// Copyright 2019-2021 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

use std::{
  collections::hash_map::DefaultHasher,
  fmt,
  hash::{Hash, Hasher},
};

pub type MenuHash = u16;
pub type MenuId = String;
pub type MenuIdRef<'a> = &'a str;

/// Named images defined by the system.
#[cfg(target_os = "macos")]
#[cfg_attr(doc_cfg, doc(cfg(target_os = "macos")))]
#[derive(Debug, Clone)]
pub enum NativeImage {
  /// An add item template image.
  Add,
  /// Advanced preferences toolbar icon for the preferences window.
  Advanced,
  /// A Bluetooth template image.
  Bluetooth,
  /// Bookmarks image suitable for a template.
  Bookmarks,
  /// A caution image.
  Caution,
  /// A color panel toolbar icon.
  ColorPanel,
  /// A column view mode template image.
  ColumnView,
  /// A computer icon.
  Computer,
  /// An enter full-screen mode template image.
  EnterFullScreen,
  /// Permissions for all users.
  Everyone,
  /// An exit full-screen mode template image.
  ExitFullScreen,
  /// A cover flow view mode template image.
  FlowView,
  /// A folder image.
  Folder,
  /// A burnable folder icon.
  FolderBurnable,
  /// A smart folder icon.
  FolderSmart,
  /// A link template image.
  FollowLinkFreestanding,
  /// A font panel toolbar icon.
  FontPanel,
  /// A `go back` template image.
  GoLeft,
  /// A `go forward` template image.
  GoRight,
  /// Home image suitable for a template.
  Home,
  /// An iChat Theater template image.
  IChatTheater,
  /// An icon view mode template image.
  IconView,
  /// An information toolbar icon.
  Info,
  /// A template image used to denote invalid data.
  InvalidDataFreestanding,
  /// A generic left-facing triangle template image.
  LeftFacingTriangle,
  /// A list view mode template image.
  ListView,
  /// A locked padlock template image.
  LockLocked,
  /// An unlocked padlock template image.
  LockUnlocked,
  /// A horizontal dash, for use in menus.
  MenuMixedState,
  /// A check mark template image, for use in menus.
  MenuOnState,
  /// A MobileMe icon.
  MobileMe,
  /// A drag image for multiple items.
  MultipleDocuments,
  /// A network icon.
  Network,
  /// A path button template image.
  Path,
  /// General preferences toolbar icon for the preferences window.
  PreferencesGeneral,
  /// A Quick Look template image.
  QuickLook,
  /// A refresh template image.
  RefreshFreestanding,
  /// A refresh template image.
  Refresh,
  /// A remove item template image.
  Remove,
  /// A reveal contents template image.
  RevealFreestanding,
  /// A generic right-facing triangle template image.
  RightFacingTriangle,
  /// A share view template image.
  Share,
  /// A slideshow template image.
  Slideshow,
  /// A badge for a `smart` item.
  SmartBadge,
  /// Small green indicator, similar to iChat’s available image.
  StatusAvailable,
  /// Small clear indicator.
  StatusNone,
  /// Small yellow indicator, similar to iChat’s idle image.
  StatusPartiallyAvailable,
  /// Small red indicator, similar to iChat’s unavailable image.
  StatusUnavailable,
  /// A stop progress template image.
  StopProgressFreestanding,
  /// A stop progress button template image.
  StopProgress,

  /// An image of the empty trash can.
  TrashEmpty,
  /// An image of the full trash can.
  TrashFull,
  /// Permissions for a single user.
  User,
  /// User account toolbar icon for the preferences window.
  UserAccounts,
  /// Permissions for a group of users.
  UserGroup,
  /// Permissions for guests.
  UserGuest,
}

