//
//  FirstViewController.swift
//  AvH Plan
//
//  Created by Deniz Duezgoeren on 25.05.19.
//  Copyright © 2019 Deniz Duezgoeren. All rights reserved.
//

import UIKit
import MagazineLayout
import Crashlytics
import Firebase

class PlanViewController : UIViewController, UICollectionViewDataSource, UICollectionViewDelegateMagazineLayout {
    
    let identifier = "plan_cell"
    var substs = [SubstModel]()
    let refreshControl = UIRefreshControl()
    let df = DataFetcher.sharedInstance
    let planPrefs = UserDefaults.standard
    let layout = MagazineLayout()
    var collectionView: UICollectionView
    var url = ""
    var indexOfPSA: Int? = nil
    
    required init?(coder decoder: NSCoder) {
        collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
        super.init(coder: decoder)
    }
    
    func getToolbarBottomAnchor() -> NSLayoutYAxisAnchor {
        return view.topAnchor
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        Messaging.messaging().subscribe(toTopic: "substitutions-ios")
        Messaging.messaging().subscribe(toTopic: "substitutions-broadcast")
        Crashlytics.sharedInstance().setUserIdentifier(UserDefaults.standard.string(forKey: "username"))
        
        view.addSubview(collectionView)
        collectionView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            collectionView.topAnchor.constraint(equalTo: view.topAnchor),
            collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
            ])
        collectionView.register(UINib(nibName: "PlanViewCell", bundle: nil), forCellWithReuseIdentifier: identifier)
        collectionView.dataSource = self
        collectionView.delegate = self
        collectionView.backgroundColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
        
        if #available(iOS 10.0, *) {
            collectionView.refreshControl = refreshControl
        } else {
            collectionView.addSubview(refreshControl)
        }
        refreshControl.addTarget(self, action: #selector(objDoAsync(_:)), for: .valueChanged)
        refreshControl.tintColor = #colorLiteral(red: 0.07843137255, green: 0.5568627451, blue: 1, alpha: 1)
        refreshControl.attributedTitle = NSAttributedString(string: getRefreshViewString())
        
        self.substs = getFromDatabase()
        self.collectionView.reloadData()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        if let tabItems = self.tabBarController?.tabBar.items {
            let tabItem = tabItems[1]
            if self.planPrefs.integer(forKey: "personalPlanCount") != 0 {
                tabItem.badgeValue = "\(self.planPrefs.integer(forKey: "personalPlanCount"))"
            } else {
                tabItem.badgeValue = nil
            }
        }
    }
    
    func getViewType() -> String {
        return "plan"
    }
    
    func getFromDatabase() -> [SubstModel] {
        return self.df.getFromDatabase()
    }
    
    func getRefreshViewString() -> String {
        return NSLocalizedString("fetch_plan", comment: "")
    }
    
    @objc private func objDoAsync(_ sender: Any) {
        self.df.doAsync(do: self.getViewType()) { substitutions in
            self.substs = substitutions as! [SubstModel]
            self.collectionView.reloadData()
            self.refreshControl.endRefreshing()
            if let tabItems = self.tabBarController?.tabBar.items {
                let tabItem = tabItems[1]
                if self.planPrefs.integer(forKey: "personalPlanCount") != 0 {
                    tabItem.badgeValue = "\(self.planPrefs.integer(forKey: "personalPlanCount"))"
                } else {
                    tabItem.badgeValue = nil
                }
            }
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.substs.count
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        if indexOfPSA == indexPath.item {
            UIApplication.shared.open(URL(string: url)!)
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifier, for: indexPath as IndexPath) as! PlanViewCell
        
        var psa = false
        
        let course = self.substs[indexPath.item].course
        var image = df.getImage(from: course)
        
        let layer = cell.tintView.layer
        layer.cornerRadius = 12.0
        layer.shadowColor = UIColor.gray.cgColor
        layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
        layer.shadowRadius = 1.5
        layer.shadowOpacity = 0.7
        cell.tintView.backgroundColor = self.df.getColour(for: course)
        
        let dateString = self.substs[indexPath.item].date
        if dateString.count > 2 && dateString[dateString.startIndex...dateString.index(dateString.startIndex, offsetBy: 2)] == "psa" {
            cell.date.text = ""
            if dateString.count > 9 && dateString[dateString.index(dateString.startIndex, offsetBy: 3)...dateString.index(dateString.startIndex, offsetBy: 6)] == "http" {
                url = "\(dateString[dateString.index(dateString.startIndex, offsetBy: 3)...])"
                indexOfPSA = indexPath.item
            }
            image = UIImage(named: "ic_idea_w")
            cell.tintView.backgroundColor = #colorLiteral(red: 0, green: 0.4784313725, blue: 1, alpha: 1)
            cell.group.textColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
            cell.course.textColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
            cell.additional.textColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
            psa = true
        } else {
            cell.date.text = self.substs[indexPath.item].date
            cell.group.textColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
            cell.course.textColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
            cell.additional.textColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
        }
        
