"""Interactive messaging-platform setup wizards: WhatsApp (bridge + Cloud API), Slack manifest.

Split out of ``hermes_cli/main.py``. Names that still live in main are imported lazily at call time.
"""

import contextlib
import shutil
import subprocess
import sys

from hermes_cli.cli_output import line_input
from hermes_cli.model_setup_flows_common import _say


def _err(msg: str) -> None:
    print(msg, file=sys.stderr)


def _yes_no(prompt: str) -> bool:
    """``[y/N]`` prompt; Ctrl-C/EOF counts as "no"."""
    try:
        response = input(prompt).strip()
    except (EOFError, KeyboardInterrupt):
        response = "n"
    return response.lower() in {"y", "yes"}


def _whatsapp_choose_mode(get_env_value, save_env_value):
    """Step 1 of ``hermes whatsapp``: ``"bot"`` / ``"self-chat"``, or None when cancelled."""
    current_mode = get_env_value("WHATSAPP_MODE") or ""
    if current_mode:
        mode_label = "separate bot number" if current_mode == "bot" else "personal number (self-chat)"
        print(f"\n✓ Mode: {mode_label}")
        return current_mode
    _say("", "How will you use WhatsApp with Hermes?", "",
         "  1. Separate bot number (recommended)",
         "     People message the bot's number directly — cleanest experience.",
         "     Requires a second phone number with WhatsApp installed on a device.", "",
         "  2. Personal number (self-chat)",
         "     You message yourself to talk to the agent.",
         "     Quick to set up, but the UX is less intuitive.", "")
    try:
        choice = input("  Choose [1/2]: ").strip()
    except (EOFError, KeyboardInterrupt):
        print("\nSetup cancelled.")
        return None
    if choice == "1":
        save_env_value("WHATSAPP_MODE", "bot")
        _say("  ✓ Mode: separate bot number", "",
             "  ┌─────────────────────────────────────────────────┐",
             "  │  Getting a second number for the bot:           │",
             "  │                                                 │",
             "  │  Easiest: Install WhatsApp Business (free app)  │",
             "  │  on your phone with a second number:            │",
             "  │    • Dual-SIM: use your 2nd SIM slot            │",
             "  │    • Google Voice: free US number (voice.google) │",
             "  │    • Prepaid SIM: $3-10, verify once            │",
             "  │                                                 │",
             "  │  WhatsApp Business runs alongside your personal │",
             "  │  WhatsApp — no second phone needed.             │",
             "  └─────────────────────────────────────────────────┘")
        return "bot"
    save_env_value("WHATSAPP_MODE", "self-chat")
    print("  ✓ Mode: personal number (self-chat)")
    return "self-chat"


def _whatsapp_allowed_users(wa_mode: str, get_env_value, save_env_value) -> None:
    """Step 3 of ``hermes whatsapp``: show / set WHATSAPP_ALLOWED_USERS."""
    current_users = get_env_value("WHATSAPP_ALLOWED_USERS") or ""
    if current_users:
        print(f"✓ Allowed users: {current_users}")
        if not _yes_no("\n  Update allowed users? [y/N] "):
            return
        if wa_mode == "bot":
            phone = line_input("  Phone numbers that can message the bot (comma-separated): ").strip()
        else:
            phone = line_input("  Your phone number (e.g. 15551234567): ").strip()
        if phone:
            save_env_value("WHATSAPP_ALLOWED_USERS", phone.replace(" ", ""))
            print(f"  ✓ Updated to: {phone}")
        return
    print()
    if wa_mode == "bot":
        print("  Who should be allowed to message the bot?")
        phone = line_input("  Phone numbers (comma-separated, or * for anyone): ").strip()
    else:
        phone = line_input("  Your phone number (e.g. 15551234567): ").strip()
    if phone:
        save_env_value("WHATSAPP_ALLOWED_USERS", phone.replace(" ", ""))
        print(f"  ✓ Allowed users set: {phone}")
    else:
        print("  ⚠ No allowlist — the agent will respond to ALL incoming messages")


def _whatsapp_install_bridge(bridge_dir) -> bool:
    """Step 4 of ``hermes whatsapp``: ``npm install`` the bridge when needed. False = stop."""
    from hermes_constants import find_node_executable, with_hermes_node_path
    if (bridge_dir / "node_modules").exists():
        print("✓ Bridge dependencies already installed")
        return True
    print("\n→ Installing WhatsApp bridge dependencies (this can take a few minutes)...")
    import pm

    npm = find_node_executable("npm")
    try:
        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", "npm binary is missing after preparation")
            npm = str(installed.binary)
        result = subprocess.run(
            [npm, "install", "--no-fund", "--no-audit", "--progress=false"],
            cwd=str(bridge_dir), stdout=subprocess.DEVNULL, stderr=subprocess.PIPE, text=True,
            encoding="utf-8", errors="replace", env=env)
    except (pm.InstallError, OSError) as exc:
        print(f"  ✗ Bridge dependency preparation failed: {exc}")
        return False
    except KeyboardInterrupt:
        print("\n  ✗ Install cancelled")
        return False
    if result.returncode != 0:
        err = (result.stderr or "").strip()
        preview = "\n".join(err.splitlines()[-30:]) if err else "(no output)"
        _say("  ✗ npm install failed:", preview)
        return False
    print("  ✓ Dependencies installed")
    return True


def cmd_whatsapp(args):
    """Set up WhatsApp: choose mode, configure, install bridge, pair via QR."""
    from hermes_cli.main import _require_tty, get_hermes_home
    _require_tty("whatsapp")
    from hermes_cli.config import get_env_value, save_env_value
    from hermes_constants import find_node_executable, with_hermes_node_path
    _say("", "☤ WhatsApp Setup", "=" * 50)

    wa_mode = _whatsapp_choose_mode(get_env_value, save_env_value)
    if wa_mode is None:
        return

