/*
 *  Copyright (C) 2000-2022  The Exult Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef SHAPEID_H
#define SHAPEID_H 1

#include "endianio.h"
#include "exult_constants.h"
#include "fontvga.h"
#include "shapevga.h"
#include "singles.h"

#include <memory>
#include <vector>
#include <optional>

class Shape_frame;
class Shape_info;
class Font;
class Image_buffer;
class Image_buffer8;
struct Cursor_info;

enum ShapeFile {
	SF_SHAPES_VGA = 0,    // <STATIC>/shapes.vga.  MUST be first.
	SF_GUMPS_VGA,         // <STATIC>/gumps.vga
	SF_PAPERDOL_VGA,      // <STATIC>/paperdol.vga
	SF_SPRITES_VGA,       // <STATIC>/sprites.vga
	SF_FACES_VGA,         // <STATIC>/faces.vga
	SF_EXULT_FLX,         // <DATA>/exult.flx
	SF_GAME_FLX,          // <DATA>/bg_data.flx or <DATA>/si_data.flx
	// Not yet
	// SF_FONTS_VGA,     // <STATIC>/fonts.vga
	SF_OTHER,    // Other unknown FLX
	SF_COUNT     // # of preceding entries.
};

// Special pixels.
enum Pixel_colors {
	POISON_PIXEL = 0,
	PROTECT_PIXEL,
	CURSED_PIXEL,
	CHARMED_PIXEL,
	HIT_PIXEL,
	PARALYZE_PIXEL,
	BLACK_PIXEL,
	NPIXCOLORS
};

/*
 *  Manage the set of shape files.
 */
class Shape_manager : public Game_singletons {
public:
	struct Cached_shape {
		Shape_frame* shape;
		bool         has_trans;
	};

private:
	static Shape_manager* instance;                // There shall be only one.
	Shapes_vga_file       shapes;                  // Main 'shapes.vga' file.
	Vga_file files[static_cast<int>(SF_COUNT)];    // The files we manage.
	std::unique_ptr<Fonts_vga_file> fonts = nullptr;    // "fonts.vga" file.
	std::vector<Xform_palette>      xforms;    // Transforms translucent colors
	//   0xf4 through 0xfe.
	Xform_palette* invis_xform;    // For showing invisible NPC's.
	unsigned char  special_pixels[NPIXCOLORS];    // Special colors.
	bool can_have_paperdolls = false;    // Set true if the SI paperdoll file
	//   is found when playing BG
	bool paperdolls_enabled = false;    // True if paperdolls are on.
	bool got_si_shapes      = false;    // Set true if the SI shapes file
	//   is found when playing BG
	using Shape_cache = std::map<std::pair<int, int>, Cached_shape>;
	Shape_cache shape_cache[static_cast<int>(SF_COUNT)];
	void        read_shape_info();

public:
	friend class ShapeID;
	Shape_manager();
	~Shape_manager();

	static Shape_manager* get_instance() {
		return instance;
	}

	void load();                  // Read in files.
	bool load_gumps_minimal();    // Read in files needed to display gumps.
	void reload_shapes(int shape_kind);    // Reload a shape file.
	void reload_shape_info();

	bool are_gumps_loaded() {
		return !shape_cache[SF_GUMPS_VGA].empty();
	}

	Vga_file& get_file(ShapeFile f) {
		return files[static_cast<int>(f)];
	}

	Shapes_vga_file& get_shapes() {
		return shapes;
	}

	inline Xform_palette& get_xform(int i) {
		return xforms[i];
	}

	// BG Only
	inline bool can_use_paperdolls() const {
		return can_have_paperdolls;
	}

