#! /usr/bin/env python
from __future__ import absolute_import, print_function

import base64
import pprint
import random
import sqlite3
import sys
import time
import threading
import json
from decimal import InvalidOperation, Decimal

from jmdaemon.protocol import JM_VERSION
from jmbase.support import get_log, joinmarket_alert, DUST_THRESHOLD
from jmdaemon.irc import B_PER_SEC
log = get_log()


class JMTakerError(Exception):
    pass


class OrderbookWatch(object):

    def set_msgchan(self, msgchan):
        self.msgchan = msgchan
        self.msgchan.register_orderbookwatch_callbacks(self.on_order_seen,
                                                       self.on_order_cancel)
        self.msgchan.register_channel_callbacks(
            self.on_welcome, self.on_set_topic, None, self.on_disconnect,
            self.on_nick_leave, None)

        self.dblock = threading.Lock()
        con = sqlite3.connect(":memory:", check_same_thread=False)
        con.row_factory = sqlite3.Row
        self.db = con.cursor()
        self.db.execute("CREATE TABLE orderbook(counterparty TEXT, "
                        "oid INTEGER, ordertype TEXT, minsize INTEGER, "
                        "maxsize INTEGER, txfee INTEGER, cjfee TEXT);")

    @staticmethod
    def on_set_topic(newtopic):
        chunks = newtopic.split('|')
        for msg in chunks[1:]:
            try:
                msg = msg.strip()
                params = msg.split(' ')
                min_version = int(params[0])
                max_version = int(params[1])
                alert = msg[msg.index(params[1]) + len(params[1]):].strip()
            except ValueError, IndexError:
                continue
            if min_version < JM_VERSION < max_version:
                print('=' * 60)
                print('JOINMARKET ALERT')
                print(alert)
                print('=' * 60)
                joinmarket_alert[0] = alert

    def on_order_seen(self, counterparty, oid, ordertype, minsize, maxsize,
                      txfee, cjfee):
        try:
            self.dblock.acquire(True)
            if int(oid) < 0 or int(oid) > sys.maxint:
                log.debug("Got invalid order ID: " + oid + " from " +
                          counterparty)
                return (False, [])
            # delete orders eagerly, so in case a buggy maker sends an
            # invalid offer, we won't accidentally !fill based on the ghost
            # of its previous message.
            self.db.execute(
                ("DELETE FROM orderbook WHERE counterparty=? "
                 "AND oid=?;"), (counterparty, oid))
            # now validate the remaining fields
            if int(minsize) < 0 or int(minsize) > 21 * 10**14:
                log.debug("Got invalid minsize: {} from {}".format(
                    minsize, counterparty))
                return (False, [])
            if int(minsize) < DUST_THRESHOLD:
                minsize = DUST_THRESHOLD
                log.debug("{} has dusty minsize, capping at {}".format(
                    counterparty, minsize))
                # do not pass return, go not drop this otherwise fine offer
            if int(maxsize) < 0 or int(maxsize) > 21 * 10**14:
                log.debug("Got invalid maxsize: " + maxsize + " from " +
                          counterparty)
                return (False, [])
            if int(txfee) < 0:
                log.debug("Got invalid txfee: {} from {}".format(txfee,
                                                                 counterparty))
                return (False, [])
            if int(minsize) > int(maxsize):

                fmt = ("Got minsize bigger than maxsize: {} - {} "
                       "from {}").format
                log.debug(fmt(minsize, maxsize, counterparty))
                return (False, [])
            if ordertype == 'absoffer' and not isinstance(cjfee, int):
                try:
                    cjfee = int(cjfee)
                except ValueError:
                    log.debug("Got non integer coinjoin fee: " + str(cjfee) +
                              " for an absoffer from " + counterparty)
                    return (False, [])
            self.db.execute(
                'INSERT INTO orderbook VALUES(?, ?, ?, ?, ?, ?, ?);',
                (counterparty, oid, ordertype, minsize, maxsize, txfee,
                 str(Decimal(cjfee))))  # any parseable Decimal is a valid cjfee
        except InvalidOperation:
            log.debug("Got invalid cjfee: " + cjfee + " from " + counterparty)
        except Exception as e:
            log.debug("Error parsing order " + oid + " from " + counterparty)
            log.debug("Exception was: " + repr(e))
        finally:
            self.dblock.release()
            return (True, [])

    def on_order_cancel(self, counterparty, oid):
        with self.dblock:
            self.db.execute(
                ("DELETE FROM orderbook WHERE "
                 "counterparty=? AND oid=?;"), (counterparty, oid))

    def on_nick_leave(self, nick):
        with self.dblock:
            self.db.execute('DELETE FROM orderbook WHERE counterparty=?;',
                            (nick,))

    def on_disconnect(self):
        with self.dblock:
            self.db.execute('DELETE FROM orderbook;')