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

from opentelemetry._logs import LogRecord
from opentelemetry.instrumentation.langchain.event_models import (
    ChoiceEvent,
    MessageEvent,
)
from opentelemetry.instrumentation.langchain.utils import (
    should_emit_events,
    should_send_prompts,
)
from opentelemetry.semconv._incubating.attributes import (
    gen_ai_attributes as GenAIAttributes,
)

from .config import Config


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: "langchain"}
"""The attributes to be used for the event."""


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

    Args:
        event: The event to emit.
    """
    if not should_emit_events():
        return

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


def _emit_message_event(event: MessageEvent) -> 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
    )
    Config.event_logger.emit(log_record)


def _emit_choice_event(event: ChoiceEvent) -> 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"
    )
    Config.event_logger.emit(log_record)