#!/usr/bin/env python3
"""Verify the disposable Leo wallet-test Telegram runtime without leaking tokens."""

from __future__ import annotations

import argparse
import json
import re
import subprocess
import sys
import urllib.error
import urllib.request
from datetime import datetime, timezone
from pathlib import Path

TOKEN_RE = re.compile(r"^\d{6,12}:[A-Za-z0-9_-]{25,}$")


def repo_root_from_script() -> Path:
    return Path(__file__).resolve().parents[1]


def parse_args(argv: list[str]) -> argparse.Namespace:
    parser = argparse.ArgumentParser(
        description="Check the Leo wallet-test Telegram bot token, getMe identity, and service state.",
        allow_abbrev=False,
    )
    parser.add_argument("--agent", default="leo-wallet-test", help="telegram/agents/<agent>.yaml")
    parser.add_argument("--repo-root", default=str(repo_root_from_script()))
    parser.add_argument("--secrets-dir", default="/opt/teleo-eval/secrets")
    parser.add_argument("--skip-getme", action="store_true", help="Do not call Telegram getMe")
    parser.add_argument("--require-token", action="store_true", help="Exit nonzero when token file is missing")
    parser.add_argument("--require-service-active", action="store_true", help="Exit nonzero unless systemd says active")
    parser.add_argument("--output", default="docs/reports/telegram-leo-wallet-test-runtime-proof.json")

    namespace, unknown = parser.parse_known_args(argv)
    if unknown:
        print(
            "ERROR: Unsupported arguments were provided. Secret-bearing CLI args are not accepted.",
            file=sys.stderr,
        )
        raise SystemExit(2)
    return namespace


def load_agent_config(repo_root: Path, agent: str):
    telegram_dir = repo_root / "telegram"
    sys.path.insert(0, str(telegram_dir))
    from agent_config import load_agent_config as load_config

    config_path = telegram_dir / "agents" / f"{agent}.yaml"
    config = load_config(str(config_path))
    return config_path, config


def token_path_for(secrets_dir: Path, bot_token_file: str) -> Path:
    token_file = Path(bot_token_file)
    if token_file.name != bot_token_file or token_file.name in {"", ".", ".."}:
        raise ValueError("bot_token_file must be a plain filename")
    return secrets_dir / token_file.name


def run_command(command: list[str]) -> dict:
    try:
        proc = subprocess.run(command, check=False, text=True, capture_output=True)
    except FileNotFoundError:
        return {
            "command": command,
            "returncode": 127,
            "stdout": "",
            "stderr": "command_unavailable",
        }
    return {
        "command": command,
        "returncode": proc.returncode,
        "stdout": proc.stdout.strip(),
        "stderr": proc.stderr.strip(),
    }


def systemd_state(unit: str) -> dict:
    active = run_command(["systemctl", "is-active", unit])
    enabled = run_command(["systemctl", "is-enabled", unit])
    return {
        "unit": unit,
        "active": active["stdout"] or "unknown",
        "activeReturncode": active["returncode"],
        "enabled": enabled["stdout"] or "unknown",
        "enabledReturncode": enabled["returncode"],
    }


def telegram_get_me(token: str, *, timeout_seconds: int = 20) -> dict:
    url = f"https://api.telegram.org/bot{token}/getMe"
    request = urllib.request.Request(url, headers={"Accept": "application/json"})
    try:
        with urllib.request.urlopen(request, timeout=timeout_seconds) as response:
            status = response.status
            body = json.loads(response.read().decode("utf-8"))
    except urllib.error.HTTPError as exc:
        status = exc.code
        try:
            body = json.loads(exc.read().decode("utf-8"))
        except Exception:
            body = {"ok": False, "error_code": exc.code, "description": "non_json_http_error"}
    except Exception as exc:
        return {
            "attempted": True,
            "httpStatus": None,
            "ok": False,
            "errorType": type(exc).__name__,
            "secretValuesIncluded": False,
        }

