//@compile-flags: --test

#![allow(
    unused_mut,
    clippy::get_first,
    clippy::from_iter_instead_of_collect,
    clippy::useless_vec
)]
#![warn(clippy::unwrap_used)]
#![warn(clippy::get_unwrap)]

use std::collections::{BTreeMap, HashMap, VecDeque};

struct GetFalsePositive {
    arr: [u32; 3],
}

impl GetFalsePositive {
    fn get(&self, pos: usize) -> Option<&u32> {
        self.arr.get(pos)
    }
    fn get_mut(&mut self, pos: usize) -> Option<&mut u32> {
        self.arr.get_mut(pos)
    }
}

fn main() {
    let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
    let mut some_slice = &mut [0, 1, 2, 3];
    let mut some_vec = vec![0, 1, 2, 3];
    let mut some_vecdeque: VecDeque<_> = some_vec.iter().cloned().collect();
    let mut some_hashmap: HashMap<u8, char> = HashMap::from_iter(vec![(1, 'a'), (2, 'b')]);
    let mut some_btreemap: BTreeMap<u8, char> = BTreeMap::from_iter(vec![(1, 'a'), (2, 'b')]);
    let mut false_positive = GetFalsePositive { arr: [0, 1, 2] };

    {
        // Test `get().unwrap()`
        let _ = &boxed_slice[1];
        let _ = &some_slice[0];
        let _ = &some_vec[0];
        let _ = &some_vecdeque[0];
        let _ = &some_hashmap[&1];
        let _ = &some_btreemap[&1];
        #[allow(clippy::unwrap_used)]
        let _ = false_positive.get(0).unwrap();
        // Test with deref
        let _: u8 = boxed_slice[1];
    }

    {
        // Test `get_mut().unwrap()`
        boxed_slice[0] = 1;
        some_slice[0] = 1;
        some_vec[0] = 1;
        some_vecdeque[0] = 1;
        // Check false positives
        #[allow(clippy::unwrap_used)]
        {
            *some_hashmap.get_mut(&1).unwrap() = 'b';
            *some_btreemap.get_mut(&1).unwrap() = 'b';
            *false_positive.get_mut(0).unwrap() = 1;
        }
    }

    {
        // Test `get().unwrap().foo()` and `get_mut().unwrap().bar()`
        let _ = some_vec[0..1].to_vec();
        let _ = some_vec[0..1].to_vec();
    }
}

#[test]
fn test() {
    let boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
    let _ = &boxed_slice[1];
}

#[cfg(test)]
mod issue9612 {
    // should not lint in `#[cfg(test)]` modules
    #[test]
    fn test_fn() {
        let _a: u8 = 2.try_into().unwrap();
        let _a: u8 = 3.try_into().expect("");

        util();
    }

    fn util() {
        let _a: u8 = 4.try_into().unwrap();
        let _a: u8 = 5.try_into().expect("");
        // should still warn
        let _ = &Box::new([0])[1];
    }
}