#  BSD 3-Clause License
#
#  Copyright (c) 2019, Elasticsearch BV
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#    list of conditions and the following disclaimer.
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#    this list of conditions and the following disclaimer in the documentation
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#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
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#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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from __future__ import absolute_import

from elasticapm.contrib.asyncio.traces import async_capture_span
from elasticapm.instrumentation.packages.base import AbstractInstrumentedModule
from elasticapm.traces import execution_context


class RedisConnectionPoolInstrumentation(AbstractInstrumentedModule):
    name = "aioredis"

    instrument_list = [
        ("aioredis.pool", "ConnectionsPool.execute"),
        ("aioredis.pool", "ConnectionsPool.execute_pubsub"),
    ]

    def call(self, module, method, wrapped, instance, args, kwargs):
        if len(args) > 0:
            wrapped_name = args[0]
            if isinstance(wrapped_name, bytes):
                wrapped_name = wrapped_name.decode()
        else:
            wrapped_name = self.get_wrapped_name(wrapped, instance, method)

        with async_capture_span(
            wrapped_name, span_type="db", span_subtype="redis", span_action="query", leaf=True
        ) as span:
            if span.context is not None:
                span.context["destination"] = _get_destination_info(instance)

            return wrapped(*args, **kwargs)


class RedisPipelineInstrumentation(AbstractInstrumentedModule):
    name = "aioredis"

    instrument_list = [("aioredis.commands.transaction", "Pipeline.execute")]

    def call(self, module, method, wrapped, instance, args, kwargs):
        wrapped_name = self.get_wrapped_name(wrapped, instance, method)

        with async_capture_span(
            wrapped_name, span_type="db", span_subtype="redis", span_action="query", leaf=True
        ) as span:
            if span.context is not None:
                span.context["destination"] = _get_destination_info(instance)

            return wrapped(*args, **kwargs)


class RedisConnectionInstrumentation(AbstractInstrumentedModule):
    name = "aioredis"

    instrument_list = (
        ("aioredis.connection", "RedisConnection.execute"),
        ("aioredis.pool", "ConnectionsPool.execute_pubsub"),
    )

    def call(self, module, method, wrapped, instance, args, kwargs):
        span = execution_context.get_span()
        db_context = None
        if args and len(args) > 1:
            func_name = args[0].decode("utf-8") if isinstance(args[0], bytes) else args[0]
            db_context = {"type": "query", "statement": "{} {}".format(func_name, args[1])}
        if span and span.subtype == self.name:
            span.context["destination"] = _get_destination_info(instance)
            if db_context:
                span.context["db"] = db_context
        return wrapped(*args, **kwargs)


def _get_destination_info(connection):
    destination_info = {"service": {"name": "", "resource": "redis", "type": ""}}

    if hasattr(connection, "_pool_or_conn"):
        destination_info["port"] = int(connection._pool_or_conn.address[1])
        destination_info["address"] = connection._pool_or_conn.address[0]
    else:
        destination_info["port"] = int(connection.address[1])
        destination_info["address"] = connection.address[0]

    return destination_info
