/*
File:   GfxUITabBar.cpp
Author: J. Ian Lindsay
Date:   2022.06.25

*/

#include "../GfxUI.h"


/*******************************************************************************
* GfxUITabBar
*******************************************************************************/
GfxUITabBar::GfxUITabBar(uint32_t x, uint32_t y, uint16_t w, uint16_t h, uint32_t color, uint32_t f) :
  GfxUIElement(x, y, w, h, f), _color(color) {}


int GfxUITabBar::_render(UIGfxWrapper* ui_gfx) {
  int8_t ret = 0;
  const uint32_t BTN_COUNT = (uint32_t) _children.size();
  for (uint btn_idx = 0; btn_idx < BTN_COUNT; btn_idx++) {
    GfxUIButton* btn_cur = (GfxUIButton*) _children.get(btn_idx);
    if (btn_cur->pressed()) {
      if (1 == _set_active_tab(btn_idx)) {
        ret = 1;
      }
    }
  }
  return ret;
}


bool GfxUITabBar::_notify(const GfxUIEvent GFX_EVNT, uint32_t x, uint32_t y) {
  bool ret = false;
  switch (GFX_EVNT) {
    default:
      return false;
  }
  if (ret) {
    _need_redraw(true);
  }
  return ret;
}


int8_t GfxUITabBar::addTab(const char* txt, bool selected) {
  int8_t ret = -1;
  const uint32_t flgs_inact = 0;
  const uint32_t flgs_act   = (GFXUI_BUTTON_FLAG_STATE | GFXUI_FLAG_INACTIVE);
  const uint32_t BTN_COUNT = (uint32_t) _children.size() + 1;  // Recalculate width.
  const uint32_t INTRNL_X = _internal_PosX();
  const uint32_t INTRNL_Y = _internal_PosY();
  const uint32_t INTRNL_H = _internal_Height();
  const uint32_t NEW_UNIT_W = (_internal_Width()/BTN_COUNT);

  GfxUIButton* n_btn = new GfxUITextButton(txt,
    INTRNL_X + (NEW_UNIT_W * (BTN_COUNT-1)), INTRNL_Y,
    NEW_UNIT_W, INTRNL_H,
    _color,
    ((GFXUI_FLAG_FREE_THIS_ELEMENT | GFXUI_FLAG_NEED_RERENDER) | (selected ? flgs_act : flgs_inact))
  );
  if (n_btn) {
    ret--;
    if (0 <= _add_child(n_btn)) {
      n_btn->setMargins(0, 2, 0, 0);
      uint32_t x_pix_accum = 0;
      for (uint btn_idx = 0; btn_idx < (BTN_COUNT-1); btn_idx++) {
        GfxUIElement* chld = _children.get(btn_idx);
        chld->reposition(INTRNL_X + x_pix_accum, INTRNL_Y);
        chld->resize(NEW_UNIT_W, INTRNL_H);
        x_pix_accum += NEW_UNIT_W;
      }
      _need_redraw(true);
      ret = 0;
    }
    else {
      delete n_btn;   // Oooops.
    }
  }
  return ret;
}


int8_t GfxUITabBar::_set_active_tab(uint8_t tab_idx) {
  int8_t ret = 0;
  if (_active_tab != tab_idx) {
    ret--;
    GfxUIButton* btn_n_act = (GfxUIButton*) _children.get(tab_idx);
    if (nullptr != btn_n_act) {
      const uint32_t BTN_COUNT = (uint32_t) _children.size();
      for (uint btn_idx = 0; btn_idx < BTN_COUNT; btn_idx++) {
        GfxUIButton* btn_p_act = (GfxUIButton*) _children.get(btn_idx);
        if (tab_idx == btn_idx) {
          btn_p_act->buttonState(true);
          btn_n_act->elementActive(false);   // Don't observe twice-selected tabs.
        }
        else {
          // Set all other tabs inactive, and sensitive.
          btn_p_act->buttonState(false);
          btn_p_act->elementActive(true);
        }
      }
      _active_tab = tab_idx;
      _need_redraw(true);
      ret = 1;
    }
  }
  return ret;
}