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use std::ffi::{c_void, CStr, CString};
use std::fmt::Debug;
use std::hash::Hash;
use std::ops::{BitAnd, BitOr};
use std::ptr;
use crate::collections::base::Span;
use crate::collections::base::SpanSet;
use crate::collections::base::{Collection, impl_collection, impl_iterator};
use crate::errors::ParseError;
use super::float_span::FloatSpan;
use super::number_span_set::NumberSpanSet;
pub struct FloatSpanSet {
_inner: ptr::NonNull<meos_sys::SpanSet>,
}
impl Drop for FloatSpanSet {
fn drop(&mut self) {
unsafe {
libc::free(self._inner.as_ptr().cast::<c_void>());
}
}
}
impl Collection for FloatSpanSet {
impl_collection!(spanset, f64);
fn contains(&self, content: &f64) -> bool {
unsafe { meos_sys::contains_spanset_float(self.inner(), *content) }
}
}
impl SpanSet for FloatSpanSet {
type SpanType = FloatSpan;
type SubsetType = <Self as Collection>::Type;
fn inner(&self) -> *const meos_sys::SpanSet {
self._inner.as_ptr()
}
fn from_inner(inner: *mut meos_sys::SpanSet) -> Self {
Self {
_inner: ptr::NonNull::new(inner).expect("Null pointers not allowed"),
}
}
fn width(&self, ignore_gaps: bool) -> Self::Type {
unsafe { meos_sys::floatspanset_width(self.inner(), ignore_gaps) }
}
/// Return a new `FloatSpanSet` with the lower and upper bounds shifted by `delta`.
///
/// ## Arguments
/// * `delta` - The value to shift by.
///
/// ## Returns
/// A new `FloatSpanSet` instance.
///
/// ## Example
/// ```
/// # use meos::FloatSpanSet;
/// # use std::str::FromStr;
/// # use meos::SpanSet;
///
/// let span = FloatSpanSet::from_str("{[17.5, 18.5), [19.5, 20.5)}").unwrap();
/// let shifted_span = span.shift(5.0);
///
/// let expected_shifted_span =
/// FloatSpanSet::from_str("{[22.5, 23.5), [24.5, 25.5)}").unwrap();
/// assert_eq!(shifted_span, expected_shifted_span);
/// ```
fn shift(&self, delta: f64) -> FloatSpanSet {
self.shift_scale(Some(delta), None)
}
/// Return a new `FloatSpanSet` with the lower and upper bounds scaled so that the width is `width`.
///
/// ## Arguments
/// * `width` - The new width.
///
/// ## Returns
/// A new `FloatSpanSet` instance.
///
/// ## Example
/// ```
/// # use meos::FloatSpanSet;
/// # use std::str::FromStr;
/// # use meos::SpanSet;
///
/// let span = FloatSpanSet::from_str("{[17.5, 18.5), [19.5, 20.5)}").unwrap();
/// let scaled_span = span.scale(2.0);
///
/// let expected_scaled_span =
/// FloatSpanSet::from_str("{[17.5, 18.1666666666666666666666), [18.833333333333333333333, 19.5)}").unwrap();
/// assert_eq!(scaled_span, expected_scaled_span);
/// ```
fn scale(&self, width: f64) -> FloatSpanSet {
self.shift_scale(None, Some(width))
}
/// Return a new `FloatSpanSet` with the lower and upper bounds shifted by `delta` and scaled so that the width is `width`.
///
/// ## Arguments
/// * `delta` - The value to shift by.
/// * `width` - The new width.
///
/// ## Returns
/// A new `FloatSpanSet` instance.
///
/// ## Example
/// ```
/// # use meos::FloatSpanSet;
/// # use std::str::FromStr;
/// # use meos::SpanSet;
///
/// let span = FloatSpanSet::from_str("{[17.5, 18.5), [19.5, 20.5)}").unwrap();
/// let shifted_scaled_span = span.shift_scale(Some(5.0), Some(2.5));
///
/// let expected_shifted_scaled_span =
/// FloatSpanSet::from_str("{[22.5, 23.3333333333333333333), [24.16666666666666666, 25)}").unwrap();
/// assert_eq!(shifted_scaled_span, expected_shifted_scaled_span);
/// ```
fn shift_scale(&self, delta: Option<f64>, width: Option<f64>) -> FloatSpanSet {
let d = delta.unwrap_or(0.0);
let w = width.unwrap_or(0.0);
let modified = unsafe {
meos_sys::floatspanset_shift_scale(self.inner(), d, w, delta.is_some(), width.is_some())
};
FloatSpanSet::from_inner(modified)
}
/// Calculates the distance between this `FloatSpanSet` and an integer (`value`).
///
/// ## Arguments
/// * `value` - An f64 to calculate the distance to.
///
/// ## Returns
/// An `f64` representing the distance between the span set and the value.
///
/// ## Example
/// ```
/// # use meos::FloatSpanSet;
/// # use meos::SpanSet;
/// let span_set: FloatSpanSet = [(2019.0..2023.5).into(), (2029.0..2030.5).into()].iter().collect();
/// let distance = span_set.distance_to_value(&2032.5);
/// assert_eq!(distance, 2.0);
/// ```
fn distance_to_value(&self, other: &Self::Type) -> f64 {
unsafe { meos_sys::distance_spanset_float(self.inner(), *other) }
}
/// Calculates the distance between this `FloatSpanSet` and another `FloatSpanSet`.
