/*
 * Copyright 2005 Adrian Lees <adrianl@users.sourceforge.net>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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, see <http://www.gnu.org/licenses/>.
 */

/** \file
 * Content for image/x-artworks (RISC OS implementation).
 *
 * Uses the ArtworksRenderer module
 */

#include "utils/config.h"
#ifdef WITH_ARTWORKS

#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include "swis.h"
#include "oslib/os.h"
#include "oslib/wimp.h"
#include "utils/config.h"
#include "content/content_protected.h"
#include "desktop/plotters.h"
#include "riscos/content-handlers/artworks.h"
#include "riscos/gui.h"
#include "riscos/wimputils.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/utils.h"

#define AWRender_FileInitAddress 0x46080
#define AWRender_RenderAddress   0x46081
#define AWRender_DocBounds       0x46082
#define AWRender_SendDefs        0x46083
#define AWRender_ClaimVectors    0x46084
#define AWRender_ReleaseVectors  0x46085
#define AWRender_FindFirstFont   0x46086
#define AWRender_FindNextFont    0x46087


#define INITIAL_BLOCK_SIZE 0x1000

typedef struct artworks_content {
	struct content base;

	int x0, y0, x1, y1;

	void *render_routine;
	void *render_workspace;

	/* dynamically-resizable block required by
	   ArtWorksRenderer rendering routine */

	void *block;
	size_t size;
} artworks_content;

struct awinfo_block {
	int ditherx;
	int dithery;
	int clip_x0;
	int clip_y0;
	int clip_x1;
	int clip_y1;
	int print_lowx;
	int print_lowy;
	int print_handle;
	int print_x1;
	int print_y1;
	int bgcolour;
};


/* Assembler routines for interfacing with the ArtworksRenderer module */

extern os_error *awrender_init(const char **doc,
		unsigned long *doc_size,
		void *routine,
		void *workspace);

extern os_error *awrender_render(const char *doc,
		const struct awinfo_block *info,
		const os_trfm *trans,
		const int *vdu_vars,
		void **rsz_block,
		size_t *rsz_size,
		int wysiwyg_setting,
		int output_dest,
		size_t doc_size,
		void *routine,
		void *workspace);

static nserror artworks_create(const content_handler *handler,
		lwc_string *imime_type, const http_parameter *params,
		llcache_handle *llcache, const char *fallback_charset,
		bool quirks, struct content **c);
static bool artworks_convert(struct content *c);
static void artworks_destroy(struct content *c);
static bool artworks_redraw(struct content *c, struct content_redraw_data *data,
		const struct rect *clip, const struct redraw_context *ctx);
static nserror artworks_clone(const struct content *old, struct content **newc);
static content_type artworks_content_type(lwc_string *mime_type);

static const content_handler artworks_content_handler = {
	.create = artworks_create,
	.data_complete = artworks_convert,
	.destroy = artworks_destroy,
	.redraw = artworks_redraw,
	.clone = artworks_clone,
	.type = artworks_content_type,
	.no_share = false,
};

static const char *artworks_types[] = {
	"image/x-artworks"
};

static lwc_string *artworks_mime_types[NOF_ELEMENTS(artworks_types)];

nserror artworks_init(void)
{
	uint32_t i;
	lwc_error lerror;
	nserror error;

	for (i = 0; i < NOF_ELEMENTS(artworks_mime_types); i++) {
		lerror = lwc_intern_string(artworks_types[i],
				strlen(artworks_types[i]),
				&artworks_mime_types[i]);
		if (lerror != lwc_error_ok) {
			error = NSERROR_NOMEM;
			goto error;
		}

		error = content_factory_register_handler(artworks_mime_types[i],
				&artworks_content_handler);
		if (error != NSERROR_OK)
			goto error;
	}

	return NSERROR_OK;

error:
	artworks_fini();

	return error;
}

void artworks_fini(void)
{
	uint32_t i;

	for (i = 0; i < NOF_ELEMENTS(artworks_mime_types); i++) {
		if (artworks_mime_types[i] != NULL)
			lwc_string_unref(artworks_mime_types[i]);
	}
}

nserror artworks_create(const content_handler *handler,
		lwc_string *imime_type, const http_parameter *params,
		llcache_handle *llcache, const char *fallback_charset,
		bool quirks, struct content **c)
{
	artworks_content *aw;
	nserror error;

	aw = talloc_zero(0, artworks_content);
	if (aw == NULL)
		return NSERROR_NOMEM;

	error = content__init(&aw->base, handler, imime_type, params,
			llcache, fallback_charset, quirks);
	if (error != NSERROR_OK) {
		talloc_free(aw);
		return error;
	}

