Implement batch operations to select and optimize multiple domains at once

- Add batch operation option to Option 4
- Allow user to select single domain or multiple domains
- Display optimization status [NEEDS OPTIMIZATION] or [OK] for each domain
- Support 'all' selection or individual number selection
- Optimizes selected domains in sequence
- Shows progress and summary of batch operation
- Includes simplified per-domain optimization for batch mode
- Provides fallback if recommendations can't be calculated

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

modules/performance/php-optimizer.sh

@@ -309,6 +309,37 @@ quick_health_check() {
 optimize_domain() {
     show_banner
 
+    cecho "${WHITE}${BOLD}DOMAIN OPTIMIZATION${NC}"
+    echo ""
+    cecho "  ${GREEN}s${NC}) Optimize single domain"
+    cecho "  ${GREEN}m${NC}) Optimize multiple domains (batch)"
+    cecho "  ${RED}q${NC}) Cancel"
+    echo ""
+    cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
+
+    read -p "Select option: " batch_choice
+
+    case "${batch_choice,,}" in
+        s)
+            optimize_single_domain_wrapper
+            ;;
+        m)
+            optimize_multiple_domains_wrapper
+            ;;
+        q)
+            return
+            ;;
+        *)
+            cecho "${RED}Invalid selection${NC}"
+            read -p "Press Enter to continue..."
+            return
+            ;;
+    esac
+}
+
+optimize_single_domain_wrapper() {
+    show_banner
+
     local selection
     selection=$(select_domain "optimize")
 
@@ -770,6 +801,207 @@ optimize_domain() {
     read -p "Press Enter to continue..."
 }
 
