// ==UserScript==
// @name        Cycle through color palettes with dot key
// @namespace   Violentmonkey Scripts
// @icon        data:image/png;base64,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
// @version     1.0.0
//
// @match       https://sudokupad.app/*
// @grant       none
//
// @author      Marcus Jaschen
// @description Add a keyboard shortcut which allows cycling through the three color palettes.
// ==/UserScript==


(function () {
	'use strict';

	const PALETTE_BUTTON_SELECTOR = 'button.palettebutton[data-control="selectpalette"]';

	// SudokuPad creates the palette button only while the color entry method is
	// active (ToolColor.createPaletteButton() / .removePaletteButton()), so the
	// presence of the button in the DOM is the mode check.
	const getPaletteButton = () => {
		const button = document.querySelector(PALETTE_BUTTON_SELECTOR);
		if (button === null) return null;
		const visible = button.offsetParent !== null || button.getClientRects().length > 0;
		return visible ? button : null;
	};

	const isTypingTarget = target => {
		if (!(target instanceof Element)) return false;
		if (target.isContentEditable) return true;
		return /^(input|textarea|select)$/i.test(target.tagName);
	};

	const isDialogOpen = () => document.querySelector('.dialog-overlay') !== null;

	const isDotKey = event => event.key === '.' || event.code === 'NumpadDecimal';

	// The button's handler is registered via addDownEventHandler(), i.e. on
	// 'mousedown'/'touchstart' — element.click() would not trigger it.
	const pressPaletteButton = button => {
		button.dispatchEvent(new MouseEvent('mousedown', {
			bubbles: true,
			cancelable: true,
			view: window,
			button: 0,
		}));
	};

	const handleKeyDown = event => {
		if (!isDotKey(event)) return;
		if (event.repeat) return;
		if (event.ctrlKey || event.altKey || event.metaKey) return;
		if (isTypingTarget(event.target)) return;
		if (isDialogOpen()) return;

		const button = getPaletteButton();
		if (button === null) return;

		event.preventDefault();
		event.stopPropagation();
		pressPaletteButton(button);
	};

	document.addEventListener('keydown', handleKeyDown, {capture: true});
})();