hermes_cli/runtime_provider.py

"""Shared runtime provider resolution for CLI, gateway, cron, and helpers."""

from __future__ import annotations

import os
from typing import Any, Dict, Optional

from hermes_cli import auth as auth_mod
from hermes_cli.auth import (
    AuthError,
    PROVIDER_REGISTRY,
    format_auth_error,
    resolve_provider,
    resolve_nous_runtime_credentials,
    resolve_codex_runtime_credentials,
    resolve_api_key_provider_credentials,
    resolve_external_process_provider_credentials,
    has_usable_secret,
)
from hermes_cli.config import load_config
from hermes_constants import OPENROUTER_BASE_URL


def _normalize_custom_provider_name(value: str) -> str:
    return value.strip().lower().replace(" ", "-")


def _detect_api_mode_for_url(base_url: str) -> Optional[str]:
    """Auto-detect api_mode from the resolved base URL.

    Direct api.openai.com endpoints need the Responses API for GPT-5.x
    tool calls with reasoning (chat/completions returns 400).
    """
    normalized = (base_url or "").strip().lower().rstrip("/")
    if "api.openai.com" in normalized and "openrouter" not in normalized:
        return "codex_responses"
    return None


def _auto_detect_local_model(base_url: str) -> str:
    """Query a local server for its model name when only one model is loaded."""
    if not base_url:
        return ""
    try:
        import requests
        url = base_url.rstrip("/")
        if not url.endswith("/v1"):
            url += "/v1"
        resp = requests.get(url + "/models", timeout=5)
        if resp.ok:
            models = resp.json().get("data", [])
            if len(models) == 1:
                model_id = models[0].get("id", "")
                if model_id:
                    return model_id
    except Exception:
        pass
    return ""


def _get_model_config() -> Dict[str, Any]:
    config = load_config()
    model_cfg = config.get("model")
    if isinstance(model_cfg, dict):
        cfg = dict(model_cfg)
        default = cfg.get("default", "").strip()
        base_url = cfg.get("base_url", "").strip()
        is_local = "localhost" in base_url or "127.0.0.1" in base_url
        is_fallback = not default or default == "anthropic/claude-opus-4.6"
        if is_local and is_fallback and base_url:
            detected = _auto_detect_local_model(base_url)
            if detected:
                cfg["default"] = detected
        return cfg
    if isinstance(model_cfg, str) and model_cfg.strip():
        return {"default": model_cfg.strip()}
    return {}


def _copilot_runtime_api_mode(model_cfg: Dict[str, Any], api_key: str) -> str:
    configured_mode = _parse_api_mode(model_cfg.get("api_mode"))
    if configured_mode:
        return configured_mode

    model_name = str(model_cfg.get("default") or "").strip()
    if not model_name:
        return "chat_completions"

    try:
        from hermes_cli.models import copilot_model_api_mode

        return copilot_model_api_mode(model_name, api_key=api_key)
    except Exception:
        return "chat_completions"


_VALID_API_MODES = {"chat_completions", "codex_responses", "anthropic_messages"}


def _parse_api_mode(raw: Any) -> Optional[str]:
    """Validate an api_mode value from config. Returns None if invalid."""
    if isinstance(raw, str):
        normalized = raw.strip().lower()
        if normalized in _VALID_API_MODES:
            return normalized
    return None


def resolve_requested_provider(requested: Optional[str] = None) -> str:
    """Resolve provider request from explicit arg, config, then env."""
    if requested and requested.strip():
        return requested.strip().lower()

    model_cfg = _get_model_config()
    cfg_provider = model_cfg.get("provider")
    if isinstance(cfg_provider, str) and cfg_provider.strip():
        return cfg_provider.strip().lower()

    # Prefer the persisted config selection over any stale shell/.env
    # provider override so chat uses the endpoint the user last saved.
    env_provider = os.getenv("HERMES_INFERENCE_PROVIDER", "").strip().lower()
    if env_provider:
        return env_provider

    return "auto"


def _get_named_custom_provider(requested_provider: str) -> Optional[Dict[str, Any]]:
    requested_norm = _normalize_custom_provider_name(requested_provider or "")
    if not requested_norm or requested_norm == "custom":
        return None

