using Avalonia.Platform.Storage;
using Gommon;
using Ryujinx.Common.Utilities;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Ryujinx.Ava.Utilities
{
    public static class StorageProviderExtensions
    {
        extension(IStorageProvider storageProvider)
        {
            public Task<Optional<IStorageFolder>> OpenSingleFolderPickerAsync(FolderPickerOpenOptions openOptions = null) =>
                CoreDumpable(() => storageProvider.OpenFolderPickerAsync(FixOpenOptions(openOptions, false)))
                    .Then(folders => folders.FindFirst());

            public Task<Optional<IStorageFile>> OpenSingleFilePickerAsync(FilePickerOpenOptions openOptions = null) =>
                CoreDumpable(() => storageProvider.OpenFilePickerAsync(FixOpenOptions(openOptions, false)))
                    .Then(files => files.FindFirst());

            public Task<Optional<IReadOnlyList<IStorageFolder>>> OpenMultiFolderPickerAsync(FolderPickerOpenOptions openOptions = null) =>
                CoreDumpable(() => storageProvider.OpenFolderPickerAsync(FixOpenOptions(openOptions, true)))
                    .Then(folders => folders.Count > 0 ? Optional.Of(folders) : default);

            public Task<Optional<IReadOnlyList<IStorageFile>>> OpenMultiFilePickerAsync(FilePickerOpenOptions openOptions = null) =>
                CoreDumpable(() => storageProvider.OpenFilePickerAsync(FixOpenOptions(openOptions, true)))
                    .Then(files => files.Count > 0 ? Optional.Of(files) : default);
        }

        private static async Task<T> CoreDumpable<T>(Func<Task<T>> picker)
        {
            OsUtils.SetCoreDumpable(true);
            try
            {
                return await picker();
            }
            finally
            {
                if (!Program.CoreDumpArg)
                    OsUtils.SetCoreDumpable(false);
            }
        }

        private static FilePickerOpenOptions FixOpenOptions(this FilePickerOpenOptions openOptions, bool allowMultiple)
        {
            if (openOptions is null)
                return new FilePickerOpenOptions { AllowMultiple = allowMultiple };

            openOptions.AllowMultiple = allowMultiple;
            return openOptions;
        }

        private static FolderPickerOpenOptions FixOpenOptions(this FolderPickerOpenOptions openOptions, bool allowMultiple)
        {
            if (openOptions is null)
                return new FolderPickerOpenOptions { AllowMultiple = allowMultiple };

            openOptions.AllowMultiple = allowMultiple;
            return openOptions;
        }
    }
}