#pragma once

#include "drawtypes/label.hpp"
#include "modules/meta.hpp"

LEMONBUDDY_NS

namespace modules {
  struct menu_tree_item {
    string exec;
    label_t label;
  };

  struct menu_tree {
    vector<unique_ptr<menu_tree_item>> items;
  };

  class menu_module : public static_module<menu_module> {
   public:
    using static_module::static_module;

    void setup() {
      string default_format{TAG_LABEL_TOGGLE + string{" "} + TAG_MENU};

      m_formatter->add(DEFAULT_FORMAT, default_format, {TAG_LABEL_TOGGLE, TAG_MENU});

      if (m_formatter->has(TAG_LABEL_TOGGLE)) {
        m_labelopen = get_config_label(m_conf, name(), "label-open");
        m_labelclose = get_optional_config_label(m_conf, name(), "label-close", "x");
      }

      m_labelseparator = get_optional_config_label(m_conf, name(), "label-separator", "");

      if (!m_formatter->has(TAG_MENU))
        return;

      while (true) {
        string level_param{"menu-" + to_string(m_levels.size())};

        if (m_conf.get<string>(name(), level_param + "-0", "").empty())
          break;

        m_log.trace("%s: Creating menu level %i", name(), m_levels.size());
        m_levels.emplace_back(make_unique<menu_tree>());

        while (true) {
          string item_param{level_param + "-" + to_string(m_levels.back()->items.size())};

          if (m_conf.get<string>(name(), item_param, "").empty())
            break;

          m_log.trace("%s: Creating menu level item %i", name(), m_levels.back()->items.size());
          auto item = make_unique<menu_tree_item>();
          item->label = get_config_label(m_conf, name(), item_param);
          item->exec = m_conf.get<string>(name(), item_param + "-exec", EVENT_MENU_CLOSE);
          m_levels.back()->items.emplace_back(std::move(item));
        }
      }
    }

    bool build(builder* builder, string tag) const {
      if (tag == TAG_LABEL_TOGGLE && m_level == -1) {
        builder->cmd(mousebtn::LEFT, string(EVENT_MENU_OPEN) + "0");
        builder->node(m_labelopen);
        builder->cmd_close(true);
      } else if (tag == TAG_LABEL_TOGGLE && m_level > -1) {
        builder->cmd(mousebtn::LEFT, EVENT_MENU_CLOSE);
        builder->node(m_labelclose);
        builder->cmd_close(true);
      } else if (tag == TAG_MENU && m_level > -1) {
        for (auto&& item : m_levels[m_level]->items) {
          if (item != m_levels[m_level]->items.front())
            builder->space();
          if (*m_labelseparator)
            builder->node(m_labelseparator, true);
          builder->cmd(mousebtn::LEFT, item->exec);
          builder->node(item->label);
          builder->cmd_close(true);
        }
      } else {
        return false;
      }
      return true;
    }

    bool handle_event(string cmd) {
      if (cmd.compare(0, 4, "menu") != 0)
        return false;

      // broadcast update when leaving leaving the function
      auto exit_handler = scope_util::make_exit_handler<>([this]() {
        if (!m_threads.empty()) {
          m_log.trace("%s: Cleaning up previous broadcast threads", name());
          for (auto&& thread : m_threads)
            if (thread.joinable())
              thread.join();
          m_threads.clear();
        }

        m_log.trace("%s: Dispatching broadcast thread", name());
        m_threads.emplace_back(thread(&menu_module::broadcast, this));
      });

      if (cmd.compare(0, strlen(EVENT_MENU_OPEN), EVENT_MENU_OPEN) == 0) {
        auto level = cmd.substr(strlen(EVENT_MENU_OPEN));

        if (level.empty())
          level = "0";

        m_level = std::atoi(level.c_str());
        m_log.info("%s: Opening menu level '%i'", name(), static_cast<int>(m_level));

        if (static_cast<size_t>(m_level) >= m_levels.size()) {
          m_log.warn("%s: Cannot open unexisting menu level '%i'", name(), level);
          m_level = -1;
        }
      } else if (cmd == EVENT_MENU_CLOSE) {
        m_log.info("%s: Closing menu tree", name());
        m_level = -1;
      }

      return true;
    }

    bool receive_events() const {
      return true;
    }

   private:
    static constexpr auto TAG_LABEL_TOGGLE = "<label-toggle>";
    static constexpr auto TAG_MENU = "<menu>";

    static constexpr auto EVENT_MENU_OPEN = "menu-open-";
    static constexpr auto EVENT_MENU_CLOSE = "menu-close";

    label_t m_labelopen;
    label_t m_labelclose;
    label_t m_labelseparator;

    vector<unique_ptr<menu_tree>> m_levels;

    std::atomic<int> m_level{-1};
  };
}

LEMONBUDDY_NS_END