// Archived from: packages/core/src/api/modules/axios.ts
import axios from 'axios';
import { RedundancyPendingItem } from '@cyberalien/redundancy';
import {
	APIQueryParams,
	IconifyAPIPrepareQuery,
	IconifyAPISendQuery,
	IconifyAPIModule,
	GetIconifyAPIModule,
} from '../modules';
import { GetAPIConfig } from '../config';

/**
 * Endpoint
 */
const endPoint = '{prefix}.json?icons={icons}';

/**
 * Cache
 */
const maxLengthCache: Record<string, number> = Object.create(null);
const pathCache: Record<string, string> = Object.create(null);

/**
 * Return API module
 */
export const getAPIModule: GetIconifyAPIModule = (
	getAPIConfig: GetAPIConfig
): IconifyAPIModule => {
	/**
	 * Calculate maximum icons list length for prefix
	 */
	function calculateMaxLength(provider: string, prefix: string): number {
		// Get config and store path
		const config = getAPIConfig(provider);
		if (!config) {
			return 0;
		}

		// Calculate
		let result;
		if (!config.maxURL) {
			result = 0;
		} else {
			let maxHostLength = 0;
			config.resources.forEach((host) => {
				maxHostLength = Math.max(maxHostLength, host.length);
			});

			// Get available length
			result =
				config.maxURL -
				maxHostLength -
				config.path.length -
				endPoint
					.replace('{provider}', provider)
					.replace('{prefix}', prefix)
					.replace('{icons}', '').length;
		}

		// Cache stuff and return result
		const cacheKey = provider + ':' + prefix;
		pathCache[cacheKey] = config.path;
		maxLengthCache[cacheKey] = result;
		return result;
	}

	/**
	 * Prepare params
	 */
	const prepare: IconifyAPIPrepareQuery = (
		provider: string,
		prefix: string,
		icons: string[]
	): APIQueryParams[] => {
		const results: APIQueryParams[] = [];

		// Get maximum icons list length
		let maxLength = maxLengthCache[prefix];
		if (maxLength === void 0) {
			maxLength = calculateMaxLength(provider, prefix);
		}

		// Split icons
		let item: APIQueryParams = {
			provider,
			prefix,
			icons: [],
		};
		let length = 0;
		icons.forEach((name, index) => {
			length += name.length + 1;
			if (length >= maxLength && index > 0) {
				// Next set
				results.push(item);
				item = {
					provider,
					prefix,
					icons: [],
				};
				length = name.length;
			}

			item.icons.push(name);
		});
		results.push(item);

		return results;
	};

	/**
	 * Load icons
	 */
	const send: IconifyAPISendQuery = (
		host: string,
		params: APIQueryParams,
		status: RedundancyPendingItem
	): void => {
		const provider = params.provider;
		const prefix = params.prefix;
		const icons = params.icons;
		const iconsList = icons.join(',');

		const cacheKey = provider + ':' + prefix;
		const path =
			pathCache[cacheKey] +
			endPoint
				.replace('{provider}', provider)
				.replace('{prefix}', prefix)
				.replace('{icons}', iconsList);

		// console.log('API query:', host + path);
		const instance = axios.create({
			baseURL: host,
		});
		instance
			.get(path)
			.then((response) => {
				if (response.status !== 200) {
					return;
				}

				// Copy data. No need to parse it, axios parses JSON data
				const data = response.data;
				if (typeof data !== 'object' || data === null) {
					return;
				}

				// Store cache and complete
				status.done(data);
			})
			.catch(() => {
				// Do nothing
			});
	};

	// Return functions
	return {
		prepare,
		send,
	};
};