"""
Vision tool - Analyze images using Vision API.
Supports local files (auto base64-encoded) and HTTP URLs.

Provider resolution:
  - tools.vision.model (if set) means "prefer this model first; fall back to
    other configured providers if it fails". The model name is mapped to its
    native provider (e.g. doubao-* → Doubao, kimi-* → Moonshot, gpt-* →
    OpenAI/LinkAI). That provider is tried first, then the standard auto
    chain runs as fallback (with the preferred provider de-duplicated).
  - Auto chain priority:
      1. Main model via bot.call_vision — only when the main bot is known
         to actually support vision (not just expose a call_vision method).
      2. Other models whose API key is configured.
      3. OpenAI / LinkAI raw HTTP.
    When use_linkai=true, LinkAI is promoted to #1.
"""

import base64
import os
import subprocess
import tempfile
from dataclasses import dataclass, field
from typing import Any, Dict, List, Optional

import requests

from agent.tools.base_tool import BaseTool, ToolResult
from agent.tools.utils.url_safety import validate_url_safe
from common import const
from common.log import logger
from config import conf

DEFAULT_MODEL = const.GPT_41_MINI
DEFAULT_TIMEOUT = 180
MAX_TOKENS = 4000
COMPRESS_THRESHOLD = 1_048_576  # 1 MB

SUPPORTED_EXTENSIONS = {
    "jpg": "image/jpeg",
    "jpeg": "image/jpeg",
    "png": "image/png",
    "gif": "image/gif",
    "webp": "image/webp",
}

_MAIN_MODEL_PROVIDER_NAME = "MainModel"

# (config_key_for_api_key, bot_type, default_vision_model, provider_display_name)
# Auto-discovered as fallback vision providers when their API key is configured.
# OpenAI and LinkAI are handled separately (raw HTTP providers), so not listed here.
_DISCOVERABLE_MODELS = [
    ("moonshot_api_key", const.MOONSHOT, const.KIMI_K2_6, "Moonshot"),
    ("ark_api_key", const.DOUBAO, const.DOUBAO_SEED_2_PRO, "Doubao"),
    ("dashscope_api_key", const.QWEN_DASHSCOPE, const.QWEN37_PLUS, "DashScope"),
    ("claude_api_key", const.CLAUDEAPI, const.CLAUDE_SONNET_5, "Claude"),
    ("gemini_api_key", const.GEMINI, const.GEMINI_35_FLASH, "Gemini"),
    ("qianfan_api_key", const.QIANFAN, const.ERNIE_45_TURBO_VL, "Qianfan"),
    ("zhipu_ai_api_key", const.ZHIPU_AI, const.GLM_4_7, "ZhipuAI"),
    ("minimax_api_key", const.MiniMax, const.MINIMAX_M2_7, "MiniMax"),
    ("mimo_api_key", const.MIMO, const.MIMO_V2_5_PRO, "MiMo"),
]

# Model name prefix → discoverable provider display_name.
# Used to auto-route tools.vision.model to its native provider.
# Matched case-insensitively; longest prefix wins.
_MODEL_PREFIX_TO_PROVIDER = [
    ("doubao-", "Doubao"),
    ("kimi-", "Moonshot"),
    ("moonshot-", "Moonshot"),
    ("qwen", "DashScope"),       # qwen-*, qwen3-*, qwen3.6-*, etc.
    ("claude-", "Claude"),
    ("ernie-", "Qianfan"),
    ("gemini-", "Gemini"),
    ("glm-", "ZhipuAI"),
    ("minimax-", "MiniMax"),
    ("abab", "MiniMax"),
    ("mimo-", "MiMo"),
]

# Model prefixes that natively belong to OpenAI / LinkAI (raw HTTP providers).
_OPENAI_MODEL_PREFIXES = ("gpt-", "o1-", "o3-", "o4-", "chatgpt-")

