"""WhatsApp adapter for Echo Core — connects to Node.js bridge."""

import asyncio
import logging

import httpx

from src.config import Config
from src.router import route_message
from src.claude_session import clear_session, get_active_session

log = logging.getLogger("echo-core.whatsapp")
_security_log = logging.getLogger("echo-core.security")

# Module-level config reference, set by run_whatsapp()
_config: Config | None = None
_bridge_url: str = "http://127.0.0.1:8098"
_running: bool = False

VALID_MODELS = {"opus", "sonnet", "haiku"}


def _get_config() -> Config:
    """Return the module-level config, raising if not initialized."""
    if _config is None:
        raise RuntimeError("WhatsApp adapter not initialized — call run_whatsapp() first")
    return _config


# --- Authorization helpers ---


def is_owner(phone: str) -> bool:
    """Check if phone number matches config whatsapp.owner."""
    owner = _get_config().get("whatsapp.owner")
    return phone == str(owner) if owner else False


def is_admin(phone: str) -> bool:
    """Check if phone number is owner or in whatsapp admins list."""
    if is_owner(phone):
        return True
    admins = _get_config().get("whatsapp.admins", [])
    return phone in admins


def is_registered_chat(chat_id: str) -> bool:
    """Check if a WhatsApp chat is in any registered channel entry."""
    channels = _get_config().get("whatsapp_channels", {})
    return any(ch.get("id") == chat_id for ch in channels.values())


# --- Message splitting helper ---


def split_message(text: str, limit: int = 4096) -> list[str]:
    """Split text into chunks that fit WhatsApp's message limit."""
    if len(text) <= limit:
        return [text]

    chunks = []
    while text:
        if len(text) <= limit:
            chunks.append(text)
            break
        split_at = text.rfind("\n", 0, limit)
        if split_at == -1:
            split_at = limit
        chunks.append(text[:split_at])
        text = text[split_at:].lstrip("\n")
    return chunks


# --- Bridge communication ---


async def poll_messages(client: httpx.AsyncClient) -> list[dict]:
    """Poll bridge for new messages."""
    try:
        resp = await client.get(f"{_bridge_url}/messages", timeout=10)
        if resp.status_code == 200:
            data = resp.json()
            return data.get("messages", [])
    except Exception as e:
        log.debug("Bridge poll error: %s", e)
    return []


async def send_whatsapp(client: httpx.AsyncClient, to: str, text: str) -> bool:
    """Send a message via the bridge."""
    try:
        for chunk in split_message(text):
            resp = await client.post(
                f"{_bridge_url}/send",
                json={"to": to, "text": chunk},
                timeout=30,
            )
            if resp.status_code != 200 or not resp.json().get("ok"):
                log.error("Failed to send to %s: %s", to, resp.text)
                return False
        return True
    except Exception as e:
        log.error("Send error: %s", e)
        return False


async def get_bridge_status(client: httpx.AsyncClient) -> dict | None:
    """Get bridge connection status."""
    try:
        resp = await client.get(f"{_bridge_url}/status", timeout=5)
        if resp.status_code == 200:
            return resp.json()
    except Exception:
        pass
    return None


# --- Message handler ---


async def handle_incoming(msg: dict, client: httpx.AsyncClient) -> None:
    """Process a single incoming WhatsApp message."""
    sender = msg.get("from", "")
    text = msg.get("text", "").strip()
    push_name = msg.get("pushName", "unknown")
    is_group = msg.get("isGroup", False)

    if not text:
        return

    # Group chat: only registered chats
    if is_group:
        group_jid = sender  # group JID like 123456@g.us
        if not is_registered_chat(group_jid):
            return
        # Use group JID as channel ID
        channel_id = f"wa-{group_jid.split('@')[0]}"
    else:
        # Private chat: check admin
        phone = sender.split("@")[0]
        if not is_admin(phone):
            _security_log.warning(
                "Unauthorized WhatsApp DM from %s (%s): %.100s",
                phone, push_name, text,
            )
            return
        channel_id = f"wa-{phone}"

    # Handle slash commands locally for immediate response
    if text.startswith("/"):
        cmd = text.split()[0].lower()
        if cmd == "/clear":
            cleared = clear_session(channel_id)
            reply = "Session cleared." if cleared else "No active session."
            await send_whatsapp(client, sender, reply)
            return
        if cmd == "/status":
            session = get_active_session(channel_id)
            if session:
                model = session.get("model", "?")
                sid = session.get("session_id", "?")[:8]
                count = session.get("message_count", 0)
                in_tok = session.get("total_input_tokens", 0)
                out_tok = session.get("total_output_tokens", 0)
                reply = (
                    f"Model: {model}\n"
                    f"Session: {sid}\n"
                    f"Messages: {count}\n"
                    f"Tokens: {in_tok} in / {out_tok} out"
                )
            else:
                reply = "No active session."
            await send_whatsapp(client, sender, reply)
            return

    # Identify sender for logging/routing
    participant = msg.get("participant") or sender
    user_id = participant.split("@")[0]

    # Route to Claude via router (handles /model and regular messages)
    log.info("Message from %s (%s): %.50s", user_id, push_name, text)
    try:
        response, _is_cmd = await asyncio.to_thread(
            route_message, channel_id, user_id, text
        )
        await send_whatsapp(client, sender, response)
    except Exception as e:
        log.error("Error handling message from %s: %s", user_id, e)
        await send_whatsapp(client, sender, "Sorry, an error occurred.")


# --- Main loop ---


async def run_whatsapp(config: Config, bridge_url: str = "http://127.0.0.1:8098"):
    """Main WhatsApp polling loop."""
    global _config, _bridge_url, _running
    _config = config
    _bridge_url = bridge_url
    _running = True

    log.info("WhatsApp adapter starting (bridge: %s)", bridge_url)

    async with httpx.AsyncClient() as client:
        # Wait for bridge to be ready
        retries = 0
        while _running and retries < 30:
            status = await get_bridge_status(client)
            if status:
                if status.get("connected"):
                    log.info("WhatsApp bridge connected (phone: %s)", status.get("phone"))
                    break
                else:
                    qr = "QR available" if status.get("qr") else "waiting"
                    log.info("WhatsApp bridge not connected yet (%s)", qr)
            else:
                log.info("WhatsApp bridge not reachable, retrying...")
            retries += 1
            await asyncio.sleep(5)

        if not _running:
            return

        log.info("WhatsApp adapter polling started")

        # Polling loop
        while _running:
            try:
                messages = await poll_messages(client)
                for msg in messages:
                    await handle_incoming(msg, client)
            except asyncio.CancelledError:
                break
            except Exception as e:
                log.error("Polling error: %s", e)
            await asyncio.sleep(2)

    log.info("WhatsApp adapter stopped")


def stop_whatsapp():
    """Signal the polling loop to stop."""
    global _running
    _running = False