Tusker/Tusker/Screens/Crash Reporter/CrashReporterViewController.swift

//
//  CrashReporterViewController.swift
//  Tusker
//
//  Created by Shadowfacts on 6/20/20.
//  Copyright © 2020 Shadowfacts. All rights reserved.
//

import UIKit
import CrashReporter
import MessageUI

class CrashReporterViewController: UIViewController {

    private let report: PLCrashReport
    private var reportText: String!
    
    private var reportFilename: String {
        let timestamp = ISO8601DateFormatter().string(from: report.systemInfo.timestamp)
        return "Tusker-crash-\(timestamp).crash"
    }
    
    @IBOutlet weak var crashReportTextView: UITextView!
    @IBOutlet weak var sendReportButton: UIButton!
    
    static func create(report: PLCrashReport) -> UINavigationController {
        let nav = UINavigationController(rootViewController: CrashReporterViewController(report: report))
        nav.navigationBar.prefersLargeTitles = true
        return nav
    }
    
    private init(report: PLCrashReport){
        self.report = report
        
        super.init(nibName: "CrashReporterViewController", bundle: .main)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        
        navigationItem.title = NSLocalizedString("Crash Detected", comment: "crash reporter title")
        navigationItem.largeTitleDisplayMode = .always
        
        crashReportTextView.font = .monospacedSystemFont(ofSize: 14, weight: .regular)
        
        reportText = PLCrashReportTextFormatter.stringValue(for: report, with: PLCrashReportTextFormatiOS)!
        let info = "Tusker has detected that it crashed the last time it was running. You can email the report to the developer or skip sending and continue to the app. You may review the report below before sending.\n\nIf you choose to send the report, please include any additional details about what you were doing prior to the crash that may be pertinent.\n\n"
        let attributed = NSMutableAttributedString()
        attributed.append(NSAttributedString(string: info, attributes: [
            NSAttributedString.Key.font: UIFont.systemFont(ofSize: 17),
            NSAttributedString.Key.foregroundColor: UIColor.label
        ]))
        attributed.append(NSAttributedString(string: reportText, attributes: [
            NSAttributedString.Key.font: UIFont.monospacedSystemFont(ofSize: 14, weight: .regular),
            NSAttributedString.Key.foregroundColor: UIColor.label
        ]))
        crashReportTextView.attributedText = attributed
        
        sendReportButton.layer.cornerRadius = 12.5
        sendReportButton.layer.masksToBounds = true
        
        sendReportButton.addGestureRecognizer(UILongPressGestureRecognizer(target: self, action: #selector(sendReportButtonLongPressed)))
    }
    
    private func updateSendReportButtonColor(lightened: Bool, animate: Bool) {
        let color: UIColor
        if lightened {
            var hue: CGFloat = 0, saturation: CGFloat = 0, brightness: CGFloat = 0, alpha: CGFloat = 0
            UIColor.systemBlue.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: &alpha)
            color = UIColor(hue: hue, saturation: 0.85 * saturation, brightness: brightness, alpha: alpha)
        } else {
            color = .systemBlue
        }
        if animate {
            UIView.animate(withDuration: 0.25) {
                self.sendReportButton.backgroundColor = color
            }
        } else {
            sendReportButton.backgroundColor = color
        }
    }
    
    @IBAction func sendReportTouchDown(_ sender: Any) {
        updateSendReportButtonColor(lightened: true, animate: false)
    }
    
    @IBAction func sendReportButtonTouchDragExit(_ sender: Any) {
        updateSendReportButtonColor(lightened: false, animate: true)
    }
    
    @IBAction func sendReportButtonTouchDragEnter(_ sender: Any) {
        updateSendReportButtonColor(lightened: true, animate: true)
    }
    
    @IBAction func sendReportTouchUpInside(_ sender: Any) {
        updateSendReportButtonColor(lightened: false, animate: true)
        
        let composeVC = MFMailComposeViewController()
        composeVC.mailComposeDelegate = self
        composeVC.setToRecipients(["me@shadowfacts.net"])
        composeVC.setSubject("Tusker Crash Report")
        
        let data = reportText.data(using: .utf8)!
        composeVC.addAttachmentData(data, mimeType: "text/plain", fileName: reportFilename)
        
        self.present(composeVC, animated: true)
    }
    
    @objc func sendReportButtonLongPressed() {
        let dir = FileManager.default.temporaryDirectory
        let url = dir.appendingPathComponent(reportFilename)
        try! reportText.data(using: .utf8)!.write(to: url)
        let activityController = UIActivityViewController(activityItems: [url], applicationActivities: nil)
        present(activityController, animated: true)
    }

    @IBAction func cancelPressed(_ sender: Any) {
        (view.window!.windowScene!.delegate as! SceneDelegate).showAppOrOnboardingUI()
    }

}

extension CrashReporterViewController: MFMailComposeViewControllerDelegate {
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        controller.dismiss(animated: true) {
            (self.view.window!.windowScene!.delegate as! SceneDelegate).showAppOrOnboardingUI()
        }
    }
}