//
//  ProviderEntitySelector.swift
//  Passepartout
//
//  Created by Davide De Rosa on 10/22/24.
//  Copyright (c) 2024 Davide De Rosa. All rights reserved.
//
//  https://github.com/passepartoutvpn
//
//  This file is part of Passepartout.
//
//  Passepartout is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  Passepartout is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with Passepartout.  If not, see <http://www.gnu.org/licenses/>.
//

import CommonLibrary
import CommonUtils
import PassepartoutKit
import SwiftUI

struct ProviderEntitySelector: View {

    @ObservedObject
    var profileManager: ProfileManager

    @ObservedObject
    var tunnel: ExtendedTunnel

    let profile: Profile

    let module: Module

    let provider: SerializedProvider

    let errorHandler: ErrorHandler

    var body: some View {
        if let viewProvider = module as? any ProviderEntityViewProviding {
            AnyView(viewProvider.providerEntityView(
                with: provider,
                errorHandler: errorHandler,
                onSelect: onSelect
            ))
        } else {
            fatalError("Module got too far without being ProviderEntityViewProviding: \(module)")
        }
    }
}

private extension ProviderEntitySelector {
    func onSelect(_ entity: any ProviderEntity & Encodable) async throws {
        pp_log(.app, .info, "Select new provider entity: \(entity)")

        do {
            guard var moduleBuilder = module.providerModuleBuilder() else {
                assertionFailure("Module is not a ProviderModuleBuilder?")
                return
            }
            try moduleBuilder.setProviderEntity(entity)
            let newModule = try moduleBuilder.tryBuild()

            var builder = profile.builder()
            builder.saveModule(newModule)
            let newProfile = try builder.tryBuild()

            try await profileManager.save(newProfile, isLocal: true)

            // will reconnect via AppContext observation
        } catch {
            pp_log(.app, .error, "Unable to save new provider entity: \(error)")
            throw error
        }
    }
}