using System.Net;
using System.Text;

namespace Server;

class Program
{
    static void Main()
    {
        // create server
        HttpListener listener = new();
        // routes need to be added first
        listener.Prefixes.Add("http://localhost:5000/api/login/");
        listener.Prefixes.Add("http://localhost:5000/api/register/");
        listener.Prefixes.Add("http://localhost:5000/api/posts/");
        listener.Prefixes.Add("http://localhost:5000/api/posts/like/");
        listener.Prefixes.Add("http://localhost:5000/api/posts/unlike/");
        listener.Prefixes.Add("http://localhost:5000/api/comment/");
        listener.Prefixes.Add("http://localhost:5000/api/profile/");
        listener.Prefixes.Add("http://localhost:5000/api/profile/experience/");
        listener.Prefixes.Add("http://localhost:5000/api/profile/education/");
        // listen
        listener.Start();
        Console.WriteLine("Server is listening on http://localhost:5000/");
        while (true)
        {
            HttpListenerContext context = listener.GetContext();
            HttpListenerRequest request = context.Request;
            HttpListenerResponse response = context.Response;
            response.Headers.Add("Access-Control-Allow-Origin", "http://localhost:5173");
            response.Headers.Add("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
            response.Headers.Add("Access-Control-Allow-Headers", "Content-Type, Authorization");

            // url after localhost:5000/
            string uri;
            if (request != null && request.Url != null)
                uri = request.Url.AbsolutePath;
            else
                return;
            switch (request.HttpMethod)
            {
                case "GET":
                    HandleGet(uri, request, response);
                    break;
                case "POST":
                    HandlePost(uri, request, response);
                    break;
                case "DELETE":
                    HandleDelete(uri, request, response);
                    break;
                case "PUT":
                    HandlePut(uri, request, response);
                    break;
                default:
                    HandleMissingPath(response);
                    break;
            }
        }
    }

    private static void HandlePut(
        string uri,
        HttpListenerRequest request,
        HttpListenerResponse response
    )
    {
        if (request.HasEntityBody)
            switch (uri)
            {
                case "/api/profile":
                    UpdateProfile.HandleRequest(request, response);
                    break;
                case "/api/education":
                    UpdateEducation.HandleRequest(request, response);
                    break;
                case "/api/experience":
                    UpdateExperience.HandleRequest(request, response);
                    break;
                case "/api/post":
                    UpdatePost.HandleRequest(request, response);
                    break;
                case "/api/comment":
                    UpdateComment.HandleRequest(request, response);
                    break;
                case "/api/posts/like":
                    UpdatePost.HandleLikes(request, response);
                    break;
                // case "/api/posts/unlike":
                //     RemoveLike.HandleRequest(request, response);
                //     break;
                default:
                    HandleMissingPath(response);
                    break;
            }
        else
        {
            HandleMissingPath(response);
        }
    }

    private static void HandleDelete(
        string uri,
        HttpListenerRequest request,
        HttpListenerResponse response
    )
    {
        if (request.HasEntityBody)
            switch (uri)
            {
                case "/api/profile":
                    DeleteProfile.HandleRequest(request, response);
                    break;
                case "/api/profile/education":
                    DeleteEducation.HandleRequest(request, response);
                    break;
                case "/api/profile/experience":
                    DeleteExperience.HandleRequest(request, response);
                    break;
                case "/api/posts":
                    DeletePost.HandleRequest(request, response);
                    break;
                case "/api/comment":
                    DeleteComment.HandleRequest(request, response);
                    break;
                default:
                    HandleMissingPath(response);
                    break;
            }
        else
        {
            HandleMissingPath(response);
        }
    }

    private static void HandlePost(
        string uri,
        HttpListenerRequest request,
        HttpListenerResponse response
    )
    {
        if (request.HasEntityBody)
            switch (uri)
            {
                case "/api/profile":
                    CreateProfile.HandleRequest(request, response);
                    break;
                case "/api/profile/education":
                    CreateEducation.HandleRequest(request, response);
                    break;
                case "/api/profile/experience":
                    CreateExperience.HandleRequest(request, response);
                    break;
                case "/api/posts":
                    CreatePost.HandleRequest(request, response);
                    break;
                case "/api/comment":
                    CreateComment.HandleRequest(request, response);
                    break;
                case "/api/register":
                    Register.HandleRequest(request, response);
                    break;
                case "/api/login":
                    Login.HandleRequest(request, response);
                    break;
                default:
                    HandleMissingPath(response);
                    break;
            }
        else
        {
            HandleMissingPath(response);
        }
    }

    private static void HandleGet(
        string uri,
        HttpListenerRequest request,
        HttpListenerResponse response
    )
    {
        switch (uri)
        {
            default:
                HandleMissingPath(response);
                break;
        }
    }

    private static void HandleMissingPath(HttpListenerResponse response)
    {
        response.StatusCode = 404;
        string errorMessage = "Not Found";
        byte[] buffer = Encoding.UTF8.GetBytes(errorMessage);
        response.ContentType = "text/plain";
        response.ContentLength64 = buffer.Length;
        response.OutputStream.Write(buffer, 0, buffer.Length);
        response.OutputStream.Write(buffer, 0, buffer.Length);
    }
}