User:Polygnotus/Scripts/Filter2.js

// <nowiki>
// Wikipedia History and Contributions Filter
// Filters by namespace, tags, and edit summary with persistent state
// Add to Special:MyPage/common.js

(function() {
    'use strict';

    const CONFIG = {
        STORAGE_KEY: 'wikiFilterState',
        DEBOUNCE_TIME: 300,
        NAMESPACES: {
            '-2': 'Media',
            '-1': 'Special',
            '0': 'Main',
            '1': 'Talk',
            '2': 'User',
            '3': 'User talk',
            '4': 'Wikipedia',
            '5': 'Wikipedia talk',
            '6': 'File',
            '7': 'File talk',
            '8': 'MediaWiki',
            '9': 'MediaWiki talk',
            '10': 'Template',
            '11': 'Template talk',
            '12': 'Help',
            '13': 'Help talk',
            '14': 'Category',
            '15': 'Category talk',
            '100': 'Portal',
            '101': 'Portal talk',
            '108': 'Book',
            '109': 'Book talk',
            '118': 'Draft',
            '119': 'Draft talk',
            '710': 'TimedText',
            '711': 'TimedText talk',
            '828': 'Module',
            '829': 'Module talk',
            '2300': 'Gadget',
            '2301': 'Gadget talk',
            '2302': 'Gadget definition',
            '2303': 'Gadget definition talk'
        }
    };

    // Detect page type
    const isContribPage = document.querySelector('.mw-contributions-list') !== null;
    const isHistoryPage = document.querySelector('#pagehistory') !== null;
    
    if (!isContribPage && !isHistoryPage) return;

    let items = [];
    let namespaces = new Set();
    let tags = new Set();

    // Utility functions
    function debounce(func, wait) {
        let timeout;
        return function(...args) {
            clearTimeout(timeout);
            timeout = setTimeout(() => func.apply(this, args), wait);
        };
    }

    function loadState() {
        try {
            return JSON.parse(localStorage.getItem(CONFIG.STORAGE_KEY)) || {};
        } catch {
            return {};
        }
    }

    function saveState(state) {
        localStorage.setItem(CONFIG.STORAGE_KEY, JSON.stringify(state));
    }

    function getNamespace(title) {
        const colonIndex = title.indexOf(':');
        if (colonIndex === -1) return 'Main';
        
        const prefix = title.substring(0, colonIndex);
        
        // Check if it's a timestamp (hh:mm format)
        if (/^\d{1,2}:\d{2}$/.test(prefix)) return 'Main';
        
        // Check against known namespaces
        const knownNamespaces = new Set(Object.values(CONFIG.NAMESPACES));
        return knownNamespaces.has(prefix) ? prefix : 'Main';
    }

    function getItemData(item) {
        let title = '';
        let summary = '';
        let itemTags = [];

        if (isContribPage) {
            const titleElem = item.querySelector('.mw-contributions-title');
            title = titleElem ? titleElem.textContent.trim() : '';
            
            const summaryElem = item.querySelector('.comment');
            summary = summaryElem ? summaryElem.textContent.trim() : '';
            
            itemTags = Array.from(item.querySelectorAll('.mw-tag-marker'))
                .map(tag => tag.textContent.replace(/[[\]]/g, '').trim());
        } else {
            const link = item.querySelector('a.mw-changeslist-title');
            title = link ? link.textContent.trim() : '';
            
            const summaryElem = item.querySelector('.comment');
            summary = summaryElem ? summaryElem.textContent.trim() : '';
            
            itemTags = Array.from(item.querySelectorAll('.mw-tag-marker'))
                .map(tag => tag.textContent.replace(/[[\]]/g, '').trim());
        }

        const namespace = getNamespace(title);
        
        return { title, summary, tags: itemTags, namespace };
    }

    function initializeData() {
        const selector = isContribPage ? '.mw-contributions-list li' : '#pagehistory li';
        items = Array.from(document.querySelectorAll(selector));

        items.forEach(item => {
            const data = getItemData(item);
            namespaces.add(data.namespace);
            data.tags.forEach(tag => tags.add(tag));
            item._filterData = data;
        });
    }

