//
//  Copyright (c) 2018 Touch Instinct
//
//  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.
//

public extension ContentLoadingViewModel {

    /// Returns true if self == .placeholder.
    var isPlaceholder: Bool {
        if case .placeholder = self {
            return true
        } else {
            return false
        }
    }
}

public extension ContentLoadingViewModel where PlaceholderType == Void {

    /// Creates ContentLoadingViewModel with placeholder.
    static var placeholder: ContentLoadingViewModel<ContentType, PlaceholderType> {
        .placeholder(())
    }
}

public extension ContentLoadingViewModel where PlaceholderType == [Void] {

    /// Creates ContentLoadingViewModel with placeholder.
    ///
    /// - Parameter numberOfItems: Number of placeholders to create.
    /// - Returns: ContentLoadingViewModel with placeholder.
    static func placeholders(numberOfItems: Int) -> ContentLoadingViewModel<ContentType, PlaceholderType> {
        .placeholder(Array(repeating: (), count: numberOfItems))
    }
}