"""Gateway platform setup wizard (hermes gateway setup): platform registry/status table, per-platform setup prompts, service offer.

Extracted from ``hermes_cli/gateway.py``. Bodies read facade helpers through ``_gw()`` (late
binding on ``hermes_cli.gateway``) so the seams tests and callers patch on the facade keep
intercepting the moved code.
"""
from __future__ import annotations

import shutil
import subprocess
import sys


def _gw():
    from hermes_cli import gateway  # late: the facade imports this module
    return gateway


# Built-in per-platform setup config (env vars, instructions, prompts). Telegram, WhatsApp, Email,
# SMS, etc. live in plugins/platforms/<name>/ and are discovered via the platform registry.
_PLATFORMS = [
    {
        "key": "mattermost", "label": "Mattermost", "emoji": "💬", "token_var": "MATTERMOST_TOKEN",
        "setup_instructions": [
            "1. In Mattermost: Integrations → Bot Accounts → Add Bot Account",
            "   (System Console → Integrations → Bot Accounts must be enabled)",
            "2. Give it a username (e.g. hermes) and copy the bot token",
            "3. Works with any self-hosted Mattermost instance — enter your server URL",
            "4. To find your user ID: click your avatar (top-left) → Profile",
            "   Your user ID is displayed there — click it to copy.",
            "   ⚠ This is NOT your username — it's a 26-character alphanumeric ID.",
            "5. To get a channel ID: click the channel name → View Info → copy the ID",
        ],
        "vars": [
            {"name": "MATTERMOST_URL", "prompt": "Server URL (e.g. https://mm.example.com)",
             "password": False, "help": "Your Mattermost server URL. Works with any self-hosted instance."},
            {"name": "MATTERMOST_TOKEN", "prompt": "Bot token", "password": True,
             "help": "Paste the bot token from step 2 above."},
            {"name": "MATTERMOST_ALLOWED_USERS", "prompt": "Allowed user IDs (comma-separated)",
             "password": False, "is_allowlist": True, "help": "Your Mattermost user ID from step 4 above."},
            {"name": "MATTERMOST_HOME_CHANNEL",
             "prompt": "Home channel ID (for cron/notification delivery, or empty to set later with /set-home)",
             "password": False, "help": "Channel ID where Hermes delivers cron results and notifications."},
            {"name": "MATTERMOST_REPLY_MODE",
             "prompt": "Reply mode — 'off' for flat messages, 'thread' for threaded replies (default: off)",
             "password": False,
             "help": "off = flat channel messages, thread = replies nest under your message."},
        ],
    },
]


def _all_platforms() -> list[dict]:
    """Built-in ``_PLATFORMS`` plus registry plugin platforms (same dict shape, source in
    ``_registry_entry``). Plugins are discovered here (idempotent) so the setup menu works without a
    running gateway; user-installed ones still need ``plugins.enabled`` (untrusted code). Matrix is
    hidden on Windows: python-olm has no wheel or native build (use WSL)."""
    try:
        from hermes_cli.plugins import discover_plugins
        discover_plugins()
    except Exception as e:
        _gw().logger.debug("plugin discovery failed during platform enumeration: %s", e)

    hide_matrix = sys.platform == "win32"
    platforms = [dict(p) for p in _gw()._PLATFORMS if not (hide_matrix and p.get("key") == "matrix")]
    by_key = {p["key"]: p for p in platforms}

    try:
        from gateway.platform_registry import platform_registry
    except Exception:
        return platforms

    for entry in platform_registry.all_entries():
        if entry.name in by_key or (hide_matrix and entry.name == "matrix"):
            continue
        platforms.append({
            "key": entry.name, "label": entry.label, "emoji": entry.emoji,
            "token_var": entry.required_env[0] if entry.required_env else "",
            "install_hint": entry.install_hint, "_registry_entry": entry,
        })
    return platforms


