legion-server 0.1.0

//! Advanced Legion channel management and administration
//! 
//! Provides comprehensive channel administration, role management, and moderation
//! capabilities for Legion Protocol encrypted channels.

use crate::legion::{LegionError, LegionResult};
use legion_protocol::{AdminOperation, MemberOperation, BanOperation, KeyOperation, MemberRole, 
                     ChannelMode, ChannelSettings, AdminResult, ChannelAdmin, Permission};
use phalanx_crypto::{Identity, PublicKey};
use std::collections::{HashMap, HashSet};
use std::time::{SystemTime, Duration};
use tokio::sync::RwLock;
use serde::{Serialize, Deserialize};
use tracing::{debug, info, warn, error};

/// Advanced channel manager with full administration capabilities
pub struct AdvancedChannelManager {
    /// Channel configurations and settings
    channels: RwLock<HashMap<String, ManagedChannel>>,
    /// Global server settings for channels
    server_settings: ServerChannelSettings,
    /// Channel operation history for auditing
    operation_history: RwLock<Vec<ChannelOperation>>,
    /// Active channel administrators
    administrators: RwLock<HashMap<String, Vec<String>>>, // channel -> admin_user_ids
    /// Scheduled operations (key rotations, ban expiries, etc.)
    scheduled_operations: RwLock<Vec<ScheduledOperation>>,
}

/// A managed Legion channel with full administrative capabilities
#[derive(Debug, Clone)]
struct ManagedChannel {
    /// Channel basic information
    info: ChannelInfo,
    /// Channel settings and configuration
    settings: ChannelSettings,
    /// Current channel members with roles
    members: HashMap<String, ChannelMember>,
    /// Active bans and restrictions
    bans: Vec<ChannelBan>,
    /// Channel operation statistics
    stats: ChannelStats,
    /// Channel encryption keys management
    key_info: KeyInfo,
    /// Message rate limiting state
    rate_limits: HashMap<String, RateState>,
    /// Channel activity log
    activity_log: Vec<ActivityEntry>,
}

/// Server-wide channel settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ServerChannelSettings {
    /// Maximum channels per user
    pub max_channels_per_user: usize,
    /// Maximum members per channel
    pub max_members_per_channel: usize,
    /// Default key rotation interval
    pub default_key_rotation_interval: Duration,
    /// Message history retention period
    pub default_history_retention: Duration,
    /// Maximum ban list size per channel
    pub max_bans_per_channel: usize,
    /// Enable channel statistics collection
    pub enable_statistics: bool,
    /// Require registration for channel creation
    pub require_registration: bool,
}

/// Channel operation record for auditing
#[derive(Debug, Clone, Serialize, Deserialize)]
struct ChannelOperation {
    /// Operation timestamp
    timestamp: SystemTime,
    /// Channel name
    channel: String,
    /// User performing the operation
    operator: String,
    /// Operation performed
    operation: AdminOperation,
    /// Operation result
    result: AdminResult,
    /// Additional context
    context: Option<String>,
}

/// Scheduled operation for background processing
#[derive(Debug, Clone, Serialize, Deserialize)]
struct ScheduledOperation {
    /// When to execute the operation
    scheduled_time: SystemTime,
    /// Channel to operate on
    channel: String,
    /// Operation to perform
    operation: AdminOperation,
    /// Operation priority
    priority: Priority,
    /// Whether this is a recurring operation
    recurring: Option<Duration>,
}

/// Operation priority for scheduling
#[derive(Debug, Clone, Serialize, Deserialize, PartialOrd, Ord, PartialEq, Eq)]
enum Priority {
    Low,
    Normal,
    High,
    Critical,
}

/// Individual rate limiting state for a user
#[derive(Debug, Clone)]
struct RateState {
    /// Message count in current window
    message_count: u32,
    /// Current window start time
    window_start: SystemTime,
    /// Burst allowance remaining
    burst_remaining: u32,
}

/// Channel activity log entry
#[derive(Debug, Clone, Serialize, Deserialize)]
struct ActivityEntry {
    /// Activity timestamp
    timestamp: SystemTime,
    /// Activity type
    activity_type: ActivityType,
    /// User involved
    user_id: String,
    /// Additional details
    details: Option<String>,
}

