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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 PlacCore
import SwiftUI

enum DiscoveryResult {
	case loading
	case loaded([UnsafeMutablePointer<PlacCore.plac_server>])
	case failed(PlacCore.plac_scan_result_code)
	case nilscanner
}

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

	var body: some Scene {
		WindowGroup {
			VStack {
				switch discovery {
				case .loading:
					Text("Scanning Roon Server on network...")
				case .loaded(let serverPtrs):
					List {
						ForEach(serverPtrs, id: \.pointee.id) { ptr in
							Text(String.init(cString: ptr.pointee.name))
						}
					}
				case .failed(let plac_scan_result_code):
					switch plac_scan_result_code {
					case PlacCore.PLAC_SCAN_NETWORK_UNAVAILABLE:
						Text("Network unavailable")
					case PlacCore.PLAC_SCAN_UNKNOWN_ERROR:
						Text("Unknown error")
					case PlacCore.PLAC_SCAN_SOCKET_PERMISSION_ERROR:
						Text("Failed to open socket (permission error)")
					case PlacCore.PLAC_SCAN_SOCKET_SETUP_ERROR:
						Text("Failed to open socket")
					case PlacCore.PLAC_SCAN_INVALID_RECEIVE_WINDOW:
						Text("Invalid receiving window duration")
					case PlacCore.PLAC_SCAN_OK:
						Text("OK (unreachable)")
					case PlacCore.PLAC_SCAN_OUT_OF_MEMORY:
						Text("Out of memory")
					case PlacCore.PLAC_SCAN_UDP_RECV_ERROR:
						Text("Unabled to receive UDP message")
					case PlacCore.PLAC_SCAN_UDP_SEND_ERROR:
						Text("Unable to send UDP message")
					case PlacCore.PLAC_SCAN_TOO_MANY_SOCKET_ERROR:
						Text("Failed to open socket (too many socket)")
					case PlacCore.PLAC_SCAN_NULL_POINTER_ARGS:
						Text("Failed to setup scanner or options")
					default:
						Text("Unexpected error (platform misbehaving)")
					}
				case .nilscanner:
					Text("Failed to scan")
				}
			}
		}
		.onChange(of: scenePhase, initial: true) {
			if scenePhase == .active {
				let thread = Thread {
					switch discovery {
					case .loaded(let prevPointers):
						for pointer in prevPointers {
							PlacCore.plac_server_free(pointer)
						}
					default:
						break
					}

					discovery = .loading

					var opts = PlacCore.plac_server_scan_options()
					PlacCore.plac_server_scan_options_init(&opts)

					let scanner = PlacCore.plac_server_scanner_make()

					if let result = PlacCore.plac_server_scanner_scan(
						scanner, &opts)
					{
						var servers:
							[UnsafeMutablePointer<PlacCore.plac_server>] =
								[]

						while true {
							if let next =
								PlacCore.plac_scan_result_next(
									result)
							{
								servers.append(next)
							} else {
								break
							}
						}

						if result.pointee.code == PlacCore.PLAC_SCAN_OK {
							discovery = .loaded(servers)
						} else {
							discovery = .failed(result.pointee.code)
						}

						PlacCore.plac_scan_result_free(result)
					} else {
						discovery = .nilscanner
					}

					PlacCore.plac_server_scanner_free(scanner)
				}

				thread.start()
			}
		}
	}
}