/* Internal bookmarks support */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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

#include "elinks.h"

#include "bfu/dialog.h"
#include "bfu/hierbox.h"
#include "bookmarks/backend/common.h"
#include "bookmarks/bookmarks.h"
#include "bookmarks/dialogs.h"
#include "config/home.h"
#include "config/options.h"
#include "intl/gettext/libintl.h"
#include "main/module.h"
#include "main/object.h"
#include "protocol/uri.h"
#include "session/task.h"
#include "terminal/tab.h"
#include "util/conv.h"
#include "util/hash.h"
#include "util/lists.h"
#include "util/memory.h"
#include "util/secsave.h"
#include "util/string.h"

/* The list of bookmarks */
INIT_LIST_HEAD(bookmarks);

/* Set to 1, if bookmarks have changed. */
static int bookmarks_dirty = 0;

static struct hash *bookmark_cache = NULL;

static struct bookmark *bm_snapshot_last_folder;


/* Life functions */

static struct option_info bookmark_options_info[] = {
	INIT_OPT_TREE("", N_("Bookmarks"),
		"bookmarks", 0,
		N_("Bookmark options.")),

#ifdef CONFIG_XBEL_BOOKMARKS
	INIT_OPT_INT("bookmarks", N_("File format"),
		"file_format", 0, 0, 1, 0,
		N_("File format for bookmarks (affects both reading and saving):\n"
		"0 is the default native ELinks format\n"
		"1 is XBEL universal XML bookmarks format (NO NATIONAL CHARS SUPPORT!)")),
#else
	INIT_OPT_INT("bookmarks", N_("File format"),
		"file_format", 0, 0, 1, 0,
		N_("File format for bookmarks (affects both reading and saving):\n"
		"0 is the default native ELinks format\n"
		"1 is XBEL universal XML bookmarks format (NO NATIONAL CHARS SUPPORT!)"
		"  (DISABLED)")),
#endif

	INIT_OPT_BOOL("bookmarks", N_("Save folder state"),
		"folder_state", 0, 1,
		N_("When saving bookmarks also store whether folders are\n"
		"expanded or not, so the look of the bookmark dialog is\n"
		"kept across ELinks sessions. If disabled all folders will\n"
		"appear unexpanded next time ELinks is run.")),

	INIT_OPT_BOOL("ui.sessions", N_("Periodic snapshotting"),
		"snapshot", 0, 0,
		N_("Automatically save a snapshot of all tabs periodically.\n"
		"This will periodically bookmark the tabs of each terminal in a separate folder\n"
		"for recovery after a crash.\n\n"
		"This feature requires bookmark support.")),

	NULL_OPTION_INFO
};

static enum evhook_status bookmark_change_hook(va_list ap, void *data);
static enum evhook_status bookmark_write_hook(va_list ap, void *data);

struct event_hook_info bookmark_hooks[] = {
	{ "bookmark-delete", 0, bookmark_change_hook, NULL },
	{ "bookmark-move",   0, bookmark_change_hook, NULL },
	{ "bookmark-update", 0, bookmark_change_hook, NULL },
	{ "periodic-saving", 0, bookmark_write_hook,  NULL },

	NULL_EVENT_HOOK_INFO,
};

static enum evhook_status
bookmark_change_hook(va_list ap, void *data)
{
	struct bookmark *bookmark = va_arg(ap, struct bookmark *);

	if (bookmark == bm_snapshot_last_folder)
		bm_snapshot_last_folder = NULL;

	return EVENT_HOOK_STATUS_NEXT;
}

static void bookmark_snapshot();

static enum evhook_status
bookmark_write_hook(va_list ap, void *data)
{
	if (get_opt_bool("ui.sessions.snapshot")
	    && !get_cmd_opt_bool("anonymous"))
		bookmark_snapshot();

	write_bookmarks();

	return EVENT_HOOK_STATUS_NEXT;
}


void bookmarks_set_dirty(void);

static int
change_hook_folder_state(struct session *ses, struct option *current,
			 struct option *changed)
{
	if (!changed->value.number) {
		/* We are to collapse all folders on exit; mark bookmarks dirty
		 * to ensure that this will happen. */
		bookmarks_set_dirty();
	}

	return 0;
}

static void
init_bookmarks(struct module *module)
{
	struct change_hook_info bookmarks_change_hooks[] = {
		{ "bookmarks.folder_state", change_hook_folder_state },
		{ NULL,			    NULL },
	};

