//
//  StatusStackView.swift
//  elpha-ios
//
//  Created by Dwayne Harris on 10/9/18.
//  Copyright © 2018 Elpha. All rights reserved.
//

import Kingfisher
import UIKit

protocol StatusViewDelegate: class {
    func accountTapped(_ sender: Any, account: AccountMO)
    func statusTapped(_ sender: Any, status: StatusMO)
    func loadMoreTapped(_ sender: Any, status: StatusMO, direction: PaginationDirection)
    func attachmentTapped(_ sender: Any, status: StatusMO, index: Int)
    func urlTapped(_ sender: Any, url: URL)
    func boostTapped(_ sender: Any)
    func favoriteTapped(_ sender: Any)
    func replyTapped(_ sender: Any, status: StatusMO)
    func revealTapped(_ sender: Any)
    func hideTapped(_ sender: Any)
}

class StatusView: UIView {
    @IBOutlet var contentView: UIView!
    @IBOutlet var boostView: UIView!
    @IBOutlet var boostAvatarImageView: UIImageView!
    @IBOutlet var boostDisplayNameLabel: UILabel!
    @IBOutlet var boostUsernameLabel: UILabel!
    @IBOutlet var replyView: UIView!
    @IBOutlet var replyAvatarImageView: UIImageView!
    @IBOutlet var replyDisplayNameLabel: UILabel!
    @IBOutlet var replyUsernameLabel: UILabel!
    @IBOutlet var avatarImageView: UIImageView!
    @IBOutlet var displayNameLabel: UILabel!
    @IBOutlet var usernameLabel: UILabel!
    @IBOutlet var timestampLabel: UILabel!
    @IBOutlet var repliesImageView: UIImageView!
    @IBOutlet var repliesLabel: UILabel!
    @IBOutlet var boostsImageView: UIImageView!
    @IBOutlet var boostsLabel: UILabel!
    @IBOutlet var favoritesImageView: UIImageView!
    @IBOutlet var favoritesLabel: UILabel!
    @IBOutlet var topDividerView: UIView!
    @IBOutlet var bottomDividerView: UIView!
    @IBOutlet var attachmentsView: AttachmentsView!
    @IBOutlet var detailsView: UIView!
    @IBOutlet var spoilerImageView: UIImageView!
    @IBOutlet var pinImageView: UIImageView!
    @IBOutlet var topLoadMoreView: UIView!
    @IBOutlet var bottomLoadMoreView: UIView!
    @IBOutlet var contentTextView: UITextView!
    
    var status: StatusMO?
    var spoilerView: UIVisualEffectView?
    var feedbackGenerator: UINotificationFeedbackGenerator?
    
    weak var delegate: StatusViewDelegate?
    
    @IBAction func boostViewTapped(_ sender: Any) {
        if let delegate = delegate, let status = status {
            delegate.accountTapped(self, account: status.account!)
        }
    }
    
    @IBAction func replyViewTapped(_ sender: Any) {
        if let delegate = delegate,
            let status = status,
            let replyAccountID = status.inReplyToAccountID,
            let replyAccount = MastodonDataManager.account(id: replyAccountID) {
            delegate.accountTapped(self, account: replyAccount)
        }
    }
    
    @IBAction func accountViewTapped(_ sender: Any) {
        if let delegate = delegate, let status = status {
            if let reblog = status.reblog {
                delegate.accountTapped(self, account: reblog.account!)
            } else {
                delegate.accountTapped(self, account: status.account!)
            }
        }
    }
    
    @IBAction func mainViewTapped(_ sender: Any) {
        if let delegate = delegate, let status = status {
            if let reblog = status.reblog {
                delegate.statusTapped(self, status: reblog)
            } else {
                delegate.statusTapped(self, status: status)
            }
        }
    }
    
    @IBAction func spoilerImageTapped(_ sender: Any) {
        if let status = status {
            status.hidden = true
            CoreDataManager.shared.saveContext()
            delegate?.hideTapped(self)
        }
    }
    
    @IBAction func topLoadMoreViewTapped(_ sender: Any) {
        if let delegate = delegate, let status = status {
            delegate.loadMoreTapped(self, status: status, direction: .prev)
        }
    }
    
    @IBAction func bottomLoadMoreViewTapped(_ sender: Any) {
        if let delegate = delegate, let status = status {
            delegate.loadMoreTapped(self, status: status, direction: .next)
        }
    }
    
    @IBAction func boostTapped(_ sender: Any) {
        if let status = status {
            let allowedVisibility = [StatusVisibility.public, StatusVisibility.unlisted]
            let visibility = StatusVisibility(rawValue: status.visibility!)
            
