using Htmx.ApiDemo;
using Htmx.ApiDemo.Templates.Components;
using Immediate.Apis.Shared;
using Immediate.Handlers.Shared;
using Microsoft.AspNetCore.Http;

namespace Htmx.ApiDemo.Templates;

public sealed class MainLayout : MainLayoutBase
{
    private byte[] _titleData     = [];
    private byte[] _appNameData   = [];
    private byte[] _pageTitleData = [];
    private byte[] _userSectionData = [];

    public IHtmxComponent Body { get; }

    public MainLayout(IHtmxComponent body, string title = "App", string appName = "MyApp",
                      string pageTitle = "Dashboard", string? userName = null, string? afToken = null)
    {
        Body           = body;
        _titleData     = title.ToUtf8Bytes();
        _appNameData   = appName.ToUtf8Bytes();
        _pageTitleData = pageTitle.ToUtf8Bytes();

        var afInput = string.IsNullOrEmpty(afToken)
            ? ""
            : $"""<input type="hidden" name="__RequestVerificationToken" value="{System.Web.HttpUtility.HtmlAttributeEncode(afToken)}" />""";

        _userSectionData = userName is not null
            ? $"""
               <div class="flex items-center gap-2">
                 <div class="flex h-9 w-9 items-center justify-center rounded-full bg-primary text-primary-foreground text-sm font-semibold select-none" title="{System.Web.HttpUtility.HtmlAttributeEncode(userName)}">
                   {System.Web.HttpUtility.HtmlEncode(GetInitials(userName))}
                 </div>
                 <form method="post" action="/logout">
                   {afInput}
                   <button type="submit"
                           class="inline-flex h-8 items-center rounded-md border border-input bg-transparent px-3 text-xs
                                  font-medium transition-colors hover:bg-accent hover:text-accent-foreground
                                  focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring">
                     Sign out
                   </button>
                 </form>
               </div>
               """.ToUtf8Bytes()
            : """
              <a href="/login"
                 class="inline-flex h-8 items-center rounded-md border border-input bg-transparent px-3 text-xs
                        font-medium transition-colors hover:bg-accent hover:text-accent-foreground
                        focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring">
                Sign in
              </a>
              """.ToUtf8Bytes();
    }

    private static string GetInitials(string name)
    {
        var parts = name.Trim().Split(' ', System.StringSplitOptions.RemoveEmptyEntries);
        return parts.Length >= 2
            ? $"{parts[0][0]}{parts[^1][0]}".ToUpperInvariant()
            : name.Length > 0 ? name[0].ToString().ToUpperInvariant() : "?";
    }

    protected override void RenderBody(HtmxRenderContext context)        => Body.Render(context);
    protected override void RenderTitle(HtmxRenderContext context)       => context.Writer.WriteUtf8(_titleData);
    protected override void RenderAppName(HtmxRenderContext context)     => context.Writer.WriteUtf8(_appNameData);
    protected override void RenderPageTitle(HtmxRenderContext context)   => context.Writer.WriteUtf8(_pageTitleData);
    protected override void RenderUserSection(HtmxRenderContext context) => context.Writer.WriteUtf8(_userSectionData);
}


[Handler]
[MapGet("/")]
public static partial class GetIndexHandler
{
    public class Command;

    private static ValueTask<IResult> HandleAsync(
        Command command,
        IHttpContextAccessor httpContextAccessor,
        CancellationToken token)
    {
        var context = httpContextAccessor.HttpContext
            ?? throw new InvalidOperationException("HttpContext is not available.");

        var greet  = new Greeting { Username = "Enciphered", Count = 0, GreetingId = Guid.NewGuid() };
        return ValueTask.FromResult<IResult>(context.WriteHtmxPage(greet, title: "Home", appName: "HtmxApp", pageTitle: "Home"));
    }
}