//
// Copyright 2021 New Vector Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import SwiftUI

@available(iOS 14, *)
typealias TemplateSimpleScreenViewModelType = StateStoreViewModel<TemplateSimpleScreenViewState,
                                                                  TemplateSimpleScreenStateAction,
                                                                  TemplateSimpleScreenViewAction>
@available(iOS 14, *)
class TemplateSimpleScreenViewModel: TemplateSimpleScreenViewModelType, TemplateSimpleScreenViewModelProtocol {

    // MARK: - Properties

    // MARK: Private

    // MARK: Public

    var completion: ((TemplateSimpleScreenViewModelResult) -> Void)?

    // MARK: - Setup

    init(promptType: TemplateSimpleScreenPromptType, initialCount: Int = 0) {
        super.init(initialViewState: TemplateSimpleScreenViewState(promptType: promptType, count: 0))
    }

    // MARK: - Public

    override func process(viewAction: TemplateSimpleScreenViewAction) {
        switch viewAction {
        case .accept:
            completion?(.accept)
        case .cancel:
            completion?(.cancel)
        case .incrementCount, .decrementCount:
            dispatch(action: .viewAction(viewAction))
        }
    }

    override class func reducer(state: inout TemplateSimpleScreenViewState, action: TemplateSimpleScreenStateAction) {
        switch action {
        case .viewAction(let viewAction):
            switch viewAction {
            case .incrementCount:
                state.count += 1
            case .decrementCount:
                state.count -= 1
            case .accept, .cancel:
                break
            }
        }
        UILog.debug("[TemplateSimpleScreenViewModel] reducer with action \(action) produced state: \(state)")
    }
}