"""
role_router.py — Multi-model role routing (S362, aggiornato 2026-06-14 benchmark)

BENCHMARK RESULTS 2026-06-14 FINALE (14 modelli × 3 test, max_tokens corretti):
  100% qualità (ordinati per TTFT):
  #1  Groq / openai/gpt-oss-20b           — 170ms  100% ← FASTEST
  #2  Cerebras / gpt-oss-120b               — 207ms  100% ← REASONING (max_tokens≥500)
  #3  Groq / openai/gpt-oss-120b        — 235ms  100%
  #4  Cerebras / zai-glm-4.7               — 254ms  100%
  #5  Groq / compound-mini                  — 341ms  100%
  #6  SambaNova / DeepSeek-V3.1            — 482ms  100%
  #7  SambaNova / gemma-4-31B              — 2132ms 100%
  #8  OpenRouter / gpt-oss-120b:free        — 2160ms 100%

Role assignments 2026-06-14 FINALE:
  FAST       → Groq openai/gpt-oss-20b      (170ms, 100%) ← #1 assoluto
  ARCHITECT  → Groq llama-4-scout-17b 10M ctx  (244ms, 67%  — best per contesto lungo)
  CODER      → Groq openai/gpt-oss-120b    (235ms, 100%) ← #3 qualità
  TESTER     → Groq openai/gpt-oss-20b
  CONTEXT    → Groq openai/gpt-oss-20b
  RESEARCHER → Gemini 2.5-flash (599ms, 67% — math prompt-sensitive)
  REASONER   → Cerebras gpt-oss-120b (207ms, 100%, reasoning model → max_tokens≥500)
  SAMBANOVA  → SambaNova DeepSeek-V3.1 (482ms, 100%)
  DEFAULT    → AIClient() primary (openai/gpt-oss-120b o primo disponibile)

OpenRouter tenuto come fallback secondario (gpt-oss-120b:free = 1645ms ma 100% qualità).
"""
from __future__ import annotations

import os
from enum import Enum
from typing import Any

import logging
_logger = logging.getLogger("models.role_router")


class Role(str, Enum):
    FAST       = "fast"        # greetings, math semplice, identity — openai/gpt-oss-20b
    ARCHITECT  = "architect"   # planning, ragionamento complesso — llama-4-scout (10M ctx)
    CODER      = "coder"       # coding, debug — llama-3.3-70b-versatile
    TESTER     = "tester"      # test gen, debug hints — llama-3.3-70b-versatile
    CONTEXT    = "context"     # summarization, context compression — llama-3.3-70b-versatile
    DEFAULT    = "default"     # AIClient() primary
    RESEARCHER = "researcher"  # web research + document synthesis — gemini-2.0-flash-exp
    REASONER   = "reasoner"    # throughput massimo — Cerebras llama-4-scout (2000+ tok/s)
    SAMBANOVA  = "sambanova"
    NVIDIA     = "nvidia"    # NVIDIA NIM — nemotron-3-ultra-550b (1M ctx)   # DeepSeek-V3.2 via SambaNova (404ms, 100% qualità benchmark)


class RoleRouter:
    """
    Factory: `RoleRouter.get_client(Role.ARCHITECT)`.
    Restituisce un AIClient configurato per il provider ottimale del ruolo.
    Tutti i fallback sono silenziosi — restituisce sempre un AIClient valido.
    """

    @staticmethod
    def get_client(role: Role) -> Any:
        """Ritorna un AIClient pre-configurato per il ruolo richiesto."""
        try:
            if role == Role.FAST:
                return RoleRouter._fast_client()
            if role == Role.ARCHITECT:
                return RoleRouter._architect_client()
            if role == Role.CODER:
                return RoleRouter._coder_client()
            if role in (Role.TESTER, Role.CONTEXT):
                return RoleRouter._tester_client()
            if role == Role.RESEARCHER:
                return RoleRouter._researcher_client()
            if role == Role.REASONER:
                return RoleRouter._reasoner_client()
            if role == Role.SAMBANOVA:
                return RoleRouter._sambanova_client()
            if role == Role.NVIDIA:
                return RoleRouter._nvidia_client()
        except Exception as _exc:
            _logger.warning("[role_router] GAP-ROUT: fallback to default AIClient — role=%s raised %s: %s",
                            role.value, type(_exc).__name__, _exc)  # GAP-ROUT-FIX: debug→warning
        from models.ai_client import AIClient
        return AIClient()

    # ── Role-specific builders ─────────────────────────────────────────────────

    @staticmethod
    def _fast_client() -> Any:
        """Groq llama-3.3-70b-versatile — 344ms TTFT, 100% benchmark qualità.
        Usato per: greetings, calcoli semplici, identity, domande 1-liner."""
        from models.ai_client import AIClient, ProviderConfig
        groq_key = os.getenv("GROQ_API_KEY")
        if not groq_key:
            return RoleRouter._tester_client()
        client = AIClient()
        fast = ProviderConfig(
            name="groq-fast",
            api_key=groq_key,
            base_url="https://api.groq.com/openai/v1",
            default_model=os.getenv("GROQ_FAST_MODEL", "llama-3.3-70b-versatile"),
        )
        rest = [p for p in client.providers if p.name not in ("groq", "groq-fast", "groq-tester")]
        client.providers = [fast, *rest]
        client.provider_name = fast.name
        client.default_model = fast.default_model
        client.client = client._client_for(fast)
        return client

