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use crate::*;

/// Iterator over Imaged images
pub struct Iter<'a>(pub(crate) *mut sys::ImagedIter, pub(crate) &'a DB);

/// Iterator over Imaged keys
pub struct KeyIter<'a>(pub(crate) *mut sys::ImagedIter, pub(crate) &'a DB);

impl<'a> Drop for Iter<'a> {
    fn drop(&mut self) {
        unsafe { sys::imagedIterFree(self.0) }
    }
}

impl<'a> Drop for KeyIter<'a> {
    fn drop(&mut self) {
        unsafe { sys::imagedIterFree(self.0) }
    }
}

impl<'a> Iter<'a> {
    pub fn reset(&mut self) {
        unsafe { sys::imagedIterReset(self.0) }
    }
}

impl<'a> KeyIter<'a> {
    pub fn reset(&mut self) {
        unsafe { sys::imagedIterReset(self.0) }
    }
}

impl<'a> Iterator for Iter<'a> {
    type Item = (&'a str, Image<'a>);

    fn next(&mut self) -> Option<Self::Item> {
        let iter = unsafe { &*self.0 };
        let ptr = unsafe { sys::imagedIterNext(self.0) };
        if ptr.is_null() || iter.key.is_null() {
            return None;
        }

        unsafe {
            let image = &mut *ptr;
            let key = std::slice::from_raw_parts(iter.key as *const u8, iter.keylen as usize);
            let key = std::str::from_utf8(key).expect("Invalid key");

            Some((key, Image(image, false, std::marker::PhantomData)))
        }
    }
}

impl<'a> Iterator for KeyIter<'a> {
    type Item = &'a str;

    fn next(&mut self) -> Option<Self::Item> {
        let key = unsafe { sys::imagedIterNextKey(self.0) };
        if key.is_null() {
            return None;
        }

        unsafe {
            let key = std::slice::from_raw_parts(key as *const u8, (*self.0).keylen as usize);
            let key = std::str::from_utf8_unchecked(key);
            Some(key)
        }
    }
}