"""Conversation support for OpenAI."""

from typing import Literal

from homeassistant.components import assist_pipeline, conversation
from homeassistant.config_entries import ConfigSubentry
from homeassistant.const import CONF_LLM_HASS_API, MATCH_ALL
from homeassistant.core import HomeAssistant
from homeassistant.helpers import intent
from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback

from . import OpenAIConfigEntry
from .const import CONF_PROMPT, DOMAIN
from .entity import OpenAIBaseLLMEntity

# Max number of back and forth with the LLM to generate a response


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: OpenAIConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    """Set up conversation entities."""
    for subentry in config_entry.subentries.values():
        if subentry.subentry_type != "conversation":
            continue

        async_add_entities(
            [OpenAIConversationEntity(config_entry, subentry)],
            config_subentry_id=subentry.subentry_id,
        )


class OpenAIConversationEntity(
    conversation.ConversationEntity,
    conversation.AbstractConversationAgent,
    OpenAIBaseLLMEntity,
):
    """OpenAI conversation agent."""

    _attr_supports_streaming = True

    def __init__(self, entry: OpenAIConfigEntry, subentry: ConfigSubentry) -> None:
        """Initialize the agent."""
        super().__init__(entry, subentry)
        if self.subentry.data.get(CONF_LLM_HASS_API):
            self._attr_supported_features = (
                conversation.ConversationEntityFeature.CONTROL
            )

    @property
    def supported_languages(self) -> list[str] | Literal["*"]:
        """Return a list of supported languages."""
        return MATCH_ALL

    async def async_added_to_hass(self) -> None:
        """When entity is added to Home Assistant."""
        await super().async_added_to_hass()
        assist_pipeline.async_migrate_engine(
            self.hass, "conversation", self.entry.entry_id, self.entity_id
        )
        conversation.async_set_agent(self.hass, self.entry, self)

    async def async_will_remove_from_hass(self) -> None:
        """When entity will be removed from Home Assistant."""
        conversation.async_unset_agent(self.hass, self.entry)
        await super().async_will_remove_from_hass()

    async def _async_handle_message(
        self,
        user_input: conversation.ConversationInput,
        chat_log: conversation.ChatLog,
    ) -> conversation.ConversationResult:
        """Process the user input and call the API."""
        options = self.subentry.data

        try:
            await chat_log.async_provide_llm_data(
                user_input.as_llm_context(DOMAIN),
                options.get(CONF_LLM_HASS_API),
                options.get(CONF_PROMPT),
                user_input.extra_system_prompt,
            )
        except conversation.ConverseError as err:
            return err.as_conversation_result()

        await self._async_handle_chat_log(chat_log)

        intent_response = intent.IntentResponse(language=user_input.language)
        assert type(chat_log.content[-1]) is conversation.AssistantContent
        intent_response.async_set_speech(chat_log.content[-1].content or "")
        return conversation.ConversationResult(
            response=intent_response,
            conversation_id=chat_log.conversation_id,
            continue_conversation=chat_log.continue_conversation,
        )