#![expect(clippy::result_large_err)]
use crate::{
    debugger_panel::DebugPanel,
    persistence::DebuggerPaneItem,
    tests::{active_debug_session_panel, init_test, init_test_workspace, start_debug_session},
};
use dap::{
    StoppedEvent,
    requests::{Initialize, Modules},
};
use gpui::{BackgroundExecutor, TestAppContext, VisualTestContext};
use project::{FakeFs, Project};
use std::sync::{
    Arc,
    atomic::{AtomicBool, AtomicI32, Ordering},
};
use util::path;

#[gpui::test]
async fn test_module_list(executor: BackgroundExecutor, cx: &mut TestAppContext) {
    init_test(cx);

    let fs = FakeFs::new(executor.clone());

    let project = Project::test(fs, [path!("/project").as_ref()], cx).await;
    let workspace = init_test_workspace(&project, cx).await;
    workspace
        .update(cx, |workspace, window, cx| {
            workspace.focus_panel::<DebugPanel>(window, cx);
        })
        .unwrap();
    let cx = &mut VisualTestContext::from_window(*workspace, cx);

    let session = start_debug_session(&workspace, cx, |client| {
        client.on_request::<Initialize, _>(move |_, _| {
            Ok(dap::Capabilities {
                supports_modules_request: Some(true),
                ..Default::default()
            })
        });
    })
    .unwrap();

    let client = session.update(cx, |session, _| session.adapter_client().unwrap());

    let called_modules = Arc::new(AtomicBool::new(false));
    let modules = vec![
        dap::Module {
            id: dap::ModuleId::Number(1),
            name: "First Module".into(),
            address_range: None,
            date_time_stamp: None,
            path: None,
            symbol_file_path: None,
            symbol_status: None,
            version: None,
            is_optimized: None,
            is_user_code: None,
        },
        dap::Module {
            id: dap::ModuleId::Number(2),
            name: "Second Module".into(),
            address_range: None,
            date_time_stamp: None,
            path: None,
            symbol_file_path: None,
            symbol_status: None,
            version: None,
            is_optimized: None,
            is_user_code: None,
        },
    ];

    client.on_request::<Modules, _>({
        let called_modules = called_modules.clone();
        let modules_request_count = AtomicI32::new(0);
        let modules = modules.clone();
        move |_, _| {
            modules_request_count.fetch_add(1, Ordering::SeqCst);
            assert_eq!(
                1,
                modules_request_count.load(Ordering::SeqCst),
                "This request should only be called once from the host"
            );
            called_modules.store(true, Ordering::SeqCst);

            Ok(dap::ModulesResponse {
                modules: modules.clone(),
                total_modules: Some(2u64),
            })
        }
    });

    client
        .fake_event(dap::messages::Events::Stopped(StoppedEvent {
            reason: dap::StoppedEventReason::Pause,
            description: None,
            thread_id: Some(1),
            preserve_focus_hint: None,
            text: None,
            all_threads_stopped: None,
            hit_breakpoint_ids: None,
        }))
        .await;

    cx.run_until_parked();

    let running_state =
        active_debug_session_panel(workspace, cx).update_in(cx, |item, window, cx| {
            cx.focus_self(window);
            item.running_state().clone()
        });

    running_state.update_in(cx, |this, window, cx| {
        this.activate_item(DebuggerPaneItem::Modules, window, cx);
        cx.refresh_windows();
    });

    cx.run_until_parked();

    assert!(
        called_modules.load(std::sync::atomic::Ordering::SeqCst),
        "Request Modules should be called because a user clicked on the module list"
    );

    active_debug_session_panel(workspace, cx).update(cx, |_, cx| {
        let actual_modules = running_state.update(cx, |state, cx| {
            state.module_list().update(cx, |list, cx| list.modules(cx))
        });

        assert_eq!(modules, actual_modules);
    });

    // Test all module events now
    // New Module
    // Changed
    // Removed

    let new_module = dap::Module {
        id: dap::ModuleId::Number(3),
        name: "Third Module".into(),
        address_range: None,
        date_time_stamp: None,
        path: None,
        symbol_file_path: None,
        symbol_status: None,
        version: None,
        is_optimized: None,
        is_user_code: None,
    };

    client
        .fake_event(dap::messages::Events::Module(dap::ModuleEvent {
            reason: dap::ModuleEventReason::New,
            module: new_module.clone(),
        }))
        .await;

    cx.run_until_parked();

    active_debug_session_panel(workspace, cx).update(cx, |_, cx| {
        let actual_modules = running_state.update(cx, |state, cx| {
            state.module_list().update(cx, |list, cx| list.modules(cx))
        });
        assert_eq!(actual_modules.len(), 3);
        assert!(actual_modules.contains(&new_module));
    });

    let changed_module = dap::Module {
        id: dap::ModuleId::Number(2),
        name: "Modified Second Module".into(),
        address_range: None,
        date_time_stamp: None,
        path: None,
        symbol_file_path: None,
        symbol_status: None,
        version: None,
        is_optimized: None,
        is_user_code: None,
    };

    client
        .fake_event(dap::messages::Events::Module(dap::ModuleEvent {
            reason: dap::ModuleEventReason::Changed,
            module: changed_module.clone(),
        }))
        .await;

    cx.run_until_parked();

    active_debug_session_panel(workspace, cx).update(cx, |_, cx| {
        let actual_modules = running_state.update(cx, |state, cx| {
            state.module_list().update(cx, |list, cx| list.modules(cx))
        });

        assert_eq!(actual_modules.len(), 3);
        assert!(actual_modules.contains(&changed_module));
    });

    client
        .fake_event(dap::messages::Events::Module(dap::ModuleEvent {
            reason: dap::ModuleEventReason::Removed,
            module: changed_module.clone(),
        }))
        .await;

    cx.run_until_parked();

    active_debug_session_panel(workspace, cx).update(cx, |_, cx| {
        let actual_modules = running_state.update(cx, |state, cx| {
            state.module_list().update(cx, |list, cx| list.modules(cx))
        });

        assert_eq!(actual_modules.len(), 2);
        assert!(!actual_modules.contains(&changed_module));
    });
}