    # WHATSAPP_ENABLED=true is deliberately NOT written here: an aborted wizard (Ctrl+C, failed npm
    # install, missed QR scan) would leave .env claiming WhatsApp is ready with no creds.json, and
    # every `hermes gateway` would pay a 30s bridge timeout + indefinite retries. Set only after
    # pairing succeeds; prior successful pairings stay enabled.
    print()
    if (get_env_value("WHATSAPP_ENABLED") or "").lower() == "true":
        print("✓ WhatsApp is already enabled")

    _whatsapp_allowed_users(wa_mode, get_env_value, save_env_value)

    from gateway.platforms.whatsapp_common import resolve_whatsapp_bridge_dir
    bridge_dir = resolve_whatsapp_bridge_dir()
    bridge_script = bridge_dir / "bridge.js"
    if not bridge_script.exists():
        print(f"\n✗ Bridge script not found at {bridge_script}")
        return
    if not _whatsapp_install_bridge(bridge_dir):
        return

    # Existing session: re-pair or keep.
    session_dir = get_hermes_home() / "whatsapp" / "session"
    session_dir.mkdir(parents=True, exist_ok=True)
    if (session_dir / "creds.json").exists():
        print("✓ Existing WhatsApp session found")
        if _yes_no("\n  Re-pair? This will clear the existing session. [y/N] "):
            shutil.rmtree(session_dir, ignore_errors=True)
            session_dir.mkdir(parents=True, exist_ok=True)
            print("  ✓ Session cleared")
        else:
            # Older installs may have lost WHATSAPP_ENABLED; a kept pairing re-asserts it.
            if (get_env_value("WHATSAPP_ENABLED") or "").lower() != "true":
                save_env_value("WHATSAPP_ENABLED", "true")
            _say("\n✓ WhatsApp is configured and paired!", "  Start the gateway with: hermes gateway")
            return

    # QR code pairing
    _say("", "─" * 50)
    if wa_mode == "bot":
        _say("📱 Open WhatsApp (or WhatsApp Business) on the", "   phone with the BOT's number, then scan:")
    else:
        print("📱 Open WhatsApp on your phone, then scan:")
    _say("", "   Settings → Linked Devices → Link a Device", "─" * 50, "")
    import pm

    node = find_node_executable("node")
    if node is None:
        try:
            pm.ensure("node", explicit=True)
            installed = pm.installed_package("node")
            if installed is None or installed.binary is None:
                raise pm.InstallError("node", "Node.js binary is missing after preparation")
            node = str(installed.binary)
        except pm.InstallError as exc:
            print(f"  ✗ Node.js preparation failed: {exc}")
            return
    with contextlib.suppress(KeyboardInterrupt):
        subprocess.run(
            [node, str(bridge_script), "--pair-only", "--session", str(session_dir)],
            cwd=str(bridge_dir), env=with_hermes_node_path())

    print()
    if not (session_dir / "creds.json").exists():
        print("⚠ Pairing may not have completed. Run 'hermes whatsapp' to try again.")
        return
    # Only enable WhatsApp now that pairing actually succeeded (see above).
    save_env_value("WHATSAPP_ENABLED", "true")
    _say("✓ WhatsApp paired successfully!", "")
    if wa_mode == "bot":
        _say("  Next steps:", "    1. Start the gateway:  hermes gateway",
             "    2. Send a message to the bot's WhatsApp number",
             "    3. The agent will reply automatically", "",
             "  Tip: Agent responses are prefixed with '☤ Hermes Agent'")
    else:
        _say("  Next steps:", "    1. Start the gateway:  hermes gateway",
             "    2. Open WhatsApp → Message Yourself",
             "    3. Type a message — the agent will reply", "",
             "  Tip: Agent responses are prefixed with '☤ Hermes Agent'",
             "  so you can tell them apart from your own messages.")
    _say("", "  Or install as a service: hermes gateway install")


def cmd_whatsapp_cloud(args):
    """Set up WhatsApp Business Cloud API (official Meta integration) — complementary to the
    ``hermes whatsapp`` Baileys bridge wizard. See ``hermes_cli/setup_whatsapp_cloud.py``."""
    from hermes_cli.main import _require_tty
    _require_tty("whatsapp-cloud")
    from hermes_cli.setup_whatsapp_cloud import run_whatsapp_cloud_setup
    return run_whatsapp_cloud_setup()


def cmd_slack(args):
    """``hermes slack <subcommand>``; ``manifest`` prints or writes a Slack app manifest with
    every gateway command registered as a first-class slash."""
    sub = getattr(args, "slack_command", None)
    if sub in {None, ""}:
        _err("usage: hermes slack <subcommand>\n"
             "\n"
             "subcommands:\n"
             "  manifest   Generate a Slack app manifest with every gateway\n"
             "             command registered as a native slash\n"
             "\n"
             "Run `hermes slack manifest -h` for details.")
        return 1

    if sub == "manifest":
        from hermes_cli.slack_cli import slack_manifest_command
        status = slack_manifest_command(args)
        if status:
            raise SystemExit(status)
        return status

    _err(f"Unknown slack subcommand: {sub}")
    return 1