//
//  SelectorGroupHandlerBase.swift
//  VDS
//
//  Created by Matt Bruce on 9/8/22.
//

import Foundation
import UIKit

public class SelectorGroupHandlerBase<GroupModelType: SelectorGroupModelable, ModelHandlerType: Control<GroupModelType.SelectorModelType>>: Control<GroupModelType>, Changable {

    //--------------------------------------------------
    // 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 createModelHandler(selector: ModelHandlerType.ModelType) -> ModelHandlerType {
        //create view
        let newSelectorView = ModelHandlerType(with: selector)

        //add model update to the subscribers
        newSelectorView.handlerPublisher()
            .sink { [weak self] model in
                if let cached = self?.getCachedSelector(viewModel: model), newSelectorView.shouldUpdateView(viewModel: cached) {
                    self?.replace(viewModel: model)
                }
            }
            .store(in: &subscribers)

        //add the selectedPublisher for the change
        newSelectorView
            .publisher(for: .touchUpInside)
            .sink { [weak self] control in
                self?.didSelect(control)
            }
            .store(in: &subscribers)

        return newSelectorView

    }
    
    open func didSelect(_ selectedControl: ModelHandlerType) {
        fatalError("Must override didSelect")
    }

}

public class SelectorGroupSelectedHandlerBase<GroupModelType: SelectorGroupSelectedModelable, ModelHandlerType: Control<GroupModelType.SelectorModelType>>: SelectorGroupHandlerBase<GroupModelType, ModelHandlerType> where GroupModelType.SelectorModelType == ModelHandlerType.ModelType {

    public var selectedModel: ModelHandlerType.ModelType? {
        return model.selectedModel
    }
}