"""Hook 管理器 - Phase 6.2

管理 Hook 的注册、查找和配置。
"""

from typing import Any

from app.agents.tools.hooks.types import (
    HookDefinition,
    HookResult,
    HookTrigger,
    HookType,
    ExecutionContext,
)


class HookManager:
    """Hook 管理器

    管理全局 Hook 的注册和配置。
    """

    def __init__(self):
        self._hooks: dict[HookType, list[HookDefinition]] = {
            HookType.PRE_TOOL_USE: [],
            HookType.POST_TOOL_USE: [],
            HookType.TOOL_ERROR: [],
            HookType.TOOL_SKIP: [],
        }
        self._global_hooks: list[HookDefinition] = []  # 全局 Hook（对所有工具生效）

    def register(self, definition: HookDefinition) -> None:
        """注册 Hook

        Args:
            definition: Hook 定义
        """
        if definition.trigger.tool_names is None and definition.trigger.categories is None:
            # 全局 Hook
            self._global_hooks.append(definition)
        else:
            # 特定工具 Hook
            self._hooks[definition.hook_type].append(definition)

        # 按优先级排序
        self._hooks[definition.hook_type].sort(key=lambda h: h.priority, reverse=True)
        self._global_hooks.sort(key=lambda h: h.priority, reverse=True)

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

        Args:
            name: Hook 名称

        Returns:
            是否成功注销
        """
        # 从特定工具 Hook 中移除
        for hooks in self._hooks.values():
            for i, hook in enumerate(hooks):
                if hook.name == name:
                    hooks.pop(i)
                    return True

        # 从全局 Hook 中移除
        for i, hook in enumerate(self._global_hooks):
            if hook.name == name:
                self._global_hooks.pop(i)
                return True

        return False

    def get_hooks(self, hook_type: HookType, tool_name: str | None = None) -> list[HookDefinition]:
        """获取指定类型和工具的 Hook

        Args:
            hook_type: Hook 类型
            tool_name: 工具名称（可选）

        Returns:
            匹配的 Hook 列表
        """
        result: list[HookDefinition] = []

        # 添加全局 Hook
        for hook in self._global_hooks:
            if hook.hook_type == hook_type and hook.enabled:
                result.append(hook)

        # 添加特定工具 Hook
        for hook in self._hooks[hook_type]:
            if not hook.enabled:
                continue

            if hook.trigger.tool_names is None and hook.trigger.categories is None:
                continue

            # 检查是否匹配
            if hook.trigger.tool_names and tool_name not in hook.trigger.tool_names:
                continue

            result.append(hook)

        return result

    def list_all(self) -> list[HookDefinition]:
        """列出所有已注册的 Hook

        Returns:
            Hook 列表
        """
        all_hooks = list(self._global_hooks)
        for hooks in self._hooks.values():
            all_hooks.extend(hooks)
        return all_hooks

    def enable(self, name: str) -> bool:
        """启用 Hook

        Args:
            name: Hook 名称

        Returns:
            是否成功启用
        """
        for hook in self.list_all():
            if hook.name == name:
                hook.enabled = True
                return True
        return False

    def disable(self, name: str) -> bool:
        """禁用 Hook

        Args:
            name: Hook 名称

        Returns:
            是否成功禁用
        """
        for hook in self.list_all():
            if hook.name == name:
                hook.enabled = False
                return True
        return False

    def clear(self) -> None:
        """清除所有 Hook"""
        self._hooks = {ht: [] for ht in HookType}
        self._global_hooks = []


# 全局单例
_global_hook_manager: HookManager | None = None


def get_hook_manager() -> HookManager:
    """获取全局 Hook 管理器

    Returns:
        全局 HookManager 实例
    """
    global _global_hook_manager
    if _global_hook_manager is None:
        _global_hook_manager = HookManager()
    return _global_hook_manager


def reset_hook_manager() -> None:
    """重置全局 Hook 管理器（用于测试）"""
    global _global_hook_manager
    if _global_hook_manager is not None:
        _global_hook_manager.clear()
    _global_hook_manager = None