/// Types of channel activities to log
#[derive(Debug, Clone, Serialize, Deserialize)]
enum ActivityType {
    /// User joined channel
    Join,
    /// User left channel
    Leave,
    /// Message sent
    Message,
    /// Topic changed
    TopicChange,
    /// Mode changed
    ModeChange,
    /// Member kicked
    Kick,
    /// Member banned
    Ban,
    /// Key rotation performed
    KeyRotation,
    /// Administrative action
    AdminAction,
}

/// Extended channel information with admin details
#[derive(Debug, Clone, Serialize)]
pub struct ExtendedChannelInfo {
    /// Basic channel information
    pub basic: ChannelInfo,
    /// Current administrators
    pub administrators: Vec<String>,
    /// Recent activity summary
    pub recent_activity: Vec<ActivityEntry>,
    /// Channel health metrics
    pub health_metrics: ChannelHealth,
    /// Security status
    pub security_status: SecurityStatus,
}

/// Channel health metrics
#[derive(Debug, Clone, Serialize)]
pub struct ChannelHealth {
    /// Overall health score (0-100)
    pub health_score: u8,
    /// Active issues
    pub issues: Vec<HealthIssue>,
    /// Performance metrics
    pub performance: PerformanceMetrics,
}

/// Channel health issues
#[derive(Debug, Clone, Serialize)]
pub enum HealthIssue {
    /// High message rate
    HighMessageRate,
    /// Many banned users
    ExcessiveBans,
    /// Key rotation overdue
    OverdueKeyRotation,
    /// Large member count
    HighMemberCount,
    /// Inactive administrators
    InactiveAdministrators,
}

/// Performance metrics for channel
#[derive(Debug, Clone, Serialize)]
pub struct PerformanceMetrics {
    /// Average message processing time
    pub avg_message_time: Duration,
    /// Messages per second
    pub messages_per_second: f64,
    /// Encryption operations per second
    pub encryption_ops_per_second: f64,
    /// Memory usage in bytes
    pub memory_usage: u64,
}

/// Channel security status
#[derive(Debug, Clone, Serialize)]
pub struct SecurityStatus {
    /// Encryption status
    pub encryption_active: bool,
    /// Key rotation status
    pub key_rotation_current: bool,
    /// Member verification status
    pub all_members_verified: bool,
    /// Recent security events
    pub recent_security_events: Vec<SecurityEvent>,
}

/// Security events that require attention
#[derive(Debug, Clone, Serialize)]
pub enum SecurityEvent {
    /// Failed decryption attempt
    DecryptionFailure { user_id: String, timestamp: SystemTime },
    /// Suspicious activity detected
    SuspiciousActivity { description: String, timestamp: SystemTime },
    /// Unauthorized access attempt
    UnauthorizedAccess { user_id: String, timestamp: SystemTime },
    /// Key rotation failure
    KeyRotationFailure { reason: String, timestamp: SystemTime },
}

impl Default for ServerChannelSettings {
    fn default() -> Self {
        Self {
            max_channels_per_user: 20,
            max_members_per_channel: 100,
            default_key_rotation_interval: Duration::from_secs(86400), // 24 hours
            default_history_retention: Duration::from_secs(2592000), // 30 days
            max_bans_per_channel: 50,
            enable_statistics: true,
            require_registration: false,
        }
    }
}

impl AdvancedChannelManager {
    /// Create a new advanced channel manager
    pub async fn new(server_settings: ServerChannelSettings) -> LegionResult<Self> {
        Ok(Self {
            channels: RwLock::new(HashMap::new()),
            server_settings,
            operation_history: RwLock::new(Vec::new()),
            administrators: RwLock::new(HashMap::new()),
            scheduled_operations: RwLock::new(Vec::new()),
        })
    }
    
    /// Execute an administrative operation on a channel
    pub async fn execute_admin_operation(
        &self,
        channel_name: &str,
        operation: AdminOperation,
        operator_id: &str,
        operator_identity: &Identity,
    ) -> LegionResult<AdminResult> {
        let start_time = SystemTime::now();
        
