# -*- coding: utf-8 -*-
"""
pluto/modes.py — Real mode switching engine.

Groq primary:
  - MODE_QUICK:     llama-3.1-8b-instant   (fast, lightweight)
  - MODE_REASONING: llama-3.3-70b-versatile (deep, accurate)
  - MODE_VISION:    llama-3.1-8b-instant   (text/doc understanding)

Mistral fallback (if Groq fails or no key):
  - All modes: mistral-small-latest

Real switching = True because MODE_QUICK uses 8b and MODE_REASONING uses 70b.
"""

from __future__ import annotations

import os
from dataclasses import dataclass

from dotenv import load_dotenv

load_dotenv()


def _clean_api_key(api_key: str | None) -> str:
    cleaned = str(api_key or "").strip().strip('"').strip("'")
    if cleaned.lower().startswith("bearer "):
        cleaned = cleaned[7:].strip()
    return cleaned


def _looks_like_nvidia_key(api_key: str) -> bool:
    return _clean_api_key(api_key).startswith("nvapi-")


@dataclass(frozen=True)
class ModeConfig:
    """Concrete model configuration for a single processing mode."""

    mode_name: str
    model_id: str
    temperature: float
    max_tokens: int
    compute_profile: str
    provider: str  # "nvidia" | "groq" | "mistral"

    def to_log_dict(self) -> dict:
        return {
            "mode_name": self.mode_name,
            "model_id": self.model_id,
            "temperature": self.temperature,
            "max_tokens": self.max_tokens,
            "compute_profile": self.compute_profile,
            "provider": self.provider,
        }


def _build_registry() -> dict[str, ModeConfig]:
    """
    NVIDIA NIM model stack — Pluto v2.

    Roles:
      MODE_QUICK     → Nemotron Nano 8B  (high-volume: extraction workers, critic, judge)
      MODE_REASONING → Nemotron Super 49B (synthesis, strategist audit, debate responder)
      MODE_VISION    → Nemotron Nano VL   (doc parsing: tables, figures, scanned PDFs)
      MODE_ULTRA     → Nemotron Ultra 253B (escalation only: confidence < 0.6)

    Embedding + reranking are handled separately in embedder.py and dispatcher.py
    (they use /v1/embeddings and scoring endpoints, not chat completions).

    Fallback: if NVIDIA_API_KEY absent, fall back to Groq or Mistral.
    """
    # Check for any NVIDIA key
    nvidia_keys = [
        "NVIDIA_API_KEY", "NVIDIA_API_KEY_NANO", "NVIDIA_API_KEY_SUPER",
        "NVIDIA_API_KEY_VL", "NVIDIA_API_KEY_EMBED", "NVIDIA_API_KEY_RERANK",
        "NVIDIA_API_KEY_ULTRA"
    ]
    nvidia_ready = any(_clean_api_key(os.getenv(k)) for k in nvidia_keys)
    groq_key = _clean_api_key(os.getenv("GROQ_API_KEY", ""))
    mistral_key = _clean_api_key(os.getenv("MISTRAL_API_KEY", ""))

    if nvidia_ready:
        return {
            "MODE_QUICK": ModeConfig(
                mode_name="MODE_QUICK",
                model_id="meta/llama-3.2-3b-instruct",
                temperature=0.1,
                max_tokens=1024,
                compute_profile="low-latency",
                provider="nvidia",
            ),
            "MODE_REASONING": ModeConfig(
                mode_name="MODE_REASONING",
                model_id="nvidia/nemotron-3-nano-omni-30b-a3b-reasoning",
                temperature=0.3,
                max_tokens=4096,
                compute_profile="high-reasoning",
                provider="nvidia",
            ),
            "MODE_VISION": ModeConfig(
                mode_name="MODE_VISION",
                model_id="nvidia/llama-3.1-nemotron-nano-vl-8b-v1",
                temperature=0.1,
                max_tokens=4096,
                compute_profile="vision-capable",
                provider="nvidia",
            ),
            "MODE_ULTRA": ModeConfig(
                mode_name="MODE_ULTRA",
                model_id="nvidia/llama-3.1-nemotron-ultra-253b-v1",
                temperature=0.2,
                max_tokens=4096,
                compute_profile="deep-reasoning",
                provider="nvidia",
            ),
            # Keep MODE_GEMINI name for backward compat — maps to Super
            "MODE_GEMINI": ModeConfig(
                mode_name="MODE_GEMINI",
                model_id="nvidia/nemotron-3-nano-omni-30b-a3b-reasoning",
                temperature=0.0,
                max_tokens=4096,
                compute_profile="high-throughput",
                provider="nvidia",
            ),
        }
    elif groq_key:
        # Groq fallback — same size tiers
        return {
            "MODE_QUICK": ModeConfig(
                mode_name="MODE_QUICK",
                model_id="llama-3.1-8b-instant",
                temperature=0.1,
                max_tokens=1024,
                compute_profile="low-latency",
                provider="groq",
            ),
            "MODE_REASONING": ModeConfig(
                mode_name="MODE_REASONING",
                model_id="llama-3.3-70b-versatile",
                temperature=0.3,
                max_tokens=4096,
                compute_profile="high-reasoning",
                provider="groq",
            ),
            "MODE_VISION": ModeConfig(
                mode_name="MODE_VISION",
                model_id="llama-3.1-8b-instant",
                temperature=0.1,
                max_tokens=4096,
                compute_profile="vision-capable",
                provider="groq",
            ),
            "MODE_ULTRA": ModeConfig(
                mode_name="MODE_ULTRA",
                model_id="llama-3.3-70b-versatile",
                temperature=0.2,
                max_tokens=4096,
                compute_profile="deep-reasoning",
                provider="groq",
            ),
            "MODE_GEMINI": ModeConfig(
                mode_name="MODE_GEMINI",
                model_id="llama-3.3-70b-versatile",
                temperature=0.0,
                max_tokens=4096,
                compute_profile="high-throughput",
                provider="groq",
            ),
        }
    if mistral_key and not _looks_like_nvidia_key(mistral_key):
        return _build_mistral_registry()
    return _build_unconfigured_registry()


