use std::{
    env,
    path::{Path, PathBuf},
    rc::Rc,
    sync::Arc,
};
#[cfg(any(feature = "wayland", feature = "x11"))]
use std::{
    ffi::OsString,
    fs::File,
    io::Read as _,
    os::fd::{AsFd, FromRawFd, IntoRawFd},
    time::Duration,
};

use anyhow::{Context as _, anyhow};
use calloop::LoopSignal;
use futures::channel::oneshot;
use util::ResultExt as _;
use util::command::{new_command, new_std_command};
#[cfg(any(feature = "wayland", feature = "x11"))]
use xkbcommon::xkb::{self, Keycode, Keysym, State};

use crate::linux::{LinuxDispatcher, PriorityQueueCalloopReceiver};
use gpui::{
    Action, AnyWindowHandle, BackgroundExecutor, ClipboardItem, CursorStyle, DisplayId,
    ForegroundExecutor, Keymap, Menu, MenuItem, OwnedMenu, PathPromptOptions, Platform,
    PlatformDisplay, PlatformKeyboardLayout, PlatformKeyboardMapper, PlatformTextSystem,
    PlatformWindow, Result, RunnableVariant, Task, ThermalState, WindowAppearance,
    WindowButtonLayout, WindowParams,
};
#[cfg(any(feature = "wayland", feature = "x11"))]
use gpui::{Pixels, Point, px};

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(crate) const SCROLL_LINES: f32 = 3.0;

// Values match the defaults on GTK.
// Taken from https://github.com/GNOME/gtk/blob/main/gtk/gtksettings.c#L320
#[cfg(any(feature = "wayland", feature = "x11"))]
pub(crate) const DOUBLE_CLICK_INTERVAL: Duration = Duration::from_millis(400);
#[cfg(any(feature = "wayland", feature = "x11"))]
pub(crate) const DOUBLE_CLICK_DISTANCE: Pixels = px(5.0);
pub(crate) const KEYRING_LABEL: &str = "zed-github-account";

#[cfg(any(feature = "wayland", feature = "x11"))]
const FILE_PICKER_PORTAL_MISSING: &str =
    "Couldn't open file picker due to missing xdg-desktop-portal implementation.";

pub(crate) trait LinuxClient {
    fn compositor_name(&self) -> &'static str;
    fn with_common<R>(&self, f: impl FnOnce(&mut LinuxCommon) -> R) -> R;
    fn keyboard_layout(&self) -> Box<dyn PlatformKeyboardLayout>;
    fn displays(&self) -> Vec<Rc<dyn PlatformDisplay>>;
    #[allow(unused)]
    fn display(&self, id: DisplayId) -> Option<Rc<dyn PlatformDisplay>>;
    fn primary_display(&self) -> Option<Rc<dyn PlatformDisplay>>;

    #[cfg(feature = "screen-capture")]
    fn is_screen_capture_supported(&self) -> bool {
        true
    }

    #[cfg(feature = "screen-capture")]
    fn screen_capture_sources(
        &self,
    ) -> oneshot::Receiver<Result<Vec<Rc<dyn gpui::ScreenCaptureSource>>>> {
        let (sources_tx, sources_rx) = oneshot::channel();
        sources_tx
            .send(Err(anyhow::anyhow!(
                "gpui_linux was compiled without the screen-capture feature"
            )))
            .ok();
        sources_rx
    }

    fn open_window(
        &self,
        handle: AnyWindowHandle,
        options: WindowParams,
    ) -> anyhow::Result<Box<dyn PlatformWindow>>;
    fn set_cursor_style(&self, style: CursorStyle);
    fn hide_cursor_until_mouse_moves(&self) {}
    fn is_cursor_visible(&self) -> bool {
        true
    }
    fn open_uri(&self, uri: &str);
    fn reveal_path(&self, path: PathBuf);
    fn write_to_primary(&self, item: ClipboardItem);
    fn write_to_clipboard(&self, item: ClipboardItem);
    fn read_from_primary(&self) -> Option<ClipboardItem>;
    fn read_from_clipboard(&self) -> Option<ClipboardItem>;
    fn active_window(&self) -> Option<AnyWindowHandle>;
    fn window_stack(&self) -> Option<Vec<AnyWindowHandle>>;
    fn run(&self);

    #[cfg(any(feature = "wayland", feature = "x11"))]
    fn window_identifier(
        &self,
    ) -> impl Future<Output = Option<ashpd::WindowIdentifier>> + Send + 'static {
        std::future::ready::<Option<ashpd::WindowIdentifier>>(None)
    }
}

