DependencyInjectionHelper.swift

import Swinject /// https://github.com/Swinject/Swinject.git
import Foundation

@propertyWrapper
public struct Inject<Dependency> {
    public let wrappedValue: Dependency

    public init(resolver: Resolver = AppAssembler.shared.resolver) {
        wrappedValue = resolver.resolve(Dependency.self)!
    }
}

// Source:
// - https://ali-akhtar.medium.com/ios-dependency-injection-using-swinject-9c4ceff99e41
// - https://github.com/Swinject/Swinject/blob/master/Documentation/Assembler.md
public final class AppAssembler {
    /// Shared app assembler
    public static let shared = AppAssembler()
    private init() {}

    private var assembler: Assembler!
    var container = Container()

    /// Clear dependency graph and remove assembler
    public func clearAll() {
        container = .init()
        assembler = nil
    }

    /// Configure all registered assembly using `Assembler`. You must call this method on app launch or before resolving any dependencies
    ///
    /// After this call you can resolve your dependencies
    ///
    /// Example:
    ///  ```
    /// @Inject var myService: MyService
    ///
    ///   OR
    ///
    /// let myService = AppAssembler.shared.resolver.resolve(MyService.self)
    ///  ```
    /// - Parameter assemblies: List of your Assemblies
    public func configure(_ assemblies: Assembly...) {
        assembler = Assembler(assemblies, container: container)
    }

    /// Synchronized view of the container for thread safety.
    public var resolver: Resolver {
        container.synchronize()
    }
}