"""
title: OpenRouter Auto Router
author: OpenAI
version: 2.7.1
description: Автоматическая маршрутизация OpenRouter с поддержкой tools.
"""

import asyncio
import inspect
import json
import re

import httpx
from pydantic import BaseModel, Field


class Pipe:

    class Valves(BaseModel):
        """Настройки маршрутизатора OpenRouter."""

        OPENROUTER_API_KEY: str = Field(default="", description="API-ключ OpenRouter")
        BASE_URL: str = Field(
            default="https://openrouter.ai/api/v1/chat/completions",
            description="Endpoint Chat Completions OpenRouter",
        )

        DEFAULT_MODEL: str = Field(
            default="deepseek/deepseek-v4-flash",
            description="Модель для обычных запросов",
        )
        CODING_MODEL: str = Field(
            default="OpenAI: GPT-5.6 Luna",
            description="Модель для кода, Linux, Docker и Proxmox",
        )
        VISION_MODEL: str = Field(
            default="OpenAI: GPT-5.6 Luna",
            description="Модель для изображений и скриншотов",
        )
        COMPLEX_MODEL: str = Field(
            default="minimax/minimax-m3:floor",
            description="Модель для сложных задач",
        )

        SEND_TEMPERATURE: bool = Field(default=True, description="Передавать ли temperature модели")
        TEMPERATURE: float = Field(default=0.2, ge=0.0, le=2.0, description="Температура генерации")
        MAX_TOKENS: int = Field(default=0, ge=0, description="Лимит токенов. 0 — не переопределять")
        SHOW_ROUTER_INFO: bool = Field(default=True, description="Показывать выбранный маршрут и модель")
        REQUEST_TIMEOUT: int = Field(default=120, gt=0, le=600, description="Таймаут запроса в секундах")
        MAX_RETRIES: int = Field(default=2, ge=0, le=10, description="Повторы после сетевых ошибок и HTTP 429")

        ENABLE_TOOLS: bool = Field(default=True, description="Разрешить передачу и выполнение tools")
        SHOW_TOOL_TRACE: bool = Field(default=False, description="Показывать отладочную информацию о tools")
        MAX_TOOL_ITERATIONS: int = Field(default=10, ge=1, le=20, description="Максимум циклов tool calling")
        MAX_TOOL_RESULT_CHARS: int = Field(
            default=20000,
            ge=1000,
            le=200000,
            description="Максимальный размер результата одного инструмента",
        )

    def __init__(self):
        self.valves = self.Valves()

    def pipes(self):
        """Возвращает Pipe как виртуальную модель Open WebUI."""
        return [{"id": "auto-router", "name": "🤖 Auto Router — OpenRouter"}]

    def _has_image(self, messages):
        """Проверяет наличие изображения в сообщениях."""
        for message in messages:
            if not isinstance(message, dict):
                continue
            content = message.get("content")
            if not isinstance(content, list):
                continue
            for item in content:
                if not isinstance(item, dict):
                    continue
                if item.get("type") in {"image_url", "input_image"}:
                    return True
                if "image_url" in item or "image" in item:
                    return True
        return False

    def _extract_user_text(self, messages):
        """Извлекает текст последнего сообщения пользователя."""
        for message in reversed(messages):
            if not isinstance(message, dict) or message.get("role") != "user":
                continue
            content = message.get("content", "")
            if isinstance(content, str):
                return content
            if isinstance(content, list):
                return " ".join(
                    str(item.get("text", ""))
                    for item in content
                    if isinstance(item, dict)
                    and item.get("type") == "text"
                    and item.get("text")
                )
        return ""

    def _tokenize(self, text):
        """Разбивает текст на слова с поддержкой Unicode."""
        return set(re.findall(r"[^\W_]+", text.lower(), flags=re.UNICODE))

    def _contains_phrase(self, text, phrase):
        """Проверяет наличие фразы по границам слов."""
        return re.search(
            rf"(?<!\w){re.escape(phrase.lower())}(?!\w)",
            text,
            flags=re.UNICODE,
        ) is not None

