pub use crate::service::util::{
    clamp_limit_offset, ensure_affected, merge_optional_text, parse_enum, required_text, role_level,
};

/// Maximum length for a channel name.
pub const MAX_CHANNEL_NAME: usize = 100;

/// Maximum length for a channel topic.
pub const MAX_CHANNEL_TOPIC: usize = 1024;

/// Maximum length for a message body.
pub const MAX_MESSAGE_BODY: usize = 4096;

/// Maximum length for an article title.
pub const MAX_ARTICLE_TITLE: usize = 256;

/// Maximum number of poll options.
pub const MAX_POLL_OPTIONS: usize = 10;

/// Maximum length for a poll option text.
pub const MAX_POLL_OPTION_TEXT: usize = 100;

/// Redis key prefix for typing indicators.
pub const TYPING_PREFIX: &str = "im:typing:";

/// Redis key prefix for user presence.
pub const PRESENCE_PREFIX: &str = "im:presence:";

/// Redis TTL for typing indicators (seconds).
pub const TYPING_TTL_SECS: usize = 8;

/// Redis TTL for presence heartbeats (seconds).
pub const PRESENCE_TTL_SECS: usize = 120;

/// Maximum length for generated slugs.
pub const MAX_SLUG_LEN: usize = 128;

/// Generate a slug from a title string.
pub fn slugify(title: &str) -> String {
    let slug: String = title
        .to_lowercase()
        .chars()
        .filter_map(|c| {
            if c.is_ascii_alphanumeric() {
                Some(c)
            } else if c.is_whitespace() || !c.is_ascii() {
                Some('-')
            } else {
                None
            }
        })
        .collect::<String>()
        .split('-')
        .filter(|s| !s.is_empty())
        .collect::<Vec<_>>()
        .join("-");

    let mut result = slug;
    result.truncate(MAX_SLUG_LEN);
    if result.ends_with('-') {
        result.pop();
    }
    result
}