use std::{
    path::Path,
    time::{Duration, Instant},
};

use fs::FakeFs;
use futures::StreamExt;
use gpui::TestAppContext;
use language::{CodeLabel, FakeLspAdapter, HighlightId, rust_lang};
use lsp::Uri;
use project::{
    Project,
    lsp_store::{log_store::TestRpcRequestTracker, *},
};
use serde_json::json;
use util::path;

use crate::init_test;

#[gpui::test]
async fn test_removing_invisible_worktree_cleans_reused_lsp_bookkeeping(cx: &mut TestAppContext) {
    init_test(cx);
    cx.executor().allow_parking();

    let fs = FakeFs::new(cx.executor());
    fs.insert_tree(path!("/the-root"), json!({ "main.rs": "fn main() {}" }))
        .await;
    fs.insert_tree(
        path!("/the-registry"),
        json!({ "dep": { "src": { "dep.rs": "pub fn dep() {}" } } }),
    )
    .await;

    let project = Project::test(fs, [path!("/the-root").as_ref()], cx).await;
    let language_registry = project.read_with(cx, |project, _| project.languages().clone());
    language_registry.add(rust_lang());
    let mut fake_servers = language_registry.register_fake_lsp("Rust", FakeLspAdapter::default());

    let (_visible_buffer, _visible_handle) = project
        .update(cx, |project, cx| {
            project.open_local_buffer_with_lsp(path!("/the-root/main.rs"), cx)
        })
        .await
        .unwrap();
    fake_servers.next().await.unwrap();
    cx.run_until_parked();

    let server_id = project.read_with(cx, |project, cx| {
        project
            .lsp_store()
            .read(cx)
            .language_server_statuses()
            .next()
            .unwrap()
            .0
    });
    let external_buffer = project
        .update(cx, |project, cx| {
            project.open_local_buffer_via_lsp(
                Uri::from_file_path(path!("/the-registry/dep/src/dep.rs")).unwrap(),
                server_id,
                cx,
            )
        })
        .await
        .unwrap();
    cx.run_until_parked();

    let invisible_worktree_id =
        external_buffer.read_with(cx, |buffer, cx| buffer.file().unwrap().worktree_id(cx));
    project.read_with(cx, |project, cx| {
        let worktree = project.worktree_for_id(invisible_worktree_id, cx).unwrap();
        assert!(!worktree.read(cx).is_visible());
        assert!(
            project
                .lsp_store()
                .read(cx)
                .has_language_server_seed_for_worktree(invisible_worktree_id)
        );
    });

    project.update(cx, |project, cx| {
        project.remove_worktree(invisible_worktree_id, cx);
    });
    cx.run_until_parked();

    project.read_with(cx, |project, cx| {
        let lsp_store = project.lsp_store();
        let lsp_store = lsp_store.read(cx);
        assert!(
            lsp_store
                .language_server_statuses()
                .any(|(status_server_id, _)| status_server_id == server_id)
        );
        assert!(!lsp_store.has_language_server_seed_for_worktree(invisible_worktree_id));
    });
}

#[test]
fn test_rpc_request_tracker_distinguishes_request_directions() {
    let mut tracker = TestRpcRequestTracker::new();
    let started_at = Instant::now();

    assert_eq!(
        tracker.observe(
            false,
            r#"{"jsonrpc":"2.0","id":1,"method":"textDocument/hover"}"#,
            started_at,
        ),
        None
    );
    assert_eq!(
        tracker.observe(
            true,
            r#"{"jsonrpc":"2.0","id":1,"method":"workspace/configuration"}"#,
            started_at + Duration::from_millis(10),
        ),
        None
    );
    assert_eq!(
        tracker.observe(
            false,
            r#"{"jsonrpc":"2.0","id":1,"result":[]}"#,
            started_at + Duration::from_millis(30),
        ),
        Some(Duration::from_millis(20))
    );
    assert_eq!(
        tracker.observe(
            true,
            r#"{"jsonrpc":"2.0","id":1,"result":null}"#,
            started_at + Duration::from_millis(50),
        ),
        Some(Duration::from_millis(50))
    );
}

