#!/bin/bash
# PHP-FPM Server Manager Module
# Orchestrates large-scale server operations: scanning, planning, executing, reporting
# Part of PHP Optimizer - Phase 3 Refactoring

# ============================================================================
# SERVER SCANNING & INVENTORY
# ============================================================================

# Scan entire server and collect comprehensive information
scan_entire_server() {
    local filter_mode="${1:-all}"  # all, user, pattern, traffic, needs_optimization
    local filter_arg="${2:-}"

    init_change_tracking

    local -a domains_to_analyze

    case "$filter_mode" in
        all)
            mapfile -t domains_to_analyze < <(enumerate_all_domains)
            ;;
        user)
            [ -z "$filter_arg" ] && return 1
            mapfile -t domains_to_analyze < <(enumerate_user_domains "$filter_arg")
            ;;
        pattern)
            [ -z "$filter_arg" ] && return 1
            mapfile -t domains_to_analyze < <(filter_domains_by_name "$filter_arg")
            ;;
        traffic)
            [ -z "$filter_arg" ] && filter_arg="100"
            mapfile -t domains_to_analyze < <(filter_domains_by_traffic "$filter_arg" "above")
            ;;
        needs_optimization)
            mapfile -t domains_to_analyze < <(filter_domains_by_optimization_status "needs_optimization")
            ;;
        *)
            return 1
            ;;
    esac

    local total_domains=${#domains_to_analyze[@]}
    local current=0
    local -A scan_results

    if [ "$total_domains" -eq 0 ]; then
        return 0
    fi

    for domain in "${domains_to_analyze[@]}"; do
        [ -z "$domain" ] && continue

        current=$((current + 1))
        show_enumeration_progress "$current" "$total_domains"

        # Collect domain info
        local owner
        owner=$(find_domain_owner "$domain")

        local issues
        issues=$(detect_php_config_issues "$owner" "$domain" 2>/dev/null || echo "")

        local issue_count
        issue_count=$(echo "$issues" | grep -c "^" || echo "0")

        scan_results["$domain"]="$owner|$issue_count|$issues"
    done

    echo ""

    # Output results in scannable format
    for domain in "${!scan_results[@]}"; do
        echo "DOMAIN|$domain|${scan_results[$domain]}"
    done

    return 0
}

# Analyze entire server for optimization opportunities
analyze_entire_server() {
    local -a all_domains

    mapfile -t all_domains < <(enumerate_all_domains)

    local total_domains=${#all_domains[@]}
    local domains_with_issues=0
    local critical_count=0
    local high_count=0
    local medium_count=0
    local low_count=0

    local current=0

    for domain in "${all_domains[@]}"; do
        [ -z "$domain" ] && continue

        current=$((current + 1))
        display_progress "$current" "$total_domains" "Analyzing"

        local owner
        owner=$(find_domain_owner "$domain")

        if [ -z "$owner" ]; then
            continue
        fi

        # Detect issues
        local issues
        issues=$(detect_php_config_issues "$owner" "$domain" 2>/dev/null)

        # Count issues by severity
        local c_count h_count m_count l_count
        c_count=$(echo "$issues" | grep -c "^[^|]*|CRITICAL|" || echo "0")
        h_count=$(echo "$issues" | grep -c "^[^|]*|HIGH|" || echo "0")
        m_count=$(echo "$issues" | grep -c "^[^|]*|MEDIUM|" || echo "0")
        l_count=$(echo "$issues" | grep -c "^[^|]*|LOW|" || echo "0")

        if [ $((c_count + h_count + m_count + l_count)) -gt 0 ]; then
            domains_with_issues=$((domains_with_issues + 1))
            critical_count=$((critical_count + c_count))
            high_count=$((high_count + h_count))
            medium_count=$((medium_count + m_count))
            low_count=$((low_count + l_count))
        fi
    done

    echo ""
    echo "$total_domains|$domains_with_issues|$critical_count|$high_count|$medium_count|$low_count"
}

# ============================================================================
# OPTIMIZATION PLANNING
# ============================================================================

