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// Copyright 2025 Shota FUJI
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0

import RoonKit
import SwiftUI

/// SwitUI's Commands are not designed to pass State or such via initializer.
/// In doing that so, closures capture the environment thus leaks passed States.
/// As `FocusedValue` cannot mutate the value itself, this class wraps the model
/// object and mimics state manipulation.
@MainActor
@Observable
private final class ConnectionDataModelWrapper {
	var model: ConnectionDataModel?

	init(_ model: ConnectionDataModel? = nil) {
		self.model = model
	}
}

private struct ConnectionCommands: Commands {
	@FocusedValue(ConnectionDataModelWrapper.self) private var model:
		ConnectionDataModelWrapper?

	var body: some Commands {
		CommandGroup(after: .appInfo) {
			Button("Disconnect", systemImage: "powercode") {
				model?.model = nil
			}
			.disabled(model?.model == nil)
		}
	}
}

@main
struct PlacApp: App {
	@State private var model: ConnectionDataModelWrapper =
		ConnectionDataModelWrapper(Self.storedConnection())

	private static func storedConnection() -> ConnectionDataModel? {
		// Xcode Previews feature compiles and *runs* whole application.
		// Because Plac saves and restores from UserDefaults, the background instance
		// connects to Roon Server using the saved ID/host/port/token. The worst
		// part is running the app does not immediately terminate the background
		// instance--so there will be two app connecting to same destination using
		// same token. Roon Server drops the first connection, then the background
		// instance retries, then running instance dropped, then running instance
		// retries, so on... This results in endless connection loop.
		//
		// Below "guard" prevents that shitty "feature" from kicking in. An additional
		// bonus is, Preview loading performance is much better with this guard.
		#if DEBUG
			if ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"]
				== "1"
			{
				return ConnectionDataModel(failingWith: .cancelled)
			}
		#endif

		let port = UserDefaults.standard.integer(forKey: StorageKeys.serverPort)

		guard
			let serverID = UserDefaults.standard.string(
				forKey: StorageKeys.serverID
			),
			let host = UserDefaults.standard.string(forKey: StorageKeys.serverHost),
			port > 0
		else {
			return nil
		}

		return ConnectionDataModel(
			serverID: serverID,
			host: host,
			port: UInt16(port),
			token: UserDefaults.standard.string(forKey: StorageKeys.extensionToken),
			onConnect: { token in
				Self.saveToken(token)
			}
		)
	}

	private static func saveConnection(
		serverID: String? = nil,
		host: String? = nil,
		port: UInt16? = nil
	) {
		UserDefaults.standard.set(serverID, forKey: StorageKeys.serverID)
		UserDefaults.standard.set(host, forKey: StorageKeys.serverHost)
		UserDefaults.standard.set(Int(port ?? 0), forKey: StorageKeys.serverPort)
	}

	private static func saveToken(_ token: String? = nil) {
		UserDefaults.standard.set(token, forKey: StorageKeys.extensionToken)
	}

	var body: some Scene {
		WindowGroup("Plac", id: "main-window") {
			if let model = model.model {
				ConnectionScreen(
					model: model,
					onDisconnect: {
						self.model.model = nil
						Self.saveToken()
						Self.saveConnection()
					},
					onReconnect: {
						self.model.model = ConnectionDataModel(
							model,
							onConnect: { token in
								Self.saveToken(token)
							}
						)
					},
					onCancel: {
						self.model.model = ConnectionDataModel(cancelling: model)
					}
				)
				.focusedSceneValue(self.model)
			} else {
				ServerDiscoveryScreen()
					.onConnect { server in
						self.model.model = ConnectionDataModel(
							serverID: server.id,
							host: server.host,
							port: server.port,
							onConnect: { token in
								Self.saveToken(token)
							}
						)

						Self.saveToken()
						Self.saveConnection(
							serverID: server.id,
							host: server.host,
							port: server.port
						)
					}
			}
		}
		.commands {
			ConnectionCommands()
		}
		.defaultSize(width: 800, height: 600)
	}
}