#[derive(Debug, Clone)]
pub enum MenuUpdate {
  /// Modifies the enabled state of the menu item.
  SetEnabled(bool),
  /// Modifies the title (label) of the menu item.
  SetTitle(String),
  /// Modifies the selected state of the menu item.
  SetSelected(bool),
  /// Update native image.
  #[cfg(target_os = "macos")]
  #[cfg_attr(doc_cfg, doc(cfg(target_os = "macos")))]
  SetNativeImage(NativeImage),
}

pub trait TrayHandle: fmt::Debug + Clone + Send + Sync {
  fn set_icon(&self, icon: crate::Icon) -> crate::Result<()>;
  fn set_menu(&self, menu: crate::menu::SystemTrayMenu) -> crate::Result<()>;
  fn update_item(&self, id: u16, update: MenuUpdate) -> crate::Result<()>;
  #[cfg(target_os = "macos")]
  fn set_icon_as_template(&self, is_template: bool) -> crate::Result<()>;
  fn destroy(&self) -> crate::Result<()>;
}

/// A window menu.
#[derive(Debug, Default, Clone)]
#[non_exhaustive]
pub struct Menu {
  pub items: Vec<MenuEntry>,
}

#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct Submenu {
  pub title: String,
  pub enabled: bool,
  pub inner: Menu,
}

impl Submenu {
  /// Creates a new submenu with the given title and menu items.
  pub fn new<S: Into<String>>(title: S, menu: Menu) -> Self {
    Self {
      title: title.into(),
      enabled: true,
      inner: menu,
    }
  }
}

impl Menu {
  /// Creates a new window menu.
  pub fn new() -> Self {
    Default::default()
  }

  /// Creates a menu filled with default menu items and submenus.
  ///
  /// ## Platform-specific:
  ///
  /// - **Windows**:
  ///   - File
  ///     - CloseWindow
  ///     - Quit
  ///   - Edit
  ///     - Cut
  ///     - Copy
  ///     - Paste
  ///   - Window
  ///     - Minimize
  ///     - CloseWindow
  ///
  /// - **Linux**:
  ///   - File
  ///     - CloseWindow
  ///     - Quit
  ///   - Window
  ///     - Minimize
  ///     - CloseWindow
  ///
  /// - **macOS**:
  ///   - App
  ///     - About
  ///     - Separator
  ///     - Services
  ///     - Separator
  ///     - Hide
  ///     - HideOthers
  ///     - ShowAll
  ///     - Separator
  ///     - Quit
  ///   - File
  ///     - CloseWindow
  ///   - Edit
  ///     - Undo
  ///     - Redo
  ///     - Separator
  ///     - Cut
  ///     - Copy
  ///     - Paste
  ///     - SelectAll
  ///   - View
  ///     - EnterFullScreen
  ///   - Window
  ///     - Minimize
  ///     - Zoom
  ///     - Separator
  ///     - CloseWindow
  pub fn os_default(#[allow(unused)] app_name: &str) -> Self {
    let mut menu = Menu::new();
    #[cfg(target_os = "macos")]
    {
      menu = menu.add_submenu(Submenu::new(
        app_name,
        Menu::new()
          .add_native_item(MenuItem::About(
            app_name.to_string(),
            AboutMetadata::default(),
          ))
          .add_native_item(MenuItem::Separator)
          .add_native_item(MenuItem::Services)
          .add_native_item(MenuItem::Separator)
          .add_native_item(MenuItem::Hide)
          .add_native_item(MenuItem::HideOthers)
          .add_native_item(MenuItem::ShowAll)
          .add_native_item(MenuItem::Separator)
          .add_native_item(MenuItem::Quit),
      ));
    }

    let mut file_menu = Menu::new();
    file_menu = file_menu.add_native_item(MenuItem::CloseWindow);
    #[cfg(not(target_os = "macos"))]
    {
      file_menu = file_menu.add_native_item(MenuItem::Quit);
    }
    menu = menu.add_submenu(Submenu::new("File", file_menu));

