"""Command handlers: /start, /help; /start registers user."""

import asyncio

import config
from telegram import Update
from telegram.ext import CommandHandler, ContextTypes

from db.session import session_scope
from db.repository import get_or_create_user, set_user_phone
from utils.user import build_full_name


async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    if not update.message:
        return
    user = update.effective_user
    if not user:
        return
    full_name = build_full_name(user.first_name, user.last_name)
    telegram_user_id = user.id
    username = user.username
    first_name = user.first_name
    last_name = user.last_name

    def do_get_or_create() -> None:
        with session_scope(config.DATABASE_URL) as session:
            get_or_create_user(
                session,
                telegram_user_id=telegram_user_id,
                full_name=full_name,
                username=username,
                first_name=first_name,
                last_name=last_name,
            )

    await asyncio.get_running_loop().run_in_executor(None, do_get_or_create)

    text = "Привет! Я бот календаря дежурств. Используй /help для списка команд."
    await update.message.reply_text(text)


async def set_phone(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Set or clear phone for the current user (private chat only)."""
    if not update.message or not update.effective_user:
        return
    if update.effective_chat and update.effective_chat.type != "private":
        await update.message.reply_text("Команда /set_phone доступна только в личке.")
        return
    # Optional: restrict to allowed usernames; plan says "or without restrictions"
    args = context.args or []
    phone = " ".join(args).strip() if args else None
    telegram_user_id = update.effective_user.id

    def do_set_phone() -> str:
        with session_scope(config.DATABASE_URL) as session:
            full_name = build_full_name(
                update.effective_user.first_name, update.effective_user.last_name
            )
            get_or_create_user(
                session,
                telegram_user_id=telegram_user_id,
                full_name=full_name,
                username=update.effective_user.username,
                first_name=update.effective_user.first_name,
                last_name=update.effective_user.last_name,
            )
            user = set_user_phone(session, telegram_user_id, phone or None)
            if user is None:
                return "Ошибка сохранения."
            if phone:
                return f"Телефон сохранён: {phone}"
            return "Телефон очищен."

    result = await asyncio.get_running_loop().run_in_executor(None, do_set_phone)
    await update.message.reply_text(result)


async def help_cmd(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    if not update.message or not update.effective_user:
        return
    lines = [
        "Доступные команды:",
        "/start — Начать",
        "/help — Показать эту справку",
        "/set_phone — Указать или очистить телефон для отображения в дежурстве",
        "/pin_duty — В группе: закрепить сообщение о дежурстве (нужны права админа у бота)",
    ]
    if config.is_admin(update.effective_user.username or ""):
        lines.append("/import_duty_schedule — Импорт расписания дежурств (JSON)")
    await update.message.reply_text("\n".join(lines))


start_handler = CommandHandler("start", start)
help_handler = CommandHandler("help", help_cmd)
set_phone_handler = CommandHandler("set_phone", set_phone)