    def _classify(self, text):
        """Определяет маршрут по ключевым словам."""
        text_lower = text.lower()
        words = self._tokenize(text_lower)

        complex_phrases = {
            "спроектируй", "разработай систему", "разработать систему",
            "архитектура системы", "рефакторинг проекта", "большой проект",
            "проанализируй проект", "анализ проекта", "сложная ошибка",
            "сложный баг", "несколько сервисов", "несколько контейнеров",
            "полная система", "систему с нуля", "проект с нуля",
            "приложение с нуля", "сервис с нуля", "интеграцию всех",
            "оптимизируй архитектуру", "system architecture", "system design",
            "large project", "large codebase", "refactor project",
            "refactor entire", "complex bug", "complex problem", "multi-agent",
            "multi service", "multiple services", "distributed system",
            "design a system", "build a system", "project from scratch",
            "system from scratch", "agentic",
        }

        if any(self._contains_phrase(text_lower, phrase) for phrase in complex_phrases):
            return "complex"
        if any(word.startswith("архитектур") for word in words):
            return "complex"

        coding_words = {
            "python", "javascript", "typescript", "java", "rust", "go", "php",
            "ruby", "kotlin", "swift", "html", "css", "react", "vue",
            "angular", "node", "nextjs", "код", "программа", "программирование",
            "скрипт", "функция", "класс", "метод", "библиотека", "api", "sdk",
            "алгоритм", "debug", "debugging", "ошибка", "баг", "bug", "traceback",
            "exception", "linux", "ubuntu", "debian", "centos", "fedora", "alpine",
            "bash", "shell", "zsh", "terminal", "systemctl", "journalctl", "apt",
            "yum", "dnf", "ssh", "sudo", "chmod", "chown", "cron", "docker",
            "dockerfile", "compose", "container", "контейнер", "контейнеры",
            "proxmox", "pve", "lxc", "pct", "qm", "nginx", "прокси", "firewall",
            "network", "сеть", "ip", "dns", "ssl", "tls", "сертификат",
            "postgresql", "postgres", "mysql", "mariadb", "redis", "mongodb", "sql",
            "yaml", "yml", "json", "toml", "git", "github", "gitlab", "commit", "branch",
            "gitea",
        }
        coding_stems = {"программ", "функци", "библиотек", "ошиб", "сертификат"}
        coding_phrases = {
            "c++", "c#", "docker-compose", "next.js", "написать код", "исправь код",
            "перепиши код", "рефакторинг", "stack trace", "error log",
            "виртуальная машина", "reverse proxy", "nginx proxy manager", "pull request",
        }

        if words.intersection(coding_words):
            return "coding"
        if any(word.startswith(stem) for word in words for stem in coding_stems):
            return "coding"
        if any(self._contains_phrase(text_lower, phrase) for phrase in coding_phrases):
            return "coding"
        return "default"

    def _select_model(self, messages, user_text):
        """Выбирает модель и тип маршрута."""
        if self._has_image(messages):
            return self.valves.VISION_MODEL, "vision"
        route = self._classify(user_text)
        if route == "complex":
            return self.valves.COMPLEX_MODEL, "complex"
        if route == "coding":
            return self.valves.CODING_MODEL, "coding"
        return self.valves.DEFAULT_MODEL, "default"

    async def _request(self, payload, client):
        """Отправляет запрос в OpenRouter с повторными попытками."""
        headers = {
            "Authorization": f"Bearer {self.valves.OPENROUTER_API_KEY.strip()}",
            "Content-Type": "application/json",
            "HTTP-Referer": "http://open-webui",
            "X-Title": "Open WebUI Auto Router",
        }
        last_error = None

