/*
 * ***** 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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): Blender Foundation 2007
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/windowmanager/intern/wm_files.c
 *  \ingroup wm
 *
 * User level access for blend file read/write, file-history and userprefs.
 */


/* placed up here because of crappy
 * winsock stuff.
 */
#include <stddef.h>
#include <string.h>
#include <errno.h>

#include "zlib.h" /* wm_read_exotic() */

#ifdef WIN32
#  include <windows.h> /* need to include windows.h so _WIN32_IE is defined  */
#  ifndef _WIN32_IE
#    define _WIN32_IE 0x0400 /* minimal requirements for SHGetSpecialFolderPath on MINGW MSVC has this defined already */
#  endif
#  include <shlobj.h>  /* for SHGetSpecialFolderPath, has to be done before BLI_winstuff
                        * because 'near' is disabled through BLI_windstuff */
#  include "BLI_winstuff.h"
#endif

#include "MEM_guardedalloc.h"
#include "MEM_CacheLimiterC-Api.h"

#include "BLI_blenlib.h"
#include "BLI_linklist.h"
#include "BLI_utildefines.h"
#include "BLI_threads.h"
#include "BLI_callbacks.h"
#include "BLI_system.h"
#include BLI_SYSTEM_PID_H

#include "BLF_translation.h"

#include "DNA_object_types.h"
#include "DNA_space_types.h"
#include "DNA_userdef_types.h"
#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_windowmanager_types.h"

#include "BKE_utildefines.h"
#include "BKE_autoexec.h"
#include "BKE_blender.h"
#include "BKE_context.h"
#include "BKE_depsgraph.h"
#include "BKE_global.h"
#include "BKE_main.h"
#include "BKE_packedFile.h"
#include "BKE_report.h"
#include "BKE_sound.h"
#include "BKE_screen.h"

#include "BLO_readfile.h"
#include "BLO_writefile.h"

#include "RNA_access.h"

#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"
#include "IMB_thumbs.h"

#include "ED_datafiles.h"
#include "ED_fileselect.h"
#include "ED_screen.h"
#include "ED_view3d.h"
#include "ED_util.h"

#include "RE_pipeline.h" /* only to report missing engine */

#include "GHOST_C-api.h"
#include "GHOST_Path-api.h"

#include "UI_interface.h"
#include "UI_view2d.h"

#include "GPU_draw.h"

#ifdef WITH_PYTHON
#include "BPY_extern.h"
#endif

#include "WM_api.h"
#include "WM_types.h"
#include "wm.h"
#include "wm_files.h"
#include "wm_window.h"
#include "wm_event_system.h"

static void write_history(void);

/* To be able to read files without windows closing, opening, moving
 * we try to prepare for worst case:
 * - active window gets active screen from file
 * - restoring the screens from non-active windows
 * Best case is all screens match, in that case they get assigned to proper window
 */
static void wm_window_match_init(bContext *C, ListBase *wmlist)
{
	wmWindowManager *wm;
	wmWindow *win, *active_win;
	
	*wmlist = G.main->wm;
	BLI_listbase_clear(&G.main->wm);
	
	active_win = CTX_wm_window(C);

	/* first wrap up running stuff */
	/* code copied from wm_init_exit.c */
	for (wm = wmlist->first; wm; wm = wm->id.next) {
		
		WM_jobs_kill_all(wm);
		
		for (win = wm->windows.first; win; win = win->next) {
		
			CTX_wm_window_set(C, win);  /* needed by operator close callbacks */
			WM_event_remove_handlers(C, &win->handlers);
			WM_event_remove_handlers(C, &win->modalhandlers);
			ED_screen_exit(C, win, win->screen);
		}
	}
	
	/* reset active window */
	CTX_wm_window_set(C, active_win);

	ED_editors_exit(C);

	/* just had return; here from r12991, this code could just get removed?*/
#if 0
	if (wm == NULL) return;
	if (G.fileflags & G_FILE_NO_UI) return;
	
	/* we take apart the used screens from non-active window */
	for (win = wm->windows.first; win; win = win->next) {
		BLI_strncpy(win->screenname, win->screen->id.name, MAX_ID_NAME);
		if (win != wm->winactive) {
			BLI_remlink(&G.main->screen, win->screen);
			//BLI_addtail(screenbase, win->screen);
		}
	}
#endif
}

static void wm_window_substitute_old(wmWindowManager *wm, wmWindow *oldwin, wmWindow *win)
{
	win->ghostwin = oldwin->ghostwin;
	win->active = oldwin->active;
	if (win->active)
		wm->winactive = win;

	if (!G.background) /* file loading in background mode still calls this */
		GHOST_SetWindowUserData(win->ghostwin, win);    /* pointer back */

	oldwin->ghostwin = NULL;

	win->eventstate = oldwin->eventstate;
	oldwin->eventstate = NULL;

	/* ensure proper screen rescaling */
	win->sizex = oldwin->sizex;
	win->sizey = oldwin->sizey;
	win->posx = oldwin->posx;
	win->posy = oldwin->posy;
}

