/*
 * $Id$
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2008 Blender Foundation.
 * All rights reserved.
 *
 * 
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/editors/space_file/filesel.c
 *  \ingroup spfile
 */


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

#include <sys/stat.h>
#include <sys/types.h>

#ifdef WIN32
#include <io.h>
#include <direct.h>
#include "BLI_winstuff.h"
#else
#include <unistd.h>
#include <sys/times.h>
#endif   

/* path/file handeling stuff */
#ifndef WIN32
  #include <dirent.h>
  #include <unistd.h>
#else
  #include <io.h>
  #include "BLI_winstuff.h"
#endif

#include "DNA_space_types.h"
#include "DNA_screen_types.h"
#include "DNA_userdef_types.h"

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_linklist.h"
#include "BLI_path_util.h"
#include "BLI_storage_types.h"
#include "BLI_dynstr.h"
#include "BLI_utildefines.h"

#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_main.h"

#include "BLF_api.h"


#include "ED_fileselect.h"

#include "WM_api.h"
#include "WM_types.h"


#include "RNA_access.h"

#include "UI_interface.h"
#include "UI_interface_icons.h"

#include "file_intern.h"
#include "filelist.h"

#if defined WIN32 && !defined _LIBC
# include "BLI_fnmatch.h" /* use fnmatch included in blenlib */
#else
# include <fnmatch.h>
#endif

FileSelectParams* ED_fileselect_get_params(struct SpaceFile *sfile)
{
	if (!sfile->params) {
		ED_fileselect_set_params(sfile);
	}
	return sfile->params;
}

short ED_fileselect_set_params(SpaceFile *sfile)
{
	FileSelectParams *params;
	wmOperator *op = sfile->op;

	/* create new parameters if necessary */
	if (!sfile->params) {
		sfile->params= MEM_callocN(sizeof(FileSelectParams), "fileselparams");
		/* set path to most recently opened .blend */
		BLI_split_dirfile(G.main->name, sfile->params->dir, sfile->params->file);
		sfile->params->filter_glob[0] = '\0';
	}

	params = sfile->params;

	/* set the parameters from the operator, if it exists */
	if (op) {
		const short is_files= (RNA_struct_find_property(op->ptr, "files") != NULL);
		const short is_filepath= (RNA_struct_find_property(op->ptr, "filepath") != NULL);
		const short is_filename= (RNA_struct_find_property(op->ptr, "filename") != NULL);
		const short is_directory= (RNA_struct_find_property(op->ptr, "directory") != NULL);

		BLI_strncpy(params->title, op->type->name, sizeof(params->title));

		if(RNA_struct_find_property(op->ptr, "filemode"))
			params->type = RNA_int_get(op->ptr, "filemode");
		else
			params->type = FILE_SPECIAL;

		if (is_filepath && RNA_property_is_set(op->ptr, "filepath")) {
			char name[FILE_MAX];
			RNA_string_get(op->ptr, "filepath", name);
			if (params->type == FILE_LOADLIB) {
				BLI_strncpy(params->dir, name, sizeof(params->dir));
				sfile->params->file[0]= '\0';
			}
			else {
				BLI_split_dirfile(name, sfile->params->dir, sfile->params->file);
			}
		}
		else {
			if (is_directory && RNA_property_is_set(op->ptr, "directory")) {
				RNA_string_get(op->ptr, "directory", params->dir);
				sfile->params->file[0]= '\0';
			}

			if (is_filename && RNA_property_is_set(op->ptr, "filename")) {
				RNA_string_get(op->ptr, "filename", params->file);
			}
		}

		if(params->dir[0]) {
			BLI_cleanup_dir(G.main->name, params->dir);
			BLI_path_abs(params->dir, G.main->name);
		}

		if(is_directory==TRUE && is_filename==FALSE && is_filepath==FALSE && is_files==FALSE) {
			params->flag |= FILE_DIRSEL_ONLY;
		}
		else {
			params->flag &= ~FILE_DIRSEL_ONLY;
		}

		params->filter = 0;
		if(RNA_struct_find_property(op->ptr, "filter_blender"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_blender") ? BLENDERFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_image"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_image") ? IMAGEFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_movie"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_movie") ? MOVIEFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_text"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_text") ? TEXTFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_python"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_python") ? PYSCRIPTFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_font"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_font") ? FTFONTFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_sound"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_sound") ? SOUNDFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_text"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_text") ? TEXTFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_folder"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_folder") ? FOLDERFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_btx"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_btx") ? BTXFILE : 0;
		if(RNA_struct_find_property(op->ptr, "filter_collada"))
			params->filter |= RNA_boolean_get(op->ptr, "filter_collada") ? COLLADAFILE : 0;
		if (RNA_struct_find_property(op->ptr, "filter_glob")) {
			RNA_string_get(op->ptr, "filter_glob", params->filter_glob);
			params->filter |= (OPERATORFILE|FOLDERFILE);
		}
		else {
			params->filter_glob[0] = '\0';
		}