            guard allowedVisibility.contains(visibility!) else {
                return
            }
            
            feedbackGenerator?.prepare()
            
            if status.reblogged {
                status.reblogged = false
                status.reblogsCount = status.reblogsCount - 1
                
                MastodonAPI.unreblog(statusID: status.id!) { error in
                    guard error == nil else {
                        AlertManager.shared.show(message: error!.localizedDescription, category: .error)
                        self.feedbackGenerator?.notificationOccurred(.error)
                        return
                    }
                    
                    AlertManager.shared.show(message: "Unboosted", category: .boosted)
                    self.feedbackGenerator?.notificationOccurred(.success)
                }
            } else {
                status.reblogged = true
                status.reblogsCount = status.reblogsCount + 1
                
                MastodonAPI.reblog(statusID: status.id!) { error in
                    guard error == nil else {
                        AlertManager.shared.show(message: error!.localizedDescription, category: .error)
                        self.feedbackGenerator?.notificationOccurred(.error)
                        return
                    }
                    
                    AlertManager.shared.show(message: "Boosted!", category: .boosted)
                    self.feedbackGenerator?.notificationOccurred(.success)
                }
            }
            
            CoreDataManager.shared.saveContext()
            delegate?.boostTapped(self)
        }
    }
    
    @IBAction func favoriteTapped(_ sender: Any) {
        if let status = status {
            feedbackGenerator?.prepare()
            
            if status.favorited {
                status.favorited = false
                status.favoritesCount = status.favoritesCount - 1
                
                MastodonAPI.unfavorite(statusID: status.id!) { error in
                    guard error == nil else {
                        AlertManager.shared.show(message: error!.localizedDescription, category: .error)
                        self.feedbackGenerator?.notificationOccurred(.error)
                        return
                    }
                    
                    AlertManager.shared.show(message: "Unfavorited", category: .favorited)
                    self.feedbackGenerator?.notificationOccurred(.success)
                }
            } else {
                status.favorited = true
                status.favoritesCount = status.favoritesCount + 1
                
                MastodonAPI.favorite(statusID: status.id!) { error in
                    guard error == nil else {
                        AlertManager.shared.show(message: error!.localizedDescription, category: .error)
                        self.feedbackGenerator?.notificationOccurred(.error)
                        return
                    }
                    
                    AlertManager.shared.show(message: "Favorited!", category: .favorited)
                    self.feedbackGenerator?.notificationOccurred(.success)
                }
            }
            
            CoreDataManager.shared.saveContext()
            delegate?.favoriteTapped(self)
        }
    }
    
    @IBAction func replyTapped(_ sender: Any) {
        delegate?.replyTapped(self, status: status!)
    }
    
    @objc func reveal(sender: UITapGestureRecognizer) {
        if let status = status {
            status.hidden = false
            CoreDataManager.shared.saveContext()
            delegate?.revealTapped(self)
        }
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }
    
    private func setup() {
        Bundle.main.loadNibNamed("StatusView", owner: self, options: nil)
        addSubview(contentView)
        contentView.frame = self.bounds
        attachmentsView.delegate = self
        contentTextView.delegate = self
        feedbackGenerator = UINotificationFeedbackGenerator()
        
        avatarImageView.setRoundedCorners()
        boostAvatarImageView.setRoundedCorners()
        replyAvatarImageView.setRoundedCorners()
    }
    
    public func update(withStatus status: StatusMO, excludeReplyView: Bool = false) {
        self.status = status
        let statusCellHidden = status.hidden
        
        spoilerImageView.isHidden = true
        
        let avatarOptions: KingfisherOptionsInfo = SettingsManager.automaticallyPlayGIFs ? [] : [.onlyLoadFirstFrame]
        
        func updateStatusContent(_ status: StatusMO) {
            if let account = status.account {
                avatarImageView.kf.setImage(with: account.avatarURL!, options: avatarOptions)
                displayNameLabel.text = account.displayName
                usernameLabel.text = "@\(account.acct!)"
            }
            
            if let attachments = status.attachments, attachments.count > 0 {
                UIView.performWithoutAnimation {
                    attachmentsView.isHidden = false
                    attachmentsView.update(withAttachments: attachments.array as! [AttachmentMO])
                }
            } else {
                attachmentsView.isHidden = true
            }
            
            contentTextView.attributedText = status.attributedContent
            
            if statusCellHidden {
                if spoilerView == nil {
                    let spoilerText = UILabel(frame: contentTextView.frame)
                    spoilerText.textColor = UIColor(named: "Primary")
                    spoilerText.font = UIFont.systemFont(ofSize: 15, weight: .bold)
                    spoilerText.textAlignment = .center
                    spoilerText.text = status.spoilerText
                    spoilerText.numberOfLines = 0
                    spoilerText.translatesAutoresizingMaskIntoConstraints = false
                    
                    let blurEffectView = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffect.Style.light))
                    blurEffectView.translatesAutoresizingMaskIntoConstraints = false
                    blurEffectView.contentView.addSubview(spoilerText)
                    
