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from __future__ import absolute_import

from elasticapm.instrumentation.packages.dbapi2 import (
    ConnectionProxy,
    CursorProxy,
    DbApi2Instrumentation,
    extract_signature,
)
from elasticapm.instrumentation.packages.psycopg2 import get_destination_info
from elasticapm.traces import capture_span


class PGCursorProxy(CursorProxy):
    provider_name = "postgresql"

    def _bake_sql(self, sql):
        # If this is a Composable object, use its `as_string` method.
        # See https://www.psycopg.org/psycopg3/docs/api/sql.html
        if hasattr(sql, "as_string"):
            sql = sql.as_string(self.__wrapped__)
        # If the sql string is already a byte string, we need to decode it using the connection encoding
        if isinstance(sql, bytes):
            sql = sql.decode(self.connection.info.encoding)
        return sql

    def extract_signature(self, sql):
        return extract_signature(sql)

    def __enter__(self):
        return PGCursorProxy(self.__wrapped__.__enter__(), destination_info=self._self_destination_info)

    @property
    def _self_database(self):
        return self.connection.info.dbname or ""


class PGConnectionProxy(ConnectionProxy):
    cursor_proxy = PGCursorProxy

    def __enter__(self):
        return PGConnectionProxy(self.__wrapped__.__enter__(), destination_info=self._self_destination_info)


class PsycopgInstrumentation(DbApi2Instrumentation):
    name = "psycopg"

    instrument_list = [("psycopg", "connect")]

    def call(self, module, method, wrapped, instance, args, kwargs):
        signature = "psycopg.connect"

        host, port = get_destination_info(kwargs.get("host"), kwargs.get("port"))
        database = kwargs.get("dbname")
        signature = f"{signature} {host}:{port}"
        destination_info = {
            "address": host,
            "port": port,
        }
        with capture_span(
            signature,
            span_type="db",
            span_subtype="postgresql",
            span_action="connect",
            leaf=True,
            extra={"destination": destination_info, "db": {"type": "sql", "instance": database}},
        ):
            return PGConnectionProxy(wrapped(*args, **kwargs), destination_info=destination_info)