        // Check if operator has permission to perform this operation
        let operator_role = self.get_user_role(channel_name, operator_id).await?;
        let operator_permissions = self.get_user_permissions(channel_name, operator_id).await?;
        
        let admin = ChannelAdmin::new(
            operator_id.to_string(),
            operator_role,
            operator_permissions,
        );
        
        let channel_settings = self.get_channel_settings(channel_name).await?;
        
        if !admin.can_perform(&operation, &channel_settings) {
            let result = AdminResult {
                operation: operation.clone(),
                success: false,
                message: "Insufficient permissions".to_string(),
                data: None,
                timestamp: start_time,
            };
            
            self.log_operation(channel_name, operator_id, operation, result.clone()).await;
            return Ok(result);
        }
        
        // Execute the operation (clone to avoid moves)
        let result = match &operation {
            AdminOperation::CreateChannel { channel, settings } => {
                self.create_channel(channel, settings.clone(), operator_id).await
            },
            AdminOperation::SetTopic { channel, topic } => {
                self.set_channel_topic(channel, topic, operator_id).await
            },
            AdminOperation::SetMode { channel, mode, enabled } => {
                self.set_channel_mode(channel, mode.clone(), *enabled, operator_id).await
            },
            AdminOperation::MemberOperation { channel, target, operation: member_op } => {
                self.execute_member_operation(channel, target, member_op.clone(), operator_id).await
            },
            AdminOperation::BanOperation { channel, target, operation: ban_op, duration } => {
                self.execute_ban_operation(channel, target, ban_op.clone(), *duration, operator_id).await
            },
            AdminOperation::KeyOperation { channel, operation: key_op } => {
                self.execute_key_operation(channel, key_op.clone(), operator_identity).await
            },
        };
        
        let admin_result = result.unwrap_or_else(|e| AdminResult {
            operation: operation.clone(),
            success: false,
            message: format!("Operation failed: {}", e),
            data: None,
            timestamp: start_time,
        });
        
        // Log the operation (clone operation before moving)
        self.log_operation(channel_name, operator_id, operation.clone(), admin_result.clone()).await;
        
        // Update channel activity
        self.log_activity(
            channel_name,
            operator_id,
            ActivityType::AdminAction,
            Some(format!("Executed: {:?}", admin_result.operation)),
        ).await;
        
        Ok(admin_result)
    }
    
    /// Create a new encrypted channel
    async fn create_channel(
        &self,
        channel_name: &str,
        settings: ChannelSettings,
        creator_id: &str,
    ) -> LegionResult<AdminResult> {
        let mut channels = self.channels.write().await;
        
        if channels.contains_key(channel_name) {
            return Ok(AdminResult {
                operation: AdminOperation::CreateChannel {
                    channel: channel_name.to_string(),
                    settings,
                },
                success: false,
                message: "Channel already exists".to_string(),
                data: None,
                timestamp: SystemTime::now(),
            });
        }
        
        // Create the managed channel
        let managed_channel = ManagedChannel {
            info: ChannelInfo {
                name: channel_name.to_string(),
                settings: settings.clone(),
                member_count: 1,
                topic: settings.topic.clone(),
                modes: settings.modes.clone(),
                stats: ChannelStats::default(),
            },
            settings: settings.clone(),
            members: {
                let mut members = HashMap::new();
                members.insert(creator_id.to_string(), ChannelMember {
                    user_id: creator_id.to_string(),
                    nickname: creator_id.to_string(), // TODO: Get actual nickname
                    role: MemberRole::Founder,
                    joined_at: SystemTime::now(),
                    last_activity: SystemTime::now(),
                    public_key: None, // TODO: Get from identity
                    custom_permissions: None,
                    is_online: true,
                });
                members
            },
            bans: Vec::new(),
            stats: ChannelStats::default(),
            key_info: KeyInfo {
                key_version: 1,
                created_at: SystemTime::now(),
                rotation_schedule: Some(SystemTime::now() + self.server_settings.default_key_rotation_interval),
                member_key_count: 1,
                has_backup: false,
            },
            rate_limits: HashMap::new(),
            activity_log: Vec::new(),
        };
        
        let channel_info = managed_channel.info.clone();
        channels.insert(channel_name.to_string(), managed_channel);
        
