initial commit

ios_client/EncryptedChat/Models/Conversation.swift

@@ -0,0 +1,46 @@
+import Foundation
+
+struct Conversation: Identifiable, Equatable {
+    let id: String
+    var name: String?
+    var members: [ConversationMember]
+    var createdBy: String?
+    var avatarFile: String?
+    var unreadCount: Int
+    var isFavorite: Bool
+    var lastMessageTime: Date?
+
+    var isGroup: Bool {
+        name != nil || members.count > 2
+    }
+
+    /// Display name: group name, or DM partner username
+    func displayName(currentUserId: String) -> String {
+        if let name = name, !name.isEmpty {
+            return name
+        }
+        // DM: show the other person's name
+        if let other = members.first(where: { $0.userId != currentUserId }) {
+            return other.username
+        }
+        return "Unknown"
+    }
+
+    /// DM partner user ID (nil for groups)
+    func dmPartnerId(currentUserId: String) -> String? {
+        guard !isGroup else { return nil }
+        return members.first(where: { $0.userId != currentUserId })?.userId
+    }
+
+    static func == (lhs: Conversation, rhs: Conversation) -> Bool {
+        lhs.id == rhs.id
+    }
+}
+
+struct ConversationMember: Identifiable, Equatable, Codable {
+    let userId: String
+    var username: String
+    var email: String
+
+    var id: String { userId }
+}