Tusker/Tusker/Views/Profile Header/ProfileHeaderTableViewCell.swift

//
//  ProfileHeaderTableViewCell.swift
//  Tusker
//
//  Created by Shadowfacts on 8/27/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import Pachyderm

protocol ProfileHeaderTableViewCellDelegate: TuskerNavigationDelegate {
    func showMoreOptions()
}

class ProfileHeaderTableViewCell: UITableViewCell, PreferencesAdaptive {
    
    var delegate: ProfileHeaderTableViewCellDelegate?

    @IBOutlet weak var headerImageView: UIImageView!
    @IBOutlet weak var avatarContainerView: UIView!
    @IBOutlet weak var avatarImageView: UIImageView!
    @IBOutlet weak var displayNameLabel: UILabel!
    @IBOutlet weak var usernameLabel: UILabel!
    @IBOutlet weak var followsYouLabel: UILabel!
    @IBOutlet weak var noteLabel: HTMLContentLabel!
    
    var accountID: String!
    
    var avatarURL: URL?
    
    var headerImageDownloadTask: URLSessionDataTask?
    
    override func awakeFromNib() {
        avatarContainerView.layer.masksToBounds = true
        avatarImageView.layer.masksToBounds = true
        avatarImageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(avatarPressed)))
        avatarImageView.isUserInteractionEnabled = true
        headerImageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(headerPressed)))
        headerImageView.isUserInteractionEnabled = true
    }
    
    func updateUIForPreferences() {
        guard let account = MastodonCache.account(for: accountID) else { fatalError("Missing cached account \(accountID!)") }
        
        avatarContainerView.layer.cornerRadius = Preferences.shared.avatarStyle.cornerRadius(for: avatarContainerView)
        avatarImageView.layer.cornerRadius = Preferences.shared.avatarStyle.cornerRadius(for: avatarImageView)
        displayNameLabel.text = account.realDisplayName
    }
    
    func updateUI(for accountID: String) {
        self.accountID = accountID
        guard let account = MastodonCache.account(for: accountID) else { fatalError("Missing cached account \(accountID)") }
        
        updateUIForPreferences()
        
        usernameLabel.text = "@\(account.acct)"
        
        avatarImageView.image = nil
        avatarURL = account.avatar
        AvatarCache.shared.get(account.avatar) { image in
            DispatchQueue.main.async {
                self.avatarImageView.image = image
                self.avatarURL = nil
            }
        }
        headerImageDownloadTask = URLSession.shared.dataTask(with: account.header) { data, response, error in
            guard error == nil, let data = data, let image = UIImage(data: data) else { return }
            DispatchQueue.main.async {
                self.headerImageView.image = image
                self.headerImageDownloadTask = nil
            }
        }
        headerImageDownloadTask!.resume()
        
        // todo: HTML parsing
        noteLabel.text = account.note
        noteLabel.delegate = self
        
        if let relationship = MastodonCache.relationship(for: accountID) {
            followsYouLabel.isHidden = !relationship.followedBy
        } else {
            MastodonCache.relationship(for: accountID) { relationship in
                DispatchQueue.main.async {
                    self.followsYouLabel.isHidden = !(relationship?.followedBy ?? false)
                }
            }
        }
    }
    
    override func prepareForReuse() {
        if let url = avatarURL {
            AvatarCache.shared.cancel(url)
        }
    }
    
    @IBAction func morePressed(_ sender: Any) {
        delegate?.showMoreOptions()
    }
    
    @objc func avatarPressed() {
        delegate?.showLargeImage(avatarImageView.image!, description: nil, animatingFrom: avatarImageView)
    }
    
    @objc func headerPressed() {
        delegate?.showLargeImage(headerImageView.image!, description: nil, animatingFrom: headerImageView)
    }
    
}

extension ProfileHeaderTableViewCell: HTMLContentLabelDelegate {
    
    func selected(mention: Mention) {
        delegate?.selected(mention: mention)
    }
    
    func selected(tag: Hashtag) {
        delegate?.selected(tag: tag)
    }
    
    func selected(url: URL) {
        delegate?.selected(url: url)
    }
    
}