    #[cfg(not(target_os = "linux"))]
    let mut edit_menu = Menu::new();
    #[cfg(target_os = "macos")]
    {
      edit_menu = edit_menu.add_native_item(MenuItem::Undo);
      edit_menu = edit_menu.add_native_item(MenuItem::Redo);
      edit_menu = edit_menu.add_native_item(MenuItem::Separator);
    }
    #[cfg(not(target_os = "linux"))]
    {
      edit_menu = edit_menu.add_native_item(MenuItem::Cut);
      edit_menu = edit_menu.add_native_item(MenuItem::Copy);
      edit_menu = edit_menu.add_native_item(MenuItem::Paste);
    }
    #[cfg(target_os = "macos")]
    {
      edit_menu = edit_menu.add_native_item(MenuItem::SelectAll);
    }
    #[cfg(not(target_os = "linux"))]
    {
      menu = menu.add_submenu(Submenu::new("Edit", edit_menu));
    }
    #[cfg(target_os = "macos")]
    {
      menu = menu.add_submenu(Submenu::new(
        "View",
        Menu::new().add_native_item(MenuItem::EnterFullScreen),
      ));
    }

    let mut window_menu = Menu::new();
    window_menu = window_menu.add_native_item(MenuItem::Minimize);
    #[cfg(target_os = "macos")]
    {
      window_menu = window_menu.add_native_item(MenuItem::Zoom);
      window_menu = window_menu.add_native_item(MenuItem::Separator);
    }
    window_menu = window_menu.add_native_item(MenuItem::CloseWindow);
    menu = menu.add_submenu(Submenu::new("Window", window_menu));

    menu
  }

  /// Creates a new window menu with the given items.
  ///
  /// # Examples
  /// ```
  /// # use tauri_runtime::menu::{Menu, MenuItem, CustomMenuItem, Submenu};
  /// Menu::with_items([
  ///   MenuItem::SelectAll.into(),
  ///   #[cfg(target_os = "macos")]
  ///   MenuItem::Redo.into(),
  ///   CustomMenuItem::new("toggle", "Toggle visibility").into(),
  ///   Submenu::new("View", Menu::new()).into(),
  /// ]);
  /// ```
  pub fn with_items<I: IntoIterator<Item = MenuEntry>>(items: I) -> Self {
    Self {
      items: items.into_iter().collect(),
    }
  }

  /// Adds the custom menu item to the menu.
  #[must_use]
  pub fn add_item(mut self, item: CustomMenuItem) -> Self {
    self.items.push(MenuEntry::CustomItem(item));
    self
  }

  /// Adds a native item to the menu.
  #[must_use]
  pub fn add_native_item(mut self, item: MenuItem) -> Self {
    self.items.push(MenuEntry::NativeItem(item));
    self
  }

  /// Adds an entry with submenu.
  #[must_use]
  pub fn add_submenu(mut self, submenu: Submenu) -> Self {
    self.items.push(MenuEntry::Submenu(submenu));
    self
  }
}

/// A custom menu item.
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct CustomMenuItem {
  pub id: MenuHash,
  pub id_str: MenuId,
  pub title: String,
  pub keyboard_accelerator: Option<String>,
  pub enabled: bool,
  pub selected: bool,
  #[cfg(target_os = "macos")]
  pub native_image: Option<NativeImage>,
}

impl CustomMenuItem {
  /// Create new custom menu item.
  pub fn new<I: Into<String>, T: Into<String>>(id: I, title: T) -> Self {
    let id_str = id.into();
    Self {
      id: Self::hash(&id_str),
      id_str,
      title: title.into(),
      keyboard_accelerator: None,
      enabled: true,
      selected: false,
      #[cfg(target_os = "macos")]
      native_image: None,
    }
  }

  /// Assign a keyboard shortcut to the menu action.
  #[must_use]
  pub fn accelerator<T: Into<String>>(mut self, accelerator: T) -> Self {
    self.keyboard_accelerator.replace(accelerator.into());
    self
  }

  #[cfg(target_os = "macos")]
  #[cfg_attr(doc_cfg, doc(cfg(target_os = "macos")))]
  #[must_use]
  /// A native image do render on the menu item.
  pub fn native_image(mut self, image: NativeImage) -> Self {
    self.native_image.replace(image);
    self
  }

  /// Mark the item as disabled.
  #[must_use]
  pub fn disabled(mut self) -> Self {
    self.enabled = false;
    self
  }

