//
//  CheckboxGroup.swift
//  VDS
//
//  Created by Matt Bruce on 8/23/22.
//

import Foundation
import UIKit

public class CheckboxGroup: CheckboxGroupBase<DefaultCheckboxGroupModel, Checkbox> {
    public override func didSelect(_ selectedControl: Checkbox) {
        selectedControl.toggle()
        if selectedControl.isSelected, hasError{
            hasError.toggle()
        }
        valueChanged()
    }
}

public class CheckboxGroupBase<GroupModelType: CheckboxGroupModel, ModelHandlerType: CheckboxBase<GroupModelType.SelectorModelType>>: SelectorGroupHandlerBase<GroupModelType, ModelHandlerType> {

    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    public var hasError: Bool {
        get { model.hasError }
        set {
            var newHasError = newValue
            let anySelected = selectorViews.filter { $0.isSelected == true }.count > 0
            if anySelected && newHasError {
                newHasError = false
            }
            selectorViews.forEach { handler in
                handler.hasError = newHasError
            }
            model.hasError = newHasError

        }
    }
    
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private var mainStackView: UIStackView = {
        return UIStackView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
            $0.alignment = .fill
            $0.distribution = .fillProportionally
            $0.axis = .vertical
            $0.spacing = 10
        }
    }()
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    open override func setup() {
        super.setup()
        
        isAccessibilityElement = true
        accessibilityTraits = .button
        addSubview(mainStackView)
        
        mainStackView.topAnchor.constraint(equalTo: topAnchor).isActive = true
        mainStackView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
        mainStackView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
        mainStackView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
    }
    
    open override func shouldUpdateView(viewModel: ModelType) -> Bool {
        let update = viewModel.selectors.count != model.selectors.count
        || viewModel.hasError != model.hasError
        || viewModel.surface != model.surface
        || viewModel.disabled != model.disabled
        return update
    }
    
    open override func updateView(viewModel: ModelType) {
        for selectorModel in viewModel.selectors {
            //see if view is there for the model
            if let foundSelectorView = findSelectorView(id: selectorModel.id) {
                foundSelectorView.set(with: selectorModel)
            } else {
                
                //create view
                let newSelectorView = createModelHandler(selector: selectorModel)
                
                self.selectorViews.append(newSelectorView)
                mainStackView.addArrangedSubview(newSelectorView)
            }
        }
    }
    
    public var selectedModelHandlers: [ModelHandlerType]? {
        let selected = selectorViews.filter{ $0.isSelected == true }
        guard selected.count > 0 else { return nil }
        return selected
    }
}