mod macros;
mod globs;
mod incremental;

use std::sync::Arc;

use ra_db::SourceDatabase;
use test_utils::covers;
use insta::assert_snapshot_matches;

use crate::{Crate, mock::{MockDatabase, CrateGraphFixture}, nameres::Resolution};

use super::*;

fn compute_crate_def_map(fixture: &str, graph: Option<CrateGraphFixture>) -> Arc<CrateDefMap> {
    let mut db = MockDatabase::with_files(fixture);
    if let Some(graph) = graph {
        db.set_crate_graph_from_fixture(graph);
    }
    let crate_id = db.crate_graph().iter().next().unwrap();
    let krate = Crate { crate_id };
    db.crate_def_map(krate)
}

fn render_crate_def_map(map: &CrateDefMap) -> String {
    let mut buf = String::new();
    go(&mut buf, map, "\ncrate", map.root);
    return buf;

    fn go(buf: &mut String, map: &CrateDefMap, path: &str, module: CrateModuleId) {
        *buf += path;
        *buf += "\n";
        for (name, res) in map.modules[module].scope.items.iter() {
            *buf += &format!("{}: {}\n", name, dump_resolution(res))
        }
        for (name, child) in map.modules[module].children.iter() {
            let path = path.to_string() + &format!("::{}", name);
            go(buf, map, &path, *child);
        }
    }

    fn dump_resolution(resolution: &Resolution) -> &'static str {
        match (resolution.def.types.is_some(), resolution.def.values.is_some()) {
            (true, true) => "t v",
            (true, false) => "t",
            (false, true) => "v",
            (false, false) => "_",
        }
    }
}

fn def_map(fixtute: &str) -> String {
    let dm = compute_crate_def_map(fixtute, None);
    render_crate_def_map(&dm)
}

fn def_map_with_crate_graph(fixtute: &str, graph: CrateGraphFixture) -> String {
    let dm = compute_crate_def_map(fixtute, Some(graph));
    render_crate_def_map(&dm)
}

#[test]
fn crate_def_map_smoke_test() {
    let map = def_map(
        "
        //- /lib.rs
        mod foo;
        struct S;
        use crate::foo::bar::E;
        use self::E::V;

        //- /foo/mod.rs
        pub mod bar;
        fn f() {}

        //- /foo/bar.rs
        pub struct Baz;
        enum E { V }
        ",
    );
    assert_snapshot_matches!(map, @r###"
crate
V: t v
E: t
foo: t
S: t v

crate::foo
bar: t
f: v

crate::foo::bar
Baz: t v
E: t
"###
    )
}

#[test]
fn bogus_paths() {
    covers!(bogus_paths);
    let map = def_map(
        "
        //- /lib.rs
        mod foo;
        struct S;
        use self;

        //- /foo/mod.rs
        use super;
        use crate;

        ",
    );
    assert_snapshot_matches!(map, @r###"
crate
foo: t
S: t v

crate::foo
"###
    )
}

#[test]
fn use_as() {
    let map = def_map(
        "
        //- /lib.rs
        mod foo;

        use crate::foo::Baz as Foo;

        //- /foo/mod.rs
        pub struct Baz;
        ",
    );
    assert_snapshot_matches!(map,
        @r###"
crate
Foo: t v
foo: t

crate::foo
Baz: t v
"###
    );
}

#[test]
fn use_trees() {
    let map = def_map(
        "
        //- /lib.rs
        mod foo;

        use crate::foo::bar::{Baz, Quux};

        //- /foo/mod.rs
        pub mod bar;

        //- /foo/bar.rs
        pub struct Baz;
        pub enum Quux {};
        ",
    );
    assert_snapshot_matches!(map,
        @r###"
crate
Quux: t
Baz: t v
foo: t

crate::foo
bar: t

crate::foo::bar
Quux: t
Baz: t v
"###
    );
}

#[test]
fn re_exports() {
    let map = def_map(
        "
        //- /lib.rs
        mod foo;

        use self::foo::Baz;

        //- /foo/mod.rs
        pub mod bar;

        pub use self::bar::Baz;

        //- /foo/bar.rs
        pub struct Baz;
        ",
    );
    assert_snapshot_matches!(map,
        @r###"
crate
Baz: t v
foo: t

crate::foo
bar: t
Baz: t v

crate::foo::bar
Baz: t v
"###
    );
}

#[test]
fn std_prelude() {
    covers!(std_prelude);
    let map = def_map_with_crate_graph(
        "
        //- /main.rs
        use Foo::*;

        //- /lib.rs
        mod prelude;
        #[prelude_import]
        use prelude::*;

        //- /prelude.rs
        pub enum Foo { Bar, Baz };
        ",
        crate_graph! {
            "main": ("/main.rs", ["test_crate"]),
            "test_crate": ("/lib.rs", []),
        },
    );
    assert_snapshot_matches!(map, @r###"
crate
Bar: t v
Baz: t v
"###);
}

#[test]
fn can_import_enum_variant() {
    covers!(can_import_enum_variant);
    let map = def_map(
        "
        //- /lib.rs
        enum E { V }
        use self::E::V;
        ",
    );
    assert_snapshot_matches!(map, @r###"
crate
V: t v
E: t
"###
    );
}

#[test]
fn edition_2015_imports() {
    let map = def_map_with_crate_graph(
        "
        //- /main.rs
        mod foo;
        mod bar;

        //- /bar.rs
        struct Bar;