/* match old WM with new, 4 cases:
 * 1- no current wm, no read wm: make new default
 * 2- no current wm, but read wm: that's OK, do nothing
 * 3- current wm, but not in file: try match screen names
 * 4- current wm, and wm in file: try match ghostwin
 */

static void wm_window_match_do(bContext *C, ListBase *oldwmlist)
{
	wmWindowManager *oldwm, *wm;
	wmWindow *oldwin, *win;
	
	/* cases 1 and 2 */
	if (BLI_listbase_is_empty(oldwmlist)) {
		if (G.main->wm.first) {
			/* nothing todo */
		}
		else {
			wm_add_default(C);
		}
	}
	else {
		/* cases 3 and 4 */
		
		/* we've read file without wm..., keep current one entirely alive */
		if (BLI_listbase_is_empty(&G.main->wm)) {
			bScreen *screen = NULL;

			/* when loading without UI, no matching needed */
			if (!(G.fileflags & G_FILE_NO_UI) && (screen = CTX_wm_screen(C))) {

				/* match oldwm to new dbase, only old files */
				for (wm = oldwmlist->first; wm; wm = wm->id.next) {
					
					for (win = wm->windows.first; win; win = win->next) {
						/* all windows get active screen from file */
						if (screen->winid == 0)
							win->screen = screen;
						else 
							win->screen = ED_screen_duplicate(win, screen);
						
						BLI_strncpy(win->screenname, win->screen->id.name + 2, sizeof(win->screenname));
						win->screen->winid = win->winid;
					}
				}
			}
			
			G.main->wm = *oldwmlist;
			
			/* screens were read from file! */
			ED_screens_initialize(G.main->wm.first);
		}
		else {
			bool has_match = false;

			/* what if old was 3, and loaded 1? */
			/* this code could move to setup_appdata */
			oldwm = oldwmlist->first;
			wm = G.main->wm.first;

			/* preserve key configurations in new wm, to preserve their keymaps */
			wm->keyconfigs = oldwm->keyconfigs;
			wm->addonconf = oldwm->addonconf;
			wm->defaultconf = oldwm->defaultconf;
			wm->userconf = oldwm->userconf;

			BLI_listbase_clear(&oldwm->keyconfigs);
			oldwm->addonconf = NULL;
			oldwm->defaultconf = NULL;
			oldwm->userconf = NULL;

			/* ensure making new keymaps and set space types */
			wm->initialized = 0;
			wm->winactive = NULL;

			/* only first wm in list has ghostwins */
			for (win = wm->windows.first; win; win = win->next) {
				for (oldwin = oldwm->windows.first; oldwin; oldwin = oldwin->next) {

					if (oldwin->winid == win->winid) {
						has_match = true;

						wm_window_substitute_old(wm, oldwin, win);
					}
				}
			}

			/* make sure at least one window is kept open so we don't lose the context, check T42303 */
			if (!has_match) {
				oldwin = oldwm->windows.first;
				win = wm->windows.first;

				wm_window_substitute_old(wm, oldwin, win);
			}

			wm_close_and_free_all(C, oldwmlist);
		}
	}
}

/* in case UserDef was read, we re-initialize all, and do versioning */
static void wm_init_userdef(bContext *C, const bool from_memory)
{
	Main *bmain = CTX_data_main(C);

	/* versioning is here */
	UI_init_userdef();
	
	MEM_CacheLimiter_set_maximum(((size_t)U.memcachelimit) * 1024 * 1024);
	sound_init(bmain);

	/* needed so loading a file from the command line respects user-pref [#26156] */
	BKE_BIT_TEST_SET(G.fileflags, U.flag & USER_FILENOUI, G_FILE_NO_UI);

	/* set the python auto-execute setting from user prefs */
	/* enabled by default, unless explicitly enabled in the command line which overrides */
	if ((G.f & G_SCRIPT_OVERRIDE_PREF) == 0) {
		BKE_BIT_TEST_SET(G.f, (U.flag & USER_SCRIPT_AUTOEXEC_DISABLE) == 0, G_SCRIPT_AUTOEXEC);
	}

	/* avoid re-saving for every small change to our prefs, allow overrides */
	if (from_memory) {
		BLO_update_defaults_userpref_blend();
	}

	/* update tempdir from user preferences */
	BLI_temp_dir_init(U.tempdir);

	BKE_userdef_state();
}



/* return codes */
#define BKE_READ_EXOTIC_FAIL_PATH       -3 /* file format is not supported */
#define BKE_READ_EXOTIC_FAIL_FORMAT     -2 /* file format is not supported */
#define BKE_READ_EXOTIC_FAIL_OPEN       -1 /* Can't open the file */
#define BKE_READ_EXOTIC_OK_BLEND         0 /* .blend file */
#define BKE_READ_EXOTIC_OK_OTHER         1 /* other supported formats */


/* intended to check for non-blender formats but for now it only reads blends */
static int wm_read_exotic(Scene *UNUSED(scene), const char *name)
{
	int len;
	gzFile gzfile;
	char header[7];
	int retval;

