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pub mod collection;
pub mod interval;

use crate::collection::IntervalsCollection;
use crate::interval::Interval;

/// Provides non-intersecting integer subranges of initial range.

pub struct Subranges {
    free: IntervalsCollection,
}

impl Subranges {

    /// Creates `Self` with specified free range.

    pub fn new(range: Interval) -> Self {
        let mut free = IntervalsCollection::default();
        free.insert(range);
        Self { free }
    }

    /// Take free interval with specified `length` and returns it.

    /// If free interval with specified `length` doesn't exists, return None.

    pub fn take_free_subrange(&mut self, length: i64) -> Option<Interval> {
        assert!(length > 0, "Length must be >= 0");
        self.free.take_exact(length)
    }

    /// Free all filled intervals, that intersects with `subrange`.

    pub fn erase_subrange(&mut self, subrange: Interval) {
        self.free.insert(subrange)
    }
}