    # Raw names should only map to custom providers when they are not already
    # valid built-in providers or aliases. Explicit menu keys like
    # ``custom:local`` always target the saved custom provider.
    if requested_norm == "auto":
        return None
    if not requested_norm.startswith("custom:"):
        try:
            auth_mod.resolve_provider(requested_norm)
        except AuthError:
            pass
        else:
            return None

    config = load_config()
    custom_providers = config.get("custom_providers")
    if not isinstance(custom_providers, list):
        return None

    for entry in custom_providers:
        if not isinstance(entry, dict):
            continue
        name = entry.get("name")
        base_url = entry.get("base_url")
        if not isinstance(name, str) or not isinstance(base_url, str):
            continue
        name_norm = _normalize_custom_provider_name(name)
        menu_key = f"custom:{name_norm}"
        if requested_norm not in {name_norm, menu_key}:
            continue
        result = {
            "name": name.strip(),
            "base_url": base_url.strip(),
            "api_key": str(entry.get("api_key", "") or "").strip(),
        }
        api_mode = _parse_api_mode(entry.get("api_mode"))
        if api_mode:
            result["api_mode"] = api_mode
        return result

    return None


def _resolve_named_custom_runtime(
    *,
    requested_provider: str,
    explicit_api_key: Optional[str] = None,
    explicit_base_url: Optional[str] = None,
) -> Optional[Dict[str, Any]]:
    custom_provider = _get_named_custom_provider(requested_provider)
    if not custom_provider:
        return None

    base_url = (
        (explicit_base_url or "").strip()
        or custom_provider.get("base_url", "")
    ).rstrip("/")
    if not base_url:
        return None

    api_key_candidates = [
        (explicit_api_key or "").strip(),
        str(custom_provider.get("api_key", "") or "").strip(),
        os.getenv("OPENAI_API_KEY", "").strip(),
        os.getenv("OPENROUTER_API_KEY", "").strip(),
    ]
    api_key = next((candidate for candidate in api_key_candidates if has_usable_secret(candidate)), "")

    return {
        "provider": "custom",
        "api_mode": custom_provider.get("api_mode")
        or _detect_api_mode_for_url(base_url)
        or "chat_completions",
        "base_url": base_url,
        "api_key": api_key,
        "source": f"custom_provider:{custom_provider.get('name', requested_provider)}",
    }


def _resolve_openrouter_runtime(
    *,
    requested_provider: str,
    explicit_api_key: Optional[str] = None,
    explicit_base_url: Optional[str] = None,
) -> Dict[str, Any]:
    model_cfg = _get_model_config()
    cfg_base_url = model_cfg.get("base_url") if isinstance(model_cfg.get("base_url"), str) else ""
    cfg_provider = model_cfg.get("provider") if isinstance(model_cfg.get("provider"), str) else ""
    cfg_api_key = ""
    for k in ("api_key", "api"):
        v = model_cfg.get(k)
        if isinstance(v, str) and v.strip():
            cfg_api_key = v.strip()
            break
    requested_norm = (requested_provider or "").strip().lower()
    cfg_provider = cfg_provider.strip().lower()

    env_openai_base_url = os.getenv("OPENAI_BASE_URL", "").strip()
    env_openrouter_base_url = os.getenv("OPENROUTER_BASE_URL", "").strip()

    use_config_base_url = False
    if cfg_base_url.strip() and not explicit_base_url:
        if requested_norm == "auto":
            if (not cfg_provider or cfg_provider == "auto") and not env_openai_base_url:
                use_config_base_url = True
        elif requested_norm == "custom" and cfg_provider == "custom":
            # provider: custom — use base_url from config (Fixes #1760).
            use_config_base_url = True

