Tusker/Tusker/Screens/Crash Reporter/IssueReporterViewController.swift

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

import UIKit
import CrashReporter
import MessageUI

protocol IssueReporterViewControllerDelegate: AnyObject {
    func didDismissReporter()
}

class IssueReporterViewController: UIViewController {
    
    static func create(_ self: IssueReporterViewController) -> UINavigationController {
        let nav = UINavigationController(rootViewController: self)
        nav.navigationBar.prefersLargeTitles = true
        return nav
    }
    
    static func create(reportText: String, reportFilename: String? = nil, delegate: IssueReporterViewControllerDelegate) -> UINavigationController {
        let filename = reportFilename ?? "Tusker-error-\(ISO8601DateFormatter().string(from: Date())).txt"
        return create(IssueReporterViewController(reportText: reportText, reportFilename: filename, delegate: delegate))
    }
    
    let reportText: String
    let reportFilename: String
    private weak var delegate: IssueReporterViewControllerDelegate?
    
    var preamble: String {
        "Tusker has encountered an error. You can email a report to the developer. 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 that may be pertinent."
    }
    var subject: String {
        "Tusker Error Report"
    }
    
    @IBOutlet weak var crashReportTextView: UITextView!
    @IBOutlet weak var sendReportButton: UIButton!
    
    init(reportText: String, reportFilename: String, delegate: IssueReporterViewControllerDelegate?) {
        self.reportText = reportText
        self.reportFilename = reportFilename
        self.delegate = delegate
        super.init(nibName: "IssueReporterViewController", bundle: .main)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        
        navigationItem.title = "Report an Error"
        navigationItem.largeTitleDisplayMode = .always
        
        crashReportTextView.font = .monospacedSystemFont(ofSize: 14, weight: .regular)
        
        let attributed = NSMutableAttributedString()
        attributed.append(NSAttributedString(string: preamble, attributes: [
            NSAttributedString.Key.font: UIFont.systemFont(ofSize: 17),
            NSAttributedString.Key.foregroundColor: UIColor.label
        ]))
        attributed.append(NSAttributedString(string: "\n\n"))
        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(subject)
        
        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) {
        delegate?.didDismissReporter()
    }

}

extension IssueReporterViewController: MFMailComposeViewControllerDelegate {
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        controller.dismiss(animated: true) {
            self.delegate?.didDismissReporter()
        }
    }
}