# Maps the UI provider id (persisted in tools.vision.provider) to the internal
# display name used in VisionProvider.name. Keep in sync with _DISCOVERABLE_MODELS
# and the openai/linkai branches in _route_by_model_name.
_PROVIDER_ID_TO_DISPLAY = {
    "openai": "OpenAI",
    "linkai": "LinkAI",
    "moonshot": "Moonshot",
    "doubao": "Doubao",
    "dashscope": "DashScope",
    "claudeAPI": "Claude",
    "gemini": "Gemini",
    "qianfan": "Qianfan",
    "zhipu": "ZhipuAI",
    "minimax": "MiniMax",
    "mimo": "MiMo",
}


@dataclass
class VisionProvider:
    """A single Vision API provider configuration."""
    name: str
    api_key: str
    api_base: str
    extra_headers: dict = field(default_factory=dict)
    model_override: Optional[str] = None
    use_bot: bool = False  # When True, call via bot.call_vision instead of raw HTTP
    fallback_bot: Any = None  # Bot instance for non-main-model providers


class VisionAPIError(Exception):
    """Raised when a Vision API call fails and should trigger fallback."""
    pass


class Vision(BaseTool):
    """Analyze images using Vision API"""

    name: str = "vision"
    description: str = (
        "Analyze a local image or image URL (jpg/jpeg/png) using Vision API. "
        "Can describe content, extract text, identify objects, colors, etc. "
    )

    params: dict = {
        "type": "object",
        "properties": {
            "image": {
                "type": "string",
                "description": "Local file path or HTTP(S) URL of the image to analyze",
            },
            "question": {
                "type": "string",
                "description": "Question to ask about the image",
            },
        },
        "required": ["image", "question"],
    }

    def __init__(self, config: dict = None):
        self.config = config or {}

    @staticmethod
    def is_available() -> bool:
        return True

    def execute(self, args: Dict[str, Any]) -> ToolResult:
        image = args.get("image", "").strip()
        question = args.get("question", "").strip()

        if not image:
            return ToolResult.fail("Error: 'image' parameter is required")
        if not question:
            return ToolResult.fail("Error: 'question' parameter is required")

        providers = self._resolve_providers()
        if not providers:
            return ToolResult.fail(
                "Error: No model available for Vision.\n"
                "The main model does not support vision and no other API keys are configured.\n"
                "Options:\n"
                "  1. Switch to a multimodal model (e.g. claude-sonnet-5, qwen3.7-plus, gemini-2.0-flash, ernie-4.5-turbo-vl)\n"
                "  2. Configure OPENAI_API_KEY: env_config(action=\"set\", key=\"OPENAI_API_KEY\", value=\"your-key\")\n"
                "  3. Configure LINKAI_API_KEY: env_config(action=\"set\", key=\"LINKAI_API_KEY\", value=\"your-key\")"
            )

        try:
            image_content = self._build_image_content(image)
        except Exception as e:
            return ToolResult.fail(f"Error: {e}")

        # Default model is only used as a last-resort placeholder for providers
        # whose VisionProvider.model_override is None (e.g. raw OpenAI provider
        # when the user did not configure tools.vision.model).
        return self._call_with_fallback(providers, DEFAULT_MODEL, question, image_content)

    def _call_with_fallback(self, providers: List[VisionProvider], model: str,
                            question: str, image_content: dict) -> ToolResult:
        """Try each provider in order; fall back to the next one on failure."""
        errors: List[str] = []
        for i, provider in enumerate(providers):
            use_model = provider.model_override or model
            try:
                logger.info(f"[Vision] Trying provider '{provider.name}' "
                            f"with model '{use_model}' ({i + 1}/{len(providers)})")
                if provider.use_bot:
                    result = self._call_via_bot(use_model, question, image_content, provider)
                else:
                    result = self._call_api(provider, use_model, question, image_content)
                logger.info(f"[Vision] ✅ Success via {provider.name} (model={use_model})")
                return result
            except VisionAPIError as e:
                errors.append(f"[{provider.name}/{use_model}] {e}")
                logger.warning(f"[Vision] Provider '{provider.name}' failed: {e}")
            except requests.Timeout:
                errors.append(f"[{provider.name}/{use_model}] Request timed out after {DEFAULT_TIMEOUT}s")
                logger.warning(f"[Vision] Provider '{provider.name}' timed out")
            except requests.ConnectionError:
                errors.append(f"[{provider.name}/{use_model}] Connection failed")
                logger.warning(f"[Vision] Provider '{provider.name}' connection failed")
            except Exception as e:
                errors.append(f"[{provider.name}/{use_model}] {e}")
                logger.error(f"[Vision] Provider '{provider.name}' unexpected error: {e}", exc_info=True)