        for attempt in range(self.valves.MAX_RETRIES + 1):
            try:
                response = await client.post(
                    self.valves.BASE_URL,
                    headers=headers,
                    json=payload,
                )
                if response.status_code == 429:
                    if attempt >= self.valves.MAX_RETRIES:
                        response.raise_for_status()
                    retry_after = response.headers.get("Retry-After")
                    try:
                        delay = float(retry_after)
                    except (TypeError, ValueError):
                        delay = 2 ** attempt
                    await asyncio.sleep(min(delay, 30))
                    continue

                response.raise_for_status()
                return response.json()

            except httpx.RequestError as exc:
                last_error = exc
                if attempt >= self.valves.MAX_RETRIES:
                    raise
                await asyncio.sleep(min(2 ** attempt, 30))

            except httpx.HTTPStatusError as exc:
                try:
                    detail = exc.response.text
                except Exception:
                    detail = str(exc)
                raise RuntimeError(
                    f"{exc.response.status_code}: {detail}"
                ) from exc

        if last_error:
            raise last_error
        raise RuntimeError("Request failed without a captured error")

    def _parse_tool_arguments(self, raw_arguments):
        """Разбирает JSON-аргументы вызова инструмента."""
        if raw_arguments is None:
            return {}
        if isinstance(raw_arguments, dict):
            return raw_arguments
        if not isinstance(raw_arguments, str):
            return None
        if not raw_arguments.strip():
            return {}
        try:
            arguments = json.loads(raw_arguments)
        except json.JSONDecodeError:
            return None
        return arguments if isinstance(arguments, dict) else None

    def _get_tool_callable(self, tool_entry):
        """Извлекает callable из поддерживаемых форматов __tools__."""
        if callable(tool_entry):
            return tool_entry
        if isinstance(tool_entry, dict):
            callable_fn = tool_entry.get("callable")
            if callable(callable_fn):
                return callable_fn
        return None

    def _get_tool_spec(self, tool_entry):
        """Извлекает schema инструмента из __tools__."""
        if not isinstance(tool_entry, dict):
            return None
        spec = tool_entry.get("spec")
        return spec if isinstance(spec, dict) else None

    def _extract_tool_specs(self, tools_map):
        """Собирает schema tools в OpenAI-compatible формате."""
        if not isinstance(tools_map, dict):
            return []

        specs = []
        for tool_entry in tools_map.values():
            spec = self._get_tool_spec(tool_entry)
            if not isinstance(spec, dict):
                continue

            if (
                spec.get("type") == "function"
                and isinstance(spec.get("function"), dict)
            ):
                specs.append(spec)
                continue

            name = spec.get("name")
            if not isinstance(name, str) or not name.strip():
                continue

            specs.append({"type": "function", "function": spec})

        return specs

    def _build_payload(self, body, model, messages, tools_map):
        """Собирает payload для запроса к OpenRouter."""
        payload = dict(body)
        payload["model"] = model
        payload["messages"] = messages
        payload["stream"] = False

        if self.valves.SEND_TEMPERATURE:
            payload["temperature"] = self.valves.TEMPERATURE
        if self.valves.MAX_TOKENS > 0:
            payload["max_tokens"] = self.valves.MAX_TOKENS

        for field in {"user", "reasoning_effort", "metadata", "store"}:
            payload.pop(field, None)

        if not self.valves.ENABLE_TOOLS:
            payload.pop("tools", None)
            payload.pop("tool_choice", None)
            payload.pop("parallel_tool_calls", None)
        elif not payload.get("tools"):
            tool_specs = self._extract_tool_specs(tools_map)
            if tool_specs:
                payload["tools"] = tool_specs

        return payload

    async def _run_tool_callable(self, callable_fn, arguments, name):
        """Вызывает sync/async callable и ограничивает результат."""
        try:
            result = callable_fn(**arguments)
            if inspect.isawaitable(result):
                result = await result
        except TypeError as exc:
            result = f"Ошибка вызова `{name}`: неверные аргументы ({exc})."
        except Exception as exc:
            result = f"Ошибка при выполнении инструмента `{name}`: {exc}"

