#!/bin/bash

################################################################################
# Intelligent Remediation Engine
################################################################################
# Purpose: Parse findings and generate intelligent, actionable recommendations
# Integrates with website-slowness-diagnostics.sh
################################################################################

# Color codes for remediation output
REMEDIATION_CRITICAL='\033[1;31m'  # Bold Red
REMEDIATION_WARNING='\033[1;33m'   # Bold Yellow
REMEDIATION_INFO='\033[1;36m'      # Bold Cyan
REMEDIATION_SUCCESS='\033[1;32m'   # Bold Green
REMEDIATION_NC='\033[0m'           # No Color

################################################################################
# REMEDIATION RECOMMENDATION GENERATION
################################################################################

# Generate remediation for a specific finding
generate_remediation() {
    local check_name="$1"
    local finding_value="$2"
    local finding_severity="$3"  # CRITICAL, WARNING, OK, INFO

    case "$check_name" in
        "wp_debug_enabled")
            if [[ "$finding_value" == "true" ]]; then
                echo -e "${REMEDIATION_CRITICAL}REMEDIATION: Disable WP_DEBUG in Production${REMEDIATION_NC}"
                echo "  Current: WP_DEBUG is enabled in wp-config.php"
                echo "  Impact: 10-15% performance penalty from error logging"
                echo ""
                echo "  Fix:"
                echo "    1. Edit /home/{user}/public_html/wp-config.php"
                echo "    2. Change:"
                echo "       define( 'WP_DEBUG', true );"
                echo "       define( 'WP_DEBUG_DISPLAY', true );"
                echo "    3. To:"
                echo "       define( 'WP_DEBUG', false );"
                echo "       define( 'WP_DEBUG_DISPLAY', false );"
                echo "       define( 'WP_DEBUG_LOG', false );"
                echo ""
                echo "    4. Delete debug.log if it exists:"
                echo "       rm /home/{user}/public_html/wp-content/debug.log"
                echo ""
                echo "  Expected Improvement: 10-15% faster page load"
            fi
            ;;

        "xdebug_enabled")
            if [[ "$finding_value" == "true" ]]; then
                echo -e "${REMEDIATION_CRITICAL}REMEDIATION: Xdebug Enabled in Production - CRITICAL${REMEDIATION_NC}"
                echo "  Current: Xdebug is loaded and active"
                echo "  Impact: 50-70% performance penalty"
                echo ""
                echo "  Fix (Choose one):"
                echo ""
                echo "  Option 1: Disable Xdebug"
                echo "    Find config: php -i | grep xdebug.ini"
                echo "    Edit and comment out: ;zend_extension=xdebug.so"
                echo "    Restart: systemctl restart php-fpm"
                echo ""
                echo "  Option 2: Uninstall Xdebug"
                echo "    pecl uninstall xdebug"
                echo "    systemctl restart php-fpm"
                echo ""
                echo "  Verify: php -m | grep xdebug (should be empty)"
                echo ""
                echo "  Expected Improvement: 50-70% faster PHP execution (MAJOR!)"
            fi
            ;;

        "xmlrpc_enabled")
            if [[ "$finding_value" == "true" ]]; then
                echo -e "${REMEDIATION_WARNING}REMEDIATION: Disable XML-RPC${REMEDIATION_NC}"
                echo "  Current: XML-RPC API is enabled"
                echo "  Impact: Security risk, unnecessary overhead"
                echo ""
                echo "  Fix (Choose one):"
                echo ""
                echo "  Option 1: Block via .htaccess (fastest)"
                echo "    Add to .htaccess:"
                echo "    <Files xmlrpc.php>"
                echo "        Order allow,deny"
                echo "        Deny from all"
                echo "    </Files>"
                echo ""
                echo "  Option 2: Disable via wp-config.php"
                echo "    add_filter( 'xmlrpc_enabled', '__return_false' );"
                echo ""
                echo "  Option 3: Install plugin"
                echo "    wp plugin install disable-xml-rpc --activate"
                echo ""
                echo "  Verify: curl https://example.com/xmlrpc.php (should be 403)"
            fi
            ;;

        "missing_critical_indexes")
            echo -e "${REMEDIATION_CRITICAL}REMEDIATION: Add Missing Database Indexes${REMEDIATION_NC}"
            echo "  Current: $finding_value"
            echo "  Impact: 50-80% faster database queries"
            echo ""
            echo "  Fix:"
            echo "    $finding_value"
            echo ""
            echo "  After adding indexes:"
            echo "    OPTIMIZE TABLE {table_name};"
            ;;

