#!/usr/bin/env python3
"""SSH 隧道管理器 — 命令行模式(跨平台,无界面)。

用法:
  ssh-tunnel host add <名称> <user@host> [端口=22] [--password] [--key 路径]
  ssh-tunnel tunnel add <名称> --host <主机名或ID> --lp 本地端口 --rp 远程端口 [--rh 远程地址=127.0.0.1]
  ssh-tunnel start <隧道名或ID> [隧道...]     # 前台运行,Ctrl+C 退出
  ssh-tunnel stop-all                         # (与 start 配套,信号处理自动调用)
  ssh-tunnel list                             # 列出主机与隧道
  ssh-tunnel remove host|tunnel <名称或ID>
  ssh-tunnel test <主机名或ID>
"""
from __future__ import annotations

import argparse
import getpass
import signal
import sys
import time
from pathlib import Path

sys.path.insert(0, str(Path(__file__).parent))

from engine import TunnelManager, probe_host  # noqa: E402
from storage import Store, data_root  # noqa: E402


def _print(msg: str) -> None:
    print(msg, flush=True)


class _QuietEmit:
    """CLI 模式下把引擎事件打到终端。"""

    def __init__(self):
        self._last: dict[str, str] = {}

    def __call__(self, ev: dict) -> None:
        if ev.get("type") == "tunnel":
            if self._last.get(ev["id"]) == ev["status"]:
                return  # 状态未变(如连接计数刷新),不重复打印
            self._last[ev["id"]] = ev["status"]
            t = ev["status"]
            if t == "connected":
                _print("[隧道] 已连接")
            elif t == "error":
                _print(f"[隧道] 连接失败: {ev.get('error', '')}")
        elif ev.get("type") == "log":
            e = ev["entry"]
            lv = e["level"]
            mark = {"info": "·", "success": "✔", "warn": "!", "error": "×"}.get(lv, "·")
            _print(f"[{e['t']}] {mark} {e['msg']}")


def find_host(store: Store, ref: str):
    hosts = store.data["hosts"]
    return next((h for h in hosts if h["id"] == ref or h["name"] == ref), None)


def find_tunnel(store: Store, ref: str):
    ts = store.data["tunnels"]
    return next((t for t in ts if t["id"] == ref or t["name"] == ref), None)


def cmd_host_add(store, args) -> int:
    if "@" not in args.target:
        _print("错误: 目标格式应为 user@host")
        return 1
    user, host = args.target.rsplit("@", 1)
    auth = "key" if args.key else "password"
    if find_host(store, args.name):
        _print(f"错误: 主机「{args.name}」已存在")
        return 1
    password = passphrase = ""
    if auth == "password" and args.password:
        password = getpass.getpass("登录密码: ")
    if auth == "key" and args.key:
        if not Path(args.key).expanduser().exists():
            _print(f"错误: 私钥文件不存在: {args.key}")
            return 1
        passphrase = getpass.getpass("私钥口令(无则直接回车): ")
    store.data["hosts"].append({
        "id": Store.new_id(), "name": args.name, "hostname": host,
        "port": args.port, "username": user, "auth": auth,
        "password": password, "key_path": str(Path(args.key).expanduser()) if args.key else "",
        "key_passphrase": passphrase, "note": "",
    })
    store.save()
    _print(f"已添加主机 {user}@{host}:{args.port}(认证:{'私钥' if auth == 'key' else '密码'})")
    return 0


def cmd_tunnel_add(store, args) -> int:
    host = find_host(store, args.host)
    if not host:
        _print(f"错误: 找不到主机「{args.host}」,先执行 host add")
        return 1
    for t in store.data["tunnels"]:
        if t["local_port"] == args.lp:
            _print(f"错误: 本地端口 {args.lp} 已被隧道「{t['name']}」使用")
            return 1
    store.data["tunnels"].append({
        "id": Store.new_id(), "name": args.name, "host_id": host["id"],
        "local_port": args.lp, "remote_host": args.rh or "127.0.0.1",
        "remote_port": args.rp, "autostart": False, "autoreconnect": True,
    })
    store.save()
    _print(f"已添加隧道 {args.name}: 127.0.0.1:{args.lp} → {args.rh or '127.0.0.1'}:{args.rp}(经 {host['name']})")
    _print(f"启动: ssh-tunnel start {args.name}")
    return 0


def cmd_list(store, _args) -> int:
    if store.warn_plaintext:
        _print("提示: 当前平台无可用密钥后端,密码以明文保存于配置文件。")
    _print("主机:")
    if not store.data["hosts"]:
        _print("  (无)  添加: ssh-tunnel host add <名称> user@host")
    for h in store.data["hosts"]:
        _print(f"  {h['name']}  {h['username']}@{h['hostname']}:{h['port']}  "
               f"{'私钥' if h.get('auth') == 'key' else '密码'}")
    _print("隧道:")
    if not store.data["tunnels"]:
        _print("  (无)  添加: ssh-tunnel tunnel add <名称> --host <主机> --lp 本地端口 --rp 远程端口")
    for t in store.data["tunnels"]:
        h = next((x for x in store.data["hosts"] if x["id"] == t["host_id"]), None)
        hn = h["name"] if h else "(主机缺失)"
        _print(f"  {t['name']}  127.0.0.1:{t['local_port']} → {t['remote_host']}:{t['remote_port']}  经 {hn}")
    return 0