def _platform_status(platform: dict) -> str:
    """Plain-text status string; uncolored because ANSI codes break curses menu width math."""
    entry = platform.get("_registry_entry")
    if entry is not None:
        # Prefer is_connected (env + config.yaml) over check_fn (a coarse deps gate). Never fall back
        # to check_fn when is_connected returned False, or "SDK installed" would override "no token".
        try:
            if entry.is_connected is not None:
                from gateway.config import PlatformConfig
                configured = bool(entry.is_connected(PlatformConfig(enabled=True)))
            else:
                configured = bool(entry.check_fn())
        except Exception:
            configured = False
        return "configured" if configured else "not configured"

    token_var = platform.get("token_var", "")
    if not token_var:
        return "not configured"
    return "configured" if _gw().get_env_value(token_var) else "not configured"


def _set_platform_unauthorized_dm_behavior(platform_key: str, behavior: str) -> None:
    """Persist a platform-specific unauthorized-DM policy in config.yaml."""
    _gw().write_platform_config_field(platform_key, "unauthorized_dm_behavior", behavior, raw=True)


def print_setup_header(title: str) -> None:
    print()
    print(_gw().color(f"  ─── {title} Setup ───", _gw().Colors.CYAN))


def confirm_reconfigure(label: str, *env_vars: str) -> bool:
    """False when ``label`` is already configured (all ``env_vars`` set) and the user declines."""
    if all(_gw().get_env_value(v) for v in env_vars):
        print()
        _gw().print_success(f"{label} is already configured.")
        return _gw().prompt_yes_no(f"  Reconfigure {label}?", False)
    return True


def offer_home_channel(home_var: str, user_id: str, what: str) -> None:
    """Offer to persist ``user_id`` as ``home_var`` (e.g. "your Telegram user ID")."""
    if _gw().prompt_yes_no(f"  Use {what} ({user_id}) as the home channel?", True):
        _gw().save_env_value(home_var, user_id)
        _gw().print_success(f"  Home channel set to {user_id}")


def save_env_values(**values: str) -> None:
    for name, value in values.items():
        _gw().save_env_value(name, value)


def prompt_csv(prompt_text: str, default: str) -> str:
    """Comma-separated ID prompt with whitespace stripped."""
    return _gw().prompt(prompt_text, default, password=False).replace(" ", "")


# (default index, *choices) for the no-allowlist access prompt, keyed by is_email.
_UNAUTHORIZED_ACCESS_CHOICES = {
    True: (3,
        "Enable open access (any email sender can message the bot)",
        "Use DM pairing (unknown email senders receive a pairing code)",
        "Politely decline unknown senders (one-time message, then silence)",
        "Keep unknown senders silent"),
    False: (1,
        "Enable open access (anyone can message the bot)",
        "Use DM pairing (unknown users request access, you approve with 'hermes pairing approve')",
        "Politely decline unknown senders (one-time message, then silence)",
        "Skip for now (bot will deny all users until configured)"),
}


def _prompt_unauthorized_access(platform_key: str) -> None:
    """No allowlist was given — ask open access vs DM pairing vs decline vs skip/silent, and persist."""
    is_email = platform_key == "email"
    print()
    default_idx, *access_choices = _UNAUTHORIZED_ACCESS_CHOICES[is_email]
    access_idx = _gw().prompt_choice("  How should unauthorized users be handled?", access_choices, default_idx)
    if access_idx == 0:
        _gw().save_env_value("EMAIL_ALLOW_ALL_USERS" if is_email else "GATEWAY_ALLOW_ALL_USERS", "true")
        _gw().print_warning("  Open access enabled — anyone can use your bot!")
    elif access_idx == 1:
        if is_email:
            _set_platform_unauthorized_dm_behavior("email", "pair")
        _gw().print_success("  DM pairing mode — users will receive a code to request access.")
        _gw().print_info("  Approve with: hermes pairing approve <platform> <code>")
    elif access_idx == 2:
        _set_platform_unauthorized_dm_behavior(platform_key, "decline")
        _gw().print_success("  Unknown senders get one polite decline, then silence (unauthorized_dm_behavior: decline).")
    elif is_email:
        _gw().print_success("  Unknown email senders will be ignored.")
    else:
        _gw().print_info("  Skipped — configure later with 'hermes gateway setup'")


