//
//  VehiclesArchive.swift
//  AutoCatCore
//
//  Created by Selim Mustafaev on 19.01.2025.
//  Copyright © 2025 Selim Mustafaev. All rights reserved.
//

import SwiftUI

public enum VehiclesArchiveError: LocalizedError {
    
    case filedCreateCsv
    
    public var errorDescription: String? {
        switch self {
        case .filedCreateCsv: "Failed to create csv data for vehicles"
        }
    }
}

public final class VehiclesArchive {
    
    let vehicles: [VehicleDto]
    
    public init(vehiles: [VehicleDto]) {
        
        self.vehicles = vehiles
    }
    
    func makeCsvString() throws -> String {
        
        var result = ""
        let newLine: Character = "\r\n"
        result.append(VehicleDto.csvHeader)
        result.append(newLine)
        
        for vehicle in vehicles {
            result.append(vehicle.csvLine)
            result.append(newLine)
        }
        
        return result
    }
}

extension VehiclesArchive: Transferable {
    
    public static var fileName: String {
        "autocat.csv"
    }
    
    public static var transferRepresentation: some TransferRepresentation {
        
        DataRepresentation(exportedContentType: .commaSeparatedText) { archive in
            
            let csvString = try archive.makeCsvString()
            if let data = csvString.data(using: .utf8){
                return data
            } else {
                throw VehiclesArchiveError.filedCreateCsv
            }
        }
        .suggestedFileName(fileName)
    }
}