                    NSLayoutConstraint.activate([
                        spoilerText.leadingAnchor.constraint(equalTo: blurEffectView.leadingAnchor, constant: 8),
                        spoilerText.trailingAnchor.constraint(equalTo: blurEffectView.trailingAnchor, constant: -8),
                        spoilerText.centerYAnchor.constraint(equalTo: blurEffectView.centerYAnchor),
                    ])
                    
                    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.reveal))
                    tapGesture.numberOfTapsRequired = 1
                    tapGesture.numberOfTouchesRequired = 1
                    blurEffectView.addGestureRecognizer(tapGesture)
                    blurEffectView.isUserInteractionEnabled = true
                    
                    self.spoilerView = blurEffectView
                    self.contentView.addSubview(blurEffectView)
                    
                    NSLayoutConstraint.activate([
                        blurEffectView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
                        blurEffectView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
                        blurEffectView.topAnchor.constraint(equalTo: contentTextView.topAnchor),
                        blurEffectView.bottomAnchor.constraint(equalTo: detailsView.topAnchor),
                    ])
                }
            } else {
                if let spoilerView = spoilerView {
                    spoilerView.removeFromSuperview()
                    self.spoilerView = nil
                }
                
                if let spoilerText = status.spoilerText, !spoilerText.isEmpty {
                    spoilerImageView.isHidden = false
                }
            }
            
            timestampLabel.text = status.createdAt!.timeAgo()
            repliesLabel.text = NumberFormatter.localizedString(from: NSNumber(value: status.repliesCount), number: .decimal)
            boostsLabel.text = NumberFormatter.localizedString(from: NSNumber(value: status.reblogsCount), number: .decimal)
            favoritesLabel.text = NumberFormatter.localizedString(from: NSNumber(value: status.favoritesCount), number: .decimal)
            
            let visibility = StatusVisibility(rawValue: status.visibility!)
            
            switch visibility! {
            case .private:
                boostsImageView.image = UIImage(named: "Private")
            case .direct:
                boostsImageView.image = UIImage(named: "Direct")
            default:
                if status.reblogged {
                    boostsImageView.image = UIImage(named: "Boost Bold")
                } else {
                    boostsImageView.image = UIImage(named: "Boost Regular")
                }
            }
            
            if status.favorited {
                favoritesImageView.image = UIImage(named: "Star Filled")
            } else {
                favoritesImageView.image = UIImage(named: "Star Regular")
            }
            
            pinImageView.isHidden = !status.pinned
        }
        
        if let reblog = status.reblog {
            boostView.isHidden = false
            
            if let account = status.account {
                boostAvatarImageView.kf.setImage(with: account.avatarURL!, options: avatarOptions)
                boostDisplayNameLabel.text = account.displayName
                boostUsernameLabel.text = "@\(account.acct!)"
            }
            
            updateStatusContent(reblog)
        } else {
            boostView.isHidden = true
            
            if let account = status.account {
                avatarImageView.kf.setImage(with: account.avatarURL!, options: avatarOptions)
                displayNameLabel.text = account.displayName
                usernameLabel.text = "@\(account.acct!)"
            }
            
            updateStatusContent(status)
        }
        
        if let replyAccountID = status.inReplyToAccountID, let replyAccount = MastodonDataManager.account(id: replyAccountID), !excludeReplyView {
            replyView.isHidden = false
            replyAvatarImageView.kf.setImage(with: replyAccount.avatarURL!, options: avatarOptions)
            replyDisplayNameLabel.text = replyAccount.displayName
            replyUsernameLabel.text = "@\(replyAccount.acct!)"
        } else {
            replyView.isHidden = true
        }
    }
}

extension StatusView: AttachmentsViewDelegate {
    func attachmentTapped(_ sender: Any, index: Int) {
        if let delegate = delegate, let status = status {
            if let reblog = status.reblog {
                delegate.attachmentTapped(self, status: reblog, index: index)
            } else {
                delegate.attachmentTapped(self, status: status, index: index)
            }
        }
    }
}

extension StatusView: UITextViewDelegate {
    func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
        if let mentions = status?.mentions {
            for mention in mentions {
                if URL == mention.url {
                    if let account = MastodonDataManager.account(id: mention.id) {
                        delegate?.accountTapped(self, account: account)
                    }
                    
                    return false
                }
            }
        }
        
        if URL.scheme == "http" || URL.scheme == "https" {
            delegate?.urlTapped(self, url: URL)
        }
        
        return false
    }
}