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//
// Created by mfritzsc on 7/11/17.
//

#include "app.hpp"
#include "json_helper.hpp"
#include "util.hpp"
#include "wayland.hpp"

#include <cassert>

#include <json-c/json.h>

namespace wm {

namespace {
App *g_app;
}  // namespace

App::App(wl::display *d) : api{this}, display{d}, controller{}, outputs() {
   assert(g_app == nullptr);
   g_app = this;
}

App::~App() {
   g_app = nullptr;
}

int App::init() {
   if (!this->display->ok()) {
      return -1;
   }

   this->display->r.add_global_handler(
      "wl_output", [](wl_registry *r, uint32_t name, uint32_t v) {
         g_app->outputs.emplace_back(std::make_unique<wl::output>(r, name, v));
      });

   this->display->r.add_global_handler(
      "ivi_controller", [](wl_registry *r, uint32_t name, uint32_t v) {
         g_app->controller = std::make_unique<genivi::controller>(r, name, v);

         // XXX: This protocol needs the output, so lets just add our mapping
         // here...
         g_app->controller->add_proxy_to_id_mapping(
            g_app->outputs.back()->proxy.get(),
            wl_proxy_get_id(reinterpret_cast<struct wl_proxy *>(
               g_app->outputs.back()->proxy.get())));
      });

   // First level objects
   this->display->roundtrip();
   // Second level objects
   this->display->roundtrip();
   // Third level objects
   this->display->roundtrip();

   return init_layout();
}

int App::dispatch_events() {
   int ret = this->display->dispatch();
   if (ret == -1) {
      logerror("wl_display_dipatch() returned error %d",
               this->display->get_error());
      return -1;
   }
   this->display->flush();

   // execute pending tasks, that is layout changes etc.
   this->controller->execute_pending();
   this->display->roundtrip();

   return 0;
}

//  _       _ _       _                         _    ____
// (_)_ __ (_) |_    | | __ _ _   _  ___  _   _| |_ / /\ \
// | | '_ \| | __|   | |/ _` | | | |/ _ \| | | | __| |  | |
// | | | | | | |_    | | (_| | |_| | (_) | |_| | |_| |  | |
// |_|_| |_|_|\__|___|_|\__,_|\__, |\___/ \__,_|\__| |  | |
//              |_____|       |___/                 \_\/_/
int App::init_layout() {
   if (!this->controller) {
      logerror("ivi_controller global not available");
      return -1;
   }

   if (this->outputs.empty()) {
      logerror("no output was set up!");
      return -1;
   }

   auto &c = this->controller;

   auto &o = this->outputs.front();
   auto &s = c->screens.begin()->second;
   auto &layers = c->layers;

   // XXX: Write output dimensions to ivi controller...
   c->output_size = genivi::size{uint32_t(o->width), uint32_t(o->height)};

   // Clear scene
   layers.clear();

   // Clear screen
   s->clear();

   // Setup our dummy scene...
   c->layer_create(100, 0, 0);   // bottom layer, anything else
   c->layer_create(1000, 0, 0);  // top layer, mandelbrot

   auto &l100 = c->layers[100];
   auto &l1k = c->layers[1000];

   // Set layers fullscreen
   l100->set_destination_rectangle(0, 0, o->width, o->height);
   l1k->set_destination_rectangle(0, 0, o->width, o->height);
   l100->set_visibility(1);
   l1k->set_visibility(1);

   // Add layers to screen
   s->set_render_order({100, 1000});

   c->commit_changes();

   this->display->flush();

   return 0;
}

binding_api::result_type binding_api::register_surface(uint32_t appid,
                                                       uint32_t surfid) {
   logdebug("%s appid %u surfid %u", __func__, appid, surfid);
   if (appid > 0xff) {
      return Err<json_object *>("invalid appid");
   }

   if (surfid > 0xffff) {
      return Err<json_object *>("invalid surfaceid");
   }

   return Ok(json_object_new_int((appid << 16) + surfid));
}

binding_api::result_type binding_api::debug_layers() {
   logdebug("%s", __func__);
   return Ok(to_json(this->app->controller->lprops));
}

binding_api::result_type binding_api::debug_surfaces() {
   logdebug("%s", __func__);
   return Ok(to_json(this->app->controller->sprops));
}

binding_api::result_type binding_api::debug_status() {
   logdebug("%s", __func__);
   json_object *jr = json_object_new_object();
   json_object_object_add(jr, "surfaces",
                          to_json(this->app->controller->sprops));
   json_object_object_add(jr, "layers", to_json(this->app->controller->lprops));
   return Ok(jr);
}

}  // namespace wm