//
//  ProfileDirectoryFilterView.swift
//  Tusker
//
//  Created by Shadowfacts on 2/7/21.
//  Copyright © 2021 Shadowfacts. All rights reserved.
//

import UIKit
import Pachyderm

class ProfileDirectoryFilterView: UICollectionReusableView {

    var onFilterChanged: ((Scope, DirectoryOrder) -> Void)?
    
    private var scope: UISegmentedControl!
    private var sort: UISegmentedControl!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        commonInit()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        commonInit()
    }
    
    private func commonInit() {
        scope = UISegmentedControl(items: ["Instance", NSLocalizedString("Everywhere", comment: "everywhere profile directory scope")])
        scope.selectedSegmentIndex = 0
        scope.addTarget(self, action: #selector(filterChanged), for: .valueChanged)
        
        sort = UISegmentedControl(items: [
            NSLocalizedString("Active", comment: "active profile directory sort"),
            NSLocalizedString("New", comment: "new profile directory sort"),
        ])
        sort.selectedSegmentIndex = 0
        sort.addTarget(self, action: #selector(filterChanged), for: .valueChanged)
        
        let fromLabel = UILabel()
        fromLabel.translatesAutoresizingMaskIntoConstraints = false
        fromLabel.text = NSLocalizedString("From", comment: "profile directory scope label")
        fromLabel.setContentHuggingPriority(.defaultHigh, for: .horizontal)

        let sortLabel = UILabel()
        sortLabel.translatesAutoresizingMaskIntoConstraints = false
        sortLabel.text = NSLocalizedString("Sort By", comment: "profile directory sort label")
        sortLabel.setContentHuggingPriority(.defaultHigh, for: .horizontal)
        
        let labelContainer = UIView()
        labelContainer.addSubview(sortLabel)
        labelContainer.addSubview(fromLabel)
        
        let controlStack = UIStackView(arrangedSubviews: [sort, scope])
        controlStack.axis = .vertical
        controlStack.spacing = 8
        
        let blurEffect = UIBlurEffect(style: .systemChromeMaterial)
        let blurView = UIVisualEffectView(effect: blurEffect)
        blurView.translatesAutoresizingMaskIntoConstraints = false
        addSubview(blurView)
        
        let vibrancyEffect = UIVibrancyEffect(blurEffect: blurEffect, style: .label)
        let vibrancyView = UIVisualEffectView(effect: vibrancyEffect)
        vibrancyView.translatesAutoresizingMaskIntoConstraints = false
        blurView.contentView.addSubview(vibrancyView)
        
        let filterStack = UIStackView(arrangedSubviews: [
            labelContainer,
            controlStack,
        ])
        filterStack.axis = .horizontal
        filterStack.spacing = 8
        filterStack.translatesAutoresizingMaskIntoConstraints = false
        vibrancyView.contentView.addSubview(filterStack)
        
        let separator = UIView()
        separator.backgroundColor = .separator
        separator.translatesAutoresizingMaskIntoConstraints = false
        addSubview(separator)
        
        NSLayoutConstraint.activate([
            fromLabel.leadingAnchor.constraint(equalTo: labelContainer.leadingAnchor),
            fromLabel.trailingAnchor.constraint(equalTo: labelContainer.trailingAnchor),
            fromLabel.centerYAnchor.constraint(equalTo: scope.centerYAnchor),
            
            sortLabel.leadingAnchor.constraint(equalTo: labelContainer.leadingAnchor),
            sortLabel.trailingAnchor.constraint(equalTo: labelContainer.trailingAnchor),
            sortLabel.centerYAnchor.constraint(equalTo: sort.centerYAnchor),
            
            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),
            
            filterStack.leadingAnchor.constraint(equalToSystemSpacingAfter: vibrancyView.contentView.leadingAnchor, multiplier: 1),
            vibrancyView.contentView.trailingAnchor.constraint(equalToSystemSpacingAfter: filterStack.trailingAnchor, multiplier: 1),
            filterStack.topAnchor.constraint(equalToSystemSpacingBelow: vibrancyView.contentView.topAnchor, multiplier: 1),
            vibrancyView.contentView.bottomAnchor.constraint(equalToSystemSpacingBelow: filterStack.bottomAnchor, multiplier: 1),
            
            separator.leadingAnchor.constraint(equalTo: leadingAnchor),
            separator.trailingAnchor.constraint(equalTo: trailingAnchor),
            separator.bottomAnchor.constraint(equalTo: bottomAnchor),
            separator.heightAnchor.constraint(equalToConstant: 0.5),
        ])
    }
    
    func updateUI(mastodonController: MastodonController) {
        scope.setTitle(mastodonController.accountInfo!.instanceURL.host!, forSegmentAt: 0)
    }
    
    @objc private func filterChanged() {
        let scope = Scope(rawValue: self.scope.selectedSegmentIndex)!
        let order = sort.selectedSegmentIndex == 0 ? DirectoryOrder.active : .new
        onFilterChanged?(scope, order)
    }

}

extension ProfileDirectoryFilterView {
    enum Scope: Int, Equatable {
        case instance, everywhere
    }
}