package tomo

import "image"
import "git.tebibyte.media/sashakoshka/tomo/data"

// TODO: add support for the icon window because imagine if we allowed
// applications to display live updating information readouts on their icons.
// that would be baller

// Window represents a top-level container generated by the currently running
// backend. It can contain a single element. It is hidden by default, and must
// be explicitly shown with the Show() method.
type Window interface {
	// Adopt sets the root element of the window. There can only be one of
	// these at one time.
	Adopt (Element)

	// Child returns the root element of the window.
	Child () Element

	// SetTitle sets the title that appears on the window's title bar. This
	// method might have no effect with some backends.
	SetTitle (string)

	// SetApplicationName sets the name of the application that this window
	// belongs to. This method might have no effect with some backends.
	SetApplicationName (string)

	// SetIcon taks in a list different sizes of the same icon and selects
	// the best one to display on the window title bar, dock, or whatever is
	// applicable for the given backend. This method might have no effect
	// for some backends.
	SetIcon (sizes []image.Image)

	// NewModal creates a new modal dialog window. The resulting window will
	// inherit this window's application name and icon, but these can be
	// manually overridden. The modal will be placed relative to the parent
	// window, but this position may be overridden by the backend or
	// operating system.
	NewModal (bounds image.Rectangle) (Window, error)

	// NewMenu creates a new temporary window for things like dropdown or
	// context menus. It automatically closes when the user presses escape
	// or clicks outside of it. Like NewModal, the pulldown window will
	// inherit this window's application name and icon, and will be
	// positioned relative to it.
	NewMenu (bounds image.Rectangle) (MenuWindow, error)
	
	// Copy puts data into the clipboard.
	Copy (data.Data)

	// Paste requests the data currently in the clipboard. When the data is
	// available, the callback is called with the clipboard data. If there
	// was no data matching the requested mime type found, nil is passed to
	// the callback instead.
	Paste (callback func (data.Data, error), accept ...data.Mime)

	// Show shows the window. The window starts off hidden, so this must be
	// called after initial setup to make sure it is visible.
	Show ()

	// Hide hides the window.
	Hide ()

	// Close closes the window.
	Close ()

	// OnClose specifies a function to be called when the window is closed.
	OnClose (func ())
}

// MainWindow is a window capable of owning multiple sub-windows.
type MainWindow interface {
	Window

	// NewPanel creates a panel window that is semantically tied to this
	// window, positioned relative to it. This is intended to be used for
	// utility windows, tool bars, torn-off menus, etc. The resulting window
	// will inherit this window's application name and icon, but these can
	// be manually overridden.
	NewPanel (bounds image.Rectangle) (Window, error)
}

// MenuWindow is a temporary window that automatically closes when the user
// presses escape or clicks outside of it.
type MenuWindow interface {
	Window

	// Pin converts this window into a panel, pinning it to the screen.
	Pin ()
}