def _telegram_auto_setup(token_var: str) -> tuple[bool, object]:
    """Offer the managed-bot QR flow. Returns (token_saved, owner_user_id)."""
    print()
    _gw()._print_info_lines(
        "  Telegram can be configured automatically with a managed bot:",
        "  [1] Automatic (scan QR → confirm in Telegram → done)", "  [2] Manual BotFather token",
    )
    if _gw().prompt("  Choice [1/2]", default="1").strip() != "1":
        return False, None
    try:
        from hermes_cli.telegram_managed_bot import (
            auto_setup_telegram_bot_result, is_valid_telegram_bot_token,
        )
    except ImportError:
        _gw().print_warning("  Automatic setup is unavailable in this install.")
        return False, None
    result = auto_setup_telegram_bot_result()
    if result and is_valid_telegram_bot_token(result.token):
        _gw().save_env_value(token_var, result.token)
        _gw().print_success("  Saved TELEGRAM_BOT_TOKEN")
        return True, result.owner_user_id
    if result:
        _gw().print_warning("  Automatic setup returned an invalid Telegram token.")
    print()
    _gw().print_info("  Falling back to manual setup...")
    return False, None


def _clean_discord_ids(cleaned: str) -> str:
    """Strip common Discord prefixes (user:123, <@123>, <@!123>) from a comma-separated list."""
    parts = []
    for uid in cleaned.split(","):
        uid = uid.strip()
        if uid.startswith("<@") and uid.endswith(">"):
            uid = uid.lstrip("<@!").rstrip(">")
        if uid.lower().startswith("user:"):
            uid = uid[5:]
        if uid:
            parts.append(uid)
    return ",".join(parts)


def _prompt_allowlist_var(var: dict, platform_key: str, auto_owner_user_id) -> str | None:
    """Allowlist prompt for one var; returns the saved value or None (open-access prompt shown)."""
    if "TELEGRAM" in var["name"] and auto_owner_user_id:
        detected_id = str(auto_owner_user_id)
        _gw().print_success(f"  Detected your Telegram user ID: {detected_id}")
        if _gw().prompt_yes_no("  Allow this Telegram account to use the bot?", True):
            extra = _gw().prompt("  Additional allowed user IDs (comma-separated, optional)", password=False)
            ids = [detected_id]
            for uid in extra.replace(" ", "").split(","):
                if uid and uid not in ids:
                    ids.append(uid)
            cleaned = ",".join(ids)
            _gw().save_env_value(var["name"], cleaned)
            _gw().print_success("  Saved — only these users can interact with the bot.")
            return cleaned

    _gw()._print_info_lines(
        "  The gateway DENIES all users by default for security.",
        "  Enter user IDs to create an allowlist, or leave empty",
        "  and you'll be asked about open access next.",
    )
    value = _gw().prompt(f"  {var['prompt']}", password=False)
    if not value:
        _prompt_unauthorized_access(platform_key)
        return None
    cleaned = value.replace(" ", "")
    if "DISCORD" in var["name"]:
        cleaned = _clean_discord_ids(cleaned)
    _gw().save_env_value(var["name"], cleaned)
    _gw().print_success("  Saved — only these users can interact with the bot.")
    return cleaned


def _setup_standard_platform(platform: dict):
    """Interactive setup for Telegram, Discord, or Slack."""
    from hermes_cli.setup_hidden_env import is_setup_hidden_env as _is_setup_hidden_env
    emoji, label, token_var = platform["emoji"], platform["label"], platform["token_var"]
    print_setup_header(f"{emoji} {label}")

    instructions = platform.get("setup_instructions")
    if instructions:
        print()
        _gw()._print_info_lines(*(f"  {line}" for line in instructions))

    if not confirm_reconfigure(label, token_var):
        return

    auto_token_saved, auto_owner_user_id = False, None
    if platform.get("key") == "telegram":
        auto_token_saved, auto_owner_user_id = _telegram_auto_setup(token_var)

    allowed_val_set = None  # Track if user set an allowlist (for home channel offer)