    function addStyles() {
        const style = document.createElement('style');
        style.textContent = `
            .wiki-filter-container {
                margin: 1em 0;
                background: #f8f9fa;
                border: 1px solid #a2a9b1;
                border-radius: 2px;
            }
            .wiki-filter-section {
                border-bottom: 1px solid #e3e6e8;
            }
            .wiki-filter-section:last-child {
                border-bottom: none;
            }
            .wiki-filter-header {
                padding: 0.6em 0.8em;
                background: #eaecf0;
                cursor: pointer;
                user-select: none;
                display: flex;
                align-items: center;
                font-weight: 500;
            }
            .wiki-filter-header:hover {
                background: #e3e6e8;
            }
            .wiki-filter-toggle {
                margin-right: 0.5em;
                transition: transform 0.2s;
                display: inline-block;
            }
            .wiki-filter-enable {
                cursor: pointer;
                margin: 0;
            }
            .wiki-filter-content {
                padding: 0.8em;
            }
            .wiki-filter-checkboxes {
                display: flex;
                flex-wrap: wrap;
                gap: 0.8em;
                margin: 0.5em 0;
            }
            .wiki-filter-checkbox {
                white-space: nowrap;
            }
            .wiki-filter-checkbox input {
                margin-right: 0.3em;
            }
            .wiki-filter-buttons {
                display: flex;
                gap: 0.5em;
                margin-bottom: 0.8em;
            }
            .wiki-filter-btn {
                padding: 0.4em 0.8em;
                background: #fff;
                border: 1px solid #a2a9b1;
                border-radius: 2px;
                cursor: pointer;
                font-size: 0.9em;
            }
            .wiki-filter-btn:hover {
                background: #f8f9fa;
            }
            .wiki-filter-input {
                width: 100%;
                padding: 0.5em;
                border: 1px solid #a2a9b1;
                border-radius: 2px;
                font-size: 0.95em;
                box-sizing: border-box;
            }
            .wiki-filter-regex-option {
                margin-top: 0.5em;
                font-size: 0.9em;
            }
            .wiki-filter-regex-option input {
                margin-right: 0.3em;
            }
            .wiki-filter-stats {
                margin-top: 0.8em;
                padding: 0.5em;
                background: #fff;
                border: 1px solid #e3e6e8;
                border-radius: 2px;
                font-size: 0.9em;
                color: #54595d;
            }
        `;
        document.head.appendChild(style);
    }

    function createCollapsibleSection(title, key) {
        const state = loadState();
        const expanded = state[key] !== false; // Default to expanded

        const section = document.createElement('div');
        section.className = 'wiki-filter-section';

        const header = document.createElement('div');
        header.className = 'wiki-filter-header';

        const toggle = document.createElement('span');
        toggle.className = 'wiki-filter-toggle';
        toggle.textContent = '▼';

        const enableCheckbox = document.createElement('input');
        enableCheckbox.type = 'checkbox';
        enableCheckbox.className = 'wiki-filter-enable';
        enableCheckbox.checked = state[key + 'Enabled'] !== false;
        enableCheckbox.addEventListener('change', (e) => {
            e.stopPropagation();
            const currentState = loadState();
            currentState[key + 'Enabled'] = enableCheckbox.checked;
            saveState(currentState);
            applyFilters();
        });

        const heading = document.createElement('span');
        heading.textContent = title;
        heading.style.marginLeft = '0.5em';

        header.appendChild(toggle);
        header.appendChild(enableCheckbox);
        header.appendChild(heading);

        const content = document.createElement('div');
        content.className = 'wiki-filter-content';

        section.appendChild(header);
        section.appendChild(content);

        function setExpanded(exp) {
            toggle.style.transform = exp ? '' : 'rotate(-90deg)';
            content.style.display = exp ? '' : 'none';
        }

        header.addEventListener('click', (e) => {
            if (e.target === enableCheckbox) return;
            const newState = content.style.display === 'none';
            setExpanded(newState);
            const currentState = loadState();
            currentState[key] = newState;
            saveState(currentState);
        });

        setExpanded(expanded);
        return { section, content, enableCheckbox };
    }

    function createButtons(parent, checkboxSelector) {
        const container = document.createElement('div');
        container.className = 'wiki-filter-buttons';

