//
//  MoleculeStack.swift
//  MVMCoreUI
//
//  Created by Suresh, Kamlesh on 10/3/19.
//  Copyright © 2019 Suresh, Kamlesh. All rights reserved.
//
//  A stack that has a list molecule stack items.

import Foundation

@objcMembers public class MoleculeStackModel: ContainerModel, MoleculeProtocol, StackModelProtocol {
    public static var identifier: String = "stack"
    public var backgroundColor: Color?
    public var molecules: [MoleculeStackItemModel]
    public var axis: NSLayoutConstraint.Axis = .vertical
    public var spacing: CGFloat = 16.0
    public var useStackSpacingBeforeFirstItem = false

    public init(molecules: [MoleculeStackItemModel]) {
        self.molecules = molecules
        super.init()
    }

    enum StackCodingKeys: String, CodingKey {
        case moleculeName
        case molecules
        case axis
        case spacing
    }

    required public init(from decoder: Decoder) throws {
        let typeContainer = try decoder.container(keyedBy: StackCodingKeys.self)
        molecules = try typeContainer.decode([MoleculeStackItemModel].self, forKey: .molecules)
        if let axisString = try typeContainer.decodeIfPresent(String.self, forKey: .axis), let optionalAxis = NSLayoutConstraint.Axis(rawValue: axisString) {
            axis = optionalAxis
        }
        if let spacing = try typeContainer.decodeIfPresent(CGFloat.self, forKey: .spacing) {
            self.spacing = spacing
        }
        try super.init(from: decoder)
    }

    public override func encode(to encoder: Encoder) throws {
        try super.encode(to: encoder)
        var container = encoder.container(keyedBy: StackCodingKeys.self)
        try container.encode(moleculeName, forKey: .moleculeName)
        try container.encodeIfPresent(molecules, forKey: .molecules)
        try container.encodeIfPresent(axis.rawValueString, forKey: .axis)
        try container.encodeIfPresent(spacing, forKey: .spacing)
    }
}