        //- /foo.rs
        use bar::Bar;
        use other_crate::FromLib;

        //- /lib.rs
        struct FromLib;
        ",
        crate_graph! {
            "main": ("/main.rs", "2015", ["other_crate"]),
            "other_crate": ("/lib.rs", "2018", []),
        },
    );

    assert_snapshot_matches!(map,
        @r###"
crate
bar: t
foo: t

crate::bar
Bar: t v

crate::foo
FromLib: t v
Bar: t v
"###
    );
}

#[test]
fn module_resolution_works_for_non_standard_filenames() {
    let map = def_map_with_crate_graph(
        "
        //- /my_library.rs
        mod foo;
        use self::foo::Bar;

        //- /foo/mod.rs
        pub struct Bar;
        ",
        crate_graph! {
            "my_library": ("/my_library.rs", []),
        },
    );

    assert_snapshot_matches!(map,
        @r###"
crate
Bar: t v
foo: t

crate::foo
Bar: t v
"###
    );
}

#[test]
fn name_res_works_for_broken_modules() {
    covers!(name_res_works_for_broken_modules);
    let map = def_map(
        "
        //- /lib.rs
        mod foo // no `;`, no body

        use self::foo::Baz;

        //- /foo/mod.rs
        pub mod bar;

        pub use self::bar::Baz;

        //- /foo/bar.rs
        pub struct Baz;
        ",
    );
    assert_snapshot_matches!(map,
        @r###"
crate
Baz: _
"###
    );
}

#[test]
fn item_map_using_self() {
    let map = def_map(
        "
        //- /lib.rs
        mod foo;
        use crate::foo::bar::Baz::{self};
        //- /foo/mod.rs
        pub mod bar;
        //- /foo/bar.rs
        pub struct Baz;
        ",
    );
    assert_snapshot_matches!(map,
        @r###"
crate
Baz: t v
foo: t

crate::foo
bar: t

crate::foo::bar
Baz: t v
"###
    );
}

#[test]
fn item_map_across_crates() {
    let map = def_map_with_crate_graph(
        "
        //- /main.rs
        use test_crate::Baz;

        //- /lib.rs
        pub struct Baz;
        ",
        crate_graph! {
            "main": ("/main.rs", ["test_crate"]),
            "test_crate": ("/lib.rs", []),
        },
    );

    assert_snapshot_matches!(map,
        @r###"
crate
Baz: t v
"###
    );
}

#[test]
fn extern_crate_rename() {
    let map = def_map_with_crate_graph(
        "
        //- /main.rs
        extern crate alloc as alloc_crate;

        mod alloc;
        mod sync;

        //- /sync.rs
        use alloc_crate::Arc;

        //- /lib.rs
        struct Arc;
        ",
        crate_graph! {
            "main": ("/main.rs", ["alloc"]),
            "alloc": ("/lib.rs", []),
        },
    );

    assert_snapshot_matches!(map,
        @r###"
crate
Arc: t v
"###
    );
}

#[test]
fn extern_crate_rename_2015_edition() {
    let map = def_map_with_crate_graph(
        "
        //- /main.rs
        extern crate alloc as alloc_crate;

        mod alloc;
        mod sync;

        //- /sync.rs
        use alloc_crate::Arc;

        //- /lib.rs
        struct Arc;
        ",
        crate_graph! {
            "main": ("/main.rs", "2015", ["alloc"]),
            "alloc": ("/lib.rs", []),
        },
    );

    assert_snapshot_matches!(map,
        @r###"
crate
Arc: t v
"###
    );
}

#[test]
fn import_across_source_roots() {
    let map = def_map_with_crate_graph(
        "
        //- /lib.rs
        pub mod a {
            pub mod b {
                pub struct C;
            }
        }

        //- root /main/

        //- /main/main.rs
        use test_crate::a::b::C;
        ",
        crate_graph! {
            "main": ("/main/main.rs", ["test_crate"]),
            "test_crate": ("/lib.rs", []),
        },
    );

    assert_snapshot_matches!(map,
        @r###"
crate
C: t v
"###
    );
}

#[test]
fn reexport_across_crates() {
    let map = def_map_with_crate_graph(
        "
        //- /main.rs
        use test_crate::Baz;

        //- /lib.rs
        pub use foo::Baz;

        mod foo;

        //- /foo.rs
        pub struct Baz;
        ",
        crate_graph! {
            "main": ("/main.rs", ["test_crate"]),
            "test_crate": ("/lib.rs", []),
        },
    );

    assert_snapshot_matches!(map,
        @r###"
crate
Baz: t v
"###
    );
}

#[test]
fn values_dont_shadow_extern_crates() {
    let map = def_map_with_crate_graph(
        "
        //- /main.rs
        fn foo() {}
        use foo::Bar;

        //- /foo/lib.rs
        pub struct Bar;
        ",
        crate_graph! {
            "main": ("/main.rs", ["foo"]),
            "foo": ("/foo/lib.rs", []),
        },
    );

    assert_snapshot_matches!(map,
        @r###"
crate
Bar: t v
foo: v
"###
    );
}

#[test]
fn unresolved_module_diagnostics() {
    let diagnostics = MockDatabase::with_files(
        r"
        //- /lib.rs
        mod foo;
        mod bar;
        mod baz {}
        //- /foo.rs
        ",
    )
    .diagnostics();

    assert_snapshot_matches!(diagnostics, @r###"
"mod bar;": unresolved module
"###
    );
}