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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 os

protocol Server {
	var id: String { get }
	var name: String { get }
	var version: String { get }
}

class CoreServer: Identifiable, Server {
	var ptr: UnsafeMutablePointer<PlacKit.plac_discovery_server>

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

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

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

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

	deinit {
		PlacKit.plac_discovery_server_release(ptr)
	}
}

class MockServer: Identifiable, Server {
	var id: String
	var name: String
	var version: String

	init(id: String, name: String, version: String) {
		self.id = id
		self.name = name
		self.version = version
	}
}

class ScanResult {
	let logger = Logger()

	var ptr: UnsafeMutablePointer<PlacKit.plac_discovery_scan_result>

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

	var entries: [CoreServer]

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

		var entries: [CoreServer] = []

		if ptr.pointee.code == PlacKit.PLAC_DISCOVERY_SCAN_RESULT_OK {
			if ptr.pointee.servers_len == 0 {
				logger.info("Server not found")
				self.entries = []
				return
			}

			let current = ptr.pointee.servers_ptr?.pointee
			guard var current = current else {
				logger.warning("servers_ptr is null")
				self.entries = []
				return
			}

			for _ in 0..<ptr.pointee.servers_len {
				entries.append(
					CoreServer(ptr: PlacKit.plac_discovery_server_retain(current))
				)
				current = current.successor()
			}
		}

		self.entries = entries
	}

	deinit {
		PlacKit.plac_discovery_scan_result_release(ptr)
	}
}