        const selectAll = document.createElement('button');
        selectAll.type = 'button';
        selectAll.textContent = 'Select all';
        selectAll.className = 'wiki-filter-btn';
        selectAll.addEventListener('click', (e) => {
            e.preventDefault();
            parent.querySelectorAll(checkboxSelector).forEach(cb => cb.checked = true);
            applyFilters();
        });

        const selectNone = document.createElement('button');
        selectNone.type = 'button';
        selectNone.textContent = 'Select none';
        selectNone.className = 'wiki-filter-btn';
        selectNone.addEventListener('click', (e) => {
            e.preventDefault();
            parent.querySelectorAll(checkboxSelector).forEach(cb => cb.checked = false);
            applyFilters();
        });

        container.appendChild(selectAll);
        container.appendChild(selectNone);
        return container;
    }

    function createNamespaceSection() {
        const { section, content } = createCollapsibleSection('Filter by namespace', 'nsExpanded');
        const state = loadState();
        const saved = state.namespaces || [];

        const checkboxContainer = document.createElement('div');
        checkboxContainer.className = 'wiki-filter-checkboxes';

        const sortedNs = Array.from(namespaces).sort((a, b) => 
            a === 'Main' ? -1 : b === 'Main' ? 1 : a.localeCompare(b)
        );

        sortedNs.forEach(ns => {
            const label = document.createElement('label');
            label.className = 'wiki-filter-checkbox';

            const checkbox = document.createElement('input');
            checkbox.type = 'checkbox';
            checkbox.value = ns;
            checkbox.checked = saved.length === 0 || saved.includes(ns);
            checkbox.addEventListener('change', () => {
                saveFiltersState();
                applyFilters();
            });

            label.appendChild(checkbox);
            label.appendChild(document.createTextNode(ns));
            checkboxContainer.appendChild(label);
        });

        const buttons = createButtons(checkboxContainer, 'input[type="checkbox"]');
        content.appendChild(buttons);
        content.appendChild(checkboxContainer);

        return section;
    }

    function createTagSection() {
        if (tags.size === 0) return null;

        const { section, content } = createCollapsibleSection('Filter by tags', 'tagsExpanded');
        const state = loadState();
        const saved = state.tags || [];

        const checkboxContainer = document.createElement('div');
        checkboxContainer.className = 'wiki-filter-checkboxes';

        // Add "None" option
        const noneLabel = document.createElement('label');
        noneLabel.className = 'wiki-filter-checkbox';
        const noneCheckbox = document.createElement('input');
        noneCheckbox.type = 'checkbox';
        noneCheckbox.value = 'none';
        noneCheckbox.checked = saved.length === 0 || saved.includes('none');
        noneCheckbox.addEventListener('change', () => {
            saveFiltersState();
            applyFilters();
        });
        noneLabel.appendChild(noneCheckbox);
        noneLabel.appendChild(document.createTextNode('None (untagged)'));
        checkboxContainer.appendChild(noneLabel);

        // Add tag options
        Array.from(tags).sort().forEach(tag => {
            const label = document.createElement('label');
            label.className = 'wiki-filter-checkbox';

            const checkbox = document.createElement('input');
            checkbox.type = 'checkbox';
            checkbox.value = tag;
            checkbox.checked = saved.length === 0 || saved.includes(tag);
            checkbox.addEventListener('change', () => {
                saveFiltersState();
                applyFilters();
            });

            label.appendChild(checkbox);
            label.appendChild(document.createTextNode(tag));
            checkboxContainer.appendChild(label);
        });

        const buttons = createButtons(checkboxContainer, 'input[type="checkbox"]');
        content.appendChild(buttons);
        content.appendChild(checkboxContainer);

        return section;
    }

    function createSummarySection() {
        const { section, content } = createCollapsibleSection('Filter by edit summary', 'summaryExpanded');
        const state = loadState();

        const input = document.createElement('input');
        input.type = 'text';
        input.className = 'wiki-filter-input';
        input.placeholder = 'Enter text or regular expression...';
        input.value = state.summaryFilter || '';

        const debouncedFilter = debounce(() => {
            saveFiltersState();
            applyFilters();
        }, CONFIG.DEBOUNCE_TIME);

        input.addEventListener('input', debouncedFilter);

        const regexOption = document.createElement('div');
        regexOption.className = 'wiki-filter-regex-option';

