"""Hermes Web UI -- startup helpers."""
from __future__ import annotations
import os, subprocess, sys
from pathlib import Path

def _agent_dir() -> Path | None:
    hermes_home = Path(os.environ.get('HERMES_HOME', str(Path.home() / '.hermes')))
    for raw in [os.environ.get('HERMES_WEBUI_AGENT_DIR', '').strip(), str(hermes_home / 'hermes-agent')]:
        if not raw:
            continue
        p = Path(raw).expanduser()
        if p.is_dir():
            return p.resolve()
    return None

def auto_install_agent_deps() -> bool:
    agent_dir = _agent_dir()
    if agent_dir is None:
        print('[!!] Auto-install skipped: agent directory not found.', flush=True)
        return False
    req_file = agent_dir / 'requirements.txt'
    pyproject = agent_dir / 'pyproject.toml'
    if req_file.exists():
        install_args = [sys.executable, '-m', 'pip', 'install', '--quiet', '-r', str(req_file)]
        print(f'     Installing from {req_file} ...', flush=True)
    elif pyproject.exists():
        install_args = [sys.executable, '-m', 'pip', 'install', '--quiet', str(agent_dir)]
        print(f'     Installing from {agent_dir} (pyproject.toml) ...', flush=True)
    else:
        print('[!!] Auto-install skipped: no requirements.txt or pyproject.toml in agent dir.', flush=True)
        return False
    try:
        result = subprocess.run(install_args, capture_output=True, text=True, timeout=120)
        if result.returncode != 0:
            print(f'[!!] pip install failed (exit {result.returncode}):', flush=True)
            for line in (result.stderr or '').splitlines()[-10:]:
                print(f'     {line}', flush=True)
            return False
        print('[ok] pip install completed.', flush=True)
        return True
    except subprocess.TimeoutExpired:
        print('[!!] Auto-install timed out after 120s.', flush=True)
        return False
    except Exception as e:
        print(f'[!!] Auto-install error: {e}', flush=True)
        return False