use alloy_primitives::BlockNumber;

/// The finished height of all `ExEx`'s.
#[derive(Debug, Clone, Copy)]
pub enum FinishedExExHeight {
    /// No `ExEx`'s are installed, so there is no finished height.
    NoExExs,
    /// Not all `ExExs` have emitted a `FinishedHeight` event yet.
    NotReady,
    /// The finished height of all `ExEx`'s.
    ///
    /// This is the lowest common denominator between all `ExEx`'s.
    ///
    /// This block is used to (amongst other things) determine what blocks are safe to prune.
    ///
    /// The number is inclusive, i.e. all blocks `<= finished_height` are safe to prune.
    Height(BlockNumber),
}

impl FinishedExExHeight {
    /// Returns `true` if not all `ExExs` have emitted a `FinishedHeight` event yet.
    pub const fn is_not_ready(&self) -> bool {
        matches!(self, Self::NotReady)
    }
}