"""OpenAI Responses API request and response adapters."""

from __future__ import annotations

import json
from typing import Any

from core.llm.types import ToolCall

_RESPONSE_OUTPUT_KEY = "_openai_response_output"


def uses_responses_api(model: str, api_key_env: str) -> bool:
    """Return whether this official OpenAI model requires the Responses API."""
    return api_key_env == "OPENAI_API_KEY" and model.lower().startswith("gpt-5.6")


def responses_tool_specs(tools: list[dict[str, Any]]) -> list[dict[str, Any]]:
    """Convert externally tagged Chat Completions tools to Responses tools."""
    converted: list[dict[str, Any]] = []
    for tool in tools:
        function = tool.get("function")
        if tool.get("type") != "function" or not isinstance(function, dict):
            converted.append(dict(tool))
            continue
        converted.append(
            {
                "type": "function",
                "name": function.get("name", ""),
                "description": function.get("description", ""),
                "parameters": function.get("parameters", {}),
                "strict": function.get("strict", False),
            }
        )
    return converted


def responses_input(messages: list[dict[str, Any]]) -> list[dict[str, Any]]:
    """Convert the runtime's Chat-shaped transcript to Responses input items."""
    items: list[dict[str, Any]] = []
    for message in messages:
        response_output = message.get(_RESPONSE_OUTPUT_KEY)
        if isinstance(response_output, list):
            items.extend(dict(item) for item in response_output if isinstance(item, dict))
            continue

        role = message.get("role")
        if role == "tool":
            items.append(
                {
                    "type": "function_call_output",
                    "call_id": str(message.get("tool_call_id", "")),
                    "output": str(message.get("content", "")),
                }
            )
            continue

        content = message.get("content", "")
        if role == "assistant" and message.get("tool_calls"):
            if content:
                items.append({"role": "assistant", "content": str(content)})
            for tool_call in message["tool_calls"]:
                if not isinstance(tool_call, dict):
                    continue
                function = tool_call.get("function", {})
                if not isinstance(function, dict):
                    continue
                items.append(
                    {
                        "type": "function_call",
                        "call_id": str(tool_call.get("id", "")),
                        "name": str(function.get("name", "")),
                        "arguments": str(function.get("arguments", "{}")),
                    }
                )
            continue

        items.append({"role": str(role or "user"), "content": str(content)})
    return items


def response_output_items(response: Any) -> list[dict[str, Any]]:
    """Serialize Responses output items for stateless replay on the next turn."""
    serialized: list[dict[str, Any]] = []
    for item in getattr(response, "output", []) or []:
        if hasattr(item, "model_dump"):
            serialized.append(item.model_dump(exclude_none=True))
        elif isinstance(item, dict):
            serialized.append(dict(item))
    return serialized


def response_tool_calls(response: Any) -> list[ToolCall]:
    """Extract function calls from a Responses API result."""
    tool_calls: list[ToolCall] = []
    for item in getattr(response, "output", []) or []:
        if getattr(item, "type", None) != "function_call":
            continue
        raw_arguments = str(getattr(item, "arguments", "") or "")
        try:
            arguments = json.loads(raw_arguments) if raw_arguments else {}
        except (json.JSONDecodeError, ValueError):
            arguments = {}
        tool_calls.append(
            ToolCall(
                id=str(getattr(item, "call_id", "")),
                name=str(getattr(item, "name", "")),
                input=arguments if isinstance(arguments, dict) else {},
            )
        )
    return tool_calls


def response_raw_message(response: Any) -> dict[str, Any]:
    """Build the replayable assistant message stored in the runtime transcript."""
    message: dict[str, Any] = {
        "role": "assistant",
        "content": str(getattr(response, "output_text", "") or ""),
        _RESPONSE_OUTPUT_KEY: response_output_items(response),
    }
    tool_calls = response_tool_calls(response)
    if tool_calls:
        message["tool_calls"] = [
            {
                "id": tool_call.id,
                "type": "function",
                "function": {
                    "name": tool_call.name,
                    "arguments": json.dumps(tool_call.input),
                },
            }
            for tool_call in tool_calls
        ]
    return message