        "db_buffer_pool_small")
            echo -e "${REMEDIATION_CRITICAL}REMEDIATION: Increase InnoDB Buffer Pool${REMEDIATION_NC}"
            echo "  Current: $finding_value"
            echo "  Impact: 50-80% faster database queries (major!)"
            echo ""
            echo "  Fix:"
            echo "    1. Edit /etc/my.cnf"
            echo "    2. Find [mysqld] section"
            echo "    3. Set: innodb_buffer_pool_size = 8G (or 50-75% of available RAM)"
            echo ""
            echo "    4. Restart MySQL:"
            echo "       systemctl restart mysql"
            echo ""
            echo "    5. Verify:"
            echo "       mysql -e 'SELECT @@innodb_buffer_pool_size;'"
            echo ""
            echo "  Expected Improvement: 50-80% faster queries"
            ;;

        "php_memory_low")
            echo -e "${REMEDIATION_WARNING}REMEDIATION: Increase PHP Memory Limit${REMEDIATION_NC}"
            echo "  Current: $finding_value"
            echo "  Impact: Prevent memory exhaustion errors"
            echo ""
            echo "  Fix:"
            echo "    1. For WordPress: Recommended 256M minimum (512M if WooCommerce)"
            echo "    2. Edit /etc/php/8.0/fpm/php.ini"
            echo "    3. Set: memory_limit = 256M"
            echo ""
            echo "    4. Or edit wp-config.php:"
            echo "       define( 'WP_MEMORY_LIMIT', '256M' );"
            echo ""
            echo "    5. Restart: systemctl restart php-fpm"
            ;;

        "opcache_disabled")
            if [[ "$finding_value" == "true" ]]; then
                echo -e "${REMEDIATION_CRITICAL}REMEDIATION: Enable and Configure OPcache${REMEDIATION_NC}"
                echo "  Current: OPcache not enabled"
                echo "  Impact: 2-3x slower PHP execution"
                echo ""
                echo "  Fix:"
                echo "    1. Edit /etc/php/8.0/fpm/php.ini"
                echo "    2. Add or set:"
                echo ""
                echo "       [opcache]"
                echo "       opcache.enable = 1"
                echo "       opcache.memory_consumption = 256"
                echo "       opcache.interned_strings_buffer = 16"
                echo "       opcache.max_accelerated_files = 10000"
                echo "       opcache.max_wasted_percentage = 5"
                echo "       opcache.revalidate_freq = 0"
                echo "       opcache.save_comments = 1"
                echo "       opcache.validate_timestamps = 0 (production)"
                echo ""
                echo "    3. Restart: systemctl restart php-fpm"
                echo "    4. Verify: php -m | grep Zend\\ OPcache"
                echo ""
                echo "  Expected Improvement: 2-3x faster PHP"
            fi
            ;;

        "http2_disabled")
            echo -e "${REMEDIATION_WARNING}REMEDIATION: Enable HTTP/2${REMEDIATION_NC}"
            echo "  Current: HTTP/1.1 only"
            echo "  Impact: 15-30% faster asset loading"
            echo ""
            echo "  Fix:"
            echo "    1. Enable module: a2enmod http2"
            echo "    2. Edit /etc/apache2/sites-enabled/{domain}-le-ssl.conf"
            echo "    3. Add: Protocols h2 http/1.1"
            echo "    4. Restart: systemctl restart apache2"
            echo ""
            echo "    5. Verify:"
            echo "       curl -I --http2 https://example.com | grep HTTP"
            echo "       (Should show HTTP/2)"
            echo ""
            echo "  Expected Improvement: 15-30% faster asset delivery"
            ;;

        "autosave_too_frequent")
            echo -e "${REMEDIATION_WARNING}REMEDIATION: Reduce Autosave Frequency${REMEDIATION_NC}"
            echo "  Current: $finding_value"
            echo "  Impact: Constant database writes, reduces overhead"
            echo ""
            echo "  Fix:"
            echo "    1. Edit wp-config.php"
            echo "    2. Change from 60 seconds to 300 seconds (5 minutes):"
            echo "       define( 'AUTOSAVE_INTERVAL', 300 );"
            echo ""
            echo "    3. Also set revision limit:"
            echo "       define( 'WP_POST_REVISIONS', 10 );"
            echo ""
            echo "    4. Clean existing revisions:"
            echo "       wp post delete \$(wp post list --format=ids --post_type=revision) --force"
            echo ""
            echo "  Expected Improvement: 5-10% reduced database load"
            ;;

        "slow_query_log_threshold")
            echo -e "${REMEDIATION_INFO}REMEDIATION: Reduce Slow Query Log Threshold${REMEDIATION_NC}"
            echo "  Current: $finding_value seconds (too high)"
            echo "  Impact: Better detection of actual slow queries"
            echo ""
            echo "  Fix:"
            echo "    1. Edit /etc/my.cnf"
            echo "    2. Set: long_query_time = 1 (down from 10)"
            echo "    3. Restart: systemctl restart mysql"
            echo ""
            echo "    4. Analyze slow queries:"
            echo "       mysqldumpslow -s t -t 10 /var/log/mysql/slow-query.log"
            echo ""
            echo "  Expected Improvement: Identify actual bottlenecks"
            ;;

