import Foundation

public enum SMSDirection: String, Equatable, Sendable {
    case incoming
    case outgoing
    case unknown

    public var label: String {
        switch self {
        case .incoming: return "收件"
        case .outgoing: return "发件"
        case .unknown: return "未知"
        }
    }
}

public struct SMSMessage: Equatable, Identifiable, Sendable {
    /// 上游消息 id 只在单个节点内唯一，聚合展示时不能直接当 Identifiable 用。
    public let upstreamID: String
    public let instanceID: UUID
    public let instanceName: String
    public let phoneNumber: String
    public let content: String
    public let direction: SMSDirection
    public let status: String
    public let timestamp: String
    public var id: String { "\(instanceID.uuidString)#\(upstreamID)" }

    /// 上游 status 是英文原词，列表里直接展示会混进一行英文；未知值仍然原样显示，不做假结论。
    public var statusLabel: String? {
        let key = status.trimmingCharacters(in: .whitespaces).lowercased()
        guard key.isEmpty == false else { return nil }
        switch key {
        case "received", "in", "incoming": return "已接收"
        case "sent": return "已发送"
        case "delivered": return "已送达"
        case "read": return "已读"
        case "failed", "error": return "发送失败"
        case "pending", "queued", "sending": return "发送中"
        default: return status
        }
    }

    /// 收件的"已接收"和方向标签说的是同一件事，只有发件状态才值得再占一个位置。
    public var deliveryLabel: String? {
        guard direction == .outgoing else { return nil }
        return statusLabel
    }

    public init(
        upstreamID: String,
        instanceID: UUID,
        instanceName: String,
        phoneNumber: String,
        content: String,
        direction: SMSDirection,
        status: String,
        timestamp: String
    ) {
        self.upstreamID = upstreamID
        self.instanceID = instanceID
        self.instanceName = instanceName
        self.phoneNumber = phoneNumber
        self.content = content
        self.direction = direction
        self.status = status
        self.timestamp = timestamp
    }
}

public struct MessagePage: Equatable, Sendable {
    public let messages: [SMSMessage]
    public let total: Int
}