  /// Mark the item as selected.
  #[must_use]
  pub fn selected(mut self) -> Self {
    self.selected = true;
    self
  }

  fn hash(id: &str) -> MenuHash {
    let mut hasher = DefaultHasher::new();
    id.hash(&mut hasher);
    hasher.finish() as MenuHash
  }
}

/// A system tray menu.
#[derive(Debug, Default, Clone)]
#[non_exhaustive]
pub struct SystemTrayMenu {
  pub items: Vec<SystemTrayMenuEntry>,
}

#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct SystemTraySubmenu {
  pub title: String,
  pub enabled: bool,
  pub inner: SystemTrayMenu,
}

impl SystemTraySubmenu {
  /// Creates a new submenu with the given title and menu items.
  pub fn new<S: Into<String>>(title: S, menu: SystemTrayMenu) -> Self {
    Self {
      title: title.into(),
      enabled: true,
      inner: menu,
    }
  }
}

impl SystemTrayMenu {
  /// Creates a new system tray menu.
  pub fn new() -> Self {
    Default::default()
  }

  /// Adds the custom menu item to the system tray menu.
  #[must_use]
  pub fn add_item(mut self, item: CustomMenuItem) -> Self {
    self.items.push(SystemTrayMenuEntry::CustomItem(item));
    self
  }

  /// Adds a native item to the system tray menu.
  #[must_use]
  pub fn add_native_item(mut self, item: SystemTrayMenuItem) -> Self {
    self.items.push(SystemTrayMenuEntry::NativeItem(item));
    self
  }

  /// Adds an entry with submenu.
  #[must_use]
  pub fn add_submenu(mut self, submenu: SystemTraySubmenu) -> Self {
    self.items.push(SystemTrayMenuEntry::Submenu(submenu));
    self
  }
}

/// An entry on the system tray menu.
#[derive(Debug, Clone)]
pub enum SystemTrayMenuEntry {
  /// A custom item.
  CustomItem(CustomMenuItem),
  /// A native item.
  NativeItem(SystemTrayMenuItem),
  /// An entry with submenu.
  Submenu(SystemTraySubmenu),
}

/// System tray menu item.
#[derive(Debug, Clone)]
#[non_exhaustive]
pub enum SystemTrayMenuItem {
  /// A separator.
  Separator,
}

/// An entry on the system tray menu.
#[derive(Debug, Clone)]
pub enum MenuEntry {
  /// A custom item.
  CustomItem(CustomMenuItem),
  /// A native item.
  NativeItem(MenuItem),
  /// An entry with submenu.
  Submenu(Submenu),
}

impl From<CustomMenuItem> for MenuEntry {
  fn from(item: CustomMenuItem) -> Self {
    Self::CustomItem(item)
  }
}

impl From<MenuItem> for MenuEntry {
  fn from(item: MenuItem) -> Self {
    Self::NativeItem(item)
  }
}

impl From<Submenu> for MenuEntry {
  fn from(submenu: Submenu) -> Self {
    Self::Submenu(submenu)
  }
}

/// Application metadata for the [`MenuItem::About`] action.
///
/// ## Platform-specific
///
/// - **Windows / macOS / Android / iOS:** The metadata is ignored on these platforms.
#[derive(Debug, Clone, Default)]
#[non_exhaustive]
pub struct AboutMetadata {
  /// The application name.
  pub version: Option<String>,
  /// The authors of the application.
  pub authors: Option<Vec<String>>,
  /// Application comments.
  pub comments: Option<String>,
  /// The copyright of the application.
  pub copyright: Option<String>,
  /// The license of the application.
  pub license: Option<String>,
  /// The application website.
  pub website: Option<String>,
  /// The website label.
  pub website_label: Option<String>,
}

impl AboutMetadata {
  /// Creates the default metadata for the [`MenuItem::About`] action, which is just empty.
  pub fn new() -> Self {
    Default::default()
  }

  /// Defines the application version.
  pub fn version(mut self, version: impl Into<String>) -> Self {
    self.version.replace(version.into());
    self
  }

