"""Parallel.ai web search (sync ``Parallel`` SDK) + async extract (``AsyncParallel``).

Env: ``PARALLEL_API_KEY`` (https://parallel.ai), optional
``PARALLEL_SEARCH_MODE`` = agentic (default) | fast | one-shot.
"""

from __future__ import annotations

import asyncio
import logging
import os
from typing import Any, Dict, List

from plugins.web._common import (
    SEARCH_LIMIT_CAP,
    BaseWebSearchProvider,
    cached_sdk_client,
    document,
    keyless_variant_schema,
    provider_env,
    run_extract_async,
    run_search,
    search_ok,
    use_keyless,
    web_hit,
)

logger = logging.getLogger(__name__)

_MISSING_KEY = "PARALLEL_API_KEY environment variable not set. Get your API key at https://parallel.ai"


def _client(slot: str, cls_name: str) -> Any:
    def _factory(api_key: str) -> Any:
        import parallel  # deliberately lazy

        return getattr(parallel, cls_name)(api_key=api_key)

    return cached_sdk_client(slot, "PARALLEL_API_KEY", _MISSING_KEY, "search.parallel", _factory)


def _get_sync_client() -> Any:
    return _client("_parallel_client", "Parallel")


def _get_async_client() -> Any:
    return _client("_async_parallel_client", "AsyncParallel")


# Names re-exported by tools.web_tools for existing tests/callers.
_get_parallel_client = _get_sync_client
_get_async_parallel_client = _get_async_client


def _resolve_search_mode() -> str:
    mode = os.getenv("PARALLEL_SEARCH_MODE", "agentic").lower().strip()
    return mode if mode in {"fast", "one-shot", "agentic"} else "agentic"


class ParallelWebSearchProvider(BaseWebSearchProvider):
    """Parallel.ai search + async extract provider."""

    NAME = "parallel"
    DISPLAY_NAME = "Parallel"
    KEY_ENV = "PARALLEL_API_KEY"
    EXTRACT = True
    KEYLESS = True

    def search(self, query: str, limit: int = 5) -> Dict[str, Any]:
        def _body() -> Dict[str, Any]:
            from plugins.web.keyless_mcp import search_with_failover

            if use_keyless("parallel", provider_env("PARALLEL_API_KEY")):
                logger.info("Parallel keyless search: '%s' (limit=%d)", query, limit)
                return search_with_failover("parallel", query, limit)

            mode = _resolve_search_mode()
            logger.info("Parallel search: '%s' (mode=%s, limit=%d)", query, mode, limit)
            response = _get_sync_client().beta.search(
                search_queries=[query], objective=query, mode=mode, max_results=min(limit, SEARCH_LIMIT_CAP)
            )
            return search_ok([
                web_hit(r.url or "", r.title or "", " ".join(r.excerpts or []), i + 1)
                for i, r in enumerate(response.results or [])
            ])

        return run_search("Parallel", logger, _body, sdk=True)

    async def extract(self, urls: List[str], **kwargs: Any) -> List[Dict[str, Any]]:
        async def _body() -> List[Dict[str, Any]]:
            from plugins.web.keyless_mcp import extract_with_failover

            if use_keyless("parallel", provider_env("PARALLEL_API_KEY")):
                # Keyless ring is blocking HTTP — hop off the event loop.
                logger.info("Parallel keyless extract: %d URL(s)", len(urls))
                return await asyncio.to_thread(extract_with_failover, "parallel", list(urls))

            logger.info("Parallel extract: %d URL(s)", len(urls))
            response = await _get_async_client().beta.extract(urls=urls, full_content=True)

            results = [
                document(r.url or "", r.title or "", r.full_content or "\n\n".join(r.excerpts or []))
                for r in response.results or []
            ]
            for error in response.errors or []:
                results.append({
                    "url": error.url or "", "title": "", "content": "",
                    "error": error.content or error.error_type or "extraction failed",
                    "metadata": {"sourceURL": error.url or ""},
                })
            return results

        return await run_extract_async("Parallel", logger, urls, _body, sdk=True)

    def get_setup_schema(self) -> Dict[str, Any]:
        return keyless_variant_schema(
            "Parallel", "PARALLEL_API_KEY", "https://parallel.ai",
            free_tag="Objective-tuned search + page extraction on Parallel's anonymous free tier. Rate-limited under burst load.",
            paid_tag="Objective-tuned search + parallel page extraction via the Parallel SDK. Unthrottled, guaranteed service.",
        )