import requests
import docker
import concurrent.futures
import time
import os
from math import floor
from init import init
from common import FRAMEWORKS, ENDPOINTS, API_REQUESTS, AVG_RUNS

init()

THREADS = 10
FRAMEWORK_NAME = ""
CONTAINER_NAME = ""
URL_BASE = 'http://localhost:9090'

def send_request(url, method = 'GET', data = None):
    success = False
    responses = {
        2: 0, # OK
        4: 0, # Bad Request
        5: 0, # Server Error
    }
    while not success:
        try:
            response = None
            if method == 'GET':
                response = requests.get(url)
            elif method == 'POST':
                payload = data[0]
                content_type = data[1]
                response = requests.post(url, data=payload, headers={'Content-Type': content_type})
        except:
            continue
        success = response.status_code == 200
        responses[floor(response.status_code/100)] += 1
    return responses

def getFileNames(endpoint):
    endpoint = endpoint.replace('/', '')

    files = [
        f"data/req_{FRAMEWORK_NAME}_{endpoint}.csv",
        f"data/resource_{FRAMEWORK_NAME}_{endpoint}.csv",
    ]

    return files

def record(filename, requests, reqpersec):
    with open(filename, "a") as file:
        file.write(f"{requests},{reqpersec}\n")

def record_resource(filename, requests, cpu, ram):
    with open(filename, "a") as file:
        file.write(f"{requests},{cpu},{ram}\n")

def run_tests(endpoint, method, num_requests, metadata):
    files = getFileNames(endpoint)
    for filename in files:
        if os.path.exists(filename):
            os.remove(filename)

    for num_request in num_requests:
        if num_request <= 0: continue

        for run in range(AVG_RUNS):
            ok_responses = 0
            bad_responses = 0
            server_errors = 0

            cpu, ram = 0, 0

            with concurrent.futures.ThreadPoolExecutor(max_workers=THREADS) as executor:
                url = f'{URL_BASE}{endpoint}'

                start_time = time.time()

                futures = []
                #with requests.Session() as session:
                #    futures = [executor.submit(send_request, session, url) for _ in range(num_request)]

                half = floor(num_request/2)
                for i in range(num_request):
                    futures.append(executor.submit(send_request, url, method, metadata))

                    if i == half:
                        cpu, ram = get_resource_usage()

                concurrent.futures.wait(futures)

                elapsed_time = time.time() - start_time

                for future in futures:
                    responses = future.result()
                    ok_responses += responses[2]
                    bad_responses += responses[4]
                    server_errors += responses[5]

            print(f"[#{run}] {num_request}: {elapsed_time:.2f} seconds. {elapsed_time/num_request:.4f} seconds per request. {num_request/elapsed_time:.2f} requests per second. [OK: {ok_responses}, Bad Request: {bad_responses}, Server Error: {server_errors}]]")

            client = docker.from_env()
            client.containers.get(CONTAINER_NAME).restart()

            record(files[0], num_request, f"{num_request/elapsed_time:.2f}")
            record_resource(files[1], num_request, cpu, ram)

            time.sleep(3)

def get_resource_usage():
    if CONTAINER_NAME == "": return 0, 0

    try:
        client = docker.from_env()
        stats = client.containers.get(CONTAINER_NAME).stats(stream=False)
    except:
        return 0, 0 # unable to get stats

    return get_cpu_usage(stats), get_ram_usage(stats)

def get_cpu_usage(stats):
    UsageDelta = stats['cpu_stats']['cpu_usage']['total_usage'] - stats['precpu_stats']['cpu_usage']['total_usage']
    SystemDelta = stats['cpu_stats']['system_cpu_usage'] - stats['precpu_stats']['system_cpu_usage']
    len_cpu = stats['cpu_stats']['online_cpus']
    percentage = (UsageDelta / SystemDelta) * len_cpu
    return f"{percentage:.2f}"

def get_ram_usage(stats):
    usage = stats['memory_stats']['usage']
    limit = stats['memory_stats']['limit']

    percentage = (usage / limit)

    # percent = round(percentage, 2)
    return f"{percentage:.2f}"

if __name__ == "__main__":
    if not os.path.exists("data"):
        os.mkdir("data")

    init()

    for i in range(len(FRAMEWORKS)):
        FRAMEWORK_NAME = FRAMEWORKS[i][0]
        CONTAINER_NAME = FRAMEWORKS[i][1]
        URL_BASE = ENDPOINTS[FRAMEWORK_NAME]

        for endpoint, method, num_requests, metadata in API_REQUESTS:
            print(f"# {FRAMEWORK_NAME} - {endpoint}")
            run_tests(endpoint, method, num_requests, metadata)