        // Set up initial administrator
        let mut administrators = self.administrators.write().await;
        administrators.insert(channel_name.to_string(), vec![creator_id.to_string()]);
        
        info!("Created encrypted channel: {} by {}", channel_name, creator_id);
        
        Ok(AdminResult {
            operation: AdminOperation::CreateChannel {
                channel: channel_name.to_string(),
                settings,
            },
            success: true,
            message: "Channel created successfully".to_string(),
            data: Some(AdminData::ChannelInfo(channel_info)),
            timestamp: SystemTime::now(),
        })
    }
    
    /// Set channel topic
    async fn set_channel_topic(
        &self,
        channel_name: &str,
        topic: &str,
        operator_id: &str,
    ) -> LegionResult<AdminResult> {
        let mut channels = self.channels.write().await;
        
        if let Some(channel) = channels.get_mut(channel_name) {
            channel.settings.topic = Some(topic.to_string());
            channel.settings.topic_set_by = Some((operator_id.to_string(), SystemTime::now()));
            channel.info.topic = Some(topic.to_string());
            
            info!("Topic set for channel {}: {} by {}", channel_name, topic, operator_id);
            
            Ok(AdminResult {
                operation: AdminOperation::SetTopic {
                    channel: channel_name.to_string(),
                    topic: topic.to_string(),
                },
                success: true,
                message: "Topic updated successfully".to_string(),
                data: None,
                timestamp: SystemTime::now(),
            })
        } else {
            Ok(AdminResult {
                operation: AdminOperation::SetTopic {
                    channel: channel_name.to_string(),
                    topic: topic.to_string(),
                },
                success: false,
                message: "Channel not found".to_string(),
                data: None,
                timestamp: SystemTime::now(),
            })
        }
    }
    
    /// Set channel mode
    async fn set_channel_mode(
        &self,
        channel_name: &str,
        mode: ChannelMode,
        enabled: bool,
        operator_id: &str,
    ) -> LegionResult<AdminResult> {
        let mut channels = self.channels.write().await;
        
        if let Some(channel) = channels.get_mut(channel_name) {
            if enabled {
                channel.settings.modes.insert(mode.clone());
                channel.info.modes.insert(mode.clone());
            } else {
                channel.settings.modes.remove(&mode);
                channel.info.modes.remove(&mode);
            }
            
            info!("Mode {:?} {} for channel {} by {}", 
                  mode, if enabled { "enabled" } else { "disabled" }, channel_name, operator_id);
            
            Ok(AdminResult {
                operation: AdminOperation::SetMode {
                    channel: channel_name.to_string(),
                    mode,
                    enabled,
                },
                success: true,
                message: format!("Mode {} successfully", if enabled { "enabled" } else { "disabled" }),
                data: None,
                timestamp: SystemTime::now(),
            })
        } else {
            Ok(AdminResult {
                operation: AdminOperation::SetMode {
                    channel: channel_name.to_string(),
                    mode,
                    enabled,
                },
                success: false,
                message: "Channel not found".to_string(),
                data: None,
                timestamp: SystemTime::now(),
            })
        }
    }
    
    /// Execute member management operation
    async fn execute_member_operation(
        &self,
        channel_name: &str,
        target_user: &str,
        operation: MemberOperation,
        operator_id: &str,
    ) -> LegionResult<AdminResult> {
        let mut channels = self.channels.write().await;
        
        if let Some(channel) = channels.get_mut(channel_name) {
            match &operation {
                MemberOperation::Kick { reason } => {
                    if let Some(member) = channel.members.remove(target_user) {
                        channel.info.member_count = channel.members.len();
                        
                        let reason_str = reason.clone().unwrap_or_else(|| "No reason given".to_string());
                        info!("User {} kicked from channel {} by {}: {}", 
                              target_user, channel_name, operator_id, reason_str);
                        
