// ==UserScript==
// @name         Any Hackernews Link
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Check if current page has been posted to Hacker News
// @author       RoCry
// @match        *://*/*
// @grant        GM_xmlhttpRequest
// @connect      hn.algolia.com
// @grant        GM_addStyle
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    /**
     * Configuration
     */
    const CONFIG = {
        // HN API endpoint
        API_URL: 'https://hn.algolia.com/api/v1/search',
        
        // List of domains to ignore
        IGNORED_DOMAINS: [
            'news.ycombinator.com',
            'hn.algolia.com',
            'mail.google.com',
            'gmail.com',
            'outlook.com',
            'yahoo.com',
            'proton.me',
            'localhost',
            'accounts.google.com',
            'drive.google.com',
            'docs.google.com',
            'calendar.google.com',
            'meet.google.com',
            'chat.google.com',
            'web.whatsapp.com',
            'twitter.com/messages',
            'facebook.com/messages',
            'linkedin.com/messaging'
        ],

        // Patterns that indicate a search page
        SEARCH_PATTERNS: [
            '/search',
            '/webhp',
            '/results',
            '?q=',
            '?query=',
            '?search=',
            '?s='
        ],

        // URL parameters to remove during normalization
        TRACKING_PARAMS: [
            'utm_source',
            'utm_medium',
            'utm_campaign',
            'utm_term',
            'utm_content',
            'fbclid',
            'gclid',
            '_ga',
            'ref',
            'source'
        ]
    };

    /**
     * Styles
     */
    const STYLES = `
        @keyframes fadeIn {
            0% { opacity: 0; transform: translateY(10px); }
            100% { opacity: 1; transform: translateY(0); }
        }
        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.6; }
            100% { opacity: 1; }
        }
        #hn-float {
            position: fixed;
            bottom: 20px;
            left: 20px;
            z-index: 9999;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            display: flex;
            align-items: center;
            gap: 12px;
            background: rgba(255, 255, 255, 0.98);
            padding: 8px 12px;
            border-radius: 12px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.05);
            cursor: pointer;
            transition: all 0.2s ease;
            max-width: 50px;
            overflow: hidden;
            opacity: 0.95;
            height: 40px;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            animation: fadeIn 0.3s ease forwards;
            will-change: transform, max-width, box-shadow;
            color: #111827;
        }
        #hn-float:hover {
            max-width: 600px;
            opacity: 1;
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.05);
        }
        #hn-float .hn-icon {
            min-width: 24px;
            width: 24px;
            height: 24px;
            background: linear-gradient(135deg, #ff6600, #ff7f33);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            border-radius: 6px;
            flex-shrink: 0;
            position: relative;
            font-size: 13px;
            text-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
            transition: transform 0.2s ease;
        }
        #hn-float:hover .hn-icon {
            transform: scale(1.05);
        }
        #hn-float .hn-icon.not-found {
            background: #9ca3af;
        }
        #hn-float .hn-icon.found {
            background: linear-gradient(135deg, #ff6600, #ff7f33);
        }
        #hn-float .hn-icon.loading {
            background: #6b7280;
            animation: pulse 1.5s infinite;
        }
        #hn-float .hn-icon .badge {
            position: absolute;
            top: -6px;
            right: -6px;
            background: linear-gradient(135deg, #3b82f6, #2563eb);
            color: white;
            border-radius: 10px;
            min-width: 18px;
            height: 18px;
            font-size: 11px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 4px;
            font-weight: 600;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            border: 2px solid white;
        }
        #hn-float .hn-info {
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            line-height: 1.4;
            font-size: 13px;
            opacity: 0;
            transition: opacity 0.2s ease;
        }
        #hn-float:hover .hn-info {
            opacity: 1;
        }
        #hn-float .hn-info a {
            color: inherit;
            font-weight: 500;
            text-decoration: none;
        }
        #hn-float .hn-info a:hover {
            text-decoration: underline;
        }
        #hn-float .hn-stats {
            color: #6b7280;
            font-size: 12px;
            margin-top: 2px;
        }
        @media (prefers-color-scheme: dark) {
            #hn-float {
                background: rgba(17, 24, 39, 0.95);
                color: #e5e7eb;
                box-shadow: 0 2px 12px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.1);
            }
            #hn-float:hover {
                box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.1);
            }
            #hn-float .hn-stats {
                color: #9ca3af;
            }
            #hn-float .hn-icon .badge {
                border-color: rgba(17, 24, 39, 0.95);
            }
        }
    `;

    /**
     * URL Utilities
     */
    const URLUtils = {
        /**
         * Check if a URL should be ignored based on domain or search patterns
         * @param {string} url - URL to check
         * @returns {boolean} - True if URL should be ignored
         */
        shouldIgnoreUrl(url) {
            try {
                const urlObj = new URL(url);
                
                // Check ignored domains
                if (CONFIG.IGNORED_DOMAINS.some(domain => urlObj.hostname.includes(domain))) {
                    return true;
                }

                // Check if it's a search page
                if (CONFIG.SEARCH_PATTERNS.some(pattern => 
                    urlObj.pathname.includes(pattern) || urlObj.search.includes(pattern))) {
                    return true;
                }

                return false;
            } catch (e) {
                console.error('Error checking URL:', e);
                return false;
            }
        },

