#ifndef FONT_HPP
#define FONT_HPP

#include "sprite.hpp"

#include <nds/ndstypes.h>
#include <string>
#include <string_view>
#include <vector>

#include "UNIVCORE_CONFIG.h"

enum class Alignment {
	left,
	center,
	right,
};

class Font {
private:
#ifdef TEXT_BUFFERED
	static u8 textBuf[2][256 * 192];
#endif

	u8 tileWidth, tileHeight;
	u16 tileSize;
	u16 questionMark = 0;
	std::vector<u8> fontTiles;
	std::vector<u8> fontWidths;
	std::vector<u16> fontMap;

	u16 charIndex(char16_t c);

	void print(std::u16string_view text, int x, int y, bool top, int layer, Alignment align, int maxWidth, int color, float scaleX, float scaleY, Sprite *sprite);

public:
	/**
	 * @brief Converts a UTF-8 string to UCS-2
	 * @param text The string to convert
	 * @return The converted string
	 */
	static std::u16string utf8to16(std::string_view text);

	/**
	 * @brief Text printing class
	 * @param paths The path to load the font from
	 */
	Font(const std::string &path) : Font(std::vector<std::string>({path})) {}
	/**
	 * @brief Text printing class
	 * @param paths The paths to try load the font from, from highest to lowest priority
	 */
	Font(const std::vector<std::string> &paths);

	Font() {}
	~Font() {}

	/**
	 * @brief The height of the font
	 * @return The font height
	 */
	u8 height(void) { return tileHeight; }

	/**
	 * @brief Calculates the width of a given string of text
	 * @param text The text to calculate the width of
	 * @return The width of the given string
	 */
	int calcWidth(std::string_view text) { return calcWidth(utf8to16(text)); }
	int calcWidth(std::u16string_view text);

	/**
	 * @brief Prints an integer value to a background layer
	 * @param value The value to print
	 * @param x The X position to print at
	 * @param y The Y position to print at
	 * @param top Whether to print on the top or bottom screen
	 * @param layer (Optional) The layer to print on
	 * @param align (Optional) The alignment to use
	 * @param maxWidth (Optional) The maximum width of the string, set to 0 for no max width
	 * @param color (Optional) The color to print in
	 * @param scaleX (Optional) The scale on the X axis
	 * @param scaleY (Optional) The scale on the Y axis
	 */
	void print(int value, int x, int y, bool top, int layer = 2, Alignment align = Alignment::left, int maxWidth = 0, int color = 0, float scaleX = 1.0f, float scaleY = 1.0f) { print(utf8to16(std::to_string(value)), x, y, top, layer, align, maxWidth, scaleX, scaleY, color, nullptr); }

	/**
	 * @brief Prints a string to a background layer
	 * @param text The string to print
	 * @param x The X position to print at
	 * @param y The Y position to print at
	 * @param top Whether to print on the top or bottom screen
	 * @param layer (Optional) The layer to print on
	 * @param align (Optional) The alignment to use
	 * @param maxWidth (Optional) The maximum width of the string, set to 0 for no max width
	 * @param scaleX (Optional) The scale on the X axis
	 * @param scaleY (Optional) The scale on the Y axis
	 * @param color (Optional) The color to print in
	 */
	void print(std::string_view text, int x, int y, bool top, int layer = 2, Alignment align = Alignment::left, int maxWidth = 0, int color = 0, float scaleX = 1.0f, float scaleY = 1.0f) { print(utf8to16(text), x, y, top, layer, align, maxWidth, color, scaleX, scaleY, nullptr); }
	void print(std::u16string_view text, int x, int y, bool top, int layer = 2, Alignment align = Alignment::left, int maxWidth = 0, int color = 0, float scaleX = 1.0f, float scaleY = 1.0f) { print(text, x, y, top, layer, align, maxWidth, color, scaleX, scaleY, nullptr); }

	/**
	 * @brief Prints an integer value to a sprite
	 * @param value The value to print
	 * @param x The X position to print at
	 * @param y The Y position to print at
	 * @param sprite The sprite to print to
	 * @param align (Optional) The alignment to use
	 * @param maxWidth (Optional) The maximum width of the string, set to 0 for no max width
	 * @param color (Optional) The color to print in
	 * @param scaleX (Optional) The scale on the X axis
	 * @param scaleY (Optional) The scale on the Y axis
	 */
	void print(int value, int x, int y, Sprite &sprite, Alignment align = Alignment::left, int maxWidth = 0, int color = 0, float scaleX = 1.0f, float scaleY = 1.0f) { print(utf8to16(std::to_string(value)), x, y, false, 0, align, maxWidth, color, scaleX, scaleY, nullptr); }

	/**
	 * @brief Prints a string to a sprite
	 * @param text The string to print
	 * @param x The X position to print at
	 * @param y The Y position to print at
	 * @param sprite The sprite to print to
	 * @param align (Optional) The alignment to use
	 * @param maxWidth (Optional) The maximum width of the string, set to 0 for no max width
	 * @param color (Optional) The color to print in
	 * @param scaleX (Optional) The scale on the X axis
	 * @param scaleY (Optional) The scale on the Y axis
	 */
	void print(std::string_view text, int x, int y, Sprite &sprite, Alignment align = Alignment::left, int maxWidth = 0, int color = 0, float scaleX = 1.0f, float scaleY = 1.0f) { print(utf8to16(text), x, y, false, 0, align, maxWidth, color, scaleX, scaleY, &sprite); }
	void print(std::u16string_view text, int x, int y, Sprite &sprite, Alignment align = Alignment::left, int maxWidth = 0, int color = 0, float scaleX = 1.0f, float scaleY = 1.0f) { print(text, x, y, false, 0, align, maxWidth, color, scaleX, scaleY, &sprite); }

#ifdef TEXT_BUFFERED
	/**
	 * @brief Clears all text from both screens
	 */
	static void clear(void) { clear(true); clear(false); }
	/**
	 * @brief Clears all text from the given screen
	 * @param Whether to clear the top or bottom screen
	 */
	static void clear(bool top);

	/**
	 * @brief Copies all text on both screens from the buffer to actual screen
	 */
	static void update(void) { update(true); update(false); }
	/**
	 * @brief Copies all text on the given screen from the buffer to actual screen
	 * @param top Whether to update the top or bottom screen
	 */
	static void update(bool top);
#endif

};

#endif