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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 Foundation
import RoonKit
import SwiftUI

enum ConnectionState {
	case loading
	case open(Communicatable & Connectable, (String, UInt16))
	case closed
	case error(any Error)
}

private enum ServerQuery {
	case id(String)
	case info(Server)
}

@Observable
final class ConnectionDataModel {
	@ObservationIgnored
	@AppStorage("PlacApp.connectedServerId")
	private var connectedServerID: String?

	@ObservationIgnored @AppStorage("PlacApp.token")
	private var savedToken: String?

	@ObservationIgnored @AppStorage("PlacApp.serverIp")
	private var serverIp: String?

	@ObservationIgnored @AppStorage("PlacApp.serverPort")
	private var serverPort: Int?

	var state: ConnectionState = .closed

	var disconnectable: Bool {
		switch state {
		case .open(_, _):
			true
		default:
			false
		}
	}

	private let server: ServerQuery

	/// Initialize data model with server ID, let the model resolve host and port.
	///
	/// Model might use cached host/port to skip UDP mutlicast.
	init(serverID: String) {
		self.server = .id(serverID)
	}

	/// Initialize data model with resolved server.
	///
	/// Model do not perform server discovery.
	init(server: Server) {
		self.server = .info(server)
	}

	func connect() async {
		if case .loading = state {
			return
		}

		do {
			state = .loading

			let serverID: String
			let host: String
			let port: UInt16
			switch server {
			case .id(let id):
				serverID = id

				if connectedServerID != .some(id) {
					clearCache()
				} else if let serverIp = serverIp, let serverPort = serverPort {
					host = serverIp
					port = UInt16(serverPort)
					break
				}

				let server = try await Server(id: id)

				host = server.host
				port = server.port
			case .info(let server):
				if connectedServerID != .some(server.id) {
					clearCache()
				}

				serverID = server.id
				host = server.host
				port = server.port
			}

			let ext = RegistryService.Extension(
				id: "jp.pocka.plac.macos",
				displayName: "Plac macOS",
				version: "0.0.1",
				publisher: "Shota FUJI",
				email: "pockawoooh@gmail.com",
				requiredServices: [
					TransportService.id, BrowseService.id, ImageService.id,
				],
				token: savedToken,
			)

			let conn = try await Connection(
				id: serverID,
				host: host,
				port: port,
				ext: ext
			)

			state = .open(conn, (host, port))

			connectedServerID = serverID
			serverIp = host
			serverPort = Int(port)
			savedToken = await conn.token

			await conn.lifetime()

			state = .closed
		} catch {
			state = .error(error)
		}
	}

	func disconnect() async {
		switch state {
		case .open(let conn, _):
			await conn.disconnect()
			clearCache()
			state = .closed
		case .loading:
			return
		default:
			state = .closed
		}
	}

	func imageURL(req: ImageService.GetRequest) -> URL? {
		switch state {
		case .open(_, let (host, port)):
			URL(roonImage: req, host: host, port: port)
		default:
			nil
		}
	}

	private func clearCache() {
		connectedServerID = nil
		savedToken = nil
		serverIp = nil
		serverPort = nil
	}
}