        return ToolResult.fail(
            "Error: All Vision API providers failed.\n" + "\n".join(f"  - {err}" for err in errors)
        )

    def _resolve_providers(self) -> List[VisionProvider]:
        """
        Build an ordered list of providers to try.

        Semantics of `tools.vision.model`:
          "Prefer this model first; fall back to other configured providers
           if it fails."

        Order:
          1. The provider that natively serves `tools.vision.model` (if any
             and its API key is configured) — using the user-specified model
             name verbatim.
          2. Auto-discovery chain as fallback:
               - use_linkai=true → [LinkAI, MainModel?, OtherModels…, OpenAI]
               - default         → [MainModel?, OtherModels…, OpenAI, LinkAI]
             MainModel is only included when the main bot is known to support
             vision (see _main_bot_supports_vision).

        Providers that share the same display name as the preferred provider
        are de-duplicated to avoid retrying the same endpoint twice.
        """
        user_model = self._resolve_user_vision_model()
        user_provider = self._resolve_user_vision_provider()
        providers: List[VisionProvider] = []

        # Step 1: preferred provider — explicit `tools.vision.provider`
        # wins so custom model names can still be routed correctly. Falls
        # through to model-name prefix inference when provider is unset.
        preferred = None
        if user_provider and user_model:
            preferred = self._route_by_provider_id(user_provider, user_model)
        if not preferred and user_model:
            preferred = self._route_by_model_name(user_model)
        if preferred:
            providers.extend(preferred)

        # Step 2: auto-discovery chain as fallback
        existing = {p.name for p in providers}
        fallback: List[VisionProvider] = []
        use_linkai = conf().get("use_linkai", False) and conf().get("linkai_api_key")

        if use_linkai:
            self._append_provider(fallback, lambda: self._build_linkai_provider(user_model))
            self._append_provider(fallback, self._build_main_model_provider)
            self._append_other_model_providers(fallback, preferred_model=user_model)
            self._append_provider(fallback, lambda: self._build_openai_provider(user_model))
        else:
            self._append_provider(fallback, self._build_main_model_provider)
            self._append_other_model_providers(fallback, preferred_model=user_model)
            self._append_provider(fallback, lambda: self._build_openai_provider(user_model))
            self._append_provider(fallback, lambda: self._build_linkai_provider(user_model))

        for p in fallback:
            if p.name in existing:
                continue
            providers.append(p)
            existing.add(p.name)

        return providers

    @staticmethod
    def _append_provider(providers: List[VisionProvider], builder) -> None:
        p = builder()
        if p:
            providers.append(p)

    @staticmethod
    def _resolve_user_vision_model() -> Optional[str]:
        """Read tools.vision.model (singular ``tool`` kept as runtime fallback)."""
        tools_conf = conf().get("tools") or conf().get("tool") or {}
        if not isinstance(tools_conf, dict):
            return None
        vision_conf = tools_conf.get("vision", {})
        if not isinstance(vision_conf, dict):
            return None
        m = vision_conf.get("model")
        if isinstance(m, str) and m.strip():
            return m.strip()
        return None

    @staticmethod
    def _resolve_user_vision_provider() -> Optional[str]:
        """Read tools.vision.provider — the UI-persisted vendor id.

