"""v2 patch mechanism using hierarchical registry.

Simplified patching logic that uses the v2 mode registry for handler dispatch.
"""

from __future__ import annotations

import logging
import warnings
from collections.abc import Awaitable
from functools import wraps
from typing import TYPE_CHECKING, Any, Protocol, TypeVar, cast, overload

from pydantic import BaseModel

from instructor.v2.core.mode import Mode
from instructor.v2.core.providers import Provider
from instructor.v2.core.hooks import Hooks
from instructor.v2.core.templating import handle_templating
from instructor.v2.core.utils import is_async
from instructor.v2.core.exceptions import RegistryValidationMixin
from instructor.v2.core.registry import mode_registry
from instructor.v2.core.response_model import prepare_response_model
from instructor.v2.core.retry import retry_async_v2, retry_sync_v2

if TYPE_CHECKING:
    from collections.abc import Awaitable, Callable

    from openai import AsyncOpenAI, OpenAI
    from tenacity import AsyncRetrying, Retrying

logger = logging.getLogger("instructor.v2")

T_Model = TypeVar("T_Model", bound=BaseModel)
T_Retval = TypeVar("T_Retval")


class InstructorChatCompletionCreate(Protocol):
    def __call__(
        self,
        response_model: type[T_Model] | None = None,
        context: dict[str, Any] | None = None,
        max_retries: int | Retrying = 1,
        *args: Any,
        **kwargs: Any,
    ) -> T_Model: ...


class AsyncInstructorChatCompletionCreate(Protocol):
    async def __call__(
        self,
        response_model: type[T_Model] | None = None,
        context: dict[str, Any] | None = None,
        max_retries: int | AsyncRetrying = 1,
        *args: Any,
        **kwargs: Any,
    ) -> T_Model: ...


@overload
def patch_v2(
    func: Callable[..., Awaitable[Any]],
    provider: Provider,
    mode: Mode,
    default_model: str | None = None,
) -> Callable[..., Awaitable[T_Model]]: ...


@overload
def patch_v2(
    func: Callable[..., Any],
    provider: Provider,
    mode: Mode,
    default_model: str | None = None,
) -> Callable[..., T_Model]: ...


def patch_v2(
    func: Callable[..., Any],
    provider: Provider,
    mode: Mode,
    default_model: str | None = None,
) -> Callable[..., Any]:
    """Patch a function to use v2 registry for structured outputs.

    Args:
        func: Function to patch (e.g., client.messages.create)
        provider: Provider enum value
        mode: Mode enum value
        default_model: Default model to inject if not provided in request

    Returns:
        Patched function that supports response_model parameter

    Raises:
        RegistryError: If mode is not registered for provider
    """
    logger.debug(f"Patching with v2 registry: {provider=}, {mode=}, {default_model=}")

    # Validate mode registration
    RegistryValidationMixin.validate_mode_registration(provider, mode)

    func_is_async = is_async(func)

    if func_is_async:
        return _create_async_wrapper(func, provider, mode, default_model)
    return _create_sync_wrapper(func, provider, mode, default_model)


@overload
def patch(
    client: OpenAI,
    mode: Mode = Mode.TOOLS,
    provider: Provider = Provider.OPENAI,
) -> OpenAI: ...


@overload
def patch(
    client: AsyncOpenAI,
    mode: Mode = Mode.TOOLS,
    provider: Provider = Provider.OPENAI,
) -> AsyncOpenAI: ...


@overload
def patch(
    create: Callable[..., T_Retval],
    mode: Mode = Mode.TOOLS,
    provider: Provider = Provider.OPENAI,
) -> InstructorChatCompletionCreate: ...


