//
//  NearbySession.swift
//  nearby_service
//
//  Created by Kseniia Nikitina on 16/1/24.
//

import Foundation
import MultipeerConnectivity

class NearbySession: NSObject {
    var session: MCSession!
    var state: MCSessionState = MCSessionState.notConnected

    private init(peerID: MCPeerID) {
        self.session = MCSession(peer: peerID)
    }
    
    static func create(peerID: MCPeerID) -> NearbySession {
        let instance = NearbySession(peerID: peerID)
        instance.session.delegate = instance
        return instance
    }
}


extension NearbySession: MCSessionDelegate {
    func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState) {
        self.state = state
    }
    
    func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) {

        NotificationCenter.default.post(
            name: ON_MESSAGE_RECEIVED,
            object: nil,
            userInfo: NearbyUserInfo.message(peerID: peerID, data: data)?.toDictionary()
        )
    }
    
    func session(_ session: MCSession, didReceive stream: InputStream, withName streamName: String, fromPeer peerID: MCPeerID) {}
    
    func session(_ session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, with progress: Progress) {

    }
    
    func session(_ session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL?, withError error: Error?) {
        guard let localURL = localURL else { return }

        var destinationURL = localURL.deletingLastPathComponent().appendingPathComponent("\(resourceName)")
        
        if FileManager.default.fileExists(atPath: destinationURL.path) {
            destinationURL = localURL.deletingLastPathComponent().appendingPathComponent("New_\(resourceName)")
        }

        do {
            try FileManager.default.moveItem(at: localURL, to: destinationURL)
        } catch {
            Logger.error(message: "Error moving file: \(error)")
        }
        NotificationCenter.default.post(
            name: ON_RESOURCE_RECEIVED,
            object: nil,
            userInfo: NearbyUserInfo.resource(peerID: peerID, url: destinationURL)?.toDictionary()
        )
    }
}