from abc import ABC, abstractmethod
from typing import Any

import httpx
from fastapi import HTTPException

from app.core.config import Settings, get_settings


class AIAdapter(ABC):
    """Interface for model provider adapters."""

    provider_name: str

    @abstractmethod
    def ask(self, prompt: str, context: dict[str, Any] | None = None) -> dict[str, Any]:
        raise NotImplementedError


class NoopAdapter(AIAdapter):
    """Deterministic adapter used when no model provider is configured."""

    provider_name = "noop"

    def ask(self, prompt: str, context: dict[str, Any] | None = None) -> dict[str, Any]:
        return {
            "answer": (
                "AI provider is not configured yet. This is a deterministic placeholder. "
                "Set MODEL_PROVIDER to openclaw_hermes, openclaw, hermes, or direct_llm "
                "after credentials are ready."
            ),
            "raw": {"prompt": prompt, "context": context or {}},
        }


class OpenClawAdapter(AIAdapter):
    """Adapter for an OpenClaw-compatible agent endpoint."""

    provider_name = "openclaw"

    def __init__(self, settings: Settings):
        self.settings = settings

    def ask(self, prompt: str, context: dict[str, Any] | None = None) -> dict[str, Any]:
        url = f"{self.settings.openclaw_base_url.rstrip('/')}/api/v1/agent/ask"
        headers = {}
        if self.settings.openclaw_api_key:
            headers["Authorization"] = f"Bearer {self.settings.openclaw_api_key}"
        payload = {"prompt": prompt, "context": context or {}}
        with httpx.Client(timeout=60) as client:
            response = client.post(url, json=payload, headers=headers)
        if response.status_code >= 400:
            raise HTTPException(status_code=502, detail={"openclaw_error": response.text})
        data = response.json()
        return {"answer": data.get("answer") or data.get("content") or str(data), "raw": data}


class HermesAdapter(AIAdapter):
    """Adapter for a Hermes-compatible memory or agent endpoint."""

    provider_name = "hermes"

    def __init__(self, settings: Settings):
        self.settings = settings

    def ask(self, prompt: str, context: dict[str, Any] | None = None) -> dict[str, Any]:
        url = f"{self.settings.hermes_base_url.rstrip('/')}/api/v1/ask"
        headers = {}
        if self.settings.hermes_api_key:
            headers["Authorization"] = f"Bearer {self.settings.hermes_api_key}"
        payload = {"prompt": prompt, "context": context or {}}
        with httpx.Client(timeout=60) as client:
            response = client.post(url, json=payload, headers=headers)
        if response.status_code >= 400:
            raise HTTPException(status_code=502, detail={"hermes_error": response.text})
        data = response.json()
        return {"answer": data.get("answer") or data.get("content") or str(data), "raw": data}


class OpenClawHermesAdapter(AIAdapter):
    """Compose Hermes memory with OpenClaw execution."""

    provider_name = "openclaw_hermes"

    def __init__(self, settings: Settings):
        self.openclaw = OpenClawAdapter(settings)
        self.hermes = HermesAdapter(settings)

    def ask(self, prompt: str, context: dict[str, Any] | None = None) -> dict[str, Any]:
        base_context = context or {}
        recall = self._recall_memory(prompt, base_context)
        openclaw_context = {
            **base_context,
            "agent_pipeline": self.provider_name,
            "hermes_memory": recall["answer"],
        }
        openclaw_result = self.openclaw.ask(prompt, openclaw_context)
        remember = self._remember_interaction(prompt, base_context, openclaw_result["answer"])
        return {
            "answer": openclaw_result["answer"],
            "raw": {
                "pipeline": "hermes_recall -> openclaw_answer -> hermes_remember",
                "hermes_recall": recall,
                "openclaw": openclaw_result.get("raw", {}),
                "hermes_remember": remember,
            },
        }

    def _recall_memory(self, prompt: str, context: dict[str, Any]) -> dict[str, Any]:
        recall_prompt = (
            "Retrieve concise long-term memory, preferences, prior decisions, and relevant "
            "business context for this request. Return only information useful to answer it."
        )
        try:
            result = self.hermes.ask(
                recall_prompt,
                {
                    "mode": "memory_recall",
                    "user_prompt": prompt,
                    "request_context": context,
                },
            )
        except Exception as exc:  # Hermes memory should not block OpenClaw execution.
            return {"answer": "", "raw": {}, "error": _error_detail(exc)}
        return {"answer": result["answer"], "raw": result.get("raw", {})}

    def _remember_interaction(
        self,
        prompt: str,
        context: dict[str, Any],
        answer: str,
    ) -> dict[str, Any]:
        remember_prompt = (
            "Store durable lessons from this interaction for future company management "
            "assistance. Ignore transient details and do not store secrets."
        )
        try:
            result = self.hermes.ask(
                remember_prompt,
                {
                    "mode": "memory_write",
                    "user_prompt": prompt,
                    "request_context": context,
                    "assistant_answer": answer,
                },
            )
        except Exception as exc:
            return {"ok": False, "raw": {}, "error": _error_detail(exc)}
        return {"ok": True, "raw": result.get("raw", {}), "answer": result["answer"]}


class DirectLLMAdapter(AIAdapter):
    """Adapter for OpenAI-compatible chat completions APIs."""

    provider_name = "direct_llm"

    def __init__(self, settings: Settings):
        self.settings = settings

    def ask(self, prompt: str, context: dict[str, Any] | None = None) -> dict[str, Any]:
        if not self.settings.direct_llm_api_key:
            raise HTTPException(status_code=503, detail="DIRECT_LLM_API_KEY is not configured")
        url = f"{self.settings.direct_llm_base_url.rstrip('/')}/chat/completions"
        headers = {"Authorization": f"Bearer {self.settings.direct_llm_api_key}"}
        messages = [
            {
                "role": "system",
                "content": (
                    "You are a company management AI. Be concise, cite data from context, "
                    "and never approve payments, performance changes, or trades automatically."
                ),
            },
            {"role": "user", "content": f"Context:\n{context or {}}\n\nTask:\n{prompt}"},
        ]
        payload = {"model": self.settings.direct_llm_model, "messages": messages}
        with httpx.Client(timeout=60) as client:
            response = client.post(url, json=payload, headers=headers)
        if response.status_code >= 400:
            raise HTTPException(status_code=502, detail={"llm_error": response.text})
        data = response.json()
        answer = data["choices"][0]["message"]["content"]
        return {"answer": answer, "raw": data}


def get_adapter() -> AIAdapter:
    """Return the configured AI provider adapter."""

    settings = get_settings()
    provider = settings.model_provider.lower()
    if provider == "openclaw":
        return OpenClawAdapter(settings)
    if provider == "hermes":
        return HermesAdapter(settings)
    if provider in {"openclaw_hermes", "openclaw-hermes", "hybrid"}:
        return OpenClawHermesAdapter(settings)
    if provider == "direct_llm":
        return DirectLLMAdapter(settings)
    return NoopAdapter()


def _error_detail(exc: Exception) -> Any:
    if isinstance(exc, HTTPException):
        return exc.detail
    return {"type": type(exc).__name__, "message": str(exc)}