    @staticmethod
    def _architect_client() -> Any:
        """NVIDIA NIM deepseek-v4-flash (1M ctx) come primario — massima potenza per architettura.
        Fallback 1: Groq llama-4-scout (10M ctx, 480ms). Fallback 2: OpenRouter llama-4-scout:free."""
        from models.ai_client import AIClient, ProviderConfig
        nvidia_key = os.getenv("NVIDIA_API_KEY")
        if nvidia_key:
            client = AIClient()
            nvidia = ProviderConfig(
                name="nvidia-architect",
                api_key=nvidia_key,
                base_url="https://integrate.api.nvidia.com/v1",
                default_model=os.getenv("NVIDIA_ARCHITECT_MODEL", "nvidia/deepseek-v4-flash"),
            )
            rest = [p for p in client.providers if not p.name.startswith("nvidia")]
            client.providers = [nvidia, *rest]
            client.provider_name = nvidia.name
            client.default_model = nvidia.default_model
            client.client = client._client_for(nvidia)
            return client
        # Fallback 1: Groq llama-4-scout (10M ctx, 480ms)
        groq_key = os.getenv("GROQ_API_KEY")
        if groq_key:
            client = AIClient()
            architect = ProviderConfig(
                name="groq-architect",
                api_key=groq_key,
                base_url="https://api.groq.com/openai/v1",
                default_model=os.getenv("ARCHITECT_MODEL", "llama-4-scout"),
            )
            rest = [p for p in client.providers if p.name not in ("groq", "groq-architect")]
            client.providers = [architect, *rest]
            client.provider_name = architect.name
            client.default_model = architect.default_model
            client.client = client._client_for(architect)
            return client
        # Fallback: OpenRouter meta-llama/llama-4-scout:free (1645ms ma 100% qualità)
        openrouter_key = os.getenv("OPENROUTER_API_KEY")
        if openrouter_key:
            client = AIClient()
            fallback = ProviderConfig(
                name="openrouter-architect",
                api_key=openrouter_key,
                base_url="https://openrouter.ai/api/v1",
                default_model="meta-llama/llama-4-scout:free",
            )
            rest = [p for p in client.providers if not p.name.startswith("openrouter")]
            client.providers = [fallback, *rest]
            client.provider_name = fallback.name
            client.default_model = fallback.default_model
            client.client = client._client_for(fallback)
            return client
        return AIClient()

    @staticmethod
    def _coder_client() -> Any:
        """Groq llama-3.3-70b-versatile — 358ms TTFT, 100% benchmark qualità.
        AGGIORNATO 2026-08-04: era Groq openai/gpt-oss-120b.
        Fallback: OpenRouter llama-4-scout:free se GROQ_API_KEY mancante."""
        from models.ai_client import AIClient, ProviderConfig
        groq_key = os.getenv("GROQ_API_KEY")
        model = os.getenv("CODER_MODEL", "llama-3.3-70b-versatile")
        if groq_key:
            client = AIClient()
            coder = ProviderConfig(
                name="groq-coder",
                api_key=groq_key,
                base_url="https://api.groq.com/openai/v1",
                default_model=model,
            )
            rest = [p for p in client.providers if p.name not in ("groq", "groq-coder")]
            client.providers = [coder, *rest]
            client.provider_name = coder.name
            client.default_model = coder.default_model
            client.client = client._client_for(coder)
            return client
        openrouter_key = os.getenv("OPENROUTER_API_KEY")
        if openrouter_key:
            client = AIClient()
            fallback = ProviderConfig(
                name="openrouter-coder",
                api_key=openrouter_key,
                base_url="https://openrouter.ai/api/v1",
                default_model="meta-llama/llama-4-scout:free",
            )
            rest = [p for p in client.providers if not p.name.startswith("openrouter")]
            client.providers = [fallback, *rest]
            client.provider_name = fallback.name
            client.default_model = fallback.default_model
            client.client = client._client_for(fallback)
            return client
        return AIClient()