	inline bool are_paperdolls_enabled() const {
		return paperdolls_enabled;
	}

	inline void set_paperdoll_status(bool p) {
		paperdolls_enabled = p;
	}

	inline bool have_si_shapes() const {
		return got_si_shapes;
	}

	// Paint shape in window.
	void paint_shape(
			int xoff, int yoff, Shape_frame* shape, bool translucent = false,
			unsigned char* trans = nullptr) {
		if (!shape || !shape->get_data()) {
			CERR("nullptr SHAPE!!!");
		} else if (!shape->is_rle()) {
			shape->paint(xoff, yoff);
		} else if (trans) {
			shape->paint_rle_remapped(xoff, yoff, trans);
		} else if (!translucent) {
			shape->paint_rle(xoff, yoff);
		} else {
			shape->paint_rle_translucent(
					xoff, yoff, xforms.data(), xforms.size());
		}
	}

	inline void paint_invisible(int xoff, int yoff, Shape_frame* shape) {
		if (shape) {
			shape->paint_rle_transformed(xoff, yoff, *invis_xform);
		}
	}

	// Paint outline around a shape.
	inline void paint_outline(
			int xoff, int yoff, Shape_frame* shape, Pixel_colors pix) {
		if (shape) {
			shape->paint_rle_outline(
					xoff, yoff, special_pixels[static_cast<int>(pix)]);
		}
	}

	unsigned char get_special_pixel(Pixel_colors pix) {
		return special_pixels[static_cast<int>(pix)];
	}

	// Paint text using "fonts.vga".
	int paint_text_box(
			int fontnum, const char* text, int x, int y, int w, int h,
			int vert_lead = 0, bool pbreak = false, bool center = false,
			int shading = -1, Cursor_info* cursor = nullptr);
	int paint_text(int fontnum, const char* text, int xoff, int yoff);
	int paint_text(
			int fontnum, const char* text, int textlen, int xoff, int yoff);
	int paint_text(
			std::shared_ptr<Font> font, const char* text, int xoff, int yoff);
	int paint_text(
			std::shared_ptr<Font> font, const char* text, int textlen, int xoff,
			int yoff);
	// Get text width.
	int get_text_width(int fontnum, const char* text);
	int get_text_width(int fontnum, const char* text, int textlen);
	// Get text height, baseline.
	int get_text_height(int fontnum);
	int get_text_baseline(int fontnum);
	int find_cursor(
			int fontnum, const char* text, int x, int y, int w, int h, int cx,
			int cy, int vert_lead);
	std::shared_ptr<Font> get_font(int fontnum);

	size_t get_xforms_cnt() const {
		return xforms.size();
	}

	Cached_shape cache_shape(int shape_kind, int shapenum, int framenum);
};

/*
 *  A shape ID contains a shape # and a frame # within the shape encoded
 *  as a 2-byte quantity.
 */
class ShapeID : public Game_singletons {
	short       shapenum          = -1;    // Shape #.
	signed char framenum          = -1;    // Frame # within shape.
	uint16      palette_transform = 0;

	ShapeFile shapefile = SF_SHAPES_VGA;

	Shape_manager::Cached_shape cache_shape() const;

public:
	// Read from buffer & incr. ptr.
	ShapeID(unsigned char*& data) {
		const unsigned char l = Read1(data);
		const unsigned char h = Read1(data);
		shapenum              = l + 256 * (h & 0x3);
		framenum              = h >> 2;
		// this is not saved
		palette_transform = 0;
	}

	// Create "end-of-list"/invalid entry.
	ShapeID() = default;

	ShapeID(const ShapeID&)                = default;
	ShapeID& operator=(const ShapeID&)     = default;
	ShapeID(ShapeID&&) noexcept            = default;
	ShapeID& operator=(ShapeID&&) noexcept = default;
	virtual ~ShapeID()                     = default;

	// End-of-list or invalid?
	bool is_invalid() const {
		return shapenum == -1;
	}

	bool is_eol() const {
		return is_invalid();
	}

	inline int get_shapenum() const {
		return shapenum;
	}

	inline int get_framenum() const {
		return framenum;
	}

	inline ShapeFile get_shapefile() const {
		return shapefile;
	}

	inline Shape_frame* get_shape() const {
		return cache_shape().shape;
	}

	inline bool is_translucent() const {
		return cache_shape().has_trans;
	}

	// Set to given shape.
	void set_shape(int shnum, int frnum) {
		shapenum = shnum;
		framenum = frnum;
	}

