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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 Observation
import PlacKit
import os

class ConnectionErrorEvent {
	var ptr: UnsafeMutablePointer<PlacKit.plac_connection_connection_error_event>

	var code: PlacKit.plac_connection_connection_error {
		return ptr.pointee.code
	}

	init(
		ptr: UnsafeMutablePointer<PlacKit.plac_connection_connection_error_event>
	) {
		self.ptr = ptr
	}

	deinit {
		PlacKit.plac_connection_connection_error_event_release(ptr)
	}
}

class ConnectedEvent {
	var ptr: UnsafeMutablePointer<PlacKit.plac_connection_connected_event>

	var token: String {
		return String(cString: ptr.pointee.token)
	}

	init(ptr: UnsafeMutablePointer<PlacKit.plac_connection_connected_event>) {
		self.ptr = ptr
	}

	deinit {
		PlacKit.plac_connection_connected_event_release(ptr)
	}
}

enum ConnectionEvent {
	case connectionError(ConnectionErrorEvent)
	case connected(ConnectedEvent)
	case zoneList(ZoneListEvent)
}

@Observable
class Connection {
	let logger = Logger()

	var ptr: UnsafeMutablePointer<PlacKit.plac_connection>

	init(server: CoreServer, token: String? = nil) {
		self.ptr = PlacKit.plac_connection_make(server.ptr, token)
	}

	init(ptr: UnsafeMutablePointer<PlacKit.plac_connection>) {
		self.ptr = ptr
	}

	deinit {
		PlacKit.plac_connection_release(ptr)
	}

	func getEvent() -> ConnectionEvent? {
		guard let ev = PlacKit.plac_connection_get_event(ptr) else {
			logger.warning("plac_connection_get_event returned a null pointer")
			return nil
		}

		switch ev.pointee.kind {
		case PlacKit.PLAC_CONNECTION_EVENT_ERROR:
			let ptr = PlacKit.plac_connection_event_get_connection_error_event(ev)
			return .connectionError(
				ConnectionErrorEvent(
					ptr: PlacKit.plac_connection_connection_error_event_retain(ptr)
				)
			)
		case PlacKit.PLAC_CONNECTION_EVENT_CONNECTED:
			let ptr = PlacKit.plac_connection_event_get_connected_event(ev)
			return .connected(
				ConnectedEvent(ptr: PlacKit.plac_connection_connected_event_retain(ptr))
			)
		case PlacKit.PLAC_CONNECTION_EVENT_ZONE_LIST:
			let ptr = PlacKit.plac_connection_event_get_zone_list_event(ev)
			return .zoneList(
				ZoneListEvent(ptr: PlacKit.plac_transport_zone_list_event_retain(ptr))
			)
		default:
			// Unreachable, this is here due to Swift's poor exhaustive check
			logger.warning("Unknown event kind: \(ev.pointee.kind.rawValue)")
			return nil
		}
	}

	func subscribeZoneChanges() {
		PlacKit.plac_connection_subscribe_zones(ptr)
	}

	func close() {
		PlacKit.plac_connection_disconnect(ptr)
	}
}