		if (params->filter != 0) {
			if (U.uiflag & USER_FILTERFILEEXTS) {
				params->flag |= FILE_FILTER;
			} else {
				params->flag &= ~FILE_FILTER;
			}
		}

		if (U.uiflag & USER_HIDE_DOT) {
			params->flag |= FILE_HIDE_DOT;
		} else {
			params->flag &= ~FILE_HIDE_DOT;
		}
		

		if (params->type == FILE_LOADLIB) {
			params->flag |= RNA_boolean_get(op->ptr, "link") ? FILE_LINK : 0;
			params->flag |= RNA_boolean_get(op->ptr, "autoselect") ? FILE_AUTOSELECT : 0;
			params->flag |= RNA_boolean_get(op->ptr, "active_layer") ? FILE_ACTIVELAY : 0;
		}
		
		if (U.uiflag & USER_SHOW_THUMBNAILS) {
			if(params->filter & (IMAGEFILE|MOVIEFILE))
				params->display= FILE_IMGDISPLAY;
			else
				params->display= FILE_SHORTDISPLAY;
		} else {
			params->display= FILE_SHORTDISPLAY;
		}

	}
	else {
		/* default values, if no operator */
		params->type = FILE_UNIX;
		params->flag |= FILE_HIDE_DOT;
		params->flag &= ~FILE_DIRSEL_ONLY;
		params->display = FILE_SHORTDISPLAY;
		params->filter = 0;
		params->filter_glob[0] = '\0';
		params->sort = FILE_SORT_ALPHA;
	}


	/* initialize the list with previous folders */
	if (!sfile->folders_prev)
		sfile->folders_prev = folderlist_new();
	folderlist_pushdir(sfile->folders_prev, sfile->params->dir);

	return 1;
}

void ED_fileselect_reset_params(SpaceFile *sfile)
{
	sfile->params->type = FILE_UNIX;
	sfile->params->flag = 0;
	sfile->params->title[0] = '\0';
}

int ED_fileselect_layout_numfiles(FileLayout* layout, struct ARegion *ar)
{
	int numfiles;

	if (layout->flag & FILE_LAYOUT_HOR) {
		int width = (int)(ar->v2d.cur.xmax - ar->v2d.cur.xmin - 2*layout->tile_border_x);
		numfiles = (int)((float)width / (float)layout->tile_w + 0.5f);
		return numfiles*layout->rows;
	} else {
		int height = (int)(ar->v2d.cur.ymax - ar->v2d.cur.ymin - 2*layout->tile_border_y);
		numfiles = (int)((float)height/(float)layout->tile_h + 0.5f);
		return numfiles*layout->columns;
	}
}

static int is_inside(int x, int y, int cols, int rows)
{
	return ( (x >= 0) && (x<cols) && (y>=0) && (y<rows) );
}

FileSelection ED_fileselect_layout_offset_rect(FileLayout* layout, const rcti* rect)
{
	int colmin, colmax, rowmin, rowmax;
	FileSelection sel;
	sel.first = sel.last = -1;

	if (layout == NULL)
		return sel;
	
	colmin = (rect->xmin)/(layout->tile_w + 2*layout->tile_border_x);
	rowmin = (rect->ymin)/(layout->tile_h + 2*layout->tile_border_y);
	colmax = (rect->xmax)/(layout->tile_w + 2*layout->tile_border_x);
	rowmax = (rect->ymax)/(layout->tile_h + 2*layout->tile_border_y);
	
	if ( is_inside(colmin, rowmin, layout->columns, layout->rows) || 
		 is_inside(colmax, rowmax, layout->columns, layout->rows) ) {
		CLAMP(colmin, 0, layout->columns-1);
		CLAMP(rowmin, 0, layout->rows-1);
		CLAMP(colmax, 0, layout->columns-1);
		CLAMP(rowmax, 0, layout->rows-1);
	} 
	