///
/// ## Arguments
/// * `other` - An `FloatSpanSet` to calculate the distance to.
///
/// ## Returns
/// An `f64` representing the distance between the two spansets.
///
/// ## Example
/// ```
/// # use meos::FloatSpanSet;
/// # use meos::SpanSet;
/// # use meos::Span;
///
/// let span_set1: FloatSpanSet = [(2019.0..2023.5).into(), (2029.0..2030.5).into()].iter().collect();
/// let span_set2: FloatSpanSet = [(2049.0..2050.5).into(), (2059.0..2600.5).into()].iter().collect();
/// let distance = span_set1.distance_to_span_set(&span_set2);
///
/// assert_eq!(distance, 18.5);
fn distance_to_span_set(&self, other: &Self) -> f64 {
unsafe { meos_sys::distance_floatspanset_floatspanset(self.inner(), other.inner()) }
}
/// Calculates the distance between this `FloatSpanSet` and a `FloatSpan`.
///
/// ## Arguments
/// * `other` - A `FloatSpan` to calculate the distance to.
///
/// ## Returns
/// A `TimeDelta` representing the distance in seconds between the span set and the span.
///
/// ## Example
/// ```
/// # use meos::FloatSpanSet;
/// # use meos::SpanSet;
/// # use meos::DateSpan;
/// # use meos::Span;
/// # use meos::FloatSpan;
///
/// let span_set: FloatSpanSet = [(2019.0..2023.5).into(), (2029.0..2030.5).into()].iter().collect();
/// let span: FloatSpan = (2009.0..2013.5).into();
/// let distance = span_set.distance_to_span(&span);
/// assert_eq!(distance, 5.5);
/// ```
fn distance_to_span(&self, span: &Self::SpanType) -> Self::SubsetType {
unsafe { meos_sys::distance_floatspanset_floatspan(self.inner(), span.inner()) }
}
}
impl NumberSpanSet for FloatSpanSet {}
impl Clone for FloatSpanSet {
fn clone(&self) -> FloatSpanSet {
self.copy()
}
}
impl_iterator!(FloatSpanSet);
impl Hash for FloatSpanSet {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
let hash = unsafe { meos_sys::spanset_hash(self.inner()) };
state.write_u32(hash);
let _ = state.finish();
}
}
impl std::str::FromStr for FloatSpanSet {
type Err = ParseError;
fn from_str(string: &str) -> Result<Self, Self::Err> {
CString::new(string).map_err(|_| ParseError).map(|string| {
let inner = unsafe { meos_sys::floatspanset_in(string.as_ptr()) };
Self::from_inner(inner)
})
}
}
impl std::cmp::PartialEq for FloatSpanSet {
fn eq(&self, other: &Self) -> bool {
unsafe { meos_sys::spanset_eq(self.inner(), other.inner()) }
}
}
impl Debug for FloatSpanSet {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let out_str = unsafe { meos_sys::floatspanset_out(self.inner(), 3) };
let c_str = unsafe { CStr::from_ptr(out_str) };
let str = c_str.to_str().map_err(|_| std::fmt::Error)?;
let result = f.write_str(str);
unsafe { libc::free(out_str.cast::<c_void>()) };
result
}
}
impl BitAnd<FloatSpanSet> for FloatSpanSet {
type Output = Option<FloatSpanSet>;
/// Computes the intersection of two `FloatSpanSet`s.
///
/// ## Arguments
///
/// * `other` - Another `FloatSpanSet` to intersect with.
///
/// ## Returns
///
/// * `Some(FloatSpanSet)` - A new `FloatSpanSet` containing the intersection, if it exists.
/// * `None` - If the intersection is empty.
///
/// ## Example
///
/// ```
/// # use meos::FloatSpanSet;
/// # use std::str::FromStr;
/// # use meos::SpanSet;
///
/// let span_set1 = FloatSpanSet::from_str("{[17.5, 18.5), [19.5, 20.5)}").unwrap();
/// let span_set2 = FloatSpanSet::from_str("{[19.5, 23.5), [45.5, 67.5)}").unwrap();
///
/// let expected_result = FloatSpanSet::from_str("{[19.5, 20.5)}").unwrap();
/// assert_eq!((span_set1 & span_set2).unwrap(), expected_result);
/// ```
fn bitand(self, other: FloatSpanSet) -> Self::Output {
self.intersection(&other)
}
}
impl BitOr for FloatSpanSet {
type Output = Option<FloatSpanSet>;
/// Computes the union of two `FloatSpanSet`s.
///
/// ## Arguments
///
/// * `other` - Another `FloatSpanSet` to union with.
///
/// ## Returns
///
/// * `Some(FloatSpanSet)` - A new `FloatSpanSet` containing the union.
/// * `None` - If the union is empty.
///
/// ## Example
///
/// ```
/// # use meos::FloatSpanSet;
/// # use std::str::FromStr;
/// # use meos::SpanSet;
///
/// let span_set1 = FloatSpanSet::from_str("{[17.5, 18.5), [19.5, 20.5)}").unwrap();
/// let span_set2 = FloatSpanSet::from_str("{[19.5, 23.5), [45.5, 67.5)}").unwrap();
///
/// let expected_result = FloatSpanSet::from_str("{[17.5, 18.5), [19.5, 23.5), [45.5, 67.5)}").unwrap();
/// assert_eq!((span_set1 | span_set2).unwrap(), expected_result)
/// ```
fn bitor(self, other: Self) -> Self::Output {
self.union(&other)
}
}