/*!
 * V4Fire Core
 * https://github.com/V4Fire/Core
 *
 * Released under the MIT license
 * https://github.com/V4Fire/Core/blob/master/LICENSE
 */

import { createStyleCache } from 'core/log/config/styles';

import type { LogStylesConfig, StylesCache } from 'core/log/config';
import type { LogEvent } from 'core/log/middlewares';

import type { LogLevel } from 'core/log/interface';
import type { LogEngine } from 'core/log/engines/interface';

export class ConsoleEngine implements LogEngine {
	protected stylesCache?: StylesCache;
	protected stringifiedStylesCache: Dictionary<string> = Object.createDict();

	constructor(styles?: LogStylesConfig) {
		if (styles != null) {
			this.stylesCache = createStyleCache(styles);
		}
	}

	/**
	 * Prints the specified event to a console
	 * @param event - log event to print
	 */
	log(event: LogEvent): void {
		//#if runtime has core/log

		if (Object.size(event.additionals) === 0 && event.error == null) {
			console.log(`%c${event.context}`, this.getStringifiedStyle(event.level));

		} else {
			const
				details: unknown[] = [];

			if (Object.size(event.additionals) > 0) {
				details.push(event.additionals);
			}

			if (event.error != null) {
				details.push(event.error);
			}

			console.log(`%c${event.context}`, this.getStringifiedStyle(event.level), ...details);
		}

		//#endif
	}

	/**
	 * Returns a string representing of a style for the specified log level
	 * @param logLevel - level of logging that needs a style
	 */
	protected getStringifiedStyle(logLevel: LogLevel): string {
		//#if runtime has core/log

		if (!this.stylesCache) {
			return '';
		}

		const
			val = this.stringifiedStylesCache[logLevel];

		if (val !== undefined) {
			return val;
		}

		const
			style = this.stylesCache.getStyle(logLevel);

		if (!style) {
			return '';
		}

		let
			stringifiedStyle = '';

		for (let keys = Object.keys(style), i = 0; i < keys.length; i++) {
			const key = keys[i];
			stringifiedStyle += `${key.dasherize()}:${String(style[key])};`;
		}

		if (stringifiedStyle === '') {
			return '';
		}

		return this.stringifiedStylesCache[logLevel] = stringifiedStyle;

		//#endif
	}
}