using System;
using System.Globalization;
using Avalonia.Data;
using Avalonia.Data.Converters;
using Ocarina2.Models;

namespace Ocarina2.Converter;

public class SongMetadataConverter:IValueConverter
{
    /*
        OCARINA2 Open-source music player and library manager
        Copyright (C) 2023 Matyáš Caras

        This program is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program.  If not, see <https://www.gnu.org/licenses/>.
     */
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if(!int.TryParse(parameter as string,out var p)) return new BindingNotification(new InvalidCastException(), BindingErrorType.Error); // get int param
        // for null return placeholders
        if (value == null && p == 1) return "Nothing";
        if (value == null && p == 2) return "Start playing something...";
        
        if (value is MusicFile m)
        {
            if (p == 1)
            {
                return m.Metadata.Tag.Title;
            }

            return m.Metadata.Tag.FirstPerformer == ""?"Unknown":m.Metadata.Tag.FirstPerformer;
        }
        return new BindingNotification(new InvalidCastException(), BindingErrorType.Error);
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}