// Search and filtering functionality
(function() {
    'use strict';
    
    // State management
    let currentFilters = {
        search: '',
        domain: '',
        phase: '',
        mode: 'selector'
    };
    
    let allTools = [];
    let domains = [];
    let phases = [];
    
    // DOM elements
    let searchInput;
    let domainSelect;
    let phaseSelect;
    let resetButton;
    let resetEmptyButton;
    let toolResults;
    let toolsGrid;
    let defaultState;
    let noResults;
    let resultsTitle;
    let resultsCount;
    let resultsDescription;
    let viewModes;
    let modeButtons;
    
    // Initialize when DOM is loaded
    function init() {
        // Get data from global variables (set by template)
        if (typeof window.toolsData !== 'undefined') {
            allTools = window.toolsData;
            domains = window.domains || [];
            phases = window.phases || [];
        }
        
        // Get DOM elements
        searchInput = document.getElementById('search-input');
        domainSelect = document.getElementById('domain-select');
        phaseSelect = document.getElementById('phase-select');
        resetButton = document.getElementById('reset-filters');
        resetEmptyButton = document.getElementById('reset-filters-empty');
        toolResults = document.getElementById('tool-results');
        toolsGrid = document.getElementById('tools-grid');
        defaultState = document.getElementById('default-state');
        noResults = document.getElementById('no-results');
        resultsTitle = document.getElementById('results-title');
        resultsCount = document.getElementById('results-count');
        resultsDescription = document.getElementById('results-description');
        
        // View mode elements
        viewModes = {
            selector: document.getElementById('view-selector'),
            matrix: document.getElementById('view-matrix'),
            saas: document.getElementById('view-saas')
        };
        
        modeButtons = {
            selector: document.getElementById('mode-selector'),
            matrix: document.getElementById('mode-matrix'),
            saas: document.getElementById('mode-saas')
        };
        
        // Add event listeners
        if (searchInput) {
            searchInput.addEventListener('input', handleSearchChange);
        }
        
        if (domainSelect) {
            domainSelect.addEventListener('change', handleDomainChange);
        }
        
        if (phaseSelect) {
            phaseSelect.addEventListener('change', handlePhaseChange);
        }
        
        if (resetButton) {
            resetButton.addEventListener('click', resetFilters);
        }
        
        if (resetEmptyButton) {
            resetEmptyButton.addEventListener('click', resetFilters);
        }
        
        // Mode switching
        Object.keys(modeButtons).forEach(mode => {
            if (modeButtons[mode]) {
                modeButtons[mode].addEventListener('click', () => switchMode(mode));
            }
        });
        
        // Initialize views
        updateDisplay();
        populateMatrix();
        populateSaasGrid();
    }
    
    // Event handlers
    function handleSearchChange(event) {
        currentFilters.search = event.target.value;
        updateDisplay();
    }
    
    function handleDomainChange(event) {
        currentFilters.domain = event.target.value;
        updateDisplay();
    }
    
    function handlePhaseChange(event) {
        currentFilters.phase = event.target.value;
        updateDisplay();
    }
    
    function resetFilters() {
        currentFilters.search = '';
        currentFilters.domain = '';
        currentFilters.phase = '';
        
        if (searchInput) searchInput.value = '';
        if (domainSelect) domainSelect.value = '';
        if (phaseSelect) phaseSelect.value = '';
        
        updateDisplay();
    }
    
    function switchMode(mode) {
        currentFilters.mode = mode;
        
        // Update button states
        Object.keys(modeButtons).forEach(m => {
            if (modeButtons[m]) {
                modeButtons[m].classList.toggle('view-mode-active', m === mode);
                modeButtons[m].classList.toggle('view-mode-btn', m !== mode);
            }
        });
        
        // Update view visibility
        Object.keys(viewModes).forEach(m => {
            if (viewModes[m]) {
                viewModes[m].classList.toggle('hidden', m !== mode);
                viewModes[m].classList.toggle('view-mode-active', m === mode);
            }
        });
        