#[derive(Default)]
pub(crate) struct PlatformHandlers {
    pub(crate) open_urls: Option<Box<dyn FnMut(Vec<String>)>>,
    pub(crate) quit: Option<Box<dyn FnMut()>>,
    pub(crate) reopen: Option<Box<dyn FnMut()>>,
    pub(crate) app_menu_action: Option<Box<dyn FnMut(&dyn Action)>>,
    pub(crate) will_open_app_menu: Option<Box<dyn FnMut()>>,
    pub(crate) validate_app_menu_command: Option<Box<dyn FnMut(&dyn Action) -> bool>>,
    pub(crate) keyboard_layout_change: Option<Box<dyn FnMut()>>,
}

pub(crate) struct LinuxCommon {
    pub(crate) background_executor: BackgroundExecutor,
    pub(crate) foreground_executor: ForegroundExecutor,
    pub(crate) text_system: Arc<dyn PlatformTextSystem>,
    pub(crate) appearance: WindowAppearance,
    pub(crate) auto_hide_scrollbars: bool,
    pub(crate) button_layout: WindowButtonLayout,
    pub(crate) callbacks: PlatformHandlers,
    pub(crate) signal: LoopSignal,
    pub(crate) menus: Vec<OwnedMenu>,
}

impl LinuxCommon {
    pub fn new(signal: LoopSignal) -> (Self, PriorityQueueCalloopReceiver<RunnableVariant>) {
        let (main_sender, main_receiver) = PriorityQueueCalloopReceiver::new();

        #[cfg(any(feature = "wayland", feature = "x11"))]
        let text_system = Arc::new(crate::linux::CosmicTextSystem::new("IBM Plex Sans"));
        #[cfg(not(any(feature = "wayland", feature = "x11")))]
        let text_system = Arc::new(gpui::NoopTextSystem::new());

        let callbacks = PlatformHandlers::default();

        let dispatcher = Arc::new(LinuxDispatcher::new(main_sender));

        let background_executor = BackgroundExecutor::new(dispatcher.clone());

        let common = LinuxCommon {
            background_executor,
            foreground_executor: ForegroundExecutor::new(dispatcher),
            text_system,
            appearance: WindowAppearance::Light,
            auto_hide_scrollbars: false,
            button_layout: WindowButtonLayout::linux_default(),
            callbacks,
            signal,
            menus: Vec::new(),
        };

        (common, main_receiver)
    }
}

pub(crate) struct LinuxPlatform<P> {
    pub(crate) inner: P,
}

impl<P: LinuxClient + 'static> Platform for LinuxPlatform<P> {
    fn background_executor(&self) -> BackgroundExecutor {
        self.inner
            .with_common(|common| common.background_executor.clone())
    }

    fn foreground_executor(&self) -> ForegroundExecutor {
        self.inner
            .with_common(|common| common.foreground_executor.clone())
    }

    fn text_system(&self) -> Arc<dyn PlatformTextSystem> {
        self.inner.with_common(|common| common.text_system.clone())
    }

    fn keyboard_layout(&self) -> Box<dyn PlatformKeyboardLayout> {
        self.inner.keyboard_layout()
    }

    fn keyboard_mapper(&self) -> Rc<dyn PlatformKeyboardMapper> {
        Rc::new(gpui::DummyKeyboardMapper)
    }

    fn on_keyboard_layout_change(&self, callback: Box<dyn FnMut()>) {
        self.inner
            .with_common(|common| common.callbacks.keyboard_layout_change = Some(callback));
    }

    fn on_thermal_state_change(&self, _callback: Box<dyn FnMut()>) {}

    fn thermal_state(&self) -> ThermalState {
        ThermalState::Nominal
    }

    fn run(&self, on_finish_launching: Box<dyn FnOnce()>) {
        on_finish_launching();

        LinuxClient::run(&self.inner);

        let quit = self
            .inner
            .with_common(|common| common.callbacks.quit.take());
        if let Some(mut fun) = quit {
            fun();
        }
    }

    fn quit(&self) {
        self.inner.with_common(|common| common.signal.stop());
    }

    fn compositor_name(&self) -> &'static str {
        self.inner.compositor_name()
    }

    fn restart(&self, binary_path: Option<PathBuf>) {
        use std::os::unix::process::CommandExt as _;

        // get the process id of the current process
        let app_pid = std::process::id().to_string();
        // get the path to the executable
        let app_path = if let Some(path) = binary_path {
            path
        } else {
            match self.app_path() {
                Ok(path) => path,
                Err(err) => {
                    log::error!("Failed to get app path: {:?}", err);
                    return;
                }
            }
        };

        log::info!("Restarting process, using app path: {:?}", app_path);

        // Script to wait for the current process to exit and then restart the app.
        // Pass dynamic values as positional parameters to avoid shell interpolation issues.
        let script = r#"
            while kill -0 "$0" 2>/dev/null; do
                sleep 0.1
            done

            "$1"
            "#;

        #[allow(
            clippy::disallowed_methods,
            reason = "We are restarting ourselves, using std command thus is fine"
        )]
        let restart_process = new_std_command("/usr/bin/env")
            .arg("bash")
            .arg("-c")
            .arg(script)
            .arg(&app_pid)
            .arg(&app_path)
            .process_group(0)
            .spawn();

        match restart_process {
            Ok(_) => self.quit(),
            Err(e) => log::error!("failed to spawn restart script: {:?}", e),
        }
    }

    fn activate(&self, _ignoring_other_apps: bool) {
        log::info!("activate is not implemented on Linux, ignoring the call")
    }

    fn hide(&self) {
        log::info!("hide is not implemented on Linux, ignoring the call")
    }

    fn hide_other_apps(&self) {
        log::info!("hide_other_apps is not implemented on Linux, ignoring the call")
    }

    fn unhide_other_apps(&self) {
        log::info!("unhide_other_apps is not implemented on Linux, ignoring the call")
    }

    fn primary_display(&self) -> Option<Rc<dyn PlatformDisplay>> {
        self.inner.primary_display()
    }

    fn displays(&self) -> Vec<Rc<dyn PlatformDisplay>> {
        self.inner.displays()
    }

