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use std::ops::Drop;

use supercow::{Phantomcow, Supercow};
use utils::StreamingIterator;

use ffi;
use thread::ThreadOwner;
use Thread;

pub trait ThreadsOwner {}

#[derive(Debug)]
pub(crate) struct ThreadsPtr {
    pub ptr: *mut ffi::notmuch_threads_t,
}

impl Drop for ThreadsPtr {
    fn drop(&mut self) {
        unsafe { ffi::notmuch_threads_destroy(self.ptr) };
    }
}

#[derive(Debug)]
pub struct Threads<'o, Owner: ThreadsOwner + 'o> {
    handle: ThreadsPtr,
    marker: Phantomcow<'o, Owner>,
}

impl<'o, Owner: ThreadsOwner + 'o> ThreadOwner for Threads<'o, Owner> {}

impl<'o, Owner: ThreadsOwner + 'o> Threads<'o, Owner> {
    pub fn from_ptr<O: Into<Phantomcow<'o, Owner>>>(
        ptr: *mut ffi::notmuch_threads_t,
        owner: O,
    ) -> Threads<'o, Owner> {
        Threads {
            handle: ThreadsPtr { ptr },
            marker: owner.into(),
        }
    }
}

impl<'s, 'o: 's, Owner: ThreadsOwner + 'o> StreamingIterator<'s, Thread<'s, Self>>
    for Threads<'o, Owner>
{
    fn next(&'s mut self) -> Option<Thread<'s, Self>> {
        let valid = unsafe { ffi::notmuch_threads_valid(self.handle.ptr) };

        if valid == 0 {
            return None;
        }

        let cthread = unsafe {
            let t = ffi::notmuch_threads_get(self.handle.ptr);
            ffi::notmuch_threads_move_to_next(self.handle.ptr);
            t
        };

        Some(Thread::from_ptr(cthread, Supercow::borrowed(self)))
    }
}

unsafe impl<'o, Owner: ThreadsOwner + 'o> Send for Threads<'o, Owner> {}
unsafe impl<'o, Owner: ThreadsOwner + 'o> Sync for Threads<'o, Owner> {}