#!/bin/false
# Don't run directly, use gunicorn

from flask import Flask, request, render_template
from flask_socketio import SocketIO, emit, send
import subprocess
import json
from datetime import datetime
from collections import defaultdict
from urllib.parse import urlencode
import urllib.request
import base64
import requests
import socket

app = Flask(__name__)
# This is fine
socketio = SocketIO(app, cors_allowed_origins='*')
messages = []

timeout = 1

class Message:
    def __init__(self, time, sender, sendertype, msg, sid = None):
        self.time = time
        self.sid = sid
        self.sender = sender
        self.sendertype = sendertype
        self.msg = msg

def send_message(message) -> tuple:

    if not message.msg:
        return (False,"No message found")

    if len(message.msg) > 200:
        return (False,"Message too long, maximum 200")

    messages.append(message)

    # Send message to MessageOS
    msg_with_sendr: str = "<{}> {}".format(message.sender, message.msg) if message.sender != "somebody" else message.msg
    msg_b64 = base64.b64encode(msg_with_sendr.encode())

    url = "http://10.0.5.42:8000/" # Set destination URL here
    post_fields = {"X-Messages": msg_b64}
    assembly_request = urllib.request.Request(url, urlencode(post_fields).encode())
    assembly_request.add_header("X-Messages", msg_b64)
    urllib.request.urlopen(assembly_request).read().decode()
    try:
        requests.put("http://10.0.0.10/api/mailbox.json", json={"topic": "morsemessage", "message": msg_with_sendr})
    except:
        pass

    return (True,"OK")

def reverse_lookup(ip):
    rdns = socket.getnameinfo((ip, 0), 0)
    if rdns:
        ip = rdns[0]
    return ip


@app.route("/messages/")
def messages_get():
    return render_template("chat.html", messages=messages[::-1])

@app.route("/reply/", methods = ["POST"])
def reply_post():
    if request.data:

        message = request.data.decode()

        if len(message) > 200:
            return "Message too long, maximum 200"

        if not message:
            return "No message found"
        if len(messages) > 0 and messages[-1].sid:
            socketio.emit('replymessage', {'message': message},to=messages[-1].sid)
            return "Message sent\n"
        else:
            return "Could not reply"
    return "Failed\n"

@socketio.on('message')
def message_socket(data):
    if data.get("username"):
        sender = data.get("username")
        sendertype = "name"
    elif "X-Real-IP" in request.headers:
        sender = reverse_lookup(request.headers["X-Real-IP"])
        sendertype = "ip"
    else:
        sender = "somebody"
        sendertype = "unknown"

    ok, return_message = send_message(Message(datetime.now(), sender, sendertype, data.get("message"), sid = request.sid))

    return return_message

@app.route("/messages/", methods = ["POST"])
def messages_post():
    if request.data:
        if "X-Username" in request.headers and len(request.headers["X-Username"]) > 0:
            sender = request.headers["X-Username"]
            sendertype = "name"
        elif "X-Real-IP" in request.headers:
            sender = reverse_lookup(request.headers["X-Real-IP"])
            sendertype = "ip"
        else:
            sender = "-"
            sendertype = "unknown"

        message = request.data.decode()
        if not message:
            return "No message found"

        headers = {
            'X-Username': sender,
        }
        data = {
            'message': message
        }

        try:
            response = requests.post("http://10.0.0.171:8080/message", headers=headers, json=data)
            response.raise_for_status()
        except:
            pass

        msg_with_sendr: str = "<{}> {}".format(sender, message) if sender != "somebody" else message
        try:
            requests.put("http://10.0.0.10/api/mailbox.json", json={"topic": "morsemessage", "message": msg_with_sendr})
        except:
            pass

        messages.append(Message(datetime.now(), sender, sendertype, message))

        return ""
    else:
        return ""

# make sure only messages from the last hour are sent
# this command also only sends messages the user doesn't have yet.
@app.route('/<last_index>/api.json')
def api(last_index):
    curr_time = datetime.now()
    ci = len(messages)-1
    while curr_time - messages[ci].time < datetime.timedelta(hours = 1) and ci > last_index:
        ci -= 1
    return jsonify({"newest_msg_index": len(messages) , "messages": messages[ci:]})


if __name__ == "__main__":
    socketio.run(app,port=3000,host='0.0.0.0')