import json
import logging
import re
from pathlib import Path
from string import Template
from typing import Any, Dict, Mapping, Optional, Union

import httpx

from embedchain.config.base_config import BaseConfig
from embedchain.helpers.json_serializable import register_deserializable

logger = logging.getLogger(__name__)

DEFAULT_PROMPT = """
You are a Q&A expert system. Your responses must always be rooted in the context provided for each query. Here are some guidelines to follow:

1. Refrain from explicitly mentioning the context provided in your response.
2. The context should silently guide your answers without being directly acknowledged.
3. Do not use phrases such as 'According to the context provided', 'Based on the context, ...' etc.

Context information:
----------------------
$context
----------------------

Query: $query
Answer:
"""  # noqa:E501

DEFAULT_PROMPT_WITH_HISTORY = """
You are a Q&A expert system. Your responses must always be rooted in the context provided for each query. You are also provided with the conversation history with the user. Make sure to use relevant context from conversation history as needed.

Here are some guidelines to follow:

1. Refrain from explicitly mentioning the context provided in your response.
2. The context should silently guide your answers without being directly acknowledged.
3. Do not use phrases such as 'According to the context provided', 'Based on the context, ...' etc.

Context information:
----------------------
$context
----------------------

Conversation history:
----------------------
$history
----------------------

Query: $query
Answer:
"""  # noqa:E501

DEFAULT_PROMPT_WITH_DEJAVU_MEMORY = """
You are an expert at answering questions based on provided memories. You are also provided with the context and conversation history of the user. Make sure to use relevant context from conversation history and context as needed.

Here are some guidelines to follow:
1. Refrain from explicitly mentioning the context provided in your response.
2. Take into consideration the conversation history and context provided.
3. Do not use phrases such as 'According to the context provided', 'Based on the context, ...' etc.

Striclty return the query exactly as it is if it is not a question or if no relevant information is found.

Context information:
----------------------
$context
----------------------

Conversation history:
----------------------
$history
----------------------

Memories/Preferences:
----------------------
$memories
----------------------

Query: $query
Answer:
"""  # noqa:E501

DOCS_SITE_DEFAULT_PROMPT = """
You are an expert AI assistant for developer support product. Your responses must always be rooted in the context provided for each query. Wherever possible, give complete code snippet. Dont make up any code snippet on your own.

Here are some guidelines to follow:

1. Refrain from explicitly mentioning the context provided in your response.
2. The context should silently guide your answers without being directly acknowledged.
3. Do not use phrases such as 'According to the context provided', 'Based on the context, ...' etc.

Context information:
----------------------
$context
----------------------

Query: $query
Answer:
"""  # noqa:E501

DEFAULT_PROMPT_TEMPLATE = Template(DEFAULT_PROMPT)
DEFAULT_PROMPT_WITH_HISTORY_TEMPLATE = Template(DEFAULT_PROMPT_WITH_HISTORY)
DEFAULT_PROMPT_WITH_DEJAVU_MEMORY_TEMPLATE = Template(DEFAULT_PROMPT_WITH_DEJAVU_MEMORY)
DOCS_SITE_PROMPT_TEMPLATE = Template(DOCS_SITE_DEFAULT_PROMPT)
query_re = re.compile(r"\$\{*query\}*")
context_re = re.compile(r"\$\{*context\}*")
history_re = re.compile(r"\$\{*history\}*")


@register_deserializable
class BaseLlmConfig(BaseConfig):
    """
    Config for the `query` method.
    """

    def __init__(
        self,
        number_documents: int = 3,
        template: Optional[Template] = None,
        prompt: Optional[Template] = None,
        model: Optional[str] = None,
        temperature: float = 0,
        max_tokens: int = 1000,
        top_p: float = 1,
        stream: bool = False,
        online: bool = False,
        token_usage: bool = False,
        deployment_name: Optional[str] = None,
        system_prompt: Optional[str] = None,
        where: dict[str, Any] = None,
        query_type: Optional[str] = None,
        callbacks: Optional[list] = None,
        api_key: Optional[str] = None,
        base_url: Optional[str] = None,
        endpoint: Optional[str] = None,
        model_kwargs: Optional[dict[str, Any]] = None,
        http_client_proxies: Optional[Union[Dict, str]] = None,
        http_async_client_proxies: Optional[Union[Dict, str]] = None,
        local: Optional[bool] = False,
        default_headers: Optional[Mapping[str, str]] = None,
        api_version: Optional[str] = None,
    ):
        """
        Initializes a configuration class instance for the LLM.

        Takes the place of the former `QueryConfig` or `ChatConfig`.