    #[cfg(feature = "screen-capture")]
    fn is_screen_capture_supported(&self) -> bool {
        self.inner.is_screen_capture_supported()
    }

    #[cfg(feature = "screen-capture")]
    fn screen_capture_sources(
        &self,
    ) -> oneshot::Receiver<Result<Vec<Rc<dyn gpui::ScreenCaptureSource>>>> {
        self.inner.screen_capture_sources()
    }

    fn active_window(&self) -> Option<AnyWindowHandle> {
        self.inner.active_window()
    }

    fn window_stack(&self) -> Option<Vec<AnyWindowHandle>> {
        self.inner.window_stack()
    }

    fn open_window(
        &self,
        handle: AnyWindowHandle,
        options: WindowParams,
    ) -> anyhow::Result<Box<dyn PlatformWindow>> {
        self.inner.open_window(handle, options)
    }

    fn open_url(&self, url: &str) {
        self.inner.open_uri(url);
    }

    fn on_open_urls(&self, callback: Box<dyn FnMut(Vec<String>)>) {
        self.inner
            .with_common(|common| common.callbacks.open_urls = Some(callback));
    }

    fn prompt_for_paths(
        &self,
        options: PathPromptOptions,
    ) -> oneshot::Receiver<Result<Option<Vec<PathBuf>>>> {
        let (done_tx, done_rx) = oneshot::channel();

        #[cfg(not(any(feature = "wayland", feature = "x11")))]
        let _ = (done_tx.send(Ok(None)), options);

        #[cfg(any(feature = "wayland", feature = "x11"))]
        let identifier = self.inner.window_identifier();

        #[cfg(any(feature = "wayland", feature = "x11"))]
        self.foreground_executor()
            .spawn(async move {
                let title = if options.directories {
                    "Open Folder"
                } else {
                    "Open File"
                };

                let request = match ashpd::desktop::file_chooser::OpenFileRequest::default()
                    .identifier(identifier.await)
                    .modal(true)
                    .title(title)
                    .accept_label(options.prompt.as_ref().map(gpui::SharedString::as_str))
                    .multiple(options.multiple)
                    .directory(options.directories)
                    .send()
                    .await
                {
                    Ok(request) => request,
                    Err(err) => {
                        let result = match err {
                            ashpd::Error::PortalNotFound(_) => anyhow!(FILE_PICKER_PORTAL_MISSING),
                            err => err.into(),
                        };
                        let _ = done_tx.send(Err(result));
                        return;
                    }
                };

                let result = match request.response() {
                    Ok(response) => Ok(Some(
                        response
                            .uris()
                            .iter()
                            .filter_map(|uri: &ashpd::Uri| url::Url::parse(uri.as_str()).ok())
                            .filter_map(|uri: url::Url| uri.to_file_path().ok())
                            .collect::<Vec<_>>(),
                    )),
                    Err(ashpd::Error::Response(_)) => Ok(None),
                    Err(e) => Err(e.into()),
                };
                let _ = done_tx.send(result);
            })
            .detach();
        done_rx
    }

    fn prompt_for_new_path(
        &self,
        directory: &Path,
        suggested_name: Option<&str>,
    ) -> oneshot::Receiver<Result<Option<PathBuf>>> {
        let (done_tx, done_rx) = oneshot::channel();

        #[cfg(not(any(feature = "wayland", feature = "x11")))]
        let _ = (done_tx.send(Ok(None)), directory, suggested_name);

        #[cfg(any(feature = "wayland", feature = "x11"))]
        let identifier = self.inner.window_identifier();

        #[cfg(any(feature = "wayland", feature = "x11"))]
        self.foreground_executor()
            .spawn({
                let directory = directory.to_owned();
                let suggested_name = suggested_name.map(|s| s.to_owned());

                async move {
                    let mut request_builder =
                        ashpd::desktop::file_chooser::SaveFileRequest::default()
                            .identifier(identifier.await)
                            .modal(true)
                            .title("Save File")
                            .current_folder(directory)
                            .expect("pathbuf should not be nul terminated");

                    if let Some(suggested_name) = suggested_name {
                        request_builder = request_builder.current_name(suggested_name.as_str());
                    }

                    let request = match request_builder.send().await {
                        Ok(request) => request,
                        Err(err) => {
                            let result = match err {
                                ashpd::Error::PortalNotFound(_) => {
                                    anyhow!(FILE_PICKER_PORTAL_MISSING)
                                }
                                err => err.into(),
                            };
                            let _ = done_tx.send(Err(result));
                            return;
                        }
                    };