        let mutableStrings = [NSMutableAttributedString(string: self.substs[indexPath.item].group), NSMutableAttributedString(string: self.substs[indexPath.item].time), NSMutableAttributedString(string: self.substs[indexPath.item].course), NSMutableAttributedString(string: self.substs[indexPath.item].room)]
        let strings = [self.substs[indexPath.item].group, self.substs[indexPath.item].time, self.substs[indexPath.item].course, self.substs[indexPath.item].room]
        
        for i in 0..<4 {
            if let qmark = strings[i].firstIndex(of: "?") {
                let distance = strings[i].distance(from: strings[i].startIndex, to: qmark)
                mutableStrings[i].addAttribute(NSAttributedString.Key.strikethroughStyle, value: 2, range: NSMakeRange(0, distance))
            }
        }
        
        let add = self.substs[indexPath.item].additional.lowercased()
        if add.contains("eigenverantwortliches arbeiten") || add.contains("entfall") || add.contains("fällt aus"){
            mutableStrings[2].addAttribute(NSAttributedString.Key.strikethroughStyle, value: 2, range: NSMakeRange(0, mutableStrings[2].length))
            mutableStrings[3].addAttribute(NSAttributedString.Key.strikethroughStyle, value: 2, range: NSMakeRange(0, mutableStrings[3].length))
        }
        
        cell.group.attributedText = mutableStrings[0]
        cell.additional.text = self.substs[indexPath.item].additional
        cell.time.attributedText = mutableStrings[1]
        cell.room.attributedText = mutableStrings[3]
        
        if image != nil {
            let attachment: NSTextAttachment = NSTextAttachment()
            if indexOfPSA == indexPath.item {
                attachment.bounds = CGRect(x: 0, y: 0, width: 11, height: 16)
            } else {
                attachment.bounds = CGRect(x: 0, y: 0, width: 16, height: 16)
            }
            attachment.image = image
            
            let courseImage = NSMutableAttributedString(string: "")
            courseImage.append(NSAttributedString(attachment: attachment))
            courseImage.append(NSAttributedString(string: " "))
            let courseString = mutableStrings[2]
            courseImage.append(courseString)
            if psa == true {
                courseImage.addAttribute(NSAttributedString.Key.foregroundColor, value: #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0), range: NSMakeRange(0, 3))
            }
            
            cell.course.attributedText = courseImage
        } else {
            cell.course.attributedText = mutableStrings[2]
        }
        
        return cell
    }
    
    // stubs
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeModeForItemAt indexPath: IndexPath) -> MagazineLayoutItemSizeMode {
        var widthMode: MagazineLayoutItemWidthMode
        if UIDevice.current.userInterfaceIdiom == .pad { // iPad
            if UIDevice.current.orientation.isLandscape {
                widthMode = MagazineLayoutItemWidthMode.thirdWidth
            } else {
                widthMode = MagazineLayoutItemWidthMode.halfWidth
            }
        } else { // iPhone
            if UIDevice.current.orientation.isLandscape {
                widthMode = MagazineLayoutItemWidthMode.halfWidth
            } else {
                widthMode = MagazineLayoutItemWidthMode.fullWidth(respectsHorizontalInsets: true)
            }
        }
        let heightMode = MagazineLayoutItemHeightMode.dynamic
        return MagazineLayoutItemSizeMode(widthMode: widthMode, heightMode: heightMode)
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, visibilityModeForHeaderInSectionAtIndex index: Int) -> MagazineLayoutHeaderVisibilityMode {
        return .hidden
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, visibilityModeForFooterInSectionAtIndex index: Int) -> MagazineLayoutFooterVisibilityMode {
        return .hidden
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, visibilityModeForBackgroundInSectionAtIndex index: Int) -> MagazineLayoutBackgroundVisibilityMode {
        return .hidden
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, horizontalSpacingForItemsInSectionAtIndex index: Int) -> CGFloat {
        return 0
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, verticalSpacingForElementsInSectionAtIndex index: Int) -> CGFloat {
        return 0 // change this if needed
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetsForSectionAtIndex index: Int) -> UIEdgeInsets {
        return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetsForItemsInSectionAtIndex index: Int) -> UIEdgeInsets {
        return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
    }
}