def cmd_test(store, args) -> int:
    host = find_host(store, args.host)
    if not host:
        _print(f"错误: 找不到主机「{args.host}」")
        return 1
    _print(f"正在测试 {host['username']}@{host['hostname']}:{host['port']} ...")
    ok, msg = probe_host(host, data_root() / "known_hosts")
    _print(("✔ " if ok else "× ") + msg)
    return 0 if ok else 1


def cmd_remove(store, args) -> int:
    if args.kind == "host":
        h = find_host(store, args.ref)
        if not h:
            _print(f"错误: 找不到主机「{args.ref}」")
            return 1
        used = [t["name"] for t in store.data["tunnels"] if t["host_id"] == h["id"]]
        if used:
            _print(f"错误: 主机被隧道使用: {', '.join(used)}")
            return 1
        store.data["hosts"].remove(h)
        store.save()
        _print(f"已删除主机 {h['name']}")
    else:
        t = find_tunnel(store, args.ref)
        if not t:
            _print(f"错误: 找不到隧道「{args.ref}」")
            return 1
        store.data["tunnels"].remove(t)
        store.save()
        _print(f"已删除隧道 {t['name']}")
    return 0


def cmd_start(store, args) -> int:
    refs = args.tunnels
    if not refs:  # 未指定则启动全部
        refs = [t["name"] for t in store.data["tunnels"]]
        if not refs:
            _print("没有已配置的隧道。先用 tunnel add 添加。")
            return 1
    hosts_by_id = {h["id"]: h for h in store.data["hosts"]}
    mgr = TunnelManager(_QuietEmit(), data_root())    chosen = []
    for r in refs:
        t = find_tunnel(store, r)
        if not t:
            _print(f"错误: 找不到隧道「{r}」")
            return 1
        chosen.append(t)
    mgr.apply_config(chosen, hosts_by_id)

    if store.warn_plaintext:
        _print("提示: 当前平台无可用密钥后端,密码以明文保存于配置文件。")
    names = ", ".join(t["name"] for t in chosen)
    _print(f"启动隧道: {names} — Ctrl+C 退出")

    stopping = False

    def _stop(*_a):
        nonlocal stopping
        if not stopping:
            stopping = True
            _print("\n正在断开所有隧道 ...")
            mgr.stop_all()

    signal.signal(signal.SIGINT, _stop)
    signal.signal(signal.SIGTERM, _stop)
    for t in mgr.tunnels.values():
        t.start()
    try:
        while not stopping:
            time.sleep(0.3)
            alive = [t for t in mgr.tunnels.values() if t.status != "stopped"]
            if not alive:
                _print("所有隧道已停止。")
                return 1
    except KeyboardInterrupt:
        _stop()
    return 0


def main() -> int:
    p = argparse.ArgumentParser(prog="ssh-tunnel", description="SSH 隧道管理器(命令行)")
    sub = p.add_subparsers(dest="cmd", required=True)

    sp = sub.add_parser("host", help="主机管理")
    hsub = sp.add_subparsers(dest="sub", required=True)
    ha = hsub.add_parser("add", help="添加主机")
    ha.add_argument("name", help="备注名称")
    ha.add_argument("target", help="user@host")
    ha.add_argument("port", nargs="?", type=int, default=22)
    ha.add_argument("--password", action="store_true", help="交互输入密码(默认)")
    ha.add_argument("--key", help="私钥文件路径")

    sp = sub.add_parser("tunnel", help="隧道管理")
    tsub = sp.add_subparsers(dest="sub", required=True)
    ta = tsub.add_parser("add", help="添加隧道")
    ta.add_argument("name")
    ta.add_argument("--host", required=True, help="主机名称或 ID")
    ta.add_argument("--lp", type=int, required=True, help="本地端口")
    ta.add_argument("--rp", type=int, required=True, help="远程端口")
    ta.add_argument("--rh", default="127.0.0.1", help="远程地址(默认 127.0.0.1)")

    sub.add_parser("list", help="列出主机与隧道")
    sub.add_parser("stop-all", help="预留(前台模式退出时自动断开)")

    st = sub.add_parser("start", help="前台启动隧道")
    st.add_argument("tunnels", nargs="*", help="隧道名称或 ID(空=全部)")

    ts = sub.add_parser("test", help="测试主机连通")
    ts.add_argument("host")

    rm = sub.add_parser("remove", help="删除主机或隧道")
    rm.add_argument("kind", choices=["host", "tunnel"])
    rm.add_argument("ref")

    args = p.parse_args()
    store = Store(data_root())

    if args.cmd == "host":
        return cmd_host_add(store, args)
    if args.cmd == "tunnel":
        return cmd_tunnel_add(store, args)
    if args.cmd == "list":
        return cmd_list(store, args)
    if args.cmd == "test":
        return cmd_test(store, args)
    if args.cmd == "remove":
        return cmd_remove(store, args)
    if args.cmd == "start":
        return cmd_start(store, args)
    if args.cmd == "stop-all":
        _print("隧道随前台进程退出自动断开,无需单独停止。")
        return 0
    return 1


if __name__ == "__main__":
    sys.exit(main())