# Copyright (C) 2019 Philipp Hörist <philipp AT hoerist.com>
# Copyright (C) 2019 Pavel R. <pd at narayana dot im>

# This file is part of Gajim OTR Plugin.
#
# Gajim OTR Plugin 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; version 3 only.
#
# This software 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 can always obtain full license text at <http://www.gnu.org/licenses/>.
import sqlite3
from collections import namedtuple

class Keystore:
    SCHEMA = '''
        PRAGMA synchronous=FULL;
        CREATE TABLE IF NOT EXISTS keystore (jid TEXT, privatekey TEXT, fingerprint TEXT, trust INTEGER, timestamp INTEGER, comment TEXT, UNIQUE(privatekey)); 
        CREATE UNIQUE INDEX IF NOT EXISTS jid_fingerprint ON keystore (jid, fingerprint);
    '''   
     
    def __init__(self, db):
        self._db = sqlite3.connect(db, isolation_level=None)
        self._db.row_factory = lambda cur,row : namedtuple("Row", [col[0] for col in cur.description])(*row)
        self._db.executescript(self.SCHEMA)

    def __del__(self):
        self._db.close()

    # fetch all entries with known fingerprints: `load()` or specific entry `load(jid = jid)`
    def load(self, **args):
        sql = "SELECT * FROM keystore WHERE %s" % (not args and "fingerprint IS NOT NULL" or " AND ".join(["{0}='{1}'".format(*arg) for arg in args.items()]))
        return (args) and self._db.execute(sql).fetchone() or self._db.execute(sql).fetchall() 

    # save entry to database: save(jid=jid, fingerprint=fingerprint)
    def save(self, **args):
        sql = "REPLACE INTO keystore({0}) VALUES({1})".format(",".join(args.keys()), ",".join(["'%s'"%s for s in args.values()]))
        self._db.execute(sql)

    # delete entry from database: `delete(jid=jid) `    
    def delete(self, **args):
        sql = "DELETE FROM keystore WHERE %s" % " AND ".join(["{0}='{1}'".format(*a) for a in args.items()])
        self._db.execute(sql)