import { defaultExtendedIconProps } from "../icon/defaults.js";
import { getIconsTree } from "./tree.js";

/**
* Match character
*/
const matchChar = /^[a-f0-9]+(-[a-f0-9]+)*$/;
/**
* Validate icon
*
* Returns name of property that failed validation or null on success
*/
function validateIconProps(item, fix, checkOtherProps) {
	for (const key in item) {
		const attr = key;
		const value = item[attr];
		const type = typeof value;
		if (type === "undefined") {
			delete item[attr];
			continue;
		}
		const expectedType = typeof defaultExtendedIconProps[attr];
		if (expectedType !== "undefined") {
			if (type !== expectedType) {
				if (fix) {
					delete item[attr];
					continue;
				}
				return attr;
			}
			continue;
		}
		if (checkOtherProps && type === "object") if (fix) delete item[attr];
		else return key;
	}
	return null;
}
/**
* Validate icon set, return it as IconifyJSON type on success, throw error on failure
*/
function validateIconSet(obj, options) {
	const fix = !!(options && options.fix);
	if (typeof obj !== "object" || obj === null || typeof obj.icons !== "object" || !obj.icons) throw new Error("Bad icon set");
	const data = obj;
	if (options && typeof options.prefix === "string") data.prefix = options.prefix;
	else if (typeof data.prefix !== "string" || !data.prefix) throw new Error("Invalid prefix");
	if (options && typeof options.provider === "string") data.provider = options.provider;
	else if (data.provider !== void 0) {
		const value = data.provider;
		if (typeof value !== "string") if (fix) delete data.provider;
		else throw new Error("Invalid provider");
	}
	if (data.aliases !== void 0) {
		if (typeof data.aliases !== "object" || data.aliases === null) if (fix) delete data.aliases;
		else throw new Error("Invalid aliases list");
	}
	const tree = getIconsTree(data);
	const icons = data.icons;
	const aliases = data.aliases || Object.create(null);
	for (const name in tree) {
		const treeItem = tree[name];
		const isAlias = !icons[name];
		const parentObj = isAlias ? aliases : icons;
		if (!treeItem) {
			if (fix) {
				delete parentObj[name];
				continue;
			}
			throw new Error(`Invalid alias: ${name}`);
		}
		if (!name) {
			if (fix) {
				delete parentObj[name];
				continue;
			}
			throw new Error(`Invalid icon name: "${name}"`);
		}
		const item = parentObj[name];
		if (!isAlias) {
			if (typeof item.body !== "string") {
				if (fix) {
					delete parentObj[name];
					continue;
				}
				throw new Error(`Invalid icon: "${name}"`);
			}
		}
		const requiredProp = isAlias ? "parent" : "body";
		const key = typeof item[requiredProp] !== "string" ? requiredProp : validateIconProps(item, fix, true);
		if (key !== null) throw new Error(`Invalid property "${key}" in "${name}"`);
	}
	if (data.not_found !== void 0 && !(data.not_found instanceof Array)) if (fix) delete data.not_found;
	else throw new Error("Invalid not_found list");
	if (!Object.keys(data.icons).length && !(data.not_found && data.not_found.length)) throw new Error("Icon set is empty");
	if (fix && !Object.keys(aliases).length) delete data.aliases;
	const failedOptionalProp = validateIconProps(data, false, false);
	if (failedOptionalProp) throw new Error(`Invalid value type for "${failedOptionalProp}"`);
	if (data.chars !== void 0) {
		if (typeof data.chars !== "object" || data.chars === null) if (fix) delete data.chars;
		else throw new Error("Invalid characters map");
	}
	if (typeof data.chars === "object") {
		const chars = data.chars;
		Object.keys(chars).forEach((char) => {
			if (!matchChar.exec(char) || typeof chars[char] !== "string") {
				if (fix) {
					delete chars[char];
					return;
				}
				throw new Error(`Invalid character "${char}"`);
			}
			const target = chars[char];
			if (!data.icons[target] && (!data.aliases || !data.aliases[target])) {
				if (fix) {
					delete chars[char];
					return;
				}
				throw new Error(`Character "${char}" points to missing icon "${target}"`);
			}
		});
		if (fix && !Object.keys(data.chars).length) delete data.chars;
	}
	return data;
}

export { matchChar, validateIconSet };