                        Ok(AdminResult {
                            operation: AdminOperation::MemberOperation {
                                channel: channel_name.to_string(),
                                target: target_user.to_string(),
                                operation: MemberOperation::Kick { reason: Some(reason_str.clone()) },
                            },
                            success: true,
                            message: format!("User kicked: {}", reason_str),
                            data: None,
                            timestamp: SystemTime::now(),
                        })
                    } else {
                        Ok(AdminResult {
                            operation: AdminOperation::MemberOperation {
                                channel: channel_name.to_string(),
                                target: target_user.to_string(),
                                operation: operation.clone(),
                            },
                            success: false,
                            message: "User not found in channel".to_string(),
                            data: None,
                            timestamp: SystemTime::now(),
                        })
                    }
                },
                MemberOperation::SetRole { role } => {
                    if let Some(member) = channel.members.get_mut(target_user) {
                        let old_role = member.role.clone();
                        member.role = role.clone();
                        
                        info!("User {} role changed from {:?} to {:?} in channel {} by {}", 
                              target_user, old_role, role, channel_name, operator_id);
                        
                        Ok(AdminResult {
                            operation: AdminOperation::MemberOperation {
                                channel: channel_name.to_string(),
                                target: target_user.to_string(),
                                operation: MemberOperation::SetRole { role: role.clone() },
                            },
                            success: true,
                            message: format!("Role changed from {:?} to {:?}", old_role, role),
                            data: None,
                            timestamp: SystemTime::now(),
                        })
                    } else {
                        Ok(AdminResult {
                            operation: AdminOperation::MemberOperation {
                                channel: channel_name.to_string(),
                                target: target_user.to_string(),
                                operation: operation.clone(),
                            },
                            success: false,
                            message: "User not found in channel".to_string(),
                            data: None,
                            timestamp: SystemTime::now(),
                        })
                    }
                },
                // TODO: Implement other member operations
                _ => Ok(AdminResult {
                    operation: AdminOperation::MemberOperation {
                        channel: channel_name.to_string(),
                        target: target_user.to_string(),
                        operation,
                    },
                    success: false,
                    message: "Operation not yet implemented".to_string(),
                    data: None,
                    timestamp: SystemTime::now(),
                }),
            }
        } else {
            Ok(AdminResult {
                operation: AdminOperation::MemberOperation {
                    channel: channel_name.to_string(),
                    target: target_user.to_string(),
                    operation,
                },
                success: false,
                message: "Channel not found".to_string(),
                data: None,
                timestamp: SystemTime::now(),
            })
        }
    }
    
    /// Execute ban operation
    async fn execute_ban_operation(
        &self,
        channel_name: &str,
        target_pattern: &str,
        operation: BanOperation,
        duration: Option<SystemTime>,
        operator_id: &str,
    ) -> LegionResult<AdminResult> {
        let mut channels = self.channels.write().await;
        
        if let Some(channel) = channels.get_mut(channel_name) {
            match &operation {
                BanOperation::Add { reason } => {
                    let ban = ChannelBan {
                        pattern: target_pattern.to_string(),
                        reason: reason.clone(),
                        set_by: operator_id.to_string(),
                        set_at: SystemTime::now(),
                        expires_at: duration,
                        ban_type: BanType::Full,
                    };
                    
                    channel.bans.push(ban);
                    
                    info!("Ban added for pattern {} in channel {} by {}: {}", 
                          target_pattern, channel_name, operator_id, 
                          reason.as_ref().map(|r| r.as_str()).unwrap_or("No reason"));
                    
                    Ok(AdminResult {
                        operation: AdminOperation::BanOperation {
                            channel: channel_name.to_string(),
                            target: target_pattern.to_string(),
                            operation: BanOperation::Add { reason: reason.clone() },
                            duration,
                        },
                        success: true,
                        message: "Ban added successfully".to_string(),
                        data: None,
                        timestamp: SystemTime::now(),
                    })
                },
                BanOperation::Remove => {
                    let initial_len = channel.bans.len();
                    channel.bans.retain(|ban| ban.pattern != target_pattern);
                    
                    if channel.bans.len() < initial_len {
                        info!("Ban removed for pattern {} in channel {} by {}", 
                              target_pattern, channel_name, operator_id);
                        
