mod block;

use expect_test::{expect, Expect};
use test_fixture::WithFixture;

use crate::{test_db::TestDB, ModuleDefId};

use super::*;

fn lower(ra_fixture: &str) -> (TestDB, Arc<Body>, DefWithBodyId) {
    let db = TestDB::with_files(ra_fixture);

    let krate = db.fetch_test_crate();
    let def_map = db.crate_def_map(krate);
    let mut fn_def = None;
    'outer: for (_, module) in def_map.modules() {
        for decl in module.scope.declarations() {
            if let ModuleDefId::FunctionId(it) = decl {
                fn_def = Some(it);
                break 'outer;
            }
        }
    }
    let fn_def = fn_def.unwrap().into();

    let body = db.body(fn_def);
    (db, body, fn_def)
}

fn def_map_at(ra_fixture: &str) -> String {
    let (db, position) = TestDB::with_position(ra_fixture);

    let module = db.module_at_position(position);
    module.def_map(&db).dump(&db)
}

fn check_block_scopes_at(ra_fixture: &str, expect: Expect) {
    let (db, position) = TestDB::with_position(ra_fixture);

    let module = db.module_at_position(position);
    let actual = module.def_map(&db).dump_block_scopes(&db);
    expect.assert_eq(&actual);
}

fn check_at(ra_fixture: &str, expect: Expect) {
    let actual = def_map_at(ra_fixture);
    expect.assert_eq(&actual);
}

#[test]
fn your_stack_belongs_to_me() {
    cov_mark::check!(your_stack_belongs_to_me);
    lower(
        r#"
#![recursion_limit = "32"]
macro_rules! n_nuple {
    ($e:tt) => ();
    ($($rest:tt)*) => {{
        (n_nuple!($($rest)*)None,)
    }};
}
fn main() { n_nuple!(1,2,3); }
"#,
    );
}

#[test]
fn your_stack_belongs_to_me2() {
    cov_mark::check!(overflow_but_not_me);
    lower(
        r#"
#![recursion_limit = "32"]
macro_rules! foo {
    () => {{ foo!(); foo!(); }}
}
fn main() { foo!(); }
"#,
    );
}

#[test]
fn recursion_limit() {
    lower(
        r#"
#![recursion_limit = "2"]
macro_rules! n_nuple {
    ($e:tt) => ();
    ($first:tt $($rest:tt)*) => {{
        n_nuple!($($rest)*)
    }};
}
fn main() { n_nuple!(1,2,3); }
"#,
    );
}

#[test]
fn issue_3642_bad_macro_stackover() {
    lower(
        r#"
#[macro_export]
macro_rules! match_ast {
    (match $node:ident { $($tt:tt)* }) => { match_ast!(match ($node) { $($tt)* }) };

    (match ($node:expr) {
        $( ast::$ast:ident($it:ident) => $res:expr, )*
        _ => $catch_all:expr $(,)?
    }) => {{
        $( if let Some($it) = ast::$ast::cast($node.clone()) { $res } else )*
        { $catch_all }
    }};
}

fn main() {
    let anchor = match_ast! {
        match parent {
            as => {},
            _ => return None
        }
    };
}"#,
    );
}

#[test]
fn macro_resolve() {
    // Regression test for a path resolution bug introduced with inner item handling.
    lower(
        r#"
macro_rules! vec {
    () => { () };
    ($elem:expr; $n:expr) => { () };
    ($($x:expr),+ $(,)?) => { () };
}
mod m {
    fn outer() {
        let _ = vec![FileSet::default(); self.len()];
    }
}
"#,
    );
}

#[test]
fn desugar_for_loop() {
    let (db, body, def) = lower(
        r#"
//- minicore: iterator
fn main() {
    for ident in 0..10 {
        foo();
        bar()
    }
}
"#,
    );

    expect![[r#"
        fn main() -> () {
            match builtin#lang(into_iter)(
                (0) ..(10) ,
            ) {
                mut <ra@gennew>11 => loop {
                    match builtin#lang(next)(
                        &mut <ra@gennew>11,
                    ) {
                        builtin#lang(None) => break,
                        builtin#lang(Some)(ident) => {
                            foo();
                            bar()
                        },
                    }
                },
            }
        }"#]]
    .assert_eq(&body.pretty_print(&db, def, Edition::CURRENT))
}

#[test]
fn desugar_builtin_format_args() {
    let (db, body, def) = lower(
        r#"
//- minicore: fmt
fn main() {
    let are = "are";
    let count = 10;
    builtin#format_args("\u{1b}hello {count:02} {} friends, we {are:?} {0}{last}", "fancy", last = "!");
}
"#,
    );

    expect![[r#"
        fn main() -> () {
            let are = "are";
            let count = 10;
            builtin#lang(Arguments::new_v1_formatted)(
                &[
                    "\u{1b}hello ", " ", " friends, we ", " ", "",
                ],
                &[
                    builtin#lang(Argument::new_display)(
                        &count,
                    ), builtin#lang(Argument::new_display)(
                        &"fancy",
                    ), builtin#lang(Argument::new_debug)(
                        &are,
                    ), builtin#lang(Argument::new_display)(
                        &"!",
                    ),
                ],
                &[
                    builtin#lang(Placeholder::new)(
                        0usize,
                        ' ',
                        builtin#lang(Alignment::Unknown),
                        8u32,
                        builtin#lang(Count::Implied),
                        builtin#lang(Count::Is)(
                            2usize,
                        ),
                    ), builtin#lang(Placeholder::new)(
                        1usize,
                        ' ',
                        builtin#lang(Alignment::Unknown),
                        0u32,
                        builtin#lang(Count::Implied),
                        builtin#lang(Count::Implied),
                    ), builtin#lang(Placeholder::new)(
                        2usize,
                        ' ',
                        builtin#lang(Alignment::Unknown),
                        0u32,
                        builtin#lang(Count::Implied),
                        builtin#lang(Count::Implied),
                    ), builtin#lang(Placeholder::new)(
                        1usize,
                        ' ',
                        builtin#lang(Alignment::Unknown),
                        0u32,
                        builtin#lang(Count::Implied),
                        builtin#lang(Count::Implied),
                    ), builtin#lang(Placeholder::new)(
                        3usize,
                        ' ',
                        builtin#lang(Alignment::Unknown),
                        0u32,
                        builtin#lang(Count::Implied),
                        builtin#lang(Count::Implied),
                    ),
                ],
                unsafe {
                    builtin#lang(UnsafeArg::new)()
                },
            );
        }"#]]
    .assert_eq(&body.pretty_print(&db, def, Edition::CURRENT))
}