                    let result = match request.response() {
                        Ok(response) => Ok(response
                            .uris()
                            .first()
                            .and_then(|uri: &ashpd::Uri| url::Url::parse(uri.as_str()).ok())
                            .and_then(|uri: url::Url| uri.to_file_path().ok())),
                        Err(ashpd::Error::Response(_)) => Ok(None),
                        Err(e) => Err(e.into()),
                    };
                    let _ = done_tx.send(result);
                }
            })
            .detach();

        done_rx
    }

    fn can_select_mixed_files_and_dirs(&self) -> bool {
        // org.freedesktop.portal.FileChooser only supports "pick files" and "pick directories".
        false
    }

    fn reveal_path(&self, path: &Path) {
        self.inner.reveal_path(path.to_owned());
    }

    fn open_with_system(&self, path: &Path) {
        let path = path.to_owned();
        self.background_executor()
            .spawn(async move {
                let _ = new_command("xdg-open")
                    .arg(path)
                    .spawn()
                    .context("invoking xdg-open")
                    .log_err()?
                    .status()
                    .await
                    .log_err()?;
                Some(())
            })
            .detach();
    }

    fn on_quit(&self, callback: Box<dyn FnMut()>) {
        self.inner.with_common(|common| {
            common.callbacks.quit = Some(callback);
        });
    }

    fn on_reopen(&self, callback: Box<dyn FnMut()>) {
        self.inner.with_common(|common| {
            common.callbacks.reopen = Some(callback);
        });
    }

    fn on_app_menu_action(&self, callback: Box<dyn FnMut(&dyn Action)>) {
        self.inner.with_common(|common| {
            common.callbacks.app_menu_action = Some(callback);
        });
    }

    fn on_will_open_app_menu(&self, callback: Box<dyn FnMut()>) {
        self.inner.with_common(|common| {
            common.callbacks.will_open_app_menu = Some(callback);
        });
    }

    fn on_validate_app_menu_command(&self, callback: Box<dyn FnMut(&dyn Action) -> bool>) {
        self.inner.with_common(|common| {
            common.callbacks.validate_app_menu_command = Some(callback);
        });
    }

    fn app_path(&self) -> Result<PathBuf> {
        // get the path of the executable of the current process
        let app_path = env::current_exe()?;
        Ok(app_path)
    }

    fn set_menus(&self, menus: Vec<Menu>, _keymap: &Keymap) {
        self.inner.with_common(|common| {
            common.menus = menus.into_iter().map(|menu| menu.owned()).collect();
        })
    }

    fn get_menus(&self) -> Option<Vec<OwnedMenu>> {
        self.inner.with_common(|common| Some(common.menus.clone()))
    }

    fn set_dock_menu(&self, _menu: Vec<MenuItem>, _keymap: &Keymap) {
        // todo(linux)
    }

    fn path_for_auxiliary_executable(&self, _name: &str) -> Result<PathBuf> {
        Err(anyhow::Error::msg(
            "Platform<LinuxPlatform>::path_for_auxiliary_executable is not implemented yet",
        ))
    }

    fn set_cursor_style(&self, style: CursorStyle) {
        self.inner.set_cursor_style(style)
    }

    fn hide_cursor_until_mouse_moves(&self) {
        self.inner.hide_cursor_until_mouse_moves()
    }

    fn is_cursor_visible(&self) -> bool {
        self.inner.is_cursor_visible()
    }

    fn should_auto_hide_scrollbars(&self) -> bool {
        self.inner.with_common(|common| common.auto_hide_scrollbars)
    }

    fn write_credentials(&self, url: &str, username: &str, password: &[u8]) -> Task<Result<()>> {
        let url = url.to_string();
        let username = username.to_string();
        let password = password.to_vec();
        self.background_executor().spawn(async move {
            let keyring = oo7::Keyring::new().await?;
            keyring.unlock().await?;
            keyring
                .create_item(
                    KEYRING_LABEL,
                    &vec![("url", &url), ("username", &username)],
                    password,
                    true,
                )
                .await?;
            Ok(())
        })
    }

    fn read_credentials(&self, url: &str) -> Task<Result<Option<(String, Vec<u8>)>>> {
        let url = url.to_string();
        self.background_executor().spawn(async move {
            let keyring = oo7::Keyring::new().await?;
            keyring.unlock().await?;

            let items = keyring.search_items(&vec![("url", &url)]).await?;

            for item in items.into_iter() {
                if item.label().await.is_ok_and(|label| label == KEYRING_LABEL) {
                    let attributes = item.attributes().await?;
                    let username = attributes
                        .get("username")
                        .context("Cannot find username in stored credentials")?;
                    item.unlock().await?;
                    let secret = item.secret().await?;

                    // we lose the zeroizing capabilities at this boundary,
                    // a current limitation GPUI's credentials api
                    return Ok(Some((username.to_string(), secret.to_vec())));
                } else {
                    continue;
                }
            }
            Ok(None)
        })
    }

    fn delete_credentials(&self, url: &str) -> Task<Result<()>> {
        let url = url.to_string();
        self.background_executor().spawn(async move {
            let keyring = oo7::Keyring::new().await?;
            keyring.unlock().await?;

            let items = keyring.search_items(&vec![("url", &url)]).await?;

            for item in items.into_iter() {
                if item.label().await.is_ok_and(|label| label == KEYRING_LABEL) {
                    item.delete().await?;
                    return Ok(());
                }
            }

