from typing import List

from aidial_sdk.exceptions import InvalidRequestError
from google.genai.types import (
    GenerateContentConfigDict as GenAIGenerationConfig,
)
from google.genai.types import Part as GenAIPart
from vertexai.preview.generative_models import GenerationConfig

from aidial_adapter_vertexai.chat.static_tools import StaticToolsConfig
from aidial_adapter_vertexai.chat.tools import ToolsConfig
from aidial_adapter_vertexai.dial_api.request import ModelParameters


def validate_n_parameter(params: ModelParameters) -> None:
    # Currently n>1 is emulated by calling the model n times.
    # So the individual generation requests are expected to have n=1 or unset.
    if params.n is not None and params.n > 1:
        raise ValueError("n is expected to be 1 or unset")


def create_generation_config(params: ModelParameters) -> GenerationConfig:
    validate_n_parameter(params)
    return GenerationConfig(
        max_output_tokens=params.max_tokens,
        temperature=params.temperature,
        stop_sequences=params.stop,
        top_p=params.top_p,
        candidate_count=params.n,
    )


def create_genai_generation_config(
    params: ModelParameters,
    tools: ToolsConfig,
    static_tools: StaticToolsConfig,
    system_instruction: List[GenAIPart] | None = None,
) -> GenAIGenerationConfig:
    validate_n_parameter(params)
    genai_tools = None
    if not static_tools.is_empty() and not tools.is_empty():
        raise InvalidRequestError(
            "Using both 'tools' and 'static_tools' simultaneously is not supported."
        )
    elif not tools.is_empty():
        genai_tools = tools.to_gemini_genai_tools()
    elif not static_tools.is_empty():
        genai_tools = static_tools.to_gemini_genai_tools()

    return GenAIGenerationConfig(
        system_instruction=(
            list(system_instruction) if system_instruction else None
        ),
        max_output_tokens=params.max_tokens,
        temperature=params.temperature,
        stop_sequences=params.stop,
        top_p=params.top_p,
        candidate_count=params.n,
        tools=list(genai_tools) if genai_tools else None,
    )