    # Skip knobs the setup forms hide (home channel, reply mode, proxy...): they're self-configuring.
    setup_vars = [
        v for v in platform["vars"]
        if v["name"] == token_var or v.get("is_allowlist") or not _is_setup_hidden_env(v["name"])
    ]

    for var in setup_vars:
        print()
        _gw().print_info(f"  {var['help']}")
        existing = _gw().get_env_value(var["name"])
        if existing and var["name"] != token_var:
            _gw().print_info(f"  Current: {existing}")

        if auto_token_saved and var["name"] == token_var:
            _gw().print_info("  Token saved by automatic setup.")
            continue

        if var.get("is_allowlist"):
            saved = _prompt_allowlist_var(var, platform.get("key"), auto_owner_user_id)
            if saved is not None:
                allowed_val_set = saved
            continue

        value = _gw().prompt(f"  {var['prompt']}", password=var.get("password", False))
        if value:
            _gw().save_env_value(var["name"], value)
            _gw().print_success(f"  Saved {var['name']}")
        elif var["name"] == token_var:
            _gw().print_warning(f"  Skipped — {label} won't work without this.")
            return
        else:
            _gw().print_info("  Skipped (can configure later)")

    # Offer the first allowlisted user ID as home channel when none is set (Telegram DMs).
    home_var = f"{label.upper()}_HOME_CHANNEL"
    home_val = _gw().get_env_value(home_var)
    if allowed_val_set and not home_val and label == "Telegram":
        first_id = allowed_val_set.split(",")[0].strip()
        if first_id:
            offer_home_channel(home_var, first_id, "your user ID")

    print()
    _gw().print_success(f"{emoji} {label} configured!")


def _builtin_setup_fn(key: str):
    """Resolve a built-in platform's setup function; late-bound to dodge the hermes_cli.setup cycle."""
    from hermes_cli import setup as _s
    return {
        # telegram/discord/slack/whatsapp/dingtalk/feishu/wecom setup_fns come from their plugins.
        "webhooks": _gw().setup_platforms._setup_webhooks,
    }.get(key)


def _configure_platform(platform: dict) -> None:
    """Plugin ``setup_fn`` -> built-in by key -> ``_setup_standard_platform`` (``vars``) -> env-var hint.
    Bundled plugins auto-load; user plugins must already be in ``plugins.enabled``."""
    entry = platform.get("_registry_entry")
    fn = entry.setup_fn if entry is not None else None
    if fn is None:
        fn = _builtin_setup_fn(platform["key"])
    if fn is not None:
        fn()
        return
    if platform.get("vars"):
        _gw()._setup_standard_platform(platform)
        return

    label = platform.get("label", platform["key"])
    print_setup_header(f"{platform.get('emoji', '🔌')} {label}")
    required = entry.required_env if entry else []
    if required:
        _gw().print_info(f"  Set these env vars in ~/.hermes/.env: {', '.join(required)}")
    else:
        _gw().print_info(f"  Configure {label} in config.yaml under gateway.platforms.{platform['key']}")
    if platform.get("install_hint"):
        _gw().print_info(f"  {platform['install_hint']}")


def _wizard_offer_service_action(action: str, question: str, failed_label: str, **kwargs) -> None:
    """Wizard start/restart prompt; prints remediation instead when system scope would need root."""
    if _gw().supports_systemd_services() and _gw()._system_scope_wizard_would_need_root():
        _gw()._print_system_scope_remediation(action)
    elif _gw().prompt_yes_no(question, True):
        _gw()._setup_service_action(action, failed_label=failed_label, **kwargs)