	/* make sure we're not trying to read a directory.... */

	len = strlen(name);
	if (len > 0 && ELEM(name[len - 1], '/', '\\')) {
		retval = BKE_READ_EXOTIC_FAIL_PATH;
	}
	else {
		gzfile = BLI_gzopen(name, "rb");
		if (gzfile == NULL) {
			retval = BKE_READ_EXOTIC_FAIL_OPEN;
		}
		else {
			len = gzread(gzfile, header, sizeof(header));
			gzclose(gzfile);
			if (len == sizeof(header) && strncmp(header, "BLENDER", 7) == 0) {
				retval = BKE_READ_EXOTIC_OK_BLEND;
			}
			else {
#if 0           /* historic stuff - no longer used */
				WM_cursor_wait(true);

				if (is_foo_format(name)) {
					read_foo(name);
					retval = BKE_READ_EXOTIC_OK_OTHER;
				}
				else
#endif
				{
					retval = BKE_READ_EXOTIC_FAIL_FORMAT;
				}
#if 0
				WM_cursor_wait(false);
#endif
			}
		}
	}

	return retval;
}

void WM_file_autoexec_init(const char *filepath)
{
	if (G.f & G_SCRIPT_OVERRIDE_PREF) {
		return;
	}

	if (G.f & G_SCRIPT_AUTOEXEC) {
		char path[FILE_MAX];
		BLI_split_dir_part(filepath, path, sizeof(path));
		if (BKE_autoexec_match(path)) {
			G.f &= ~G_SCRIPT_AUTOEXEC;
		}
	}
}

bool WM_file_read(bContext *C, const char *filepath, ReportList *reports)
{
	bool success = false;
	int retval;

	/* so we can get the error message */
	errno = 0;

	WM_cursor_wait(1);

	BLI_callback_exec(CTX_data_main(C), NULL, BLI_CB_EVT_LOAD_PRE);

	UI_view2d_zoom_cache_reset();

	/* first try to append data from exotic file formats... */
	/* it throws error box when file doesn't exist and returns -1 */
	/* note; it should set some error message somewhere... (ton) */
	retval = wm_read_exotic(CTX_data_scene(C), filepath);
	
	/* we didn't succeed, now try to read Blender file */
	if (retval == BKE_READ_EXOTIC_OK_BLEND) {
		int G_f = G.f;
		ListBase wmbase;

		/* assume automated tasks with background, don't write recent file list */
		const bool do_history = (G.background == false) && (CTX_wm_manager(C)->op_undo_depth == 0);

		/* put aside screens to match with persistent windows later */
		/* also exit screens and editors */
		wm_window_match_init(C, &wmbase); 
		
		/* confusing this global... */
		G.relbase_valid = 1;
		retval = BKE_read_file(C, filepath, reports);
		/* when loading startup.blend's, we can be left with a blank path */
		if (G.main->name[0]) {
			G.save_over = 1;
		}
		else {
			G.save_over = 0;
			G.relbase_valid = 0;
		}

		/* this flag is initialized by the operator but overwritten on read.
		 * need to re-enable it here else drivers + registered scripts wont work. */
		if (G.f != G_f) {
			const int flags_keep = (G_SCRIPT_AUTOEXEC | G_SCRIPT_OVERRIDE_PREF);
			G.f = (G.f & ~flags_keep) | (G_f & flags_keep);
		}

		/* match the read WM with current WM */
		wm_window_match_do(C, &wmbase);
		WM_check(C); /* opens window(s), checks keymaps */

		if (retval == BKE_READ_FILE_OK_USERPREFS) {
			/* in case a userdef is read from regular .blend */
			wm_init_userdef(C, false);
		}
		
		if (retval != BKE_READ_FILE_FAIL) {
			if (do_history) {
				write_history();
			}
		}


		WM_event_add_notifier(C, NC_WM | ND_FILEREAD, NULL);
//		refresh_interface_font();

		CTX_wm_window_set(C, CTX_wm_manager(C)->windows.first);

		ED_editors_init(C);
		DAG_on_visible_update(CTX_data_main(C), true);

#ifdef WITH_PYTHON
		/* run any texts that were loaded in and flagged as modules */
		BPY_python_reset(C);
#endif

		WM_operatortype_last_properties_clear_all();

		/* important to do before NULL'ing the context */
		BLI_callback_exec(CTX_data_main(C), NULL, BLI_CB_EVT_VERSION_UPDATE);
		BLI_callback_exec(CTX_data_main(C), NULL, BLI_CB_EVT_LOAD_POST);

		if (!G.background) {
			/* in background mode this makes it hard to load
			 * a blend file and do anything since the screen
			 * won't be set to a valid value again */
			CTX_wm_window_set(C, NULL); /* exits queues */
		}

#if 0
		/* gives popups on windows but not linux, bug in report API
		 * but disable for now to stop users getting annoyed  */
		/* TODO, make this show in header info window */
		{
			Scene *sce;
			for (sce = G.main->scene.first; sce; sce = sce->id.next) {
				if (sce->r.engine[0] &&
				    BLI_findstring(&R_engines, sce->r.engine, offsetof(RenderEngineType, idname)) == NULL)
				{
					BKE_reportf(reports, RPT_ERROR, "Engine '%s' not available for scene '%s' "
					            "(an addon may need to be installed or enabled)",
					            sce->r.engine, sce->id.name + 2);
				}
			}
		}
#endif