        if isinstance(result, (dict, list)):
            try:
                result_text = json.dumps(result, ensure_ascii=False)
            except (TypeError, ValueError):
                result_text = str(result)
        else:
            result_text = str(result)

        if len(result_text) > self.valves.MAX_TOOL_RESULT_CHARS:
            result_text = (
                result_text[:self.valves.MAX_TOOL_RESULT_CHARS]
                + "\n\n[Результат инструмента обрезан]"
            )
        return result_text

    async def _execute_tool_call(self, tool_call, tools_map):
        """Выполняет tool call. Фатальна только ошибка tool_call_id."""
        if not isinstance(tool_call, dict):
            return {"fatal": True, "result": "Ошибка: некорректный формат tool call."}

        tool_call_id = tool_call.get("id")
        if not isinstance(tool_call_id, str) or not tool_call_id.strip():
            return {
                "fatal": True,
                "result": (
                    "Ошибка: модель вернула tool call без корректного "
                    "tool_call_id."
                ),
            }

        function = tool_call.get("function")
        if not isinstance(function, dict):
            return {
                "fatal": False,
                "tool_call_id": tool_call_id,
                "name": "unknown",
                "arguments": {},
                "result": "Ошибка: отсутствует описание функции.",
            }

        name = function.get("name")
        if not isinstance(name, str) or not name.strip():
            return {
                "fatal": False,
                "tool_call_id": tool_call_id,
                "name": "unknown",
                "arguments": {},
                "result": "Ошибка: tool call не содержит имени инструмента.",
            }

        arguments = self._parse_tool_arguments(function.get("arguments"))
        if arguments is None:
            return {
                "fatal": False,
                "tool_call_id": tool_call_id,
                "name": name,
                "arguments": {},
                "result": (
                    f"Ошибка: инструмент `{name}` получил некорректные "
                    "JSON-аргументы. Исправь их и повтори вызов."
                ),
            }

        if not isinstance(tools_map, dict):
            return {
                "fatal": False,
                "tool_call_id": tool_call_id,
                "name": name,
                "arguments": arguments,
                "result": f"Ошибка: инструмент `{name}` сейчас недоступен.",
            }

        callable_fn = self._get_tool_callable(tools_map.get(name))
        if callable_fn is None:
            return {
                "fatal": False,
                "tool_call_id": tool_call_id,
                "name": name,
                "arguments": arguments,
                "result": (
                    f"Ошибка: инструмент `{name}` не найден или "
                    "недоступен в текущем чате."
                ),
            }

        return {
            "fatal": False,
            "tool_call_id": tool_call_id,
            "name": name,
            "arguments": arguments,
            "result": await self._run_tool_callable(
                callable_fn, arguments, name
            ),
        }

    def _content_to_text(self, content):
        """Преобразует content сообщения в строку."""
        if isinstance(content, str):
            return content
        if isinstance(content, list):
            return "\n".join(
                str(item.get("text"))
                for item in content
                if isinstance(item, dict) and item.get("text")
            )
        if content is None:
            return ""
        return str(content)

    def _format_tool_trace(self, trace):
        """Форматирует историю вызовов инструментов."""
        blocks = []
        for index, item in enumerate(trace, start=1):
            blocks.append(
                f"### Инструмент {index}: `{item['name']}`\n\n"
                f"**Аргументы:**\n```json\n"
                f"{json.dumps(item['arguments'], ensure_ascii=False, indent=2)}\n"
                f"```\n\n**Результат:**\n```\n{item['result']}\n```"
            )
        return "\n\n".join(blocks)

    async def pipe(
        self,
        body: dict,
        __user__: dict = None,
        __tools__: dict = None,
    ):
        """Маршрутизирует запрос и выполняет цикл tool calling."""
        if not isinstance(body, dict):
            return "❌ **Некорректный формат запроса.**"

        if not self.valves.OPENROUTER_API_KEY.strip():
            return (
                "❌ **API-ключ OpenRouter не указан.**\n\n"
                "Откройте настройки Pipe → Valves и заполните "
                "`OPENROUTER_API_KEY`."
            )

