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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
import os

struct FoundServer {
	let id: String
	let name: String
	let version: String

	let ptr: UnsafeMutablePointer<plac_app_server_selector_entry>
}

enum DiscoveryResult {
	case loading
	case loaded([FoundServer])
	case failed(plac_app_server_selector_state)
	case null_pointer
}

// https://oleb.net/blog/2015/06/c-callbacks-in-swift/
class Context<T> {
	private(set) var item: T

	init(_ item: T) {
		self.item = item
	}

	func mutate(_ mutation: (inout T) -> Void) {
		mutation(&item)
	}
}

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

	private var app: UnsafeMutablePointer<plac_app>

	init(_ app: UnsafeMutablePointer<plac_app>) {
		self.app = app
	}

	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 PLAC_APP_SERVER_SELECTOR_ERR_SOCKET:
						Text("Unable to operate on network socket")
					case PLAC_APP_SERVER_SELECTOR_ERR_UNEXPECTED:
						Text("Unexpected error")
					case PLAC_APP_SERVER_SELECTOR_ERR_THREAD_SPAWN:
						Text("Unable to spawn worker thread")
					case PLAC_APP_SERVER_SELECTOR_ERR_OUT_OF_MEMORY:
						Text("Out of memory")
					case PLAC_APP_SERVER_SELECTOR_ERR_SOCKET_PERMISSION:
						Text(
							"Permission rejected for network socket operation"
						)
					case PLAC_APP_SERVER_SELECTOR_ERR_NETWORK_UNAVAILABLE:
						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 {
				let context = Unmanaged.passRetained(Context(self))
				plac_app_server_selector_on_change(
					app.pointee.server_selector,
					{ ptr in
						DispatchQueue.main.async {
							let logger = Logger()

							guard let ptr = ptr else {
								logger.error(
									"Exiting server selector callback because context is NULL"
								)
								return
							}

							let ctx: Context<ServerDiscoveryScene> = Unmanaged.fromOpaque(ptr)
								.takeUnretainedValue()

							ctx.mutate { this in
								switch this.app.pointee.server_selector.pointee.state {
								case PLAC_APP_SERVER_SELECTOR_LOADING,
									PLAC_APP_SERVER_SELECTOR_REFRESHING,
									PLAC_APP_SERVER_SELECTOR_NOT_LOADED:
									this.discovery = .loading

								case PLAC_APP_SERVER_SELECTOR_LOADED:
									var servers: [FoundServer] = []

									var current = this.app.pointee.server_selector!.pointee
										.entries!

									for _
										in 0...this.app.pointee.server_selector.pointee.entries_len
									{
										if let server = current.pointee {
											servers.append(
												FoundServer(
													id: String(cString: server.pointee.id),
													name: String(cString: server.pointee.name),
													version: String(cString: server.pointee.version),
													ptr: server
												)
											)
										}
										current = current.successor()
									}

									this.discovery = .loaded(servers)
								default:
									this.discovery = .failed(
										this.app.pointee.server_selector.pointee.state
									)
								}
							}
						}
					},
					context.toOpaque()
				)

				plac_app_server_selector_load(self.app.pointee.server_selector)
			}
		}
	}
}