using OwlCore.AbstractUI.Models;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
using Vestris.ResourceLib;
using ZuneModCore.Win32;

namespace ZuneModCore.Mods;

public class BackgroundImageMod : Mod
{
    private const string Description = "Replaces the \"Zero\" background with an image of your choice.";

    private const string Author = "Joshua \"Yoshi\" Askharoun";

    public override ModMetadata Metadata => new(nameof(BackgroundImageMod), "Background Image",
        Description, Author, new(1, 0));

    public override AbstractUICollection? GetDefaultOptionsUI()
    {
        AbstractUICollection optionsUi = new(nameof(BackgroundImageMod))
        {
            new AbstractTextBox("fileBox", Environment.GetFolderPath(Environment.SpecialFolder.MyPictures)),
        };
        optionsUi.Title = "select background";
        optionsUi.Subtitle = "CHOOSE A BACKGROUND IMAGE OF YOUR CHOICE.";
        return optionsUi;
    }

    public override IReadOnlyList<Type>? DependentMods => null;

    public override async Task<string?> Apply()
    {
        string bgimgPath = ((AbstractTextBox)OptionsUI![0]).Value;
        FileInfo bgimgInfo = new(bgimgPath);
        if (!bgimgInfo.Exists)
        {
            return $"The file '{bgimgInfo.FullName}' does not exist.";
        }

        FileInfo zsrDllInfo = new(Path.Combine(ZuneInstallDir, "ZuneShellResources.dll"));
        if (!zsrDllInfo.Exists)
        {
            return $"The file '{zsrDllInfo.FullName}' does not exist.";
        }

        // Make a backup if it doesn't already exist
        FileInfo zsrDllBackupInfo = new(Path.Combine(StorageDirectory, "ZuneShellResources.original.dll"));
        if (!zsrDllBackupInfo.Exists)
        {
            File.Copy(zsrDllInfo.FullName, zsrDllBackupInfo.FullName, true);
        }

        string zsrDllTempPath = Path.Combine(StorageDirectory, zsrDllInfo.Name);

        // Take ownership of DLL
        TokenManipulator.TakeOwnership(zsrDllInfo);

        try
        {
            using (ResourceInfo vi = new())
            {
                // Load the RCDATA section
                vi.Load(zsrDllInfo.FullName);
                ResourceId? resId = vi.ResourceTypes.Find(id =>
                {
                    // This must be wrapped in a try-catch block,
                    // otherwise resourcelib will error when attempting
                    // to read the WAVE type (or any other non-default type).
                    try
                    {
                        return id.ResourceType == Kernel32.ResourceTypes.RT_RCDATA;
                    }
                    catch
                    {
                        return false;
                    }
                });
                if (resId == null)
                    return $"Failed to locate image resources in Zune software.";

                // Locate the image resource
                // TODO: Allow users to specify which background they want to replace
                List<Resource> RCDATA = vi.Resources[resId];
                int idx = RCDATA.FindIndex(r => r.Name.Name == "FRAMEBACKGROUND06.PNG");
                if (idx < 0)
                    return $"Failed to locate background image resource in Zune software.";
                GenericResource ogRes = (GenericResource)RCDATA[idx];

                // Replace image
                byte[] data = await File.ReadAllBytesAsync(bgimgInfo.FullName);
                BitmapResource newRes = new(IntPtr.Zero, IntPtr.Zero, resId, ogRes.Name, ogRes.Language, data.Length);
                newRes.Bitmap = new(data);
                RCDATA[idx] = newRes;
                File.Copy(zsrDllInfo.FullName, zsrDllTempPath, true);
                newRes.SaveTo(zsrDllTempPath);
            }
            File.Copy(zsrDllTempPath, zsrDllInfo.FullName, true);

            return null;
        }
        catch (IOException)
        {
            return $"Unable to replace '{zsrDllInfo.FullName}'. Verify that the Zune software is not running and try again.";
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.ToString());
            return ex.Message;
        }
    }

    public override Task<string?> Reset()
    {
        try
        {
            // Copy backup to application folder
            File.Copy(Path.Combine(StorageDirectory, "ZuneShellResources.original.dll"),
                Path.Combine(ZuneInstallDir, "ZuneShellResources.dll"), true);

            return Task.FromResult<string?>(null);
        }
        catch (Exception ex)
        {
            return Task.FromResult(ex.Message)!;
        }
    }
}