            Ok(())
        })
    }

    fn window_appearance(&self) -> WindowAppearance {
        self.inner.with_common(|common| common.appearance)
    }

    fn button_layout(&self) -> Option<WindowButtonLayout> {
        Some(self.inner.with_common(|common| common.button_layout))
    }

    fn register_url_scheme(&self, _: &str) -> Task<anyhow::Result<()>> {
        Task::ready(Err(anyhow!("register_url_scheme unimplemented")))
    }

    fn write_to_primary(&self, item: ClipboardItem) {
        self.inner.write_to_primary(item)
    }

    fn write_to_clipboard(&self, item: ClipboardItem) {
        self.inner.write_to_clipboard(item)
    }

    fn read_from_primary(&self) -> Option<ClipboardItem> {
        self.inner.read_from_primary()
    }

    fn read_from_clipboard(&self) -> Option<ClipboardItem> {
        self.inner.read_from_clipboard()
    }

    fn add_recent_document(&self, _path: &Path) {}
}

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn open_uri_internal(
    executor: BackgroundExecutor,
    uri: &str,
    activation_token: Option<String>,
) {
    if let Some(uri) = ashpd::Uri::parse(uri).log_err() {
        executor
            .spawn(async move {
                let mut xdg_open_failed = false;
                for mut command in open::commands(uri.to_string()) {
                    if let Some(token) = activation_token.as_ref() {
                        command.env("XDG_ACTIVATION_TOKEN", token);
                    }
                    let program = format!("{:?}", command.get_program());
                    match smol::process::Command::from(command).spawn() {
                        Ok(mut cmd) => match cmd.status().await {
                            Ok(status) if status.success() => return,
                            Ok(status) => {
                                log::error!("Command {} exited with status: {}", program, status);
                                xdg_open_failed = true;
                            }
                            Err(e) => {
                                log::error!("Failed to get status from {}: {}", program, e);
                                xdg_open_failed = true;
                            }
                        },
                        Err(e) => {
                            log::error!("Failed to open with {}: {}", program, e);
                            xdg_open_failed = true;
                        }
                    }
                }

                if xdg_open_failed {
                    match ashpd::desktop::open_uri::OpenFileRequest::default()
                        .activation_token(activation_token.map(ashpd::ActivationToken::from))
                        .send_uri(&uri)
                        .await
                        .and_then(|e| e.response())
                    {
                        Ok(()) => {}
                        Err(ashpd::Error::Response(ashpd::desktop::ResponseError::Cancelled)) => {}
                        Err(e) => {
                            log::error!("Failed to open with dbus: {}", e);
                        }
                    }
                }
            })
            .detach();
    }
}

#[cfg(any(feature = "x11", feature = "wayland"))]
pub(super) fn reveal_path_internal(
    executor: BackgroundExecutor,
    path: PathBuf,
    activation_token: Option<String>,
) {
    executor
        .spawn(async move {
            if let Some(dir) = File::open(path.clone()).log_err() {
                match ashpd::desktop::open_uri::OpenDirectoryRequest::default()
                    .activation_token(activation_token.map(ashpd::ActivationToken::from))
                    .send(&dir.as_fd())
                    .await
                {
                    Ok(_) => return,
                    Err(e) => log::error!("Failed to open with dbus: {}", e),
                }
                if path.is_dir() {
                    open::that_detached(path).log_err();
                } else {
                    open::that_detached(path.parent().unwrap_or(Path::new(""))).log_err();
                }
            }
        })
        .detach();
}

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn is_within_click_distance(a: Point<Pixels>, b: Point<Pixels>) -> bool {
    let diff = a - b;
    diff.x.abs() <= DOUBLE_CLICK_DISTANCE && diff.y.abs() <= DOUBLE_CLICK_DISTANCE
}

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn get_xkb_compose_state(cx: &xkb::Context) -> Option<xkb::compose::State> {
    let mut locales = Vec::default();
    if let Some(locale) = env::var_os("LC_CTYPE") {
        locales.push(locale);
    }
    locales.push(OsString::from("C"));
    let mut state: Option<xkb::compose::State> = None;
    for locale in locales {
        if let Ok(table) =
            xkb::compose::Table::new_from_locale(cx, &locale, xkb::compose::COMPILE_NO_FLAGS)
        {
            state = Some(xkb::compose::State::new(
                &table,
                xkb::compose::STATE_NO_FLAGS,
            ));
            break;
        }
    }
    state
}

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) unsafe fn read_fd(fd: filedescriptor::FileDescriptor) -> Result<Vec<u8>> {
    let mut file = unsafe { File::from_raw_fd(fd.into_raw_fd()) };
    let mut buffer = Vec::new();
    file.read_to_end(&mut buffer)?;
    Ok(buffer)
}

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) const DEFAULT_CURSOR_ICON_NAME: &str = "left_ptr";