        :param number_documents:  Number of documents to pull from the database as
        context, defaults to 1
        :type number_documents: int, optional
        :param template:  The `Template` instance to use as a template for
        prompt, defaults to None (deprecated)
        :type template: Optional[Template], optional
        :param prompt: The `Template` instance to use as a template for
        prompt, defaults to None
        :type prompt: Optional[Template], optional
        :param model: Controls the OpenAI model used, defaults to None
        :type model: Optional[str], optional
        :param temperature:  Controls the randomness of the model's output.
        Higher values (closer to 1) make output more random, lower values make it more deterministic, defaults to 0
        :type temperature: float, optional
        :param max_tokens: Controls how many tokens are generated, defaults to 1000
        :type max_tokens: int, optional
        :param top_p: Controls the diversity of words. Higher values (closer to 1) make word selection more diverse,
        defaults to 1
        :type top_p: float, optional
        :param stream: Control if response is streamed back to user, defaults to False
        :type stream: bool, optional
        :param online: Controls whether to use internet for answering query, defaults to False
        :type online: bool, optional
        :param token_usage: Controls whether to return token usage in response, defaults to False
        :type token_usage: bool, optional
        :param deployment_name: t.b.a., defaults to None
        :type deployment_name: Optional[str], optional
        :param system_prompt: System prompt string, defaults to None
        :type system_prompt: Optional[str], optional
        :param where: A dictionary of key-value pairs to filter the database results., defaults to None
        :type where: dict[str, Any], optional
        :param api_key: The api key of the custom endpoint, defaults to None
        :type api_key: Optional[str], optional
        :param endpoint: The api url of the custom endpoint, defaults to None
        :type endpoint: Optional[str], optional
        :param model_kwargs: A dictionary of key-value pairs to pass to the model, defaults to None
        :type model_kwargs: Optional[Dict[str, Any]], optional
        :param callbacks: Langchain callback functions to use, defaults to None
        :type callbacks: Optional[list], optional
        :param query_type: The type of query to use, defaults to None
        :type query_type: Optional[str], optional
        :param http_client_proxies: The proxy server settings used to create self.http_client, defaults to None
        :type http_client_proxies: Optional[Dict | str], optional
        :param http_async_client_proxies: The proxy server settings for async calls used to create
        self.http_async_client, defaults to None
        :type http_async_client_proxies: Optional[Dict | str], optional
        :param local: If True, the model will be run locally, defaults to False (for huggingface provider)
        :type local: Optional[bool], optional
        :param default_headers: Set additional HTTP headers to be sent with requests to OpenAI
        :type default_headers: Optional[Mapping[str, str]], optional
        :raises ValueError: If the template is not valid as template should
        contain $context and $query (and optionally $history)
        :raises ValueError: Stream is not boolean
        """
        if template is not None:
            logger.warning(
                "The `template` argument is deprecated and will be removed in a future version. "
                + "Please use `prompt` instead."
            )
            if prompt is None:
                prompt = template

        if prompt is None:
            prompt = DEFAULT_PROMPT_TEMPLATE

        self.number_documents = number_documents
        self.temperature = temperature
        self.max_tokens = max_tokens
        self.model = model
        self.top_p = top_p
        self.online = online
        self.token_usage = token_usage
        self.deployment_name = deployment_name
        self.system_prompt = system_prompt
        self.query_type = query_type
        self.callbacks = callbacks
        self.api_key = api_key
        self.base_url = base_url
        self.endpoint = endpoint
        self.model_kwargs = model_kwargs
        self.http_client = httpx.Client(proxies=http_client_proxies) if http_client_proxies else None
        self.http_async_client = (
            httpx.AsyncClient(proxies=http_async_client_proxies) if http_async_client_proxies else None
        )
        self.local = local
        self.default_headers = default_headers
        self.online = online
        self.api_version = api_version

        if token_usage:
            f = Path(__file__).resolve().parent.parent / "model_prices_and_context_window.json"
            self.model_pricing_map = json.load(f.open())

        if isinstance(prompt, str):
            prompt = Template(prompt)

        if self.validate_prompt(prompt):
            self.prompt = prompt
        else:
            raise ValueError("The 'prompt' should have 'query' and 'context' keys and potentially 'history' (if used).")

        if not isinstance(stream, bool):
            raise ValueError("`stream` should be bool")
        self.stream = stream
        self.where = where

    @staticmethod
    def validate_prompt(prompt: Template) -> Optional[re.Match[str]]:
        """
        validate the prompt

        :param prompt: the prompt to validate
        :type prompt: Template
        :return: valid (true) or invalid (false)
        :rtype: Optional[re.Match[str]]
        """
        return re.search(query_re, prompt.template) and re.search(context_re, prompt.template)

    @staticmethod
    def _validate_prompt_history(prompt: Template) -> Optional[re.Match[str]]:
        """
        validate the prompt with history

        :param prompt: the prompt to validate
        :type prompt: Template
        :return: valid (true) or invalid (false)
        :rtype: Optional[re.Match[str]]
        """
        return re.search(history_re, prompt.template)
