/*************************************************************************/
/*  bitmap_font_fb.h                                                     */
/*************************************************************************/
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#ifndef BITMAP_FONT_FALLBACK_H
#define BITMAP_FONT_FALLBACK_H

#include "font_fb.h"

struct BitmapFontDataFallback : public FontDataFallback {
	_THREAD_SAFE_CLASS_

private:
	Vector<Ref<Texture2D>> textures;

	struct Character {
		int texture_idx = 0;
		Rect2 rect;
		Vector2 align;
		Vector2 advance = Vector2(-1, -1);
	};

	struct KerningPairKey {
		union {
			struct {
				uint32_t A, B;
			};

			uint64_t pair = 0;
		};

		_FORCE_INLINE_ bool operator<(const KerningPairKey &p_r) const { return pair < p_r.pair; }
	};

	HashMap<char32_t, Character> char_map;
	Map<KerningPairKey, int> kerning_map;

	float height = 0.f;
	float ascent = 0.f;
	int base_size = 0;
	bool distance_field_hint = false;

public:
	virtual void clear_cache() override{};

	virtual Error load_from_file(const String &p_filename, int p_base_size) override;
	virtual Error bitmap_new(float p_height, float p_ascent, int p_base_size) override;

	virtual void bitmap_add_texture(const Ref<Texture> &p_texture) override;
	virtual void bitmap_add_char(char32_t p_char, int p_texture_idx, const Rect2 &p_rect, const Size2 &p_align, float p_advance) override;
	virtual void bitmap_add_kerning_pair(char32_t p_A, char32_t p_B, int p_kerning) override;

	virtual float get_height(int p_size) const override;
	virtual float get_ascent(int p_size) const override;
	virtual float get_descent(int p_size) const override;

	virtual float get_underline_position(int p_size) const override;
	virtual float get_underline_thickness(int p_size) const override;

	virtual void set_antialiased(bool p_antialiased) override{};
	virtual bool get_antialiased() const override { return false; };

	virtual void set_hinting(TextServer::Hinting p_hinting) override{};
	virtual TextServer::Hinting get_hinting() const override { return TextServer::HINTING_NONE; };

	virtual void set_distance_field_hint(bool p_distance_field) override;
	virtual bool get_distance_field_hint() const override;

	virtual void set_force_autohinter(bool p_enabeld) override{};
	virtual bool get_force_autohinter() const override { return false; };

	virtual bool has_outline() const override { return false; };
	virtual float get_base_size() const override;

	virtual bool has_char(char32_t p_char) const override;
	virtual String get_supported_chars() const override;

	virtual Vector2 get_advance(char32_t p_char, int p_size) const override;
	virtual Vector2 get_kerning(char32_t p_char, char32_t p_next, int p_size) const override;

	virtual Vector2 draw_glyph(RID p_canvas, int p_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color) const override;
	virtual Vector2 draw_glyph_outline(RID p_canvas, int p_size, int p_outline_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color) const override;
};

#endif // BITMAP_FONT_FALLBACK_H