def _setup_service_action(
    action: str, *, failed_label: str, windows: bool = True, system: bool = False
) -> None:
    """Run a wizard service start/restart, printing remediation instead of raising. ``windows=False``
    skips Windows (pre-platform status block never offers it); ``system`` is a fresh install's scope."""
    try:
        backend = _gw()._service_backend(windows=windows)
        if backend is not None:
            _gw()._service_call(backend, action, None if action == "restart" else system)
        elif action == "restart" and windows:
            _gw().stop_profile_gateway()
            _gw().print_info("Start manually: hermes gateway")
    except _gw().UserSystemdUnavailableError as e:
        _gw().print_error(f"  {failed_label} — user systemd not reachable:")
        _gw()._print_indented(str(e))
    except _gw().SystemScopeRequiresRootError as e:
        # Defense in depth: the wizard's root pre-check should have caught this.
        _gw().print_error(f"  {failed_label}: {e}")
        _gw()._print_system_scope_remediation(action)
    except subprocess.CalledProcessError as e:
        _gw().print_error(f"  {failed_label}: {e}")


_WIZARD_BANNER = (
    "┌─────────────────────────────────────────────────────────┐",
    "│             ☤ Gateway Setup                            │",
    "├─────────────────────────────────────────────────────────┤",
    "│  Configure messaging platforms and the gateway service. │",
    "│  Press Ctrl+C at any time to exit.                     │",
    "└─────────────────────────────────────────────────────────┘",
)


_WIZARD_BACKEND_LABELS = {"systemd": "systemd", "launchd": "launchd", "windows": "Scheduled Task"}


# Post-setup guidance when no service backend applies, keyed by the fallthrough reason.
_WIZARD_NO_SERVICE_LINES = {
    "wsl": (
        "  WSL detected but systemd is not running.", "  Run in foreground: hermes gateway run",
        "  For persistence:   tmux new -s hermes 'hermes gateway run'",
        "  To enable systemd: add systemd=true to /etc/wsl.conf, then 'wsl --shutdown'",
    ),
    "termux": (
        "  Termux does not use systemd/launchd services.", "  Run in foreground: hermes gateway run",
        "  Or start it manually in the background (best effort): nohup hermes gateway run >{home}/logs/gateway.log 2>&1 &",
    ),
    "unsupported": (
        "  Service install not supported on this platform.", "  Run in foreground: hermes gateway run",
    ),
}


def _wizard_service_status_block() -> None:
    """Pre-platform service status: warnings, then offer to start an installed-but-stopped service."""
    print()
    service_installed = _gw()._is_service_installed()
    service_running = _gw()._is_service_running()

    if _gw().supports_systemd_services() and _gw().has_conflicting_systemd_units():
        _gw().print_systemd_scope_conflict_warning()
        print()

    if _gw().supports_systemd_services() and _gw().has_legacy_hermes_units():
        _gw().print_legacy_unit_warning()
        print()

    if service_installed and service_running:
        _gw().print_success("Gateway service is installed and running.")
    elif service_installed:
        _gw().print_warning("Gateway service is installed but not running.")
        _wizard_offer_service_action("start", "  Start it now?", "Failed to start", windows=False)
    else:
        _gw().print_info("Gateway service is not installed yet.")
        _gw().print_info("You'll be offered to install it after configuring platforms.")


def _wizard_platform_loop() -> None:
    while True:
        print()
        _gw().print_header("Messaging Platforms")

        platforms = _gw()._all_platforms()
        menu_items = [f"{p['emoji']} {p['label']}  ({_platform_status(p)})" for p in platforms] + ["Done"]
        choice = _gw().prompt_choice("Select a platform to configure:", menu_items, len(menu_items) - 1)
        if choice == len(platforms):
            break
        _gw()._configure_platform(platforms[choice])


def _wizard_install_service(backend: str) -> None:
    """Fresh install from the wizard: ask start-now / start-on-login once, install, then start.

