// 
// 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 14.0, *)
struct TemplateRoomList: View {
    
    // MARK: - Properties
    
    // MARK: Private
    
    @Environment(\.theme) private var theme: ThemeSwiftUI
    
    // MARK: Public
    
    @ObservedObject var viewModel: TemplateRoomListViewModel
    
    var body: some View {
        listContent
            .navigationTitle("Rooms")
            .toolbar {
                ToolbarItem(placement: .primaryAction) {
                    Button(VectorL10n.done) {
                        viewModel.process(viewAction: .cancel)
                    }
                }
                ToolbarItem(placement: .cancellationAction) {
                    Button(VectorL10n.cancel) {
                        viewModel.process(viewAction: .cancel)
                    }
                }
            }
    }
    
    @ViewBuilder
    var listContent: some View {
        if viewModel.viewState.rooms.isEmpty {
            Text("No Rooms")
        } else {
            LazyVStack(spacing: 0) {
                ForEach(viewModel.viewState.rooms) { room in
                    TemplateRoomListRow(avatar: room.avatar, displayName: room.displayName)
                }
            }
            .frame(maxHeight: .infinity, alignment: .top)
        }
    }
}

// MARK: - Previews

@available(iOS 14.0, *)
struct TemplateRoomList_Previews: PreviewProvider {
    static var previews: some View {
        MockTemplateRoomListScreenState.screenGroup(addNavigation: true)
    }
}