namespace Fab;
public class Fabricator
{
    public Fabricator(FabricatorOptions options)
    {
        System.Console.WriteLine("Command: "+ options.Command);
        System.Console.WriteLine("Number: "+ options.Number);
        System.Console.Write("Data:\n\t");
        foreach (var datatype in options.Data)
        {
            System.Console.Write(datatype+" ");
        }
        System.Console.WriteLine();
        System.Console.WriteLine("File Name: "+ options.FileName);
        System.Console.WriteLine("File Format: "+ options.FileFormat);
        System.Console.Write("Headers:\n\t");
        foreach (var header in options.Headers)
        {
            System.Console.Write(header+" ");
        }
        System.Console.WriteLine();
        System.Console.WriteLine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile));
        
    }
}

public class FabricatorOptions
{

    public int Number { get; set; } = 1;
    public string Command { get; set; } = "";
    public string FileFormat { get; set; } = "stdout";
    public string FileName { get; set; } = "";
    public string[] Headers { get; set; } = [];
    public string[] Data { get; set; } = [];
    private readonly string[] AcceptedCommands = {
        "gen"
    };

    public FabricatorOptions(string Command, Dictionary<string, string> options, string data)
    {
        if(!AcceptedCommands.Contains(Command)){
            //TODO(Eero): Print help page instead.
            throw new Exception($"Invalid command: \"{Command}\".");
        }
        this.Command = Command;
        ParseOptions(options);
        Data = ParseData(data);
        if(Headers.Length == 0)
            ParseDefaultHeaders(); 
    }

    private void ParseDefaultHeaders()
    {
        List<string> headerList = new List<string>();
        foreach (var dataType in Data)
        {
            switch (dataType)
            {
                case "name":
                    headerList.Add("Name");
                    break;
                case "phone":
                    headerList.Add("PhoneNumber");
                    break;
                case "address":
                    headerList.Add("Address");
                    break;
                default:
                    throw new Exception($"Invalid data type for data \"{dataType}\"");
            }
        }
        Headers = headerList.ToArray();
    }

    private string[] ParseData(string data)
    {
        //TODO(Eero): Parse by supported data type
        return data.Split(":").ToArray<string>();
    }

    private void ParseOptions(Dictionary<string, string> options)
    {
        foreach (var (key, value) in options)
        {
            switch (key)
            {
                case "-n":
                    Number = int.Parse(value);
                    break;
                case "-f":
                    FileFormat = value.ToLower();
                    break;
                case "-o":
                    FileName = value.Trim();
                    break;
                case "-h":
                    Headers = value.Split(":").ToArray<string>();
                    break;
                default:
                    throw new Exception($"Invalid option \"{key}\".");
            }            
        }
    }
}