//
//  MoleculeStackTemplate.swift
//  MVMCoreUI
//
//  Created by Scott Pfeil on 2/11/19.
//  Copyright © 2019 Verizon Wireless. All rights reserved.
//

import UIKit

public class MoleculeStackTemplate: ThreeLayerViewController {
    
    public override func spaceBetweenTopAndMiddle() -> CGFloat? {
        return 0
    }
    
    public override func viewForTop() -> UIView? {
        guard let moleculeJSON = loadObject?.pageJSON?.optionalDictionaryForKey("header"), let molecule = MVMCoreUIMoleculeMappingObject.shared()?.createMolecule(forJSON: moleculeJSON, delegateObject: delegateObject() as? MVMCoreUIDelegateObject, constrainIfNeeded: true) else {
            return nil
        }
        return molecule
    }
    
    public override func viewForMiddle() -> UIView? {
        guard let moleculeJSON = loadObject?.pageJSON?.optionalDictionaryForKey("moleculeStack") else {
            return nil
        }
        let stack = MoleculeStackView(frame: .zero)
        stack.useStackSpacingBeforeFirstItem = true
        stack.setWithJSON(moleculeJSON, delegateObject: delegateObject() as? MVMCoreUIDelegateObject, additionalData: nil)
        return stack
    }
    
    override public func viewForBottom() -> UIView? {
        guard let moleculeJSON = loadObject?.pageJSON?.optionalDictionaryForKey("footer"), let molecule = MVMCoreUIMoleculeMappingObject.shared()?.createMolecule(forJSON: moleculeJSON, delegateObject: delegateObject() as? MVMCoreUIDelegateObject, constrainIfNeeded: true) else {
            return nil
        }
        return molecule
    }
    
    // MARK: - cache handling
    public override func pageTypesToListenFor() -> [Any]? {
        guard let pageType = self.pageType else {
            return super.pageTypesToListenFor()
        }
        return [pageType]
    }
    
    public override func modulesToListenFor() -> [Any]? {
        return loadObject?.requestParameters?.modules
    }
    
    open override func requiredModules(fromPageJSON page: [AnyHashable : Any]?) -> [Any]? {
        return modulesNeeded() as? [Any]
    }
    
    /// Gets the modules needed.
    func modulesNeeded() -> NSMutableArray? {
        let modules: NSMutableArray = []
        let delegate = delegateObject() as? MVMCoreUIDelegateObject
        MVMCoreUIMoleculeMappingObject.addRequiredModules(forJSON: loadObject?.pageJSON?.optionalDictionaryForKey("header"), delegateObject: delegate, moduleList: modules, errorList: nil)
        MVMCoreUIMoleculeMappingObject.addRequiredModules(forJSON: loadObject?.pageJSON?.optionalDictionaryForKey("footer"), delegateObject: delegate, moduleList: modules, errorList: nil)
        MVMCoreUIMoleculeMappingObject.addRequiredModules(forJSON: loadObject?.pageJSON?.optionalDictionaryForKey("moleculeStack"), delegateObject: delegate, moduleList: modules, errorList: nil)
        return modules.count > 0 ? modules : nil
    }
}