//
//  DetailedView.swift
//  Dashy
//
//  Created by Георгий Александров on 15.04.2020.
//  Copyright © 2020 Георгий Александров. All rights reserved.
//

import EventKit
import SwiftUI

struct DetailedView: View {
    @State private var showShareSheet = false
    @State var calendarShow = false
    func addEventToCalendar(title: String, description: String?, startDate: Date, endDate _: Date, completion: ((_ success: Bool, _ error: NSError?) -> Void)? = nil) {
        let eventStore = EKEventStore()
        eventStore.requestAccess(to: .event, completion: { granted, error in
            if granted, error == nil {
                let event = EKEvent(eventStore: eventStore)
                event.title = title
                event.startDate = startDate
                event.endDate = startDate
                event.notes = description
                event.calendar = eventStore.defaultCalendarForNewEvents
                do {
                    try eventStore.save(event, span: .thisEvent)

                } catch let e as NSError {
                    completion?(false, e)
                    return
                }
                self.calendarShow = true
                completion?(true, nil)
            } else {
                completion?(false, error as NSError?)
            }
        })
    }

    @State var daysCount: String = ""
    var task: Task = Task(title: "Раз два три четыре пять шесть", description: "", classs: [:], materials: "", id: 1, deadline: "", class_pid: "", public_id: "")
    var body: some View {
        ScrollView {
            VStack {
                HStack {
                    Text(task.title).font(.system(size: 37, weight: .semibold)).padding(.trailing).lineLimit(100).fixedSize(horizontal: false, vertical: true)
                    Spacer()
                    Image(systemName: "square.and.arrow.up").onTapGesture {
                        self.showShareSheet = true
                    }
                }.padding()
                HStack {
                    Text(task.description).font(.system(size: 24, weight: .medium)).fixedSize(horizontal: false, vertical: true)
                    Spacer()
                }.padding(.horizontal)
                HStack {
                    Text(self.daysCount).font(.system(size: 18, weight: .regular)).onAppear(perform: {
                        let dateFormatter = DateFormatter()
                        dateFormatter.dateFormat = "dd-MM-yyyy"
                        let date = dateFormatter.date(from: self.task.deadline)
                        self.daysCount = getDateObservation(date: date!)
                    })
                    Spacer()
                }.padding(.horizontal)
                Divider().padding()

                HStack {
                    Text("Дедлайн").font(.system(size: 24, weight: .medium))
                    Spacer()
                    Image(systemName: "calendar.badge.plus").offset(x: 0, y: 10).onTapGesture {
                        let dateFormatter = DateFormatter()
                        dateFormatter.dateFormat = "dd-MM-yyyy"
                        let date = dateFormatter.date(from: self.task.deadline)
                        self.addEventToCalendar(title: self.task.title, description: self.task.description, startDate: date!, endDate: date!)
                    }.alert(isPresented: $calendarShow, content: {
                        Alert(title: Text("Добавлено в календарь"), message: Text("Задание «\(self.task.title)» успешно добавлено в календарь"), dismissButton: .default(Text("ОК")))
                    })
                }.padding(.horizontal)
                HStack {
                    Text(task.deadline).font(.system(size: 18, weight: .regular))
                    Spacer()
                }.padding(.horizontal)
                Divider().padding()
                HStack {
                    Text("Материалы к уроку").font(.system(size: 24, weight: .medium))
                    Spacer()
                }.padding(.horizontal)
                HStack {
                    Text(task.materials).font(.system(size: 18, weight: .regular)).fixedSize(horizontal: false, vertical: true)
                    Spacer()
                }.padding(.horizontal)
                    .sheet(isPresented: $showShareSheet) {
                        ShareSheet(activityItems: ["Задание «\(self.task.title)» \nПосмотреть на Dashy: alxndrv.pythonanywhere.com/task/\(self.task.public_id)"])
                    }

                Spacer()
                    .edgesIgnoringSafeArea(.all)
            }
            Spacer()
        }
    }
}

struct DetailedView_Previews: PreviewProvider {
    static var previews: some View {
        DetailedView().previewDevice("iPhone 11")
    }
}