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use std::marker;
use std::slice;

use crate::Match;

/// Iterate over YR_MATCH in a YR_MATCHES
///
/// # Implementation notes
///
/// See `yr_string_matches_foreach` in Yara.
pub struct MatchIterator<'a> {
    head: *const yara_sys::YR_MATCH,
    _marker: marker::PhantomData<&'a yara_sys::YR_MATCH>,
}

impl<'a> From<&'a yara_sys::YR_MATCHES> for MatchIterator<'a> {
    fn from(matches: &'a yara_sys::YR_MATCHES) -> MatchIterator<'a> {
        MatchIterator {
            head: matches.get_head(),
            _marker: marker::PhantomData::default(),
        }
    }
}

impl<'a> Iterator for MatchIterator<'a> {
    type Item = &'a yara_sys::YR_MATCH;

    fn next(&mut self) -> Option<Self::Item> {
        if !self.head.is_null() {
            let m = unsafe { &*self.head };
            self.head = m.next;
            Some(m)
        } else {
            None
        }
    }
}

impl<'a> From<&'a yara_sys::YR_MATCH> for Match {
    fn from(m: &yara_sys::YR_MATCH) -> Self {
        Match {
            offset: m.offset as usize,
            length: m.match_length as usize,
            data: Vec::from(unsafe { slice::from_raw_parts(m.data, m.data_length as usize) }),
        }
    }
}