@overload
def patch(
    create: Awaitable[T_Retval],
    mode: Mode = Mode.TOOLS,
    provider: Provider = Provider.OPENAI,
) -> InstructorChatCompletionCreate: ...


def patch(
    client: OpenAI | AsyncOpenAI | None = None,
    create: Callable[..., T_Retval] | None = None,
    mode: Mode = Mode.TOOLS,
    provider: Provider = Provider.OPENAI,
) -> OpenAI | AsyncOpenAI | InstructorChatCompletionCreate:
    """Patch chat-completion create methods with v2 registry handlers."""
    logger.debug(f"Patching `client.chat.completions.create` with {mode=}")

    if create is not None:
        func = create
    elif client is not None:
        func = client.chat.completions.create
    else:
        raise ValueError("Either client or create must be provided")

    new_create = patch_v2(func=func, provider=provider, mode=mode)

    if client is not None:
        cast(Any, client.chat.completions).create = new_create
        return client
    return new_create


def apatch(
    client: AsyncOpenAI,
    mode: Mode = Mode.TOOLS,
    provider: Provider = Provider.OPENAI,
) -> AsyncOpenAI:
    """Deprecated alias for :func:`patch`."""
    warnings.warn(
        "apatch is deprecated, use patch instead",
        DeprecationWarning,
        stacklevel=2,
    )
    return patch(client, mode=mode, provider=provider)


def _create_sync_wrapper(
    func: Callable[..., Any],
    provider: Provider,
    mode: Mode,
    default_model: str | None = None,
) -> Callable[..., T_Model]:
    """Create synchronous wrapper for patched function."""

    @wraps(func)
    def new_create_sync(
        response_model: type[T_Model] | None = None,
        context: dict[str, Any] | None = None,
        max_retries: int | Retrying = 1,
        strict: bool = True,
        hooks: Hooks | None = None,
        *args: Any,
        **kwargs: Any,
    ) -> T_Model:
        """Patched synchronous create function."""
        autodetect_images = bool(kwargs.get("autodetect_images", False))
        cache = kwargs.pop("cache", None)
        cache_ttl_raw = kwargs.pop("cache_ttl", None)
        cache_ttl = cache_ttl_raw if isinstance(cache_ttl_raw, int) else None

        # Inject default model if not provided and available
        if default_model is not None and "model" not in kwargs:
            kwargs["model"] = default_model

        # Get handlers from registry
        handlers = mode_registry.get_handlers(provider, mode)

        if response_model is not None:
            response_model = prepare_response_model(response_model)

        # Prepare request kwargs using registry handler
        response_model, new_kwargs = handlers.request_handler(
            response_model=response_model, kwargs=kwargs
        )
        new_kwargs.pop("autodetect_images", None)
        if handlers.message_converter and "messages" in new_kwargs:
            new_kwargs["messages"] = handlers.message_converter(
                new_kwargs["messages"],
                autodetect_images=autodetect_images,
            )

        # Handle templating
        new_kwargs = handle_templating(
            new_kwargs,
            mode=mode,
            provider=provider,
            context=context,
        )

        # Attempt cache lookup before retry layer
        if cache is not None and response_model is not None:
            from instructor.cache import BaseCache, make_cache_key, load_cached_response

            if isinstance(cache, BaseCache):
                key = make_cache_key(
                    messages=new_kwargs.get("messages")
                    or new_kwargs.get("contents")
                    or new_kwargs.get("chat_history"),
                    model=new_kwargs.get("model"),
                    response_model=response_model,
                    mode=str(mode.value),
                )
                cached = load_cached_response(cache, key, response_model)
                if cached is not None:
                    return cached  # type: ignore[return-value]

        # Use v2 retry logic with registry handlers
        response = retry_sync_v2(
            func=func,
            response_model=response_model,
            provider=provider,
            mode=mode,
            context=context,
            max_retries=max_retries,
            args=args,
            kwargs=new_kwargs,
            strict=strict,
            hooks=hooks,
        )

