//
//  Functions.swift
//  CoreStore
//
//  Copyright © 2018 John Rommel Estropia
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.
//

import Foundation

// MARK: Associated Objects

@inline(__always)
/// type(of:) doesn't return the dynamic type anymore, use this to guarantee correct dispatch of class methods
internal func cs_dynamicType<T: AnyObject>(of instance: T) -> T.Type {
    
    return object_getClass(instance) as! T.Type
}

// MARK: Associated Objects

@inline(__always)
internal func cs_getAssociatedObjectForKey<T: AnyObject>(_ key: UnsafeRawPointer, inObject object: Any) -> T? {
    
    switch objc_getAssociatedObject(object, key) {
        
    case let associatedObject as T:
        return associatedObject
        
    case let associatedObject as WeakObject:
        return associatedObject.object as? T
        
    default:
        return nil
    }
}

@inline(__always)
internal func cs_setAssociatedRetainedObject<T: AnyObject>(_ associatedObject: T?, forKey key: UnsafeRawPointer, inObject object: Any) {
    
    objc_setAssociatedObject(object, key, associatedObject, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}

@inline(__always)
internal func cs_setAssociatedCopiedObject<T: AnyObject>(_ associatedObject: T?, forKey key: UnsafeRawPointer, inObject object: Any) {
    
    objc_setAssociatedObject(object, key, associatedObject, .OBJC_ASSOCIATION_COPY_NONATOMIC)
}

@inline(__always)
internal func cs_setAssociatedWeakObject<T: AnyObject>(_ associatedObject: T?, forKey key: UnsafeRawPointer, inObject object: Any) {
    
    if let associatedObject = associatedObject {
        
        objc_setAssociatedObject(object, key, WeakObject(associatedObject), .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
    }
    else {
        
        objc_setAssociatedObject(object, key, nil, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
    }
}


// MARK: Printing Utilities

@inline(__always)
internal func cs_typeName<T>(_ value: T) -> String {
    
    return "'\(String(reflecting: type(of: value)))'"
}

@inline(__always)
internal func cs_typeName<T>(_ value: T.Type) -> String {
    
    return "'\(value)'"
}

@inline(__always)
internal func cs_typeName(_ value: AnyClass) -> String {
    
    return "'\(value)'"
}

@inline(__always)
internal func cs_typeName(_ name: String) -> String {
    
    return "<\(name)>"
}

@inline(__always)
internal func cs_typeName(_ name: String?) -> String {
    
    return "<\(name ?? "unknown")>"
}


// MARK: Functional

@inline(__always)
internal func cs_lazy<T>(_ closure: () -> T) -> T {
    
    return closure()
}