        /**
         * Normalize URL by removing tracking parameters and standardizing format
         * @param {string} url - URL to normalize
         * @returns {string} - Normalized URL
         */
        normalizeUrl(url) {
            try {
                const urlObj = new URL(url);
                
                // Remove tracking parameters
                CONFIG.TRACKING_PARAMS.forEach(param => urlObj.searchParams.delete(param));
                
                // Remove hash
                urlObj.hash = '';
                
                // Remove trailing slash for consistency
                let normalizedUrl = urlObj.toString();
                if (normalizedUrl.endsWith('/')) {
                    normalizedUrl = normalizedUrl.slice(0, -1);
                }
                
                return normalizedUrl;
            } catch (e) {
                console.error('Error normalizing URL:', e);
                return url;
            }
        },

        /**
         * Compare two URLs for equality after normalization
         * @param {string} url1 - First URL
         * @param {string} url2 - Second URL
         * @returns {boolean} - True if URLs match
         */
        urlsMatch(url1, url2) {
            try {
                const u1 = new URL(this.normalizeUrl(url1));
                const u2 = new URL(this.normalizeUrl(url2));
                
                return u1.hostname.toLowerCase() === u2.hostname.toLowerCase() &&
                       u1.pathname.toLowerCase() === u2.pathname.toLowerCase() &&
                       u1.search === u2.search;
            } catch (e) {
                console.error('Error comparing URLs:', e);
                return false;
            }
        }
    };

    /**
     * UI Component
     */
    const UI = {
        /**
         * Create and append the floating element to the page
         * @returns {HTMLElement} - The created element
         */
        createFloatingElement() {
            const div = document.createElement('div');
            div.id = 'hn-float';
            div.innerHTML = `
                <div class="hn-icon loading">Y</div>
                <div class="hn-info">Checking HN...</div>
            `;
            document.body.appendChild(div);
            return div;
        },

        /**
         * Update the floating element with HN data
         * @param {Object|null} data - HN post data or null if not found
         */
        updateFloatingElement(data) {
            const iconDiv = document.querySelector('#hn-float .hn-icon');
            const infoDiv = document.querySelector('#hn-float .hn-info');
            
            iconDiv.classList.remove('loading');
            
            if (!data) {
                iconDiv.classList.add('not-found');
                iconDiv.classList.remove('found');
                iconDiv.innerHTML = 'Y';
                infoDiv.textContent = 'Not found on HN';
                return;
            }
            
            iconDiv.classList.remove('not-found');
            iconDiv.classList.add('found');
            iconDiv.innerHTML = `Y${data.comments > 0 ? 
                `<span class="badge">${data.comments > 999 ? '999+' : data.comments}</span>` : ''}`;
            
            infoDiv.innerHTML = `
                <div><a href="${data.link}" target="_blank">${data.title}</a></div>
                <div class="hn-stats">
                    ${data.points} points | ${data.comments} comments | ${data.posted}
                </div>
            `;
        }
    };

    /**
     * HackerNews API Handler
     */
    const HNApi = {
        /**
         * Search for a URL on HackerNews
         * @param {string} normalizedUrl - URL to search for
         */
        checkHackerNews(normalizedUrl) {
            const apiUrl = `${CONFIG.API_URL}?query=${encodeURIComponent(normalizedUrl)}&restrictSearchableAttributes=url`;
            
            GM_xmlhttpRequest({
                method: 'GET',
                url: apiUrl,
                onload: (response) => this.handleApiResponse(response, normalizedUrl),
                onerror: (error) => {
                    console.error('Error fetching from HN API:', error);
                    UI.updateFloatingElement(null);
                }
            });
        },

        /**
         * Handle the API response
         * @param {Object} response - API response
         * @param {string} normalizedUrl - Original normalized URL
         */
        handleApiResponse(response, normalizedUrl) {
            try {
                const data = JSON.parse(response.responseText);
                const matchingHits = data.hits.filter(hit => URLUtils.urlsMatch(hit.url, normalizedUrl));
                
                if (matchingHits.length === 0) {
                    console.log('🔍 URL not found on Hacker News');
                    UI.updateFloatingElement(null);
                    return;
                }

                const topHit = matchingHits.sort((a, b) => (b.points || 0) - (a.points || 0))[0];
                const result = {
                    title: topHit.title,
                    points: topHit.points || 0,
                    comments: topHit.num_comments || 0,
                    link: `https://news.ycombinator.com/item?id=${topHit.objectID}`,
                    posted: new Date(topHit.created_at).toLocaleDateString()
                };

                console.log('📰 Found on Hacker News:', result);
                UI.updateFloatingElement(result);
            } catch (e) {
                console.error('Error parsing HN API response:', e);
                UI.updateFloatingElement(null);
            }
        }
    };

    /**
     * Initialize the script
     */
    function init() {
        const currentUrl = window.location.href;
        
        if (URLUtils.shouldIgnoreUrl(currentUrl)) {
            return;
        }

        GM_addStyle(STYLES);
        const normalizedUrl = URLUtils.normalizeUrl(currentUrl);
        console.log('🔗 Normalized URL:', normalizedUrl);
        
        UI.createFloatingElement();
        HNApi.checkHackerNews(normalizedUrl);
    }

    // Start the script
    init();
})();