/**
 * @fileoverview URL Router Service for Rantii
 * @author retoor <retoor@molodetz.nl>
 * @description Handles URL routing and navigation state management
 * @keywords router, navigation, url, history, routing
 */

class Router {
    constructor() {
        this.routes = new Map();
        this.currentRoute = null;
        this.currentParams = {};
        this.onRouteChange = null;
        this.basePath = this.detectBasePath();
    }

    detectBasePath() {
        const path = window.location.pathname;
        const htmlIndex = path.lastIndexOf('.html');
        if (htmlIndex !== -1) {
            return path.substring(0, path.lastIndexOf('/') + 1);
        }
        return path.endsWith('/') ? path : path + '/';
    }

    init() {
        window.addEventListener('popstate', () => this.handleRoute());
        this.handleRoute();
    }

    register(name, handler) {
        this.routes.set(name, handler);
    }

    getParams() {
        const params = new URLSearchParams(window.location.search);
        const result = {};
        for (const [key, value] of params) {
            result[key] = value;
        }
        return result;
    }

    handleRoute() {
        const params = this.getParams();
        this.currentParams = params;

        let routeName = 'home';
        if (params.rant) {
            routeName = 'rant';
        } else if (params.user) {
            routeName = 'user';
        } else if (params.search !== undefined) {
            routeName = 'search';
        } else if (params.notifications !== undefined) {
            routeName = 'notifications';
        } else if (params.settings !== undefined) {
            routeName = 'settings';
        } else if (params.login !== undefined) {
            routeName = 'login';
        } else if (params.weekly !== undefined) {
            routeName = 'weekly';
        } else if (params.collabs !== undefined) {
            routeName = 'collabs';
        } else if (params.stories !== undefined) {
            routeName = 'stories';
        }

        this.currentRoute = routeName;
        const handler = this.routes.get(routeName);
        if (handler) {
            handler(params);
        }
        if (this.onRouteChange) {
            this.onRouteChange(routeName, params);
        }
        window.dispatchEvent(new CustomEvent('rantii:route-change', {
            detail: { route: routeName, params }
        }));
    }

    navigate(routeName, params = {}) {
        const url = this.buildUrl(params);
        window.history.pushState({ route: routeName, params }, '', url);
        this.handleRoute();
    }

    replace(routeName, params = {}) {
        const url = this.buildUrl(params);
        window.history.replaceState({ route: routeName, params }, '', url);
        this.handleRoute();
    }

    buildUrl(params = {}) {
        const searchParams = new URLSearchParams();
        Object.entries(params).forEach(([key, value]) => {
            if (value !== undefined && value !== null && value !== '') {
                searchParams.set(key, value);
            } else if (value === '') {
                searchParams.set(key, '');
            }
        });
        const queryString = searchParams.toString();
        const currentPath = window.location.pathname;
        return queryString ? `${currentPath}?${queryString}` : currentPath;
    }

    goHome() {
        this.navigate('home', {});
    }

    goToRant(rantId, commentId = null) {
        const params = { rant: rantId };
        if (commentId) {
            params.comment = commentId;
        }
        this.navigate('rant', params);
    }

    goToUser(username) {
        this.navigate('user', { user: username });
    }

    goToSearch(term = '') {
        this.navigate('search', { search: term });
    }

    goToNotifications() {
        this.navigate('notifications', { notifications: '' });
    }

    goToSettings() {
        this.navigate('settings', { settings: '' });
    }

    goToLogin() {
        this.navigate('login', { login: '' });
    }

    goToWeekly() {
        this.navigate('weekly', { weekly: '' });
    }

    goToCollabs() {
        this.navigate('collabs', { collabs: '' });
    }

    goToStories() {
        this.navigate('stories', { stories: '' });
    }

    back() {
        window.history.back();
    }

    forward() {
        window.history.forward();
    }

    getCurrentRoute() {
        return this.currentRoute;
    }

    getCurrentParams() {
        return this.currentParams;
    }

    setRouteChangeCallback(callback) {
        this.onRouteChange = callback;
    }

    isCurrentRoute(routeName) {
        return this.currentRoute === routeName;
    }
}

export { Router };