namespace Dpz.Core.WebApi.Middleware;

/// <summary>
/// 处理HTTP响应中间件
/// </summary>
public class HttpResponseHeaderHandel
{
    private readonly RequestDelegate _next;

    /// <summary>
    ///
    /// </summary>
    /// <param name="next"></param>
    public HttpResponseHeaderHandel(RequestDelegate next)
    {
        _next = next;
    }

    /// <summary>
    ///
    /// </summary>
    /// <param name="httpContext"></param>
    /// <returns></returns>
    public async Task Invoke(HttpContext httpContext)
    {
        /*
         * from https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Expose-Headers
         * 列出哪些 http response headers 对外暴露
         * 这里设置为所有
         */
        httpContext.Response.Headers.Append("Access-Control-Expose-Headers", "*");
        if (
            httpContext.Request.Path.Equals("/swagger", StringComparison.OrdinalIgnoreCase)
            || httpContext.Request.Path.Equals(
                "/swagger/index.html",
                StringComparison.OrdinalIgnoreCase
            )
        )
        {
            httpContext.Response.Redirect("/scalar/v1", true);
            return;
        }

        // if (
        //     string.Equals(
        //         httpContext.Request.Query["format"],
        //         "xml",
        //         StringComparison.OrdinalIgnoreCase
        //     )
        // )
        // {
        //     httpContext.Response.ContentType = "application/xml";
        // }
        if (
            string.Equals(
                httpContext.Request.Query["format"],
                "msgpack",
                StringComparison.OrdinalIgnoreCase
            )
        )
        {
            httpContext.Response.ContentType = "application/x-msgpack";
        }

        await _next.Invoke(httpContext);

        if (httpContext.Response.StatusCode == 401)
        {
            httpContext.Response.Headers.WWWAuthenticate =
                "Bearer realm=\"api\" error=\"invalid_token\"";
        }
    }
}