+optimize_multiple_domains_wrapper() {
+    show_banner
+    cecho "${WHITE}${BOLD}SELECT DOMAINS TO OPTIMIZE${NC}"
+    echo ""
+    cecho "${YELLOW}Batch operation: Optimize multiple domains in sequence${NC}"
+    echo ""
+
+    # Get all users with domains
+    local users
+    users=$(list_all_users)
+
+    if [ -z "$users" ]; then
+        cecho "${RED}ERROR: No users found on system${NC}"
+        read -p "Press Enter to continue..."
+        return
+    fi
+
+    # Build domain list with optimization status
+    declare -a domains
+    declare -A domain_to_user
+
+    while IFS= read -r username; do
+        local user_domains
+        user_domains=$(get_user_domains "$username")
+
+        while IFS= read -r domain; do
+            [ -z "$domain" ] && continue
+            domains+=("$domain")
+            domain_to_user["$domain"]="$username"
+        done <<< "$user_domains"
+    done <<< "$users"
+
+    if [ ${#domains[@]} -eq 0 ]; then
+        cecho "${RED}ERROR: No domains found on system${NC}"
+        read -p "Press Enter to continue..."
+        return
+    fi
+
+    # Display numbered list with optimization status
+    cecho "${CYAN}Available domains (select ones to optimize):${NC}"
+    echo ""
+
+    local index=1
+    for domain in "${domains[@]}"; do
+        local username="${domain_to_user[$domain]}"
+        local issues
+        issues=$(detect_php_config_issues "$username" "$domain" 2>/dev/null || echo "NONE|NONE|None")
+        local has_high_issues
+        has_high_issues=$(echo "$issues" | grep -cE "^[^|]*\|(CRITICAL|HIGH)\|" 2>/dev/null || echo "0")
+
+        local status_indicator=""
+        if [ "$has_high_issues" -gt 0 ]; then
+            status_indicator="${YELLOW}[NEEDS OPTIMIZATION]${NC}"
+        else
+            status_indicator="${GREEN}[OK]${NC}"
+        fi
+
+        printf "  ${GREEN}%-3d${NC}) %-40s ${CYAN}[${username}]${NC} %s\n" "$index" "$domain" "$(echo -e "$status_indicator")"
+        index=$((index + 1))
+    done
+
+    echo ""
+    cecho "${CYAN}Enter numbers separated by spaces (e.g., '1 3 5') or 'all' for all domains, 'none' to cancel${NC}"
+    cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
+    read -p "Selection: " user_selection
+
+    # Parse selection
+    user_selection=$(echo "$user_selection" | tr '[:upper:]' '[:lower:]')
+
+    declare -a selected_domains
+
+    if [[ "$user_selection" == "all" ]]; then
+        selected_domains=("${domains[@]}")
+    elif [[ "$user_selection" =~ ^(none|n)$ ]]; then
+        return
+    else
+        # Parse individual numbers
+        for num in $user_selection; do
+            if [[ "$num" =~ ^[0-9]+$ ]] && [ "$num" -ge 1 ] && [ "$num" -le ${#domains[@]} ]; then
+                selected_domains+=("${domains[$((num - 1))]}")
+            fi
+        done
+    fi
+
+    if [ ${#selected_domains[@]} -eq 0 ]; then
+        cecho "${YELLOW}No domains selected${NC}"
+        read -p "Press Enter to continue..."
+        return
+    fi
+
+    # Confirm
+    echo ""
+    cecho "${CYAN}Selected ${#selected_domains[@]} domain(s) for optimization${NC}"
+    if ! confirm "Continue?"; then
+        return
+    fi
+
+    # Optimize each selected domain
+    show_banner
+    cecho "${WHITE}${BOLD}BATCH OPTIMIZATION IN PROGRESS${NC}"
+    echo ""
+
+    local optimized=0
+    local failed=0
+
+    for domain in "${selected_domains[@]}"; do
+        local username="${domain_to_user[$domain]}"
+
+        cecho "${CYAN}Optimizing: ${WHITE}$domain${NC} ${CYAN}[$username]${NC}"
+
+        # Run single domain optimization (simplified)
+        optimize_domain_direct "$domain" "$username"
+        local result=$?
+
+        if [ $result -eq 0 ]; then
+            optimized=$((optimized + 1))
+        else
+            failed=$((failed + 1))
+        fi
+
+        echo ""
+    done
+
+    # Display summary
+    cecho "${CYAN}═══════════════════════════════════════════════════════════════════${NC}"
+    cecho "${WHITE}${BOLD}BATCH OPTIMIZATION COMPLETE${NC}"
+    cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
+    cecho "  Successfully optimized: ${GREEN}$optimized${NC}"
+    if [ "$failed" -gt 0 ]; then
+        cecho "  Failed: ${RED}$failed${NC}"
+    fi
+    cecho "${CYAN}═══════════════════════════════════════════════════════════════════${NC}"
+    echo ""
+    read -p "Press Enter to continue..."
+}
+
+optimize_domain_direct() {
+    local domain="$1"
+    local username="$2"
+
+    # Detect issues
+    local issues
+    issues=$(detect_php_config_issues "$username" "$domain" 2>/dev/null || echo "")
+
+    # Check if there are issues
+    local critical_high_count
+    critical_high_count=$(echo "$issues" | grep -cE "^[^|]*\|(CRITICAL|HIGH)\|" 2>/dev/null || echo "0")
+
+    if [ "$critical_high_count" -eq 0 ]; then
+        cecho "  ${GREEN}✓ No optimization needed${NC}"
+        return 0
+    fi
+
+    # Get pool config
+    local pool_config
+    pool_config=$(find_fpm_pool_config "$username" "$domain" 2>/dev/null)
+
+    if [ -z "$pool_config" ] || [ ! -f "$pool_config" ]; then
+        cecho "  ${YELLOW}⊘ No pool config found - skipping${NC}"
+        return 1
+    fi
+
+    # Get recommendations
+    local total_ram_mb
+    total_ram_mb=$(free -m | awk '/^Mem:/ {print $2}')
+
+    local improved_result
+    improved_result=$(calculate_optimal_php_settings "$username" "$total_ram_mb" 2>/dev/null || echo "")
+
+    if [ -z "$improved_result" ]; then
+        cecho "  ${YELLOW}⊘ Could not calculate recommendations - skipping${NC}"
+        return 1
+    fi
+
+    local improved_max=$(get_field "$improved_result" 1)
+    local current_max=$(grep "^pm.max_children" "$pool_config" 2>/dev/null | awk -F'=' '{print $2}' | tr -d ' ')
+
+    if [ -z "$current_max" ] || [ -z "$improved_max" ] || [ "$current_max" = "$improved_max" ]; then
+        cecho "  ${GREEN}✓ Already optimized${NC}"
+        return 0
+    fi
+
+    # Create backup
+    local backup_dir
+    backup_dir=$(backup_user_php_configs "$username" "$domain" 2>&1)
+
+    if [ $? -ne 0 ]; then
+        cecho "  ${RED}✗ Backup failed - skipping${NC}"
+        return 1
+    fi
+
+    # Apply optimization
+    if modify_fpm_pool_setting "$pool_config" "pm.max_children" "$improved_max" >/dev/null 2>&1; then
+        cecho "  ${GREEN}✓ Updated max_children: $current_max → $improved_max${NC}"
+        return 0
+    else
+        cecho "  ${RED}✗ Optimization failed${NC}"
+        return 1
+    fi
+}
+
 # ============================================================================
 # OPTIMIZE ALL DOMAINS (SERVER-WIDE)
 # ============================================================================