//
//  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) {
        for (index, control) in selectorViews.enumerated() {
            //only change the old and new
            if control == selectedControl {
                let updated = model.selectors[index].copyWith {
                    $0.selected.toggle()
                }
                model.selectors[index] = updated
            }
        }
        sendActions(for: .valueChanged)
    }
}

public class CheckboxGroupBase<GroupModelType: CheckboxGroupModel, ModelHandlerType: ModelHandlerable & UIControl>: SelectorGroupHandlerBase<GroupModelType, ModelHandlerType> where GroupModelType.SelectorModelType == ModelHandlerType.ModelType {

    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    public var hasError: Bool {
        get { model.hasError }
        set {
            let selectors = model.selectors.compactMap { existing in
                return existing.copyWith {
                    $0.hasError = newValue
                }
            }
            model.hasError = newValue
            model.selectors = selectors
        }
    }
    
    //--------------------------------------------------
    // 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(inputId: selectorModel.inputId) {
                foundSelectorView.set(with: selectorModel)
            } else {
                
                //create view
                let newSelectorView = createModelHandler(selector: selectorModel)
                
                self.selectorViews.append(newSelectorView)
                mainStackView.addArrangedSubview(newSelectorView)
            }
        }
    }
}

public class SelectorGroupHandlerBase<GroupModelType: SelectorGroupModelable, ModelHandlerType: ModelHandlerable & UIControl>: Control<GroupModelType>, SelectorGroupModelHandlerable, Changable where GroupModelType.SelectorModelType == ModelHandlerType.ModelType {

    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    public var selectorViews: [ModelHandlerType] = []
    
    public var onChange: Blocks.ActionBlock?
        
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    override public var disabled: Bool {
        didSet {
            updateSelectors()
        }
    }
    
    override public var surface: Surface {
        didSet {
            updateSelectors()
        }
    }
    
    public func findSelectorView(inputId: String?) -> ModelHandlerType? {
        return selectorViews.first(where: { existingSelectorView in
            return existingSelectorView.model.inputId == inputId
        })
    }
        
    public func updateSelectors(){
        let selectors = model.selectors.compactMap { existing in
            return existing.copyWith {
                $0.disabled = disabled
                $0.surface = surface
            }
        }
        model.selectors = selectors
    }

    public func getCachedSelector(viewModel: ModelHandlerType.ModelType) -> ModelHandlerType.ModelType? {
        if let  index = model.selectors.firstIndex(where: { element in
            return element.inputId == viewModel.inputId
        }) {
            return model.selectors[index]
        } else {
            return nil
        }
    }
    
    public func replace(viewModel: ModelHandlerType.ModelType){
        if let  index = model.selectors.firstIndex(where: { element in
            return element.inputId == viewModel.inputId
        }) {
            model.selectors[index] = viewModel
        }
    }
    
    public func didSelect(_ selectedControl: ModelHandlerType) {
        fatalError("Must override didSelect")
    }

}