import Foundation
import Network
import UIKit

class NetworkService: ObservableObject {
    @Published var isConnected = false
    @Published var connectionStatus = "Disconnected"

    private var connection: NWConnection?
    private let queue = DispatchQueue(label: "NetworkService")

    // Configuration
    private let defaultHost = "192.168.1.100" // Change to your Pi's IP
    private let defaultPort: UInt16 = 8080

    func connect(host: String = "", port: UInt16 = 0) {
        let targetHost = host.isEmpty ? defaultHost : host
        let targetPort = port == 0 ? defaultPort : port

        connection = NWConnection(
            host: NWEndpoint.Host(targetHost),
            port: NWEndpoint.Port(integerLiteral: targetPort),
            using: .tcp
        )

        connection?.stateUpdateHandler = { [weak self] state in
            DispatchQueue.main.async {
                switch state {
                case .ready:
                    self?.isConnected = true
                    self?.connectionStatus = "Connected to \(targetHost):\(targetPort)"
                case .failed(let error):
                    self?.isConnected = false
                    self?.connectionStatus = "Failed: \(error.localizedDescription)"
                case .cancelled:
                    self?.isConnected = false
                    self?.connectionStatus = "Connection cancelled"
                default:
                    self?.isConnected = false
                    self?.connectionStatus = "Connecting..."
                }
            }
        }

        connection?.start(queue: queue)
    }

    func disconnect() {
        connection?.cancel()
        connection = nil
        isConnected = false
        connectionStatus = "Disconnected"
    }

    func sendCommand(_ command: LauncherCommand) {
        guard let connection = connection, isConnected else {
            print("No connection available")
            return
        }

        do {
            let data = try JSONEncoder().encode(command)
            connection.send(content: data, completion: .contentProcessed { error in
                if let error = error {
                    print("Send error: \(error)")
                }
            })
        } catch {
            print("Encoding error: \(error)")
        }
    }

    func requestPhoto(completion: @escaping (UIImage?) -> Void) {
        guard let connection = connection, isConnected else {
            completion(nil)
            return
        }

        connection.receive(minimumIncompleteLength: 1, maximumLength: 1024*1024) { data, _, isComplete, error in
            if let data = data, !data.isEmpty {
                let image = UIImage(data: data)
                completion(image)
            } else {
                completion(nil)
            }
        }
    }

    func startVideoStream(onFrame: @escaping (UIImage?) -> Void) {
        guard let connection = connection, isConnected else {
            return
        }

        let command = LauncherCommand.startVideoStream()
        sendCommand(command)

        // Continuously receive video frames
        func receiveFrame() {
            connection.receive(minimumIncompleteLength: 1, maximumLength: 1024*1024) { data, _, isComplete, error in
                if let data = data, !data.isEmpty {
                    let image = UIImage(data: data)
                    DispatchQueue.main.async {
                        onFrame(image)
                    }
                    // Continue receiving frames
                    receiveFrame()
                }
            }
        }
        receiveFrame()
    }

    func stopVideoStream() {
        let command = LauncherCommand.stopVideoStream()
        sendCommand(command)
    }
}

struct LauncherCommand: Codable {
    let action: String
    let angle: Double?
    let mode: String?
    let timestamp: Date

    init(action: String, angle: Double? = nil, mode: String? = nil) {
        self.action = action
        self.angle = angle
        self.mode = mode
        self.timestamp = Date()
    }
}

// Predefined commands
extension LauncherCommand {
    static func aimLeft() -> LauncherCommand {
        LauncherCommand(action: "aim_left")
    }

    static func aimRight() -> LauncherCommand {
        LauncherCommand(action: "aim_right")
    }

    static func fire(angle: Double) -> LauncherCommand {
        LauncherCommand(action: "fire", angle: angle)
    }

    static func home() -> LauncherCommand {
        LauncherCommand(action: "home")
    }

    static func setMode(_ mode: String) -> LauncherCommand {
        LauncherCommand(action: "set_mode", mode: mode)
    }

    static func capturePhoto() -> LauncherCommand {
        LauncherCommand(action: "capture_photo")
    }

    static func startVideoStream() -> LauncherCommand {
        LauncherCommand(action: "start_video_stream")
    }

    static func stopVideoStream() -> LauncherCommand {
        LauncherCommand(action: "stop_video_stream")
    }

    static func stop() -> LauncherCommand {
        LauncherCommand(action: "stop")
    }

    static func status() -> LauncherCommand {
        LauncherCommand(action: "status")
    }
}