        // Update displays based on mode
        if (mode === 'matrix') {
            populateMatrix();
        } else if (mode === 'saas') {
            populateSaasGrid();
        } else {
            updateDisplay();
        }
    }
    
    // Filter tools based on current filters
    function filterTools() {
        let filtered = allTools;
        
        // Filter by type based on mode
        if (currentFilters.mode === 'saas') {
            filtered = filtered.filter(tool => tool.type === 'SaaS');
        } else if (currentFilters.mode === 'selector' || currentFilters.mode === 'matrix') {
            filtered = filtered.filter(tool => tool.type === 'FOSS');
        }
        
        // Apply search filter
        if (currentFilters.search) {
            const searchTerm = currentFilters.search.toLowerCase();
            filtered = filtered.filter(tool => 
                tool.name.toLowerCase().includes(searchTerm) ||
                tool.description.toLowerCase().includes(searchTerm) ||
                (tool.tags && tool.tags.some(tag => tag.toLowerCase().includes(searchTerm)))
            );
        }
        
        // Apply domain filter (only for selector mode)
        if (currentFilters.mode === 'selector' && currentFilters.domain) {
            filtered = filtered.filter(tool => 
                tool.domains && tool.domains.includes(currentFilters.domain)
            );
        }
        
        // Apply phase filter (only for selector mode)
        if (currentFilters.mode === 'selector' && currentFilters.phase) {
            filtered = filtered.filter(tool => 
                tool.phases && tool.phases.includes(currentFilters.phase)
            );
        }
        
        return filtered;
    }
    
    // Update the display based on current filters
    function updateDisplay() {
        if (currentFilters.mode !== 'selector') return;
        
        const hasFilters = currentFilters.search || currentFilters.domain || currentFilters.phase;
        
        if (!hasFilters) {
            // Show default state
            if (toolResults) toolResults.classList.add('hidden');
            if (defaultState) defaultState.classList.remove('hidden');
            return;
        }
        
        const filtered = filterTools();
        
        // Hide default state, show results
        if (defaultState) defaultState.classList.add('hidden');
        if (toolResults) toolResults.classList.remove('hidden');
        
        // Update results metadata
        if (resultsCount) resultsCount.textContent = filtered.length;
        updateResultsDescription();
        
        // Show/hide no results message
        if (filtered.length === 0) {
            if (toolsGrid) toolsGrid.classList.add('hidden');
            if (noResults) noResults.classList.remove('hidden');
        } else {
            if (noResults) noResults.classList.add('hidden');
            if (toolsGrid) toolsGrid.classList.remove('hidden');
            renderTools(filtered);
        }
    }
    
    // Update results description text
    function updateResultsDescription() {
        if (!resultsDescription) return;
        
        const parts = [];
        if (currentFilters.domain) parts.push(`Bereich: ${currentFilters.domain}`);
        if (currentFilters.phase) parts.push(`Phase: ${currentFilters.phase}`);
        if (currentFilters.search) parts.push(`Suche: "${currentFilters.search}"`);
        
        resultsDescription.textContent = parts.join(' • ');
    }
    
    // Render tools in the grid
    function renderTools(tools) {
        if (!toolsGrid) return;
        
        toolsGrid.innerHTML = tools.map(tool => createToolCard(tool)).join('');
        
        // Add click handlers for tool cards
        const toolCards = toolsGrid.querySelectorAll('.tool-card');
        toolCards.forEach((card, index) => {
            card.addEventListener('click', () => showToolModal(tools[index]));
        });
    }
    