	ShapeID(int shnum, int frnum, ShapeFile shfile = SF_SHAPES_VGA)
			: shapenum(shnum), framenum(frnum), palette_transform(0),
			  shapefile(shfile) {}

	void set_shape(int shnum) {    // Set shape, but keep old frame #.
		shapenum = shnum;
	}

	void set_frame(int frnum) {    // Set to new frame.
		framenum = frnum;
	}

	//
	// Palette transformations
	//
	// see comment on set_palette_transform for what this is all about
	//

public:
	//! Palette tranformation types to use with #set_palette_transform
	enum PaletteTransformType {
		//! Basic palette index shift
		//! Use PT_Shift|(offset mod 256)
		PT_Shift = 0,

		//!  transform using an xform table as if there was a transparent
		//!  overlay drawn over the
		//! shape  Use (PT_xForm|xform number)
		PT_xForm = 1 << 8,

		//! Ramp remapping to remaap a single ramp
		//! Use (PT_RampRemap|rampfrom<<5|rampto&31)
		PT_RampRemap = 1 << 15,

		//! Ramp remapping to remap all ramps.
		//! Use (PT_RampRemapAllFrom|rampto&31)
		PT_RampRemapAllFrom = PT_RampRemap | 255 << 5
	};

	//! Palette transformation to use when painting shape if not transparent.
	//! \param pt New Palette transform to use. See ShapeId::PaletteTransformType
	//! \remark Note Behaviour on palette cycling, a shift can shift a colour into
	//! the palette cycling range for interesting effects, or shift cycling
	//! colours out of the range Xform will get rid of all palette cycling
	//! effects.
	void set_palette_transform(int pt) {
		palette_transform = pt;
	}

	int get_palette_transform() const {
		return palette_transform;
	}

	void set_file(ShapeFile shfile) {    // Set to new flex
		shapefile = shfile;
	}

	void paint_shape(
			int xoff, int yoff,
			std::optional<bool> force_trans = std::nullopt) const {
		auto           cache      = cache_shape();
		unsigned char* transtable = nullptr;
		unsigned char  table[256];
		if (palette_transform != 0) {
			transtable = Get_palette_transform_table(table);
		}
		sman->paint_shape(
				xoff, yoff, cache.shape,
				force_trans?*force_trans:cache.has_trans,
				transtable);
	}

	void paint_invisible(int xoff, int yoff) const {
		sman->paint_invisible(xoff, yoff, get_shape());
	}

	// Paint outline around a shape.
	inline void paint_outline(int xoff, int yoff, Pixel_colors pix) const {
		sman->paint_outline(xoff, yoff, get_shape(), pix);
	}

	int  get_num_frames() const;
	bool is_frame_empty() const;

	const Shape_info& get_info() const {    // Get info. about shape.
		return Shape_manager::instance->shapes.get_info(shapenum);
	}

	Shape_info& get_info() {    // Get info. about shape.
		return Shape_manager::instance->shapes.get_info(shapenum);
	}

	static Shape_info& get_info(int shnum) {    // Get info. about shape.
		return Shape_manager::instance->shapes.get_info(shnum);
	}

	uint8* Get_palette_transform_table(uint8 table[256]) const;
};

/*
 *  An interface used in Get_click(): This will be painted on top of everything else
 */
class Paintable {
public:
	virtual void paint() = 0;
	virtual ~Paintable() = default;
};

// A paintable that should be painted as a background and not on top of everything.
class BackgroundPaintable : public Paintable {
};

class ImageBufferPaintable : public BackgroundPaintable {
	std::unique_ptr<Image_buffer> buffer;
	int x,y;

public:
	// Construct from an existing Image_buffer
	ImageBufferPaintable(std::unique_ptr<Image_buffer>&& buffer, int x, int y) :
			buffer(std::move(buffer)),
			x(x),y(y) {
	}

	// Construct from a screenshot of the current screen
	ImageBufferPaintable();

	virtual ~ImageBufferPaintable() = default;
	// Inherited via Paintable
	void paint() override;
};
#endif
