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use crate::element::builders::SequenceBuilder;
use crate::element::iterators::ElementsIterator;
use crate::element::Element;
use crate::ion_data::{IonEq, IonOrd};
use std::cmp::Ordering;

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Sequence {
    elements: Vec<Element>,
}

impl Sequence {
    pub fn new<E: Into<Element>, I: IntoIterator<Item = E>>(elements: I) -> Sequence {
        let elements = elements.into_iter().map(|e| e.into()).collect();
        Sequence { elements }
    }

    pub fn builder() -> SequenceBuilder {
        SequenceBuilder::new()
    }

    pub fn clone_builder(&self) -> SequenceBuilder {
        SequenceBuilder::with_initial_elements(&self.elements)
    }

    pub fn elements(&self) -> ElementsIterator<'_> {
        ElementsIterator::new(&self.elements)
    }

    pub fn get(&self, index: usize) -> Option<&Element> {
        self.elements.get(index)
    }

    pub fn len(&self) -> usize {
        self.elements.len()
    }

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

impl AsRef<Sequence> for Sequence {
    fn as_ref(&self) -> &Sequence {
        self
    }
}

// This is more efficient than Sequence::new(), which will iterate over and convert each value to
// an Element for better ergonomics.
impl From<Vec<Element>> for Sequence {
    fn from(elements: Vec<Element>) -> Self {
        Sequence { elements }
    }
}

impl<'a> IntoIterator for &'a Sequence {
    type Item = &'a Element;
    // TODO: Change once `impl Trait` type aliases are stable
    // type IntoIter = impl Iterator<Item = &'a Element>;
    type IntoIter = ElementsIterator<'a>;

    fn into_iter(self) -> Self::IntoIter {
        self.elements()
    }
}

impl IonEq for Sequence {
    fn ion_eq(&self, other: &Self) -> bool {
        self.elements.ion_eq(&other.elements)
    }
}

impl IonOrd for Sequence {
    fn ion_cmp(&self, other: &Self) -> Ordering {
        self.elements.ion_cmp(&other.elements)
    }
}