//
//  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.
//

import RxSwift
import RxCocoa

// Change to public if extension will be required outside this framework.
internal extension GeneralDataLoadingHandler where Self: AnyObject {

    var stateChangeBinder: Binder<GeneralDataLoadingState<Single<ResultType>>> {
        Binder(self) { base, value in
            switch value {
            case .loading:
                base.onLoadingState()

            case .result(let newResult, _):
                base.onResultsState(result: newResult)

            case .empty:
                base.onEmptyState()

            case .error(let error):
                base.onErrorState(error: error)

            case .initial:
                break
            }
        }
    }
}

public extension GeneralDataLoadingHandler where Self: AnyObject & DisposeBagHolder {

    /// Binds loading state driver to class that implements GeneralDataLoadingHandler.
    ///
    /// - Parameter loadingStateDriver: Driver that emits state change events.
    func bindLoadingState(from loadingStateDriver: Driver<GeneralDataLoadingState<Single<ResultType>>>) {
        loadingStateDriver
            .drive(stateChangeBinder)
            .disposed(by: disposeBag)
    }
}