/*
 *  Copyright (c) 2023-2026, Easy-Agents (fuhai999@gmail.com).
 *  <p>
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  <p>
 *  http://www.apache.org/licenses/LICENSE-2.0
 *  <p>
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.easyagents.core.model.chat.tool;

import com.easyagents.core.message.ToolCall;

public final class ToolContextHolder {

    private static final ThreadLocal<ToolContext> CONTEXT_HOLDER = new ThreadLocal<>();

    private ToolContextHolder() {
        // 工具类，禁止实例化
    }


    public static ToolContextScope beginExecute(Tool tool, ToolCall toolCall) {
        ToolContext ctx = new ToolContext(tool, toolCall);
        CONTEXT_HOLDER.set(ctx);
        return new ToolContextScope(ctx);
    }

    public static ToolContext currentContext() {
        return CONTEXT_HOLDER.get();
    }

    public static void clear() {
        CONTEXT_HOLDER.remove();
    }


    /**
     * 用于 try-with-resources 的作用域对象，确保上下文自动清理。
     */
    public static class ToolContextScope implements AutoCloseable {

        ToolContext context;

        public ToolContextScope(ToolContext context) {
            this.context = context;
        }

        @Override
        public void close() {
            clear();
        }
    }
}