        Lets users pin a vendor for custom model names that prefix-inference
        can't recognize. Returns None when unset/blank.
        """
        tools_conf = conf().get("tools") or conf().get("tool") or {}
        if not isinstance(tools_conf, dict):
            return None
        vision_conf = tools_conf.get("vision", {})
        if not isinstance(vision_conf, dict):
            return None
        p = vision_conf.get("provider")
        if isinstance(p, str) and p.strip():
            return p.strip()
        return None

    @staticmethod
    def _infer_provider_from_model(model_name: str) -> Optional[str]:
        """
        Infer the provider display name from a model name's prefix.
        Returns None when no rule matches (or for OpenAI-family names, which
        are handled separately by the caller).
        """
        if not model_name:
            return None
        lower = model_name.lower()
        # Sort by prefix length desc so e.g. "moonshot-" wins over hypothetical "moo-"
        for prefix, display_name in sorted(_MODEL_PREFIX_TO_PROVIDER, key=lambda x: -len(x[0])):
            if lower.startswith(prefix.lower()):
                return display_name
        return None

    def _route_by_provider_id(self, provider_id: str, user_model: str) -> Optional[List[VisionProvider]]:
        """Route by the UI-persisted provider id.

        Returns:
          - [provider] : provider id is known and its key is configured.
          - None       : unknown provider id, or the bot can't be created.
                         Caller falls through to model-name-based routing.
        """
        # Custom OpenAI-compatible providers — read credentials from
        # custom_providers list, same pattern as embedding.
        if provider_id.startswith("custom:"):
            p = self._build_custom_provider(provider_id, user_model)
            return [p] if p else None

        display_name = _PROVIDER_ID_TO_DISPLAY.get(provider_id)
        if not display_name:
            return None

        # OpenAI / LinkAI use raw HTTP providers, not the discoverable bot path.
        if provider_id == "openai":
            p = self._build_openai_provider(user_model)
            return [p] if p else None
        if provider_id == "linkai":
            p = self._build_linkai_provider(user_model)
            return [p] if p else None

        # Discoverable bot-backed providers.
        for config_key, bot_type, _default_model, name in _DISCOVERABLE_MODELS:
            if name != display_name:
                continue
            api_key = conf().get(config_key, "")
            if not api_key or not api_key.strip():
                logger.warning(f"[Vision] tools.vision.provider='{provider_id}' "
                               f"but '{config_key}' is not configured. Falling back.")
                return None
            try:
                from models.bot_factory import create_bot
                bot = create_bot(bot_type)
                if not hasattr(bot, 'call_vision'):
                    logger.warning(f"[Vision] '{display_name}' bot does not implement call_vision.")
                    return None
            except Exception as e:
                logger.warning(f"[Vision] Failed to create '{display_name}' bot: {e}")
                return None
            return [VisionProvider(
                name=display_name,
                api_key="",
                api_base="",
                model_override=user_model,
                use_bot=True,
                fallback_bot=bot,
            )]
        return None

    def _route_by_model_name(self, user_model: str) -> Optional[List[VisionProvider]]:
        """
        Try to build a provider list using the user-specified model name.
        Returns:
          - [provider]  : matched and the provider's key is configured
          - []          : matched but key missing → tell caller to surface this
                          as a hard error rather than silently falling back
          - None        : no rule matches → caller should fall through to auto
        """
        lower = user_model.lower()

        # OpenAI / LinkAI family
        if lower.startswith(_OPENAI_MODEL_PREFIXES):
            providers: List[VisionProvider] = []
            # Prefer LinkAI when explicitly enabled, else OpenAI first
            use_linkai = conf().get("use_linkai", False) and conf().get("linkai_api_key")
            if use_linkai:
                self._append_provider(providers, lambda: self._build_linkai_provider(user_model))
                self._append_provider(providers, lambda: self._build_openai_provider(user_model))
            else:
                self._append_provider(providers, lambda: self._build_openai_provider(user_model))
                self._append_provider(providers, lambda: self._build_linkai_provider(user_model))
            if providers:
                return providers
            logger.warning(f"[Vision] tools.vision.model='{user_model}' looks like an OpenAI "
                           f"model but neither OPENAI_API_KEY nor LINKAI_API_KEY is configured.")
            return None  # fall through to auto