                        Ok(AdminResult {
                            operation: AdminOperation::BanOperation {
                                channel: channel_name.to_string(),
                                target: target_pattern.to_string(),
                                operation: BanOperation::Remove,
                                duration: None,
                            },
                            success: true,
                            message: "Ban removed successfully".to_string(),
                            data: None,
                            timestamp: SystemTime::now(),
                        })
                    } else {
                        Ok(AdminResult {
                            operation: AdminOperation::BanOperation {
                                channel: channel_name.to_string(),
                                target: target_pattern.to_string(),
                                operation: BanOperation::Remove,
                                duration: None,
                            },
                            success: false,
                            message: "Ban not found".to_string(),
                            data: None,
                            timestamp: SystemTime::now(),
                        })
                    }
                },
                BanOperation::List => {
                    let active_bans: Vec<ChannelBan> = channel.bans.iter()
                        .filter(|ban| ban.is_active())
                        .cloned()
                        .collect();
                    
                    Ok(AdminResult {
                        operation: AdminOperation::BanOperation {
                            channel: channel_name.to_string(),
                            target: target_pattern.to_string(),
                            operation: BanOperation::List,
                            duration: None,
                        },
                        success: true,
                        message: format!("Found {} active bans", active_bans.len()),
                        data: Some(AdminData::BanList(active_bans)),
                        timestamp: SystemTime::now(),
                    })
                },
                BanOperation::Check => {
                    let is_banned = channel.bans.iter()
                        .any(|ban| ban.is_active() && ban.matches_pattern(target_pattern));
                    
                    Ok(AdminResult {
                        operation: AdminOperation::BanOperation {
                            channel: channel_name.to_string(),
                            target: target_pattern.to_string(),
                            operation: BanOperation::Check,
                            duration: None,
                        },
                        success: true,
                        message: if is_banned { "Pattern is banned" } else { "Pattern is not banned" }.to_string(),
                        data: None,
                        timestamp: SystemTime::now(),
                    })
                },
            }
        } else {
            Ok(AdminResult {
                operation: AdminOperation::BanOperation {
                    channel: channel_name.to_string(),
                    target: target_pattern.to_string(),
                    operation,
                    duration,
                },
                success: false,
                message: "Channel not found".to_string(),
                data: None,
                timestamp: SystemTime::now(),
            })
        }
    }
    
    /// Execute key management operation
    async fn execute_key_operation(
        &self,
        channel_name: &str,
        operation: KeyOperation,
        operator_identity: &Identity,
    ) -> LegionResult<AdminResult> {
        let mut channels = self.channels.write().await;
        
        if let Some(channel) = channels.get_mut(channel_name) {
            match operation {
                KeyOperation::Rotate => {
                    // TODO: Integrate with actual key rotation system
                    channel.key_info.key_version += 1;
                    channel.key_info.created_at = SystemTime::now();
                    channel.key_info.rotation_schedule = Some(
                        SystemTime::now() + self.server_settings.default_key_rotation_interval
                    );
                    
                    info!("Key rotation performed for channel {} to version {}", 
                          channel_name, channel.key_info.key_version);
                    
                    Ok(AdminResult {
                        operation: AdminOperation::KeyOperation {
                            channel: channel_name.to_string(),
                            operation: KeyOperation::Rotate,
                        },
                        success: true,
                        message: format!("Keys rotated to version {}", channel.key_info.key_version),
                        data: Some(AdminData::KeyInfo(channel.key_info.clone())),
                        timestamp: SystemTime::now(),
                    })
                },
                // TODO: Implement other key operations
                _ => Ok(AdminResult {
                    operation: AdminOperation::KeyOperation {
                        channel: channel_name.to_string(),
                        operation,
                    },
                    success: false,
                    message: "Key operation not yet implemented".to_string(),
                    data: None,
                    timestamp: SystemTime::now(),
                }),
            }
        } else {
            Ok(AdminResult {
                operation: AdminOperation::KeyOperation {
                    channel: channel_name.to_string(),
                    operation,
                },
                success: false,
                message: "Channel not found".to_string(),
                data: None,
                timestamp: SystemTime::now(),
            })
        }
    }
    
