#include "imgui.h"
#include "imgui-SFML.h"
#define _USE_MATH_DEFINES
#include <math.h>
#include <fmt/core.h>
#include <SFML/Graphics/Texture.hpp>
#include <SFML/Graphics/RectangleShape.hpp>
#include <SFML/Graphics/CircleShape.hpp>
#include <SFML/Graphics/Text.hpp>
#include <SFML/Audio.hpp>
#include <SFML/Window/Event.hpp>
#include "sfmlbackend.hpp"

using namespace ImGui;
using std::string;

void SFMLBackend::ImGui_setup() {
  bool res = SFML::Init(window);
  fmt::println("IMGUI returned {}", res);
}

void SFMLBackend::ImGui_update() {
  sf::Vector2u size = window.getSize();

  SFML::Update(window, deltaClock.restart());

  SetNextWindowPos(ImVec2(0, 0));
  SetNextWindowSize(ImVec2(size.x, size.y));

  Begin("Build Status", &window_active_out);

  TextColored(ImVec4(1,1,0,1), "Build Log");
  BeginChild("Scrolling");
  for(string &line : log) {
    TextWrapped(line.c_str());
  }
  EndChild();
  End();
}

void SFMLBackend::Window_update() {
    if(show_build_log) {
      SFML::Render(window);
    }
    window.display();
}

void SFMLBackend::handle_events() {
  sf::Event event;

  // is this a main event loop
  while (window.pollEvent(event)) {
    if(show_build_log) {
      SFML::ProcessEvent(window, event);
    }

    switch(event.type) {
      case sf::Event::Closed:
        fmt::print("Exiting...\n");
        window.close();
        break;
      case sf::Event::KeyPressed:
        if(sf::Keyboard::isKeyPressed(sf::Keyboard::Escape)) {
          if(show_build_log) {
            window_active_out = false;
          } else {
            window.close();
          }
        } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Space)) {
          window_active_out = !window_active_out;
        }
        break;
      default:
        // do nothing
        break;
    }
  }
}

sf::Vector2f translate(int x, int y) {
  float step_x = X_DIM / TEXT_SIZE;
  float step_y = (Y_DIM - 12) / TEXT_SIZE;

  sf::Vector2f position{step_x * x, step_y * y * 2};

  return position;
}


void SFMLBackend::write_text(int x, int y, string content) {
  sf::Vector2f position = translate(x,y);
  sf::Text text;
  text.setFont(font);
  text.setString(content);
  text.setCharacterSize(TEXT_SIZE);
  text.setFillColor(sf::Color(100, 250, 50));
  text.setPosition(position);
  window.draw(text);
}

void SFMLBackend::update_entities() {
  window.clear();

  sf::RectangleShape face_box(translate(X_ROWS/4, Y_LINES/2));
  face_box.setPosition(translate(X_ROWS/3+2,2));
  face_box.setOutlineColor(sf::Color(50, 200, 25));
  face_box.setOutlineThickness(10);
  face_box.setFillColor(sf::Color(200, 250, 200));
  window.draw(face_box);

  constexpr int hp_box_len = 44;

  int current_hp = (float(game.hit_points) / float(game.starting_hp)) * float(hp_box_len);

  sf::RectangleShape hp_bar(translate(current_hp,2));
  hp_bar.setPosition(translate(2,21));
  hp_bar.setFillColor(sf::Color(100, 250, 50));
  window.draw(hp_bar);

  sf::RectangleShape hp_box(translate(hp_box_len,2));
  hp_box.setPosition(translate(2,21));
  hp_box.setOutlineColor(sf::Color(100, 200, 50));
  hp_box.setOutlineThickness(10);
  hp_box.setFillColor(sf::Color::Transparent);
  window.draw(hp_box);

  string status = fmt::format("HP {} Rounds {}  Streaks {}  Deaths XXX", game.hit_points, game.rounds, game.streak);
  write_text(2, 18, status);

  if(show_build_log) {
    ImGui_update();
  }
  Window_update();

  show_build_log = window_active_out;
}

SFMLBackend::SFMLBackend(GameEngine &g) : window(sf::VideoMode(X_DIM, Y_DIM), "Turing's Tarpit", sf::Style::None, settings), game(g)
{

}

void SFMLBackend::update_log(std::vector<string> &lines) {
  log.clear();
  for(string &line : lines) {
    log.push_back(line);
  }
}

void SFMLBackend::startup() {
  fmt::print("Setting up a window for you...\n");
  settings.antialiasingLevel = 8;

  if(!font.loadFromFile("./assets/text.ttf")) {
    fmt::println("Cannot load font.");
  }

  window.setPosition({.x=0,.y=0});

  window.setFramerateLimit(FPS);
  window.setVerticalSyncEnabled(true);
  ImGui_setup();
}

bool SFMLBackend::is_open() {
  return window.isOpen();
}

void SFMLBackend::shutdown() {
  SFML::Shutdown();
}