from django.contrib.gis.db.models.sql.compiler import GeoSQLCompiler as BaseGeoSQLCompiler

from django.db.backends.oracle import compiler

SQLCompiler = compiler.SQLCompiler

class GeoSQLCompiler(BaseGeoSQLCompiler, SQLCompiler):

    pass

class SQLInsertCompiler(compiler.SQLInsertCompiler, GeoSQLCompiler):

    def placeholder(self, field, val):

        if field is None:

            # A field value of None means the value is raw.

            return val

        elif hasattr(field, 'get_placeholder'):

            # Some fields (e.g. geo fields) need special munging before

            # they can be inserted.

            ph = field.get_placeholder(val, self.connection)

            if ph == 'NULL':

                # If the placeholder returned is 'NULL', then we need to

                # to remove None from the Query parameters. Specifically,

                # cx_Oracle will assume a CHAR type when a placeholder ('%s')

                # is used for columns of MDSYS.SDO_GEOMETRY.  Thus, we use

                # 'NULL' for the value, and remove None from the query params.

                # See also #10888.

                param_idx = self.query.columns.index(field.column)

                params = list(self.query.params)

                params.pop(param_idx)

                self.query.params = tuple(params)

            return ph

        else:

            # Return the common case for the placeholder

            return '%s'

class SQLDeleteCompiler(compiler.SQLDeleteCompiler, GeoSQLCompiler):

    pass

class SQLUpdateCompiler(compiler.SQLUpdateCompiler, GeoSQLCompiler):

    pass

class SQLAggregateCompiler(compiler.SQLAggregateCompiler, GeoSQLCompiler):

    pass

class SQLDateCompiler(compiler.SQLDateCompiler, GeoSQLCompiler):

    pass