VWeb/Includes/Router.h

#pragma once

#include "Route.h"

#include <functional>
#include <memory>

namespace VWeb {
typedef std::function<bool(Request &, Response &)> RouteFunction;
typedef std::function<std::shared_ptr<Route>()> RouteInstaniateFunction;

struct RouteTree {
  void Add(const std::string &path, uint32_t allowedMethods,
           RouteInstaniateFunction instaniate);
  Ref<Route> Find(const std::string &path, Request &request);

protected:
  struct Node {
    explicit Node(const uint64_t id) : ID(id) {}
    std::unordered_map<std::string, std::unique_ptr<Node>> Children{};
    uint64_t ID{0};
  };
  Node Root{0};
  uint64_t m_NodeID = 1;
  struct RouteInstance {
    uint32_t AllowedMethods = HttpMethod::OPTIONS | HttpMethod::HEAD;
    RouteInstaniateFunction Instaniate;
  };
  std::unordered_map<uint64_t, RouteInstance> m_Routes;
};

class Router {
public:
  Router();

  Ref<Response> HandleRoute(Ref<Request> &request);
  Ref<Route> FindRoute(Ref<Request> &request);

  template <typename T>
  void Register(const std::string &endpoint, HttpMethod allowedMethod) {
    Register<T>(endpoint, static_cast<uint32_t>(allowedMethod));
  }

  template <typename T>
  void
  Register(const std::string &endpoint,
           uint32_t allowedMethods = static_cast<uint32_t>(HttpMethod::ALL)) {
    static_assert(std::is_base_of_v<Route, T>, "must be a Route");
    m_Tree.Add(endpoint,
               allowedMethods | HttpMethod::HEAD | HttpMethod::OPTIONS,
               [] { return std::make_shared<T>(); });
  }

  void Get(const std::string &path, const RouteFunction &);
  void Post(const std::string &path, const RouteFunction &);
  void Put(const std::string &path, const RouteFunction &);
  void Patch(const std::string &path, const RouteFunction &);
  void Delete(const std::string &path, const RouteFunction &);

private:
  RouteTree m_Tree{};
};
} // namespace VWeb