/*
	This file is part of Warzone 2100.
	Copyright (C) 1999-2004  Eidos Interactive
	Copyright (C) 2005-2007  Warzone Resurrection Project

	Warzone 2100 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.

	Warzone 2100 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 Warzone 2100; if not, write to the Free Software
	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
 * Screen.c
 *
 * Basic double buffered display using direct draw.
 *
 */

#ifdef WIN32
/* We need this kludge to avoid a redefinition of INT32 in a jpeglib header */
# define XMD_H
#endif

#include <stdio.h>
#include <string.h>
#include <SDL/SDL.h>
#ifdef _MSC_VER
#include <windows.h>  //needed for gl.h!  --Qamly
#endif
#include <SDL/SDL_opengl.h>
#ifdef __cplusplus
extern "C" {
#endif
#include <jpeglib.h>
// the following two lines compromise an ugly hack because some jpeglib.h
// actually contain configure-created defines that conflict with ours!
// man, those jpeglib authors should get a frigging clue...
#undef HAVE_STDDEF_H
#undef HAVE_STDLIB_H
#ifdef __cplusplus
}
#endif
#include <physfs.h>
#include <setjmp.h>

#include "lib/framework/frame.h"
#include "lib/framework/frameint.h"
#include "lib/ivis_common/piestate.h"
#include "lib/ivis_common/pieblitfunc.h"
#include "screen.h"

/* The Current screen size and bit depth */
UDWORD		screenWidth = 0;
UDWORD		screenHeight = 0;
UDWORD		screenDepth = 0;

SDL_Surface     *screen;

/* global used to indicate preferred internal OpenGL format */
int wz_texture_compression;

//backDrop
UWORD*  pBackDropData = NULL;
BOOL    bBackDrop = FALSE;
BOOL    bUpload = FALSE;

//fog
SDWORD	fogColour = 0;

static char screendump_filename[255];
static unsigned int screendump_num = 0;
static BOOL screendump_required = FALSE;

static UDWORD	backDropWidth = BACKDROP_WIDTH;
static UDWORD	backDropHeight = BACKDROP_HEIGHT;
static GLuint backDropTexture = ~0;

static void my_error_exit(j_common_ptr cinfo);

/* Initialise the double buffered display */
BOOL screenInitialise(
			UDWORD		width,		// Display width
			UDWORD		height,		// Display height
			UDWORD		bitDepth,	// Display bit depth
			BOOL		fullScreen	// Whether to start windowed
							// or full screen
			)
{
	static int video_flags = 0;
	int bpp = 0, value;
	GLint glval;

	/* Store the screen information */
	screenWidth = width;
	screenHeight = height;
	screenDepth = bitDepth;

	// Calculate the common flags for windowed and fullscreen modes.
	if (video_flags == 0) {
		// Fetch the video info.
		const SDL_VideoInfo* video_info = SDL_GetVideoInfo();

		if (!video_info) {
			return FALSE;
		}

		// The flags to pass to SDL_SetVideoMode.
		video_flags  = SDL_OPENGL;    // Enable OpenGL in SDL.
		video_flags |= SDL_ANYFORMAT; // Don't emulate requested BPP if not available.
		video_flags |= SDL_HWPALETTE; // Store the palette in hardware.

		// This checks to see if surfaces can be stored in memory.
		if (video_info->hw_available) {
			video_flags |= SDL_HWSURFACE;
		} else {
			video_flags |= SDL_SWSURFACE;
		}

