"""``hermes photon ...`` CLI subcommands (registered via ``ctx.register_cli_command()``):
setup (device login + project + user + sidecar), status, install-sidecar (npm install in
the sidecar dir), telemetry [on|off]. Device login is the first step of ``setup`` (no
standalone ``login`` verb); inbound is the gRPC stream, so there are no webhook subcommands.
"""
from __future__ import annotations

import argparse
import getpass
import os
import subprocess
import sys
from typing import Optional

from hermes_cli.colors import Colors, color

from . import auth as photon_auth
from .adapter import sidecar_deps_installed
from hermes_constants import find_node_executable, with_hermes_node_path
from .sidecar_paths import _NPM_ERROR_LOG_MAX_CHARS, _npm_error_log, _sidecar_dir
import contextlib


def register_cli(parser: argparse.ArgumentParser) -> None:
    """Wire up `hermes photon ...` subcommands."""
    subs = parser.add_subparsers(dest="photon_command", required=False)
    p_setup = subs.add_parser("setup", help="First-time setup (device login + project + user + sidecar)")
    p_setup.add_argument("--project-name", default=None, help="Project name (default: 'Hermes Agent')")
    p_setup.add_argument("--phone", default=None, help="Your E.164 phone number (e.g. +15551234567)")
    p_setup.add_argument("--first-name", default=None)
    p_setup.add_argument("--last-name", default=None)
    p_setup.add_argument("--email", default=None)
    p_setup.add_argument("--no-browser", action="store_true",
                         help="Don't try to open a browser for device login; print the URL only")
    p_setup.add_argument("--skip-sidecar-install", action="store_true",
                         help="Skip `npm install` inside the sidecar directory")
    subs.add_parser("status", help="Show login + project + sidecar dep state")
    subs.add_parser("install-sidecar", help="Run npm install inside the sidecar directory")
    p_telemetry = subs.add_parser("telemetry", help="Show or toggle Spectrum SDK telemetry (on/off)")
    p_telemetry.add_argument(
        "state", nargs="?", choices=("on", "off"),
        help="Turn telemetry on or off (omit to show the current state)")
    parser.set_defaults(func=dispatch)


def dispatch(args: argparse.Namespace) -> int:
    sub = getattr(args, "photon_command", None)
    handler = _cmd_status if sub is None else _COMMANDS.get(sub)  # no subcommand — status by default
    if handler is None:
        print(f"unknown subcommand: {sub}", file=sys.stderr)
        return 2
    return handler(args)


# -- Subcommand handlers -------------------------------------------------------------

def _run_device_login(args: argparse.Namespace) -> int:
    """Run the RFC 8628 device-code login flow and persist the token (first step of ``setup``)."""
    def _print_code(code):
        print("\n┌─ Photon device login ────────────────────────────────────────\n"
              f"│  Open this URL:  {code.verification_uri_complete or code.verification_uri}\n"
              f"│  Enter the code: {code.user_code}\n"
              "│  (waiting for approval — Ctrl-C to cancel)\n"
              "└──────────────────────────────────────────────────────────────\n")
    try:
        photon_auth.login_device_flow(open_browser=not args.no_browser, on_user_code=_print_code)
    except Exception as e:
        print(f"login failed: {e}", file=sys.stderr)
        return 1
    # Never print any portion of the token (shoulder-surfing / screen recordings).
    print(f"✓ logged in — token saved to {photon_auth._auth_json_path()}")
    return 0


def _setup_token(args: argparse.Namespace) -> Optional[str]:
    """[1/5] Reuse a valid dashboard token or run device login; None on failure."""
    token = photon_auth.load_photon_token()
    if token:
        # The dashboard token has a short TTL (~3-4 days); a stale one makes every management
        # call 401, so validate upfront and fall back to a fresh login.
        print("[1/5] Checking existing Photon token...")
        if photon_auth.check_photon_token_valid(token):
            print("  ✓ token is valid")
            print("[1/5] Reusing existing Photon token")
            return token
        print("  ✗ token is stale (dashboard rejected it) — re-authenticating")
        photon_auth.clear_photon_token()
    print("[1/5] No valid Photon token found — running device login...")
    if _run_device_login(args) != 0:
        return None
    token = photon_auth.load_photon_token()
    if not token:
        print("login completed but token was not stored", file=sys.stderr)
    return token


