//
// Copyright 2022 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 Foundation

enum InviteUsersScreenErrorType: Error {
    case unknown
}

enum InviteUsersScreenViewModelAction {
    case close
    case proceed(users: [UserProfile])
}

struct InviteUsersScreenViewState: BindableState {
    var bindings = InviteUsersScreenViewStateBindings()
    
    var usersSection: UserDiscoverySection = .init(type: .suggestions, users: [])
    var selectedUsers: [UserProfile] = []
    
    var isSearching: Bool {
        !bindings.searchQuery.isEmpty
    }
    
    var hasEmptySearchResults: Bool {
        isSearching && usersSection.type == .searchResult && usersSection.users.isEmpty
    }
    
    var scrollToLastID: String?
    
    func isUserSelected(_ user: UserProfile) -> Bool {
        selectedUsers.contains { $0.userID == user.userID }
    }
}

struct InviteUsersScreenViewStateBindings {
    var searchQuery = ""
    
    /// Information describing the currently displayed alert.
    var alertInfo: AlertInfo<InviteUsersScreenErrorType>?
}

enum InviteUsersScreenViewAction {
    case close
    case proceed
    case tapUser(UserProfile)
    case deselectUser(UserProfile)
}