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use crate::impl_wrapper_from_type_conversion;
use codec::{Decode, Encode, MaxEncodedLen};

/// An incremental identifier.
#[derive(
    Encode, Decode, Debug, Clone, PartialEq, Eq, Copy, Default, Ord, PartialOrd, Hash, MaxEncodedLen,
)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[derive(scale_info_derive::TypeInfo)]
#[scale_info(omit_prefix)]
pub struct IncId(u32);

impl IncId {
    /// Creates new `IncId` equal to zero.
    pub fn new() -> Self {
        Self::default()
    }

    /// Increases `IncId` value returning next sequential identifier.
    pub fn inc(&mut self) -> &mut Self {
        self.0 += 1;
        self
    }

    pub fn is_zero(&self) -> bool {
        self.0 == 0
    }
}

impl Iterator for &'_ mut IncId {
    type Item = IncId;

    fn next(&mut self) -> Option<Self::Item> {
        Some(*self.inc())
    }
}

impl_wrapper_from_type_conversion! { from u8 => IncId }
impl_wrapper_from_type_conversion! { from u16 => IncId }
impl_wrapper_from_type_conversion! { from u32 => IncId }