		BKE_reset_undo();
		BKE_write_undo(C, "original");  /* save current state */

		success = true;
	}
	else if (retval == BKE_READ_EXOTIC_OK_OTHER)
		BKE_write_undo(C, "Import file");
	else if (retval == BKE_READ_EXOTIC_FAIL_OPEN) {
		BKE_reportf(reports, RPT_ERROR, "Cannot read file '%s': %s", filepath,
		            errno ? strerror(errno) : TIP_("unable to open the file"));
	}
	else if (retval == BKE_READ_EXOTIC_FAIL_FORMAT) {
		BKE_reportf(reports, RPT_ERROR, "File format is not supported in file '%s'", filepath);
	}
	else if (retval == BKE_READ_EXOTIC_FAIL_PATH) {
		BKE_reportf(reports, RPT_ERROR, "File path '%s' invalid", filepath);
	}
	else {
		BKE_reportf(reports, RPT_ERROR, "Unknown error loading '%s'", filepath);
		BLI_assert(!"invalid 'retval'");
	}

	WM_cursor_wait(0);

	return success;

}


/* called on startup,  (context entirely filled with NULLs) */
/* or called for 'New File' */
/* both startup.blend and userpref.blend are checked */
/* the optional paramater custom_file points to an alterntive startup page */
/* custom_file can be NULL */
int wm_homefile_read(bContext *C, ReportList *reports, bool from_memory, const char *custom_file)
{
	ListBase wmbase;
	char startstr[FILE_MAX];
	char prefstr[FILE_MAX];
	int success = 0;

	/* Indicates whether user preferences were really load from memory.
	 *
	 * This is used for versioning code, and for this we can not rely on from_memory
	 * passed via argument. This is because there might be configuration folder
	 * exists but it might not have userpref.blend and in this case we fallback to
	 * reading home file from memory.
	 *
	 * And in this case versioning code is to be run.
	 */
	bool read_userdef_from_memory = true;

	/* options exclude eachother */
	BLI_assert((from_memory && custom_file) == 0);

	BLI_callback_exec(CTX_data_main(C), NULL, BLI_CB_EVT_LOAD_PRE);

	UI_view2d_zoom_cache_reset();

	G.relbase_valid = 0;
	if (!from_memory) {
		const char * const cfgdir = BLI_get_folder(BLENDER_USER_CONFIG, NULL);
		if (custom_file) {
			BLI_strncpy(startstr, custom_file, FILE_MAX);

			if (cfgdir) {
				BLI_make_file_string(G.main->name, prefstr, cfgdir, BLENDER_USERPREF_FILE);
			}
			else {
				prefstr[0] = '\0';
			}
		}
		else if (cfgdir) {
			BLI_make_file_string(G.main->name, startstr, cfgdir, BLENDER_STARTUP_FILE);
			BLI_make_file_string(G.main->name, prefstr, cfgdir, BLENDER_USERPREF_FILE);
		}
		else {
			startstr[0] = '\0';
			prefstr[0] = '\0';
			from_memory = 1;
		}
	}
	
	/* put aside screens to match with persistent windows later */
	wm_window_match_init(C, &wmbase);
	
	if (!from_memory) {
		if (BLI_access(startstr, R_OK) == 0) {
			success = (BKE_read_file(C, startstr, NULL) != BKE_READ_FILE_FAIL);
		}
		if (BLI_listbase_is_empty(&U.themes)) {
			if (G.debug & G_DEBUG)
				printf("\nNote: No (valid) '%s' found, fall back to built-in default.\n\n", startstr);
			success = 0;
		}
	}

	if (success == 0 && custom_file && reports) {
		BKE_reportf(reports, RPT_ERROR, "Could not read '%s'", custom_file);
		/*We can not return from here because wm is already reset*/
	}

	if (success == 0) {
		success = BKE_read_file_from_memory(C, datatoc_startup_blend, datatoc_startup_blend_size, NULL, true);
		if (BLI_listbase_is_empty(&wmbase)) {
			wm_clear_default_size(C);
		}
		BLI_temp_dir_init(U.tempdir);

#ifdef WITH_PYTHON_SECURITY
		/* use alternative setting for security nuts
		 * otherwise we'd need to patch the binary blob - startup.blend.c */
		U.flag |= USER_SCRIPT_AUTOEXEC_DISABLE;
#endif
	}
	
	/* check new prefs only after startup.blend was finished */
	if (!from_memory && BLI_exists(prefstr)) {
		int done = BKE_read_file_userdef(prefstr, NULL);
		if (done != BKE_READ_FILE_FAIL) {
			read_userdef_from_memory = false;
			printf("Read new prefs: %s\n", prefstr);
		}
	}
	
	/* prevent buggy files that had G_FILE_RELATIVE_REMAP written out by mistake. Screws up autosaves otherwise
	 * can remove this eventually, only in a 2.53 and older, now its not written */
	G.fileflags &= ~G_FILE_RELATIVE_REMAP;
	
	/* check userdef before open window, keymaps etc */
	wm_init_userdef(C, read_userdef_from_memory);
	
	/* match the read WM with current WM */
	wm_window_match_do(C, &wmbase); 
	WM_check(C); /* opens window(s), checks keymaps */

	G.main->name[0] = '\0';

	/* When loading factory settings, the reset solid OpenGL lights need to be applied. */
	if (!G.background) GPU_default_lights();
	