		// This checks if hardware blits can be done.
		if (video_info->blit_hw) {
			video_flags |= SDL_HWACCEL;
		}

		if (fullScreen) {
			video_flags |= SDL_FULLSCREEN;
		}

		// Set the double buffer OpenGL attribute.
		SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

		bpp = SDL_VideoModeOK(width, height, bitDepth, video_flags);
		if (!bpp) {
			debug( LOG_ERROR, "Error: Video mode %dx%d@%dbpp is not supported!\n", width, height, bitDepth );
			return FALSE;
		}
		switch ( bpp )
		{
			case 32:
			case 24:
				SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 );
				SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 );
				SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 );
				SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, 8 );
				SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
				SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 8 );
				break;
			case 16:
				debug( LOG_ERROR, "Warning: Using colour depth of %i instead of %i.", bpp, screenDepth );
				debug( LOG_ERROR, "         You will experience graphics glitches!" );
				SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
				SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 6 );
				SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
				SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
				SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 8 );
				break;
			case 8:
				debug( LOG_ERROR, "Error: You don't want to play Warzone with a bit depth of %i, do you?", bpp );
				exit( 1 );
				break;
			default:
				debug( LOG_ERROR, "Error: Unsupported bit depth: %i", bpp );
				exit( 1 );
				break;
		}
	}

	screen = SDL_SetVideoMode(width, height, bpp, video_flags);
	if ( !screen ) {
		debug( LOG_ERROR, "Error: SDL_SetVideoMode failed (%s).", SDL_GetError() );
		return FALSE;
	}
	if ( SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &value) == -1)
	{
		debug( LOG_ERROR, "OpenGL initialization did not give double buffering!" );
	}
	glGetIntegerv(GL_MAX_TEXTURE_SIZE, &glval);
	debug( LOG_TEXTURE, "Maximum texture size: %dx%d", (int)glval, (int)glval );
	if ( glval < 512 ) // FIXME: Replace by a define that gives us the real maximum
	{
		debug( LOG_ERROR, "OpenGL reports a texture size (%d) that is less than required!", (int)glval );
		debug( LOG_ERROR, "This is either a bug in OpenGL or your graphics card is really old!" );
		debug( LOG_ERROR, "Trying to run the game anyway..." );
	}

	glViewport(0, 0, width, height);
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	glOrtho(0, width, height, 0, 1, -1);
	glMatrixMode(GL_TEXTURE);
	glScalef(1/256.0, 1/256.0, 1);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glCullFace(GL_FRONT);
	glEnable(GL_CULL_FACE);

	return TRUE;
}


/* Release the DD objects */
void screenShutDown(void)
{
	if (screen != NULL)
	{
		SDL_FreeSurface(screen);
	}
}

/* Return a pointer to the back buffer surface */
void *screenGetSurface(void)
{
	return NULL;
}

void screen_SetBackDrop(UWORD *newBackDropBmp, UDWORD width, UDWORD height)
{
	bBackDrop = TRUE;
	pBackDropData = newBackDropBmp;
	backDropWidth = width;
	backDropHeight = height;
}

BOOL image_init(pie_image* image)
{
	if (image == NULL) return TRUE;

	image->width = 0;
	image->height = 0;
	image->channels = 0;
	image->data = NULL;

	return FALSE;
}

BOOL image_create(pie_image* image,
		  unsigned int width,
		  unsigned int height,
		  unsigned int channels)
{
	if (image == NULL) return TRUE;

	image->width = width;
	image->height = height;
	image->channels = channels;
	if (image->data != NULL) {
		free(image->data);
	}
	image->data = (unsigned char*)malloc(width*height*channels);

	return FALSE;
}

BOOL image_delete(pie_image* image)
{
	if (image == NULL) return TRUE;

	if (image->data != NULL) {
		free(image->data);
		image->data = NULL;
	}

	return FALSE;
}

typedef struct my_error_mgr {
  struct jpeg_error_mgr pub;
  jmp_buf setjmp_buffer;
}* my_error_ptr;

static void my_error_exit(j_common_ptr cinfo)
{
  my_error_ptr myerr = (my_error_ptr) cinfo->err;
  longjmp(myerr->setjmp_buffer, 1);
}

METHODDEF(void) init_source( WZ_DECL_UNUSED j_decompress_ptr cinfo ) {}

METHODDEF(boolean) fill_input_buffer(j_decompress_ptr cinfo)
{
  static JOCTET dummy[] = { (JOCTET) 0xFF, (JOCTET) JPEG_EOI };

