import Foundation

// ─────────────────────────────────────────────────────────────
// Cross-Device Communication Protocol
// ─────────────────────────────────────────────────────────────

/// Device node in the cluster
public struct DeviceNode: Codable, Sendable {
    public let id: String
    public let host: String
    public let port: Int
    public let capabilities: DeviceCapabilities
    public var status: DeviceStatus
    public var load: Double // 0.0 to 1.0
    
    public init(
        id: String,
        host: String,
        port: Int,
        capabilities: DeviceCapabilities,
        status: DeviceStatus = .healthy,
        load: Double = 0.0
    ) {
        self.id = id
        self.host = host
        self.port = port
        self.capabilities = capabilities
        self.status = status
        self.load = load
    }
    
    public var baseURL: String {
        "http://\(host):\(port)"
    }
}

/// Device capabilities
public struct DeviceCapabilities: Codable, Sendable {
    public let maxConcurrency: Int
    public let supportedModels: [String]
    public let hasGPU: Bool
    public let memoryGB: Int
    
    public init(
        maxConcurrency: Int = 4,
        supportedModels: [String] = [],
        hasGPU: Bool = true,
        memoryGB: Int = 16
    ) {
        self.maxConcurrency = maxConcurrency
        self.supportedModels = supportedModels
        self.hasGPU = hasGPU
        self.memoryGB = memoryGB
    }
}

/// Device status
public enum DeviceStatus: String, Codable, Sendable {
    case healthy
    case degraded
    case unhealthy
    case offline
}

/// Cross-device request
public struct CrossDeviceRequest: Codable, Sendable {
    public let id: String
    public let endpoint: String
    public let method: String
    public let body: Data?
    public let timeout: TimeInterval
    
    public init(
        id: String = UUID().uuidString,
        endpoint: String,
        method: String = "POST",
        body: Data? = nil,
        timeout: TimeInterval = 30
    ) {
        self.id = id
        self.endpoint = endpoint
        self.method = method
        self.body = body
        self.timeout = timeout
    }
}

/// Cross-device response
public struct CrossDeviceResponse: Codable, Sendable {
    public let requestId: String
    public let statusCode: Int
    public let body: Data?
    public let latency: TimeInterval
    public let nodeId: String
    
    public init(
        requestId: String,
        statusCode: Int,
        body: Data? = nil,
        latency: TimeInterval,
        nodeId: String
    ) {
        self.requestId = requestId
        self.statusCode = statusCode
        self.body = body
        self.latency = latency
        self.nodeId = nodeId
    }
}