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use std::collections::BTreeSet;

use crate::identity::credentials::as_query::AsQuery;

/// Indicates the type of user interaction that is required. Valid values are login, none,
/// consent, and select_account.
///
/// - **prompt=login** forces the user to enter their credentials on that request, negating single-sign on.
/// - **prompt=none** is the opposite. It ensures that the user isn't presented with any interactive prompt.
///     If the request can't be completed silently by using single-sign on, the Microsoft identity platform returns an interaction_required error.
/// - **prompt=consent** triggers the OAuth consent dialog after the user signs in, asking the user to
///     grant permissions to the app.
/// - **prompt=select_account** interrupts single sign-on providing account selection experience
///     listing all the accounts either in session or any remembered account or an option to choose to use a different account altogether.
#[derive(Clone, Debug, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub enum Prompt {
    #[default]
    None,
    /// The user will be prompted for credentials by the service.
    Login,
    /// The user will be prompted to consent even if consent was granted before.
    Consent,
    /// The user will be prompted with a list of accounts from which one can be selected
    /// for authentication.
    SelectAccount,
    /// Use only for federated users. Provides same functionality as prompt=none
    /// for managed users.
    AttemptNone,
}

impl AsRef<str> for Prompt {
    fn as_ref(&self) -> &'static str {
        match self {
            Prompt::None => "none",
            Prompt::Login => "login",
            Prompt::Consent => "consent",
            Prompt::SelectAccount => "select_account",
            Prompt::AttemptNone => "attempt_none",
        }
    }
}

impl IntoIterator for Prompt {
    type Item = Prompt;
    type IntoIter = std::vec::IntoIter<Self::Item>;

    fn into_iter(self) -> Self::IntoIter {
        vec![self].into_iter()
    }
}

impl AsQuery for Vec<Prompt> {
    fn as_query(&self) -> String {
        self.iter()
            .map(|s| s.as_ref())
            .collect::<Vec<&str>>()
            .join(" ")
    }
}

impl AsQuery for BTreeSet<Prompt> {
    fn as_query(&self) -> String {
        self.iter()
            .map(|s| s.as_ref())
            .collect::<Vec<&str>>()
            .join(" ")
    }
}