//======================================================================
// menu.ino
//======================================================================

#include "menu.h"

/*
   CW mode:
      WPM (although we can get this from Raduino)
        WPM: # (L/R, select/abort)
      FILT
        WIDE NORM NARR

   SSB mode:
      TX LVL
      COMP
      FILT
        WIDE NORM NARR

   Digi mode:
      TX LVL
*/

class MenuItem {
  public:
    MenuItem() {}
    virtual MenuItem* next() = 0;
    virtual MenuItem* prev() = 0;
    char text[MAX_TEXT_LEN + 1];
};

class TextMenu : public MenuItem {
  public:
    TextMenu(int num_entries, int entry_len): MenuItem(), _num_entries(num_entries), _entry_len(entry_len), _selected(0), _leftmost(0) {
      text[0] = '\0';
      _entries = new MenuItem*[_num_entries];
      _labels = new char*[_num_entries];
      for (int i = 0; i < _num_entries; i++) {
        _labels[i] = NULL;
      }
    }

    ~TextMenu() {
      for (int i = 0; i < _num_entries; i++) {
        if (_labels[i] != NULL) {
          delete _labels[i];
        }
      }
      delete _labels;
      delete _entries;
    }

    virtual MenuItem* next() {
      bool dirty = false;

      if (++_selected == _num_entries) {
        _selected = 0;
      }

      if (_selected < _leftmost) {
        _leftmost = _selected;
        dirty = true;
      } else {
        while ((_selected - _leftmost) * _entry_len >= MAX_TEXT_LEN) {
          _leftmost++;
          dirty = true;
        }
      }

      if (dirty) {
        for (int i = _leftmost; i < _num_entries; i++) {
          strncpy(&text[i - _leftmost], _labels[i], _entry_len);
        }
      }
      text[_selected - _leftmost] = MENU_SELECTED_CHAR;
      return this;
    }

    virtual MenuItem* prev() {
      bool dirty = false;

      if (_selected-- == 0) {
        _selected += _num_entries;
      }

      if (_selected < _leftmost) {
        _leftmost = _selected;
        dirty = true;
      } else {
        while ((_selected - _leftmost) * _entry_len >= MAX_TEXT_LEN) {
          _leftmost++;
          dirty = true;
        }
      }

      if (dirty) {
        updateText();
      } else {
        updateCursor();
      }
      return this;
    }

    void addEntry(int i, const char* label, MenuItem* entry) {
      if (i < _num_entries) {
        _labels[i] = new char[strlen(label) + 1]; // I need to learn to do strings the C++ way.
        strcpy(_labels[i], label);               // Ditto.
        _entries[i] = entry;
      }
    }

    void updateText() {
      for (int i = _leftmost; i < _num_entries; i++) {
        strncpy(&text[i - _leftmost], _labels[i], _entry_len);
      }
      text[_selected - _leftmost] = MENU_SELECTED_CHAR;
    }

    void updateCursor() {
      text[_selected - _leftmost] = MENU_SELECTED_CHAR;
    }
    
    /*MenuItem* operator[](int i) {
      return this->entries[i];
      }*/

  private:
    int _num_entries;
    int _entry_len;
    int _selected;
    int _leftmost;
    char** _labels;
    MenuItem** _entries;
};


//======================================================================
// EOF
//======================================================================