import Foundation
import NIMSDK

// MARK: - 网络状态通知
extension Notification.Name {
    static let NIMNetworkStateChanged = Notification.Name("NIMNetworkStateChangedNotification")
    static let NIMTokenExpired = Notification.Name("NIMTokenExpiredNotification")
}

@objc
@objcMembers
final class NIMSessionManager: NSObject {
    
    static let shared = NIMSessionManager()
    
    // MARK: - 登录管理
    func autoLogin(account: String, token: String, completion: @escaping (Error?) -> Void)  {
        NIMSDK.shared().v2LoginService.add(self)
        let data = NIMAutoLoginData()
        data.account = account
        data.token = token
        data.forcedMode = false
        NIMSDK.shared().loginManager.autoLogin(data)
    }
    
    func login(account: String, token: String, completion: @escaping (Error?) -> Void) {
        NIMSDK.shared().loginManager.login(account, token: token) { error in
            if error == nil {
                self.registerObservers()
            }
            completion(error)
        }
    }
    
    func logout() {
        NIMSDK.shared().loginManager.logout { _ in
            self.removeObservers()
        }
    }
    
    // MARK: - 消息监听
    private func registerObservers() {
        // 在 autoLogin 方法中
//        NIMSDK.shared().v2LoginService.add(self as! V2NIMLoginServiceDelegate)
        
        // 在 registerObservers 方法中 
//        NIMSDK.shared().v2LoginService.add(self as! V2NIMLoginServiceDelegate)
        
        // 在 removeObservers 方法中
//        NIMSDK.shared().v2LoginService.remove(self as! V2NIMLoginServiceDelegate)
        NIMSDK.shared().chatManager.add(self)
        NIMSDK.shared().loginManager.add(self)
    }
    
    private func removeObservers() {
        NIMSDK.shared().v2LoginService.remove(self)
        NIMSDK.shared().chatManager.remove(self)
        NIMSDK.shared().loginManager.remove(self)
    }
}

// MARK: - NIMChatManagerDelegate
extension NIMSessionManager: NIMChatManagerDelegate {
    func onRecvMessages(_ messages: [NIMMessage]) {
        NotificationCenter.default.post(
            name: .NIMDidReceiveMessage,
            object: messages
        )
    }
}

// MARK: - NIMLoginManagerDelegate
extension NIMSessionManager: NIMLoginManagerDelegate {
    func onLogin(_ step: NIMLoginStep) {
        NotificationCenter.default.post(
            name: .NIMLoginStateChanged,
            object: step
        )
    }
    
    func onAutoLoginFailed(_ error: Error) {
        if (error as NSError).code == 302 {
            NotificationCenter.default.post(name: .NIMTokenExpired, object: nil)
        }
    }
}

// MARK: - 通知定义
extension Notification.Name {
    static let NIMDidReceiveMessage = Notification.Name("NIMDidReceiveMessageNotification")
    static let NIMLoginStateChanged = Notification.Name("NIMLoginStateChangedNotification")
}

// MARK: - NIMV2LoginServiceDelegate
extension NIMSessionManager: V2NIMLoginListener  {
    func onLoginStatus(_ status: V2NIMLoginStatus) {
        
    }
    
    func onLoginFailed(_ error: V2NIMError) {
        
    }
    
    func onKickedOffline(_ detail: V2NIMKickedOfflineDetail) {
        
    }
    
    func onLoginClientChanged(
        _ change: V2NIMLoginClientChange,
        clients: [V2NIMLoginClient]?
    ) {
        
    }
//    @objc func onLoginProcess(step: NIMV2LoginStep) {
//        NotificationCenter.default.post(
//            name: .NIMV2LoginStateChanged,
//            object: step
//        )
//    }
//    
//    @objc func onKickOut(result: NIMKickOutResult) {
//        NotificationCenter.default.post(
//            name: .NIMKickOutNotification,
//            object: result
//        )
//    }
}