#include "renderer.h"
#include "simulation.h"
#include "consts.h"
#include "level.h"
#include "views.h"

Renderer::Renderer()
{
  win_ = window_ptr(
    SDL_CreateWindow(
      "dispatcher",
      100,
      100,
      WINDOW_SIZE.w(),
      WINDOW_SIZE.h(),
      SDL_WINDOW_SHOWN));

  if (!win_)
  {
    throw sdl_error();
  }

  ren_ = renderer_ptr(
    SDL_CreateRenderer(
      win_.get(),
      -1,
      SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC));

  if (!ren_)
  {
    throw sdl_error();
  }

  SDL_SetRenderDrawBlendMode(ren_.get(), SDL_BLENDMODE_MOD);
  SDL_SetRenderDrawColor(ren_.get(), 255, 150, 255, 255);
  SDL_RenderFillRect(ren_.get(), nullptr);
}

void Renderer::render(const Simulation& sim)
{
  texture_ptr canvas(
    SDL_CreateTexture(
      ren_.get(),
      SDL_PIXELFORMAT_RGBA8888,
      SDL_TEXTUREACCESS_TARGET,
      WINDOW_SIZE.w(),
      WINDOW_SIZE.h()));

  if (!canvas)
  {
    throw sdl_error();
  }

  SDL_SetRenderTarget(ren_.get(), nullptr);
  SDL_SetRenderDrawBlendMode(ren_.get(), SDL_BLENDMODE_NONE);
  SDL_SetRenderDrawColor(ren_.get(), 255, 150, rand() % 255, 255);
  SDL_RenderClear(ren_.get());

  const Level& level = sim.getLevel();

  for (size_t y = 0; y < level.getSize().h(); y++)
  {
    for (size_t x = 0; x < level.getSize().w(); x++)
    {
      int val = 255 - level.at(x, y) * 10;

      SDL_SetRenderDrawColor(ren_.get(), val, val, val, 255);

      SDL_Rect rect {
        static_cast<int>(x * TILE_SIZE.w()),
        static_cast<int>(y * TILE_SIZE.h()),
        TILE_SIZE.w(),
        TILE_SIZE.h()
      };

      SDL_RenderFillRect(ren_.get(), &rect);
    }
  }

  constexpr Layer renderOrder[] = { Layer::track, Layer::object };

  ranges::for_each(
    ranges::view::for_each(
      renderOrder,
      [&] (Layer layer) {
        return sim.entityRange() | views::isOnLayer(layer);
      }),
    [&] (const Entity& entity) {
      SDL_SetRenderDrawColor(ren_.get(), entity.colorVal, entity.colorVal, 65, 255);

      SDL_Rect rect {
        static_cast<int>(entity.pos.x()),
        static_cast<int>(entity.pos.y()),
        static_cast<int>(entity.size.w()),
        static_cast<int>(entity.size.h())
      };

      SDL_RenderFillRect(ren_.get(), &rect);
    });

  //SDL_RenderCopy(ren_.get(), canvas.get(), nullptr, nullptr);
  SDL_RenderPresent(ren_.get());
}