using Microsoft.AspNetCore.Http;

namespace Htmx.ApiDemo;

/// <summary>
/// IResult implementation for rendering Htmx components as HTML or issuing redirects.
/// Defined as user code (not source-generated) so that RequestDelegateGenerator can
/// see it and emit NativeAOT-safe endpoint interceptors for lambdas returning this type.
/// </summary>
public readonly struct HtmxResult : IResult
{
    private readonly IHtmxComponent? _component;
    private readonly string? _redirectUrl;

    public HtmxResult(IHtmxComponent component) { _component = component; _redirectUrl = null; }
    public HtmxResult(string redirectUrl)        { _component = null; _redirectUrl = redirectUrl; }

    public Task ExecuteAsync(HttpContext context)
    {
        if (_redirectUrl is not null)
        {
            context.Response.Redirect(_redirectUrl);
            return Task.CompletedTask;
        }

        context.Response.ContentType = "text/html; charset=utf-8";
        var writerContext = new HtmxRenderContext(context.Response.BodyWriter);
        _component!.Render(writerContext);
        return Task.CompletedTask;
    }
}