  /* Insert a fake EOI marker */
  cinfo->src->next_input_byte = dummy;
  cinfo->src->bytes_in_buffer = 2;

  return TRUE;
}

METHODDEF(void) skip_input_data( j_decompress_ptr cinfo, long num_bytes )
{
	if (num_bytes > 0) {
		while (num_bytes > (long) cinfo->src->bytes_in_buffer) {
			num_bytes -= (long) cinfo->src->bytes_in_buffer;
			(void) fill_input_buffer(cinfo);
		}
		cinfo->src->next_input_byte += (size_t) num_bytes;
		cinfo->src->bytes_in_buffer -= (size_t) num_bytes;
	}
}

METHODDEF(void) term_source( WZ_DECL_UNUSED j_decompress_ptr cinfo ) {}

BOOL image_load_from_jpg(pie_image* image, const char* filename)
{
	struct jpeg_decompress_struct cinfo;
	struct my_error_mgr jerr;
	int row_stride;
	int image_size;
	uintptr_t tmp;
	JSAMPARRAY ptr[1];
	struct jpeg_source_mgr jsrc;
	char *buffer;
	UDWORD fsize;

	if (image == NULL) return TRUE;

	if (!loadFile(filename, &buffer, &fsize)) {
		debug(LOG_ERROR, "Could not load backdrop file \"%s\"!", filename);
		return TRUE;
	}

	jpeg_create_decompress(&cinfo);
	cinfo.src = &jsrc;
	jsrc.init_source = init_source;
	jsrc.fill_input_buffer = fill_input_buffer;
	jsrc.skip_input_data = skip_input_data;
	jsrc.resync_to_restart = jpeg_resync_to_restart;
	jsrc.term_source = term_source;
	jsrc.bytes_in_buffer = fsize;
	jsrc.next_input_byte = (JOCTET *)buffer;

	cinfo.err = jpeg_std_error(&jerr.pub);
	jerr.pub.error_exit = my_error_exit;

	if (setjmp(jerr.setjmp_buffer)) {
		jpeg_destroy_decompress(&cinfo);
		debug(LOG_ERROR, "Error during jpg decompression of \"%s\"!", filename);
		FREE(buffer);
		return TRUE;
	}
	jpeg_read_header(&cinfo, TRUE);

	cinfo.out_color_space = JCS_RGB;
	cinfo.quantize_colors = FALSE;
	cinfo.scale_num   = 1;
	cinfo.scale_denom = 1;
	cinfo.dct_method = JDCT_FASTEST;
	cinfo.do_fancy_upsampling = FALSE;

	jpeg_calc_output_dimensions(&cinfo);

	row_stride = cinfo.output_width * cinfo.output_components;
	image_size = row_stride * cinfo.output_height;

	image_create(image, cinfo.output_width, cinfo.output_height, cinfo.output_components);

	jpeg_start_decompress(&cinfo);

	tmp = (uintptr_t)image->data;
	while (cinfo.output_scanline < cinfo.output_height) {
		ptr[0] = (JSAMPARRAY)tmp;
		jpeg_read_scanlines(&cinfo, (JSAMPARRAY)ptr, 1);
		tmp += row_stride;
	}
	jpeg_finish_decompress(&cinfo);
	jpeg_destroy_decompress(&cinfo);

	FREE(buffer);

	return FALSE;
}

//=====================================================================

#if 0
static GLuint image_create_texture(char* filename) {
	pie_image image;
	GLuint texture;

	image_init(&image);

	if (!image_load_from_jpg(&image, filename)) {
		glGenTextures(1, &texture);

		pie_SetTexturePage(-1);
		glBindTexture(GL_TEXTURE_2D, texture);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
			     image.width, image.height,
			     0, GL_RGB, GL_UNSIGNED_BYTE, image.data);
		glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	}

	image_delete(&image);

	return texture;
}
#endif
//=====================================================================

void screen_SetBackDropFromFile(char* filename)
{
	// HACK : We should use a resource handler here!
	char *extension = strrchr(filename, '.');// determine the filetype

	if(!extension)
	{
		debug(LOG_ERROR, "Image without extension: \"%s\"!", filename);
		return; // filename without extension... don't bother
	}

