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use super::{DataPartitionProvider, DataPartitionProviderFeedback, PartSize};
use std::num::NonZeroU64;

/// 固定分片大小提供者
#[derive(Debug, Clone, Copy)]
pub struct FixedDataPartitionProvider(NonZeroU64);

impl Default for FixedDataPartitionProvider {
    #[inline]
    fn default() -> Self {
        Self(PartSize::default().into())
    }
}

impl FixedDataPartitionProvider {
    /// 创建固定分片大小提供者
    ///
    /// 如果传入 `0` 将返回 [`None`]。
    #[inline]
    pub fn new(part_size: u64) -> Option<Self> {
        NonZeroU64::new(part_size).map(Self::new_with_non_zero_part_size)
    }

    /// 创建固定分片大小提供者
    ///
    /// 提供 [`NonZeroU64`] 作为分片大小类型。
    #[inline]
    pub const fn new_with_non_zero_part_size(part_size: NonZeroU64) -> Self {
        Self(part_size)
    }

    /// 获取固定分片大小
    #[inline]
    pub const fn fixed_part_size(&self) -> NonZeroU64 {
        self.0
    }
}

impl DataPartitionProvider for FixedDataPartitionProvider {
    #[inline]
    fn part_size(&self) -> PartSize {
        self.0.into()
    }

    #[inline]
    fn feedback(&self, _feedback: DataPartitionProviderFeedback<'_>) {}
}

impl From<NonZeroU64> for FixedDataPartitionProvider {
    #[inline]
    fn from(part_size: NonZeroU64) -> Self {
        Self(part_size)
    }
}