"""Telegram bot command handlers.

Registered via @bot_command decorator for auto-discovery.
"""

from __future__ import annotations

import logging
from typing import Any

from app.integrations.telegram.auth import create_link_token, get_bot_link_url
from app.integrations.telegram.decorators import bot_command
from app.integrations.telegram.client import TelegramBotClient

logger = logging.getLogger("voidea.telegram.handlers")

_bot_client: TelegramBotClient | None = None


def set_bot_client(client: TelegramBotClient) -> None:
    global _bot_client
    _bot_client = client


@bot_command(name="/start", description="Welcome message and getting started")
async def cmd_start(update: dict[str, Any], context: dict[str, Any]) -> str:
    user = update.get("message", {}).get("from", {})
    first_name = user.get("first_name", "User")
    return (
        f"Hello, {first_name}! 👋\n\n"
        "I'm VoIdeaAI bot. Here's what I can do:\n"
        "/link — Link your Telegram to VoIdea account\n"
        "/idea — Create a new idea (requires linking)\n"
        "/help — Show available commands"
    )


@bot_command(name="/help", description="Show available commands")
async def cmd_help(update: dict[str, Any], context: dict[str, Any]) -> str:
    return (
        "Available commands:\n"
        "/start — Welcome message\n"
        "/link — Link Telegram to your VoIdea account\n"
        "/idea — Create a new idea from text\n"
        "/help — This message\n\n"
        "To get started, use /link to connect your account."
    )


@bot_command(name="/link", description="Link Telegram to your VoIdea account")
async def cmd_link(update: dict[str, Any], context: dict[str, Any]) -> str:
    user_id = update.get("message", {}).get("from", {}).get("id")
    if not user_id:
        return "Error: could not identify you."

    token = create_link_token(int(user_id))
    base_url = context.get("base_url", "https://voidea.ai")
    link_url = get_bot_link_url(base_url, token)
    return (
        "To link your Telegram account to VoIdea:\n\n"
        f"1. Open this link: {link_url}\n"
        "2. Confirm the pairing\n"
        "3. Come back and use /idea to create ideas\n\n"
        "The link expires in 30 minutes."
    )


@bot_command(name="/idea", description="Create a new idea (requires linking)")
async def cmd_idea(update: dict[str, Any], context: dict[str, Any]) -> str:
    text = update.get("message", {}).get("text", "")
    args = text.replace("/idea", "", 1).strip()

    if not args:
        return (
            "Usage: /idea <your idea text>\n\n"
            "Example: /idea A mobile app for tracking daily water intake\n\n"
            "You need to link your account first with /link."
        )

    return (
        f"Idea received: \"{args[:200]}\"\n\n"
        "To save it permanently, link your account with /link first.\n"
        "After linking, your ideas will appear in your VoIdea dashboard."
    )