#include "StackPanel.hpp"
#include <functional>
#include <GUI_Paint.h>

//using namespace myink::ui;

void draw_background(const PositionalProperties & positionals, const Color & background_color);
void draw_border(const PositionalProperties positionals, const Color & color, const LineWidth & border_line_width);

StackPanel::StackPanel(const StackPanelStyleProperties & s, const DrawItemCallBackList & i, const MoveToNextItem & m): style(s), itmes(i), move(m)
{
}

StackPanel::~StackPanel()
{
}

PositionalProperties StackPanel::draw(const PositionalProperties & positionals) const
{
  auto border_line_width = style.border_line_width;
  auto margin = style.margin;
  auto padding = style.padding;
  auto inner_gap = border_line_width + padding;
  auto gap  = inner_gap + margin;
  if (itmes.size == 0) {
    PositionalProperties outer = { 
      positionals.left, 
      positionals.top,
      positionals.width + 2 * (gap),
      positionals.height + 2 * (gap)
    };
    draw_background(outer, style.background_color);
    return outer;
  }    

  PositionalProperties inner = { 
      positionals.left + gap, 
      positionals.top + gap,
      0,
      0
  };

  for(auto i = 0; i < itmes.size; i++) {    
    auto & callback = itmes.callbacks[i];
    auto last = callback(inner);
    inner = move(inner, last);
  }
  
  auto out_distance = 2 * (gap + padding);
  PositionalProperties outer = { 
      positionals.left, 
      positionals.top,
      inner.width + out_distance,
      inner.height + out_distance
  };

  if (border_line_width < 1)
  {
    return outer;
  }
  
  PositionalProperties border_positionals = {
    positionals.left + padding, 
    positionals.top + padding, 
    inner.width + (2 *  margin) + border_line_width, 
    inner.height + (2 * margin) + border_line_width
  };

  draw_border(border_positionals, style.border_line_color, border_line_width);
  return outer;
}

PositionalProperties StackPanel::move_down(const PositionalProperties & i, const PositionalProperties & p)
{
  return {
    i.left,
    i.top + p.height,
    p.width > i.width  ? p.width : i.width,
    i.height + p.height
  };
}

PositionalProperties StackPanel::move_right(const PositionalProperties & i, const PositionalProperties & p)
{
  return {
    i.left + p.width,
    i.top,
    i.width + p.width,
    p.height > i.height  ? p.height : i.height
  };
}

void draw_background(const PositionalProperties & positionals, const  Color & background_color)
{
  Paint_ClearWindows(positionals.left, positionals.top, positionals.left + positionals.width, positionals.top + positionals.height, background_color);
}

void draw_border(const PositionalProperties p, const Color & color, const LineWidth & border_line_width)
{
  auto border_line_width_pixel = border_line_width > 8 ? DOT_PIXEL::DOT_PIXEL_8X8 : DOT_PIXEL(border_line_width);
  Paint_DrawRectangle(p.left, p.top, p.left + p.width, p.top + p.height, color, border_line_width_pixel, DRAW_FILL_EMPTY);
}