scirs2-metrics 0.4.3

//! Collaboration features for interactive visualization
//!
//! This module provides multi-user collaboration capabilities for
//! shared dashboard editing and real-time synchronization.

#![allow(clippy::too_many_arguments)]
#![allow(dead_code)]

use super::core::{CollaborationConfig, PermissionLevel};
use crate::error::{MetricsError, Result};
use serde::{Deserialize, Serialize};
use serde_json::Value;
use std::collections::HashMap;
use std::time::{Duration, Instant};

/// Collaboration manager for multi-user dashboards
#[derive(Debug)]
pub struct CollaborationManager {
    /// Configuration
    config: CollaborationConfig,
    /// Active sessions
    sessions: HashMap<String, UserSession>,
    /// Shared state
    shared_state: SharedState,
    /// Operation history
    operation_history: Vec<Operation>,
    /// Conflict resolver
    conflict_resolver: ConflictResolver,
}

/// User session information
#[derive(Debug, Clone)]
pub struct UserSession {
    /// Session ID
    pub session_id: String,
    /// User ID
    pub user_id: String,
    /// User name
    pub user_name: String,
    /// Permission level
    pub permissions: PermissionLevel,
    /// Last activity timestamp
    pub last_activity: Instant,
    /// Current cursor position
    pub cursor_position: Option<CursorPosition>,
    /// Active selections
    pub selections: Vec<Selection>,
}

/// Cursor position in the dashboard
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CursorPosition {
    /// X coordinate
    pub x: f64,
    /// Y coordinate
    pub y: f64,
    /// Widget ID (if hovering over widget)
    pub widget_id: Option<String>,
}

/// Selection in the dashboard
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Selection {
    /// Selection ID
    pub id: String,
    /// Selected widget IDs
    pub widget_ids: Vec<String>,
    /// Selection bounds
    pub bounds: SelectionBounds,
    /// Selection type
    pub selection_type: SelectionType,
}

/// Selection bounds
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SelectionBounds {
    /// Top-left X coordinate
    pub x: f64,
    /// Top-left Y coordinate
    pub y: f64,
    /// Width
    pub width: f64,
    /// Height
    pub height: f64,
}

/// Selection type enumeration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum SelectionType {
    /// Single widget selection
    Single,
    /// Multiple widget selection
    Multiple,
    /// Area selection
    Area,
    /// Text selection
    Text,
}

/// Shared state for collaborative editing
#[derive(Debug, Clone)]
pub struct SharedState {
    /// Dashboard state
    pub dashboard_state: Value,
    /// Widget states
    pub widget_states: HashMap<String, Value>,
    /// Global settings
    pub global_settings: HashMap<String, Value>,
    /// Version vector for consistency
    pub version_vector: HashMap<String, u64>,
}

/// Collaborative operation
#[derive(Debug, Clone)]
pub struct Operation {
    /// Operation ID
    pub id: String,
    /// Operation type
    pub operation_type: OperationType,
    /// User ID who performed the operation
    pub user_id: String,
    /// Timestamp
    pub timestamp: Instant,
    /// Operation data
    pub data: Value,
    /// Target (widget ID, etc.)
    pub target: String,
    /// Dependencies (operation IDs)
    pub dependencies: Vec<String>,
}

/// Operation type enumeration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum OperationType {
    /// Create widget
    Create,
    /// Update widget
    Update,
    /// Delete widget
    Delete,
    /// Move widget
    Move,
    /// Resize widget
    Resize,
    /// Change style
    StyleChange,
    /// Data update
    DataUpdate,
    /// Custom operation
    Custom(String),
}

/// Conflict resolver for handling concurrent operations
#[derive(Debug)]
pub struct ConflictResolver {
    /// Resolution strategy
    strategy: ConflictResolutionStrategy,
    /// Pending conflicts
    pending_conflicts: Vec<Conflict>,
}

/// Conflict resolution strategy
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ConflictResolutionStrategy {
    /// Last writer wins
    LastWriterWins,
    /// First writer wins
    FirstWriterWins,
    /// Operational transform
    OperationalTransform,
    /// Manual resolution
    Manual,
    /// Custom strategy
    Custom(String),
}

/// Conflict between operations
#[derive(Debug, Clone)]
pub struct Conflict {
    /// Conflict ID
    pub id: String,
    /// Conflicting operations
    pub operations: Vec<Operation>,
    /// Conflict type
    pub conflict_type: ConflictType,
    /// Resolution status
    pub status: ConflictStatus,
    /// Proposed resolution
    pub proposed_resolution: Option<Operation>,
}

/// Conflict type enumeration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ConflictType {
    /// Concurrent modifications
    ConcurrentModification,
    /// Version mismatch
    VersionMismatch,
    /// Permission conflict
    PermissionConflict,
    /// Data integrity conflict
    DataIntegrity,
    /// Custom conflict
    Custom(String),
}

/// Conflict status enumeration
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum ConflictStatus {
    /// Pending resolution
    Pending,
    /// Automatically resolved
    AutoResolved,
    /// Manually resolved
    ManuallyResolved,
    /// Ignored
    Ignored,
}

impl CollaborationManager {
    /// Create new collaboration manager
    pub fn new(config: CollaborationConfig) -> Self {
        Self {
            config,
            sessions: HashMap::new(),
            shared_state: SharedState::new(),
            operation_history: Vec::new(),
            conflict_resolver: ConflictResolver::new(),
        }
    }

    /// Add user session
    pub fn add_session(&mut self, session: UserSession) -> Result<()> {
        if self.sessions.len() >= self.config.max_collaborators as usize {
            return Err(MetricsError::ComputationError(
                "Maximum number of collaborators reached".to_string(),
            ));
        }

        self.sessions.insert(session.session_id.clone(), session);
        Ok(())
    }

    /// Remove user session
    pub fn remove_session(&mut self, session_id: &str) -> Result<()> {
        self.sessions.remove(session_id);
        Ok(())
    }