def _build_mistral_registry() -> dict[str, ModeConfig]:
    """Use Mistral for every mode when it is the only configured chat provider."""
    return {
        "MODE_QUICK": ModeConfig(
            mode_name="MODE_QUICK",
            model_id="mistral-small-latest",
            temperature=0.1,
            max_tokens=1024,
            compute_profile="fallback",
            provider="mistral",
        ),
        "MODE_REASONING": ModeConfig(
            mode_name="MODE_REASONING",
            model_id="mistral-small-latest",
            temperature=0.3,
            max_tokens=4096,
            compute_profile="fallback",
            provider="mistral",
        ),
        "MODE_VISION": ModeConfig(
            mode_name="MODE_VISION",
            model_id="mistral-small-latest",
            temperature=0.1,
            max_tokens=4096,
            compute_profile="fallback",
            provider="mistral",
        ),
        "MODE_ULTRA": ModeConfig(
            mode_name="MODE_ULTRA",
            model_id="mistral-small-latest",
            temperature=0.2,
            max_tokens=4096,
            compute_profile="fallback",
            provider="mistral",
        ),
        "MODE_GEMINI": ModeConfig(
            mode_name="MODE_GEMINI",
            model_id="mistral-small-latest",
            temperature=0.0,
            max_tokens=4096,
            compute_profile="fallback",
            provider="mistral",
        ),
    }


def _build_unconfigured_registry() -> dict[str, ModeConfig]:
    """Return placeholder modes so imports work without provider credentials."""
    return {
        "MODE_QUICK": ModeConfig(
            mode_name="MODE_QUICK",
            model_id="unconfigured/MODE_QUICK",
            temperature=0.1,
            max_tokens=1024,
            compute_profile="unconfigured",
            provider="unconfigured",
        ),
        "MODE_REASONING": ModeConfig(
            mode_name="MODE_REASONING",
            model_id="unconfigured/MODE_REASONING",
            temperature=0.3,
            max_tokens=4096,
            compute_profile="unconfigured",
            provider="unconfigured",
        ),
        "MODE_VISION": ModeConfig(
            mode_name="MODE_VISION",
            model_id="unconfigured/MODE_VISION",
            temperature=0.1,
            max_tokens=4096,
            compute_profile="unconfigured",
            provider="unconfigured",
        ),
        "MODE_ULTRA": ModeConfig(
            mode_name="MODE_ULTRA",
            model_id="unconfigured/MODE_ULTRA",
            temperature=0.2,
            max_tokens=4096,
            compute_profile="unconfigured",
            provider="unconfigured",
        ),
        "MODE_GEMINI": ModeConfig(
            mode_name="MODE_GEMINI",
            model_id="unconfigured/MODE_GEMINI",
            temperature=0.0,
            max_tokens=4096,
            compute_profile="unconfigured",
            provider="unconfigured",
        ),
    }


MODE_REGISTRY: dict[str, ModeConfig] = _build_registry()


def _missing_provider_error() -> EnvironmentError:
    return EnvironmentError("None of NVIDIA_API_KEY, GROQ_API_KEY, or MISTRAL_API_KEY is set.")


def _is_unconfigured() -> bool:
    return any(mode.provider == "unconfigured" for mode in MODE_REGISTRY.values())


def _refresh_mode_registry() -> None:
    """Refresh mode config in place so imported MODE_REGISTRY references stay valid."""
    MODE_REGISTRY.clear()
    MODE_REGISTRY.update(_build_registry())


def is_real_switching() -> bool:
    """True if MODE_QUICK and MODE_REASONING use DIFFERENT model_ids."""
    if _is_unconfigured():
        _refresh_mode_registry()
    if _is_unconfigured():
        return False
    quick = MODE_REGISTRY["MODE_QUICK"].model_id
    reasoning = MODE_REGISTRY["MODE_REASONING"].model_id
    return quick != reasoning


def get_mode(mode_name: str) -> ModeConfig:
    """Look up a mode config by name."""
    if mode_name not in MODE_REGISTRY:
        raise ValueError(f"Unknown mode: {mode_name}. Valid: {list(MODE_REGISTRY)}")
    mode = MODE_REGISTRY[mode_name]
    if mode.provider == "unconfigured":
        _refresh_mode_registry()
        mode = MODE_REGISTRY.get(mode_name)
    if mode is None:
        raise ValueError(f"Unknown mode: {mode_name}. Valid: {list(MODE_REGISTRY)}")
    if mode.provider == "unconfigured":
        raise _missing_provider_error()
    return mode