using System;
using System.IO;
using System.Threading.Tasks;
using Paca.App.Utils;
using Paca.Core.QuickActions;
using Xunit;

namespace Paca.Tests.App;

public class DownloadFolderOpenE2ERedScenarioTests
{
    private static readonly string SolutionRoot = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", ".."));

    [Fact]
    public void Test01_ExplorerLauncher_CreatesMissingFolder_And_LaunchesExplorerWithFolderPath()
    {
        string uniqueFolder = Path.Combine(Path.GetTempPath(), $"paca_e2e_folder_{Guid.NewGuid():N}");
        try
        {
            Assert.False(Directory.Exists(uniqueFolder), "Test directory should not exist prior to test");

            // Build start info for folder opening
            var psi = ExplorerLauncher.BuildProcessStartInfo(null, uniqueFolder);

            // 1. Directory must be created automatically on disk!
            Assert.True(Directory.Exists(uniqueFolder), "ExplorerLauncher should auto-create destination folder if missing");

            // 2. Must launch explorer.exe directly with quoted path argument
            Assert.Equal("explorer.exe", psi.FileName);
            Assert.Contains(uniqueFolder, psi.Arguments);
            Assert.True(psi.UseShellExecute);
        }
        finally
        {
            if (Directory.Exists(uniqueFolder)) Directory.Delete(uniqueFolder);
        }
    }

    [Fact]
    public void Test02_ExplorerLauncher_SelectedFile_LaunchesSelectArgument()
    {
        string uniqueFolder = Path.Combine(Path.GetTempPath(), $"paca_e2e_select_{Guid.NewGuid():N}");
        Directory.CreateDirectory(uniqueFolder);
        string testFile = Path.Combine(uniqueFolder, "test_video.mp4");
        File.WriteAllText(testFile, "dummy");

        try
        {
            var psi = ExplorerLauncher.BuildProcessStartInfo(testFile, uniqueFolder);
            Assert.Equal("explorer.exe", psi.FileName);
            Assert.Contains("/select,", psi.Arguments);
            Assert.Contains(testFile, psi.Arguments);
            Assert.True(psi.UseShellExecute);
        }
        finally
        {
            if (Directory.Exists(uniqueFolder)) Directory.Delete(uniqueFolder, true);
        }
    }

    [Fact]
    public async Task Test03_QuickAction_MediaOpenOutputFolder_ActuallyInvokesFolderOpener()
    {
        var catalog = new QuickActionCatalog();
        var action = catalog.GetAction("media.open_output_folder");
        Assert.NotNull(action);

        string? openedFolder = "NOT_CALLED";
        var ctx = new QuickActionContext(
            OutputFolder: @"C:\Downloads\Paca",
            FolderOpener: path => openedFolder = path
        );

        Assert.NotNull(action.Handler);
        var result = await action.Handler.Invoke(ctx);

        Assert.True(result.Success);
        // It must NOT just display a toast, it must invoke FolderOpener!
        Assert.Null(openedFolder); // FolderOpener(null) opens the output folder
    }

    [Fact]
    public void Test04_NewTabPage_OpenDownloadsMessage_CallsOpenInExplorer()
    {
        string mainCs = File.ReadAllText(Path.Combine(SolutionRoot, "src", "Paca.App", "MainWindow.xaml.cs"));
        Assert.Contains("case \"ntp:opendownloads\":", mainCs);
        
        // ntp:opendownloads must call OpenInExplorer(null) to open the real Windows Explorer folder
        int idx = mainCs.IndexOf("case \"ntp:opendownloads\":", StringComparison.OrdinalIgnoreCase);
        Assert.True(idx >= 0);
        string block = mainCs.Substring(idx, 200);
        Assert.Contains("OpenInExplorer(null)", block);
    }
}