    The Windows installer owns its start decision (Scheduled Task and Startup-folder
    paths start the gateway themselves when start_now is true, and a UAC hand-off
    installs and starts in the elevated child), so the wizard forwards the answers
    and returns without a second start. Each install-intent question is asked exactly
    once per setup run."""
    wsl_note = " (note: services may not survive WSL restarts)" if _gw().is_wsl() else ""
    start_now = _gw().prompt_yes_no("  Start the gateway now?", True)
    start_on_login = _gw().prompt_yes_no(
        f"  Start the gateway automatically on login/boot as a {_WIZARD_BACKEND_LABELS[backend]} service?"
        f"{wsl_note}",
        True,
    )
    if not (start_now or start_on_login):
        _gw().print_info("  Skipped start and auto-start setup.")
        _gw().print_info("  You can install later: hermes gateway install")
        if _gw().supports_systemd_services():
            _gw().print_info("  Or as a boot-time service: sudo hermes gateway install --system")
        _gw().print_info("  Or run in foreground:  hermes gateway run")
        return
    try:
        installed_scope, did_install = None, True
        if backend == "systemd":
            installed_scope, did_install = _gw().install_linux_gateway_from_setup(
                force=False, enable_on_startup=start_on_login
            )
        elif backend == "launchd":
            _gw().launchd_install(force=False, start_now=start_now)
        else:
            _gw()._gw_windows().install(force=False, start_now=start_now, start_on_login=start_on_login)
            return
        print()
        if did_install and start_now:
            _gw()._setup_service_action("start", failed_label="Start failed", system=installed_scope == "system")
    except subprocess.CalledProcessError as e:
        _gw().print_error(f"  Install failed: {e}")
        _gw().print_info("  You can try manually: hermes gateway install")
    except SystemExit:
        # The backend installers exit non-zero on a refused write (a unit pinning another home);
        # setup reports it and goes on rather than ending the wizard.
        _gw().print_warning("  Gateway service install did not complete.")
        _gw().print_info("  You can try manually: hermes gateway install")


def _wizard_post_setup() -> None:
    """Offer to install/start/restart the gateway once at least one platform has progress."""
    print()
    print(_gw().color("─" * 58, _gw().Colors.DIM))
    if _gw()._served_profile_needs_no_service():
        return
    service_installed = _gw()._is_service_installed()
    service_running = _gw()._is_service_running()

    if service_running:
        _wizard_offer_service_action("restart", "  Restart the gateway to pick up changes?", "Restart failed")
    elif service_installed:
        _wizard_offer_service_action("start", "  Start the gateway service?", "Start failed")
    else:
        print()
        backend = _gw()._service_backend()
        if backend is not None:
            _gw()._wizard_install_service(backend)
            return
        if _gw().is_wsl():
            reason, home = "wsl", ""
        elif _gw().is_termux():
            from hermes_constants import display_hermes_home as _dhh
            reason, home = "termux", _dhh()
        else:
            reason, home = "unsupported", ""
        _gw()._print_info_lines(*(line.format(home=home) for line in _WIZARD_NO_SERVICE_LINES[reason]))


def gateway_setup():
    """Interactive setup for messaging platforms + gateway service."""
    if _gw().is_managed():
        _gw().managed_error("run gateway setup")
        return

    print()
    for banner_line in _WIZARD_BANNER:
        print(_gw().color(banner_line, _gw().Colors.MAGENTA))

    _wizard_service_status_block()
    _wizard_platform_loop()

    # Meaningful progress on any platform; ``_platform_status`` already handles plugin dual states.
    def _is_progress(status: str) -> bool:
        s = status.lower()
        return not (s == "not configured" or s.startswith("partially") or s.startswith("plugin disabled"))

    if any(_is_progress(_gw()._platform_status(p)) for p in _gw()._all_platforms()):
        _gw()._wizard_post_setup()
    else:
        print()
        _gw().print_info("No platforms configured. Run 'hermes gateway setup' when ready.")

    print()