        # Discoverable native providers (Doubao, Moonshot, etc.)
        target_display = self._infer_provider_from_model(user_model)
        if not target_display:
            return None  # unknown prefix → auto

        for config_key, bot_type, _default_model, display_name in _DISCOVERABLE_MODELS:
            if display_name != target_display:
                continue
            api_key = conf().get(config_key, "")
            if not api_key or not api_key.strip():
                logger.warning(f"[Vision] tools.vision.model='{user_model}' routes to "
                               f"'{display_name}' but '{config_key}' is not configured. "
                               f"Falling back to auto-discovery.")
                return None  # fall through to auto
            try:
                from models.bot_factory import create_bot
                bot = create_bot(bot_type)
                if not hasattr(bot, 'call_vision'):
                    logger.warning(f"[Vision] '{display_name}' bot does not implement call_vision.")
                    return None
            except Exception as e:
                logger.warning(f"[Vision] Failed to create '{display_name}' bot: {e}")
                return None

            return [VisionProvider(
                name=display_name,
                api_key="",
                api_base="",
                model_override=user_model,
                use_bot=True,
                fallback_bot=bot,
            )]

        return None

    def _append_other_model_providers(self, providers: List[VisionProvider],
                                       preferred_model: Optional[str] = None) -> None:
        """
        Auto-discover other models whose API key is configured.
        Skip the main model's own bot_type (already covered by MainModel
        provider), unless the main model itself does not support vision —
        in that case we still want the vendor's dedicated vision model
        as a fallback. Also skip bot_types that already appear in the
        provider list.

        If preferred_model matches a provider's family, use it instead
        of that provider's hard-coded default model.
        """
        main_bot_type = None
        main_bot_supports_vision = False
        if self.model and hasattr(self.model, '_resolve_bot_type'):
            main_bot_type = self.model._resolve_bot_type(conf().get("model", ""))
            main_bot = getattr(self.model, "bot", None)
            main_bot_supports_vision = self._main_bot_supports_vision(main_bot)

        existing_names = {p.name for p in providers}
        preferred_provider = self._infer_provider_from_model(preferred_model) if preferred_model else None

        for config_key, bot_type, default_model, display_name in _DISCOVERABLE_MODELS:
            if display_name in existing_names:
                continue
            # Same bot_type as the main model is normally handled by the
            # MainModel provider; only skip it here if the main model
            # actually supports vision. Otherwise fall through and add
            # the vendor's dedicated vision model as a fallback.
            if bot_type == main_bot_type and main_bot_supports_vision:
                continue
            api_key = conf().get(config_key, "")
            if not api_key or not api_key.strip():
                continue

            try:
                from models.bot_factory import create_bot
                bot = create_bot(bot_type)
                if not hasattr(bot, 'call_vision'):
                    continue
            except Exception:
                continue

            model_for_provider = (preferred_model
                                  if preferred_provider == display_name and preferred_model
                                  else default_model)

            provider = VisionProvider(
                name=display_name,
                api_key="",
                api_base="",
                model_override=model_for_provider,
                use_bot=True,
                fallback_bot=bot,
            )

            # Same vendor as the main bot is the most natural fallback when
            # the main model itself does not support vision — promote it to
            # the front of the list instead of relying on declaration order.
            if bot_type == main_bot_type:
                providers.insert(0, provider)
            else:
                providers.append(provider)

    def _main_bot_supports_vision(self, bot) -> bool:
        """
        Whether the main bot is known to natively support vision.

        Having a `call_vision` method is necessary but not sufficient —
        some bots implement the method against an endpoint that does not
        actually serve vision models, which causes silent failures when a
        vendor-foreign model name is forwarded.

