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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 PlacKit
import SwiftUI
import os

enum DiscoveryResult {
	case loading
	case loaded([Server])
	case failed(PlacKit.plac_discovery_scan_result_code)
	case null_pointer
}

struct ServerDiscoveryScene: Scene {
	@Environment(\.scenePhase) private var scenePhase
	@State private var discovery: DiscoveryResult = .loading

	private let logger = Logger()
	private let queue = DispatchQueue(label: "plac.server-discovery")

	var body: some Scene {
		WindowGroup {
			VStack {
				switch self.discovery {
				case .loading:
					Text("Scanning Roon Server on network...")
				case .loaded(let servers):
					List {
						ForEach(servers, id: \.id) { server in
							Text(server.name)
						}
					}
				case .failed(let plac_scan_result_code):
					switch plac_scan_result_code {
					case PlacKit.PLAC_DISCOVERY_SCAN_RESULT_SOCKET_ERROR:
						Text("Unable to operate on network socket")
					case PlacKit.PLAC_DISCOVERY_SCAN_RESULT_UNKNOWN:
						Text("Unexpected error")
					case PlacKit.PLAC_DISCOVERY_SCAN_RESULT_OUT_OF_MEMORY:
						Text("Out of memory")
					case PlacKit.PLAC_DISCOVERY_SCAN_RESULT_SOCKET_PERMISSION_DENIED:
						Text(
							"Permission rejected for network socket operation"
						)
					case PlacKit.PLAC_DISCOVERY_SCAN_RESULT_SOCKET_PERMISSION_DENIED:
						Text("Network unavailable")
					default:
						Text("Unexpected error (platform misbehaving)")
					}
				case .null_pointer:
					Text("Out of memory")
				}
			}
		}
		.onChange(of: scenePhase, initial: true) {
			if self.scenePhase == .active {
				queue.async {
					let ptr = PlacKit.plac_discovery_scan()
					guard let ptr = ptr else {
						logger.error("Failed to scan servers: Out of memory")
						DispatchQueue.main.async {
							discovery = .null_pointer
						}
						return
					}

					let result = ScanResult(ptr: ptr)

					if result.code != PlacKit.PLAC_DISCOVERY_SCAN_RESULT_OK {
						DispatchQueue.main.async {
							discovery = .failed(result.code)
						}
						return
					}

					discovery = .loaded(result.entries)
				}
			}
		}
	}
}