#include <chrono>                   // for operator""s, chrono_literals
#include <iostream>                 // for cout, ostream
#include <fstream>
#include <memory>                   // for allocator, shared_ptr
#include <string>                   // for string, operator<<
#include <thread>                   // for sleep_for
#include <array>
#include <algorithm>

#include <ftxui/dom/elements.hpp>  // for hflow, paragraph, separator, hbox, vbox, filler, operator|, border, Element
#include <ftxui/dom/node.hpp>      // for Render
#include <ftxui/screen/box.hpp>    // for ftxui
#include <ftxui/component/loop.hpp>
#include <ftxui/screen/color.hpp>

#include <fmt/core.h>
#include "dbc.hpp"
#include "gui.hpp"
#include "rand.hpp"
#include "systems.hpp"
#include "events.hpp"
#include "render.hpp"
#include "save.hpp"

using std::string;
using namespace fmt;
using namespace std::chrono_literals;
using namespace ftxui;
using namespace components;


GUI::GUI(DinkyECS::World &world, Map& game_map) :
  $game_map(game_map),
  $log({{"Welcome to the game!"}}),
  $view_port{0,0},
  $status_screen(SCREEN_X, SCREEN_Y),
  $map_screen(0,0),
  $world(world),
  $sounds("./assets"),
  $renderer()
{
  // this needs a config file soon
  // $sounds.load("ambient", "ambient_sound.mp3");
  $sounds.load("loot_gold", "loot_gold.mp3");
  $sounds.load("combat_player_hit", "combat_player_hit.mp3");
  $sounds.load("combat_enemy_hit", "combat_enemy_hit.mp3");
  $sounds.load("combat_miss", "combat_miss.mp3");
  resize_map(MAX_FONT_SIZE);
}

void GUI::resize_map(int new_size) {
  if($renderer.resize_map(new_size, $view_port)) {
    // set canvas to best size
    $canvas = Canvas($view_port.x * 2, $view_port.y * 4);
    $map_screen = Screen($view_port.x, $view_port.y);
  }
}

void GUI::save_world() {
  $log.log("Game saved!");
  save::to_file("./savefile.world", $world, $game_map);
}

void GUI::create_renderer() {
  Terminal::SetColorSupport(Terminal::Color::TrueColor);
  auto player = $world.get_the<Player>();

  $map_view = Renderer([&] {
    System::draw_map($world, $game_map, $canvas, $view_port.x, $view_port.y);
    return canvas($canvas);
  });

  $prompt = Renderer([&] {
    return hbox({hflow(vbox(text("HELLO!")))}) | border;
  });


  $status_ui = Renderer([&, player]{
    const auto& player_combat = $world.get<Combat>(player.entity);
    const auto& inventory = $world.get<Inventory>(player.entity);
    $status_text = player_combat.hp > 0 ? "NOT DEAD" : "DEAD!!!!!!";

    std::vector<Element> log_list;
    for(auto msg : $log.messages) {
      log_list.push_back(text(msg));
    }

    auto log_box = vbox(log_list) | yflex_grow | border;

    return hbox({
        hflow(
          vbox(
              text(format("HP: {: >3} GOLD: {: >3}",
                  player_combat.hp, inventory.gold)) | border,
              text($status_text) | border,
              separator(),
              log_box
              )  | flex_grow
        ),
        separator(),
        hbox(),
    });
  });
}

void GUI::handle_world_events() {
  using eGUI = Events::GUI;
  auto player = $world.get_the<Player>();

  while($world.has_event<eGUI>()) {
    auto [evt, entity, data] = $world.recv<eGUI>();

    switch(evt) {
      case eGUI::COMBAT: {
          auto &damage = std::any_cast<Events::Combat&>(data);
          auto enemy_combat = $world.get<Combat>(entity);

          if(damage.enemy_did > 0) {
            $log.log(format("Enemy HIT YOU for {} damage!", damage.enemy_did));
            $log.log(format("-- Enemy has {} HP left.", enemy_combat.hp));
            $sounds.play("combat_enemy_hit");
            shake();
          } else {
            $log.log("Enemy MISSED YOU.");
          }

          if(damage.player_did > 0) {
            $log.log(format("You HIT enemy for {} damage!", damage.player_did));
            $sounds.play("combat_player_hit");
          } else {
            $sounds.play("combat_miss");
            $log.log("You MISSED the enemy.");
          }
        } break;
      case eGUI::LOOT: {
          auto &loot = std::any_cast<Loot&>(data);
          auto inventory = $world.get<Inventory>(player.entity);
          $sounds.play("loot_gold");
          $log.log(format("You found {} gold. You have {} now.",
                loot.amount, inventory.gold));
        }
        break;
      default:
        $log.log(format("INVALID EVENT! {},{}", evt, entity));
    }
  }
}

bool GUI::handle_ui_events() {
  bool event_happened = false;
  sf::Event event;
  auto player = $world.get_the<Player>();
  int map_font_size = $renderer.font_size();

  while($renderer.poll_event(event)) {
    if(event.type == sf::Event::Closed) {
      $renderer.close();
    } else if(event.type ==  sf::Event::KeyPressed) {
      auto& player_motion = $world.get<Motion>(player.entity);

      if(sf::Keyboard::isKeyPressed(sf::Keyboard::Left)) {
        player_motion.dx = -1;
        event_happened = true;
      } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Right)) {
        player_motion.dx = 1;
        event_happened = true;
      } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Up)) {
        player_motion.dy = -1;
        event_happened = true;
      } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Down)) {
        player_motion.dy = 1;
        event_happened = true;
      } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Equal)) {
        resize_map(map_font_size + 10);
      } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Hyphen)) {
        resize_map(map_font_size - 10);
      } else if(sf::Keyboard::isKeyPressed(sf::Keyboard::S)) {
        save_world();
      }
    }
  }

  return event_happened;
}


void GUI::run_systems() {
  auto player = $world.get_the<Player>();
  System::enemy_pathing($world, $game_map, player);
  System::motion($world, $game_map);
  System::collision($world, player);
  System::death($world);
}

void GUI::shake() {
  for(int i = 0; i < 10; ++i) {
    int x = Random::uniform<int>(-10,10);
    int y = Random::uniform<int>(-10,10);
    // add x/y back to draw screen
    $renderer.draw_screen($map_screen, x, y);
    std::this_thread::sleep_for(1ms);
  }
}

void GUI::render_scene() {
  $renderer.clear();

  $status_screen.Clear();
  Render($status_screen, $status_ui->Render());
  $renderer.draw_text_ui($status_screen, 0, 0);

  $map_screen.Clear();
  Render($map_screen, $map_view->Render());
  $renderer.draw_screen($map_screen);

  /*
  Screen prompt_screen(30,10);
  Render(prompt_screen, $prompt->Render());
  $renderer.draw_text_ui(prompt_screen, 700, 300);
  */

  $renderer.display();
}

int GUI::main() {
  // $sounds.play("ambient");
  create_renderer();
  run_systems();

  while($renderer.is_open()) {
    render_scene();

    if(handle_ui_events()) {
      run_systems();
    }

    handle_world_events();
    std::this_thread::sleep_for(10ms);
  }

  return 0;
}