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn cursor_style_to_icon_names(style: CursorStyle) -> &'static [&'static str] {
    // Based on cursor names from chromium:
    // https://github.com/chromium/chromium/blob/d3069cf9c973dc3627fa75f64085c6a86c8f41bf/ui/base/cursor/cursor_factory.cc#L113
    match style {
        CursorStyle::Arrow => &[DEFAULT_CURSOR_ICON_NAME],
        CursorStyle::IBeam => &["text", "xterm"],
        CursorStyle::Crosshair => &["crosshair", "cross"],
        CursorStyle::ClosedHand => &["closedhand", "grabbing", "hand2"],
        CursorStyle::OpenHand => &["openhand", "grab", "hand1"],
        CursorStyle::PointingHand => &["pointer", "hand", "hand2"],
        CursorStyle::ResizeLeft => &["w-resize", "left_side"],
        CursorStyle::ResizeRight => &["e-resize", "right_side"],
        CursorStyle::ResizeLeftRight => &["ew-resize", "sb_h_double_arrow"],
        CursorStyle::ResizeUp => &["n-resize", "top_side"],
        CursorStyle::ResizeDown => &["s-resize", "bottom_side"],
        CursorStyle::ResizeUpDown => &["sb_v_double_arrow", "ns-resize"],
        CursorStyle::ResizeUpLeftDownRight => &["size_fdiag", "bd_double_arrow", "nwse-resize"],
        CursorStyle::ResizeUpRightDownLeft => &["size_bdiag", "nesw-resize", "fd_double_arrow"],
        CursorStyle::ResizeColumn => &["col-resize", "sb_h_double_arrow"],
        CursorStyle::ResizeRow => &["row-resize", "sb_v_double_arrow"],
        CursorStyle::IBeamCursorForVerticalLayout => &["vertical-text"],
        CursorStyle::OperationNotAllowed => &["not-allowed", "crossed_circle"],
        CursorStyle::DragLink => &["alias"],
        CursorStyle::DragCopy => &["copy"],
        CursorStyle::ContextualMenu => &["context-menu"],
    }
}

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn log_cursor_icon_warning(message: impl std::fmt::Display) {
    if let Ok(xcursor_path) = env::var("XCURSOR_PATH") {
        log::warn!(
            "{:#}\ncursor icon loading may be failing if XCURSOR_PATH environment variable is invalid. \
                    XCURSOR_PATH overrides the default icon search. Its current value is '{}'",
            message,
            xcursor_path
        );
    } else {
        log::warn!("{:#}", message);
    }
}

#[cfg(any(feature = "wayland", feature = "x11"))]
fn guess_ascii(keycode: Keycode, shift: bool) -> Option<char> {
    let c = match (keycode.raw(), shift) {
        (24, _) => 'q',
        (25, _) => 'w',
        (26, _) => 'e',
        (27, _) => 'r',
        (28, _) => 't',
        (29, _) => 'y',
        (30, _) => 'u',
        (31, _) => 'i',
        (32, _) => 'o',
        (33, _) => 'p',
        (34, false) => '[',
        (34, true) => '{',
        (35, false) => ']',
        (35, true) => '}',
        (38, _) => 'a',
        (39, _) => 's',
        (40, _) => 'd',
        (41, _) => 'f',
        (42, _) => 'g',
        (43, _) => 'h',
        (44, _) => 'j',
        (45, _) => 'k',
        (46, _) => 'l',
        (47, false) => ';',
        (47, true) => ':',
        (48, false) => '\'',
        (48, true) => '"',
        (49, false) => '`',
        (49, true) => '~',
        (51, false) => '\\',
        (51, true) => '|',
        (52, _) => 'z',
        (53, _) => 'x',
        (54, _) => 'c',
        (55, _) => 'v',
        (56, _) => 'b',
        (57, _) => 'n',
        (58, _) => 'm',
        (59, false) => ',',
        (59, true) => '>',
        (60, false) => '.',
        (60, true) => '<',
        (61, false) => '/',
        (61, true) => '?',

        _ => return None,
    };

    Some(c)
}

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn keystroke_from_xkb(
    state: &State,
    mut modifiers: gpui::Modifiers,
    keycode: Keycode,
) -> gpui::Keystroke {
    let key_utf32 = state.key_get_utf32(keycode);
    let key_utf8 = state.key_get_utf8(keycode);
    let key_sym = state.key_get_one_sym(keycode);

    let key = match key_sym {
        Keysym::Return => "enter".to_owned(),
        Keysym::Prior => "pageup".to_owned(),
        Keysym::Next => "pagedown".to_owned(),
        Keysym::ISO_Left_Tab => "tab".to_owned(),
        Keysym::KP_Prior => "pageup".to_owned(),
        Keysym::KP_Next => "pagedown".to_owned(),
        Keysym::XF86_Back => "back".to_owned(),
        Keysym::XF86_Forward => "forward".to_owned(),
        Keysym::XF86_Cut => "cut".to_owned(),
        Keysym::XF86_Copy => "copy".to_owned(),
        Keysym::XF86_Paste => "paste".to_owned(),
        Keysym::XF86_New => "new".to_owned(),
        Keysym::XF86_Open => "open".to_owned(),
        Keysym::XF86_Save => "save".to_owned(),

        Keysym::comma => ",".to_owned(),
        Keysym::period => ".".to_owned(),
        Keysym::less => "<".to_owned(),
        Keysym::greater => ">".to_owned(),
        Keysym::slash => "/".to_owned(),
        Keysym::question => "?".to_owned(),