	*c = (struct content *) aw;

	return NSERROR_OK;
}

/**
 * Convert a CONTENT_ARTWORKS for display.
 *
 * No conversion is necessary. We merely read the ArtWorks
 * bounding box bottom-left.
 */

bool artworks_convert(struct content *c)
{
	artworks_content *aw = (artworks_content *) c;
	union content_msg_data msg_data;
	const char *source_data;
	unsigned long source_size;
	void *init_workspace;
	void *init_routine;
	os_error *error;
	int used = -1;  /* slightly better with older OSLib versions */
	char title[100];

	/* check whether AWViewer has been seen and we can therefore
		locate the ArtWorks rendering modules */
	xos_read_var_val_size("Alias$LoadArtWorksModules", 0, os_VARTYPE_STRING,
				&used, NULL, NULL);
	if (used >= 0) {
		LOG(("Alias$LoadArtWorksModules not defined"));
		msg_data.error = messages_get("AWNotSeen");
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	/* load the modules, or do nothing if they're already loaded */
	error = xos_cli("LoadArtWorksModules");
	if (error) {
		LOG(("xos_cli: 0x%x: %s",
				error->errnum, error->errmess));
		msg_data.error = error->errmess;
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	/* lookup the addresses of the init and render routines */
	error = (os_error*)_swix(AWRender_FileInitAddress, _OUT(0) | _OUT(1),
				&init_routine, &init_workspace);
	if (error) {
		LOG(("AWRender_FileInitAddress: 0x%x: %s",
				error->errnum, error->errmess));
		msg_data.error = error->errmess;
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	error = (os_error*)_swix(AWRender_RenderAddress, _OUT(0) | _OUT(1),
				&aw->render_routine,
				&aw->render_workspace);
	if (error) {
		LOG(("AWRender_RenderAddress: 0x%x: %s",
				error->errnum, error->errmess));
		msg_data.error = error->errmess;
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	source_data = content__get_source_data(c, &source_size);

	/* initialise (convert file to new format if required) */
	error = awrender_init(&source_data, &source_size,
			init_routine, init_workspace);
	if (error) {
		LOG(("awrender_init: 0x%x : %s",
			error->errnum, error->errmess));
		msg_data.error = error->errmess;
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	error = (os_error*)_swix(AWRender_DocBounds, 
			_IN(0) | _OUT(2) | _OUT(3) | _OUT(4) | _OUT(5),
			source_data,
			&aw->x0,
			&aw->y0,
			&aw->x1,
			&aw->y1);

	if (error) {
		LOG(("AWRender_DocBounds: 0x%x: %s",
			error->errnum, error->errmess));
		msg_data.error = error->errmess;
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	LOG(("bounding box: %d,%d,%d,%d", aw->x0, aw->y0, aw->x1, aw->y1));

	/* create the resizable workspace required by the
		ArtWorksRenderer rendering routine */

	aw->size = INITIAL_BLOCK_SIZE;
	aw->block = malloc(INITIAL_BLOCK_SIZE);
	if (!aw->block) {
		LOG(("failed to create block for ArtworksRenderer"));
		msg_data.error = messages_get("NoMemory");
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	c->width  = (aw->x1 - aw->x0) / 512;
	c->height = (aw->y1 - aw->y0) / 512;

	snprintf(title, sizeof(title), messages_get("ArtWorksTitle"), 
			c->width, c->height, source_size);
	content__set_title(c, title);
	content_set_ready(c);
	content_set_done(c);
	/* Done: update status bar */
	content_set_status(c, "");
	return true;
}


/**
 * Destroy a CONTENT_ARTWORKS and free all resources it owns.
 */

void artworks_destroy(struct content *c)
{
	artworks_content *aw = (artworks_content *) c;

	free(aw->block);
}


/**
 * Redraw a CONTENT_ARTWORKS.
 */

bool artworks_redraw(struct content *c, struct content_redraw_data *data,
		const struct rect *clip, const struct redraw_context *ctx)
{
	static const ns_os_vdu_var_list vars = {
		os_MODEVAR_XEIG_FACTOR,
		{
			os_MODEVAR_YEIG_FACTOR,
			os_MODEVAR_LOG2_BPP,
			os_VDUVAR_END_LIST
		}
	};
	artworks_content *aw = (artworks_content *) c;
	struct awinfo_block info;
	const char *source_data;
	unsigned long source_size;
	os_error *error;
	os_trfm matrix;
	int vals[24];

	int clip_x0 = clip->x0;
	int clip_y0 = clip->y0;
	int clip_x1 = clip->x1;
	int clip_y1 = clip->y1;

	if (ctx->plot->flush && !ctx->plot->flush())
		return false;

