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use crate::pubsub::InvalidOption;
use std::str::FromStr;

/// Access model options according to [XEP-0060 table 6](https://xmpp.org/extensions/xep-0060.html#table-6).
pub enum AccessModel {
    /// Any entity may subscribe to the node.
    Open,
    /// Any entity with a subscription of type "from" or "both" may subscribe to the node and retrieve items from the node
    Presence,
    /// Any entity in the specified roster group(s) may subscribe to the node and retrieve items from the node
    Roster,
    /// Node owner must approve subscription requests.
    Authorize,
    /// Only whitelisted entities may subscribes.
    Whitelist,
}

impl ToString for AccessModel {
    fn to_string(&self) -> String {
        match self {
            AccessModel::Open => "open",
            AccessModel::Presence => "presence",
            AccessModel::Roster => "roster",
            AccessModel::Authorize => "authorize",
            AccessModel::Whitelist => "whitelist",
        }
        .to_string()
    }
}

impl FromStr for AccessModel {
    type Err = InvalidOption;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "open" => Ok(AccessModel::Open),
            "presence" => Ok(AccessModel::Presence),
            "roster" => Ok(AccessModel::Roster),
            "authorize" => Ok(AccessModel::Authorize),
            "whitelist" => Ok(AccessModel::Whitelist),
            _ => Err(InvalidOption),
        }
    }
}