def _setup_project(token: str, name: str) -> Optional[str]:
    """[2/5] Find or create the project; returns its id or None on failure."""
    dashboard_id = photon_auth.load_dashboard_project_id()
    try:
        if dashboard_id:
            print("[2/5] Reusing configured Photon project")
        elif (existing := photon_auth.find_project_by_name(token, name)) and existing.get("id"):
            dashboard_id = existing["id"]
            print(f"[2/5] Found existing project '{name}'")
        else:
            print(f"[2/5] Creating Photon project '{name}'...")
            dashboard_id = photon_auth.create_project(token, name=name).get("id")
            print("  ✓ project created")
    except Exception as e:
        print(f"project setup failed: {e}", file=sys.stderr)
        return None
    if not dashboard_id:
        print("could not resolve a Photon project id", file=sys.stderr)
        return None
    return dashboard_id


def _setup_credentials(token: str, dashboard_id: str, name: str) -> Optional[str]:
    """[3/5] Provision Spectrum credentials (runtime -> .env, ids -> auth.json); the dashboard
    id *is* the Spectrum id. A valid existing secret is reused: regenerating breaks a running
    sidecar's sends until restart. Returns the secret or None."""
    try:
        # 3. Spectrum is always enabled and provisioned at create-time, and the dashboard project id *is*
        #   the Spectrum project id (ids unified), so there's nothing to enable — the id we already have is
        #   the Spectrum id. Regenerating invalidates the credential that a running sidecar holds in its
        #   process env, causing all outbound sends to fail with AuthenticationError until the gateway is
        #   restarted (GH #50755).
        print("[3/5] Provisioning Spectrum credentials...")
        existing_id, existing_secret = photon_auth.load_project_credentials()
        secret: str = ""
        if existing_id and existing_secret:
            with contextlib.suppress(Exception):  # failure => fall through to regeneration
                photon_auth.list_users(existing_id, existing_secret)  # lightweight validation
                secret = existing_secret
        reused = bool(secret)
        if not secret:
            secret = photon_auth.regenerate_project_secret(token, dashboard_id)
        photon_auth.store_project_credentials(
            spectrum_project_id=dashboard_id, project_secret=secret, dashboard_project_id=dashboard_id, name=name)
        if reused:
            print(f"  ✓ Spectrum ready (project id {dashboard_id}) — existing credentials valid")
        else:
            print(f"  ✓ Spectrum ready (project id {dashboard_id}) — new secret saved")
            print("  ⚠ Project secret was regenerated. If the gateway is running, "
                  "restart it so the sidecar picks up the new secret:\n"
                  "      hermes gateway restart")
    except Exception as e:
        print(f"spectrum provisioning failed: {e}", file=sys.stderr)
        return None
    return secret


