import Foundation

// MARK: - Thread

public struct Thread: Codable, Identifiable, Hashable, Sendable {
    public let id: String
    public let participants: [User]
    public let lastMessage: Message?
    public let unreadCount: Int
    public let isArchived: Bool
    public let createdAt: Date
    public let updatedAt: Date
    public let metadata: ThreadMetadata?

    public init(
        id: String,
        participants: [User],
        lastMessage: Message?,
        unreadCount: Int,
        isArchived: Bool,
        createdAt: Date,
        updatedAt: Date,
        metadata: ThreadMetadata?
    ) {
        self.id = id
        self.participants = participants
        self.lastMessage = lastMessage
        self.unreadCount = unreadCount
        self.isArchived = isArchived
        self.createdAt = createdAt
        self.updatedAt = updatedAt
        self.metadata = metadata
    }

    public var otherParticipant: User? {
        participants.first
    }

    public var displayTitle: String {
        if let other = otherParticipant {
            return other.displayName
        }
        return participants.map(\.displayName).joined(separator: ", ")
    }
}

// MARK: - Thread Metadata

public struct ThreadMetadata: Codable, Hashable, Sendable {
    public let isPinned: Bool?
    public let isMuted: Bool?
    public let customLabel: String?
    public let lastReadMessageId: String?

    public init(
        isPinned: Bool?,
        isMuted: Bool?,
        customLabel: String?,
        lastReadMessageId: String?
    ) {
        self.isPinned = isPinned
        self.isMuted = isMuted
        self.customLabel = customLabel
        self.lastReadMessageId = lastReadMessageId
    }
}