//
//  ProfileHeaderMovedOverlayView.swift
//  Tusker
//
//  Created by Shadowfacts on 2/23/23.
//  Copyright © 2023 Shadowfacts. All rights reserved.
//

import UIKit

class ProfileHeaderMovedOverlayView: UIView {
    
    private var movedToID: String!
    weak var delegate: TuskerNavigationDelegate?
    
    var collapse: (() -> Void)?
    
    private var avatarImageView: CachedImageView!
    private var displayNameLabel: EmojiLabel!
    private var usernameLabel: UILabel!
    private(set) var collapseButton: UIButton!
    
    init() {
        super.init(frame: .zero)
        
        let blur = UIBlurEffect(style: .systemUltraThinMaterial)
        let blurView = UIVisualEffectView(effect: blur)
        blurView.translatesAutoresizingMaskIntoConstraints = false
        addSubview(blurView)
        
        let vibrancy = UIVibrancyEffect(blurEffect: blur, style: .label)
        let vibrancyView = UIVisualEffectView(effect: vibrancy)
        vibrancyView.translatesAutoresizingMaskIntoConstraints = false
        blurView.contentView.addSubview(vibrancyView)
        
        let label = UILabel()
        label.text = "This account has moved to"
        label.font = .preferredFont(forTextStyle: .title3).withTraits(.traitBold)
        label.adjustsFontForContentSizeCategory = true
        label.textColor = .label
        
        avatarImageView = CachedImageView(cache: .avatars)
        avatarImageView.layer.masksToBounds = true
        avatarImageView.layer.cornerRadius = Preferences.shared.avatarStyle.cornerRadiusFraction * 50
        avatarImageView.addInteraction(UIPointerInteraction(delegate: self))
        avatarImageView.isUserInteractionEnabled = true
        
        displayNameLabel = EmojiLabel()
        displayNameLabel.adjustsFontForContentSizeCategory = true
        displayNameLabel.font = UIFont(descriptor: .preferredFontDescriptor(withTextStyle: .body).addingAttributes([
            .traits: [
                UIFontDescriptor.TraitKey.weight: UIFont.Weight.semibold.rawValue,
            ]
        ]), size: 0)
        
        usernameLabel = UILabel()
        usernameLabel.adjustsFontForContentSizeCategory = true
        usernameLabel.font = .preferredFont(forTextStyle: .body)
        usernameLabel.textColor = .secondaryLabel
        
        let nameVStack = UIStackView(arrangedSubviews: [
            displayNameLabel,
            usernameLabel,
        ])
        nameVStack.axis = .vertical
        nameVStack.alignment = .leading
        nameVStack.spacing = 4
        
        let accountHStack = UIStackView(arrangedSubviews: [
            avatarImageView,
            nameVStack,
        ])
        accountHStack.axis = .horizontal
        accountHStack.alignment = .top
        accountHStack.spacing = 4
        accountHStack.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(accountTapped)))
        
        let stack = UIStackView(arrangedSubviews: [
            label,
            accountHStack,
        ])
        stack.axis = .vertical
        stack.alignment = .center
        stack.spacing = 8
        stack.translatesAutoresizingMaskIntoConstraints = false
        vibrancyView.contentView.addSubview(stack)
        
        var config = UIButton.Configuration.plain()
        config.image = UIImage(systemName: "chevron.up")
        collapseButton = UIButton(configuration: config, primaryAction: UIAction(handler: { [unowned self] _ in
            self.collapse?()
        }))
        collapseButton.accessibilityLabel = "Shrink banner"
        collapseButton.isPointerInteractionEnabled = true
        collapseButton.translatesAutoresizingMaskIntoConstraints = false
        addSubview(collapseButton)
        
        NSLayoutConstraint.activate([
            blurView.leadingAnchor.constraint(equalTo: leadingAnchor),
            blurView.trailingAnchor.constraint(equalTo: trailingAnchor),
            blurView.topAnchor.constraint(equalTo: topAnchor),
            blurView.bottomAnchor.constraint(equalTo: bottomAnchor),
            
            vibrancyView.leadingAnchor.constraint(equalTo: blurView.contentView.leadingAnchor),
            vibrancyView.trailingAnchor.constraint(equalTo: blurView.contentView.trailingAnchor),
            vibrancyView.topAnchor.constraint(equalTo: blurView.contentView.topAnchor),
            vibrancyView.bottomAnchor.constraint(equalTo: blurView.contentView.bottomAnchor),
            
            stack.centerXAnchor.constraint(equalTo: vibrancyView.contentView.readableContentGuide.centerXAnchor),
            stack.centerYAnchor.constraint(equalTo: vibrancyView.contentView.centerYAnchor),
            stack.leadingAnchor.constraint(greaterThanOrEqualTo: vibrancyView.contentView.readableContentGuide.leadingAnchor),
            stack.trailingAnchor.constraint(lessThanOrEqualTo: vibrancyView.contentView.readableContentGuide.trailingAnchor),
            stack.topAnchor.constraint(greaterThanOrEqualTo: vibrancyView.contentView.topAnchor),
            stack.bottomAnchor.constraint(lessThanOrEqualTo: vibrancyView.contentView.bottomAnchor),
            
            avatarImageView.widthAnchor.constraint(equalToConstant: 50),
            avatarImageView.heightAnchor.constraint(equalToConstant: 50),
            
            bottomAnchor.constraint(equalToSystemSpacingBelow: collapseButton.bottomAnchor, multiplier: 1),
            collapseButton.centerXAnchor.constraint(equalTo: centerXAnchor),
        ])
        
        NotificationCenter.default.addObserver(self, selector: #selector(preferencesChanged), name: .preferencesChanged, object: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    @objc private func preferencesChanged() {
        avatarImageView.layer.cornerRadius = Preferences.shared.avatarStyle.cornerRadiusFraction * 50
    }
    
    func updateUI(movedTo: AccountMO) {
        movedToID = movedTo.id
        
        avatarImageView.update(for: movedTo.avatar)
        displayNameLabel.text = movedTo.displayOrUserName
        displayNameLabel.setEmojis(movedTo.emojis, identifier: movedTo.id)
        usernameLabel.text = "@\(movedTo.acct)"
    }
    
    @objc private func accountTapped() {
        delegate?.selected(account: movedToID)
    }

}

extension ProfileHeaderMovedOverlayView: UIPointerInteractionDelegate {
    func pointerInteraction(_ interaction: UIPointerInteraction, regionFor request: UIPointerRegionRequest, defaultRegion: UIPointerRegion) -> UIPointerRegion? {
        return defaultRegion
    }
    
    func pointerInteraction(_ interaction: UIPointerInteraction, styleFor region: UIPointerRegion) -> UIPointerStyle? {
        let preview = UITargetedPreview(view: interaction.view!)
        return UIPointerStyle(effect: .lift(preview))
    }
}