"""Wraps the openai calls in generic functions.

Supports chat, image, edit, and embeddings.
Allows custom endpoints for each of the above supported functions.
"""

from __future__ import annotations

from typing import TYPE_CHECKING, cast

import openai

if TYPE_CHECKING:
    from io import BufferedReader, BytesIO

    from openai.types.chat import ChatCompletionMessageParam


def chat_completion(
    system_prompt: str,
    user_prompt: str,
    *,
    openai_url: str,
    openai_api_key: str,
    model: str,
    max_tokens: int = 1000,
) -> str:
    """Send a chat completion request and return the response.

    Args:
        system_prompt: The system prompt to use.
        user_prompt: The user prompt to send.
        openai_url: The OpenAI-compatible API URL.
        openai_api_key: The API key for authentication.
        model: The model to use for completion.
        max_tokens: Maximum number of tokens to generate.

    Returns:
        The model's response text, stripped of whitespace.

    """
    client = openai.OpenAI(base_url=openai_url, api_key=openai_api_key)
    messages: list[ChatCompletionMessageParam] = [
        {
            "role": "system",
            "content": system_prompt,
        },
        {
            "role": "user",
            "content": user_prompt,
        },
    ]
    response = client.chat.completions.create(
        model=model,
        messages=messages,
        max_tokens=max_tokens,
    )

    content = response.choices[0].message.content
    if content:
        return content.strip()
    return ""


def chat_completion_with_history(
    system_prompt: str,
    prompts: list[dict[str, str]],
    *,
    openai_url: str,
    openai_api_key: str,
    model: str,
    max_tokens: int = 1000,
) -> str:
    """Send a chat completion request with conversation history.

    Args:
        system_prompt: The system prompt to use.
        prompts: List of prompt dicts with role and content.
        openai_url: The OpenAI-compatible API URL.
        openai_api_key: The API key for authentication.
        model: The model to use for completion.
        max_tokens: Maximum number of tokens to generate.

    Returns:
        The model's response text, stripped of whitespace.

    """
    client = openai.OpenAI(base_url=openai_url, api_key=openai_api_key)
    messages: list[ChatCompletionMessageParam] = [
        cast(
            "ChatCompletionMessageParam",
            {
                "role": "system",
                "content": system_prompt,
            },
        ),
    ]
    messages.extend(cast("list[ChatCompletionMessageParam]", prompts))
    response = client.chat.completions.create(
        model=model,
        messages=messages,
        max_tokens=max_tokens,
        seed=-1,
    )

    content = response.choices[0].message.content
    if content:
        return content.strip()
    return ""


def chat_completion_instruct(
    system_prompt: str,
    user_prompt: str,
    *,
    openai_url: str,
    openai_api_key: str,
    model: str,
    max_tokens: int = 1000,
) -> str:
    """Send an instruction-based chat completion request.

    Args:
        system_prompt: The system prompt to use.
        user_prompt: The user prompt to send.
        openai_url: The OpenAI-compatible API URL.
        openai_api_key: The API key for authentication.
        model: The model to use for completion.
        max_tokens: Maximum number of tokens to generate.

    Returns:
        The model's response text, stripped of whitespace.

    """
    client = openai.OpenAI(base_url=openai_url, api_key=openai_api_key)
    messages: list[ChatCompletionMessageParam] = [
        {
            "role": "system",
            "content": system_prompt,
        },
        {
            "role": "user",
            "content": user_prompt,
        },
    ]
    response = client.chat.completions.create(
        model=model,
        messages=messages,
        max_tokens=max_tokens,
        seed=-1,
    )

    content = response.choices[0].message.content
    if content:
        return content.strip()
    return ""


def image_generation(
    prompt: str,
    openai_url: str,
    openai_api_key: str,
    n: int = 1,
) -> str:
    """Generate an image using the given prompt.

    Args:
        prompt: The image generation prompt.
        openai_url: The OpenAI-compatible API URL.
        openai_api_key: The API key for authentication.
        n: Number of images to generate.

    Returns:
        The base64 encoded image data. Decode and write to a file.

    """
    client = openai.OpenAI(base_url=openai_url, api_key=openai_api_key)
    response = client.images.generate(
        prompt=prompt,
        n=n,
        size="1024x1024",
        model="gen",
    )
    if response.data:
        return response.data[0].b64_json or ""
    return ""


def image_edit(
    image: BufferedReader | BytesIO | list[BufferedReader] | list[BytesIO],
    prompt: str,
    openai_url: str,
    openai_api_key: str,
    n: int = 1,
) -> str:
    """Edit an existing image using a prompt.

    Args:
        image: The source image as a file-like object or list thereof.
        prompt: The edit instruction.
        openai_url: The OpenAI-compatible API URL.
        openai_api_key: The API key for authentication.
        n: Number of edited images to generate.

    Returns:
        The base64 encoded edited image data.

    """
    client = openai.OpenAI(base_url=openai_url, api_key=openai_api_key)
    response = client.images.edit(
        image=image,
        prompt=prompt,
        n=n,
        size="1024x1024",
        model="edit",
    )
    if response.data:
        return response.data[0].b64_json or ""
    return ""


def embedding(
    text: str,
    *,
    openai_url: str,
    openai_api_key: str,
    model: str,
) -> list[float]:
    """Generate an embedding vector for the given text.

    Args:
        text: The text to embed.
        openai_url: The OpenAI-compatible API URL.
        openai_api_key: The API key for authentication.
        model: The embedding model to use.

    Returns:
        The embedding vector as a list of floats, or an empty list on failure.

    """
    client = openai.OpenAI(base_url=openai_url, api_key=openai_api_key)
    response = client.embeddings.create(
        input=[text],
        model=model,
        encoding_format="float",
    )
    if response:
        data = response.data
        raw_data = data[0].embedding
        # The result could be an array of floats or a single float.
        if not isinstance(raw_data, float):
            return list(raw_data)
        return [raw_data]
    return []