    /// Get extended channel information including admin details
    pub async fn get_extended_channel_info(&self, channel_name: &str) -> LegionResult<ExtendedChannelInfo> {
        let channels = self.channels.read().await;
        let administrators = self.administrators.read().await;
        
        if let Some(channel) = channels.get(channel_name) {
            let admins = administrators.get(channel_name).cloned().unwrap_or_default();
            let recent_activity = channel.activity_log.iter()
                .rev()
                .take(10)
                .cloned()
                .collect();
            
            Ok(ExtendedChannelInfo {
                basic: channel.info.clone(),
                administrators: admins,
                recent_activity,
                health_metrics: self.calculate_channel_health(channel).await,
                security_status: self.assess_security_status(channel).await,
            })
        } else {
            Err(LegionError::Channel(format!("Channel not found: {}", channel_name)))
        }
    }
    
    /// Calculate channel health metrics
    async fn calculate_channel_health(&self, channel: &ManagedChannel) -> ChannelHealth {
        let mut issues = Vec::new();
        let mut health_score = 100u8;
        
        // Check for issues
        if channel.stats.messages_today > 1000.0 {
            issues.push(HealthIssue::HighMessageRate);
            health_score = health_score.saturating_sub(10);
        }
        
        if channel.bans.len() > 20 {
            issues.push(HealthIssue::ExcessiveBans);
            health_score = health_score.saturating_sub(15);
        }
        
        if let Some(rotation_time) = channel.key_info.rotation_schedule {
            if SystemTime::now() > rotation_time {
                issues.push(HealthIssue::OverdueKeyRotation);
                health_score = health_score.saturating_sub(25);
            }
        }
        
        if channel.members.len() > 80 {
            issues.push(HealthIssue::HighMemberCount);
            health_score = health_score.saturating_sub(5);
        }
        
        ChannelHealth {
            health_score,
            issues,
            performance: PerformanceMetrics {
                avg_message_time: Duration::from_millis(50), // TODO: Calculate actual metrics
                messages_per_second: channel.stats.avg_messages_per_day / 86400.0,
                encryption_ops_per_second: 10.0, // TODO: Calculate actual rate
                memory_usage: 1024 * 1024, // TODO: Calculate actual usage
            },
        }
    }
    
    /// Assess channel security status
    async fn assess_security_status(&self, channel: &ManagedChannel) -> SecurityStatus {
        SecurityStatus {
            encryption_active: true, // Legion channels are always encrypted
            key_rotation_current: channel.key_info.rotation_schedule
                .map(|schedule| SystemTime::now() < schedule)
                .unwrap_or(false),
            all_members_verified: channel.members.values()
                .all(|member| member.public_key.is_some()),
            recent_security_events: Vec::new(), // TODO: Implement security event tracking
        }
    }
    
    /// Log an administrative operation
    async fn log_operation(
        &self,
        channel_name: &str,
        operator_id: &str,
        operation: AdminOperation,
        result: AdminResult,
    ) {
        let mut history = self.operation_history.write().await;
        history.push(ChannelOperation {
            timestamp: SystemTime::now(),
            channel: channel_name.to_string(),
            operator: operator_id.to_string(),
            operation,
            result,
            context: None,
        });
        
        // Keep only last 1000 operations
        let history_len = history.len();
        if history_len > 1000 {
            history.drain(..history_len - 1000);
        }
    }
    
    /// Log channel activity
    async fn log_activity(
        &self,
        channel_name: &str,
        user_id: &str,
        activity_type: ActivityType,
        details: Option<String>,
    ) {
        let mut channels = self.channels.write().await;
        if let Some(channel) = channels.get_mut(channel_name) {
            channel.activity_log.push(ActivityEntry {
                timestamp: SystemTime::now(),
                activity_type,
                user_id: user_id.to_string(),
                details,
            });
            