def _cmd_setup(args: argparse.Namespace) -> int:
    name = args.project_name or photon_auth.DEFAULT_PROJECT_NAME
    token = _setup_token(args)
    dashboard_id = token and _setup_project(token, name)
    secret = dashboard_id and _setup_credentials(token, dashboard_id, name)
    if not secret:
        return 1
    # 4. Register the operator's phone number as a Spectrum user (idempotent).
    phone = args.phone or _prompt(color("[4/5] Your iMessage phone number (E.164, e.g. +15551234567): ", Colors.CYAN))
    agent_number = registered_phone = registered_user_id = None
    if not phone:
        print("      Skipped user registration (no phone given). Re-run with --phone later.")
    else:
        try:  # name/email are optional and never prompted for (--first-name / --email)
            user, created = photon_auth.register_user_if_absent(
                dashboard_id, secret, phone_number=phone, first_name=args.first_name,
                last_name=args.last_name, email=args.email)
        except ValueError as e:
            print(f"      invalid phone number: {e}", file=sys.stderr)
            return 1
        except Exception as e:
            print(f"      user registration failed: {e}", file=sys.stderr)
            return 1
        print("  ✓ phone registered" if created else "  ✓ phone already registered")
        registered_phone = phone
        registered_user_id = user.get("id")
        # The number to text the agent is the user's assigned line ("TEXTS ON"); shared-number
        # plans have no dedicated /lines entry.
        agent_number = photon_auth.user_assigned_line(user)
        # Otherwise the gateway denies the operator's own inbound and has no cron home space.
        _autoconfigure_access(phone)
    # 5. Surface the agent's iMessage number.
    if not agent_number:
        try:
            line = photon_auth.get_imessage_line(token, dashboard_id)
            if line:
                agent_number = line.get("phoneNumber")
        except Exception as e:
            print(f"      (could not fetch the assigned line: {e})", file=sys.stderr)
    if agent_number:
        print("\n" + "\n".join((
            color("┌─ Your agent's iMessage number ───────────────────────────────", Colors.GREEN),
            color("│  📱 ", Colors.GREEN) + color(str(agent_number), Colors.GREEN, Colors.BOLD),
            color("│  Text this number from your phone to talk to your agent.", Colors.GREEN),
            color("└──────────────────────────────────────────────────────────────", Colors.GREEN))))
    else:
        print("      No iMessage line assigned yet — check the Photon dashboard.")
    if registered_phone:
        try:
            photon_auth.store_user_numbers(
                phone_number=registered_phone, assigned_phone_number=agent_number,
                user_id=str(registered_user_id) if registered_user_id else None, dashboard_project_id=dashboard_id)
        except Exception as e:
            print(f"      (could not save Photon status metadata: {e})", file=sys.stderr)
    # 6. Sidecar deps (spectrum-ts).
    if args.skip_sidecar_install:
        print("[5/5] Skipping sidecar npm install (--skip-sidecar-install)")
    else:
        print("[5/5] Installing Node sidecar deps (spectrum-ts)...")
        rc = _install_sidecar()
        if rc != 0:
            return rc
    # 7. Enable the platform in config.yaml, or the channel silently stays offline.
    try:
        from hermes_cli.config import write_platform_config_field
        write_platform_config_field("photon", "enabled", True, raw=True)
        print("  ✓ photon platform enabled in config.yaml")
    except Exception as e:
        print(f"      (could not enable Photon in config: {e})", file=sys.stderr)
    print("\n✓ Photon setup complete.\n  Start the gateway:  hermes gateway start")
    return 0


def _autoconfigure_access(phone: str) -> None:
    """Set PHOTON_ALLOWED_USERS and PHOTON_HOME_CHANNEL to the operator's number, each only
    when unset so a hand-tuned value is never clobbered on re-run."""
    try:
        from hermes_cli.config import get_env_value, save_env_value
    except ImportError:
        return
    for key, label in (("PHOTON_ALLOWED_USERS", "allowlisted your number"),
                       ("PHOTON_HOME_CHANNEL", "set your DM as the cron home channel")):
        try:
            if get_env_value(key):
                print(f"      {key} already set — leaving it as-is.")
                continue
            save_env_value(key, phone)
            print(f"  ✓ {label} ({key})")
        except Exception as e:
            print(f"      could not set {key}: {e}", file=sys.stderr)


def _cmd_status(_args: argparse.Namespace) -> int:
    phone, assigned = photon_auth.load_user_numbers()
    if not (phone and assigned):
        spectrum_id, project_secret = photon_auth.load_project_credentials()
        if spectrum_id and project_secret:
            try:
                photon_auth.refresh_user_numbers(spectrum_id, project_secret)
            except Exception as e:
                print(f"      (could not refresh Photon user numbers: {e})", file=sys.stderr)
    # auth.print_credential_summary's emit callback is the only sink that sees
    # credential-derived strings (keeps cli.py taint-free for CodeQL).
    photon_auth.print_credential_summary(print)
    node_bin = find_node_executable("node")
    sidecar_installed = sidecar_deps_installed()
    print(f"  node binary         : {node_bin or '✗ missing (install Node 18+)'}")
    print(f"  sidecar deps        : {'✓ installed' if sidecar_deps_installed() else '✗ run `hermes photon install-sidecar`'}")
    print(f"  telemetry           : {'on' if _telemetry_enabled() else 'off'} (`hermes photon telemetry on|off`)")
    return 0


