from functools import wraps
import json
from typing import TYPE_CHECKING

import sentry_sdk
from sentry_sdk.ai.monitoring import record_token_usage
from sentry_sdk.ai.utils import set_data_normalized
from sentry_sdk.consts import OP, SPANDATA
from sentry_sdk.integrations import _check_minimum_version, DidNotEnable, Integration
from sentry_sdk.scope import should_send_default_pii
from sentry_sdk.utils import (
    capture_internal_exceptions,
    event_from_exception,
    package_version,
    safe_serialize,
)

try:
    try:
        from anthropic import NOT_GIVEN
    except ImportError:
        NOT_GIVEN = None

    from anthropic.resources import AsyncMessages, Messages

    if TYPE_CHECKING:
        from anthropic.types import MessageStreamEvent
except ImportError:
    raise DidNotEnable("Anthropic not installed")

if TYPE_CHECKING:
    from typing import Any, AsyncIterator, Iterator
    from sentry_sdk.tracing import Span


class AnthropicIntegration(Integration):
    identifier = "anthropic"
    origin = f"auto.ai.{identifier}"

    def __init__(self, include_prompts=True):
        # type: (AnthropicIntegration, bool) -> None
        self.include_prompts = include_prompts

    @staticmethod
    def setup_once():
        # type: () -> None
        version = package_version("anthropic")
        _check_minimum_version(AnthropicIntegration, version)

        Messages.create = _wrap_message_create(Messages.create)
        AsyncMessages.create = _wrap_message_create_async(AsyncMessages.create)


def _capture_exception(exc):
    # type: (Any) -> None
    event, hint = event_from_exception(
        exc,
        client_options=sentry_sdk.get_client().options,
        mechanism={"type": "anthropic", "handled": False},
    )
    sentry_sdk.capture_event(event, hint=hint)


def _get_token_usage(result):
    # type: (Messages) -> tuple[int, int]
    """
    Get token usage from the Anthropic response.
    """
    input_tokens = 0
    output_tokens = 0
    if hasattr(result, "usage"):
        usage = result.usage
        if hasattr(usage, "input_tokens") and isinstance(usage.input_tokens, int):
            input_tokens = usage.input_tokens
        if hasattr(usage, "output_tokens") and isinstance(usage.output_tokens, int):
            output_tokens = usage.output_tokens

    return input_tokens, output_tokens


def _collect_ai_data(event, model, input_tokens, output_tokens, content_blocks):
    # type: (MessageStreamEvent, str | None, int, int, list[str]) -> tuple[str | None, int, int, list[str]]
    """
    Collect model information, token usage, and collect content blocks from the AI streaming response.
    """
    with capture_internal_exceptions():
        if hasattr(event, "type"):
            if event.type == "message_start":
                usage = event.message.usage
                input_tokens += usage.input_tokens
                output_tokens += usage.output_tokens
                model = event.message.model or model
            elif event.type == "content_block_start":
                pass
            elif event.type == "content_block_delta":
                if hasattr(event.delta, "text"):
                    content_blocks.append(event.delta.text)
                elif hasattr(event.delta, "partial_json"):
                    content_blocks.append(event.delta.partial_json)
            elif event.type == "content_block_stop":
                pass
            elif event.type == "message_delta":
                output_tokens += event.usage.output_tokens

    return model, input_tokens, output_tokens, content_blocks


def _set_input_data(span, kwargs, integration):
    # type: (Span, dict[str, Any], AnthropicIntegration) -> None
    """
    Set input data for the span based on the provided keyword arguments for the anthropic message creation.
    """
    messages = kwargs.get("messages")
    if (
        messages is not None
        and len(messages) > 0
        and should_send_default_pii()
        and integration.include_prompts
    ):
        set_data_normalized(
            span, SPANDATA.GEN_AI_REQUEST_MESSAGES, safe_serialize(messages)
        )

    set_data_normalized(
        span, SPANDATA.GEN_AI_RESPONSE_STREAMING, kwargs.get("stream", False)
    )

    kwargs_keys_to_attributes = {
        "max_tokens": SPANDATA.GEN_AI_REQUEST_MAX_TOKENS,
        "model": SPANDATA.GEN_AI_REQUEST_MODEL,
        "temperature": SPANDATA.GEN_AI_REQUEST_TEMPERATURE,
        "top_k": SPANDATA.GEN_AI_REQUEST_TOP_K,
        "top_p": SPANDATA.GEN_AI_REQUEST_TOP_P,
    }
    for key, attribute in kwargs_keys_to_attributes.items():
        value = kwargs.get(key)
        if value is not NOT_GIVEN and value is not None:
            set_data_normalized(span, attribute, value)

    # Input attributes: Tools
    tools = kwargs.get("tools")
    if tools is not NOT_GIVEN and tools is not None and len(tools) > 0:
        set_data_normalized(
            span, SPANDATA.GEN_AI_REQUEST_AVAILABLE_TOOLS, safe_serialize(tools)
        )


def _set_output_data(
    span,
    integration,
    model,
    input_tokens,
    output_tokens,
    content_blocks,
    finish_span=False,
):
    # type: (Span, AnthropicIntegration, str | None, int | None, int | None, list[Any], bool) -> None
    """
    Set output data for the span based on the AI response."""
    span.set_data(SPANDATA.GEN_AI_RESPONSE_MODEL, model)
    if should_send_default_pii() and integration.include_prompts:
        set_data_normalized(
            span,
            SPANDATA.GEN_AI_RESPONSE_TEXT,
            json.dumps(content_blocks),
            unpack=False,
        )

    record_token_usage(
        span,
        input_tokens=input_tokens,
        output_tokens=output_tokens,
    )

