/// Process an image and return the first table detected
    func extractTable(from image: Data) async throws -> DocumentObservation.Container.Table {

        // The Vision request.
        let request = RecognizeDocumentsRequest()

        // Perform the request on the image data and return the results.
        let observations = try await request.perform(on: image)

        // Get the first observation from the array.
        guard let document = observations.first?.document else {
            throw AppError.noDocument
        }

        // Extract the first table detected.
        guard let table = document.tables.first else {
            throw AppError.noTable
        }

        return table
    }

    /// Extract name, email addresses, and phone number from a table into a list of contacts.
    private func parseTable(_ table: DocumentObservation.Container.Table) {
        var foundItems = [Contact]()

        // Iterate over each row in the table.
        for row in table.rows {
            // The contact name will be taken from the first column.
            guard let firstCell = row.first else {
                continue
            }
            // Extract the text content from the transcript.
            let name = firstCell.content.text.transcript

            // Look for emails and phone numbers in the remaining cells.
            var detectedPhone: String? = nil
            var detectedEmail: String? = nil

            for cell in row.dropFirst() {
                // Get all detected data in the cell, then match emails and phone numbers.
                let allDetectedData = cell.content.text.detectedData
                for data in allDetectedData {
                    switch data.match.details {
                    case .emailAddress(let email):
                        detectedEmail = email.emailAddress
                    case .phoneNumber(let phoneNumber):
                        detectedPhone = phoneNumber.phoneNumber
                    default:
                        break
                    }
                }
            }
            // Create a contact if an email was detected.
            if let email = detectedEmail {
                let contact = Contact(name: name, email: email, phoneNumber: detectedPhone)
                foundItems.append(contact)
            }
        }
        contacts = foundItems
    }