//
//  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 {
    
    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: StatusContentLabel!
    @IBOutlet weak var fieldsStackView: UIStackView!
    @IBOutlet weak var fieldNamesStackView: UIStackView!
    @IBOutlet weak var fieldValuesStack: UIStackView!
    
    var accountID: String!
    
    var avatarURL: URL?
    var headerURL: URL?
    
    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
        
        NotificationCenter.default.addObserver(self, selector: #selector(updateUIForPreferences), name: .preferencesChanged, object: nil)
    }
    
    func updateUI(for accountID: String) {
        guard accountID != self.accountID else { return }
        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
        ImageCache.avatars.get(account.avatar) { (data) in
            guard let data = data else { return }
            DispatchQueue.main.async {
                self.avatarImageView.image = UIImage(data: data)
                self.avatarURL = nil
            }
        }
        self.headerImageView.image = nil
        if let header = account.header {
            ImageCache.headers.get(header) { (data) in
                guard let data = data else { return }
                DispatchQueue.main.async {
                    self.headerImageView.image = UIImage(data: data)
                    self.headerURL = nil
                }
            }
        }
        
        noteLabel.navigationDelegate = delegate
        noteLabel.setTextFromHtml(account.note)
        noteLabel.setEmojis(account.emojis)
        
        if accountID != MastodonController.account.id {
            // don't show relationship label for the user's own account
            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)
                    }
                }
            }
        }
        
        if let fields = account.fields, !fields.isEmpty {
            fieldsStackView.isHidden = false
            
            for field in fields {
                let nameLabel = UILabel()
                nameLabel.text = field.name
                nameLabel.font = .boldSystemFont(ofSize: 17)
                nameLabel.textAlignment = .right
                fieldNamesStackView.addArrangedSubview(nameLabel)
                
                let valueLabel = ContentLabel()
                valueLabel.setTextFromHtml(field.value)
                valueLabel.setEmojis(account.emojis)
                valueLabel.font = .systemFont(ofSize: 17)
                valueLabel.textAlignment = .left
                valueLabel.awakeFromNib() // TODO: this shouldn't be necessary
                valueLabel.navigationDelegate = delegate
                fieldValuesStack.addArrangedSubview(valueLabel)
            }
        } else {
            fieldsStackView.isHidden = true
        }
    }
    
    @objc 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
    }
    
    override func prepareForReuse() {
        if let url = avatarURL {
            ImageCache.avatars.cancel(url)
        }
        if let url = headerURL {
            ImageCache.headers.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: MenuPreviewProvider {
    func getPreviewProviders(for location: CGPoint, sourceViewController: UIViewController) -> PreviewProviders? {
        let noteLabelPoint = noteLabel.convert(location, from: self)
        if noteLabel.bounds.contains(noteLabelPoint),
            let link = noteLabel.getLink(atPoint: noteLabelPoint) {
            return (
                content: { self.noteLabel.getViewController(forLink: link.url, inRange: link.range) },
                actions: {
                    let text = (self.noteLabel.text! as NSString).substring(with: link.range)
                    if let mention = self.noteLabel.getMention(for: link.url, text: text) {
                        return self.actionsForProfile(accountID: mention.id)
                    } else if let hashtag = self.noteLabel.getHashtag(for: link.url, text: text) {
                        return self.actionsForHashtag(hashtag)
                    } else {
                        return self.actionsForURL(link.url)
                    }
                }
            )
        } else {
            return nil
        }
    }
}