import asyncio
import atexit
import datetime
import socket
from functools import lru_cache
from time import sleep, time

import matplotlib.pyplot as plt
import socketio
from apscheduler.schedulers.background import BackgroundScheduler
from flask import Flask, render_template, request
from flask_cors import CORS

sio = socketio.Server()
app = Flask(__name__)
CORS(app)
app.wsgi_app = socketio.WSGIApp(sio, app.wsgi_app)

# We request users to send the run number to prevent accidentially getting old requests from a previous run
# This maybe will give to much errors from people forgetting to change their number
# Remove it?

# TODO
# Save and read from a file to persist over reboots
# Save progress through time during 1 run
# Save result of different runs

db = {"current_run": None, "run_start_timer": None, "run_data": {}}

function_times = []
function_data = []


@app.route("/")
def index():
    return render_template('index.html')


@app.route("/start_run/<run_index>")
def start_run(run_index):
    if not run_index.isdigit():
        return f'{run_index} is not a number'

    db["current_run"] = run_index
    starttime = time()
    if run_index in db["run_data"]:
        return "This run is already ran, take another number."
    db["run_data"][run_index] = {"starttime": starttime, "data": {}}
    # TODO send start request to the first person in the chain. Probably a zeus part already written as example
    sio.emit('start_run', run_index)
    return f'Run {run_index} started at {starttime}'


@app.route("/link/start/<run>/<link_index>")
def link_start(run, link_index):
    if not run.isdigit() or not link_index.isdigit():
        return f'{run} and/or {link_index} is not a number'

    start = time()
    request_data = live_request(run, link_index)
    sio.emit('live_request', request_data)

    if db["current_run"] != run:
        response = "Wrong run number, check that you update your run", 404
    else:
        run_data = db["run_data"][run]["data"]
        if link_index in run_data:
            response = "you already started in this run. Ignoring this request."
        else:
            run_data[link_index] = {"id": link_index, "start": time()}
            sio.emit('link_start', run_data[link_index])
            response = "Success."
    stop = time()
    function_data.append(stop - start)
    function_times.append(len(function_times))
    return response


@app.route("/link/handoff/<run>/<index>")
def link_handoff(run, index):
    if not run.isdigit() or not index.isdigit():
        return f'{run} and/or {index} is not a number'

    if db["current_run"] != run:
        return "Wrong run number, check that you updated you run", 404
    else:
        link_data = db["run_data"][run]["data"][index]
        if "handoff" in link_data:
            return "you already handed off control during this run. Ignoring this request"
        else:
            link_data["handoff"] = time()
            sio.emit('link_handoff', link_data)
            return "Success."


@sio.event
def connect(sid, data):
    if db["current_run"]:
        current_run = db["run_data"][db["current_run"]]
        sio.emit('sync_current_run', current_run, room=sid)


def live_request(run, index):
    ip = request.remote_addr
    request_data = {}
    request_data["hostname"] = lookup_hostname(ip)
    request_data["time"] = time()
    return request_data


@lru_cache()
def lookup_hostname(ip):
    return socket.gethostbyaddr(ip)[0].split(".")[0]


# def plot_graph():
#     try:
#         x = function_times
#         y = function_data

#         plt.plot(x, y)
#         plt.show()
#     except:
#         pass

if __name__ == '__main__':
    # scheduler = BackgroundScheduler()
    # scheduler.add_job(func=plot_graph, trigger="interval", seconds=5)
    # scheduler.start()
    app.run(host="0.0.0.0", debug=True)

    # shut down the scheduler when exiting the app
    # atexit.register(lambda: scheduler.shutdown())