# Plan optimizations for entire server
plan_server_optimizations() {
    local filter_mode="${1:-needs_optimization}"
    local filter_arg="${2:-}"
    local dry_run="${3:-true}"

    local -a domains_to_optimize
    mapfile -t domains_to_optimize < <(scan_entire_server "$filter_mode" "$filter_arg")

    local total_domains=0
    local optimization_count=0

    # Parse scan results and identify optimization opportunities
    declare -A optimization_plan

    while IFS='|' read -r type domain owner issue_count rest; do
        [ "$type" != "DOMAIN" ] && continue
        [ -z "$domain" ] && continue

        total_domains=$((total_domains + 1))

        if [ "$issue_count" -gt 0 ]; then
            optimization_count=$((optimization_count + 1))
            optimization_plan["$domain"]="$owner|$issue_count"
        fi
    done <<< "$(echo "${domains_to_optimize[@]}" | tr ' ' '\n')"

    # Generate plan summary
    echo "OPTIMIZATION_PLAN"
    echo "Total domains: $total_domains"
    echo "Domains needing optimization: $optimization_count"
    echo ""

    # List domains to be optimized
    for domain in "${!optimization_plan[@]}"; do
        local owner issue_count
        owner=$(echo "${optimization_plan[$domain]}" | cut -d'|' -f1)
        issue_count=$(echo "${optimization_plan[$domain]}" | cut -d'|' -f2)
        echo "  - $domain (owner: $owner, $issue_count issues)"
    done

    return 0
}

# ============================================================================
# OPTIMIZATION EXECUTION
# ============================================================================

# Execute planned optimizations across server
execute_server_optimization_plan() {
    local -a domains=("$@")
    local dry_run="${DRY_RUN:-false}"
    local require_confirmation="${REQUIRE_CONFIRMATION:-true}"

    if [ ${#domains[@]} -eq 0 ]; then
        return 1
    fi

    # Show summary before executing
    local total=${#domains[@]}
    echo ""
    echo "Server Optimization Summary:"
    echo "  Total domains to optimize: $total"
    echo "  Dry-run mode: $dry_run"
    echo ""

    if [ "$require_confirmation" = "true" ]; then
        if ! confirm "Execute optimizations for $total domain(s)?"; then
            return 1
        fi
    fi

    init_change_tracking

    local successful=0
    local failed=0
    local current=0

    for domain in "${domains[@]}"; do
        [ -z "$domain" ] && continue

        current=$((current + 1))
        display_progress "$current" "$total" "Optimizing"

        local owner
        owner=$(find_domain_owner "$domain")

        if [ -z "$owner" ]; then
            failed=$((failed + 1))
            log_change "$domain" "server_optimization" "unknown_owner" "skipped" "failed"
            continue
        fi

        # Apply optimizations
        if apply_optimization "$domain" "$owner" "all" "$dry_run"; then
            successful=$((successful + 1))
        else
            failed=$((failed + 1))
        fi
    done

    echo ""
    echo "Optimization Results:"
    echo "  Successful: $successful"
    echo "  Failed: $failed"
    echo "  Total: $((successful + failed))"

    # Reload PHP-FPM once for all changes
    if [ "$dry_run" != "true" ] && [ "$successful" -gt 0 ]; then
        echo "Reloading PHP-FPM to apply changes..."
        reload_php_fpm
    fi

    return $((failed > 0 ? 1 : 0))
}

# ============================================================================
# REPORTING
# ============================================================================

# Generate comprehensive server analysis report
generate_server_report() {
    local report_file="${1:-/tmp/php-optimizer-server-report-$(date +%Y%m%d-%H%M%S).txt}"
    local filter_mode="${2:-all}"
    local filter_arg="${3:-}"

    {
        echo "╔════════════════════════════════════════════════════════════════════════╗"
        echo "║           PHP-FPM SERVER ANALYSIS REPORT                              ║"
        echo "╚════════════════════════════════════════════════════════════════════════╝"
        echo ""
        echo "Generated: $(date)"
        echo ""

