##############################################################################
# The MIT License (MIT)
#
# Copyright (c) 2016-2019 Hajime Nakagami<nakagami@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
##############################################################################


class Cursor:
    def __init__(self, connection):
        self.connection = connection
        self.description = []
        self._rows = []
        self.arraysize = 1
        self.query = None

    def __enter__(self):
        return self

    def __exit__(self, exc, value, traceback):
        self.close()

    def callproc(self, procname, args=()):
        from drda import NotSupportedError
        raise NotSupportedError()

    def nextset(self, procname, args=()):
        from drda import NotSupportedError
        raise NotSupportedError()

    def setinputsizes(sizes):
        pass

    def setoutputsize(size, column=None):
        pass

    def execute(self, query, args=[]):
        if args and self.connection.db_type == 'derby':
            raise NotImplementedError(
                "pydrda can't execute with paramters against derby"
            )
        self.query = query
        if query.strip().split()[0].upper() == 'SELECT':
            self._rows, self.description = self.connection._query(self.query, args)
        else:
            self.connection._execute(self.query, args)

    def executemany(self, query, seq_of_params):
        rowcount = 0
        for params in seq_of_params:
            self.execute(query, params)
            rowcount += self._rowcount
        self._rowcount = rowcount

    def fetchone(self):
        from drda import OperationalError
        if not self.connection or not self.connection.is_connect():
            raise OperationalError(u"08003:Lost connection")
        if len(self._rows):
            return self._rows.popleft()
        return None

    def fetchmany(self, size=1):
        rs = []
        for i in range(size):
            r = self.fetchone()
            if not r:
                break
            rs.append(r)
        return rs

    def fetchall(self):
        r = list(self._rows)
        self._rows.clear()
        return r

    def close(self):
        self.connection = None

    @property
    def rowcount(self):
        return self._rowcount

    @property
    def closed(self):
        return self.connection is None or not self.connection.is_connect()

    def __iter__(self):
        return self

    def __next__(self):
        r = self.fetchone()
        if not r:
            raise StopIteration()
        return r