    // Create HTML for a tool card
    function createToolCard(tool) {
        const typeLabel = tool.type === 'SaaS' ? 
            '<span class="tag tag-purple">SaaS</span>' : '';
        
        const tags = (tool.tags || []).slice(0, 3).map(tag => 
            `<span class="tag tag-blue">${tag}</span>`
        ).join('');
        
        const platforms = (tool.platforms || []).join(', ');
        
        return `
            <div class="tool-card" data-tool-id="${tool.id}">
                <div class="flex items-start justify-between mb-2">
                    <h3 class="font-semibold text-gray-900 dark:text-gray-100 text-lg">
                        ${tool.name}
                    </h3>
                    <div class="flex items-center gap-2">
                        ${typeLabel}
                        <svg class="w-4 h-4 text-gray-400 hover:text-blue-600 dark:text-gray-500 dark:hover:text-blue-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 6H6a2 2 0 00-2 2v10a2 2 0 002 2h10a2 2 0 002-2v-4M14 4h6m0 0v6m0-6L10 14"/>
                        </svg>
                    </div>
                </div>
                <p class="text-gray-600 dark:text-gray-300 text-sm mb-3">${tool.description}</p>
                <div class="flex flex-wrap gap-1 mb-2">
                    ${tags}
                </div>
                <div class="text-xs text-gray-500 dark:text-gray-400">
                    ${tool.skillLevel} • ${tool.accessType} • ${platforms}
                </div>
            </div>
        `;
    }
    
    // Populate matrix view
    function populateMatrix() {
        if (currentFilters.mode !== 'matrix') return;
        
        domains.forEach(domain => {
            phases.forEach(phase => {
                const cell = document.querySelector(`[data-domain="${domain}"][data-phase="${phase}"]`);
                if (!cell) return;
                
                const cellTools = allTools.filter(tool => 
                    tool.type === 'FOSS' &&
                    tool.domains && tool.domains.includes(domain) &&
                    tool.phases && tool.phases.includes(phase) &&
                    (!currentFilters.search || 
                     tool.name.toLowerCase().includes(currentFilters.search.toLowerCase()) ||
                     tool.description.toLowerCase().includes(currentFilters.search.toLowerCase()) ||
                     (tool.tags && tool.tags.some(tag => tag.toLowerCase().includes(currentFilters.search.toLowerCase()))))
                );
                
                if (cellTools.length === 0) {
                    cell.innerHTML = '<div class="text-gray-400 dark:text-gray-500 text-sm text-center py-2">-</div>';
                } else {
                    cell.innerHTML = cellTools.map(tool => 
                        `<div class="matrix-cell-tool" data-tool-id="${tool.id}">${tool.name}</div>`
                    ).join('');
                    
                    // Add click handlers
                    const toolElements = cell.querySelectorAll('.matrix-cell-tool');
                    toolElements.forEach((element, index) => {
                        element.addEventListener('click', () => showToolModal(cellTools[index]));
                    });
                }
            });
        });
    }
    
    // Populate SaaS grid
    function populateSaasGrid() {
        if (currentFilters.mode !== 'saas') return;
        
        const saasGrid = document.getElementById('saas-grid');
        const saasCount = document.getElementById('saas-count');
        const noSaasResults = document.getElementById('no-saas-results');
        
        if (!saasGrid) return;
        
        const saasTools = filterTools();
        
        if (saasCount) saasCount.textContent = saasTools.length;
        
        if (saasTools.length === 0) {
            saasGrid.classList.add('hidden');
            if (noSaasResults) noSaasResults.classList.remove('hidden');
        } else {
            if (noSaasResults) noSaasResults.classList.add('hidden');
            saasGrid.classList.remove('hidden');
            
            saasGrid.innerHTML = saasTools.map(tool => createToolCard(tool)).join('');
            
            // Add click handlers
            const toolCards = saasGrid.querySelectorAll('.tool-card');
            toolCards.forEach((card, index) => {
                card.addEventListener('click', () => showToolModal(saasTools[index]));
            });
        }
    }
    
    // Show tool modal (defined in modal.js)
    function showToolModal(tool) {
        if (typeof window.showToolModal === 'function') {
            window.showToolModal(tool);
        }
    }
    
    // Export for use by other scripts
    window.searchModule = {
        init,
        filterTools,
        updateDisplay,
        populateMatrix,
        populateSaasGrid,
        resetFilters
    };
    
    // Auto-initialize when DOM is ready
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }
})();