#include <SDL2/SDL_ttf.h>

#include "font.hh"
#include "TextWidget.hh"

TextWidget::TextWidget(Font& font, std::string text, int width, int height)
  : Widget(width, height), text_(std::move(text)), font_(font),
    textSurf_(nullptr)
{
  layout();
}

TextWidget::~TextWidget()
{
}

void TextWidget::setText(std::string text)
{
  if (text != text_) {
    text_ = std::move(text);
    invalidateGL();
    layout();
  }
}

void TextWidget::setForegroundColor(SDL_Color fg)
{
  Widget::setForegroundColor(fg);

  // Trigger text rerender
  layout();
}

void TextWidget::layout()
{
  // Determine text size
  int width, height;
  if(TTF_SizeUTF8(font_.getFont(), text_.c_str(), &width, &height) != 0)
    throw TTFException{};

  if ((width > (width_ - padLeft_ - padRight_)) && (width_ != WRAP_CONTENT)) {
    textSurf_.reset(TTF_RenderUTF8_Blended_Wrapped(font_.getFont(),
						   text_.c_str(),
						   fg_, width_- padLeft_ - padRight_));
    if (!textSurf_)
      throw TTFException{};

    if (height_ == WRAP_CONTENT)
      // TODO: Get proper tight bounding box for multiline text
      if (realHeight_ != (textSurf_->h - // TTF_FontLineSkip(font_.getFont())
			  + padTop_ + padBottom_)) {
	realHeight_ = textSurf_->h - // TTF_FontLineSkip(font_.getFont())
	  + padTop_ + padBottom_;
	invalidateGL();
      }
  } else {
    textSurf_.reset(TTF_RenderUTF8_Blended(font_.getFont(), text_.c_str(), fg_));

    if (!textSurf_)
      throw TTFException{};
    
    if (width_ == WRAP_CONTENT)
      if (realWidth_ != (textSurf_->w + padLeft_ + padRight_)) {
	realWidth_ = textSurf_->w + padLeft_ + padRight_;
	invalidateGL();
      }
    if (height_ == WRAP_CONTENT)
      if (realHeight_ != (textSurf_->h + padTop_ + padBottom_)) {
	realHeight_ = textSurf_->h + padTop_ + padBottom_;
	invalidateGL();
      }
  }
  
}

void TextWidget::render(SDL_Surface *dst, SDL_Rect *dstRect) const
{
  Widget::render(dst, dstRect);

  SDL_Rect rect = calcContentRect(dst, dstRect, textSurf_->clip_rect);
  
  if (SDL_BlitSurface(textSurf_.get(), nullptr, dst, &rect) != 0)
    throw SDLException{};
}