"""OpenAI Responses API client for Deep Research."""

import asyncio
import time
from typing import Any
from openai import AsyncOpenAI

from .config import OPENAI_API_KEY, DEEP_RESEARCH_MODEL, POLL_INTERVAL_SECONDS


class DeepResearchClient:
    """Client for OpenAI Deep Research via Responses API."""

    def __init__(self):
        if not OPENAI_API_KEY:
            raise ValueError("OPENAI_API_KEY environment variable is required")
        self.client = AsyncOpenAI(api_key=OPENAI_API_KEY)
        self.model = DEEP_RESEARCH_MODEL

    async def start_research(
        self,
        query: str,
        system_prompt: str | None = None,
        include_code_analysis: bool = True,
    ) -> dict[str, Any]:
        """
        Start a deep research task in background mode.

        Args:
            query: The research query
            system_prompt: Optional system/developer prompt
            include_code_analysis: Whether to include code_interpreter tool

        Returns:
            Response object with id for polling
        """
        # Build input messages
        input_messages = []
        if system_prompt:
            input_messages.append({
                "role": "developer",
                "content": [{"type": "input_text", "text": system_prompt}]
            })
        input_messages.append({
            "role": "user",
            "content": [{"type": "input_text", "text": query}]
        })

        # Build tools list
        tools = [{"type": "web_search_preview"}]
        if include_code_analysis:
            tools.append({
                "type": "code_interpreter",
                "container": {"type": "auto", "file_ids": []}
            })

        # Start background research
        response = await self.client.responses.create(
            model=self.model,
            input=input_messages,
            reasoning={"summary": "auto"},
            tools=tools,
            background=True,  # Run in background for long tasks
        )

        return {
            "id": response.id,
            "status": response.status,
            "model": self.model,
            "created_at": time.time(),
        }

    async def poll_research(self, response_id: str) -> dict[str, Any]:
        """
        Poll for research completion status.

        Args:
            response_id: The response ID from start_research

        Returns:
            Status dict with completion info
        """
        response = await self.client.responses.retrieve(response_id)

        result = {
            "id": response.id,
            "status": response.status,
            "model": self.model,
        }

        if response.status == "completed":
            result["output"] = self._format_output(response)

        return result

    async def wait_for_completion(
        self,
        response_id: str,
        max_wait_minutes: int = 15,
        poll_interval: float = POLL_INTERVAL_SECONDS,
    ) -> dict[str, Any]:
        """
        Wait for research to complete, polling at intervals.

        Args:
            response_id: The response ID from start_research
            max_wait_minutes: Maximum minutes to wait
            poll_interval: Seconds between polls

        Returns:
            Final result with report and citations
        """
        start_time = time.time()
        max_wait_seconds = max_wait_minutes * 60

        while True:
            result = await self.poll_research(response_id)

            if result["status"] == "completed":
                return result

            if result["status"] in ("failed", "cancelled"):
                return {
                    **result,
                    "error": f"Research {result['status']}",
                }

            elapsed = time.time() - start_time
            if elapsed >= max_wait_seconds:
                return {
                    **result,
                    "error": f"Timeout after {max_wait_minutes} minutes",
                    "status": "timeout",
                }

            await asyncio.sleep(poll_interval)

    def _format_output(self, response) -> dict[str, Any]:
        """
        Extract structured output from completed response.

        Returns:
            Dict with report_text, citations, and metadata
        """
        output = {
            "report_text": "",
            "citations": [],
            "web_searches": 0,
            "code_executions": 0,
        }

        if not response.output:
            return output

        # Process output array
        for item in response.output:
            item_type = getattr(item, "type", None)

            # Count tool calls
            if item_type == "web_search_call":
                output["web_searches"] += 1
            elif item_type == "code_interpreter_call":
                output["code_executions"] += 1

            # Extract final message content
            if item_type == "message":
                for content in getattr(item, "content", []):
                    if getattr(content, "type", None) == "output_text":
                        output["report_text"] = content.text

                        # Extract annotations/citations
                        for annotation in getattr(content, "annotations", []):
                            if hasattr(annotation, "url"):
                                output["citations"].append({
                                    "title": getattr(annotation, "title", ""),
                                    "url": annotation.url,
                                    "start_index": getattr(annotation, "start_index", 0),
                                    "end_index": getattr(annotation, "end_index", 0),
                                })

        return output


# Singleton instance
_client: DeepResearchClient | None = None


def get_client() -> DeepResearchClient:
    """Get or create the singleton client instance."""
    global _client
    if _client is None:
        _client = DeepResearchClient()
    return _client