import { Config, HostPort, UIConfig } from './types';
import type { I18nMap } from './types';
import { defaultConfig } from './config/defaults';

/**
 * Merge config from WordPress localized script data and data-* attributes.
 */
export function readConfig(root: Element): Config {
	// Read from WordPress localized script data
	const cfgScript = (window as any).webircChatConfig || {}; // eslint-disable-line @typescript-eslint/no-explicit-any

	const server =
		(cfgScript.server as string) ||
		root.getAttribute('data-server') ||
		defaultConfig.server;
	const channel =
		(cfgScript.channel as string) ||
		root.getAttribute('data-channel') ||
		defaultConfig.channel;

	let subprotocols: string[] = [];
	const subRaw = cfgScript.subprotocols as unknown;
	if (Array.isArray(subRaw)) {
		subprotocols = subRaw as string[];
	} else if (subRaw) {
		subprotocols = [String(subRaw)];
	}

	// Handle debugLogs properly - wp_localize_script converts booleans to strings
	// Also check data-attributes for consistency with allowRaw
	let debugLogs = false;
	const debugValue = cfgScript.debugLogs;
	if (
		debugValue === true ||
		debugValue === '1' ||
		debugValue === 1 ||
		debugValue === 'true' ||
		root.getAttribute('data-debug-logs') === '1' ||
		root.getAttribute('data-debug-logs') === 'true'
	) {
		debugLogs = true;
	}

	// Parse allowRaw flag – default false for security
	let allowRaw = false;
	const rawValue = cfgScript.allowRaw;
	if (
		rawValue === true ||
		rawValue === '1' ||
		rawValue === 1 ||
		rawValue === 'true' ||
		root.getAttribute('data-allow-raw') === '1' ||
		root.getAttribute('data-allow-raw') === 'true'
	) {
		allowRaw = true;
	}

	// Parse UI configuration with defaults
	const uiConfig: UIConfig = {
		defaultTheme:
			(cfgScript.ui?.defaultTheme as 'light' | 'dark') || 'light',
		allowThemeSwitch: cfgScript.ui?.allowThemeSwitch !== false,
		showDebugLog: cfgScript.ui?.showDebugLog === true,
		sidebarDefaultCollapsed: cfgScript.ui?.sidebarDefaultCollapsed === true,
	};

	// Parse user persistence configuration
	const userPersistence = cfgScript.userPersistence
		? {
				isLoggedIn: cfgScript.userPersistence.isLoggedIn === true,
				ajaxUrl: String(cfgScript.userPersistence.ajaxUrl || ''),
				nonce: String(cfgScript.userPersistence.nonce || ''),
				savedNickname: cfgScript.userPersistence.savedNickname
					? String(cfgScript.userPersistence.savedNickname)
					: undefined,
			}
		: undefined;

	return {
		server,
		channel,
		gatewayUrl: String(cfgScript.gatewayUrl || ''),
		wsPath:
			typeof cfgScript.wsPath === 'string'
				? cfgScript.wsPath
				: defaultConfig.wsPath,
		subprotocols:
			subprotocols.length > 0 ? subprotocols : defaultConfig.subprotocols,
		debugLogs,
		i18n: (cfgScript.i18n ?? defaultConfig.i18n) as I18nMap,
		allowRaw,
		ui: uiConfig,
		userPersistence,
	};
}

/**
 * Normalize host and port from server specification.
 */
export function normalizeHostPort(spec?: string | null): HostPort {
	if (!spec || typeof spec !== 'string') {
		return { host: 'irc.livefreeonline.club', port: 443 };
	}
	if (/^wss?:\/\//i.test(spec)) {
		try {
			const u = new URL(spec);
			const host = u.hostname;
			let port: number;
			if (u.port) {
				port = parseInt(u.port, 10);
			} else {
				port = u.protocol === 'wss:' ? 443 : 80;
			}
			return { host, port };
		} catch {
			return { host: 'irc.livefreeonline.club', port: 443 };
		}
	}
	const parts = spec.split(':');
	const host = (parts[0] || '').trim();
	const port = parts[1] ? parseInt(parts[1], 10) : 443;
	const validHost = /^[a-z0-9.\-]+$/i.test(host) ? host : '';
	return {
		host: validHost || 'irc.livefreeonline.club',
		port: Number.isFinite(port) ? port : 443,
	};
}

/**
 * Generate WebSocket URL from configuration.
 */
export function wsUrlFromConfig(cfg: Config, hostPort: HostPort): string {
	if (cfg.gatewayUrl) {
		try {
			const u = new URL(cfg.gatewayUrl);
			u.searchParams.set('server', hostPort.host);
			u.searchParams.set('port', String(hostPort.port));
			u.searchParams.set('secure', 'true');
			return u.toString();
		} catch {
			// ignore and fall through
		}
	}
	const path = String(cfg.wsPath || '').replace(/^\/+/, '');
	return `wss://${hostPort.host}:${hostPort.port}${path ? '/' + path : ''}`;
}