	/* XXX */
	G.save_over = 0;    // start with save preference untitled.blend
	G.fileflags &= ~G_FILE_AUTOPLAY;    /*  disable autoplay in startup.blend... */

//	refresh_interface_font();
	
//	undo_editmode_clear();
	BKE_reset_undo();
	BKE_write_undo(C, "original");  /* save current state */

	ED_editors_init(C);
	DAG_on_visible_update(CTX_data_main(C), true);

#ifdef WITH_PYTHON
	if (CTX_py_init_get(C)) {
		/* sync addons, these may have changed from the defaults */
		BPY_string_exec(C, "__import__('addon_utils').reset_all()");

		BPY_python_reset(C);
	}
#endif

	WM_operatortype_last_properties_clear_all();

	/* important to do before NULL'ing the context */
	BLI_callback_exec(CTX_data_main(C), NULL, BLI_CB_EVT_VERSION_UPDATE);
	BLI_callback_exec(CTX_data_main(C), NULL, BLI_CB_EVT_LOAD_POST);

	WM_event_add_notifier(C, NC_WM | ND_FILEREAD, NULL);

	/* in background mode the scene will stay NULL */
	if (!G.background) {
		CTX_wm_window_set(C, NULL); /* exits queues */
	}

	return true;
}

int wm_history_read_exec(bContext *UNUSED(C), wmOperator *UNUSED(op))
{
	ED_file_read_bookmarks();
	wm_read_history();
	return OPERATOR_FINISHED;
}

int wm_homefile_read_exec(bContext *C, wmOperator *op)
{
	const bool from_memory = (STREQ(op->type->idname, "WM_OT_read_factory_settings"));
	char filepath_buf[FILE_MAX];
	const char *filepath = NULL;

	if (!from_memory) {
		PropertyRNA *prop = RNA_struct_find_property(op->ptr, "filepath");

		/* This can be used when loading of a start-up file should only change
		 * the scene content but keep the blender UI as it is. */
		wm_open_init_load_ui(op, true);
		BKE_BIT_TEST_SET(G.fileflags, !RNA_boolean_get(op->ptr, "load_ui"), G_FILE_NO_UI);

		if (RNA_property_is_set(op->ptr, prop)) {
			RNA_property_string_get(op->ptr, prop, filepath_buf);
			filepath = filepath_buf;
			if (BLI_access(filepath, R_OK)) {
				BKE_reportf(op->reports, RPT_ERROR, "Can't read alternative start-up file: '%s'", filepath);
				return OPERATOR_CANCELLED;
			}
		}
	}

	return wm_homefile_read(C, op->reports, from_memory, filepath) ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
}

void wm_read_history(void)
{
	char name[FILE_MAX];
	LinkNode *l, *lines;
	struct RecentFile *recent;
	const char *line;
	int num;
	const char * const cfgdir = BLI_get_folder(BLENDER_USER_CONFIG, NULL);

	if (!cfgdir) return;

	BLI_make_file_string("/", name, cfgdir, BLENDER_HISTORY_FILE);

	lines = BLI_file_read_as_lines(name);

	BLI_listbase_clear(&G.recent_files);

	/* read list of recent opened files from recent-files.txt to memory */
	for (l = lines, num = 0; l && (num < U.recent_files); l = l->next) {
		line = l->link;
		if (line[0] && BLI_exists(line)) {
			recent = (RecentFile *)MEM_mallocN(sizeof(RecentFile), "RecentFile");
			BLI_addtail(&(G.recent_files), recent);
			recent->filepath = BLI_strdup(line);
			num++;
		}
	}
	
	BLI_file_free_lines(lines);
}

static void write_history(void)
{
	struct RecentFile *recent, *next_recent;
	char name[FILE_MAX];
	const char *user_config_dir;
	FILE *fp;
	int i;

	/* no write history for recovered startup files */
	if (G.main->name[0] == 0)
		return;
	
	/* will be NULL in background mode */
	user_config_dir = BLI_get_folder_create(BLENDER_USER_CONFIG, NULL);
	if (!user_config_dir)
		return;

	BLI_make_file_string("/", name, user_config_dir, BLENDER_HISTORY_FILE);

	recent = G.recent_files.first;
	/* refresh recent-files.txt of recent opened files, when current file was changed */
	if (!(recent) || (BLI_path_cmp(recent->filepath, G.main->name) != 0)) {
		fp = BLI_fopen(name, "w");
		if (fp) {
			/* add current file to the beginning of list */
			recent = (RecentFile *)MEM_mallocN(sizeof(RecentFile), "RecentFile");
			recent->filepath = BLI_strdup(G.main->name);
			BLI_addhead(&(G.recent_files), recent);
			/* write current file to recent-files.txt */
			fprintf(fp, "%s\n", recent->filepath);
			recent = recent->next;
			i = 1;
			/* write rest of recent opened files to recent-files.txt */
			while ((i < U.recent_files) && (recent)) {
				/* this prevents to have duplicities in list */
				if (BLI_path_cmp(recent->filepath, G.main->name) != 0) {
					fprintf(fp, "%s\n", recent->filepath);
					recent = recent->next;
				}
				else {
					next_recent = recent->next;
					MEM_freeN(recent->filepath);
					BLI_freelinkN(&(G.recent_files), recent);
					recent = next_recent;
				}
				i++;
			}
			fclose(fp);
		}