    # When the user explicitly requested the openrouter provider, skip
    # OPENAI_BASE_URL — it typically points to a custom / non-OpenRouter
    # endpoint and would prevent switching back to OpenRouter (#874).
    skip_openai_base = requested_norm == "openrouter"

    # For custom, prefer config base_url over env so config.yaml is honored (#1760).
    base_url = (
        (explicit_base_url or "").strip()
        or (cfg_base_url.strip() if use_config_base_url else "")
        or ("" if skip_openai_base else env_openai_base_url)
        or env_openrouter_base_url
        or OPENROUTER_BASE_URL
    ).rstrip("/")

    # Choose API key based on whether the resolved base_url targets OpenRouter.
    # When hitting OpenRouter, prefer OPENROUTER_API_KEY (issue #289).
    # When hitting a custom endpoint (e.g. Z.ai, local LLM), prefer
    # OPENAI_API_KEY so the OpenRouter key doesn't leak to an unrelated
    # provider (issues #420, #560).
    _is_openrouter_url = "openrouter.ai" in base_url
    if _is_openrouter_url:
        api_key_candidates = [
            explicit_api_key,
            os.getenv("OPENROUTER_API_KEY"),
            os.getenv("OPENAI_API_KEY"),
        ]
    else:
        # Custom endpoint: use api_key from config when using config base_url (#1760).
        api_key_candidates = [
            explicit_api_key,
            (cfg_api_key if use_config_base_url else ""),
            os.getenv("OPENAI_API_KEY"),
            os.getenv("OPENROUTER_API_KEY"),
        ]
    api_key = next(
        (str(candidate or "").strip() for candidate in api_key_candidates if has_usable_secret(candidate)),
        "",
    )

    source = "explicit" if (explicit_api_key or explicit_base_url) else "env/config"

    # When "custom" was explicitly requested, preserve that as the provider
    # name instead of silently relabeling to "openrouter" (#2562).
    # Also provide a placeholder API key for local servers that don't require
    # authentication — the OpenAI SDK requires a non-empty api_key string.
    effective_provider = "custom" if requested_norm == "custom" else "openrouter"
    if effective_provider == "custom" and not api_key and not _is_openrouter_url:
        api_key = "no-key-required"

    return {
        "provider": effective_provider,
        "api_mode": _parse_api_mode(model_cfg.get("api_mode"))
        or _detect_api_mode_for_url(base_url)
        or "chat_completions",
        "base_url": base_url,
        "api_key": api_key,
        "source": source,
    }


def resolve_runtime_provider(
    *,
    requested: Optional[str] = None,
    explicit_api_key: Optional[str] = None,
    explicit_base_url: Optional[str] = None,
) -> Dict[str, Any]:
    """Resolve runtime provider credentials for agent execution."""
    requested_provider = resolve_requested_provider(requested)

    custom_runtime = _resolve_named_custom_runtime(
        requested_provider=requested_provider,
        explicit_api_key=explicit_api_key,
        explicit_base_url=explicit_base_url,
    )
    if custom_runtime:
        custom_runtime["requested_provider"] = requested_provider
        return custom_runtime

    provider = resolve_provider(
        requested_provider,
        explicit_api_key=explicit_api_key,
        explicit_base_url=explicit_base_url,
    )

    if provider == "nous":
        creds = resolve_nous_runtime_credentials(
            min_key_ttl_seconds=max(60, int(os.getenv("HERMES_NOUS_MIN_KEY_TTL_SECONDS", "1800"))),
            timeout_seconds=float(os.getenv("HERMES_NOUS_TIMEOUT_SECONDS", "15")),
        )
        return {
            "provider": "nous",
            "api_mode": "chat_completions",
            "base_url": creds.get("base_url", "").rstrip("/"),
            "api_key": creds.get("api_key", ""),
            "source": creds.get("source", "portal"),
            "expires_at": creds.get("expires_at"),
            "requested_provider": requested_provider,
        }

