import arrow
import json
import requests
import re
import logging
import click
from os import makedirs
from random import shuffle
from datetime import datetime, timedelta
from flask import Flask, request, redirect
from flask import render_template, flash, url_for
from urllib.parse import urlparse
from xmrnodes.helpers import determine_crypto, is_onion, make_request
from xmrnodes.forms import SubmitNode
from xmrnodes.models import Node, HealthCheck
from xmrnodes import config


logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(levelname)s - %(message)s"
)

app = Flask(__name__)
app.config.from_envvar("FLASK_SECRETS")
app.secret_key = app.config["SECRET_KEY"]

@app.route("/", methods=["GET", "POST"])
def index():
    form = SubmitNode()
    nettype = request.args.get("nettype", "mainnet")
    crypto = request.args.get("crypto", "monero")
    onion = request.args.get("onion", False)
    nodes = Node.select().where(
        Node.validated==True
    ).where(
        Node.nettype==nettype
    ).where(
        Node.crypto==crypto
    ).order_by(
        Node.datetime_entered.desc()
    )
    if onion:
        nodes = nodes.where(Node.is_tor==True)

    nodes = [n for n in nodes]
    shuffle(nodes)

    return render_template(
        "index.html",
        nodes=nodes,
        nodes_healthy=[n for n in nodes if n.available],
        nodes_unhealthy=[n for n in nodes if not n.available],
        form=form
    )

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

@app.route("/add", methods=["GET", "POST"])
def add():
    if request.method == "POST":
        url = request.form.get("node_url")
        regex = re.compile(
            r"^(?:http)s?://" # http:// or https://
            r"(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|" #domain...
            r"localhost|" #localhost...
            r"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})" # ...or ip
            r"(?::\d+)?" # optional port
            r"(?:/?|[/?]\S+)$", re.IGNORECASE
        )
        re_match = re.match(regex, url)
        if re_match is None:
            flash("This doesn\"t look like a valid URL")
        else:
            _url = urlparse(url)
            url = f"{_url.scheme}://{_url.netloc}".lower()
            if Node.select().where(Node.url == url).exists():
                flash("This node is already in the database.")
            else:
                flash("Seems like a valid node URL. Added to the database and will check soon.")
                node = Node(url=url)
                node.save()
    return redirect("/")

def cleanup_health_checks():
    diff = datetime.now() - timedelta(hours=2)
    checks = HealthCheck.select().where(HealthCheck.datetime <= diff)
    for check in checks:
        print("Deleting check", check.id)
        check.delete_instance()

@app.cli.command("check")
def check():
    cleanup_health_checks()
    nodes = Node.select().where(Node.validated == True)
    for node in nodes:
        now = datetime.utcnow()
        hc = HealthCheck(node=node)
        logging.info(f"Attempting to check {node.url}")
        try:
            r = make_request(node.url)
            assert "status" in r.json()
            assert "offline" in r.json()
            assert "height" in r.json()
            if r.json()["status"] == "OK":
                logging.info("success")
                node.available = True
                node.last_height = r.json()["height"]
                hc.health = True
            else:
                raise
        except:
            logging.info("fail")
            node.datetime_failed = now
            node.available = False
            hc.health = False
        finally:
            node.datetime_checked = now
            node.save()
            hc.save()

@app.cli.command("validate")
def validate():
    nodes = Node.select().where(Node.validated == False)
    for node in nodes:
        now = datetime.utcnow()
        logging.info(f"Attempting to validate {node.url}")
        try:
            r = make_request(node.url)
            assert "height" in r.json()
            assert "nettype" in r.json()
            nettype = r.json()["nettype"]
            crypto = determine_crypto(node.url)
            logging.info("success")
            if nettype in ["mainnet", "stagenet", "testnet"]:
                node.nettype = nettype
                node.available = True
                node.validated = True
                node.last_height = r.json()["height"]
                node.datetime_checked = now
                node.crypto = crypto
                node.is_tor = is_onion(node.url)
                node.save()
            else:
                logging.info("unexpected nettype")
        except requests.exceptions.ConnectTimeout:
            logging.info("connection timed out")
            node.delete_instance()
        except requests.exceptions.SSLError:
            logging.info("invalid certificate")
            node.delete_instance()
        except requests.exceptions.ConnectionError:
            logging.info("connection error")
            node.delete_instance()
        except requests.exceptions.HTTPError:
            logging.info("http error, 4xx or 5xx")
            node.delete_instance()
        except Exception as e:
            logging.info("failed for reasons unknown")
            node.delete_instance()

@app.cli.command("export")
def export():
    all_nodes = []
    export_dir = f"{config.DATA_DIR}/export.txt"
    nodes = Node.select().where(Node.validated == True)
    for node in nodes:
        logging.info(f"Adding {node.url}")
        all_nodes.append(node.url)
    with open(export_dir, "w") as f:
        f.write("\n".join(all_nodes))
    logging.info(f"{nodes.count()} nodes written to {export_dir}")

@app.cli.command("import")
def import_():
    all_nodes = []
    export_dir = f"{config.DATA_DIR}/export.txt"
    with open(export_dir, 'r') as f:
        for url in f.readlines():
            try:
                n = url.rstrip().lower()
                logging.info(f"Adding {n}")
                node = Node(url=n)
                node.save()
                all_nodes.append(n)
            except:
                pass
    logging.info(f"{len(all_nodes)} node urls imported and ready to be validated")

@app.template_filter("humanize")
def humanize(d):
    t = arrow.get(d, "UTC")
    return t.humanize()

if __name__ == "__main__":
    app.run()