        # Server Information
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo "SERVER INFORMATION"
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo ""
        echo "Total RAM: $(free -h | awk '/^Mem:/ {print $2}')"
        echo "CPU Cores: $(nproc)"
        echo "Total Accounts: $(get_total_account_count)"
        echo "Total Domains: $(get_total_domain_count)"
        echo ""

        # Analysis Results
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo "ANALYSIS RESULTS"
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo ""

        local analysis_result
        analysis_result=$(analyze_entire_server)

        local total_domains domains_with_issues critical high medium low
        total_domains=$(echo "$analysis_result" | cut -d'|' -f1)
        domains_with_issues=$(echo "$analysis_result" | cut -d'|' -f2)
        critical=$(echo "$analysis_result" | cut -d'|' -f3)
        high=$(echo "$analysis_result" | cut -d'|' -f4)
        medium=$(echo "$analysis_result" | cut -d'|' -f5)
        low=$(echo "$analysis_result" | cut -d'|' -f6)

        echo "Total Domains Analyzed: $total_domains"
        echo "Domains with Issues: $domains_with_issues"
        echo ""
        echo "Issue Summary:"
        echo "  CRITICAL: $critical"
        echo "  HIGH: $high"
        echo "  MEDIUM: $medium"
        echo "  LOW: $low"
        echo ""

        # Health Status
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo "SERVER HEALTH STATUS"
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo ""

        local capacity_result
        capacity_result=$(calculate_server_memory_capacity 2>/dev/null)

        local total_required_mb total_ram_mb percentage status
        total_required_mb=$(echo "$capacity_result" | head -1 | cut -d'|' -f1)
        total_ram_mb=$(echo "$capacity_result" | head -1 | cut -d'|' -f2)
        percentage=$(echo "$capacity_result" | head -1 | cut -d'|' -f3)
        status=$(echo "$capacity_result" | head -1 | cut -d'|' -f4)

        echo "Total Server RAM: ${total_ram_mb}MB"
        echo "Current FPM Capacity: ${total_required_mb}MB (${percentage}% of RAM)"
        echo "Server Status: $status"
        echo ""

        # Recommendations
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo "RECOMMENDATIONS"
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo ""

        if [ "$domains_with_issues" -gt 0 ]; then
            echo "1. Apply recommended optimizations to $domains_with_issues domain(s)"
            if [ "$critical" -gt 0 ]; then
                echo "   - URGENT: Address $critical CRITICAL issue(s)"
            fi
            if [ "$high" -gt 0 ]; then
                echo "   - HIGH PRIORITY: Address $high HIGH severity issue(s)"
            fi
        else
            echo "No issues detected - server configuration is optimal"
        fi

        case "$status" in
            CRITICAL)
                echo "2. URGENT: Review memory allocation - server at OOM risk!"
                ;;
            WARNING)
                echo "2. Review memory allocation - consider reducing max_children"
                ;;
            CAUTION)
                echo "2. Monitor memory usage - consider minor adjustments"
                ;;
            HEALTHY)
                echo "2. Continue monitoring - no immediate action needed"
                ;;
        esac

        echo ""

        # Change History (if available)
        if [ -n "$EXECUTOR_CHANGE_LOG" ] && [ -f "$EXECUTOR_CHANGE_LOG" ]; then
            echo "═══════════════════════════════════════════════════════════════════════════"
            echo "RECENT CHANGES"
            echo "═══════════════════════════════════════════════════════════════════════════"
            echo ""
            tail -20 "$EXECUTOR_CHANGE_LOG"
            echo ""
        fi

        # Footer
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo "Report generated by PHP-FPM Optimizer - Phase 3"
        echo "═══════════════════════════════════════════════════════════════════════════"

    } | tee "$report_file"

    echo ""
    echo "Report saved to: $report_file"
}

# Generate domain-specific report
generate_domain_report() {
    local domain="$1"
    local report_file="${2:-/tmp/php-optimizer-${domain}-report-$(date +%Y%m%d-%H%M%S).txt}"

    local owner
    owner=$(find_domain_owner "$domain")

    if [ -z "$owner" ]; then
        return 1
    fi

    {
        echo "╔════════════════════════════════════════════════════════════════════════╗"
        echo "║           PHP-FPM DOMAIN ANALYSIS REPORT                              ║"
        echo "╚════════════════════════════════════════════════════════════════════════╝"
        echo ""
        echo "Domain: $domain"
        echo "Owner: $owner"
        echo "Generated: $(date)"
        echo ""