        Resolution order:
          1. If the bot explicitly declares `supports_vision`, trust it.
             This lets bots opt in or out based on their own runtime
             configuration (e.g. the currently selected model).
          2. Otherwise, fall back to a model-name prefix heuristic: trust
             call_vision when the main model looks like an OpenAI family
             model or matches a known multimodal vendor prefix.
        """
        if bot is None:
            return False
        if hasattr(bot, "supports_vision"):
            return bool(getattr(bot, "supports_vision"))
        main_model = (conf().get("model") or "").lower()
        if not main_model:
            return False
        if main_model.startswith(_OPENAI_MODEL_PREFIXES):
            return True
        return self._infer_provider_from_model(main_model) is not None

    def _build_main_model_provider(self) -> Optional[VisionProvider]:
        """
        Use the vendor's own model for vision via bot.call_vision.
        Gated by _main_bot_supports_vision so non-vision bots (DeepSeek, etc.)
        do not get routed vendor-foreign model names.
        """
        if not (self.model and hasattr(self.model, 'bot')):
            return None
        try:
            bot = self.model.bot
        except Exception:
            return None
        if not hasattr(bot, 'call_vision'):
            return None
        if not self._main_bot_supports_vision(bot):
            return None

        # Use the configured main model name; do NOT inject tools.vision.model
        # here, because by the time we reach this branch the tools.vision.model
        # routing has already been attempted (and either matched the main bot
        # or failed to find a provider).
        main_model_name = conf().get("model") or None

        return VisionProvider(
            name=_MAIN_MODEL_PROVIDER_NAME,
            api_key="",
            api_base="",
            model_override=main_model_name,
            use_bot=True,
        )

    def _build_openai_provider(self, preferred_model: Optional[str] = None) -> Optional[VisionProvider]:
        api_key = conf().get("open_ai_api_key") or os.environ.get("OPENAI_API_KEY")
        if not api_key:
            return None
        api_base = (conf().get("open_ai_api_base") or os.environ.get("OPENAI_API_BASE", "")).rstrip("/") \
            or "https://api.openai.com/v1"
        # Only honor preferred_model when it looks like an OpenAI-family name;
        # otherwise the OpenAI endpoint would 400 on a vendor-specific name.
        model_override = preferred_model if (
            preferred_model and preferred_model.lower().startswith(_OPENAI_MODEL_PREFIXES)
        ) else None
        return VisionProvider(
            name="OpenAI",
            api_key=api_key,
            api_base=self._ensure_v1(api_base),
            model_override=model_override,
        )

    def _build_linkai_provider(self, preferred_model: Optional[str] = None) -> Optional[VisionProvider]:
        api_key = conf().get("linkai_api_key") or os.environ.get("LINKAI_API_KEY")
        if not api_key:
            return None
        api_base = (conf().get("linkai_api_base") or os.environ.get("LINKAI_API_BASE", "")).rstrip("/") \
            or "https://api.link-ai.tech"
        from common.utils import get_cloud_headers
        extra = get_cloud_headers(api_key)
        extra.pop("Authorization", None)
        extra.pop("Content-Type", None)
        # LinkAI is a multi-vendor proxy and accepts most model names, so we
        # honor any user-configured model name here.
        return VisionProvider(
            name="LinkAI",
            api_key=api_key,
            api_base=self._ensure_v1(api_base),
            extra_headers=extra,
            model_override=preferred_model,
        )

    def _build_custom_provider(self, provider_id: str, preferred_model: Optional[str] = None) -> Optional[VisionProvider]:
        """Build a VisionProvider from a custom:<id> entry in custom_providers.
        Uses the standard OpenAI /chat/completions endpoint — any
        OpenAI-compatible multimodal endpoint works."""
        from models.custom_provider import parse_custom_bot_type, get_custom_providers, _find_provider_by_id
        _, custom_id = parse_custom_bot_type(provider_id)
        if not custom_id:
            return None
        entry = _find_provider_by_id(get_custom_providers(), custom_id)
        if not entry:
            logger.warning(f"[Vision] custom provider '{provider_id}' not found in custom_providers")
            return None
        api_key = (entry.get("api_key") or "").strip()
        api_base = (entry.get("api_base") or "").strip()
        if not api_key or not api_base:
            logger.warning(f"[Vision] custom provider '{provider_id}' missing api_key or api_base")
            return None
        model = preferred_model or entry.get("model") or ""
        if not model:
            logger.warning(f"[Vision] custom provider '{provider_id}' has no model configured")
            return None
        return VisionProvider(
            name=entry.get("name") or provider_id,
            api_key=api_key,
            api_base=self._ensure_v1(api_base.rstrip("/")),
            model_override=model,
        )

