// Filtering functionality

// Apply all filters
function applyFilters() {
    // Start with files from selected transmittal folders AND selected grouping folders
    let filtered = window.app.files.filter(file => {
        // Must have at least one grouping folder selected (if grouping folders exist)
        if (window.app.groupingFolders.length > 0 && window.app.selectedGroupingFolders.size === 0) {
            return false;
        }
        
        // Must have at least one transmittal folder selected
        if (window.app.selectedTransmittalFolders.size === 0) {
            return false;
        }
        
        // File must be in a selected transmittal folder
        if (!window.app.selectedTransmittalFolders.has(file.folderPath)) {
            return false;
        }
        
        // Outstanding files: actualPath must be under a selected grouping folder that is
        // itself visible (not hidden by folder type toggles).
        if (file.folderPath === '__outstanding__') {
            if (!window.app.modules.app.outstandingFileIsVisible(file)) return false;
        }
        
        // If grouping folders exist and are selected, the file's transmittal folder must be within one.
        // Outstanding files are exempt — their grouping scope is enforced by the actualPath check above.
        if (file.folderPath !== '__outstanding__' && window.app.groupingFolders.length > 0 && window.app.selectedGroupingFolders.size > 0) {
            const inSelectedGrouping = Array.from(window.app.selectedGroupingFolders).some(groupingPath => 
                file.folderPath.startsWith(groupingPath + '/')
            );
            if (!inSelectedGrouping) {
                return false;
            }
        }
        
        return true;
    });
    

    
    // Apply column filters
    filtered = applyColumnFilters(filtered);
    
    // Apply modifier filter
    if (window.app.selectedModifiers.size < window.app.availableModifiers.size) {
        filtered = filtered.filter(file => window.app.modules.app.filePassesModifierFilter(file));
    }
    
    updateResetFiltersBtn();
    
    // Apply selected-only filter
    if (window.app.showSelectedOnly) {
        filtered = filtered.filter(file => window.app.selectedFiles.has(file.id));
    }
    
    window.app.filteredFiles = filtered;
    window.app.modules.table.updateFileTable();
    window.app.modules.app.updateStatusBar();
    window.app.modules.table.updateSelectAllVisibleCheckbox();
}



// Apply column filters using stored ASTs
function applyColumnFilters(files) {
    const asts = window.app.columnFilterASTs;
    
    if (asts.trackingNumber && asts.trackingNumber.length > 0) {
        files = files.filter(file =>
            zddc.filter.matches(file.trackingNumber || '', asts.trackingNumber)
        );
    }
    
    if (asts.title && asts.title.length > 0) {
        files = files.filter(file =>
            zddc.filter.matches(file.title || '', asts.title)
        );
    }
    
    if (asts.revisions && asts.revisions.length > 0) {
        files = files.filter(file => {
            const revisionText = [
                file.revision,
                file.status,
                file.extension
            ].join(' ');
            return zddc.filter.matches(revisionText, asts.revisions);
        });
    }
    
    return files;
}

// Clear all filters
function clearFilters() {
    window.app.columnFilters = {
        trackingNumber: '',
        title: '',
        revisions: ''
    };
    window.app.columnFilterASTs = {
        trackingNumber: null,
        title: null,
        revisions: null
    };
    window.app.groupingFilter = '';
    window.app.transmittalFilter = '';
    
    // Clear UI inputs
    const groupingFilterEl = document.getElementById('groupingFilter');
    groupingFilterEl.value = '';
    groupingFilterEl.classList.remove('filter-active');
    const transmittalFilterEl = document.getElementById('transmittalFilter');
    transmittalFilterEl.value = '';
    transmittalFilterEl.classList.remove('filter-active');
    document.querySelectorAll('.column-filter').forEach(input => {
        input.value = '';
        input.classList.remove('filter-active');
    });
    
    window.app.modules.app.toggleAllModifiers(true);
    updateResetFiltersBtn();
    applyFilters();
    window.app.modules.urlState.push();
}

// Update reset filters button visibility
function updateResetFiltersBtn() {
    // Button is always visible — no show/hide logic needed
}

// Register filtering module
window.app.modules.filtering = {
    applyFilters,
    applyColumnFilters,
    clearFilters,
    updateResetFiltersBtn
};