		/* also update most recent files on System */
		GHOST_addToSystemRecentFiles(G.main->name);
	}
}

/* screen can be NULL */
static ImBuf *blend_file_thumb(Scene *scene, bScreen *screen, int **thumb_pt)
{
	/* will be scaled down, but gives some nice oversampling */
	ImBuf *ibuf;
	int *thumb;
	char err_out[256] = "unknown";

	/* screen if no camera found */
	ScrArea *sa = NULL;
	ARegion *ar = NULL;
	View3D *v3d = NULL;

	*thumb_pt = NULL;

	/* scene can be NULL if running a script at startup and calling the save operator */
	if (G.background || scene == NULL)
		return NULL;

	if ((scene->camera == NULL) && (screen != NULL)) {
		sa = BKE_screen_find_big_area(screen, SPACE_VIEW3D, 0);
		ar = BKE_area_find_region_type(sa, RGN_TYPE_WINDOW);
		if (ar) {
			v3d = sa->spacedata.first;
		}
	}

	if (scene->camera == NULL && v3d == NULL) {
		return NULL;
	}

	/* gets scaled to BLEN_THUMB_SIZE */
	if (scene->camera) {
		ibuf = ED_view3d_draw_offscreen_imbuf_simple(scene, scene->camera,
		                                             BLEN_THUMB_SIZE * 2, BLEN_THUMB_SIZE * 2,
		                                             IB_rect, OB_SOLID, false, false, R_ADDSKY, err_out);
	}
	else {
		ibuf = ED_view3d_draw_offscreen_imbuf(scene, v3d, ar, BLEN_THUMB_SIZE * 2, BLEN_THUMB_SIZE * 2,
		                                      IB_rect, false, R_ADDSKY, err_out);
	}

	if (ibuf) {
		float aspect = (scene->r.xsch * scene->r.xasp) / (scene->r.ysch * scene->r.yasp);

		/* dirty oversampling */
		IMB_scaleImBuf(ibuf, BLEN_THUMB_SIZE, BLEN_THUMB_SIZE);

		/* add pretty overlay */
		IMB_overlayblend_thumb(ibuf->rect, ibuf->x, ibuf->y, aspect);
		
		/* first write into thumb buffer */
		thumb = MEM_mallocN(((2 + (BLEN_THUMB_SIZE * BLEN_THUMB_SIZE))) * sizeof(int), "write_file thumb");

		thumb[0] = BLEN_THUMB_SIZE;
		thumb[1] = BLEN_THUMB_SIZE;

		memcpy(thumb + 2, ibuf->rect, BLEN_THUMB_SIZE * BLEN_THUMB_SIZE * sizeof(int));
	}
	else {
		/* '*thumb_pt' needs to stay NULL to prevent a bad thumbnail from being handled */
		fprintf(stderr, "blend_file_thumb failed to create thumbnail: %s\n", err_out);
		thumb = NULL;
	}
	
	/* must be freed by caller */
	*thumb_pt = thumb;
	
	return ibuf;
}

/* easy access from gdb */
bool write_crash_blend(void)
{
	char path[FILE_MAX];
	int fileflags = G.fileflags & ~(G_FILE_HISTORY); /* don't do file history on crash file */

	BLI_strncpy(path, G.main->name, sizeof(path));
	BLI_replace_extension(path, sizeof(path), "_crash.blend");
	if (BLO_write_file(G.main, path, fileflags, NULL, NULL)) {
		printf("written: %s\n", path);
		return 1;
	}
	else {
		printf("failed: %s\n", path);
		return 0;
	}
}

/**
 * \see #wm_homefile_write_exec wraps #BLO_write_file in a similar way.
 */
int wm_file_write(bContext *C, const char *filepath, int fileflags, ReportList *reports)
{
	Library *li;
	int len;
	int *thumb = NULL;
	ImBuf *ibuf_thumb = NULL;

	len = strlen(filepath);
	
	if (len == 0) {
		BKE_report(reports, RPT_ERROR, "Path is empty, cannot save");
		return -1;
	}

	if (len >= FILE_MAX) {
		BKE_report(reports, RPT_ERROR, "Path too long, cannot save");
		return -1;
	}
	
	/* Check if file write permission is ok */
	if (BLI_exists(filepath) && !BLI_file_is_writable(filepath)) {
		BKE_reportf(reports, RPT_ERROR, "Cannot save blend file, path '%s' is not writable", filepath);
		return -1;
	}
 
	/* note: used to replace the file extension (to ensure '.blend'),
	 * no need to now because the operator ensures,
	 * its handy for scripts to save to a predefined name without blender editing it */
	
	/* send the OnSave event */
	for (li = G.main->library.first; li; li = li->id.next) {
		if (BLI_path_cmp(li->filepath, filepath) == 0) {
			BKE_reportf(reports, RPT_ERROR, "Cannot overwrite used library '%.240s'", filepath);
			return -1;
		}
	}