	if  ( (colmin > layout->columns-1) || (rowmin > layout->rows-1) ) {
		sel.first = -1;
	} else {
		if (layout->flag & FILE_LAYOUT_HOR) 
			sel.first = layout->rows*colmin + rowmin;
		else
			sel.first = colmin + layout->columns*rowmin;
	}
	if  ( (colmax > layout->columns-1) || (rowmax > layout->rows-1) ) {
		sel.last = -1;
	} else {
		if (layout->flag & FILE_LAYOUT_HOR) 
			sel.last = layout->rows*colmax + rowmax;
		else
			sel.last = colmax + layout->columns*rowmax;
	}

	return sel;
}

int ED_fileselect_layout_offset(FileLayout* layout, int x, int y)
{
	int offsetx, offsety;
	int active_file;

	if (layout == NULL)
		return -1;
	
	offsetx = (x)/(layout->tile_w + 2*layout->tile_border_x);
	offsety = (y)/(layout->tile_h + 2*layout->tile_border_y);
	
	if (offsetx > layout->columns-1) return -1 ;
	if (offsety > layout->rows-1) return -1 ;
	
	if (layout->flag & FILE_LAYOUT_HOR) 
		active_file = layout->rows*offsetx + offsety;
	else
		active_file = offsetx + layout->columns*offsety;
	return active_file;
}

void ED_fileselect_layout_tilepos(FileLayout* layout, int tile, int *x, int *y)
{
	if (layout->flag == FILE_LAYOUT_HOR) {
		*x = layout->tile_border_x + (tile/layout->rows)*(layout->tile_w+2*layout->tile_border_x);
		*y = layout->tile_border_y + (tile%layout->rows)*(layout->tile_h+2*layout->tile_border_y);
	} else {
		*x = layout->tile_border_x + ((tile)%layout->columns)*(layout->tile_w+2*layout->tile_border_x);
		*y = layout->tile_border_y + ((tile)/layout->columns)*(layout->tile_h+2*layout->tile_border_y);
	}
}

/* Shorten a string to a given width w. 
   If front is set, shorten from the front,
   otherwise shorten from the end. */
float file_shorten_string(char* string, float w, int front)
{	
	char temp[FILE_MAX];
	short shortened = 0;
	float sw = 0;
	float pad = 0;

	if (w <= 0) {
		*string = '\0';
		return 0.0;
	}

	sw = file_string_width(string);
	if (front == 1) {
		char *s = string;
		BLI_strncpy(temp, "...", 4);
		pad = file_string_width(temp);
		while ((*s) && (sw+pad>w)) {
			s++;
			sw = file_string_width(s);
			shortened = 1;
		}
		if (shortened) {
			int slen = strlen(s);			
			BLI_strncpy(temp+3, s, slen+1);
			temp[slen+4] = '\0';
			BLI_strncpy(string, temp, slen+4);
		}
	} else {
		char *s = string;
		while (sw>w) {
			int slen = strlen(string);
			string[slen-1] = '\0';
			sw = file_string_width(s);
			shortened = 1;
		}

		if (shortened) {
			int slen = strlen(string);
			if (slen > 3) {
				BLI_strncpy(string+slen-3, "...", 4);				
			}
		}
	}
	
	return sw;
}

float file_string_width(const char* str)
{
	uiStyle *style= U.uistyles.first;
	uiStyleFontSet(&style->widget);
	return BLF_width(style->widget.uifont_id, str);
}

float file_font_pointsize(void)
{
#if 0
	float s;
	char tmp[2] = "X";
	uiStyle *style= U.uistyles.first;
	uiStyleFontSet(&style->widget);
	s = BLF_height(style->widget.uifont_id, tmp);
	return style->widget.points;
#else
	uiStyle *style= U.uistyles.first;
	uiStyleFontSet(&style->widget);
	return style->widget.points * UI_DPI_FAC;
#endif
}

static void column_widths(struct FileList* files, struct FileLayout* layout)
{
	int i;
	int numfiles = filelist_numfiles(files);