	/* pick up render addresses again in case they've changed
	   (eg. newer AWRender module loaded since we first loaded this file) */
	(void)_swix(AWRender_RenderAddress, _OUT(0) | _OUT(1),
				&aw->render_routine,
				&aw->render_workspace);

	/* Scaled image. Transform units (65536*OS units) */
	matrix.entries[0][0] = data->width * 65536 / c->width;
	matrix.entries[0][1] = 0;
	matrix.entries[1][0] = 0;
	matrix.entries[1][1] = data->height * 65536 / c->height;
	/* Draw units. (x,y) = bottom left */
	matrix.entries[2][0] = ro_plot_origin_x * 256 + data->x * 512 -
			aw->x0 * data->width / c->width;
	matrix.entries[2][1] = ro_plot_origin_y * 256 -
			(data->y + data->height) * 512 -
			aw->y0 * data->height / c->height;

	info.ditherx = ro_plot_origin_x;
	info.dithery = ro_plot_origin_y;

	clip_x0 -= data->x;
	clip_y0 -= data->y;
	clip_x1 -= data->x;
	clip_y1 -= data->y;

	if (data->scale == 1.0) {
		info.clip_x0 = (clip_x0 * 512) + aw->x0 - 511;
		info.clip_y0 = ((c->height - clip_y1) * 512) + aw->y0 - 511;
		info.clip_x1 = (clip_x1 * 512) + aw->x0 + 511;
		info.clip_y1 = ((c->height - clip_y0) * 512) + aw->y0 + 511;
	}
	else {
		info.clip_x0 = (clip_x0 * 512 / data->scale) + aw->x0 - 511;
		info.clip_y0 = ((c->height - (clip_y1 / data->scale)) * 512) +
				aw->y0 - 511;
		info.clip_x1 = (clip_x1 * 512 / data->scale) + aw->x0 + 511;
		info.clip_y1 = ((c->height - (clip_y0 / data->scale)) * 512) +
				aw->y0 + 511;
	}

	info.print_lowx = 0;
	info.print_lowy = 0;
	info.print_handle = 0;
	info.bgcolour = 0x20000000 | data->background_colour;

	error = xos_read_vdu_variables(PTR_OS_VDU_VAR_LIST(&vars), vals);
	if (error) {
		LOG(("xos_read_vdu_variables: 0x%x: %s",
			error->errnum, error->errmess));
		return false;
	}

	error = xwimp_read_palette((os_palette*)&vals[3]);
	if (error) {
		LOG(("xwimp_read_palette: 0x%x: %s",
			error->errnum, error->errmess));
		return false;
	}

	source_data = content__get_source_data(c, &source_size);

	error = awrender_render(source_data,
			&info,
			&matrix,
			vals,
			&aw->block,
			&aw->size,
			110,	/* fully anti-aliased */
			0,
			source_size,
			aw->render_routine,
			aw->render_workspace);

	if (error) {
		LOG(("awrender_render: 0x%x: %s",
				error->errnum, error->errmess));
		return false;
	}

	return true;
}

nserror artworks_clone(const struct content *old, struct content **newc)
{
	artworks_content *aw;
	nserror error;

	aw = talloc_zero(0, artworks_content);
	if (aw == NULL)
		return NSERROR_NOMEM;

	error = content__clone(old, &aw->base);
	if (error != NSERROR_OK) {
		content_destroy(&aw->base);
		return error;
	}

	/* Simply re-run convert */
	if (old->status == CONTENT_STATUS_READY || 
			old->status == CONTENT_STATUS_DONE) {
		if (artworks_convert(&aw->base) == false) {
			content_destroy(&aw->base);
			return NSERROR_CLONE_FAILED;
		}
	}

	*newc = (struct content *) aw;

	return NSERROR_OK;
}

content_type artworks_content_type(lwc_string *mime_type)
{
	return CONTENT_IMAGE;
}

#endif