    result = body.get("result") if isinstance(body, dict) else None
    return {
        "attempted": True,
        "httpStatus": status,
        "ok": bool(body.get("ok")) if isinstance(body, dict) else False,
        "botIdPresent": isinstance(result, dict) and bool(result.get("id")),
        "isBot": result.get("is_bot") if isinstance(result, dict) else None,
        "username": result.get("username") if isinstance(result, dict) else None,
        "firstName": result.get("first_name") if isinstance(result, dict) else None,
        "canJoinGroups": result.get("can_join_groups") if isinstance(result, dict) else None,
        "canReadAllGroupMessages": result.get("can_read_all_group_messages") if isinstance(result, dict) else None,
        "supportsInlineQueries": result.get("supports_inline_queries") if isinstance(result, dict) else None,
        "secretValuesIncluded": False,
    }


def build_proof(args: argparse.Namespace) -> tuple[dict, int]:
    repo_root = Path(args.repo_root).resolve()
    secrets_dir = Path(args.secrets_dir)
    config_path, config = load_agent_config(repo_root, args.agent)
    token_path = token_path_for(secrets_dir, config.bot_token_file)
    unit = f"teleo-agent@{args.agent}.service"

    token_file_present = token_path.exists()
    token_shape_valid = False
    get_me = {"attempted": False, "ok": False, "secretValuesIncluded": False}
    exact_blocker = None
    token = None

    if token_file_present:
        token = token_path.read_text().strip()
        token_shape_valid = bool(TOKEN_RE.match(token))
        if not token_shape_valid:
            exact_blocker = "telegram_token_shape_invalid"
    else:
        exact_blocker = "telegram_token_file_missing"

    if token_file_present and token_shape_valid and not args.skip_getme:
        get_me = telegram_get_me(token)
        if not get_me.get("ok"):
            exact_blocker = "telegram_getme_failed"

    expected_username = config.handle.lstrip("@")
    username_matches = (
        bool(get_me.get("username"))
        and get_me.get("username", "").lower() == expected_username.lower()
    )
    if get_me.get("attempted") and get_me.get("ok") and not username_matches:
        exact_blocker = "telegram_getme_username_mismatch"

    service = systemd_state(unit)
    service_active = service["active"] == "active"
    if args.require_service_active and not service_active:
        exact_blocker = exact_blocker or "telegram_service_inactive"

    ok = (
        token_file_present
        and token_shape_valid
        and (args.skip_getme or (get_me.get("ok") and username_matches))
        and (service_active or not args.require_service_active)
    )
    if args.require_token and not token_file_present:
        ok = False

    proof = {
        "schema": "livingip.telegramLeoWalletTestRuntimeProof.v1",
        "generatedAt": datetime.now(timezone.utc).isoformat(),
        "ok": ok,
        "requiredTier": "T3_live_readonly",
        "currentTier": "T3_live_readonly" if ok else "T2_runtime",
        "agent": args.agent,
        "configPath": str(config_path),
        "expectedHandle": config.handle,
        "expectedUsername": expected_username,
        "tokenPath": str(token_path),
        "tokenFilePresent": token_file_present,
        "tokenShapeValid": token_shape_valid,
        "getMe": get_me,
        "usernameMatchesExpected": username_matches if get_me.get("attempted") else None,
        "service": service,
        "secretValuesIncluded": False,
        "exactBlocker": exact_blocker,
        "notProven": [
            "Telegram message delivery",
            "Telegram reply delivery",
            "Telegram-triggered x402 readback",
            "Telegram-triggered paid execution",
        ],
        "strongestClaimAllowed": (
            "This verifier proves the disposable Leo wallet-test Telegram token identity and service state "
            "after BotFather token installation. It does not send Telegram messages or prove x402 payment execution."
        ),
    }
    exit_code = 0 if ok or (exact_blocker == "telegram_token_file_missing" and not args.require_token) else 1
    return proof, exit_code


def main(argv: list[str] | None = None) -> int:
    args = parse_args(sys.argv[1:] if argv is None else argv)
    proof, exit_code = build_proof(args)
    output = json.dumps(proof, indent=2, sort_keys=True) + "\n"
    output_path = Path(args.output)
    output_path.parent.mkdir(parents=True, exist_ok=True)
    output_path.write_text(output)
    print(output, end="")
    return exit_code


if __name__ == "__main__":
    try:
        raise SystemExit(main())
    except ValueError as exc:
        print(f"ERROR: {exc}", file=sys.stderr)
        raise SystemExit(1) from None