"""Onionr - Private P2P Communication.

Handle maintenance of a blacklist database, for blocks and peers
"""
import sqlite3
import os

from onionrplugins.onionrevents import event
import onionrcrypto
from onionrutils import epoch, bytesconverter
from coredb import dbfiles
"""
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
"""


class OnionrBlackList:
    def __init__(self):
        self.blacklistDB = dbfiles.blacklist_db

        if not os.path.exists(dbfiles.blacklist_db):
            self.generateDB()
        return

    def inBlacklist(self, data):
        hashed = bytesconverter.bytes_to_str(onionrcrypto.hashers.sha3_hash(data))
        retData = False

        if not hashed.isalnum():
            raise Exception("Hashed data is not alpha numeric")
        if len(hashed) > 64:
            raise Exception("Hashed data is too large")

        for i in self._dbExecute("SELECT * FROM blacklist WHERE hash = ?", (hashed,)):
            retData = True # this only executes if an entry is present by that hash
            break

        return retData

    def _dbExecute(self, toExec, params = ()):
        conn = sqlite3.connect(self.blacklistDB)
        c = conn.cursor()
        retData = c.execute(toExec, params)
        conn.commit()
        return retData

    def deleteBeforeDate(self, date):
        # TODO, delete blacklist entries before date
        return

    def deleteExpired(self, dataType=0):
        """Delete expired entries"""
        deleteList = []
        curTime = epoch.get_epoch()

        try:
            int(dataType)
        except AttributeError:
            raise TypeError("dataType must be int")

        for i in self._dbExecute('SELECT * FROM blacklist WHERE dataType = ?', (dataType,)):
            if i[1] == dataType:
                if (curTime - i[2]) >= i[3]:
                    deleteList.append(i[0])

        for thing in deleteList:
            self._dbExecute("DELETE FROM blacklist WHERE hash = ?", (thing,))

    def generateDB(self):
        return

    def clearDB(self):
        self._dbExecute("""DELETE FROM blacklist;""")

    def getList(self):
        data = self._dbExecute('SELECT * FROM blacklist')
        myList = []
        for i in data:
            myList.append(i[0])
        return myList

    def addToDB(self, data, dataType=0, expire=0):
        """Add to the blacklist. Intended to be block hash, block data, peers, or transport addresses
        0=block
        1=peer
        2=pubkey
        """

        # we hash the data so we can remove data entirely from our node's disk
        hashed = bytesconverter.bytes_to_str(onionrcrypto.hashers.sha3_hash(data))

        event('blacklist_add', data={'data': data, 'hash': hashed})

        if len(hashed) > 64:
            raise Exception("Hashed data is too large")

        if not hashed.isalnum():
            raise Exception("Hashed data is not alpha numeric")
        try:
            int(dataType)
        except ValueError:
            raise Exception("dataType is not int")
        try:
            int(expire)
        except ValueError:
            raise Exception("expire is not int")
        if self.inBlacklist(hashed):
            return
        insert = (hashed,)
        blacklistDate = epoch.get_epoch()
        try:
            self._dbExecute("INSERT INTO blacklist (hash, dataType, blacklistDate, expire) VALUES(?, ?, ?, ?);", (str(hashed), dataType, blacklistDate, expire))
        except sqlite3.IntegrityError:
            pass