/* Use one mosiaced file to mosaic another set of images.
 *
 * 1/11/01 JC
 *	- from global_balance
 * 25/02/02 JC
 *	- detect size change
 * 10/4/06
 * 	- spot file-not-found
 * 18/6/20 kleisauke
 * 	- convert to vips8
 */

/*

	This file is part of VIPS.

	VIPS is free software; you can redistribute it and/or modify
	it under the terms of the GNU Lesser 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 Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	02110-1301  USA

 */

/*

	These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk

 */

/* Define for debug output.
#define DEBUG
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <math.h>

#include <vips/vips.h>
#include <vips/transform.h>

#include "pmosaicing.h"
#include "global_balance.h"

typedef struct {
	VipsOperation parent_instance;

	VipsImage *in;
	VipsImage *out;
	char *old_str;
	char *new_str;

	int new_len;
	int old_len;

} VipsRemosaic;

typedef VipsOperationClass VipsRemosaicClass;

G_DEFINE_TYPE(VipsRemosaic, vips_remosaic, VIPS_TYPE_OPERATION);

static VipsImage *
remosaic_fn(JoinNode *node, VipsRemosaic *remosaic)
{
	SymbolTable *st = node->st;
	VipsImage *im = node->im;

	VipsImage *out;
	char filename[FILENAME_MAX];
	char *p;

	if (!im) {
		vips_error("vips_remosaic", _("file \"%s\" not found"),
			node->name);
		return NULL;
	}

	/* Remove substring remosaic->old_str from in->filename, replace with
	 * remosaic->new_str.
	 */
	vips_strncpy(filename, im->filename, FILENAME_MAX);
	if ((p = vips_strrstr(filename, remosaic->old_str))) {
		int offset = p - &filename[0];

		vips_strncpy(p, remosaic->new_str, FILENAME_MAX - offset);
		vips_strncpy(p + remosaic->new_len,
			im->filename + offset + remosaic->old_len,
			FILENAME_MAX - offset - remosaic->new_len);
	}

#ifdef DEBUG
	printf("vips_remosaic: filename \"%s\" -> \"%s\"\n",
		im->filename, filename);
#endif /*DEBUG*/

	if (!(out = vips__global_open_image(st, filename)))
		return NULL;

	if (out->Xsize != im->Xsize || out->Ysize != im->Ysize) {
		vips_error("vips_remosaic",
			_("substitute image \"%s\" is not the same size as \"%s\""),
			filename, im->filename);
		return NULL;
	}

	return out;
}

static int
vips_remosaic_build(VipsObject *object)
{
	VipsRemosaic *remosaic = (VipsRemosaic *) object;

	SymbolTable *st;

	g_object_set(remosaic, "out", vips_image_new(), NULL);

	if (VIPS_OBJECT_CLASS(vips_remosaic_parent_class)->build(object))
		return -1;

	if (!(st = vips__build_symtab(remosaic->out, SYM_TAB_SIZE)) ||
		vips__parse_desc(st, remosaic->in))
		return -1;

	remosaic->old_len = strlen(remosaic->old_str);
	remosaic->new_len = strlen(remosaic->new_str);
	if (vips__build_mosaic(st, remosaic->out,
			(transform_fn) remosaic_fn, remosaic))
		return -1;

	return 0;
}

static void
vips_remosaic_class_init(VipsRemosaicClass *class)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS(class);
	VipsObjectClass *object_class = (VipsObjectClass *) class;

	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	object_class->nickname = "remosaic";
	object_class->description = _("rebuild an mosaiced image");
	object_class->build = vips_remosaic_build;

	VIPS_ARG_IMAGE(class, "in", 1,
		_("Input"),
		_("Input image"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsRemosaic, in));

	VIPS_ARG_IMAGE(class, "out", 2,
		_("Output"),
		_("Output image"),
		VIPS_ARGUMENT_REQUIRED_OUTPUT,
		G_STRUCT_OFFSET(VipsRemosaic, out));

	VIPS_ARG_STRING(class, "old_str", 5,
		_("old_str"),
		_("Search for this string"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsRemosaic, old_str),
		"");

	VIPS_ARG_STRING(class, "new_str", 6,
		_("new_str"),
		_("And swap for this string"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsRemosaic, new_str),
		"");
}

static void
vips_remosaic_init(VipsRemosaic *remosaic)
{
}

/**
 * vips_remosaic: (method)
 * @in: mosaic to rebuild
 * @out: (out): output image
 * @old_str: gamma of source images
 * @new_str: gamma of source images
 * @...: %NULL-terminated list of optional named arguments
 *
 * vips_remosaic() works rather as vips_globalbalance(). It takes apart the
 * mosaiced image @in and rebuilds it, substituting images.
 *
 * Unlike vips_globalbalance(), images are substituted based on their file‐
 * names.  The  rightmost  occurrence  of the string @old_str is swapped
 * for @new_str, that file is opened, and that image substituted  for
 * the old image.
 *
 * It's convenient for multispectral images. You can mosaic one band, then
 * use that mosaic as a template for mosaicing the others automatically.
 *
 * See also: vips_globalbalance().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_remosaic(VipsImage *in, VipsImage **out,
	const char *old_str, const char *new_str, ...)
{
	va_list ap;
	int result;

	va_start(ap, new_str);
	result = vips_call_split("remosaic", ap, in, out, old_str, new_str);
	va_end(ap);

	return result;
}