#[test]
fn test_macro_hygiene() {
    let (db, body, def) = lower(
        r##"
//- minicore: fmt, from
//- /main.rs
mod error;

use crate::error::error;

fn main() {
    // _ = forces body expansion instead of block def map expansion
    _ = error!("Failed to resolve path `{}`", node.text());
}
//- /error.rs
macro_rules! _error {
    ($fmt:expr, $($arg:tt)+) => {$crate::error::intermediate!(format_args!($fmt, $($arg)+))}
}
pub(crate) use _error as error;
macro_rules! _intermediate {
    ($arg:expr) => {$crate::error::SsrError::new($arg)}
}
pub(crate) use _intermediate as intermediate;

pub struct SsrError(pub(crate) core::fmt::Arguments);

impl SsrError {
    pub(crate) fn new(message: impl Into<core::fmt::Arguments>) -> SsrError {
        SsrError(message.into())
    }
}
"##,
    );

    assert_eq!(db.body_with_source_map(def).1.diagnostics(), &[]);
    expect![[r#"
        fn main() -> () {
            _ = $crate::error::SsrError::new(
                builtin#lang(Arguments::new_v1_formatted)(
                    &[
                        "Failed to resolve path `", "`",
                    ],
                    &[
                        builtin#lang(Argument::new_display)(
                            &node.text(),
                        ),
                    ],
                    &[
                        builtin#lang(Placeholder::new)(
                            0usize,
                            ' ',
                            builtin#lang(Alignment::Unknown),
                            0u32,
                            builtin#lang(Count::Implied),
                            builtin#lang(Count::Implied),
                        ),
                    ],
                    unsafe {
                        builtin#lang(UnsafeArg::new)()
                    },
                ),
            );
        }"#]]
    .assert_eq(&body.pretty_print(&db, def, Edition::CURRENT))
}

#[test]
fn regression_10300() {
    let (db, body, def) = lower(
        r#"
//- minicore: concat, panic
mod private {
    pub use core::concat;
}

macro_rules! m {
    () => {
        panic!(concat!($crate::private::concat!("cc")));
    };
}

fn f(a: i32, b: u32) -> String {
    m!();
}
"#,
    );

    let (_, source_map) = db.body_with_source_map(def);
    assert_eq!(source_map.diagnostics(), &[]);

    for (_, def_map) in body.blocks(&db) {
        assert_eq!(def_map.diagnostics(), &[]);
    }

    expect![[r#"
        fn f(a: i32, b: u32) -> String {
            {
                $crate::panicking::panic_fmt(
                    builtin#lang(Arguments::new_v1_formatted)(
                        &[
                            "cc",
                        ],
                        &[],
                        &[],
                        unsafe {
                            builtin#lang(UnsafeArg::new)()
                        },
                    ),
                );
            };
        }"#]]
    .assert_eq(&body.pretty_print(&db, def, Edition::CURRENT))
}

#[test]
fn destructuring_assignment_tuple_macro() {
    // This is a funny one. `let m!()() = Bar()` is an error in rustc, because `m!()()` isn't a valid pattern,
    // but in destructuring assignment it is valid, because `m!()()` is a valid expression, and destructuring
    // assignments start their lives as expressions. So we have to do the same.

    let (db, body, def) = lower(
        r#"
struct Bar();

macro_rules! m {
    () => { Bar };
}

fn foo() {
    m!()() = Bar();
}
"#,
    );

    let (_, source_map) = db.body_with_source_map(def);
    assert_eq!(source_map.diagnostics(), &[]);

    for (_, def_map) in body.blocks(&db) {
        assert_eq!(def_map.diagnostics(), &[]);
    }

    expect![[r#"
        fn foo() -> () {
            Bar() = Bar();
        }"#]]
    .assert_eq(&body.pretty_print(&db, def, Edition::CURRENT))
}

#[test]
fn shadowing_record_variant() {
    let (_, body, _) = lower(
        r#"
enum A {
    B { field: i32 },
}
fn f() {
    use A::*;
    match () {
        B => {}
    };
}
    "#,
    );
    assert_eq!(body.bindings.len(), 1, "should have a binding for `B`");
    assert_eq!(
        body.bindings[BindingId::from_raw(RawIdx::from_u32(0))].name.as_str(),
        "B",
        "should have a binding for `B`",
    );
}

#[test]
fn regression_pretty_print_bind_pat() {
    let (db, body, owner) = lower(
        r#"
fn foo() {
    let v @ u = 123;
}
"#,
    );
    let printed = body.pretty_print(&db, owner, Edition::CURRENT);
    assert_eq!(
        printed,
        r#"fn foo() -> () {
    let v @ u = 123;
}"#
    );
}
