from pydantic import create_model, Field
from typing import Optional, List, Type
from ..function_calls import OpenAISchema


def MultiTask(
    subtask_class: Type[OpenAISchema],
    name: Optional[str] = None,
    description: Optional[str] = None,
):
    """
    Dynamically create a MultiTask OpenAISchema that can be used to segment multiple
    tasks given a base class. This creates class that can be used to create a toolkit
    for a specific task, names and descriptions are automatically generated. However
    they can be overridden.

    Note:
        Using this function is equivalent to creating a class that inherits from
        OpenAISchema and has a list of the subtask class as a field.

        ```python
        class MultiTask(OpenAISchema):
            \"""
            Correct segmentation of `{subtask_class.__name__}` tasks
            \"""
            tasks: List[subtask_class] = Field(
                default_factory=list,
                repr=False,
                description=f"Correctly segmented list of `{subtask_class.__name__}` tasks",
            )
        ```


    Parameters:
        subtask_class (Type[OpenAISchema]): The base class to use for the MultiTask
        name (Optional[str]): The name of the MultiTask class, if None then the name
            of the subtask class is used as `Multi{subtask_class.__name__}`
        description (Optional[str]): The description of the MultiTask class, if None
            then the description is set to `Correct segmentation of `{subtask_class.__name__}` tasks`

    Returns:
        schema (OpenAISchema): A new class that can be used to segment multiple tasks
    """
    task_name = subtask_class.__name__ if name is None else name

    name = f"Multi{task_name}"

    list_tasks = (
        List[subtask_class],
        Field(
            default_factory=list,
            repr=False,
            description=f"Correctly segmented list of `{task_name}` tasks",
        ),
    )

    new_cls = create_model(name, tasks=list_tasks, __base__=(OpenAISchema,))

    new_cls.__doc__ = (
        f"Correct segmentation of `{task_name}` tasks"
        if description is None
        else description
    )

    return new_cls