    def _call_via_bot(self, model: str, question: str, image_content: dict,
                      provider: Optional[VisionProvider] = None) -> ToolResult:
        """
        Call a model's call_vision with vendor-native API format.
        Uses the provider's _fallback_bot if set, otherwise the main model bot.
        Raises VisionAPIError on failure so fallback can proceed.
        """
        try:
            bot = (provider and provider.fallback_bot) or self.model.bot
        except Exception as e:
            raise VisionAPIError(f"Cannot access bot: {e}")

        # Extract the raw image URL from the OpenAI-format image_content block
        image_url = image_content.get("image_url", {}).get("url", "")
        if not image_url:
            raise VisionAPIError("No image URL in content block")

        try:
            response = bot.call_vision(
                image_url=image_url,
                question=question,
                model=model,
                max_tokens=MAX_TOKENS,
            )
        except Exception as e:
            raise VisionAPIError(f"call_vision failed: {e}")

        if response is NotImplemented:
            raise VisionAPIError("Bot does not support vision")

        if isinstance(response, dict) and response.get("error"):
            raise VisionAPIError(f"API error - {response.get('message', 'Unknown')}")

        content = response.get("content", "") if isinstance(response, dict) else ""
        if not content:
            raise VisionAPIError("Empty response from main model")

        usage_info = response.get("usage", {}) if isinstance(response, dict) else {}

        # Use the actual model name from the bot response if available
        actual_model = response.get("model", model) if isinstance(response, dict) else model
        provider_name = provider.name if provider else _MAIN_MODEL_PROVIDER_NAME
        return ToolResult.success({
            "model": actual_model,
            "provider": provider_name,
            "content": content,
            "usage": usage_info,
        })

    @staticmethod
    def _ensure_v1(api_base: str) -> str:
        """Append /v1 if the base URL doesn't already end with a versioned path."""
        if not api_base:
            return api_base
        # Already has /v1 or similar version suffix
        if api_base.rstrip("/").split("/")[-1].startswith("v"):
            return api_base
        return api_base.rstrip("/") + "/v1"

    @staticmethod
    def _validate_url_safe(url: str) -> None:
        """Reject URLs that target private/loopback/link-local addresses (SSRF guard).

        Resolves the hostname to its IP address(es) and blocks any that fall
        into non-public ranges.  Also rejects URLs with no host, non-HTTP(S)
        schemes, or hosts that fail DNS resolution.

        Delegates to the shared ``agent.tools.utils.url_safety`` helper so the
        same guard protects every tool that fetches model-supplied URLs.

        Raises:
            ValueError: if the URL targets a disallowed address.
        """
        validate_url_safe(url)

    def _build_image_content(self, image: str) -> dict:
        """
        Build the image_url content block.
        Both remote URLs and local files are converted to base64 data URLs
        so every bot backend can consume them without extra downloads.
        """
        if image.startswith(("http://", "https://")):
            self._validate_url_safe(image)
            return self._download_to_data_url(image)

        if not os.path.isfile(image):
            raise FileNotFoundError(f"Image file not found: {image}")

        ext = image.rsplit(".", 1)[-1].lower() if "." in image else ""
        mime_type = SUPPORTED_EXTENSIONS.get(ext)
        if not mime_type:
            raise ValueError(
                f"Unsupported image format '.{ext}'. "
                f"Supported: {', '.join(SUPPORTED_EXTENSIONS.keys())}"
            )

        file_path = self._maybe_compress(image)
        try:
            with open(file_path, "rb") as f:
                b64 = base64.b64encode(f.read()).decode("ascii")
        finally:
            if file_path != image and os.path.exists(file_path):
                os.remove(file_path)

        data_url = f"data:{mime_type};base64,{b64}"
        return {"type": "image_url", "image_url": {"url": data_url}}

