"""Utility functions for PydanticAI span instrumentation."""

import sentry_sdk
from sentry_sdk._types import BLOB_DATA_SUBSTITUTE
from sentry_sdk.ai.utils import get_modality_from_mime_type
from sentry_sdk.consts import SPANDATA

from ..consts import DATA_URL_BASE64_REGEX

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from typing import Union, Dict, Any
    from pydantic_ai.usage import RequestUsage, RunUsage  # type: ignore


def _serialize_image_url_item(item: "Any") -> "Dict[str, Any]":
    """Serialize an ImageUrl content item for span data.

    For data URLs containing base64-encoded images, the content is redacted.
    For regular HTTP URLs, the URL string is preserved.
    """
    url = str(item.url)
    data_url_match = DATA_URL_BASE64_REGEX.match(url)

    if data_url_match:
        return {
            "type": "image",
            "content": BLOB_DATA_SUBSTITUTE,
        }

    return {
        "type": "image",
        "content": url,
    }


def _serialize_binary_content_item(item: "Any") -> "Dict[str, Any]":
    """Serialize a BinaryContent item for span data, redacting the blob data."""
    return {
        "type": "blob",
        "modality": get_modality_from_mime_type(item.media_type),
        "mime_type": item.media_type,
        "content": BLOB_DATA_SUBSTITUTE,
    }


def _set_usage_data(
    span: "sentry_sdk.tracing.Span", usage: "Union[RequestUsage, RunUsage]"
) -> None:
    """Set token usage data on a span.

    This function works with both RequestUsage (single request) and
    RunUsage (agent run) objects from pydantic_ai.

    Args:
        span: The Sentry span to set data on.
        usage: RequestUsage or RunUsage object containing token usage information.
    """
    if usage is None:
        return

    if hasattr(usage, "input_tokens") and usage.input_tokens is not None:
        span.set_data(SPANDATA.GEN_AI_USAGE_INPUT_TOKENS, usage.input_tokens)

    # Pydantic AI uses cache_read_tokens (not input_tokens_cached)
    if hasattr(usage, "cache_read_tokens") and usage.cache_read_tokens is not None:
        span.set_data(
            SPANDATA.GEN_AI_USAGE_INPUT_TOKENS_CACHED, usage.cache_read_tokens
        )

    # Pydantic AI uses cache_write_tokens (not input_tokens_cache_write)
    if hasattr(usage, "cache_write_tokens") and usage.cache_write_tokens is not None:
        span.set_data(
            SPANDATA.GEN_AI_USAGE_INPUT_TOKENS_CACHE_WRITE,
            usage.cache_write_tokens,
        )

    if hasattr(usage, "output_tokens") and usage.output_tokens is not None:
        span.set_data(SPANDATA.GEN_AI_USAGE_OUTPUT_TOKENS, usage.output_tokens)

    if hasattr(usage, "total_tokens") and usage.total_tokens is not None:
        span.set_data(SPANDATA.GEN_AI_USAGE_TOTAL_TOKENS, usage.total_tokens)