        *)
            echo -e "${REMEDIATION_INFO}Remediation for '$check_name': $finding_value${REMEDIATION_NC}"
            ;;
    esac
}

################################################################################
# BATCH REMEDIATION ANALYSIS
################################################################################

# Analyze all findings and generate remediation report
analyze_findings_for_remediation() {
    local temp_dir="$1"

    echo ""
    echo "================================================================================================"
    echo "                          INTELLIGENT REMEDIATION RECOMMENDATIONS                             "
    echo "================================================================================================"
    echo ""

    # Track remediation count
    local remediation_count=0

    # Check for critical issues
    echo -e "${REMEDIATION_CRITICAL}═══ CRITICAL ISSUES (Fix Immediately) ═══${REMEDIATION_NC}"
    echo ""

    # Check for Xdebug
    if grep -q "Xdebug" "$temp_dir"/*.tmp 2>/dev/null; then
        generate_remediation "xdebug_enabled" "true" "CRITICAL"
        remediation_count=$((remediation_count + 1))
        echo ""
    fi

    # Check for WP_DEBUG
    if grep -q "WP_DEBUG.*true\|DEBUG.*enabled" "$temp_dir"/*.tmp 2>/dev/null; then
        generate_remediation "wp_debug_enabled" "true" "CRITICAL"
        remediation_count=$((remediation_count + 1))
        echo ""
    fi

    # Check for backup files in docroot
    if grep -q "CRITICAL.*Backup files in docroot" "$temp_dir"/*.tmp 2>/dev/null; then
        echo -e "${REMEDIATION_CRITICAL}REMEDIATION: Remove Backup Files from Public Directory${REMEDIATION_NC}"
        echo "  These are blocking the site and wasting resources!"
        echo ""
        echo "  Command: rm -rf /home/{user}/public_html/backup-*.tar.gz"
        echo ""
        remediation_count=$((remediation_count + 1))
        echo ""
    fi

    echo -e "${REMEDIATION_WARNING}═══ HIGH-PRIORITY ISSUES (Fix Soon) ═══${REMEDIATION_NC}"
    echo ""

    # Check for XML-RPC
    if grep -q "XML-RPC\|xmlrpc" "$temp_dir"/*.tmp 2>/dev/null; then
        generate_remediation "xmlrpc_enabled" "true" "WARNING"
        remediation_count=$((remediation_count + 1))
        echo ""
    fi

    # Check for low PHP memory
    if grep -q "CRITICAL.*memory" "$temp_dir"/*.tmp 2>/dev/null; then
        generate_remediation "php_memory_low" "low" "WARNING"
        remediation_count=$((remediation_count + 1))
        echo ""
    fi

    # Check for low InnoDB buffer pool
    if grep -q "buffer.*pool\|innodb" "$temp_dir"/*.tmp 2>/dev/null; then
        generate_remediation "db_buffer_pool_small" "128M" "WARNING"
        remediation_count=$((remediation_count + 1))
        echo ""
    fi

    echo -e "${REMEDIATION_INFO}═══ OPTIMIZATION OPPORTUNITIES (Improve Performance) ═══${REMEDIATION_NC}"
    echo ""

    # Check for OPcache
    if grep -q "OPcache\|opcache" "$temp_dir"/*.tmp 2>/dev/null; then
        generate_remediation "opcache_disabled" "true" "INFO"
        remediation_count=$((remediation_count + 1))
        echo ""
    fi

    # Check for HTTP/2
    if grep -q "HTTP/1\|http.*1\.1" "$temp_dir"/*.tmp 2>/dev/null; then
        generate_remediation "http2_disabled" "true" "INFO"
        remediation_count=$((remediation_count + 1))
        echo ""
    fi

    if [ $remediation_count -eq 0 ]; then
        echo -e "${REMEDIATION_SUCCESS}✓ No critical issues detected!${REMEDIATION_NC}"
        echo ""
    fi

    echo "================================================================================================"
    echo "Remediation recommendations generated: $remediation_count"
    echo "================================================================================================"
    echo ""
}

################################################################################
# REMEDIATION SUMMARY
################################################################################

# Print summary of what user should do
print_remediation_summary() {
    local temp_dir="$1"

    cat << 'EOF'

NEXT STEPS FOR OPTIMIZATION:

1. IMMEDIATE (Today):
   □ Address any CRITICAL issues shown above
   □ Review findings in the full report above

2. THIS WEEK:
   □ Implement HIGH-PRIORITY optimizations
   □ Test each change and monitor impact

3. THIS MONTH:
   □ Implement OPTIMIZATION opportunities
   □ Monitor performance improvements
   □ Validate fixes are working

For detailed information about each check, see the full report above.

Need help implementing a fix? Each remediation includes exact commands to run.

EOF
}

################################################################################
# EXPORT FUNCTIONS
################################################################################

export -f generate_remediation
export -f analyze_findings_for_remediation
export -f print_remediation_summary