        # Domain Information
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo "DOMAIN INFORMATION"
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo ""

        local pool_config
        pool_config=$(find_fpm_pool_config "$owner" "$domain" 2>/dev/null)

        if [ -n "$pool_config" ]; then
            echo "Pool Config: $pool_config"
            echo ""
            echo "Current Settings:"
            grep "^pm" "$pool_config" | sed 's/^/  /'
            echo ""
        fi

        # Analysis
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo "ANALYSIS"
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo ""

        local issues
        issues=$(detect_php_config_issues "$owner" "$domain" 2>/dev/null)

        if [ -z "$issues" ] || [ "$(echo "$issues" | wc -l)" -eq 0 ]; then
            echo "No issues detected - configuration is optimal"
        else
            echo "Issues Found:"
            echo ""
            while IFS='|' read -r issue_type severity message recommendation; do
                [ -z "$issue_type" ] && continue
                echo "[$severity] $message"
                echo "  → $recommendation"
                echo ""
            done <<< "$issues"
        fi

        # Recommendations
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo "RECOMMENDATIONS"
        echo "═══════════════════════════════════════════════════════════════════════════"
        echo ""

        local total_ram_mb
        total_ram_mb=$(free -m | awk '/^Mem:/ {print $2}')

        local improved_result
        improved_result=$(calculate_optimal_php_settings "$owner" "$total_ram_mb" 2>/dev/null)

        if [ -n "$improved_result" ]; then
            local improved_max_children improved_pm_mode improved_reason
            improved_max_children=$(echo "$improved_result" | cut -d'|' -f1)
            improved_pm_mode=$(echo "$improved_result" | cut -d'|' -f2)
            improved_reason=$(echo "$improved_result" | cut -d'|' -f5)

            echo "Recommended pm.max_children: $improved_max_children"
            echo "Recommended pm mode: $improved_pm_mode"
            echo "Reason: $improved_reason"
        fi

        echo ""

    } | tee "$report_file"

    echo "Report saved to: $report_file"
}

# ============================================================================
# BATCH OPERATIONS
# ============================================================================

# Perform batch operation on multiple domains
batch_operation() {
    local operation="$1"  # optimize, analyze, health_check
    local filter_mode="${2:-needs_optimization}"
    local filter_arg="${3:-}"
    local require_confirmation="${4:-true}"

    local -a target_domains
    mapfile -t target_domains < <(scan_entire_server "$filter_mode" "$filter_arg")

    case "$operation" in
        optimize)
            echo "Planning server-wide optimization..."
            plan_server_optimizations "$filter_mode" "$filter_arg"

            if [ "$require_confirmation" = "true" ]; then
                if ! confirm "Execute optimizations?"; then
                    return 1
                fi
            fi

            execute_server_optimization_plan "${target_domains[@]}"
            ;;
        analyze)
            echo "Analyzing entire server..."
            analyze_entire_server
            ;;
        health_check)
            echo "Performing health check on all domains..."
            init_change_tracking

            local total=${#target_domains[@]}
            local current=0

            for domain in "${target_domains[@]}"; do
                [ -z "$domain" ] && continue

                current=$((current + 1))
                display_progress "$current" "$total"

                local owner
                owner=$(find_domain_owner "$domain")
                [ -n "$owner" ] && perform_health_check "$owner" "$domain" >/dev/null 2>&1
            done

            echo ""
            ;;
    esac

    return $?
}

# ============================================================================
# EXPORT ALL FUNCTIONS
# ============================================================================

export -f scan_entire_server
export -f analyze_entire_server
export -f plan_server_optimizations
export -f execute_server_optimization_plan
export -f generate_server_report
export -f generate_domain_report
export -f batch_operation