    # TODO: GEN_AI_RESPONSE_TOOL_CALLS ?

    if finish_span:
        span.__exit__(None, None, None)


def _sentry_patched_create_common(f, *args, **kwargs):
    # type: (Any, *Any, **Any) -> Any
    integration = kwargs.pop("integration")
    if integration is None:
        return f(*args, **kwargs)

    if "messages" not in kwargs:
        return f(*args, **kwargs)

    try:
        iter(kwargs["messages"])
    except TypeError:
        return f(*args, **kwargs)

    model = kwargs.get("model", "")

    span = sentry_sdk.start_span(
        op=OP.GEN_AI_CHAT,
        name=f"chat {model}".strip(),
        origin=AnthropicIntegration.origin,
    )
    span.__enter__()

    _set_input_data(span, kwargs, integration)

    result = yield f, args, kwargs

    with capture_internal_exceptions():
        if hasattr(result, "content"):
            input_tokens, output_tokens = _get_token_usage(result)

            content_blocks = []
            for content_block in result.content:
                if hasattr(content_block, "to_dict"):
                    content_blocks.append(content_block.to_dict())
                elif hasattr(content_block, "model_dump"):
                    content_blocks.append(content_block.model_dump())
                elif hasattr(content_block, "text"):
                    content_blocks.append({"type": "text", "text": content_block.text})

            _set_output_data(
                span=span,
                integration=integration,
                model=getattr(result, "model", None),
                input_tokens=input_tokens,
                output_tokens=output_tokens,
                content_blocks=content_blocks,
                finish_span=True,
            )

        # Streaming response
        elif hasattr(result, "_iterator"):
            old_iterator = result._iterator

            def new_iterator():
                # type: () -> Iterator[MessageStreamEvent]
                model = None
                input_tokens = 0
                output_tokens = 0
                content_blocks = []  # type: list[str]

                for event in old_iterator:
                    model, input_tokens, output_tokens, content_blocks = (
                        _collect_ai_data(
                            event, model, input_tokens, output_tokens, content_blocks
                        )
                    )
                    yield event

                _set_output_data(
                    span=span,
                    integration=integration,
                    model=model,
                    input_tokens=input_tokens,
                    output_tokens=output_tokens,
                    content_blocks=[{"text": "".join(content_blocks), "type": "text"}],
                    finish_span=True,
                )

            async def new_iterator_async():
                # type: () -> AsyncIterator[MessageStreamEvent]
                model = None
                input_tokens = 0
                output_tokens = 0
                content_blocks = []  # type: list[str]

                async for event in old_iterator:
                    model, input_tokens, output_tokens, content_blocks = (
                        _collect_ai_data(
                            event, model, input_tokens, output_tokens, content_blocks
                        )
                    )
                    yield event

                _set_output_data(
                    span=span,
                    integration=integration,
                    model=model,
                    input_tokens=input_tokens,
                    output_tokens=output_tokens,
                    content_blocks=[{"text": "".join(content_blocks), "type": "text"}],
                    finish_span=True,
                )

            if str(type(result._iterator)) == "<class 'async_generator'>":
                result._iterator = new_iterator_async()
            else:
                result._iterator = new_iterator()

        else:
            span.set_data("unknown_response", True)
            span.__exit__(None, None, None)

    return result


def _wrap_message_create(f):
    # type: (Any) -> Any
    def _execute_sync(f, *args, **kwargs):
        # type: (Any, *Any, **Any) -> Any
        gen = _sentry_patched_create_common(f, *args, **kwargs)

        try:
            f, args, kwargs = next(gen)
        except StopIteration as e:
            return e.value

        try:
            try:
                result = f(*args, **kwargs)
            except Exception as exc:
                _capture_exception(exc)
                raise exc from None

            return gen.send(result)
        except StopIteration as e:
            return e.value

    @wraps(f)
    def _sentry_patched_create_sync(*args, **kwargs):
        # type: (*Any, **Any) -> Any
        integration = sentry_sdk.get_client().get_integration(AnthropicIntegration)
        kwargs["integration"] = integration

        return _execute_sync(f, *args, **kwargs)

    return _sentry_patched_create_sync


def _wrap_message_create_async(f):
    # type: (Any) -> Any
    async def _execute_async(f, *args, **kwargs):
        # type: (Any, *Any, **Any) -> Any
        gen = _sentry_patched_create_common(f, *args, **kwargs)

        try:
            f, args, kwargs = next(gen)
        except StopIteration as e:
            return await e.value

        try:
            try:
                result = await f(*args, **kwargs)
            except Exception as exc:
                _capture_exception(exc)
                raise exc from None

            return gen.send(result)
        except StopIteration as e:
            return e.value

    @wraps(f)
    async def _sentry_patched_create_async(*args, **kwargs):
        # type: (*Any, **Any) -> Any
        integration = sentry_sdk.get_client().get_integration(AnthropicIntegration)
        kwargs["integration"] = integration

        return await _execute_async(f, *args, **kwargs)

    return _sentry_patched_create_async