/*
This file is part of web3.js.

web3.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

web3.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
*/

import { Filter } from '@theqrl/web3-types';
import { isAddressString } from './address.js';
import { isBlockNumberOrTag } from './block.js';
import { isNullish } from './object.js';
import { isTopic } from './topic.js';

/**
 * First we check if all properties in the provided value are expected,
 * then because all Filter properties are optional, we check if the expected properties
 * are defined. If defined and they're not the expected type, we immediately return false,
 * otherwise we return true after all checks pass.
 */
export const isFilterObject = (value: Filter) => {
	const expectedFilterProperties: (keyof Filter)[] = [
		'fromBlock',
		'toBlock',
		'address',
		'topics',
		'blockHash',
	];
	if (isNullish(value) || typeof value !== 'object') return false;

	if (
		!Object.keys(value).every(property =>
			expectedFilterProperties.includes(property as keyof Filter),
		)
	)
		return false;

	if (
		(!isNullish(value.fromBlock) && !isBlockNumberOrTag(value.fromBlock)) ||
		(!isNullish(value.toBlock) && !isBlockNumberOrTag(value.toBlock))
	)
		return false;

	if (!isNullish(value.address)) {
		if (Array.isArray(value.address)) {
			if (!value.address.every(address => isAddressString(address))) return false;
		} else if (!isAddressString(value.address)) return false;
	}

	if (!isNullish(value.topics)) {
		if (
			!value.topics.every(topic => {
				if (isNullish(topic)) return true;

				if (Array.isArray(topic)) {
					return topic.every(nestedTopic => isTopic(nestedTopic));
				}

				if (isTopic(topic)) return true;

				return false;
			})
		)
			return false;
	}

	return true;
};