#!/usr/bin/env python3
"""Verify the Hermes Agent environment this tree ships into.

Exit 0: every required directory and every required tool is present.
Exit 1: at least one of them is genuinely absent; the line naming it is printed.
Exit 2: usage error.

What "available" means. A tool is available only if `hermes_tools` imports and
exposes a *callable* of that name. Nothing else counts: a name in a list is not
a measurement, which is what this file used to print (`available[tool] = True`
in a loop over a hard-coded list, so run under a bare python3 with no Hermes
session it reported four tools and "verified successfully", rc 0 -- Q109).

Resolution. The profile home is --home, else $HERMES_HOME (which in this
install names the active profile's home, e.g. ~/.hermes/profiles/<profile>),
else ~/.hermes/profiles/$HERMES_PROFILE (default profile: spark). The Hermes
root is --root, else the parent of the profile home's `profiles` directory,
else the profile home's own parent. Every path graded is derived from those two,
so the check can be pointed at a synthetic tree and be seen to fail. The
env-first pattern is the lane's own: hermes_agent_verify.py:27.

Graded by test_env_verifiers.py (black box -- runs this file as a subprocess and
imports nothing from it) and by CHECK-env-verifiers.

Run: python3 snippet.py [--home DIR] [--root DIR] [--profile NAME] [--require TOOL]
"""

import argparse
import importlib
import os
import sys
from pathlib import Path

TOOLS = ["web_search", "web_extract", "read_file", "write_file"]


def profile_name(override=None):
    """The profile named in the reading: --profile, else $HERMES_PROFILE, else spark."""
    if override:
        return override
    return os.environ.get("HERMES_PROFILE") or "spark"


def profile_home(override=None, profile="spark"):
    """The profile home this check grades."""
    if override:
        return Path(override).expanduser()
    env = os.environ.get("HERMES_HOME", "")
    if env:
        return Path(env).expanduser()
    return Path.home() / ".hermes" / "profiles" / profile


def hermes_root(profile_home_dir, override=None):
    """The Hermes root: --root, else the parent of `profiles`, else the parent."""
    if override:
        return Path(override).expanduser()
    profile_home_dir = Path(profile_home_dir)
    if profile_home_dir.parent.name == "profiles":
        return profile_home_dir.parent.parent
    return profile_home_dir.parent


def required_dirs(profile_home_dir, root):
    """Directories whose absence makes the reading fail."""
    profile_home_dir = Path(profile_home_dir)
    return [
        Path(root),
        profile_home_dir,
        profile_home_dir / "cache" / "scratch",
    ]


def optional_dirs(root):
    """Directories this lane does not depend on; a miss is noted, not failed."""
    root = Path(root)
    return [root / "skills", root / "plugins"]


def check_environment(profile_home_dir, root):
    """Return (missing_required, present_optional, missing_optional) as strings."""
    missing = [str(p) for p in required_dirs(profile_home_dir, root) if not p.is_dir()]
    present_opt = [str(p) for p in optional_dirs(root) if p.is_dir()]
    missing_opt = [str(p) for p in optional_dirs(root) if not p.is_dir()]
    return missing, present_opt, missing_opt


def check_tools(names=None):
    """Import hermes_tools and ask it for each named tool.

    Returns (available: dict[str, bool], error: str). `error` is the import
    failure when the package cannot be imported at all, "" otherwise. A name
    that resolves to a non-callable is unavailable, not available-but-odd.
    """
    names = list(names or TOOLS)
    try:
        module = importlib.import_module("hermes_tools")
    except Exception as exc:  # ImportError, or a module that raises on import
        return {name: False for name in names}, "%s: %s" % (type(exc).__name__, exc)
    available = {}
    for name in names:
        try:
            candidate = getattr(module, name, None)
        except Exception:
            candidate = None
        available[name] = callable(candidate)
    return available, ""


def build_parser():
    parser = argparse.ArgumentParser(
        description="Verify Hermes directories and tools; 0 pass, 1 fail, 2 usage.",
    )
    parser.add_argument("--home", default=None,
                        help="profile home to grade (default: $HERMES_HOME or ~/.hermes/profiles/<profile>)")
    parser.add_argument("--root", default=None,
                        help="Hermes root to grade (default: derived from the profile home)")
    parser.add_argument("--profile", default=None,
                        help="profile name (default: $HERMES_PROFILE or spark)")
    parser.add_argument("--require", action="append", default=[], metavar="TOOL",
                        help="also require this tool (repeatable); the negative-control hook")
    return parser


def main(argv=None):
    args = build_parser().parse_args(argv)  # exits 2 on a usage error
    profile = profile_name(args.profile)
    home = profile_home(args.home, profile)
    root = hermes_root(home, args.root)
    names = list(TOOLS) + [n for n in args.require if n not in TOOLS]

    missing_dirs, present_opt, missing_opt = check_environment(home, root)
    available, error = check_tools(names)
    unavailable = [n for n in names if not available.get(n)]

    print("HERMES_ROOT: %s" % root)
    print("HERMES_HOME: %s" % home)
    print("HERMES_PROFILE: %s" % profile)
    for path in [str(p) for p in required_dirs(home, root)]:
        print("DIR %s: %s" % ("MISSING" if path in missing_dirs else "OK", path))
    for path in present_opt:
        print("DIR OPTIONAL-OK: %s" % path)
    for path in missing_opt:
        print("DIR OPTIONAL-MISSING: %s" % path)
    if error:
        print("TOOLS_IMPORT_FAILED: %s" % error)
    print("TOOLS_AVAILABLE: %s" % sorted(n for n in names if available.get(n)))
    print("TOOLS_MISSING: %s" % unavailable)

    ok = not missing_dirs and not unavailable
    print("VERDICT: %s" % ("PASS" if ok else "FAIL"))
    return 0 if ok else 1


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