    /// Apply operation
    pub fn apply_operation(&mut self, operation: Operation) -> Result<()> {
        // Check permissions
        if let Some(session) = self.sessions.get(&operation.user_id) {
            if !self.has_permission(&session.permissions, &operation.operation_type) {
                return Err(MetricsError::InvalidInput(
                    "Insufficient permissions".to_string(),
                ));
            }
        }

        // Check for conflicts
        if let Some(conflict) = self
            .conflict_resolver
            .detect_conflict(&operation, &self.operation_history)
        {
            self.conflict_resolver.pending_conflicts.push(conflict);
            return Ok(()); // Don't apply yet, needs resolution
        }

        // Apply operation to shared state
        self.apply_operation_to_state(&operation)?;

        // Add to history
        self.operation_history.push(operation);

        Ok(())
    }

    /// Apply operation to shared state
    fn apply_operation_to_state(&mut self, operation: &Operation) -> Result<()> {
        match operation.operation_type {
            OperationType::Create => {
                self.shared_state
                    .widget_states
                    .insert(operation.target.clone(), operation.data.clone());
            }
            OperationType::Update => {
                if let Some(widget_state) =
                    self.shared_state.widget_states.get_mut(&operation.target)
                {
                    // Merge update data
                    if let (Value::Object(current), Value::Object(update)) =
                        (widget_state, &operation.data)
                    {
                        for (key, value) in update {
                            current.insert(key.clone(), value.clone());
                        }
                    }
                }
            }
            OperationType::Delete => {
                self.shared_state.widget_states.remove(&operation.target);
            }
            _ => {
                // Handle other operation types
            }
        }

        // Update version vector
        self.shared_state
            .version_vector
            .entry(operation.user_id.clone())
            .and_modify(|v| *v += 1)
            .or_insert(1);

        Ok(())
    }

    /// Check if user has permission for operation
    fn has_permission(&self, permission: &PermissionLevel, operation: &OperationType) -> bool {
        match (permission, operation) {
            (PermissionLevel::Admin, _) => true,
            (
                PermissionLevel::Edit,
                OperationType::Create | OperationType::Update | OperationType::Delete,
            ) => true,
            (PermissionLevel::Comment, _) => false, // Comments not implemented in this example
            (PermissionLevel::ReadOnly, _) => false,
            _ => false,
        }
    }

    /// Get active sessions
    pub fn get_active_sessions(&self) -> Vec<&UserSession> {
        self.sessions.values().collect()
    }

    /// Update user cursor position
    pub fn update_cursor(&mut self, session_id: &str, position: CursorPosition) -> Result<()> {
        if let Some(session) = self.sessions.get_mut(session_id) {
            session.cursor_position = Some(position);
            session.last_activity = Instant::now();
        }
        Ok(())
    }

    /// Get shared state
    pub fn get_shared_state(&self) -> &SharedState {
        &self.shared_state
    }

    /// Resolve conflicts using the conflict resolver
    pub fn resolve_conflicts(&mut self) -> Result<Vec<Operation>> {
        self.conflict_resolver.resolve_conflicts()
    }
}

impl SharedState {
    /// Create new shared state
    pub fn new() -> Self {
        Self {
            dashboard_state: Value::Object(serde_json::Map::new()),
            widget_states: HashMap::new(),
            global_settings: HashMap::new(),
            version_vector: HashMap::new(),
        }
    }
}

impl ConflictResolver {
    /// Create new conflict resolver
    pub fn new() -> Self {
        Self {
            strategy: ConflictResolutionStrategy::LastWriterWins,
            pending_conflicts: Vec::new(),
        }
    }

    /// Detect conflict between operation and history
    pub fn detect_conflict(
        &self,
        operation: &Operation,
        history: &[Operation],
    ) -> Option<Conflict> {
        // Simplified conflict detection
        for existing_op in history.iter().rev().take(10) {
            if existing_op.target == operation.target
                && existing_op.timestamp
                    > operation
                        .timestamp
                        .checked_sub(Duration::from_secs(5))
                        .unwrap_or(operation.timestamp)
            {
                return Some(Conflict {
                    id: format!("conflict_{}", scirs2_core::random::random::<u64>()),
                    operations: vec![existing_op.clone(), operation.clone()],
                    conflict_type: ConflictType::ConcurrentModification,
                    status: ConflictStatus::Pending,
                    proposed_resolution: None,
                });
            }
        }
        None
    }

    /// Resolve pending conflicts
    pub fn resolve_conflicts(&mut self) -> Result<Vec<Operation>> {
        let mut resolved_operations = Vec::new();

        for conflict in &mut self.pending_conflicts {
            match self.strategy {
                ConflictResolutionStrategy::LastWriterWins => {
                    if let Some(latest_op) =
                        conflict.operations.iter().max_by_key(|op| op.timestamp)
                    {
                        resolved_operations.push(latest_op.clone());
                        conflict.status = ConflictStatus::AutoResolved;
                    }
                }
                ConflictResolutionStrategy::FirstWriterWins => {
                    if let Some(earliest_op) =
                        conflict.operations.iter().min_by_key(|op| op.timestamp)
                    {
                        resolved_operations.push(earliest_op.clone());
                        conflict.status = ConflictStatus::AutoResolved;
                    }
                }
                _ => {
                    // Other strategies would be implemented here
                }
            }
        }

        // Remove resolved conflicts
        self.pending_conflicts
            .retain(|conflict| conflict.status == ConflictStatus::Pending);

        Ok(resolved_operations)
    }
}

impl Default for SharedState {
    fn default() -> Self {
        Self::new()
    }
}