START = (
    "🔐 VPN Control Panel Bot\n\n"
    "Manage users, subscriptions, and servers.\n"
    "Use /help to see available commands."
)

HELP = (
    "📋 Available commands:\n\n"
    "👤 Users\n"
    "/users - list all active users\n"
    "/user <id> - show user details\n"
    "/delete <id> - deactivate user\n\n"
    "📅 Subscriptions\n"
    "/renew <id> - check subscription info\n"
    "/expired - list expired subscriptions\n"
    "/expiring [days] - list expiring in N days\n\n"
    "📊 System\n"
    "/stats - system statistics\n"
    "/help - this message"
)

USER_NOT_FOUND = "❌ User <code>{}</code> not found."
ADMIN_ONLY = "⛔ Access denied. Admins only."
INVALID_ARGS = "⚠️ Invalid arguments. Usage: <code>{}</code>"
ERROR = "❌ Error: {}"
NO_DATA = "📭 No data."


def user_info(
    user_id: int,
    telegram_id: int,
    username: str | None,
    full_name: str,
    is_active: bool,
    created_at: str,
    subscription_active: bool,
    tariff_name: str | None,
    remaining_days: int,
) -> str:
    status = "✅ Active" if is_active else "❌ Deactivated"
    sub_status = "✅ Active" if subscription_active else "❌ Inactive"
    lines = [
        f"👤 <b>User #{user_id}</b>",
        f"📍 Telegram ID: <code>{telegram_id}</code>",
        f"👋 Username: @{username or '—'}",
        f"📛 Name: {full_name}",
        f"🔵 Status: {status}",
        f"📅 Registered: {created_at}",
        "",
        f"📦 <b>Subscription</b>",
        f"Status: {sub_status}",
    ]
    if tariff_name:
        lines.append(f"Plan: {tariff_name}")
    if subscription_active:
        lines.append(f"Days left: {remaining_days}")
    return "\n".join(lines)


def user_short(user_id: int, telegram_id: int, username: str | None) -> str:
    name = f"@{username}" if username else f"<code>{telegram_id}</code>"
    return f"  #{user_id} {name}"


def expired_list(items: list[dict]) -> str:
    if not items:
        return "✅ No expired subscriptions."
    lines = ["⚠️ <b>Expired subscriptions:</b>", ""]
    for item in items:
        lines.append(
            f"  #{item['user_id']} tg:{item['telegram_id']} — "
            f"expired {item['tariff_name']}"
        )
    return "\n".join(lines)


def expiring_list(items: list[dict], days: int) -> str:
    if not items:
        return f"✅ No subscriptions expiring within {days} days."
    lines = [f"⚠️ <b>Expiring within {days} days:</b>", ""]
    for item in items:
        lines.append(
            f"  #{item['user_id']} tg:{item['telegram_id']} — "
            f"{item['remaining_days']}d left ({item['tariff_name']})"
        )
    return "\n".join(lines)


def stats_text(
    total_users: int,
    active_users: int,
    total_tariffs: int,
    total_servers: int,
    active_servers: int,
    total_payments: int,
    confirmed_payments: int,
    total_revenue: float,
) -> str:
    return (
        "📊 <b>System Statistics</b>\n\n"
        f"👥 Users: {active_users} / {total_users} active\n"
        f"📦 Tariffs: {total_tariffs}\n"
        f"🖥️ Servers: {active_servers} / {total_servers} active\n"
        f"💳 Payments: {confirmed_payments} / {total_payments} confirmed\n"
        f"💰 Revenue: {total_revenue:.2f} RUB"
    )