	/* blend file thumbnail */
	/* save before exit_editmode, otherwise derivedmeshes for shared data corrupt #27765) */
	if ((U.flag & USER_SAVE_PREVIEWS) && BLI_thread_is_main()) {
		ibuf_thumb = blend_file_thumb(CTX_data_scene(C), CTX_wm_screen(C), &thumb);
	}

	BLI_callback_exec(G.main, NULL, BLI_CB_EVT_SAVE_PRE);

	/* operator now handles overwrite checks */

	if (G.fileflags & G_AUTOPACK) {
		packAll(G.main, reports);
	}

	/* don't forget not to return without! */
	WM_cursor_wait(1);
	
	ED_editors_flush_edits(C, false);

	fileflags |= G_FILE_HISTORY; /* write file history */

	/* first time saving */
	/* XXX temp solution to solve bug, real fix coming (ton) */
	if ((G.main->name[0] == '\0') && !(fileflags & G_FILE_SAVE_COPY)) {
		BLI_strncpy(G.main->name, filepath, sizeof(G.main->name));
	}

	/* XXX temp solution to solve bug, real fix coming (ton) */
	G.main->recovered = 0;
	
	if (BLO_write_file(CTX_data_main(C), filepath, fileflags, reports, thumb)) {
		if (!(fileflags & G_FILE_SAVE_COPY)) {
			G.relbase_valid = 1;
			BLI_strncpy(G.main->name, filepath, sizeof(G.main->name));  /* is guaranteed current file */
	
			G.save_over = 1; /* disable untitled.blend convention */
		}

		BKE_BIT_TEST_SET(G.fileflags, fileflags & G_FILE_COMPRESS, G_FILE_COMPRESS);
		BKE_BIT_TEST_SET(G.fileflags, fileflags & G_FILE_AUTOPLAY, G_FILE_AUTOPLAY);

		/* prevent background mode scripts from clobbering history */
		if (!G.background) {
			write_history();
		}

		BLI_callback_exec(G.main, NULL, BLI_CB_EVT_SAVE_POST);

		/* run this function after because the file cant be written before the blend is */
		if (ibuf_thumb) {
			IMB_thumb_delete(filepath, THB_FAIL); /* without this a failed thumb overrides */
			ibuf_thumb = IMB_thumb_create(filepath, THB_NORMAL, THB_SOURCE_BLEND, ibuf_thumb);
			IMB_freeImBuf(ibuf_thumb);
		}

		if (thumb) MEM_freeN(thumb);
	}
	else {
		if (ibuf_thumb) IMB_freeImBuf(ibuf_thumb);
		if (thumb) MEM_freeN(thumb);
		
		WM_cursor_wait(0);
		return -1;
	}

	WM_cursor_wait(0);
	
	return 0;
}

/**
 * \see #wm_file_write wraps #BLO_write_file in a similar way.
 */
int wm_homefile_write_exec(bContext *C, wmOperator *op)
{
	wmWindowManager *wm = CTX_wm_manager(C);
	wmWindow *win = CTX_wm_window(C);
	char filepath[FILE_MAX];
	int fileflags;

	BLI_callback_exec(G.main, NULL, BLI_CB_EVT_SAVE_PRE);

	/* check current window and close it if temp */
	if (win && win->screen->temp)
		wm_window_close(C, wm, win);
	
	/* update keymaps in user preferences */
	WM_keyconfig_update(wm);
	
	BLI_make_file_string("/", filepath, BLI_get_folder_create(BLENDER_USER_CONFIG, NULL), BLENDER_STARTUP_FILE);
	printf("trying to save homefile at %s ", filepath);
	
	ED_editors_flush_edits(C, false);

	/*  force save as regular blend file */
	fileflags = G.fileflags & ~(G_FILE_COMPRESS | G_FILE_AUTOPLAY | G_FILE_LOCK | G_FILE_SIGN | G_FILE_HISTORY);

	if (BLO_write_file(CTX_data_main(C), filepath, fileflags | G_FILE_USERPREFS, op->reports, NULL) == 0) {
		printf("fail\n");
		return OPERATOR_CANCELLED;
	}
	
	printf("ok\n");

	G.save_over = 0;

	BLI_callback_exec(G.main, NULL, BLI_CB_EVT_SAVE_POST);

	return OPERATOR_FINISHED;
}

/* Only save the prefs block. operator entry */
int wm_userpref_write_exec(bContext *C, wmOperator *op)
{
	wmWindowManager *wm = CTX_wm_manager(C);
	char filepath[FILE_MAX];
	
	/* update keymaps in user preferences */
	WM_keyconfig_update(wm);
	
	BLI_make_file_string("/", filepath, BLI_get_folder_create(BLENDER_USER_CONFIG, NULL), BLENDER_USERPREF_FILE);
	printf("trying to save userpref at %s ", filepath);
	
	if (BKE_write_file_userdef(filepath, op->reports) == 0) {
		printf("fail\n");
		return OPERATOR_CANCELLED;
	}
	
	printf("ok\n");
	
	return OPERATOR_FINISHED;
}

/************************ autosave ****************************/

void wm_autosave_location(char *filepath)
{
	const int pid = abs(getpid());
	char path[1024];
#ifdef WIN32
	const char *savedir;
#endif

	if (G.main && G.relbase_valid) {
		const char *basename = BLI_path_basename(G.main->name);
		int len = strlen(basename) - 6;
		BLI_snprintf(path, sizeof(path), "%.*s-%d.blend", len, basename, pid);
	}
	else {
		BLI_snprintf(path, sizeof(path), "%d.blend", pid);
	}

