"""SSH remote bootstrap: enable Baota API, token, whitelist, base_url."""

from __future__ import annotations

import base64
import json
import logging
import shlex
from typing import Any

from server.domain.models import Server
from server.infrastructure.ssh.asyncssh_pool import exec_ssh_command

logger = logging.getLogger("nexus.btpanel.ssh_bootstrap")

# Runs on sub-server as root; stdout = one JSON line
_REMOTE_SCRIPT = r"""
import json, os, secrets, sys, subprocess

PANEL_ROOT = "/www/server/panel"
DATA_DIR = os.path.join(PANEL_ROOT, "data")
API_PATH = os.path.join(DATA_DIR, "api.json")

def read_text(path, default=""):
    try:
        with open(path, "r", encoding="utf-8") as f:
            return f.read().strip()
    except FileNotFoundError:
        return default

def emit(obj):
    print(json.dumps(obj, ensure_ascii=False))
    sys.exit(0)

def main():
    if len(sys.argv) < 2:
        emit({"ok": False, "error": "bad_args", "message": "missing payload"})
    try:
        payload = json.loads(sys.argv[1])
    except json.JSONDecodeError:
        emit({"ok": False, "error": "bad_args", "message": "invalid payload"})
    center_ip = (payload.get("center_ip") or "").strip()
    panel_host = (payload.get("panel_host") or "").strip()
    if not center_ip:
        emit({"ok": False, "error": "missing_center_ip", "message": "center_ip required"})
    if not os.path.isdir(PANEL_ROOT):
        emit({"ok": False, "error": "bt_not_installed", "message": "panel not installed"})
    port = read_text(os.path.join(DATA_DIR, "port.pl"), "8888") or "8888"
    admin_path = read_text(os.path.join(DATA_DIR, "admin_path.pl"), "")
    ssl = os.path.exists(os.path.join(DATA_DIR, "ssl.pl"))
    scheme = "https" if ssl else "http"
    host = panel_host or "127.0.0.1"
    base = f"{scheme}://{host}:{port}"
    if admin_path and admin_path != "/":
        base += "/" + admin_path.strip("/")
    api = {}
    if os.path.isfile(API_PATH):
        try:
            with open(API_PATH, "r", encoding="utf-8") as f:
                api = json.load(f)
        except Exception:
            api = {}
    actions = []
    token = (api.get("token") or "").strip()
    if not token:
        token = secrets.token_hex(16)
        actions.append("created_token")
    if not api.get("open"):
        actions.append("enabled_api")
    api["open"] = True
    api["token"] = token
    limit = api.get("limit_addr")
    if not isinstance(limit, list):
        limit = []
    if center_ip not in limit:
        limit.append(center_ip)
        actions.append("appended_whitelist")
    api["limit_addr"] = limit
    tmp = API_PATH + ".nexus.tmp"
    with open(tmp, "w", encoding="utf-8") as f:
        json.dump(api, f, ensure_ascii=False)
    os.chmod(tmp, 0o600)
    os.replace(tmp, API_PATH)
    try:
        subprocess.run(["/etc/init.d/bt", "reload"], capture_output=True, timeout=30)
    except Exception:
        pass
    emit({
        "ok": True,
        "base_url": base,
        "api_key": token,
        "actions": actions,
        "verify_ssl": False,
    })

if __name__ == "__main__":
    main()
"""


def build_bootstrap_command(*, center_ip: str, panel_host: str) -> str:
    payload = json.dumps({"center_ip": center_ip, "panel_host": panel_host}, ensure_ascii=False)
    script_b64 = base64.b64encode(_REMOTE_SCRIPT.encode("utf-8")).decode("ascii")
    return (
        f"echo {shlex.quote(script_b64)} | base64 -d > /tmp/nexus_bt_bootstrap.py && "
        f"python3 /tmp/nexus_bt_bootstrap.py {shlex.quote(payload)}; "
        f"rc=$?; rm -f /tmp/nexus_bt_bootstrap.py; exit $rc"
    )


def classify_ssh_result(result: dict[str, Any]) -> tuple[str, bool]:
    """Return (error_code, permanent)."""
    status = result.get("status") or ""
    stderr = (result.get("stderr") or "").lower()
    stdout = (result.get("stdout") or "").lower()
    if status == "connection_error":
        return "ssh_connection_failed", False
    if status == "timeout":
        return "ssh_timeout", False
    # SSH 认证失败（勿把远程脚本写 api.json 的 PermissionError 误判为永久失败）
    auth_markers = (
        "permission denied (publickey)",
        "permission denied (password)",
        "permission denied, please try again",
        "authentication failed",
        "auth fail",
        "no more authentication methods",
    )
    if any(m in stderr for m in auth_markers):
        return "ssh_auth_failed", True
    if status != "success" or int(result.get("exit_code") or 1) != 0:
        if "permission denied" in stdout and "api.json" in stdout:
            return "ssh_permission_denied", False
        return "ssh_command_failed", False
    return "", False


def parse_bootstrap_stdout(stdout: str) -> dict[str, Any]:
    text = (stdout or "").strip()
    if not text:
        raise ValueError("empty bootstrap output")
    line = text.splitlines()[-1].strip()
    data = json.loads(line)
    if not isinstance(data, dict):
        raise ValueError("bootstrap output not object")
    if not data.get("ok"):
        code = str(data.get("error") or "bootstrap_failed")
        raise BootstrapRemoteError(code, str(data.get("message") or code))
    return data


class BootstrapRemoteError(Exception):
    def __init__(self, code: str, message: str):
        super().__init__(message)
        self.code = code


async def ssh_bootstrap_panel(server: Server, *, center_ip: str) -> dict[str, Any]:
    cmd = build_bootstrap_command(center_ip=center_ip, panel_host=(server.domain or "").strip())
    result = await exec_ssh_command(server, cmd, timeout=60, login_shell=False)
    err_code, permanent = classify_ssh_result(result)
    if err_code:
        raise BootstrapRemoteError(err_code, result.get("stderr") or err_code)
    try:
        return parse_bootstrap_stdout(result.get("stdout") or "")
    except BootstrapRemoteError:
        raise
    except (json.JSONDecodeError, ValueError) as exc:
        logger.warning("bootstrap parse failed server=%s: %s stdout=%s", server.id, exc, (result.get("stdout") or "")[:200])
        raise BootstrapRemoteError("bootstrap_parse_failed", str(exc)) from exc