//! Things that can be gotten with the `pam_get_item` function.

use crate::constants::InvalidEnum;
use num_derive::FromPrimitive;
use num_traits::FromPrimitive;
use std::ffi::c_int;

/// Identifies what is being gotten or set with `pam_get_item`
/// or `pam_set_item`.
#[derive(FromPrimitive)]
#[repr(i32)]
#[non_exhaustive] // because C could give us anything!
pub enum ItemType {
    /// The PAM service name.
    Service = 1,
    /// The user's login name.
    User = 2,
    /// The TTY name.
    Tty = 3,
    /// The remote host (if applicable).
    RemoteHost = 4,
    /// The conversation struct (not a CStr-based item).
    Conversation = 5,
    /// The authentication token (password).
    AuthTok = 6,
    /// The old authentication token (when changing passwords).
    OldAuthTok = 7,
    /// The remote user's name.
    RemoteUser = 8,
    /// The prompt shown when requesting a username.
    UserPrompt = 9,
    /// App-supplied function to override failure delays.
    FailDelay = 10,
    /// X display name.
    XDisplay = 11,
    /// X server authentication data.
    XAuthData = 12,
    /// The type of `pam_get_authtok`.
    AuthTokType = 13,
}

impl TryFrom<c_int> for ItemType {
    type Error = InvalidEnum<Self>;
    fn try_from(value: c_int) -> Result<Self, Self::Error> {
        Self::from_i32(value).ok_or(value.into())
    }
}

impl From<ItemType> for c_int {
    fn from(val: ItemType) -> Self {
        val as Self
    }
}