package kernel.ui;

import util.Pos;
using tink.CoreApi;

import util.Color;
import kernel.ButtonType;
import util.Vec.Vec2;
import kernel.ui.TermWriteable;

/**
	The main object you interact with when writing anything to the screen.
**/
class WindowContext implements TermWriteable {
	private final writer:VirtualTermWriter;

	public var onClick(default, null):Signal<{button:ButtonType, pos:Pos}>;
	public var onKey(default, null):Signal<{keyCode:Int, isHeld:Bool}>;
	public var onKeyUp(default, null):Signal<Int>;
	public var onMouseDrag(default, null):Signal<{button:ButtonType, pos:Pos}>;
	public var onMouseScroll(default, null):Signal<{dir:Int, pos:Pos}>;
	public var onMouseUp(default, null):Signal<{button:ButtonType, pos:Pos}>;
	public var onPaste(default, null):Signal<String>;

	@:allow(kernel.ui.WindowManager) private final onClickTrigger:SignalTrigger<{button:ButtonType, pos:Pos}>;
	@:allow(kernel.ui.WindowManager) private final onKeyTrigger:SignalTrigger<{keyCode:Int, isHeld:Bool}>;
	@:allow(kernel.ui.WindowManager) private final onKeyUpTrigger:SignalTrigger<Int>;
	@:allow(kernel.ui.WindowManager) private final onMouseDragTrigger:SignalTrigger<{button:ButtonType, pos:Pos}>;
	@:allow(kernel.ui.WindowManager) private final onMouseScrollTrigger:SignalTrigger<{dir:Int, pos:Pos}>;
	@:allow(kernel.ui.WindowManager) private final onMouseUpTrigger:SignalTrigger<{button:ButtonType, pos:Pos}>;
	@:allow(kernel.ui.WindowManager) private final onPasteTrigger:SignalTrigger<String>;

	@:allow(kernel.ui.WindowManager)
	private function new(writer:VirtualTermWriter) {
		this.writer = writer;
		this.onResize = writer.onResize;

		this.onClickTrigger = Signal.trigger();
		this.onKeyTrigger = Signal.trigger();
		this.onKeyUpTrigger = Signal.trigger();
		this.onMouseDragTrigger = Signal.trigger();
		this.onMouseScrollTrigger = Signal.trigger();
		this.onMouseUpTrigger = Signal.trigger();
		this.onPasteTrigger = Signal.trigger();

		this.onClick = onClickTrigger.asSignal();
		this.onKey = onKeyTrigger.asSignal();
		this.onKeyUp = onKeyUpTrigger.asSignal();
		this.onMouseDrag = onMouseDragTrigger.asSignal();
		this.onMouseScroll = onMouseScrollTrigger.asSignal();
		this.onMouseUp = onMouseUpTrigger.asSignal();
		this.onPaste = onPasteTrigger.asSignal();
	}

	public var onResize(default, null):Signal<Vec2<Int>>;

	@:allow(kernel.ui)
	private function setTarget(target:TermWriteable) {
		writer.setTarget(target);
	}

	@:allow(kernel.ui)
	private function enable() {
		writer.enable();
	}

	@:allow(kernel.ui)
	private function disable() {
		writer.disable();
	}

	@:allow(kernel.ui)
	private function isEnabled() {
		return writer.isEnabled();
	}

	public function write(text:String) {
		writer.write(text);
	}

	public function scroll(y:Int) {
		writer.scroll(y);
	}

	public function getCursorPos():Pos {
		return writer.getCursorPos();
	}

	public function setCursorPos(x:Int, y:Int) {
		writer.setCursorPos(x, y);
	}

	public function getCursorBlink():Bool {
		return writer.getCursorBlink();
	}

	public function setCursorBlink(blink:Bool) {
		writer.setCursorBlink(blink);
	}

	public function getSize():Vec2<Int> {
		return writer.getSize();
	}

	public function clear() {
		writer.clear();
	}

	public function clearLine() {
		writer.clearLine();
	}

	public function getTextColor():Color {
		return writer.getTextColor();
	}

	public function setTextColor(colour:Color) {
		writer.setTextColor(colour);
	}

	public function getBackgroundColor():Color {
		return writer.getBackgroundColor();
	}

	public function setBackgroundColor(color:Color) {
		writer.setBackgroundColor(color);
	}

	public function isColor():Bool {
		return writer.isColor();
	}

	public function reset() {
		writer.reset();
	}
}