using System.Reflection;
using System.Text;
using System.Text.Json.Nodes;
using Connected.Interop;
using Connected.Net;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.WebUtilities;

namespace Connected.Rest;

internal class FormFormatter : ApiFormatter
{
	public const string ContentType = "application/x-www-form-urlencoded";
	protected override async Task<JsonNode?> OnParseArguments()
	{
		using var reader = new StreamReader(Context.Request.Body, Encoding.UTF8);
		var body = await reader.ReadToEndAsync();
		var qs = QueryHelpers.ParseNullableQuery(body);
		var result = new JsonObject();

		foreach (var q in qs)
			result.Add(q.Key, JsonValue.Create(q.Value));

		Context.SetRequestArguments(result);

		return result;
	}

	protected override async Task OnRenderResult(object content)
	{
		if (Context.Response.HasStarted)
		{
			var qs = new QueryString();

			if (content is not null)
			{
				foreach (var property in content.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance))
				{
					if (!property.PropertyType.IsTypePrimitive())
						continue;

					qs.Add(property.Name.ToCamelCase(), property.GetValue(content) as string);
				}
			}

			var buffer = Encoding.UTF8.GetBytes(qs.ToUriComponent());

			Context.Response.Clear();
			Context.Response.ContentLength = buffer.Length;
			Context.Response.ContentType = ContentType;
			Context.Response.StatusCode = StatusCodes.Status200OK;

			await Context.Response.Body.WriteAsync(buffer);
		}

		await Context.Response.CompleteAsync();
	}

	protected override async Task OnRenderError(int statusCode, string message)
	{
		Context.Response.ContentType = ContentType;
		Context.Response.StatusCode = statusCode;

		var qs = new QueryString();

		qs.Add("message", message);

		var buffer = Encoding.UTF8.GetBytes(qs.ToUriComponent());

		Context.Response.ContentLength = buffer.Length;

		await Context.Response.Body.WriteAsync(buffer);
		await Context.Response.CompleteAsync();
	}
}