#include <psemek/ui/label.hpp>

namespace psemek::ui
{

	void label::set_text(std::string text)
	{
		text_ = std::move(text);
		on_state_changed();
	}

	void label::set_halign(halignment value)
	{
		halign_ = value;
		on_state_changed();
	}

	void label::set_valign(valignment value)
	{
		valign_ = value;
		on_state_changed();
	}

	void label::set_multiline(multiline_mode value)
	{
		multiline_ = value;
		on_state_changed();
	}

	void label::set_overflow(overflow_mode value)
	{
		overflow_ = value;
		on_state_changed();
	}

	void label::reshape(geom::box<float, 2> const & bbox)
	{
		shape_.box = bbox;
		cached_state_.reset();
	}

	void label::draw(painter & p) const
	{
		if (text_.empty()) return;

		auto st = style();
		if (!st) return;
		if (!st->font) return;

		if (!cached_state_ || cached_state_->font != st->font.get())
		{
			cached_state_ = cached_state{};
			cached_state_->font = st->font.get();

			shape_options opts;
			opts.scale = st->text_scale;
			cached_state_->glyphs = st->font->shape(text_, opts);

			geom::box<float, 2> bbox;
			for (auto const & g : cached_state_->glyphs)
				bbox |= g.position;

			geom::vector<float, 2> offset;
			offset[0] = shape_.box[0].center() - bbox[0].length() / 2.f;
			offset[1] = shape_.box[1].center() - st->text_scale * st->font->size()[1] / 2.f;

			for (auto & g : cached_state_->glyphs)
				g.position += offset;
		}

		for (auto & g : cached_state_->glyphs)
			p.draw_glyph(*st->font, g.character, g.position, st->text_color);
	}

	void label::on_state_changed()
	{
		// TODO: changes should notify parent about content change
		element::reshape();
	}

}