"""工具注册表 - 工具系统重构 Phase 6.1"""

from collections import defaultdict
from typing import Any, Callable

from app.agents.tools.manifest import HookConfig, ToolManifest


class ToolRegistry:
    """工具注册表

    统一管理所有工具的注册、发现和调用。
    支持工具元数据、权限分类、Hook 拦截。
    """

    def __init__(self):
        self._tools: dict[str, ToolManifest] = {}
        self._executors: dict[str, Callable] = {}
        self._hooks: dict[str, list[HookConfig]] = defaultdict(list)

    def register(
        self, manifest: ToolManifest, executor: Callable, hooks: list[HookConfig] | None = None
    ) -> None:
        """注册工具

        Args:
            manifest: 工具元数据
            executor: 工具执行函数
            hooks: 可选的 Hook 配置列表
        """
        if manifest.name in self._tools:
            raise ValueError(f"Tool already registered: {manifest.name}")

        self._tools[manifest.name] = manifest
        self._executors[manifest.name] = executor

        if hooks:
            for hook in hooks:
                self._hooks[manifest.name].append(hook)

    def unregister(self, name: str) -> bool:
        """注销工具

        Args:
            name: 工具名称

        Returns:
            是否成功注销
        """
        if name not in self._tools:
            return False

        del self._tools[name]
        del self._executors[name]
        if name in self._hooks:
            del self._hooks[name]
        return True

    def get(self, name: str) -> ToolManifest | None:
        """获取工具元数据

        Args:
            name: 工具名称

        Returns:
            工具元数据，不存在返回 None
        """
        return self._tools.get(name)

    def get_executor(self, name: str) -> Callable | None:
        """获取工具执行器

        Args:
            name: 工具名称

        Returns:
            工具执行函数，不存在返回 None
        """
        return self._executors.get(name)

    def get_hooks(self, name: str) -> list[HookConfig]:
        """获取工具的 Hook 配置

        Args:
            name: 工具名称

        Returns:
            Hook 配置列表
        """
        return self._hooks.get(name, [])

    def list_all(self) -> list[ToolManifest]:
        """列出所有已注册的工具

        Returns:
            工具元数据列表
        """
        return list(self._tools.values())

    def list_by_category(self, category: Any) -> list[ToolManifest]:
        """按类别列出工具

        Args:
            category: 工具类别

        Returns:
            该类别下的所有工具
        """
        return [t for t in self._tools.values() if t.category == category]

    def list_by_permission(self, permission: Any) -> list[ToolManifest]:
        """按权限级别列出工具

        Args:
            permission: 权限级别

        Returns:
            该权限级别下的所有工具
        """
        return [t for t in self._tools.values() if t.permission_class == permission]

    def search_by_tag(self, tag: str) -> list[ToolManifest]:
        """按标签搜索工具

        Args:
            tag: 标签

        Returns:
            包含该标签的工具
        """
        return [t for t in self._tools.values() if tag in t.tags]

    def search_by_name(self, keyword: str) -> list[ToolManifest]:
        """按名称关键词搜索工具

        Args:
            keyword: 关键词

        Returns:
            名称包含关键词的工具
        """
        keyword = keyword.lower()
        return [t for t in self._tools.values() if keyword in t.name.lower()]

    def get_requires_confirmation(self, name: str) -> bool:
        """检查工具是否需要确认

        Args:
            name: 工具名称

        Returns:
            是否需要确认
        """
        manifest = self._tools.get(name)
        return manifest.requires_confirmation if manifest else False

    def get_is_streaming(self, name: str) -> bool:
        """检查工具是否支持流式执行

        Args:
            name: 工具名称

        Returns:
            是否支持流式
        """
        manifest = self._tools.get(name)
        return manifest.is_streaming if manifest else False

    def clear(self) -> None:
        """清空注册表"""
        self._tools.clear()
        self._executors.clear()
        self._hooks.clear()

    def __len__(self) -> int:
        return len(self._tools)

    def __contains__(self, name: str) -> bool:
        return name in self._tools

    def __iter__(self):
        return iter(self._tools.values())


# 全局单例实例
_global_registry: ToolRegistry | None = None


def get_tool_registry() -> ToolRegistry:
    """获取全局工具注册表单例

    Returns:
        全局 ToolRegistry 实例
    """
    global _global_registry
    if _global_registry is None:
        _global_registry = ToolRegistry()
    return _global_registry


def reset_tool_registry() -> None:
    """重置全局工具注册表（用于测试）"""
    global _global_registry
    if _global_registry is not None:
        _global_registry.clear()
    _global_registry = None