        Keysym::semicolon => ";".to_owned(),
        Keysym::colon => ":".to_owned(),
        Keysym::apostrophe => "'".to_owned(),
        Keysym::quotedbl => "\"".to_owned(),

        Keysym::bracketleft => "[".to_owned(),
        Keysym::braceleft => "{".to_owned(),
        Keysym::bracketright => "]".to_owned(),
        Keysym::braceright => "}".to_owned(),
        Keysym::backslash => "\\".to_owned(),
        Keysym::bar => "|".to_owned(),

        Keysym::grave => "`".to_owned(),
        Keysym::asciitilde => "~".to_owned(),
        Keysym::exclam => "!".to_owned(),
        Keysym::at => "@".to_owned(),
        Keysym::numbersign => "#".to_owned(),
        Keysym::dollar => "$".to_owned(),
        Keysym::percent => "%".to_owned(),
        Keysym::asciicircum => "^".to_owned(),
        Keysym::ampersand => "&".to_owned(),
        Keysym::asterisk => "*".to_owned(),
        Keysym::parenleft => "(".to_owned(),
        Keysym::parenright => ")".to_owned(),
        Keysym::minus => "-".to_owned(),
        Keysym::underscore => "_".to_owned(),
        Keysym::equal => "=".to_owned(),
        Keysym::plus => "+".to_owned(),
        Keysym::space => "space".to_owned(),
        Keysym::BackSpace => "backspace".to_owned(),
        Keysym::Tab => "tab".to_owned(),
        Keysym::Delete => "delete".to_owned(),
        Keysym::Escape => "escape".to_owned(),

        Keysym::Left => "left".to_owned(),
        Keysym::Right => "right".to_owned(),
        Keysym::Up => "up".to_owned(),
        Keysym::Down => "down".to_owned(),
        Keysym::Home => "home".to_owned(),
        Keysym::End => "end".to_owned(),
        Keysym::Insert => "insert".to_owned(),

        _ => {
            let name = xkb::keysym_get_name(key_sym).to_lowercase();
            if key_sym.is_keypad_key() {
                name.replace("kp_", "")
            } else if let Some(key) = key_utf8.chars().next()
                && key_utf8.len() == 1
                && key.is_ascii()
            {
                if key.is_ascii_graphic() {
                    key_utf8.to_lowercase()
                // map ctrl-a to `a`
                // ctrl-0..9 may emit control codes like ctrl-[, but
                // we don't want to map them to `[`
                } else if key_utf32 <= 0x1f
                    && !name.chars().next().is_some_and(|c| c.is_ascii_digit())
                {
                    ((key_utf32 as u8 + 0x40) as char)
                        .to_ascii_lowercase()
                        .to_string()
                } else {
                    name
                }
            } else if let Some(key_en) = guess_ascii(keycode, modifiers.shift) {
                String::from(key_en)
            } else {
                name
            }
        }
    };

    if modifiers.shift {
        // we only include the shift for upper-case letters by convention,
        // so don't include for numbers and symbols, but do include for
        // tab/enter, etc.
        if key.chars().count() == 1 && key.to_lowercase() == key.to_uppercase() {
            modifiers.shift = false;
        }
    }

    // Ignore control characters (and DEL) for the purposes of key_char
    let key_char =
        (key_utf32 >= 32 && key_utf32 != 127 && !key_utf8.is_empty()).then_some(key_utf8);

