import Foundation

enum LeadPDFUploadResult: Sendable {
    case uploaded
    case simulated
}

@MainActor
protocol LeadSignedPDFUploadService {
    var isSimulation: Bool { get }
    func upload(_ files: [URL], leadID: String, offerID: String, salesCode: String) async throws -> LeadPDFUploadResult
}

/// UI demonstration until the PDF upload endpoint is available. Sends no data.
struct StubLeadSignedPDFUploadService: LeadSignedPDFUploadService {
    let isSimulation = true
    var delay: Duration = .seconds(2)

    func upload(_ files: [URL], leadID: String, offerID: String, salesCode: String) async throws -> LeadPDFUploadResult {
        guard !files.isEmpty, files.allSatisfy({ FileManager.default.fileExists(atPath: $0.path) }) else {
            throw PDFSigningError.invalidDocument
        }
        try await Task.sleep(for: delay)
        try Task.checkCancellation()
        return .simulated
    }
}