import UIKit
import os.log
import CoreActionSheetPicker

class EventEditViewController: UIViewController, UITextFieldDelegate, UINavigationControllerDelegate {

    //Properties
    var event: Event?
    var viewMode: String?
    var newDate: Date?
    var datePicker = UIDatePicker()
    var startDateTime: Date?


    @IBOutlet weak var startTimeButton: UIButton!
    @IBOutlet weak var startDateButton: UIButton!
    @IBOutlet weak var endTimeButton: UIButton!
    @IBOutlet weak var endDateButton: UIButton!

    @IBOutlet weak var saveButton: UIBarButtonItem!
    @IBOutlet weak var eventNameTextField: UITextField!
    @IBOutlet weak var eventLocationTextField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        eventNameTextField.delegate = self
        eventLocationTextField.delegate = self
        var date = Date()

        formatDateTime(type: "startTime", data: date, exists: false)
        formatDateTime(type: "startDate", data: date, exists: false)
        formatDateTime(type: "endTime", data: date, exists: false)
        formatDateTime(type: "endDate", data: date, exists: false)

        if let event = event {
            navigationItem.title = event.eventName
            eventNameTextField.text = event.eventName
            eventLocationTextField.text = event.eventLocation
        }
        checkValidEventFields()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func formatDateTime(type: String, data: Date, exists: Bool){
        var dateTime = Date()
        let formatter = DateFormatter()

        if(type == "startTime") {
            if (exists == false) {
                formatter.dateFormat = "00:00"
            } else {
                dateTime = data
                formatter.dateFormat = "HH:mm"
            }
            startDateTime = dateTime
            let dateTimeResult = formatter.string(from: dateTime)
            startTimeButton.setTitle(dateTimeResult, for: .normal)

        } else if(type == "startDate") {
            if (exists == false) {
                formatter.dateFormat = "dd/MM/yy"
            } else {
                dateTime = data
                formatter.dateFormat = "dd/MM/yy"
            }
            startDateTime = dateTime
            let dateTimeResult = formatter.string(from: dateTime)
            startDateButton.setTitle(dateTimeResult, for: .normal)
        } else if(type == "endTime") {
            if (exists == false) {
                formatter.dateFormat = "00:00"
            } else {
                dateTime = data
                formatter.dateFormat = "HH:mm"
            }
            let dateTimeResult = formatter.string(from: dateTime)
            endTimeButton.setTitle(dateTimeResult, for: .normal)
        } else if(type == "endDate") {
            if (exists == false) {
                formatter.dateFormat = "dd/MM/yy"
            } else {
                dateTime = data
                formatter.dateFormat = "dd/MM/yy"
            }
            let dateTimeResult = formatter.string(from: dateTime)
            endDateButton.setTitle(dateTimeResult, for: .normal)
        }
    }

    @IBAction func setStartTime(_ sender: UIButton) {
        let datePicker = ActionSheetDatePicker(title: "Set Start Time:", datePickerMode: UIDatePickerMode.time, selectedDate: Date(), target: self, action: #selector(self.donePickerStartTime), origin: sender.superview!.superview)!

        datePicker.minuteInterval = 20

        datePicker.show()
    }

    @IBAction func setStartDate(_ sender: UIButton) {
        let datePicker = ActionSheetDatePicker(title: "Set Start Date:", datePickerMode: UIDatePickerMode.date, selectedDate: Date(), target: self, action: #selector(self.donePickerStartDate), origin: sender.superview!.superview)!

        datePicker.minuteInterval = 20

        datePicker.show()
    }

    @IBAction func setEndTime(_ sender: UIButton) {
        let datePicker = ActionSheetDatePicker(title: "Set End Time:", datePickerMode: UIDatePickerMode.time, selectedDate: Date(), target: self, action: #selector(self.donePickerEndDate), origin: sender.superview!.superview)!

