#include "menu_system.h"
#include "game.h"
#include "script_system.h"

void MenuSystem::tick(double dt) {
  pauseAnimation_.tick(dt);
  menuChangeAnimation_.tick(dt);

  if (openState_ == OpenState::Animating && pauseAnimation_.isComplete()) {
    if (pauseAnimation_.getProgress() == 0.0) {
      openState_ = OpenState::Closed;
      menus_.clear();

      game_.unpauseGameplay();
      game_.getMixer().unpauseSounds();
    } else if (pauseAnimation_.getProgress() == 1.0) {
      openState_ = OpenState::Open;
    }
  } else if (openState_ == OpenState::Open) {
    if (!isMenuChanging_) {
      cursorBobTimer_.accumulate(dt);
      while (cursorBobTimer_.step()) {
        if (cursorBobDown_) {
          cursorBob_++;

          if (cursorBob_ >= 4) {
            cursorBobDown_ = false;
          }
        } else {
          cursorBob_--;

          if (cursorBob_ <= 0) {
            cursorBobDown_ = true;
          }
        }
      }
    } else if (menuChangeAnimation_.isComplete()) {
      isMenuChanging_ = false;

      if (menuChangeAnimation_.getProgress() == 0.0) {
        menus_.pop_back();
      }
    }
  }
}

void MenuSystem::openPauseMenu() {
  pauseAnimation_.start(125, 1.0);
  openState_ = OpenState::Animating;

  game_.pauseGameplay();

  std::vector<MenuBuilder> builders = {
    MenuBuilder().Command("Settings")
                 .ActivationFunction([this] (Game&) {
                   openSubmenu(Menu({
                     MenuBuilder().Slider("Music Volume: ")
                                  .InitialValue(game_.getMixer().isMusicMuted() ? 0 : game_.getMixer().getMusicVolume())
                                  .MaxValue(10)
                                  .SelectionChangedFunction([this] (MenuItem& menuItem) {
                                    if (game_.getMixer().isMusicMuted()) {
                                      menuItem.value = game_.getMixer().getMusicVolume();
                                    }

                                    game_.getMixer().setMusicVolume(menuItem.value);
                                  }),
                     MenuBuilder().Slider("Sound Volume: ")
                                  .InitialValue(game_.getMixer().getSoundVolume())
                                  .MaxValue(10)
                                  .SelectionChangedFunction([this] (MenuItem& menuItem) {
                                    game_.getMixer().setSoundVolume(menuItem.value);
                                  }),
                     MenuBuilder().Command("Back")
                                  .ActivationFunction([this] (Game& game) {
                                    closePauseMenu();
                                  })
                                  .SkipSoundEffect()
                   }));
                 }),
    MenuBuilder().Command("Resume Game")
                 .ActivationFunction([] (Game& game) {
                   game.getSystem<MenuSystem>().closePauseMenu();
                 })
                 .SkipSoundEffect(),
    MenuBuilder().Command("Quit")
                 .ActivationFunction([] (Game& game) {
                   game.quit();
                 })
  };

  if (game_.getMap().hasExitArea()) {
    builders.push_back(MenuBuilder().Command("Exit Area")
                                    .ActivationFunction([] (Game& game) {
                                      game.getSystem<MenuSystem>().closePauseMenu(false);
                                      game.getSystem<ScriptSystem>().runScript(game.getMap().getName(), "exit_area");
                                    }));
  }

  menus_.emplace_back(builders);

  game_.getMixer().pauseSounds();
  game_.getMixer().playSound("../res/sfx/menu_open.wav");
}

void MenuSystem::closePauseMenu(bool playSfx) {
  if (menus_.size() > 1) {
    isMenuChanging_ = true;
    menuChangeAnimation_.start(250, 0.0);

    if (playSfx) {
      game_.getMixer().playSound("../res/sfx/menu_deselect.wav");
    }
  } else {
    pauseAnimation_.start(125, 0.0);
    openState_ = OpenState::Animating;

    if (playSfx) {
      game_.getMixer().playSound("../res/sfx/menu_close.wav");
    }
  }
}

void MenuSystem::pressedUp() {
  menus_.back().moveCursorUp();

  cursorBob_ = 0;
  cursorBobDown_ = true;

  game_.getMixer().playSound("../res/sfx/vertical_menu.wav");
}

void MenuSystem::pressedDown() {
  menus_.back().moveCursorDown();

  cursorBob_ = 0;
  cursorBobDown_ = true;

  game_.getMixer().playSound("../res/sfx/vertical_menu.wav");
}

void MenuSystem::pressedLeft() {
  Menu& curMenu = menus_.back();
  MenuItem& menuItem = curMenu.getItems()[curMenu.getCursorPosition()];

  if (menuItem.type == MenuType::Slider && menuItem.value > 0) {
    menuItem.value--;

    if (menuItem.selectionChanged) {
      menuItem.selectionChanged(menuItem);
    }

    game_.getMixer().playSound("../res/sfx/horizontal_menu.wav");
  }
}

void MenuSystem::pressedRight() {
  Menu& curMenu = menus_.back();
  MenuItem& menuItem = curMenu.getItems()[curMenu.getCursorPosition()];

  if (menuItem.type == MenuType::Slider && menuItem.value < menuItem.maxValue) {
    menuItem.value++;

    if (menuItem.selectionChanged) {
      menuItem.selectionChanged(menuItem);
    }

    game_.getMixer().playSound("../res/sfx/horizontal_menu.wav");
  }
}

void MenuSystem::activateOption() {
  Menu& curMenu = menus_.back();
  const MenuItem& menuItem = curMenu.getItems()[curMenu.getCursorPosition()];

  if (menuItem.type == MenuType::Command) {
    if (menuItem.playSfx) {
      game_.getMixer().playSound("../res/sfx/menu_activate.wav");
    }

    if (menuItem.activationFunction) {
      menuItem.activationFunction(game_);
    }
  }
}

void MenuSystem::openSubmenu(Menu submenu) {
  menus_.push_back(std::move(submenu));
  isMenuChanging_ = true;
  menuChangeAnimation_.start(250, 1.0);
}