    if provider == "openai-codex":
        creds = resolve_codex_runtime_credentials()
        return {
            "provider": "openai-codex",
            "api_mode": "codex_responses",
            "base_url": creds.get("base_url", "").rstrip("/"),
            "api_key": creds.get("api_key", ""),
            "source": creds.get("source", "hermes-auth-store"),
            "last_refresh": creds.get("last_refresh"),
            "requested_provider": requested_provider,
        }

    if provider == "copilot-acp":
        creds = resolve_external_process_provider_credentials(provider)
        return {
            "provider": "copilot-acp",
            "api_mode": "chat_completions",
            "base_url": creds.get("base_url", "").rstrip("/"),
            "api_key": creds.get("api_key", ""),
            "command": creds.get("command", ""),
            "args": list(creds.get("args") or []),
            "source": creds.get("source", "process"),
            "requested_provider": requested_provider,
        }

    # Anthropic (native Messages API)
    if provider == "anthropic":
        from agent.anthropic_adapter import resolve_anthropic_token
        token = resolve_anthropic_token()
        if not token:
            raise AuthError(
                "No Anthropic credentials found. Set ANTHROPIC_TOKEN or ANTHROPIC_API_KEY, "
                "run 'claude setup-token', or authenticate with 'claude /login'."
            )
        # Allow base URL override from config.yaml model.base_url, but only
        # when the configured provider is anthropic — otherwise a non-Anthropic
        # base_url (e.g. Codex endpoint) would leak into Anthropic requests.
        model_cfg = _get_model_config()
        cfg_provider = str(model_cfg.get("provider") or "").strip().lower()
        cfg_base_url = ""
        if cfg_provider == "anthropic":
            cfg_base_url = (model_cfg.get("base_url") or "").strip().rstrip("/")
        base_url = cfg_base_url or "https://api.anthropic.com"
        return {
            "provider": "anthropic",
            "api_mode": "anthropic_messages",
            "base_url": base_url,
            "api_key": token,
            "source": "env",
            "requested_provider": requested_provider,
        }

    # API-key providers (z.ai/GLM, Kimi, MiniMax, MiniMax-CN)
    pconfig = PROVIDER_REGISTRY.get(provider)
    if pconfig and pconfig.auth_type == "api_key":
        creds = resolve_api_key_provider_credentials(provider)
        model_cfg = _get_model_config()
        base_url = creds.get("base_url", "").rstrip("/")
        api_mode = "chat_completions"
        if provider == "copilot":
            api_mode = _copilot_runtime_api_mode(model_cfg, creds.get("api_key", ""))
        else:
            # Check explicit api_mode from model config first
            configured_mode = _parse_api_mode(model_cfg.get("api_mode"))
            if configured_mode:
                api_mode = configured_mode
            # Auto-detect Anthropic-compatible endpoints by URL convention
            # (e.g. https://api.minimax.io/anthropic, https://dashscope.../anthropic)
            elif base_url.rstrip("/").endswith("/anthropic"):
                api_mode = "anthropic_messages"
            # MiniMax providers always use Anthropic Messages API.
            # Auto-correct stale /v1 URLs (from old .env or config) to /anthropic.
            elif provider in ("minimax", "minimax-cn"):
                api_mode = "anthropic_messages"
                if base_url.rstrip("/").endswith("/v1"):
                    base_url = base_url.rstrip("/")[:-3] + "/anthropic"
        return {
            "provider": provider,
            "api_mode": api_mode,
            "base_url": base_url,
            "api_key": creds.get("api_key", ""),
            "source": creds.get("source", "env"),
            "requested_provider": requested_provider,
        }

    runtime = _resolve_openrouter_runtime(
        requested_provider=requested_provider,
        explicit_api_key=explicit_api_key,
        explicit_base_url=explicit_base_url,
    )
    runtime["requested_provider"] = requested_provider
    return runtime


def format_runtime_provider_error(error: Exception) -> str:
    if isinstance(error, AuthError):
        return format_auth_error(error)
    return str(error)