        # Store in cache after successful call
        if cache is not None and response_model is not None:
            try:
                from instructor.cache import (
                    BaseCache,
                    make_cache_key,
                    store_cached_response,
                )
                from pydantic import BaseModel as _BM  # type: ignore[import-not-found]

                if isinstance(cache, BaseCache) and isinstance(response, _BM):
                    key = make_cache_key(
                        messages=new_kwargs.get("messages")
                        or new_kwargs.get("contents")
                        or new_kwargs.get("chat_history"),
                        model=new_kwargs.get("model"),
                        response_model=response_model,
                        mode=str(mode.value),
                    )
                    store_cached_response(cache, key, response, ttl=cache_ttl)
            except ModuleNotFoundError:
                pass

        return response  # type: ignore[return-value]

    return new_create_sync  # type: ignore[return-value]


def _create_async_wrapper(
    func: Callable[..., Awaitable[Any]],
    provider: Provider,
    mode: Mode,
    default_model: str | None = None,
) -> Callable[..., Awaitable[T_Model]]:
    """Create asynchronous wrapper for patched function."""

    @wraps(func)
    async def new_create_async(
        response_model: type[T_Model] | None = None,
        context: dict[str, Any] | None = None,
        max_retries: int | AsyncRetrying = 1,
        strict: bool = True,
        hooks: Hooks | None = None,
        *args: Any,
        **kwargs: Any,
    ) -> T_Model:
        """Patched asynchronous create function."""
        autodetect_images = bool(kwargs.get("autodetect_images", False))
        cache = kwargs.pop("cache", None)
        cache_ttl_raw = kwargs.pop("cache_ttl", None)
        cache_ttl = cache_ttl_raw if isinstance(cache_ttl_raw, int) else None

        # Inject default model if not provided and available
        if default_model is not None and "model" not in kwargs:
            kwargs["model"] = default_model

        # Get handlers from registry
        handlers = mode_registry.get_handlers(provider, mode)

        if response_model is not None:
            response_model = prepare_response_model(response_model)

        # Prepare request kwargs using registry handler
        response_model, new_kwargs = handlers.request_handler(
            response_model=response_model, kwargs=kwargs
        )
        new_kwargs.pop("autodetect_images", None)
        if handlers.message_converter and "messages" in new_kwargs:
            new_kwargs["messages"] = handlers.message_converter(
                new_kwargs["messages"],
                autodetect_images=autodetect_images,
            )

        # Handle templating
        new_kwargs = handle_templating(
            new_kwargs,
            mode=mode,
            provider=provider,
            context=context,
        )

        # Attempt cache lookup before retry layer
        if cache is not None and response_model is not None:
            from instructor.cache import BaseCache, make_cache_key, load_cached_response

            if isinstance(cache, BaseCache):
                key = make_cache_key(
                    messages=new_kwargs.get("messages")
                    or new_kwargs.get("contents")
                    or new_kwargs.get("chat_history"),
                    model=new_kwargs.get("model"),
                    response_model=response_model,
                    mode=str(mode.value),
                )
                cached = load_cached_response(cache, key, response_model)
                if cached is not None:
                    return cached  # type: ignore[return-value]

        # Use v2 retry logic with registry handlers
        response = await retry_async_v2(
            func=func,
            response_model=response_model,
            provider=provider,
            mode=mode,
            context=context,
            max_retries=max_retries,
            args=args,
            kwargs=new_kwargs,
            strict=strict,
            hooks=hooks,
        )

        # Store in cache after successful call
        if cache is not None and response_model is not None:
            try:
                from instructor.cache import (
                    BaseCache,
                    make_cache_key,
                    store_cached_response,
                )
                from pydantic import BaseModel as _BM  # type: ignore[import-not-found]

                if isinstance(cache, BaseCache) and isinstance(response, _BM):
                    key = make_cache_key(
                        messages=new_kwargs.get("messages")
                        or new_kwargs.get("contents")
                        or new_kwargs.get("chat_history"),
                        model=new_kwargs.get("model"),
                        response_model=response_model,
                        mode=str(mode.value),
                    )
                    store_cached_response(cache, key, response, ttl=cache_ttl)
            except ModuleNotFoundError:
                pass

        return response  # type: ignore[return-value]

    return new_create_async  # type: ignore[return-value]