	// Make sure the current texture page is reloaded after we are finished
	// Otherwise WZ will think it is still loaded and not load it again
	pie_SetTexturePage(-1);

	if( strcmp(extension,".jpg") == 0 || strcmp(extension,".jpeg") == 0 )
	{
		pie_image image;

		image_init(&image);

		if (!image_load_from_jpg(&image, filename)) {
			if (~backDropTexture == 0)
				glGenTextures(1, &backDropTexture);

			glBindTexture(GL_TEXTURE_2D, backDropTexture);
			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
					image.width, image.height,
					0, GL_RGB, GL_UNSIGNED_BYTE, image.data);
			glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
		}

		image_delete(&image);
		return;
	}
	else if( strcmp(extension,".png") == 0 )
	{
		iTexture imagePNG;
		char * buffer = NULL;
		unsigned int dummy = 0;

		if (loadFile( filename, &buffer, &dummy ) && pie_PNGLoadMem( buffer, &imagePNG ) )
		{
			if (~backDropTexture == 0)
				glGenTextures(1, &backDropTexture);

			glBindTexture(GL_TEXTURE_2D, backDropTexture);
			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
					imagePNG.width, imagePNG.height,
					0, GL_RGBA, GL_UNSIGNED_BYTE, imagePNG.bmp);
			glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

			free(imagePNG.bmp);
		}
		FREE(buffer);
		return;
	}
	else
		debug(LOG_ERROR, "Unknown extension \"%s\" for image \"%s\"!", extension, filename);
}
//===================================================================

void screen_StopBackDrop(void)
{
	bBackDrop = FALSE;	//checking [movie]
}

void screen_RestartBackDrop(void)
{
	bBackDrop = TRUE;
}

BOOL screen_GetBackDrop(void)
{
	return bBackDrop;
}
//******************************************************************
//slight hack to display maps (or whatever) in background.
//bitmap MUST be (BACKDROP_HACK_WIDTH * BACKDROP_HACK_HEIGHT) for now.
void screen_Upload(char *newBackDropBmp)
{
	if(newBackDropBmp != NULL)
	{
		glGenTextures(1, &backDropTexture);
		pie_SetTexturePage(-1);
		glBindTexture(GL_TEXTURE_2D, backDropTexture);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
			BACKDROP_HACK_WIDTH, BACKDROP_HACK_HEIGHT,
			0, GL_RGB, GL_UNSIGNED_BYTE, newBackDropBmp);

		glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	}

	glDisable(GL_DEPTH_TEST);
	glDepthMask(GL_FALSE);

	// Make sure the current texture page is reloaded after we are finished
	// Otherwise WZ will think it is still loaded and not load it again
	pie_SetTexturePage(-1);

	glEnable(GL_TEXTURE_2D);
	glBindTexture(GL_TEXTURE_2D, backDropTexture);
	glColor3f(1, 1, 1);

	glBegin(GL_TRIANGLE_STRIP);
		glTexCoord2f(0, 0);
		glVertex2f(0, 0);
		glTexCoord2f(255, 0);
		glVertex2f(screenWidth, 0);
		glTexCoord2f(0, 255);
		glVertex2f(0, screenHeight);
		glTexCoord2f(255, 255);
		glVertex2f(screenWidth, screenHeight);
	glEnd();
}

/* Swap between windowed and full screen mode */
void screenToggleMode(void)
{
	(void) SDL_WM_ToggleFullScreen(screen);
}

#define BUFFER_SIZE 4096

typedef struct {
	struct jpeg_destination_mgr pub;
	PHYSFS_file* file;
	JOCTET * buffer;
} my_jpeg_destination_mgr;

