import json
import logging
from dataclasses import asdict
from enum import Enum
from typing import Union

from opentelemetry._logs import Logger, LogRecord
from opentelemetry.instrumentation.sagemaker.event_models import (
    ChoiceEvent,
    MessageEvent,
)
from opentelemetry.instrumentation.sagemaker.reusable_streaming_body import (
    ReusableStreamingBody,
)
from opentelemetry.instrumentation.sagemaker.streaming_wrapper import StreamingWrapper
from opentelemetry.instrumentation.sagemaker.utils import (
    should_emit_events,
    should_send_prompts,
)
from opentelemetry.semconv._incubating.attributes import (
    gen_ai_attributes as GenAIAttributes,
)

logger = logging.getLogger(__name__)


class Roles(Enum):
    USER = "user"
    ASSISTANT = "assistant"
    SYSTEM = "system"
    TOOL = "tool"


VALID_MESSAGE_ROLES = {role.value for role in Roles}
"""The valid roles for naming the message event."""

EVENT_ATTRIBUTES = {GenAIAttributes.GEN_AI_SYSTEM: "sagemaker"}
"""The attributes to be used for the event."""


def emit_message_event(kwargs, event_logger):
    try:
        input_body = json.loads(kwargs.get("Body"))
    except json.JSONDecodeError:
        logger.debug(
            "OpenTelemetry failed to decode the request body, error: %s",
            kwargs.get("Body"),
        )
        return
    emit_event(
        MessageEvent(content=input_body.get("inputs", ""), role="user"), event_logger
    )


def emit_choice_events(response: dict, event_logger):
    response_body: Union[StreamingWrapper, ReusableStreamingBody, None] = response.get(
        "Body"
    )

    if isinstance(response_body, StreamingWrapper):
        emit_event(
            ChoiceEvent(
                index=0,
                message={
                    "content": response_body.accumulating_body,
                    "role": "assistant",
                },
                finish_reason="unknown",
            ),
            event_logger,
        )
    elif isinstance(response_body, ReusableStreamingBody):
        for i, gen in enumerate(json.loads(response_body.read())):
            emit_event(
                ChoiceEvent(
                    index=i,
                    message={"content": gen.get("generated_text"), "role": "assistant"},
                    finish_reason="unknown",
                ),
                event_logger,
            )


def emit_event(
    event: Union[MessageEvent, ChoiceEvent], event_logger: Union[Logger, None]
) -> None:
    """
    Emit an event to the OpenTelemetry SDK.

    Args:
        event: The event to emit.
    """
    if not should_emit_events() or event_logger is None:
        return

    if isinstance(event, MessageEvent):
        _emit_message_event(event, event_logger)
    elif isinstance(event, ChoiceEvent):
        _emit_choice_event(event, event_logger)
    else:
        raise TypeError("Unsupported event type")


def _emit_message_event(event: MessageEvent, event_logger: Logger) -> None:
    body = asdict(event)

    if event.role in VALID_MESSAGE_ROLES:
        name = "gen_ai.{}.message".format(event.role)
        # According to the semantic conventions, the role is conditionally required if available
        # and not equal to the "role" in the message name. So, remove the role from the body if
        # it is the same as the in the event name.
        body.pop("role", None)
    else:
        name = "gen_ai.user.message"

    # According to the semantic conventions, only the assistant role has tool call
    if event.role != Roles.ASSISTANT.value and event.tool_calls is not None:
        del body["tool_calls"]
    elif event.tool_calls is None:
        del body["tool_calls"]

    if not should_send_prompts():
        del body["content"]
        if body.get("tool_calls") is not None:
            for tool_call in body["tool_calls"]:
                tool_call["function"].pop("arguments", None)

    log_record = LogRecord(
        body=body,
        attributes=EVENT_ATTRIBUTES,
        event_name=name
    )
    event_logger.emit(log_record)


def _emit_choice_event(event: ChoiceEvent, event_logger: Logger) -> None:
    body = asdict(event)
    if event.message["role"] == Roles.ASSISTANT.value:
        # According to the semantic conventions, the role is conditionally required if available
        # and not equal to "assistant", so remove the role from the body if it is "assistant".
        body["message"].pop("role", None)

    if event.tool_calls is None:
        del body["tool_calls"]

    if not should_send_prompts():
        body["message"].pop("content", None)
        if body.get("tool_calls") is not None:
            for tool_call in body["tool_calls"]:
                tool_call["function"].pop("arguments", None)

    log_record = LogRecord(
        body=body,
        attributes=EVENT_ATTRIBUTES,
        event_name="gen_ai.choice"

    )
    event_logger.emit(log_record)