"""Install psutil on managed servers via SSH (system Python for watch probe)."""

from __future__ import annotations

from server.application.server_batch_common import sudo_wrap
from server.domain.models import Server
from server.infrastructure.ssh.asyncssh_pool import exec_ssh_command

# Try --user pip, then distro packages, then system pip. Verify with same python3 as watch probe.
PSUTIL_INSTALL_SHELL = r"""
set -e
verify_psutil() {
  for py in python3 python3.12 python3.11 python3.10; do
    if command -v "$py" >/dev/null 2>&1 && "$py" -c "import psutil" 2>/dev/null; then
      echo psutil_ok
      exit 0
    fi
  done
  return 1
}
verify_psutil || true

for py in python3 python3.12 python3.11 python3.10; do
  command -v "$py" >/dev/null 2>&1 || continue
  if "$py" -m pip install --user -q psutil 2>/dev/null; then
    verify_psutil && exit 0
  fi
done

if command -v apt-get >/dev/null 2>&1; then
  apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install -y -qq python3-psutil \
    && verify_psutil && exit 0
fi
if command -v dnf >/dev/null 2>&1; then
  dnf install -y -q python3-psutil && verify_psutil && exit 0
fi
if command -v yum >/dev/null 2>&1; then
  yum install -y -q python3-psutil && verify_psutil && exit 0
fi

for py in python3 python3.12 python3.11 python3.10; do
  command -v "$py" >/dev/null 2>&1 || continue
  if "$py" -m pip install -q psutil 2>/dev/null; then
    verify_psutil && exit 0
  fi
done

echo "ERROR: psutil install failed — pip/apt unavailable or permission denied" >&2
exit 1
"""


def build_psutil_install_cmd(*, ssh_user: str) -> str:
    return sudo_wrap(PSUTIL_INSTALL_SHELL.strip(), ssh_user)


async def install_psutil_via_ssh(server: Server, *, timeout: int = 90) -> dict[str, str | int]:
    """Run remote install; returns {exit_code, stdout, stderr, already_installed?}."""
    ssh_user = (server.username or "root").strip()
    cmd = build_psutil_install_cmd(ssh_user=ssh_user)
    result = await exec_ssh_command(server, cmd, timeout=timeout)
    stdout = (result.get("stdout") or "").strip()
    stderr = (result.get("stderr") or "").strip()
    raw_exit = result.get("exit_code")
    exit_code = int(raw_exit) if raw_exit is not None else 1
    if exit_code == 0 and "psutil_ok" in stdout:
        return {
            "success": True,
            "exit_code": 0,
            "stdout": stdout[:2000],
            "stderr": stderr[:500],
            "message": "psutil 已就绪",
        }
    detail = stderr or stdout or f"exit {exit_code}"
    return {
        "success": False,
        "exit_code": exit_code,
        "stdout": stdout[:2000],
        "stderr": stderr[:500],
        "message": detail[:300],
    }