import { defaultIconProps } from '../icon/defaults.mjs';
import { defaultIconCustomisations } from '../customisations/defaults.mjs';
import { calculateSize } from './size.mjs';
import { wrapSVGContent } from './defs.mjs';

/**
* Check if value should be unset. Allows multiple keywords
*/
const isUnsetKeyword = (value) => value === "unset" || value === "undefined" || value === "none";
/**
* Get SVG attributes and content from icon + customisations
*
* Does not generate style to make it compatible with frameworks that use objects for style, such as React.
* Instead, it generates 'inline' value. If true, rendering engine should add verticalAlign: -0.125em to icon.
*
* Customisations should be normalised by platform specific parser.
* Result should be converted to <svg> by platform specific parser.
* Use replaceIDs to generate unique IDs for body.
*/
function iconToSVG(icon, customisations) {
	const fullIcon = {
		...defaultIconProps,
		...icon
	};
	const fullCustomisations = {
		...defaultIconCustomisations,
		...customisations
	};
	const box = {
		left: fullIcon.left,
		top: fullIcon.top,
		width: fullIcon.width,
		height: fullIcon.height
	};
	let body = fullIcon.body;
	[fullIcon, fullCustomisations].forEach((props) => {
		const transformations = [];
		const hFlip = props.hFlip;
		const vFlip = props.vFlip;
		let rotation = props.rotate;
		if (hFlip) if (vFlip) rotation += 2;
		else {
			transformations.push("translate(" + (box.width + box.left).toString() + " " + (0 - box.top).toString() + ")");
			transformations.push("scale(-1 1)");
			box.top = box.left = 0;
		}
		else if (vFlip) {
			transformations.push("translate(" + (0 - box.left).toString() + " " + (box.height + box.top).toString() + ")");
			transformations.push("scale(1 -1)");
			box.top = box.left = 0;
		}
		let tempValue;
		if (rotation < 0) rotation -= Math.floor(rotation / 4) * 4;
		rotation = rotation % 4;
		switch (rotation) {
			case 1:
				tempValue = box.height / 2 + box.top;
				transformations.unshift("rotate(90 " + tempValue.toString() + " " + tempValue.toString() + ")");
				break;
			case 2:
				transformations.unshift("rotate(180 " + (box.width / 2 + box.left).toString() + " " + (box.height / 2 + box.top).toString() + ")");
				break;
			case 3:
				tempValue = box.width / 2 + box.left;
				transformations.unshift("rotate(-90 " + tempValue.toString() + " " + tempValue.toString() + ")");
				break;
		}
		if (rotation % 2 === 1) {
			if (box.left !== box.top) {
				tempValue = box.left;
				box.left = box.top;
				box.top = tempValue;
			}
			if (box.width !== box.height) {
				tempValue = box.width;
				box.width = box.height;
				box.height = tempValue;
			}
		}
		if (transformations.length) body = wrapSVGContent(body, "<g transform=\"" + transformations.join(" ") + "\">", "</g>");
	});
	const customisationsWidth = fullCustomisations.width;
	const customisationsHeight = fullCustomisations.height;
	const boxWidth = box.width;
	const boxHeight = box.height;
	let width;
	let height;
	if (customisationsWidth === null) {
		height = customisationsHeight === null ? "1em" : customisationsHeight === "auto" ? boxHeight : customisationsHeight;
		width = calculateSize(height, boxWidth / boxHeight);
	} else {
		width = customisationsWidth === "auto" ? boxWidth : customisationsWidth;
		height = customisationsHeight === null ? calculateSize(width, boxHeight / boxWidth) : customisationsHeight === "auto" ? boxHeight : customisationsHeight;
	}
	const attributes = {};
	const setAttr = (prop, value) => {
		if (!isUnsetKeyword(value)) attributes[prop] = value.toString();
	};
	setAttr("width", width);
	setAttr("height", height);
	const viewBox = [
		box.left,
		box.top,
		boxWidth,
		boxHeight
	];
	attributes.viewBox = viewBox.join(" ");
	return {
		attributes,
		viewBox,
		body
	};
}

export { iconToSVG, isUnsetKeyword };
