"""
Claude Plugins 模式的 Hook 加载器

支持通过 .claude-plugin/plugin.json 配置 hooks 和 mcpServers。
"""
import os
import json
import logging
import asyncio
import subprocess
from typing import List, Dict, Optional, Any

logger = logging.getLogger('app')

# Hook 类型定义
HOOK_TYPES = {
    'PrePrompt': '在system_prompt加载时注入内容',
    'PostAgent': '在agent执行后处理',
    'PreSave': '在保存消息前处理',
}


async def execute_hooks(hook_type: str, config, **kwargs) -> Any:
    """
    执行指定类型的所有 hooks

    Args:
        hook_type: hook 类型 (PrePrompt, PostAgent, PreSave)
        config: AgentConfig 对象
        **kwargs: hook 特定的参数
            - PrePrompt: 无额外参数，返回 str
            - PostAgent: response (str), metadata (dict)，返回 None
            - PreSave: content (str), role (str)，返回 str

    Returns:
        - PrePrompt: str (注入内容)
        - PostAgent: None
        - PreSave: str (处理后的内容)
    """
    hook_results = []
    bot_id = getattr(config, 'bot_id', '')

    skill_dirs = _get_skill_dirs(bot_id)

    for skill_dir in skill_dirs:
        if not os.path.exists(skill_dir):
            continue

        # 遍历 skill 目录下的每个子文件夹
        for skill_name in os.listdir(skill_dir):
            skill_path = os.path.join(skill_dir, skill_name)
            if not os.path.isdir(skill_path):
                continue

            plugin_json = os.path.join(skill_path, '.claude-plugin', 'plugin.json')
            if not os.path.exists(plugin_json):
                continue

            try:
                plugin_config = _load_plugin_config(plugin_json)
                hooks = plugin_config.get('hooks', {}).get(hook_type, [])

                for hook_config in hooks:
                    if hook_config.get('type') == 'command':
                        command = hook_config.get('command')
                        if command:
                            # 在 skill 目录下执行命令
                            result = await _execute_command(
                                skill_path, command, hook_type, config, **kwargs
                            )
                            if result:
                                hook_results.append(result)
                                logger.info(f"Executed {hook_type} hook from {skill_name}")

            except Exception as e:
                logger.error(f"Failed to load hooks from {plugin_json}: {e}")

    # 根据hook类型返回结果
    if hook_type == 'PrePrompt':
        return "\n\n".join(hook_results)
    elif hook_type == 'PreSave':
        # PreSave 返回处理后的内容
        # 如果有hook返回内容，使用最后一个hook的结果
        # 否则返回原始内容
        return hook_results[-1] if hook_results else kwargs.get('content', '')
    return None


async def merge_skill_mcp_configs(bot_id: str) -> List[Dict]:
    """
    从所有 skill 目录的 plugin.json 中读取 mcpServers 并合并

    Args:
        bot_id: Bot ID

    Returns:
        List[Dict]: 合并后的MCP设置列表
    """
    skill_dirs = _get_skill_dirs(bot_id)
    merged_servers = {}

    for skill_dir in skill_dirs:
        if not os.path.exists(skill_dir):
            continue

        for skill_name in os.listdir(skill_dir):
            skill_path = os.path.join(skill_dir, skill_name)
            if not os.path.isdir(skill_path):
                continue

            plugin_json = os.path.join(skill_path, '.claude-plugin', 'plugin.json')
            if os.path.exists(plugin_json):
                try:
                    with open(plugin_json, 'r', encoding='utf-8') as f:
                        plugin_config = json.load(f)
                        servers = plugin_config.get('mcpServers', {})
                        if servers:
                            merged_servers.update(servers)
                            logger.info(f"Loaded MCP config from skill: {skill_name}")
                except Exception as e:
                    logger.error(f"Failed to load mcpServers from {skill_name}: {e}")

    if merged_servers:
        return [{"mcpServers": merged_servers}]

    return []


def _load_plugin_config(plugin_json_path: str) -> Dict:
    """加载 plugin.json 配置"""
    try:
        with open(plugin_json_path, 'r', encoding='utf-8') as f:
            return json.load(f)
    except Exception as e:
        logger.error(f"Failed to load plugin.json: {e}")
        return {}


def _get_skill_dirs(bot_id: str) -> List[str]:
    """获取需要扫描的skill目录列表"""
    dirs = []

    # 用户上传的skills目录
    if bot_id:
        robot_skills = f"projects/robot/{bot_id}/skills"
        if os.path.exists(robot_skills):
            dirs.append(robot_skills)

    return dirs


async def _execute_command(skill_path: str, command: str, hook_type: str, config, **kwargs) -> Optional[str]:
    """执行 hook 命令

    Args:
        skill_path: skill 目录路径，作为工作目录
        command: 要执行的命令
        hook_type: hook 类型
        config: AgentConfig 对象
        **kwargs: 额外参数

    Returns:
        str: 命令的 stdout 输出
    """
    try:
        # 设置环境变量，传递给子进程
        env = os.environ.copy()
        env['BOT_ID'] = getattr(config, 'bot_id', '')
        env['USER_IDENTIFIER'] = getattr(config, 'user_identifier', '')
        env['SESSION_ID'] = getattr(config, 'session_id', '')
        env['LANGUAGE'] = getattr(config, 'language', '')
        env['HOOK_TYPE'] = hook_type

        # 对于 PreSave，传递 content
        if hook_type == 'PreSave':
            env['CONTENT'] = kwargs.get('content', '')
            env['ROLE'] = kwargs.get('role', '')

        # 对于 PostAgent，传递 response
        if hook_type == 'PostAgent':
            env['RESPONSE'] = kwargs.get('response', '')
            metadata = kwargs.get('metadata', {})
            env['METADATA'] = json.dumps(metadata) if metadata else ''

        # 使用 subprocess 执行命令，捕获 stdout
        process = await asyncio.create_subprocess_shell(
            command,
            cwd=skill_path,
            env=env,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE
        )

        stdout, stderr = await process.communicate()

        if stdout:
            result = stdout.decode('utf-8').strip()
            return result

        if stderr and process.returncode != 0:
            logger.warning(f"Hook command stderr: {stderr.decode('utf-8')}")

        return None

    except Exception as e:
        logger.error(f"Error executing hook command '{command}': {e}")
        return None