	register_change_hooks(bookmarks_change_hooks);

	read_bookmarks();
}

/* Clears the bookmark list */
static void
free_bookmarks(struct list_head *bookmarks_list,
	       struct list_head *box_items)
{
	struct bookmark *bm;

	foreach (bm, *bookmarks_list) {
		if (!list_empty(bm->child))
			free_bookmarks(&bm->child, &bm->box_item->child);
		mem_free(bm->title);
		mem_free(bm->url);
	}

	free_list(*box_items);
	free_list(*bookmarks_list);
	if (bookmark_cache) {
		free_hash(bookmark_cache);
		bookmark_cache = NULL;
	}
}

/* Does final cleanup and saving of bookmarks */
static void
done_bookmarks(struct module *module)
{
	/* This is a clean shutdown, so delete the last snapshot. */
	if (bm_snapshot_last_folder) delete_bookmark(bm_snapshot_last_folder);
	bm_snapshot_last_folder = NULL;

	write_bookmarks();
	free_bookmarks(&bookmarks, &bookmark_browser.root.child);
	free_last_searched_bookmark();
}

struct module bookmarks_module = struct_module(
	/* name: */		N_("Bookmarks"),
	/* options: */		bookmark_options_info,
	/* hooks: */		bookmark_hooks,
	/* submodules: */	NULL,
	/* data: */		NULL,
	/* init: */		init_bookmarks,
	/* done: */		done_bookmarks
);



/* Read/write wrappers */

/* Loads the bookmarks from file */
void
read_bookmarks(void)
{
	bookmarks_read();
}

void
write_bookmarks(void)
{
	if (get_cmd_opt_bool("anonymous")) {
		bookmarks_unset_dirty();
		return;
	}
	bookmarks_write(&bookmarks);
}




/* Bookmarks manipulation */

void
bookmarks_set_dirty(void)
{
	bookmarks_dirty = 1;
}

void
bookmarks_unset_dirty(void)
{
	bookmarks_dirty = 0;
}

int
bookmarks_are_dirty(void)
{
	return (bookmarks_dirty == 1);
}

#define check_bookmark_cache(url) (bookmark_cache && (url) && *(url))

static void
done_bookmark(struct bookmark *bm)
{
	done_listbox_item(&bookmark_browser, bm->box_item);

	mem_free(bm->title);
	mem_free(bm->url);
	mem_free(bm);
}

/* Deletes a bookmark. Returns 0 on failure (no such bm), 1 on success. */
void
delete_bookmark(struct bookmark *bm)
{
	static int delete_bookmark_event_id = EVENT_NONE;

	while (!list_empty(bm->child)) {
		delete_bookmark(bm->child.next);
	}

	if (check_bookmark_cache(bm->url)) {
		struct hash_item *item;

		item = get_hash_item(bookmark_cache, bm->url, strlen(bm->url));
		if (item) del_hash_item(bookmark_cache, item);
	}

	set_event_id(delete_bookmark_event_id, "bookmark-delete");
	trigger_event(delete_bookmark_event_id, bm);

	del_from_list(bm);
	bookmarks_set_dirty();

	done_bookmark(bm);
}

/* Deletes any bookmarks with no URLs (i.e., folders) and of which
 * the title matches the given argument. */
static void
delete_folder_by_name(unsigned char *foldername)
{
	struct bookmark *bookmark, *next;

	foreachsafe (bookmark, next, bookmarks) {
		if ((bookmark->url && *bookmark->url)
		    || strcmp(bookmark->title, foldername))
			continue;

		delete_bookmark(bookmark);
	}
}

static struct bookmark *
init_bookmark(struct bookmark *root, unsigned char *title, unsigned char *url)
{
	struct bookmark *bm;

	bm = mem_calloc(1, sizeof(*bm));
	if (!bm) return NULL;

	bm->title = stracpy(title);
	if (!bm->title) {
		mem_free(bm);
		return NULL;
	}
	sanitize_title(bm->title);

	bm->url = stracpy(empty_string_or_(url));
	if (!bm->url) {
		mem_free(bm->title);
		mem_free(bm);
		return NULL;
	}
	sanitize_url(bm->url);

	bm->root = root;
	init_list(bm->child);

	object_nolock(bm, "bookmark");

	return bm;
}

static void
add_bookmark_item_to_bookmarks(struct bookmark *bm, struct bookmark *root, int place)
{
	/* Actually add it */
	if (place) {
		if (root)
			add_to_list_end(root->child, bm);
		else
			add_to_list_end(bookmarks, bm);
	} else {
		if (root)
			add_to_list(root->child, bm);
		else
			add_to_list(bookmarks, bm);
	}
	bookmarks_set_dirty();