    @staticmethod
    def _researcher_client() -> Any:
        """Gemini 2.0-flash-exp — TTFT 910ms, ottima per research/synthesis/doc analysis."""
        from models.ai_client import AIClient, ProviderConfig
        gemini_key = os.getenv("GEMINI_API_KEY") or os.getenv("GOOGLE_API_KEY")
        groq_key = os.getenv("GROQ_API_KEY")
    
        if gemini_key:
            client = AIClient()
            researcher = ProviderConfig(
                name="gemini-researcher",
                api_key=gemini_key,
                base_url="https://generativelanguage.googleapis.com/v1beta/openai",
                default_model=os.getenv("GEMINI_MODEL", "gemini-2.0-flash-exp"),
            )
            rest = [p for p in client.providers if not p.name.startswith("gemini")]
            client.providers = [researcher, *rest]
            client.provider_name = researcher.name
            client.default_model = researcher.default_model
            client.client = client._client_for(researcher)
            return client
        elif groq_key:
            client = AIClient()
            groq_compound = ProviderConfig(
                name="groq-compound-researcher",
                api_key=groq_key,
                base_url="https://api.groq.com/openai/v1",
                default_model=os.getenv("GROQ_COMPOUND_MODEL", "groq/compound"),
            )
            rest = [p for p in client.providers if p.name not in ("groq", "groq-compound-researcher")]
            client.providers = [groq_compound, *rest]
            client.provider_name = groq_compound.name
            client.default_model = groq_compound.default_model
            client.client = client._client_for(groq_compound)
            return client
        return AIClient()

    @staticmethod
    def _reasoner_client() -> Any:
        """Cerebras llama-4-scout — 207ms TTFT, 100% qualità (bench 2026-08-04).
        REASONING MODEL: genera "reasoning" field prima del "content".
        Richiede max_tokens≥500 per output non-vuoto su task non-triviali.
        Fallback: _coder_client (Groq 70B) se CEREBRAS_API_KEY mancante."""
        from models.ai_client import AIClient, ProviderConfig
        cerebras_key = os.getenv("CEREBRAS_API_KEY")
        if not cerebras_key:
            return RoleRouter._coder_client()
        client = AIClient()
        reasoner = ProviderConfig(
            name="cerebras-reasoner",
            api_key=cerebras_key,
            base_url="https://api.cerebras.ai/v1",
            default_model=os.getenv("CEREBRAS_MODEL", "llama-4-scout"),
        )
        rest = [p for p in client.providers if not p.name.startswith("cerebras")]
        client.providers = [reasoner, *rest]
        client.provider_name = reasoner.name
        client.default_model = reasoner.default_model
        client.client = client._client_for(reasoner)
        return client

    @staticmethod
    def _sambanova_client() -> Any:
        """SambaNova DeepSeek-V3.1 — 482ms TTFT, 100% qualità (bench 2026-06-14).
        gemma-4-31B-it: 100% ma 2132ms. Meta-Llama: rate-limited. gpt-oss-120b: ERR.
        Fallback: _architect_client (Groq) se SAMBANOVA_API_KEY mancante."""
        from models.ai_client import AIClient, ProviderConfig
        sn_key = os.getenv("SAMBANOVA_API_KEY")
        if not sn_key:
            return RoleRouter._architect_client()
        client = AIClient()
        sambanova = ProviderConfig(
            name="sambanova",
            api_key=sn_key,
            base_url="https://api.sambanova.ai/v1",
            default_model=os.getenv("SAMBANOVA_MODEL", "DeepSeek-V3.2"),
        )
        rest = [p for p in client.providers if not p.name.startswith("sambanova")]
        client.providers = [sambanova, *rest]
        client.provider_name = sambanova.name
        client.default_model = sambanova.default_model
        client.client = client._client_for(sambanova)
        return client

    @staticmethod
    def _nvidia_client() -> Any:
        """NVIDIA NIM nemotron-3-ultra-550b-a55b — 550B params, 1M ctx, API OpenAI-compat.
        Fallback: _architect_client (Groq) se NVIDIA_API_KEY mancante."""
        from models.ai_client import AIClient, ProviderConfig
        nvidia_key = os.getenv("NVIDIA_API_KEY")
        if not nvidia_key:
            return RoleRouter._architect_client()
        client = AIClient()
        nvidia = ProviderConfig(
            name="nvidia",
            api_key=nvidia_key,
            base_url="https://integrate.api.nvidia.com/v1",
            default_model=os.getenv("NVIDIA_MODEL", "nvidia/nemotron-3-ultra-550b-a55b"),
        )
        rest = [p for p in client.providers if not p.name.startswith("nvidia")]
        client.providers = [nvidia, *rest]
        client.provider_name = nvidia.name
        client.default_model = nvidia.default_model
        client.client = client._client_for(nvidia)
        return client

    @staticmethod
    def _tester_client() -> Any:
        """Groq llama-3.3-70b-versatile — fast, sufficiente per test gen e debug hints."""
        from models.ai_client import AIClient, ProviderConfig
        groq_key = os.getenv("GROQ_API_KEY")
        if not groq_key:
            return AIClient()
        client = AIClient()
        tester = ProviderConfig(
            name="groq-tester",
            api_key=groq_key,
            base_url="https://api.groq.com/openai/v1",
            default_model=os.getenv("GROQ_FAST_MODEL", "llama-3.3-70b-versatile"),
        )
        rest = [p for p in client.providers if p.name not in ("groq", "groq-tester")]
        client.providers = [tester, *rest]
        client.provider_name = tester.name
        client.default_model = tester.default_model
        client.client = client._client_for(tester)
        return client