METHODDEF(void) init_destination(j_compress_ptr cinfo)
{
	my_jpeg_destination_mgr* dm = (my_jpeg_destination_mgr*)(cinfo->dest);

	/* Allocate the output buffer --- it will be released when done with image */
	dm->buffer = (JOCTET *)malloc(BUFFER_SIZE*sizeof(JOCTET));

	dm->pub.next_output_byte = dm->buffer;
	dm->pub.free_in_buffer = BUFFER_SIZE;
}

METHODDEF(boolean) empty_output_buffer(j_compress_ptr cinfo)
{
	my_jpeg_destination_mgr* dm = (my_jpeg_destination_mgr*)cinfo->dest;

	PHYSFS_write(dm->file, dm->buffer, BUFFER_SIZE, 1);

	dm->pub.next_output_byte = dm->buffer;
	dm->pub.free_in_buffer = BUFFER_SIZE;

  return TRUE;
}

METHODDEF(void) term_destination(j_compress_ptr cinfo) {
	my_jpeg_destination_mgr* dm = (my_jpeg_destination_mgr*)cinfo->dest;

	PHYSFS_write(dm->file, dm->buffer, BUFFER_SIZE-dm->pub.free_in_buffer, 1);

	free(dm->buffer);
}

void screenDoDumpToDiskIfRequired(void)
{
	static unsigned char* buffer = NULL;
	static unsigned int buffer_size = 0;
	struct jpeg_compress_struct cinfo;
	struct jpeg_error_mgr jerr;
	my_jpeg_destination_mgr jdest;
	JSAMPROW row_pointer[1];
	unsigned int row_stride;

	if (!screendump_required) return;

	row_stride = screen->w * 3;

	if (row_stride * screen->h > buffer_size) {
		if (buffer != NULL) {
			free(buffer);
		}
		buffer_size = row_stride * screen->h;
		buffer = (unsigned char*)malloc(buffer_size);
	}
	glReadPixels(0, 0, screen->w, screen->h, GL_RGB, GL_UNSIGNED_BYTE, buffer);

	screendump_required = FALSE;

	if ((jdest.file = PHYSFS_openWrite(screendump_filename)) == NULL) {
		return;
	}

	debug( LOG_3D, "Saving screenshot %s\n", screendump_filename );

	cinfo.err = jpeg_std_error(&jerr);
	jpeg_create_compress(&cinfo);
	cinfo.dest = &jdest.pub;
	jdest.pub.init_destination = init_destination;
	jdest.pub.empty_output_buffer = empty_output_buffer;
	jdest.pub.term_destination = term_destination;

	cinfo.image_width = screen->w;
	cinfo.image_height = screen->h;
	cinfo.input_components = 3;
	cinfo.in_color_space = JCS_RGB;

	jpeg_set_defaults(&cinfo);
	jpeg_set_quality(&cinfo, 75, TRUE);

	jpeg_start_compress(&cinfo, TRUE);

	while (cinfo.next_scanline < cinfo.image_height) {
		row_pointer[0] = & buffer[(screen->h-cinfo.next_scanline-1) * row_stride];
		jpeg_write_scanlines(&cinfo, row_pointer, 1);
	}

	jpeg_finish_compress(&cinfo);
	PHYSFS_close(jdest.file);
	jpeg_destroy_compress(&cinfo);
}

char* screenDumpToDisk(char* path) {
	while (1) {
		sprintf(screendump_filename, "%s%swz2100_shot_%03i.jpg", path, "/", ++screendump_num);
		if (!PHYSFS_exists(screendump_filename)) {
			break;
		}
	}

	screendump_required = TRUE;

	return screendump_filename;
}

/* Output text to the display screen at location x,y.
 * The remaining arguments are as printf.
 * Used only in now disabled code. Keep for now, though. - Per
 *
void screenTextOut(UDWORD x, UDWORD y, const char *pFormat, ...)
{
}
 */