        original_messages = body.get("messages", [])
        if not isinstance(original_messages, list):
            return "❌ **Поле `messages` должно быть списком.**"
        if not original_messages:
            return "❌ **Поле `messages` не должно быть пустым.**"

        tools_map = __tools__ if isinstance(__tools__, dict) else None
        user_text = self._extract_user_text(original_messages)
        model, route = self._select_model(original_messages, user_text)
        messages = list(original_messages)
        tool_trace = []
        final_content = ""
        stopped_reason = ""

        timeout = httpx.Timeout(self.valves.REQUEST_TIMEOUT)

        try:
            async with httpx.AsyncClient(timeout=timeout) as client:
                for _ in range(self.valves.MAX_TOOL_ITERATIONS):
                    payload = self._build_payload(
                        body, model, messages, tools_map
                    )
                    data = await self._request(payload, client)

                    try:
                        message = data["choices"][0]["message"]
                    except (KeyError, IndexError, TypeError):
                        return (
                            "❌ **OpenRouter вернул некорректный ответ.**\n\n"
                            f"`{data}`"
                        )

                    content_text = self._content_to_text(
                        message.get("content", "")
                    )
                    tool_calls = message.get("tool_calls") or []

                    if not isinstance(tool_calls, list):
                        return (
                            "❌ **OpenRouter вернул некорректный формат "
                            "`tool_calls`.**\n\n"
                            f"`{tool_calls}`"
                        )

                    if not tool_calls:
                        final_content = content_text
                        break

                    if not self.valves.ENABLE_TOOLS:
                        stopped_reason = (
                            "⚠️ Модель запросила инструмент, но tools "
                            "отключены в настройках Pipe."
                        )
                        final_content = content_text
                        break

                    if not tools_map:
                        stopped_reason = (
                            "⚠️ Модель запросила инструмент, но Open WebUI "
                            "не передал доступные функции в `__tools__`."
                        )
                        final_content = content_text
                        break

                    messages.append({
                        "role": "assistant",
                        "content": message.get("content"),
                        "tool_calls": tool_calls,
                    })

                    fatal_stop = False
                    for tool_call in tool_calls:
                        execution = await self._execute_tool_call(
                            tool_call, tools_map
                        )

                        if execution["fatal"]:
                            stopped_reason = execution["result"]
                            final_content = content_text
                            fatal_stop = True
                            break

                        tool_trace.append(execution)
                        messages.append({
                            "role": "tool",
                            "tool_call_id": execution["tool_call_id"],
                            "name": execution["name"],
                            "content": execution["result"],
                        })

                    if fatal_stop:
                        break
                else:
                    stopped_reason = (
                        "⚠️ Достигнут лимит циклов tool calling: "
                        f"{self.valves.MAX_TOOL_ITERATIONS}."
                    )

        except Exception as error:
            return (
                "❌ **Запрос к OpenRouter завершился ошибкой.**\n\n"
                f"Модель: `{model}`\n\n"
                f"Ошибка:\n`{error}`"
            )

        answer = final_content or ""
        if stopped_reason:
            answer = f"{answer}\n\n{stopped_reason}" if answer else stopped_reason

        if self.valves.SHOW_TOOL_TRACE and tool_trace:
            trace_text = self._format_tool_trace(tool_trace)
            answer = f"{answer}\n\n---\n\n{trace_text}" if answer else trace_text

        if not self.valves.SHOW_ROUTER_INFO:
            return answer

        route_names = {
            "default": "💰 Обычный запрос",
            "coding": "👨‍💻 Код / Linux / Docker",
            "vision": "🖼️ Изображение / скриншот",
            "complex": "🧠 Сложная задача",
        }
        route_name = route_names.get(route, route)

        return (
            f"**🤖 Auto Router**  \n"
            f"Маршрут: **{route_name}**  \n"
            f"Модель: `{model}`\n\n"
            f"{answer}"
        )