"""REPL 交互终端 - 基于 Python cmd 模块"""
import cmd
import shlex
import sys
import readline
import os
from pathlib import Path

from oss import __version__

HISTORY_FILE = str(Path.home() / ".nebula_repl_history")


class NebulaShell(cmd.Cmd):
    """NebulaShell REPL 交互终端"""

    def __init__(self, plugin_mgr):
        super().__init__()
        self.plugin_mgr = plugin_mgr
        self.prompt = "\033[1;36mNebula>\033[0m "  # 青色提示符
        self.intro = (
            f"\033[1;33mNebulaShell Core v{__version__}\033[0m\n"
            "输入 \033[1;32mhelp\033[0m 查看命令列表  |  输入 \033[1;31mexit\033[0m 退出"
        )

        # 加载历史记录
        self._load_history()

    def _load_history(self):
        """加载命令历史记录"""
        try:
            readline.read_history_file(HISTORY_FILE)
        except (FileNotFoundError, OSError) as e:
            print(f"[REPL] 文件操作失败: {e}")
        readline.set_history_length(500)

    def _save_history(self):
        """保存命令历史记录"""
        try:
            readline.write_history_file(HISTORY_FILE)
        except OSError as e:
            print(f"[REPL] 系统错误: {e}")

    def _get_plugins(self):
        """获取所有已加载的插件列表"""
        if not self.plugin_mgr:
            return []
        return list(self.plugin_mgr.plugins.keys())

    def _get_injected_functions(self):
        """获取所有 PL 注入的功能"""
        if not self.plugin_mgr:
            return {}
        return self.plugin_mgr.pl_injector.get_registry_info()

    # ── 命令：plugins ──

    def do_plugins(self, arg):
        """列出所有已加载的插件"""
        plugins = self._get_plugins()
        if not plugins:
            print("\033[1;33m没有已加载的插件\033[0m")
            return
        print(f"\033[1;36m已加载插件 ({len(plugins)}):\033[0m")
        for name in plugins:
            info = self.plugin_mgr.get_info(name)
            if info:
                status = ""
                if self.plugin_mgr.fallback_manager.is_degraded(name):
                    status = " \033[1;31m[降级]\033[0m"
                print(f"  \033[1;32m{name}\033[0m v{info.version} - {info.description}{status}")
            else:
                print(f"  \033[1;32m{name}\033[0m")

    # ── 命令：pl ──

    def do_pl(self, arg):
        """列出所有 PL 注入的功能"""
        registry = self._get_injected_functions()
        if not registry:
            print("\033[1;33m没有 PL 注入功能\033[0m")
            return
        print(f"\033[1;36mPL 注入功能 ({len(registry)}):\033[0m")
        for name, info in registry.items():
            descs = [d for d in info["descriptions"] if d]
            desc_str = f" - {descs[0]}" if descs else ""
            print(f"  \033[1;32m{name}\033[0m (来自 {', '.join(info['plugins'])}){desc_str}")

    # ── 命令：call ──

    def do_call(self, arg):
        """调用 PL 注入功能: call <function_name> [args...]"""
        if not arg:
            print("\033[1;33m用法: call <function_name> [args...]\033[0m")
            return
        parts = shlex.split(arg)
        name = parts[0]
        args = parts[1:]
        funcs = self.plugin_mgr.pl_injector.get_injected_functions(name)
        if not funcs:
            print(f"\033[1;31m未找到功能: {name}\033[0m")
            return
        for func in funcs:
            try:
                result = func(*args)
                if result is not None:
                    print(result)
            except Exception as e:
                print(f"\033[1;31m执行失败: {e}\033[0m")

    # ── 命令：status ──

    def do_status(self, arg):
        """显示 Core 状态"""
        if not self.plugin_mgr:
            print("\033[1;31mCore 未就绪\033[0m")
            return
        status = self.plugin_mgr.get_status()
        print(f"\033[1;36mCore 状态:\033[0m")
        print(f"  插件总数: {status['plugins']['total']}")
        if status['plugins']['degraded']:
            print(f"  降级插件: \033[1;31m{', '.join(status['plugins']['degraded'])}\033[0m")
        print(f"  HTTP 服务: {'\033[1;32m运行中\033[0m' if status['http_server'] else '\033[1;31m未启动\033[0m'}")
        print(f"  防篡改监控: {'\033[1;32m运行中\033[0m' if status['tamper_monitor'] else '\033[1;31m未启动\033[0m'}")
        print(f"  审计日志: {status['audit_logs']} 条")
        print(f"  篡改告警: {status['tamper_alerts']} 条")
        print(f"  数据目录: {status['data_store']}")

    # ── 命令：audit ──

    def do_audit(self, arg):
        """查看审计日志: audit [plugin_name]"""
        if not self.plugin_mgr:
            return
        logs = self.plugin_mgr.get_audit_logs(plugin_name=arg if arg else None, limit=20)
        if not logs:
            print("\033[1;33m无审计日志\033[0m")
            return
        print(f"\033[1;36m审计日志 ({len(logs)} 条):\033[0m")
        for log in reversed(logs):
            t = log["time"]
            print(f"  [{log['plugin']}] {log['action']} - {log['detail']}")

    # ── 命令：alerts ──

    def do_alerts(self, arg):
        """查看防篡改告警"""
        if not self.plugin_mgr:
            return
        alerts = self.plugin_mgr.get_tamper_alerts()
        if not alerts:
            print("\033[1;32m无防篡改告警\033[0m")
            return
        print(f"\033[1;31m防篡改告警 ({len(alerts)}):\033[0m")
        for alert in alerts:
            print(f"  [{alert['plugin']}] {alert['message']}")

    # ── 命令：recover ──

    def do_recover(self, arg):
        """恢复降级插件: recover <plugin_name>"""
        if not arg:
            print("\033[1;33m用法: recover <plugin_name>\033[0m")
            return
        if self.plugin_mgr.recover_plugin(arg):
            print(f"\033[1;32m插件 '{arg}' 已恢复\033[0m")
        else:
            print(f"\033[1;31m插件 '{arg}' 恢复失败（可能未处于降级状态）\033[0m")

    # ── 命令：exit ──

    def do_exit(self, arg):
        """退出 REPL"""
        self._save_history()
        print("\033[1;33m再见!\033[0m")
        return True

    def do_EOF(self, arg):
        """Ctrl+D 退出"""
        return self.do_exit(arg)

    def default(self, line):
        """未知命令"""
        print(f"\033[1;31m未知命令: {line}\033[0m  输入 \033[1;32mhelp\033[0m 查看命令列表")

    def emptyline(self):
        """空行不重复执行上一条命令"""
        pass