	for (i=0; i<MAX_FILE_COLUMN; ++i) {
		layout->column_widths[i] = 0;
	}

	for (i=0; (i < numfiles); ++i)
	{
		struct direntry* file = filelist_file(files, i);	
		if (file) {
			float len;
			len = file_string_width(file->relname);
			if (len > layout->column_widths[COLUMN_NAME]) layout->column_widths[COLUMN_NAME] = len;
			len = file_string_width(file->date);
			if (len > layout->column_widths[COLUMN_DATE]) layout->column_widths[COLUMN_DATE] = len;
			len = file_string_width(file->time);
			if (len > layout->column_widths[COLUMN_TIME]) layout->column_widths[COLUMN_TIME] = len;
			len = file_string_width(file->size);
			if (len > layout->column_widths[COLUMN_SIZE]) layout->column_widths[COLUMN_SIZE] = len;
			len = file_string_width(file->mode1);
			if (len > layout->column_widths[COLUMN_MODE1]) layout->column_widths[COLUMN_MODE1] = len;
			len = file_string_width(file->mode2);
			if (len > layout->column_widths[COLUMN_MODE2]) layout->column_widths[COLUMN_MODE2] = len;
			len = file_string_width(file->mode3);
			if (len > layout->column_widths[COLUMN_MODE3]) layout->column_widths[COLUMN_MODE3] = len;
			len = file_string_width(file->owner);
			if (len > layout->column_widths[COLUMN_OWNER]) layout->column_widths[COLUMN_OWNER] = len;
		}
	}
}

void ED_fileselect_init_layout(struct SpaceFile *sfile, struct ARegion *ar)
{
	FileSelectParams *params = ED_fileselect_get_params(sfile);
	FileLayout *layout= NULL;
	View2D *v2d= &ar->v2d;
	int maxlen = 0;
	int numfiles;
	int textheight;
	if (sfile->layout == NULL) {
		sfile->layout = MEM_callocN(sizeof(struct FileLayout), "file_layout");
		sfile->layout->dirty = 1;
	} 

	if (!sfile->layout->dirty) return;

	numfiles = filelist_numfiles(sfile->files);
	textheight = (int)file_font_pointsize();
	layout = sfile->layout;
	layout->textheight = textheight;

	if (params->display == FILE_IMGDISPLAY) {
		layout->prv_w = 96;
		layout->prv_h = 96;
		layout->tile_border_x = 6;
		layout->tile_border_y = 6;
		layout->prv_border_x = 6;
		layout->prv_border_y = 6;
		layout->tile_w = layout->prv_w + 2*layout->prv_border_x;
		layout->tile_h = layout->prv_h + 2*layout->prv_border_y + textheight;
		layout->width= (int)(v2d->cur.xmax - v2d->cur.xmin - 2*layout->tile_border_x);
		layout->columns= layout->width / (layout->tile_w + 2*layout->tile_border_x);
		if(layout->columns > 0)
			layout->rows= numfiles/layout->columns + 1; // XXX dirty, modulo is zero
		else {
			layout->columns = 1;
			layout->rows= numfiles + 1; // XXX dirty, modulo is zero
		}
		layout->height= sfile->layout->rows*(layout->tile_h+2*layout->tile_border_y) + layout->tile_border_y*2;
		layout->flag = FILE_LAYOUT_VER;
	} else {
		layout->prv_w = 0;
		layout->prv_h = 0;
		layout->tile_border_x = 8;
		layout->tile_border_y = 2;
		layout->prv_border_x = 0;
		layout->prv_border_y = 0;
		layout->tile_h = textheight*3/2;
		layout->height= (int)(v2d->cur.ymax - v2d->cur.ymin - 2*layout->tile_border_y);
		layout->rows = layout->height / (layout->tile_h + 2*layout->tile_border_y);

		column_widths(sfile->files, layout);

		if (params->display == FILE_SHORTDISPLAY) {
			maxlen = ICON_DEFAULT_WIDTH_SCALE + 4 +
					 (int)layout->column_widths[COLUMN_NAME] + 12 +
					 (int)layout->column_widths[COLUMN_SIZE] + 12;
		} else {
			maxlen = ICON_DEFAULT_WIDTH_SCALE + 4 +
					 (int)layout->column_widths[COLUMN_NAME] + 12 +
#ifndef WIN32
					 (int)layout->column_widths[COLUMN_MODE1] + 12 +
					 (int)layout->column_widths[COLUMN_MODE2] + 12 +
					 (int)layout->column_widths[COLUMN_MODE3] + 12 +
					 (int)layout->column_widths[COLUMN_OWNER] + 12 +
#endif
					 (int)layout->column_widths[COLUMN_DATE] + 12 +
					 (int)layout->column_widths[COLUMN_TIME] + 12 +
					 (int)layout->column_widths[COLUMN_SIZE] + 12;

		}
		layout->tile_w = maxlen;
		if(layout->rows > 0)
			layout->columns = numfiles/layout->rows + 1; // XXX dirty, modulo is zero
		else {
			layout->rows = 1;
			layout->columns = numfiles + 1; // XXX dirty, modulo is zero
		}
		layout->width = sfile->layout->columns * (layout->tile_w + 2*layout->tile_border_x) + layout->tile_border_x*2;
		layout->flag = FILE_LAYOUT_HOR;
	}
	layout->dirty= 0;
}