    @staticmethod
    def _download_to_data_url(url: str) -> dict:
        """Download a remote image and return it as a base64 data URL."""
        resp = requests.get(url, timeout=30)
        if resp.status_code != 200:
            raise VisionAPIError(f"Failed to download image: HTTP {resp.status_code}")
        content_type = resp.headers.get("Content-Type", "image/jpeg").split(";")[0].strip()
        if not content_type.startswith("image/"):
            content_type = "image/jpeg"
        b64 = base64.b64encode(resp.content).decode("ascii")
        data_url = f"data:{content_type};base64,{b64}"
        return {"type": "image_url", "image_url": {"url": data_url}}

    @staticmethod
    def _maybe_compress(path: str) -> str:
        """Compress image to under COMPRESS_THRESHOLD with max long-edge 1536px."""
        file_size = os.path.getsize(path)
        if file_size <= COMPRESS_THRESHOLD:
            return path

        tmp = tempfile.NamedTemporaryFile(suffix=".jpg", delete=False)
        tmp.close()

        def _try_sips(max_dim: str, quality: str) -> bool:
            try:
                subprocess.run(
                    ["sips", "-Z", max_dim, "-s", "formatOptions", quality,
                     path, "--out", tmp.name],
                    capture_output=True, check=True,
                )
                return True
            except (FileNotFoundError, subprocess.CalledProcessError):
                return False

        def _try_convert(max_dim: str, quality: str) -> bool:
            try:
                subprocess.run(
                    ["convert", path, "-resize", f"{max_dim}x{max_dim}>",
                     "-quality", quality, tmp.name],
                    capture_output=True, check=True,
                )
                return True
            except (FileNotFoundError, subprocess.CalledProcessError):
                return False

        attempts = [
            ("1536", "85"),
            ("1536", "70"),
            ("1536", "50"),
        ]

        for max_dim, quality in attempts:
            ok = _try_sips(max_dim, quality) or _try_convert(max_dim, quality)
            if not ok:
                continue
            new_size = os.path.getsize(tmp.name)
            logger.debug(f"[Vision] Compressed image "
                         f"({file_size // 1024}KB -> {new_size // 1024}KB, "
                         f"max_dim={max_dim}, q={quality})")
            if new_size <= COMPRESS_THRESHOLD:
                return tmp.name

        if os.path.exists(tmp.name) and os.path.getsize(tmp.name) > 0:
            return tmp.name

        os.remove(tmp.name)
        return path

    def _call_api(self, provider: VisionProvider, model: str,
                  question: str, image_content: dict) -> ToolResult:
        """
        Call a single provider's Vision API.
        Raises VisionAPIError on recoverable failures so the caller can try
        the next provider.
        """
        payload = {
            "model": model,
            "messages": [
                {
                    "role": "user",
                    "content": [
                        {"type": "text", "text": question},
                        image_content,
                    ],
                }
            ],
        }

        headers = {
            "Authorization": f"Bearer {provider.api_key}",
            "Content-Type": "application/json",
            **provider.extra_headers,
        }

        resp = requests.post(
            f"{provider.api_base}/chat/completions",
            headers=headers,
            json=payload,
            timeout=DEFAULT_TIMEOUT,
        )

        if resp.status_code != 200:
            raise VisionAPIError(f"HTTP {resp.status_code}: {resp.text[:200]}")

        data = resp.json()

        if "error" in data:
            msg = data["error"].get("message", "Unknown API error")
            raise VisionAPIError(f"API error - {msg}")

        content = ""
        choices = data.get("choices", [])
        if choices:
            content = choices[0].get("message", {}).get("content", "")

        usage = data.get("usage", {})
        result = {
            "model": model,
            "provider": provider.name,
            "content": content,
            "usage": {
                "prompt_tokens": usage.get("prompt_tokens", 0),
                "completion_tokens": usage.get("completion_tokens", 0),
                "total_tokens": usage.get("total_tokens", 0),
            },
        }
        return ToolResult.success(result)
