//
//  CalendarViewController.swift
//  KIPU
//
//  Created by Elvis on 4/22/18.
//  Copyright © 2018 Elvis. All rights reserved.
//

import UIKit
import VACalendar

public var oneDayTimeInterval: TimeInterval = 86400

class CalendarViewController: BaseViewController {

    @IBOutlet weak var tableView: UITableView!
    @IBOutlet var tableHeaderView: UIView!
    @IBOutlet weak var calendarContainerView: UIView!

    @IBOutlet weak var monthHeaderView: VAMonthHeaderView! {
        didSet {
        }
    }

    @IBOutlet weak var weekDaysView: VAWeekDaysView! {
        didSet {
            let appereance = VAWeekDaysViewAppearance(symbolsType: .veryShort, calendar: defaultCalendar)
            weekDaysView.appearance = appereance
        }
    }

    let defaultCalendar: Calendar = {
        var calendar = Calendar.current
        calendar.firstWeekday = 1
        calendar.timeZone = TimeZone(secondsFromGMT: 0)!
        return calendar
    }()

    var calendarView: VACalendarView!

    let cellIdentifier = "cellIdentifier"

    var viewModel = CalendarViewControllerVM()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        self.title = "Календарь"

        self.tableView.register(EventCell.className, forCellReuseIdentifier: self.cellIdentifier)

        self.viewModel.requestEvents()
        self.setupCalendar()

        self.tableView.tableHeaderView = self.tableHeaderView
        self.tableView.rowHeight = UITableViewAutomaticDimension
        self.tableView.estimatedRowHeight = 100

        self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(createEvent))

    }

    @objc func createEvent() {
        let vc = CreateEventViewController()
        vc.hidesBottomBarWhenPushed = true
        self.navigationController?.pushViewController(vc, animated: true)
    }

    private func setupCalendar() {
        var frame = self.calendarContainerView.frame
        frame.origin = .zero

        let calendar = VACalendar(calendar: self.defaultCalendar)
        self.calendarView = VACalendarView(frame: frame, calendar: calendar)
        self.calendarContainerView.addSubview(self.calendarView)

        self.calendarView.showDaysOut = true
        self.calendarView.selectionStyle = .single
        self.calendarView.monthDelegate = monthHeaderView
        self.calendarView.dayViewAppearanceDelegate = self
        self.calendarView.monthViewAppearanceDelegate = self
        self.calendarView.calendarDelegate = self
        self.calendarView.scrollDirection = .horizontal
        self.calendarView.setup()

        var ed: [(Date, [VADaySupplementary])] = []
        for date in self.viewModel.eventsDate {
            ed.append((date, [VADaySupplementary.bottomDots([.red])]))
        }
        self.calendarView.setSupplementaries(ed)
    }
}

extension CalendarViewController: UITableViewDataSource {
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.viewModel.events.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: self.cellIdentifier) as! EventCell
        cell.setup(self.viewModel.events[indexPath.row])
        return cell
    }
}

extension CalendarViewController: UITableViewDelegate {
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        let vm = self.viewModel.events[indexPath.row]
        let vc = NewsDetailsViewController(eventVM: vm)
        vc.hidesBottomBarWhenPushed = true
        self.navigationController?.pushViewController(vc, animated: true)
    }
}

extension CalendarViewController: VAMonthViewAppearanceDelegate {

    func leftInset() -> CGFloat {
        return 10.0
    }

    func rightInset() -> CGFloat {
        return 10.0
    }

    func verticalMonthTitleFont() -> UIFont {
        return UIFont.systemFont(ofSize: 16, weight: .semibold)
    }

    func verticalMonthTitleColor() -> UIColor {
        return .black
    }

    func verticalCurrentMonthTitleColor() -> UIColor {
        return .red
    }

}

extension CalendarViewController: VADayViewAppearanceDelegate {

    func textColor(for state: VADayState) -> UIColor {
        switch state {
        case .out:
            return UIColor(red: 214 / 255, green: 214 / 255, blue: 219 / 255, alpha: 1.0)
        case .selected:
            return .white
        case .unavailable:
            return .lightGray
        default:
            return .black
        }
    }

    func textBackgroundColor(for state: VADayState) -> UIColor {
        switch state {
        case .selected:
            return .red
        default:
            return .clear
        }
    }

    func shape() -> VADayShape {
        return .circle
    }

    func dotBottomVerticalOffset(for state: VADayState) -> CGFloat {
        switch state {
        case .selected:
            return 2
        default:
            return -7
        }
    }

}

extension CalendarViewController: VACalendarViewDelegate {

    func selectedDate(_ date: Date) {
        self.navigationController?.pushViewController(CalendarDetailsViewController(events: self.selectedEvents(date)), animated: true)
        self.calendarView.selectDates([Date()])
    }


    private func selectedEvents(_ date: Date) -> [EventCellVM] {


        return self.viewModel.events.filter {
            return date.compare(Date(timeIntervalSince1970: $0.model.startDate))
        }
    }
}