//
//  ComposeViewController.swift
//  elpha-ios
//
//  Created by Dwayne Harris on 11/12/18.
//  Copyright © 2018 Elpha. All rights reserved.
//

import Kingfisher
import UIKit

class ComposeViewController: UIViewController {
    @IBOutlet var replyToView: UIView!
    @IBOutlet var replyToAvatarImageView: UIImageView!
    @IBOutlet var replyToDisplayNameLabel: UILabel!
    @IBOutlet var replyToUsernameLabel: UILabel!
    @IBOutlet var replyToContentTextView: UITextViewFixed!
    @IBOutlet var statusTextView: UITextView!
    @IBOutlet var statusCharacterCountLabel: UILabel!
    @IBOutlet var contentWarningTextField: UITextField!
    @IBOutlet var bottomConstraint: NSLayoutConstraint!
    
    let characterLimit = 500
    let composeAccessoryViewHeight: CGFloat = 55.0
    var feedbackGenerator: UINotificationFeedbackGenerator?
    var replyToStatus: StatusMO?
    var composeAccessoryView: ComposeAccessoryView?
    var selectedVisibility: StatusVisibility = .public
    
    var attachmentInputView: AttachmentInputView?
    var visibilityInputView: VisibilityInputView?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        feedbackGenerator = UINotificationFeedbackGenerator()
        
        statusTextView.layer.cornerRadius = 10
        statusTextView.layer.masksToBounds = true
        statusTextView.textContainerInset = UIEdgeInsets(top: 10, left: 5, bottom: 10, right: 5)
        
        replyToAvatarImageView.setRoundedCorners()
        
        composeAccessoryView = ComposeAccessoryView(frame: CGRect(x: 0, y: 0, width: self.view.bounds.size.width, height: composeAccessoryViewHeight))
        composeAccessoryView!.delegate = self
        composeAccessoryView!.selectedVisibility = selectedVisibility
        
        visibilityInputView = VisibilityInputView(frame: CGRect(x: 0, y: 0, width: self.view.bounds.size.width, height: 250))
        visibilityInputView!.delegate = self
        
        attachmentInputView = AttachmentInputView(frame: CGRect(x: 0, y: 0, width: self.view.bounds.size.width, height: 400))
        
        statusTextView.delegate = self
        statusTextView.inputAccessoryView = composeAccessoryView
        
        statusCharacterCountLabel.text = String(characterLimit)
        
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardNotification(notification:)), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
        
        if let replyToStatus = replyToStatus {
            replyToView.isHidden = false
            
            if let reblog = replyToStatus.reblog {
                self.setupReplyTo(status: reblog)
            } else {
                self.setupReplyTo(status: replyToStatus)
            }
        } else {
            replyToView.isHidden = true
        }
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        statusTextView.becomeFirstResponder()
    }
    
    func setupReplyTo(status: StatusMO) {
        if let account = status.account {
            let options: KingfisherOptionsInfo = SettingsManager.automaticallyPlayGIFs ? [] : [.onlyLoadFirstFrame]
            replyToAvatarImageView.kf.setImage(with: account.avatarURL!, options: options)
            replyToDisplayNameLabel.text = account.displayName
            replyToUsernameLabel.text = "@\(account.acct!)"
            
            statusTextView.text = "@\(account.acct!) "
        }
        
        replyToContentTextView.attributedText = status.content?.htmlAttributed(size: 13.0)
    }
    
    @objc func keyboardNotification(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
            bottomConstraint.constant = keyboardSize.height + 10
        }
    }

    @IBAction func dismissTapped(_ sender: Any) {
        dismiss(animated: true)
    }
}

extension ComposeViewController: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        let characters = statusTextView.text!.count
        let remainingCharacters = characterLimit - characters
        statusCharacterCountLabel.text = String(remainingCharacters)
        statusCharacterCountLabel.textColor = remainingCharacters < 1 ? UIColor.red : UIColor(named: "Primary")
    }
}

extension ComposeViewController: ComposeAccessoryViewDelegate, VisibilityInputViewDelegate {
    func attachmentTapped(_ sender: Any) {
        statusTextView.inputView = statusTextView.inputView == nil ? attachmentInputView : nil
        statusTextView.reloadInputViews()
    }
    
    func visibilityTapped(_ sender: Any) {
        statusTextView.inputView = statusTextView.inputView == nil ? visibilityInputView : nil
        statusTextView.reloadInputViews()
    }
    
    func tootTapped(_ sender: Any) {
        if let content = statusTextView.text {
            if !content.isEmpty && content.count <= characterLimit {
                feedbackGenerator?.prepare()
                
                MastodonAPI.postStatus(content: content, replyToID: replyToStatus?.id, spoilerText: contentWarningTextField.text, visibility: selectedVisibility) { error in
                    guard error == nil else {
                        self.feedbackGenerator?.notificationOccurred(.error)
                        AlertManager.shared.show(message: "Couldn't toot!", category: .error)
                        return
                    }
                    
                    self.feedbackGenerator?.notificationOccurred(.success)
                    AlertManager.shared.show(message: "Toot!", category: .toot)
                    
                    self.statusTextView.text = ""
                    self.contentWarningTextField.text = ""
                    self.dismiss(animated: true)
                }
            }
        }
    }
    
    func visibilitySelected(_ sender: Any, visibility: StatusVisibility) {
        selectedVisibility = visibility
        composeAccessoryView?.selectedVisibility = visibility
        
        statusTextView.inputView = nil
        statusTextView.reloadInputViews()
    }
}