/**
 * @file collaboration.ts
 * @description Collaboration interfaces
 * Comments, suggestions, user presence, and collaborative editing support
 */

import * as plugins from './plugins.js';
import type {
  TPresenceStatus,
  TCommentThreadStatus,
  TSuggestionStatus,
  TSuggestionChangeType,
  TConflictResolutionStrategy,
  TEditingMode,
  TCollaborationPermission,
} from './types.js';
import type { IVersionChange } from './versioning.js';

// ============================================================================
// USER PRESENCE
// ============================================================================

/**
 * User's current location in document
 */
export interface IUserLocation {
  paragraphId?: string;
  characterPosition?: number;
  selectionRange?: {
    start: number;
    end: number;
  };
}

/**
 * Device information for presence
 */
export interface IDeviceInfo {
  type: 'desktop' | 'tablet' | 'mobile';
  browser?: string;
}

/**
 * User presence information
 */
export interface IUserPresence {
  userId: string;
  displayName: string;
  avatarUrl?: string;
  color: string;
  status: TPresenceStatus;
  currentLocation?: IUserLocation;
  lastActivity: number;
  sessionStarted: number;
  deviceInfo?: IDeviceInfo;
}

/**
 * Real-time cursor position for collaborative editing
 */
export interface ICursorPosition {
  userId: string;
  paragraphId: string;
  offset: number;
  timestamp: number;
}

// ============================================================================
// COMMENTS
// ============================================================================

/**
 * Anchor point for a comment
 */
export interface ICommentAnchor {
  type: 'paragraph' | 'text_range' | 'document' | 'party' | 'attachment';
  paragraphId?: string;
  textRange?: {
    start: number;
    end: number;
    quotedText: string;
  };
  elementPath?: string;
}

/**
 * User mention in comment
 */
export interface IMention {
  userId: string;
  displayName: string;
  notified: boolean;
  notifiedAt?: number;
}

/**
 * Reaction on a comment
 */
export interface IReaction {
  emoji: string;
  userId: string;
  timestamp: number;
}

/**
 * Individual comment within a thread
 */
export interface IComment {
  id: string;
  threadId: string;
  authorId: string;
  authorDisplayName: string;
  authorAvatarUrl?: string;
  content: string;
  createdAt: number;
  editedAt?: number;
  mentions: IMention[];
  reactions: IReaction[];
  parentCommentId?: string;
  isDeleted: boolean;
}

/**
 * Comment thread on a specific location
 */
export interface ICommentThread {
  id: string;
  contractId: string;
  versionId: string;
  anchor: ICommentAnchor;
  status: TCommentThreadStatus;
  resolvedBy?: string;
  resolvedAt?: number;
  comments: IComment[];
  createdAt: number;
  createdBy: string;
  lastActivityAt: number;
}

// ============================================================================
// SUGGESTIONS
// ============================================================================

/**
 * Suggestion for proposed changes (track changes mode)
 */
export interface ISuggestion {
  id: string;
  contractId: string;
  versionId: string;
  targetParagraphId: string;
  targetTextRange?: {
    start: number;
    end: number;
  };
  changeType: TSuggestionChangeType;
  originalContent: string;
  suggestedContent: string;
  status: TSuggestionStatus;
  suggestedBy: string;
  suggestedByDisplayName: string;
  suggestedAt: number;
  reviewedBy?: string;
  reviewedAt?: number;
  rejectionReason?: string;
  discussionThreadId?: string;
}

// ============================================================================
// CONFLICTS
// ============================================================================

/**
 * Conflicting change from a user
 */
export interface IConflictingChange {
  userId: string;
  userDisplayName: string;
  content: string;
  timestamp: number;
}

/**
 * Conflict marker for simultaneous edits
 */
export interface IEditConflict {
  id: string;
  contractId: string;
  paragraphId: string;
  baseContent: string;
  changes: IConflictingChange[];
  status: 'unresolved' | 'resolved' | 'auto_merged';
  resolvedContent?: string;
  resolvedBy?: string;
  resolvedAt?: number;
  resolutionStrategy?: TConflictResolutionStrategy;
}

// ============================================================================
// COLLABORATION SESSION
// ============================================================================

/**
 * Collaborative editing session
 */
export interface ICollaborationSession {
  id: string;
  contractId: string;
  versionId: string;
  participants: IUserPresence[];
  editingMode: TEditingMode;
  activeCursors: ICursorPosition[];
  pendingChanges: IVersionChange[];
  startedAt: number;
  lastActivityAt: number;
  autoSaveInterval: number;
}

// ============================================================================
// COLLABORATOR
// ============================================================================

/**
 * Notification preferences for a collaborator
 */
export interface INotificationPreferences {
  onComment: boolean;
  onSuggestion: boolean;
  onVersionPublish: boolean;
  onSignatureRequest: boolean;
}

/**
 * Collaborator with permission
 */
export interface ICollaborator {
  userId: string;
  contact: plugins.tsclass.business.TContact;
  permission: TCollaborationPermission;
  invitedBy: string;
  invitedAt: number;
  acceptedAt?: number;
  expiresAt?: number;
  notificationPreferences: INotificationPreferences;
}

// ============================================================================
// FACTORY FUNCTIONS
// ============================================================================

/**
 * Create a new comment thread
 */
export function createCommentThread(
  contractId: string,
  versionId: string,
  anchor: ICommentAnchor,
  userId: string
): ICommentThread {
  const now = Date.now();
  return {
    id: crypto.randomUUID(),
    contractId,
    versionId,
    anchor,
    status: 'open',
    comments: [],
    createdAt: now,
    createdBy: userId,
    lastActivityAt: now,
  };
}

/**
 * Create a new comment
 */
export function createComment(
  threadId: string,
  authorId: string,
  authorDisplayName: string,
  content: string
): IComment {
  return {
    id: crypto.randomUUID(),
    threadId,
    authorId,
    authorDisplayName,
    content,
    createdAt: Date.now(),
    mentions: [],
    reactions: [],
    isDeleted: false,
  };
}

/**
 * Create a new suggestion
 */
export function createSuggestion(
  contractId: string,
  versionId: string,
  targetParagraphId: string,
  changeType: TSuggestionChangeType,
  originalContent: string,
  suggestedContent: string,
  suggestedBy: string,
  suggestedByDisplayName: string
): ISuggestion {
  return {
    id: crypto.randomUUID(),
    contractId,
    versionId,
    targetParagraphId,
    changeType,
    originalContent,
    suggestedContent,
    status: 'pending',
    suggestedBy,
    suggestedByDisplayName,
    suggestedAt: Date.now(),
  };
}

/**
 * Create a new collaborator
 */
export function createCollaborator(
  userId: string,
  contact: plugins.tsclass.business.TContact,
  permission: TCollaborationPermission,
  invitedBy: string
): ICollaborator {
  return {
    userId,
    contact,
    permission,
    invitedBy,
    invitedAt: Date.now(),
    notificationPreferences: {
      onComment: true,
      onSuggestion: true,
      onVersionPublish: true,
      onSignatureRequest: true,
    },
  };
}

/**
 * Create default user presence
 */
export function createUserPresence(
  userId: string,
  displayName: string,
  color: string
): IUserPresence {
  const now = Date.now();
  return {
    userId,
    displayName,
    color,
    status: 'viewing',
    lastActivity: now,
    sessionStarted: now,
  };
}