#[test]
fn test_rpc_request_tracker_decodes_ids_and_times_cancelled_requests() {
    let mut tracker = TestRpcRequestTracker::new();
    let started_at = Instant::now();

    tracker.observe(
        true,
        r#"{"jsonrpc":"2.0","id":"foo\u002fbar","method":"workspace/configuration"}"#,
        started_at,
    );
    assert_eq!(
        tracker.observe(
            false,
            r#"{"jsonrpc":"2.0","id":"foo/bar","result":[]}"#,
            started_at + Duration::from_millis(25),
        ),
        Some(Duration::from_millis(25))
    );

    tracker.observe(
        false,
        r#"{"jsonrpc":"2.0","id":7,"method":"textDocument/hover"}"#,
        started_at,
    );
    tracker.observe(
        false,
        r#"{"jsonrpc":"2.0","method":"$/cancelRequest","params":{"id":7}}"#,
        started_at + Duration::from_millis(1),
    );
    assert_eq!(tracker.pending_request_count(), 1);
    assert_eq!(
        tracker.observe(
            true,
            r#"{"jsonrpc":"2.0","id":7,"error":{"code":-32800,"message":"Request was cancelled"}}"#,
            started_at + Duration::from_millis(10),
        ),
        Some(Duration::from_millis(10))
    );
    assert_eq!(tracker.pending_request_count(), 0);
}

#[test]
fn test_rpc_request_tracker_bounds_unanswered_requests() {
    let mut tracker = TestRpcRequestTracker::new();
    let started_at = Instant::now();
    let max_pending_requests = TestRpcRequestTracker::max_pending_requests();

    for id in 0..=max_pending_requests {
        tracker.observe(
            false,
            &format!(r#"{{"jsonrpc":"2.0","id":{id},"method":"textDocument/hover"}}"#),
            started_at + Duration::from_nanos(id as u64),
        );
    }

    assert_eq!(tracker.pending_request_count(), max_pending_requests);
    assert_eq!(
        tracker.observe(
            true,
            r#"{"jsonrpc":"2.0","id":0,"result":null}"#,
            started_at + Duration::from_secs(1),
        ),
        None
    );
    assert!(
        tracker
            .observe(
                true,
                r#"{"jsonrpc":"2.0","id":1,"result":null}"#,
                started_at + Duration::from_secs(1),
            )
            .is_some()
    );
}

#[test]
fn test_rpc_log_duration_proto_roundtrip() {
    let log_type = LanguageServerLogType::Rpc {
        received: true,
        elapsed: Some(Duration::from_micros(1234)),
    };

    assert_eq!(
        LanguageServerLogType::from_proto(log_type.to_proto()),
        log_type
    );
}

#[test]
fn test_glob_literal_prefix() {
    assert_eq!(glob_literal_prefix(Path::new("**/*.js")), Path::new(""));
    assert_eq!(
        glob_literal_prefix(Path::new("node_modules/**/*.js")),
        Path::new("node_modules")
    );
    assert_eq!(
        glob_literal_prefix(Path::new("foo/{bar,baz}.js")),
        Path::new("foo")
    );
    assert_eq!(
        glob_literal_prefix(Path::new("foo/bar/baz.js")),
        Path::new("foo/bar/baz.js")
    );

    #[cfg(target_os = "windows")]
    {
        assert_eq!(glob_literal_prefix(Path::new("**\\*.js")), Path::new(""));
        assert_eq!(
            glob_literal_prefix(Path::new("node_modules\\**/*.js")),
            Path::new("node_modules")
        );
        assert_eq!(
            glob_literal_prefix(Path::new("foo/{bar,baz}.js")),
            Path::new("foo")
        );
        assert_eq!(
            glob_literal_prefix(Path::new("foo\\bar\\baz.js")),
            Path::new("foo/bar/baz.js")
        );
    }
}

#[test]
fn test_multi_len_chars_normalization() {
    let mut label = CodeLabel::new(
        "myElˇ (parameter) myElˇ: {\n    foo: string;\n}".to_string(),
        0..6,
        vec![(0..6, HighlightId::new(1))],
    );
    ensure_uniform_list_compatible_label(&mut label);
    assert_eq!(
        label,
        CodeLabel::new(
            "myElˇ (parameter) myElˇ: { foo: string; }".to_string(),
            0..6,
            vec![(0..6, HighlightId::new(1))],
        )
    );
}

#[test]
fn test_trailing_newline_in_completion_documentation() {
    let doc =
        lsp::Documentation::String("Inappropriate argument value (of correct type).\n".to_string());
    let completion_doc: CompletionDocumentation = doc.into();
    assert!(
        matches!(completion_doc, CompletionDocumentation::SingleLine(s) if s == "Inappropriate argument value (of correct type).")
    );

    let doc = lsp::Documentation::String("  some value  \n".to_string());
    let completion_doc: CompletionDocumentation = doc.into();
    assert!(matches!(
        completion_doc,
        CompletionDocumentation::SingleLine(s) if s == "some value"
    ));
}