopic: %s' % (url, pubsub_topic, content_topic))
    s_time = time.time()
    
    response = None

    try:
      print("Sending request")
      response = requests.post(url, json=body, headers=headers)
    except Exception as e:
      print(f"Error sending request: {e}")

    if(response != None):
      elapsed_ms = (time.time() - s_time) * 1000
      print('Response from %s: status:%s content:%s [%.4f ms.]' % (node_address, \
        response.status_code, response.text, elapsed_ms))

parser = argparse.ArgumentParser(description='')

# these flags are mutually exclusive, one or the other, never at once
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('-sn', '--single-node', type=str, help='example: http://waku-simulator_nwaku_1:8645')
group.add_argument('-mn', '--multiple-nodes', type=str, help='example: http://waku-simulator_nwaku_[1..10]:8645')

# rest of araguments
parser.add_argument('-c', '--content-topic', type=str, help='content topic', default="my-ctopic")
parser.add_argument('-p', '--pubsub-topic', type=str, help='pubsub topic', default="/waku/2/default-waku/proto")
parser.add_argument('-s', '--msg-size-kbytes', type=int, help='message size in kBytes', default=10)
parser.add_argument('-d', '--delay-seconds', type=int, help='delay in second between messages', required=15)
args = parser.parse_args()

print(args)

if args.single_node != None:
  print("Injecting traffic to single node REST API:", args.single_node)

# this simply converts from http://url_[1..5]:port to
# [http://url_1:port
nodes = []
if args.multiple_nodes:
  range_nodes = args.multiple_nodes.split(":")[1].split("_")[2]
  node_placeholder = args.multiple_nodes.replace(range_nodes, "{placeholder}")
  clean_range = range_nodes.replace("[", "").replace("]", "")
  start = int(clean_range.split("..")[0])
  end = int(clean_range.split("..")[1])

  print("Injecting traffic to multiple nodes REST APIs") 
  for i in range(start, end+1):
    nodes.append(node_placeholder.replace("{placeholder}", str(i)))

for node in nodes:
  print(node)

while True:
    # calls are blocking
    # limited by the time it takes the REST API to reply

    if args.single_node != None:
      send_waku_msg(args.single_node, args.msg_size_kbytes, args.pubsub_topic, args.content_topic)

    if args.multiple_nodes != None:
      for node in nodes:
        send_waku_msg(node, args.msg_size_kbytes, args.pubsub_topic, args.content_topic)

    print("sleeping: ", args.delay_seconds, " seconds")
    time.sleep(args.delay_seconds)