  /// Defines the application authors.
  pub fn authors(mut self, authors: Vec<String>) -> Self {
    self.authors.replace(authors);
    self
  }

  /// Defines the application comments.
  pub fn comments(mut self, comments: impl Into<String>) -> Self {
    self.comments.replace(comments.into());
    self
  }

  /// Defines the application copyright.
  pub fn copyright(mut self, copyright: impl Into<String>) -> Self {
    self.copyright.replace(copyright.into());
    self
  }

  /// Defines the application license.
  pub fn license(mut self, license: impl Into<String>) -> Self {
    self.license.replace(license.into());
    self
  }

  /// Defines the application version.
  pub fn website(mut self, website: impl Into<String>) -> Self {
    self.website.replace(website.into());
    self
  }

  /// Defines the application version.
  pub fn website_label(mut self, website_label: impl Into<String>) -> Self {
    self.website_label.replace(website_label.into());
    self
  }
}

/// A menu item, bound to a pre-defined action or `Custom` emit an event. Note that status bar only
/// supports `Custom` menu item variants. And on the menu bar, some platforms might not support some
/// of the variants. Unsupported variant will be no-op on such platform.
#[derive(Debug, Clone)]
#[non_exhaustive]
pub enum MenuItem {
  /// Shows a standard "About" item.
  ///
  /// The first value is the application name, and the second is its metadata.
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Android / iOS:** Unsupported
  /// - **Linux:** The metadata is only applied on Linux
  ///
  About(String, AboutMetadata),

  /// A standard "hide the app" menu item.
  ///
  /// ## Platform-specific
  ///
  /// - **Android / iOS:** Unsupported
  ///
  Hide,

  /// A standard "Services" menu item.
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Linux / Android / iOS:** Unsupported
  ///
  Services,

  /// A "hide all other windows" menu item.
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Linux / Android / iOS:** Unsupported
  ///
  HideOthers,

  /// A menu item to show all the windows for this app.
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Linux / Android / iOS:** Unsupported
  ///
  ShowAll,

  /// Close the current window.
  ///
  /// ## Platform-specific
  ///
  /// - **Android / iOS:** Unsupported
  ///
  CloseWindow,

  /// A "quit this app" menu icon.
  ///
  /// ## Platform-specific
  ///
  /// - **Android / iOS:** Unsupported
  ///
  Quit,

  /// A menu item for enabling copying (often text) from responders.
  ///
  /// ## Platform-specific
  ///
  /// - **Android / iOS / Linux:** Unsupported
  ///
  Copy,

  /// A menu item for enabling cutting (often text) from responders.
  ///
  /// ## Platform-specific
  ///
  /// - **Android / iOS / Linux:** Unsupported
  ///
  Cut,

  /// An "undo" menu item; particularly useful for supporting the cut/copy/paste/undo lifecycle
  /// of events.
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Linux / Android / iOS:** Unsupported
  ///
  Undo,

  /// An "redo" menu item; particularly useful for supporting the cut/copy/paste/undo lifecycle
  /// of events.
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Linux / Android / iOS:** Unsupported
  ///
  Redo,

  /// A menu item for selecting all (often text) from responders.
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Android / iOS / Linux:** Unsupported
  ///
  SelectAll,

  /// A menu item for pasting (often text) into responders.
  ///
  /// ## Platform-specific
  ///
  /// - **Android / iOS / Linux:** Unsupported
  ///
  Paste,

  /// A standard "enter full screen" item.
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Linux / Android / iOS:** Unsupported
  ///
  EnterFullScreen,

  /// An item for minimizing the window with the standard system controls.
  ///
  /// ## Platform-specific
  ///
  /// - **Android / iOS:** Unsupported
  ///
  Minimize,

  /// An item for instructing the app to zoom
  ///
  /// ## Platform-specific
  ///
  /// - **Windows / Linux / Android / iOS:** Unsupported
  ///
  Zoom,

  /// Represents a Separator
  ///
  /// ## Platform-specific
  ///
  /// - **Android / iOS:** Unsupported
  ///
  Separator,
}