        datePicker.minuteInterval = 20

        datePicker.show()
    }

    @IBAction func setEndDate(_ sender: UIButton) {
        let datePicker = ActionSheetDatePicker(title: "Set End Date:", datePickerMode: UIDatePickerMode.date, selectedDate: Date(), target: self, action: #selector(self.donePickerEndDate), origin: sender.superview!.superview)!

        datePicker.minuteInterval = 20

        datePicker.show()
    }

    func donePickerStartTime(datePicked: Date){
        formatDateTime(type: "startTime", data: datePicked, exists: true)
        self.view.endEditing(true)
    }

    func donePickerStartDate(datePicked: Date){
        formatDateTime(type: "startDate", data: datePicked, exists: true)
        self.view.endEditing(true)
    }

    func donePickerEndTime(datePicked: Date){
        formatDateTime(type: "endTime", data: datePicked, exists: true)
        self.view.endEditing(true)
    }

    func donePickerEndDate(datePicked: Date){
        formatDateTime(type: "endDate", data: datePicked, exists: true)
        self.view.endEditing(true)
    }

    func checkValidEventFields() {
        let eventNameText = eventNameTextField.text ?? ""
        let eventLocationText = eventLocationTextField.text ?? ""

        saveButton.isEnabled = !eventNameText.isEmpty

        //|| !eventStartDateText.isEmpty || !eventLocationText.isEmpty
    }

    //Text field
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }

    func textFieldDidEndEditing(_ textField: UITextField) {
        if (textField == eventNameTextField) {
            checkValidEventFields()
            navigationItem.title = eventNameTextField.text
        }
    }

    func textFieldDidBeginEditing(_ textField: UITextField) {
        //Disable the Save button whilst editing
    }


    // MARK: - Navigation

    @IBAction func cancel(_ sender: UIBarButtonItem) {
        let isPresentingInAddEventMode = presentingViewController is UINavigationController

        if isPresentingInAddEventMode {
            dismiss(animated: true, completion: nil)
        }
        else if let owningNavigationController = navigationController{
            owningNavigationController.popViewController(animated: true)
        }
        else {
            fatalError("The EventViewController is not inside a navigation controller.")
        }
    }

    @IBAction func saveEvent(_ sender: Any) {
        if (event == nil) {
            print("null")
        }
        else {
            print("not null")
        }

        print(startDateTime)

        let eventID = detectEventID()
        let eventName = eventNameTextField.text ?? ""
        let eventLocation = eventLocationTextField.text ?? ""
        let eventStartDate = ""
        let retrievedToken:String = KeychainWrapper.standard.string(forKey: "webToken")!

        if (eventName.isEmpty || eventStartDate.isEmpty || eventLocation.isEmpty) {
            displayAlert(alertTitle: "Empty fields", alertMessage: "Please fill in all event details")
            return
        }
        else {
            HTTPRequest.createEventRequest(eventID: eventID, eventName: eventName, eventStartDate: eventStartDate, eventLocation: eventLocation, token: retrievedToken, callback: completeEventCreation)
        }

    }

    func detectEventID() -> String {
        if (viewMode == "createEvent") {
            var e = Event(
                eventID: UUID().uuidString,
                eventName: "",
                eventStartDate: "",
                eventLocation: ""
            )

            self.event = e
        } else if (viewMode == "showEvent") {
            print(event!.eventID)
        }
        return event!.eventID
    }


    func completeEventCreation(result: Dictionary<String, String>) -> Void {

        let isEventAdded = (result["status"]! == "Success")
        let statusMessage:String = result["message"]!

        if (isEventAdded) {
            print("Event Added")
        } else {
            DispatchQueue.main.async(execute: {
                //display alert message with confirmation
                self.displayAlert(alertTitle: "Alert", alertMessage: statusMessage)
            })
        }
    }


    func displayAlert(alertTitle: String, alertMessage: String) {
        let alertController = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: .alert)

        let OKAction = UIAlertAction(title: "OK", style: .default) { (action) in }
        alertController.addAction(OKAction)

        present(alertController, animated: true, completion: nil)
    }

}