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use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext};

// Diagnostic: missing-lifetime
//
// This diagnostic is triggered when a lifetime argument is missing.
pub(crate) fn missing_lifetime(
    ctx: &DiagnosticsContext<'_>,
    d: &hir::MissingLifetime,
) -> Diagnostic {
    Diagnostic::new_with_syntax_node_ptr(
        ctx,
        DiagnosticCode::RustcHardError("E0106"),
        "missing lifetime specifier",
        d.generics_or_segment.map(Into::into),
    )
}

#[cfg(test)]
mod tests {
    use crate::tests::check_diagnostics;

    #[test]
    fn in_fields() {
        check_diagnostics(
            r#"
struct Foo<'a>(&'a ());
struct Bar(Foo);
        // ^^^ error: missing lifetime specifier
        "#,
        );
    }

    #[test]
    fn bounds() {
        check_diagnostics(
            r#"
struct Foo<'a, T>(&'a T);
trait Trait<'a> {
    type Assoc;
}

fn foo<'a, T: Trait>(
           // ^^^^^ error: missing lifetime specifier
    _: impl Trait<'a, Assoc: Trait>,
                          // ^^^^^ error: missing lifetime specifier
)
where
    Foo<T>: Trait<'a>,
    // ^^^ error: missing lifetime specifier
{
}
        "#,
        );
    }

    #[test]
    fn generic_defaults() {
        check_diagnostics(
            r#"
struct Foo<'a>(&'a ());

struct Bar<T = Foo>(T);
            // ^^^ error: missing lifetime specifier
        "#,
        );
    }

    #[test]
    fn type_alias_type() {
        check_diagnostics(
            r#"
struct Foo<'a>(&'a ());

type Bar = Foo;
        // ^^^ error: missing lifetime specifier
        "#,
        );
    }

    #[test]
    fn const_param_ty() {
        check_diagnostics(
            r#"
struct Foo<'a>(&'a ());

fn bar<const F: Foo>() {}
             // ^^^ error: missing lifetime specifier
        "#,
        );
    }

    #[test]
    fn fn_traits() {
        check_diagnostics(
            r#"
//- minicore: fn
struct WithLifetime<'a>(&'a ());

fn foo<T: Fn(WithLifetime) -> WithLifetime>() {}
        "#,
        );
    }

    #[test]
    fn regression_21430() {
        check_diagnostics(
            r#"
struct S {
    f: fn(A<()>),
}

struct A<'a, T> {
    a: &'a T,
}
        "#,
        );
    }

    // FIXME: Ideally, should emit generic default forbidden as well
    #[test]
    fn regression_16280() {
        check_diagnostics(
            r#"
trait Traitor<'a, const M: Traitor = Traitor> {
    fn crash<const Traitor: Traitor = Traitor, const M: Traitor = Traitor>(&self) -> Traitor {
                         // ^^^^^^^ error: missing lifetime specifier
                                                     // ^^^^^^^ error: missing lifetime specifier
        Traitor
    }
}
"#,
        );
    }
}