/*
 * Copyright (C) 2017 Mentor Graphics Development (Deutschland) GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef TMCAGLWM_APP_HPP
#define TMCAGLWM_APP_HPP

#include <json-c/json.h>
#include <memory>
#include <unordered_map>
#include <unordered_set>

#include "afb_binding_api.hpp"
#include "config.hpp"
#include "controller_hooks.hpp"
#include "layers.hpp"
#include "layout.hpp"
#include "result.hpp"
#include "wayland.hpp"

namespace wl {
struct display;
}

namespace genivi {
struct controller;
}

namespace wm {

struct id_allocator {
   unsigned next = 0x0100'0000;

   // Surfaces that where requested but not yet created
   std::unordered_map<unsigned, std::string> surfaces;
   // std::unordered_set<unsigned> pending_surfaces;
   std::unordered_map<std::string, unsigned> names;

   id_allocator(id_allocator const &) = delete;
   id_allocator(id_allocator &&) = delete;
   id_allocator &operator=(id_allocator const &);
   id_allocator &operator=(id_allocator &&) = delete;

   // Allocate a new ID
   unsigned operator()(std::string const &name) {
      unsigned sid = this->next++;
      this->surfaces[sid] = name;
      // this->pending_surfaces.insert({sid});
      this->names[name] = sid;
      logdebug("allocated new id %u with name %s", sid, name.c_str());
      return sid;
   }

   // Lookup by ID or by name
   optional<unsigned> operator[](std::string const &name) {
      auto i = this->names.find(name);
      return i == this->names.end() ? nullopt : optional<unsigned>(i->second);
   }

   optional<std::string> operator[](unsigned id) {
      auto i = this->surfaces.find(id);
      return i == this->surfaces.end() ? nullopt
                                       : optional<std::string>(i->second);
   }
};

struct App {
   struct binding_api api;
   struct controller_hooks chooks;

   // This is the one thing, we do not own.
   struct wl::display *display;

   std::unique_ptr<struct genivi::controller> controller;
   std::vector<std::unique_ptr<struct wl::output>> outputs;

   struct config config;

   layouts_type layouts;
   layer_map layers;

   typedef std::pair<char const *, std::function<void()>> name_task_pair;
   std::vector<name_task_pair> pending;

   typedef std::map<std::string, int> drawing_name_map;
   drawing_name_map name_mapping;

   struct id_allocator id_alloc;

   explicit App(wl::display *d);
   ~App();

   App(App const &) = delete;
   App &operator=(App const &) = delete;
   App(App &&) = delete;
   App &operator=(App &&) = delete;

   int init();
   int init_layout();

   int dispatch_events();

   void surface_set_layout(uint32_t surface_id);
   char const *activate_surface(uint32_t surface_id);

   // Allocate a surface ID for this role
   result<int> request_surface(char const *drawing_name);

   // Activate (i.e. make visible, if allowed!) a surface
   char const *activate_surface(char const *drawng_name);

   // add tasks, executed after dispatch_events()
   void add_task(char const *name, std::function<void()> &&f);
   void execute_pending();

   // Events from the compositor we are interested in
   void surface_created(uint32_t surface_id);
   void surface_removed(uint32_t surface_id);
};

}  // namespace wm

#endif  // TMCAGLWM_APP_HPP