//
//  LessonListViewModel.swift
//  LMS
//
//  Created by Suraj Kumar Mandal on 06/09/22.
//

import Foundation
import Alamofire

class LessonListViewModel {
    
    var delegate: LessonListProtocol?
    
    func getLessonsList(id:Int) {
        if let delegate = delegate {
            delegate.startLoader()
            let accessToken = UserDefaults.standard.value(forKey: "accessToken") as! String

            let url = ApiURL.GetLessonsList
            print(url)
            
            let headers: HTTPHeaders = [
                "Authorization": "Bearer \(accessToken)",
                "Accept": "application/json",
                "Content-Type": "application/json"
            ]
            print(headers)
            
            let parameters: [String: Int] = [
                "lessonId" : id
            ]
            print(parameters)
            
            AF.request(url, 
                       method: .post,
                       parameters: parameters,
                       encoding: JSONEncoding.default,
                       headers: headers)
            .responseJSON { response in
                if response.response?.statusCode == 200 {
                    switch response.result {
                    case .success(_):
                        delegate.stopLoader()
                        guard let jsonData = response.data else {
                            return
                        }
                        let decoder = JSONDecoder()
                        do {
                            let lessonListData = try decoder.decode([LessonListModel].self, from: jsonData)
                            delegate.lessonListModel(model: lessonListData)
                            print(lessonListData.count)
                        } catch {
                            print("getDataList Unexpected error: \(error).")
                            delegate.showError(error: "getDataList Unexpected error: \(error).")
                        }
                        
                        break
                    case .failure(let error):
                        delegate.stopLoader()
                        print(error.localizedDescription)
                        delegate.showError(error: error.localizedDescription)
                        break
                    }
                } else {
                    delegate.stopLoader()
                    print("Server error")
                }
            }
        }
    }

}

protocol LessonListProtocol {
    func startLoader()
    func stopLoader()
    func showError(error:String)
    func lessonListModel(model: [LessonListModel])
}