    gpui::Keystroke {
        modifiers,
        key,
        key_char,
    }
}

/**
 * Returns which symbol the dead key represents
 * <https://developer.mozilla.org/en-US/docs/Web/API/UI_Events/Keyboard_event_key_values#dead_keycodes_for_linux>
 */
#[cfg(any(feature = "wayland", feature = "x11"))]
pub fn keystroke_underlying_dead_key(keysym: Keysym) -> Option<String> {
    match keysym {
        Keysym::dead_grave => Some("`".to_owned()),
        Keysym::dead_acute => Some("´".to_owned()),
        Keysym::dead_circumflex => Some("^".to_owned()),
        Keysym::dead_tilde => Some("~".to_owned()),
        Keysym::dead_macron => Some("¯".to_owned()),
        Keysym::dead_breve => Some("˘".to_owned()),
        Keysym::dead_abovedot => Some("˙".to_owned()),
        Keysym::dead_diaeresis => Some("¨".to_owned()),
        Keysym::dead_abovering => Some("˚".to_owned()),
        Keysym::dead_doubleacute => Some("˝".to_owned()),
        Keysym::dead_caron => Some("ˇ".to_owned()),
        Keysym::dead_cedilla => Some("¸".to_owned()),
        Keysym::dead_ogonek => Some("˛".to_owned()),
        Keysym::dead_iota => Some("ͅ".to_owned()),
        Keysym::dead_voiced_sound => Some("゙".to_owned()),
        Keysym::dead_semivoiced_sound => Some("゚".to_owned()),
        Keysym::dead_belowdot => Some("̣̣".to_owned()),
        Keysym::dead_hook => Some("̡".to_owned()),
        Keysym::dead_horn => Some("̛".to_owned()),
        Keysym::dead_stroke => Some("̶̶".to_owned()),
        Keysym::dead_abovecomma => Some("̓̓".to_owned()),
        Keysym::dead_abovereversedcomma => Some("ʽ".to_owned()),
        Keysym::dead_doublegrave => Some("̏".to_owned()),
        Keysym::dead_belowring => Some("˳".to_owned()),
        Keysym::dead_belowmacron => Some("̱".to_owned()),
        Keysym::dead_belowcircumflex => Some("ꞈ".to_owned()),
        Keysym::dead_belowtilde => Some("̰".to_owned()),
        Keysym::dead_belowbreve => Some("̮".to_owned()),
        Keysym::dead_belowdiaeresis => Some("̤".to_owned()),
        Keysym::dead_invertedbreve => Some("̯".to_owned()),
        Keysym::dead_belowcomma => Some("̦".to_owned()),
        Keysym::dead_currency => None,
        Keysym::dead_lowline => None,
        Keysym::dead_aboveverticalline => None,
        Keysym::dead_belowverticalline => None,
        Keysym::dead_longsolidusoverlay => None,
        Keysym::dead_a => None,
        Keysym::dead_A => None,
        Keysym::dead_e => None,
        Keysym::dead_E => None,
        Keysym::dead_i => None,
        Keysym::dead_I => None,
        Keysym::dead_o => None,
        Keysym::dead_O => None,
        Keysym::dead_u => None,
        Keysym::dead_U => None,
        Keysym::dead_small_schwa => Some("ə".to_owned()),
        Keysym::dead_capital_schwa => Some("Ə".to_owned()),
        Keysym::dead_greek => None,
        _ => None,
    }
}
#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn modifiers_from_xkb(keymap_state: &State) -> gpui::Modifiers {
    let shift = keymap_state.mod_name_is_active(xkb::MOD_NAME_SHIFT, xkb::STATE_MODS_EFFECTIVE);
    let alt = keymap_state.mod_name_is_active(xkb::MOD_NAME_ALT, xkb::STATE_MODS_EFFECTIVE);
    let control = keymap_state.mod_name_is_active(xkb::MOD_NAME_CTRL, xkb::STATE_MODS_EFFECTIVE);
    let platform = keymap_state.mod_name_is_active(xkb::MOD_NAME_LOGO, xkb::STATE_MODS_EFFECTIVE);
    gpui::Modifiers {
        shift,
        alt,
        control,
        platform,
        function: false,
    }
}

#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn capslock_from_xkb(keymap_state: &State) -> gpui::Capslock {
    let on = keymap_state.mod_name_is_active(xkb::MOD_NAME_CAPS, xkb::STATE_MODS_EFFECTIVE);
    gpui::Capslock { on }
}

/// Resolve a Linux `dev_t` to PCI vendor/device IDs via sysfs, returning a
/// [`CompositorGpuHint`] that the GPU adapter selection code can use to
/// prioritize the compositor's rendering device.
#[cfg(any(feature = "wayland", feature = "x11"))]
pub(super) fn compositor_gpu_hint_from_dev_t(dev: u64) -> Option<gpui_wgpu::CompositorGpuHint> {
    fn dev_major(dev: u64) -> u32 {
        ((dev >> 8) & 0xfff) as u32 | (((dev >> 32) & !0xfff) as u32)
    }

    fn dev_minor(dev: u64) -> u32 {
        (dev & 0xff) as u32 | (((dev >> 12) & !0xff) as u32)
    }

    fn read_sysfs_hex_id(path: &str) -> Option<u32> {
        let content = std::fs::read_to_string(path).ok()?;
        let trimmed = content.trim().strip_prefix("0x").unwrap_or(content.trim());
        u32::from_str_radix(trimmed, 16).ok()
    }

    let major = dev_major(dev);
    let minor = dev_minor(dev);

    let vendor_path = format!("/sys/dev/char/{major}:{minor}/device/vendor");
    let device_path = format!("/sys/dev/char/{major}:{minor}/device/device");

    let vendor_id = read_sysfs_hex_id(&vendor_path)?;
    let device_id = read_sysfs_hex_id(&device_path)?;

    log::info!(
        "Compositor GPU hint: vendor={:#06x}, device={:#06x} (from dev {major}:{minor})",
        vendor_id,
        device_id,
    );

    Some(gpui_wgpu::CompositorGpuHint {
        vendor_id,
        device_id,
    })
}

#[cfg(test)]
mod tests {
    use super::*;
    use gpui::{Point, px};

    #[test]
    fn test_is_within_click_distance() {
        let zero = Point::new(px(0.0), px(0.0));
        assert!(is_within_click_distance(zero, Point::new(px(5.0), px(5.0))));
        assert!(is_within_click_distance(
            zero,
            Point::new(px(-4.9), px(5.0))
        ));
        assert!(is_within_click_distance(
            Point::new(px(3.0), px(2.0)),
            Point::new(px(-2.0), px(-2.0))
        ));
        assert!(!is_within_click_distance(
            zero,
            Point::new(px(5.0), px(5.1))
        ),);
    }
}