FileLayout* ED_fileselect_get_layout(struct SpaceFile *sfile, struct ARegion *ar)
{
	if (!sfile->layout) {
		ED_fileselect_init_layout(sfile, ar);
	}
	return sfile->layout;
}

void file_change_dir(bContext *C, int checkdir)
{
	SpaceFile *sfile= CTX_wm_space_file(C);

	if (sfile->params) {

		ED_fileselect_clear(C, sfile);

		if(checkdir && BLI_is_dir(sfile->params->dir)==0) {
			BLI_strncpy(sfile->params->dir, filelist_dir(sfile->files), sizeof(sfile->params->dir));
			/* could return but just refresh the current dir */
		}
		filelist_setdir(sfile->files, sfile->params->dir);
		
		if(folderlist_clear_next(sfile))
			folderlist_free(sfile->folders_next);

		folderlist_pushdir(sfile->folders_prev, sfile->params->dir);

	}
}

int file_select_match(struct SpaceFile *sfile, const char *pattern)
{
	int match = 0;
	if (strchr(pattern, '*') || strchr(pattern, '?') || strchr(pattern, '[')) {
		int i;
		struct direntry *file;
		int n = filelist_numfiles(sfile->files);

		for (i = 0; i < n; i++) {
			file = filelist_file(sfile->files, i);
			if (fnmatch(pattern, file->relname, 0) == 0) {
				file->selflag |= SELECTED_FILE;
				match = 1;
			}
		}
	}
	return match;
}

void autocomplete_directory(struct bContext *C, char *str, void *UNUSED(arg_v))
{
	SpaceFile *sfile= CTX_wm_space_file(C);

	/* search if str matches the beginning of name */
	if(str[0] && sfile->files) {
		char dirname[FILE_MAX];

		DIR *dir;
		struct dirent *de;
		
		BLI_split_dirfile(str, dirname, NULL);

		dir = opendir(dirname);

		if(dir) {
			AutoComplete *autocpl= autocomplete_begin(str, FILE_MAX);

			while ((de = readdir(dir)) != NULL) {
				if (strcmp(".", de->d_name)==0 || strcmp("..", de->d_name)==0) {
					/* pass */
				}
				else {
					char path[FILE_MAX];
					struct stat status;
					
					BLI_join_dirfile(path, sizeof(path), dirname, de->d_name);

					if (stat(path, &status) == 0) {
						if (S_ISDIR(status.st_mode)) { /* is subdir */
							autocomplete_do_name(autocpl, path);
						}
					}
				}
			}
			closedir(dir);

			autocomplete_end(autocpl, str);
			if (BLI_exists(str)) {
				BLI_add_slash(str);
			} else {
				BLI_strncpy(sfile->params->dir, str, sizeof(sfile->params->dir));
			}
		}
	}
}

void autocomplete_file(struct bContext *C, char *str, void *UNUSED(arg_v))
{
	SpaceFile *sfile= CTX_wm_space_file(C);

	/* search if str matches the beginning of name */
	if(str[0] && sfile->files) {
		AutoComplete *autocpl= autocomplete_begin(str, FILE_MAX);
		int nentries = filelist_numfiles(sfile->files);
		int i;

		for(i= 0; i<nentries; ++i) {
			struct direntry* file = filelist_file(sfile->files, i);
			if (file && S_ISREG(file->type)) {
				autocomplete_do_name(autocpl, file->relname);
			}
		}
		autocomplete_end(autocpl, str);
	}
}

void ED_fileselect_clear(struct bContext *C, struct SpaceFile *sfile)
{
	thumbnails_stop(sfile->files, C);
	filelist_freelib(sfile->files);
	filelist_free(sfile->files);
	sfile->params->active_file = -1;
	WM_event_add_notifier(C, NC_SPACE|ND_SPACE_FILE_LIST, NULL);
}

void ED_fileselect_exit(struct bContext *C, struct SpaceFile *sfile)
{
	if(!sfile) return;
	if(sfile->op) {
		WM_event_fileselect_event(C, sfile->op, EVT_FILESELECT_EXTERNAL_CANCEL);
		sfile->op = NULL;
	}

	folderlist_free(sfile->folders_prev);
	folderlist_free(sfile->folders_next);
	
	if (sfile->files) {
		ED_fileselect_clear(C, sfile);
		MEM_freeN(sfile->files);
		sfile->files= NULL;
	}

}