def _telemetry_enabled() -> bool:
    """PHOTON_TELEMETRY from env / ~/.hermes/.env; truthy set mirrors the sidecar's."""
    try:
        from hermes_cli.config import get_env_value
        raw = get_env_value("PHOTON_TELEMETRY")
    except ImportError:
        raw = os.getenv("PHOTON_TELEMETRY")
    return (raw or "").strip().lower() in ("1", "true", "yes", "on")


def _cmd_telemetry(args: argparse.Namespace) -> int:
    state = getattr(args, "state", None)
    if state is None:
        print(f"Photon telemetry: {'on' if _telemetry_enabled() else 'off'}")
        print("  Toggle with `hermes photon telemetry on` / `hermes photon telemetry off`.")
        return 0
    try:
        from hermes_cli.config import save_env_value
        save_env_value("PHOTON_TELEMETRY", "true" if state == "on" else "false")
    except Exception as e:
        print(f"could not save PHOTON_TELEMETRY: {e}", file=sys.stderr)
        return 1
    print(f"✓ Spectrum telemetry turned {state} (PHOTON_TELEMETRY in ~/.hermes/.env)")
    print("  Restart the gateway for the sidecar to pick it up:  hermes gateway restart")
    return 0


def _install_sidecar() -> int:
    import pm

    try:
        npm = find_node_executable("npm")
        env = with_hermes_node_path()
        if npm is None:
            env = pm.ensure("npm", explicit=True).env
            installed = pm.installed_package("npm")
            if installed is None or installed.binary is None:
                raise pm.InstallError("npm", "ensured but no selected binary was recorded")
            npm = str(installed.binary)
    except pm.InstallError as exc:
        print(f"Could not prepare Photon dependencies: {exc}", file=sys.stderr)
        return 1
    # spectrum-ts is pinned exactly (the SDK ships breaking majors); upgrades are deliberate —
    # never `@latest` (see README "Upgrading spectrum-ts"). `npm ci` installs the lockfile
    # verbatim; `npm install` is the fallback for a missing/drifted lockfile.
    print(f"  $ cd {_sidecar_dir()} && {npm} ci")

    def _run(verb: str) -> subprocess.CompletedProcess:
        # stdout streams to the terminal; stderr is captured so the failure reason can be
        # persisted for check_requirements() to surface later.
        proc = subprocess.run(  # noqa: S603
            [npm, verb], cwd=str(_sidecar_dir()), check=False, stderr=subprocess.PIPE, text=True, env=env)
        if proc.stderr:
            print(proc.stderr, end="", file=sys.stderr)
        return proc
    proc = _run("ci")
    if proc.returncode != 0:
        print(f"  npm ci failed — falling back to:  {npm} install")
        proc = _run("install")
    error = (proc.stderr or "").strip()[:_NPM_ERROR_LOG_MAX_CHARS]  # bounded to what check_requirements surfaces
    if proc.returncode != 0:
        print("npm install failed", file=sys.stderr)
    with contextlib.suppress(OSError):
        if proc.returncode == 0:
            _npm_error_log().unlink()
        elif error:
            _npm_error_log().write_text(error, encoding="utf-8")
    return proc.returncode


_COMMANDS = {
    "setup": _cmd_setup, "status": _cmd_status, "install-sidecar": lambda _args: _install_sidecar(),
    "telemetry": _cmd_telemetry}


def gateway_setup() -> None:
    """Run Photon first-time setup from the unified `hermes gateway setup` wizard (same flow
    as ``hermes photon setup``; phone is prompted when stdin is a TTY)."""
    _cmd_setup(argparse.Namespace(
        photon_command="setup", project_name=None, phone=None, first_name=None, last_name=None,
        email=None, no_browser=False, skip_sidecar_install=False))


def _prompt(prompt: str, *, secret: bool = False) -> str:
    if not sys.stdin.isatty():
        return ""
    try:
        return (getpass.getpass(prompt) if secret else input(prompt)).strip()
    except (KeyboardInterrupt, EOFError):
        print()
        return ""