#ifdef WIN32
	/* XXX Need to investigate how to handle default location of '/tmp/'
	 * This is a relative directory on Windows, and it may be
	 * found. Example:
	 * Blender installed on D:\ drive, D:\ drive has D:\tmp\
	 * Now, BLI_exists() will find '/tmp/' exists, but
	 * BLI_make_file_string will create string that has it most likely on C:\
	 * through get_default_root().
	 * If there is no C:\tmp autosave fails. */
	if (!BLI_exists(BLI_temp_dir_base())) {
		savedir = BLI_get_folder_create(BLENDER_USER_AUTOSAVE, NULL);
		BLI_make_file_string("/", filepath, savedir, path);
		return;
	}
#endif

	BLI_make_file_string("/", filepath, BLI_temp_dir_base(), path);
}

void WM_autosave_init(wmWindowManager *wm)
{
	wm_autosave_timer_ended(wm);

	if (U.flag & USER_AUTOSAVE)
		wm->autosavetimer = WM_event_add_timer(wm, NULL, TIMERAUTOSAVE, U.savetime * 60.0);
}

void wm_autosave_timer(const bContext *C, wmWindowManager *wm, wmTimer *UNUSED(wt))
{
	wmWindow *win;
	wmEventHandler *handler;
	char filepath[FILE_MAX];
	
	WM_event_remove_timer(wm, NULL, wm->autosavetimer);

	/* if a modal operator is running, don't autosave, but try again in 10 seconds */
	for (win = wm->windows.first; win; win = win->next) {
		for (handler = win->modalhandlers.first; handler; handler = handler->next) {
			if (handler->op) {
				wm->autosavetimer = WM_event_add_timer(wm, NULL, TIMERAUTOSAVE, 10.0);
				return;
			}
		}
	}

	ED_editors_flush_edits(C, false);

	wm_autosave_location(filepath);

	if (U.uiflag & USER_GLOBALUNDO) {
		/* fast save of last undobuffer, now with UI */
		BKE_undo_save_file(filepath);
	}
	else {
		/*  save as regular blend file */
		int fileflags = G.fileflags & ~(G_FILE_COMPRESS | G_FILE_AUTOPLAY | G_FILE_LOCK | G_FILE_SIGN | G_FILE_HISTORY);

		/* no error reporting to console */
		BLO_write_file(CTX_data_main(C), filepath, fileflags, NULL, NULL);
	}
	/* do timer after file write, just in case file write takes a long time */
	wm->autosavetimer = WM_event_add_timer(wm, NULL, TIMERAUTOSAVE, U.savetime * 60.0);
}

void wm_autosave_timer_ended(wmWindowManager *wm)
{
	if (wm->autosavetimer) {
		WM_event_remove_timer(wm, NULL, wm->autosavetimer);
		wm->autosavetimer = NULL;
	}
}

void wm_autosave_delete(void)
{
	char filename[FILE_MAX];
	
	wm_autosave_location(filename);

	if (BLI_exists(filename)) {
		char str[FILE_MAX];
		BLI_make_file_string("/", str, BLI_temp_dir_base(), BLENDER_QUIT_FILE);

		/* if global undo; remove tempsave, otherwise rename */
		if (U.uiflag & USER_GLOBALUNDO) BLI_delete(filename, false, false);
		else BLI_rename(filename, str);
	}
}

void wm_autosave_read(bContext *C, ReportList *reports)
{
	char filename[FILE_MAX];

	wm_autosave_location(filename);
	WM_file_read(C, filename, reports);
}


/** \name Initialize WM_OT_open_xxx properties
 *
 * Check if load_ui was set by the caller.
 * Fall back to user preference when file flags not specified.
 *
 * \{ */

void wm_open_init_load_ui(wmOperator *op, bool use_prefs)
{
	PropertyRNA *prop = RNA_struct_find_property(op->ptr, "load_ui");
	if (!RNA_property_is_set(op->ptr, prop)) {
		bool value = use_prefs ?
		             ((U.flag & USER_FILENOUI) == 0) :
		             ((G.fileflags & G_FILE_NO_UI) == 0);

		RNA_property_boolean_set(op->ptr, prop, value);
	}
}

void wm_open_init_use_scripts(wmOperator *op, bool use_prefs)
{
	PropertyRNA *prop = RNA_struct_find_property(op->ptr, "use_scripts");
	if (!RNA_property_is_set(op->ptr, prop)) {
		/* use G_SCRIPT_AUTOEXEC rather than the userpref because this means if
		 * the flag has been disabled from the command line, then opening
		 * from the menu wont enable this setting. */
		bool value = use_prefs ?
		             ((U.flag & USER_SCRIPT_AUTOEXEC_DISABLE) == 0) :
		             ((G.f & G_SCRIPT_AUTOEXEC) != 0);

		RNA_property_boolean_set(op->ptr, prop, value);
	}
}

/** \} */
