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use expect_test::expect;

use crate::tests::{check_infer, check_no_mismatches};

#[test]
fn opaque_generics() {
    check_infer(
        r#"
//- minicore: iterator
pub struct Grid {}

impl<'a> IntoIterator for &'a Grid {
    type Item = &'a ();

    type IntoIter = impl Iterator<Item = &'a ()>;

    fn into_iter(self) -> Self::IntoIter {
    }
}
    "#,
        expect![[r#"
            150..154 'self': &'a Grid
            174..181 '{     }': impl Iterator<Item = &'a ()>
        "#]],
    );
}

#[test]
fn normalization() {
    check_infer(
        r#"
//- minicore: iterator, iterators
fn main() {
    _ = [0i32].into_iter().filter_map(|_n| Some(1i32));
}
    "#,
        expect![[r#"
            10..69 '{     ...2)); }': ()
            16..17 '_': FilterMap<IntoIter<i32, 1>, impl FnMut(i32) -> Option<i32>>
            16..66 '_ = [0...1i32))': ()
            20..26 '[0i32]': [i32; 1]
            20..38 '[0i32]...iter()': IntoIter<i32, 1>
            20..66 '[0i32]...1i32))': FilterMap<IntoIter<i32, 1>, impl FnMut(i32) -> Option<i32>>
            21..25 '0i32': i32
            50..65 '|_n| Some(1i32)': impl FnMut(i32) -> Option<i32>
            51..53 '_n': i32
            55..59 'Some': fn Some<i32>(i32) -> Option<i32>
            55..65 'Some(1i32)': Option<i32>
            60..64 '1i32': i32
        "#]],
    );
}

#[test]
fn regression_20487() {
    check_no_mismatches(
        r#"
//- minicore: coerce_unsized, dispatch_from_dyn
trait Foo {
    fn bar(&self) -> u32 {
        0xCAFE
    }
}

fn debug(_: &dyn Foo) {}

impl Foo for i32 {}

fn main() {
    debug(&1);
}"#,
    );
}

#[test]
fn projection_is_not_associated_type() {
    check_no_mismatches(
        r#"
//- minicore: fn
trait Iterator {
    type Item;

    fn partition<F>(self, f: F)
    where
        F: FnMut(&Self::Item) -> bool,
    {
    }
}

struct Iter;
impl Iterator for Iter {
    type Item = i32;
}

fn main() {
    Iter.partition(|n| true);
}
    "#,
    );
}

#[test]
fn cast_error_type() {
    check_infer(
        r#"
fn main() {
  let foo: [_; _] = [false] as _;
}
    "#,
        expect![[r#"
            10..47 '{   le...s _; }': ()
            18..21 'foo': [bool; 1]
            32..39 '[false]': [bool; 1]
            32..44 '[false] as _': [bool; 1]
            33..38 'false': bool
        "#]],
    );
}

#[test]
fn no_infinite_loop_on_super_predicates_elaboration() {
    check_infer(
        r#"
//- minicore: sized
trait DimMax<Other: Dimension> {
    type Output: Dimension;
}

trait Dimension: DimMax<<Self as Dimension>:: Smaller, Output = Self> {
    type Smaller: Dimension;
}

fn test<T, U>(t: T)
where
    T: DimMax<U>,
    U: Dimension,
{
    let t: <T as DimMax<U>>::Output = loop {};
}
"#,
        expect![[r#"
            182..183 't': T
            230..280 '{     ... {}; }': ()
            240..241 't': <T as DimMax<U>>::Output
            270..277 'loop {}': !
            275..277 '{}': ()
        "#]],
    )
}