        const regexCheckbox = document.createElement('input');
        regexCheckbox.type = 'checkbox';
        regexCheckbox.id = 'summary-regex';
        regexCheckbox.checked = state.useRegex || false;
        regexCheckbox.addEventListener('change', () => {
            saveFiltersState();
            applyFilters();
        });

        const regexLabel = document.createElement('label');
        regexLabel.htmlFor = 'summary-regex';
        regexLabel.appendChild(regexCheckbox);
        regexLabel.appendChild(document.createTextNode('Use regular expression (case-insensitive)'));

        regexOption.appendChild(regexLabel);

        content.appendChild(input);
        content.appendChild(regexOption);

        return section;
    }

    function createUI() {
        const container = document.createElement('div');
        container.className = 'wiki-filter-container';

        const nsSection = createNamespaceSection();
        container.appendChild(nsSection);

        const tagSection = createTagSection();
        if (tagSection) {
            container.appendChild(tagSection);
        }

        const summarySection = createSummarySection();
        container.appendChild(summarySection);

        const stats = document.createElement('div');
        stats.className = 'wiki-filter-stats';
        stats.id = 'filter-stats';
        container.appendChild(stats);

        const targetList = isContribPage 
            ? document.querySelector('.mw-contributions-list')
            : document.querySelector('#pagehistory');

        if (targetList) {
            targetList.parentNode.insertBefore(container, targetList);
        }
    }

    function saveFiltersState() {
        const state = loadState();

        // Save namespace selections
        const nsCheckboxes = document.querySelectorAll('.wiki-filter-section:first-child .wiki-filter-checkbox input');
        state.namespaces = Array.from(nsCheckboxes).filter(cb => cb.checked).map(cb => cb.value);

        // Save tag selections
        if (tags.size > 0) {
            const tagCheckboxes = document.querySelectorAll('.wiki-filter-section:nth-child(2) .wiki-filter-checkbox input');
            state.tags = Array.from(tagCheckboxes).filter(cb => cb.checked).map(cb => cb.value);
        }

        // Save summary filter
        const summaryInput = document.querySelector('.wiki-filter-input');
        const regexCheckbox = document.getElementById('summary-regex');
        if (summaryInput) {
            state.summaryFilter = summaryInput.value;
            state.useRegex = regexCheckbox.checked;
        }

        saveState(state);
    }

    function matchesSummary(summary, filter, useRegex) {
        if (!filter) return true;

        try {
            if (useRegex) {
                const regex = new RegExp(filter, 'i');
                return regex.test(summary);
            } else {
                return summary.toLowerCase().includes(filter.toLowerCase());
            }
        } catch {
            return false;
        }
    }

    function applyFilters() {
        const state = loadState();
        const nsEnabled = state.nsExpandedEnabled !== false;
        const tagsEnabled = state.tagsExpandedEnabled !== false;
        const summaryEnabled = state.summaryExpandedEnabled !== false;
        
        const selectedNs = state.namespaces || [];
        const selectedTags = state.tags || [];
        const summaryFilter = state.summaryFilter || '';
        const useRegex = state.useRegex || false;

        let visibleCount = 0;

        items.forEach(item => {
            const data = item._filterData;
            let show = true;

            // Namespace filter - only apply if enabled
            if (nsEnabled && selectedNs.length > 0) {
                if (!selectedNs.includes(data.namespace)) {
                    show = false;
                }
            }

            // Tag filter - only apply if enabled
            if (show && tagsEnabled && tags.size > 0 && selectedTags.length > 0) {
                if (data.tags.length === 0) {
                    if (!selectedTags.includes('none')) {
                        show = false;
                    }
                } else {
                    if (!data.tags.some(tag => selectedTags.includes(tag))) {
                        show = false;
                    }
                }
            }

            // Summary filter - only apply if enabled
            if (show && summaryEnabled && summaryFilter) {
                if (!matchesSummary(data.summary, summaryFilter, useRegex)) {
                    show = false;
                }
            }

            item.style.display = show ? '' : 'none';
            if (show) visibleCount++;
        });

        updateStats(visibleCount);
    }

    function updateStats(visible) {
        const stats = document.getElementById('filter-stats');
        if (stats) {
            stats.textContent = `Showing ${visible} of ${items.length} items`;
        }
    }

    function init() {
        addStyles();
        initializeData();
        createUI();
        applyFilters();
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }
})();
// </nowiki>

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