            // Keep only last 100 activity entries per channel
            if channel.activity_log.len() > 100 {
                channel.activity_log.drain(..channel.activity_log.len() - 100);
            }
        }
    }
    
    /// Get user role in channel
    async fn get_user_role(&self, channel_name: &str, user_id: &str) -> LegionResult<MemberRole> {
        let channels = self.channels.read().await;
        if let Some(channel) = channels.get(channel_name) {
            if let Some(member) = channel.members.get(user_id) {
                Ok(member.role.clone())
            } else {
                Err(LegionError::Member(format!("User not found in channel: {}", user_id)))
            }
        } else {
            Err(LegionError::Channel(format!("Channel not found: {}", channel_name)))
        }
    }
    
    /// Get user permissions in channel
    async fn get_user_permissions(&self, channel_name: &str, user_id: &str) -> LegionResult<HashSet<Permission>> {
        let channels = self.channels.read().await;
        if let Some(channel) = channels.get(channel_name) {
            if let Some(member) = channel.members.get(user_id) {
                Ok(member.custom_permissions.clone().unwrap_or_default())
            } else {
                Err(LegionError::Member(format!("User not found in channel: {}", user_id)))
            }
        } else {
            Err(LegionError::Channel(format!("Channel not found: {}", channel_name)))
        }
    }
    
    /// Get channel settings
    async fn get_channel_settings(&self, channel_name: &str) -> LegionResult<ChannelSettings> {
        let channels = self.channels.read().await;
        if let Some(channel) = channels.get(channel_name) {
            Ok(channel.settings.clone())
        } else {
            Err(LegionError::Channel(format!("Channel not found: {}", channel_name)))
        }
    }
    
    /// Process scheduled operations (should be called periodically)
    pub async fn process_scheduled_operations(&self) -> LegionResult<usize> {
        let mut scheduled = self.scheduled_operations.write().await;
        let now = SystemTime::now();
        
        let mut processed = 0;
        let mut remaining_operations = Vec::new();
        
        for operation in scheduled.drain(..) {
            if operation.scheduled_time <= now {
                // TODO: Execute the scheduled operation
                info!("Processing scheduled operation for channel {}: {:?}", 
                      operation.channel, operation.operation);
                processed += 1;
                
                // If recurring, reschedule
                if let Some(interval) = operation.recurring {
                    let mut new_operation = operation;
                    new_operation.scheduled_time = now + interval;
                    remaining_operations.push(new_operation);
                }
            } else {
                remaining_operations.push(operation);
            }
        }
        
        *scheduled = remaining_operations;
        Ok(processed)
    }
}

// Import necessary types that aren't exported from the current modules
use legion_protocol::admin::{ChannelInfo, ChannelStats, ChannelMember, ChannelBan, BanType, KeyInfo, AdminData};

#[cfg(test)]
mod tests {
    use super::*;
    
    #[tokio::test]
    async fn test_channel_creation() {
        let settings = ServerChannelSettings::default();
        let manager = AdvancedChannelManager::new(settings).await.unwrap();
        
        let identity = phalanx_crypto::Identity::generate();
        let result = manager.execute_admin_operation(
            "!test",
            AdminOperation::CreateChannel {
                channel: "!test".to_string(),
                settings: ChannelSettings::default(),
            },
            "creator",
            &identity,
        ).await.unwrap();
        
        assert!(result.success);
    }
    
    #[tokio::test]
    async fn test_topic_setting() {
        let settings = ServerChannelSettings::default();
        let manager = AdvancedChannelManager::new(settings).await.unwrap();
        
        let identity = phalanx_crypto::Identity::generate();
        
        // Create channel first
        let _create_result = manager.execute_admin_operation(
            "!test",
            AdminOperation::CreateChannel {
                channel: "!test".to_string(),
                settings: ChannelSettings::default(),
            },
            "creator",
            &identity,
        ).await.unwrap();
        
        // Set topic
        let result = manager.execute_admin_operation(
            "!test",
            AdminOperation::SetTopic {
                channel: "!test".to_string(),
                topic: "Test channel topic".to_string(),
            },
            "creator",
            &identity,
        ).await.unwrap();
        
        assert!(result.success);
    }
}