import Foundation
@testable import NASBackup

final class MockNASService: NASTransferProtocol {
    var shouldFail: Bool = false
    var uploadDelay: TimeInterval = 0
    var fakeItems: [NASItem] = []
    var fileExistsAnswer: Bool = false

    private(set) var connectCalled = false
    private(set) var uploadCallCount = 0
    private(set) var lastUploadedPath: String?

    var isConnected: Bool = false

    func connect(to host: String, port: Int, username: String, password: String) async throws {
        connectCalled = true
        if shouldFail { throw MockError.connectionFailed }
        isConnected = true
    }

    func disconnect() { isConnected = false }

    func listDirectory(at path: String) async throws -> [NASItem] {
        if shouldFail { throw MockError.connectionFailed }
        return fakeItems
    }

    func createDirectory(at path: String) async throws {
        if shouldFail { throw MockError.connectionFailed }
    }

    func fileExists(at remotePath: String) async throws -> Bool { fileExistsAnswer }

    func upload(localURL: URL, remotePath: String, progress: @escaping (Int64, Int64) -> Void) async throws {
        if uploadDelay > 0 {
            try await Task.sleep(nanoseconds: UInt64(uploadDelay * 1_000_000_000))
        }
        if shouldFail { throw MockError.uploadFailed }
        progress(100, 100)
        uploadCallCount += 1
        lastUploadedPath = remotePath
    }
}

enum MockError: Error {
    case connectionFailed
    case uploadFailed
}