	/* Hash creation if needed. */
	if (!bookmark_cache)
		bookmark_cache = init_hash(8, &strhash);

	/* Create a new entry. */
	if (check_bookmark_cache(bm->url))
		add_hash_item(bookmark_cache, bm->url, strlen(bm->url), bm);
}

/* Adds a bookmark to the bookmark list. Place 0 means top, place 1 means
 * bottom. NULL or "" @url means it is a bookmark folder. */
struct bookmark *
add_bookmark(struct bookmark *root, int place, unsigned char *title,
	     unsigned char *url)
{
	enum listbox_item_type type;
	struct bookmark *bm;

	bm = init_bookmark(root, title, url);
	if (!bm) return NULL;

	if (url && *url) {
		type = BI_LEAF;
	} else if (title && title[0] == '-' && title[1] == '\0') {
		type = BI_SEPARATOR;
	} else {
		type = BI_FOLDER;
	}

	/* Setup box_item */
	bm->box_item = add_listbox_item(&bookmark_browser,
					root ? root->box_item : NULL,
					type,
					(void *) bm,
					place ? -1 : 1);

	if (!bm->box_item) {
		mem_free(bm->url);
		mem_free(bm->title);
		mem_free(bm);
		return NULL;
	}

	add_bookmark_item_to_bookmarks(bm, root, place);

	return bm;
}

/* Updates an existing bookmark.
 *
 * If there's any problem, return 0. Otherwise, return 1.
 *
 * If any of the fields are NULL, the value is left unchanged. */
int
update_bookmark(struct bookmark *bm, unsigned char *title,
		unsigned char *url)
{
	static int update_bookmark_event_id = EVENT_NONE;
	unsigned char *title2 = NULL;
	unsigned char *url2 = NULL;

	if (url) {
		url2 = stracpy(url);
		if (!url2) return 0;
		sanitize_url(url2);
	}

	if (title) {
		title2 = stracpy(title);
		if (!title2) {
			mem_free_if(url2);
			return 0;
		}
		sanitize_title(title2);
	}

	set_event_id(update_bookmark_event_id, "bookmark-update");
	trigger_event(update_bookmark_event_id, bm, title2, url2);

	if (title2) {
		mem_free(bm->title);
		bm->title = title2;
	}

	if (url2) {
		if (check_bookmark_cache(bm->url)) {
			struct hash_item *item;
			int len = strlen(bm->url);

			item = get_hash_item(bookmark_cache, bm->url, len);
			if (item) del_hash_item(bookmark_cache, item);
		}

		if (check_bookmark_cache(url2)) {
			add_hash_item(bookmark_cache, url2, strlen(url2), bm);
		}

		mem_free(bm->url);
		bm->url = url2;
	}

	bookmarks_set_dirty();

	return 1;
}

/* Search bookmark cache for item matching url. */
struct bookmark *
get_bookmark(unsigned char *url)
{
	struct hash_item *item;

	if (!check_bookmark_cache(url))
		return NULL;

	/* Search for cached entry. */

	item = get_hash_item(bookmark_cache, url, strlen(url));

	return item ? item->value : NULL;
}

static void
bookmark_terminal(struct terminal *term, struct bookmark *folder)
{
	unsigned char title[MAX_STR_LEN], url[MAX_STR_LEN];
	struct window *tab;

	foreachback_tab (tab, term->windows) {
		struct session *ses = tab->data;

		if (!get_current_url(ses, url, MAX_STR_LEN))
			continue;

		if (!get_current_title(ses, title, MAX_STR_LEN))
			continue;

		add_bookmark(folder, 1, title, url);
	}
}

void
bookmark_terminal_tabs(struct terminal *term, unsigned char *foldername)
{
	struct bookmark *folder = add_bookmark(NULL, 1, foldername, NULL);

	if (!folder) return;

	bookmark_terminal(term, folder);
}

static void
bookmark_all_terminals(struct bookmark *folder)
{
	unsigned int n = 0;
	struct terminal *term;

	if (get_cmd_opt_bool("anonymous"))
		return;

	if (list_is_singleton(terminals)) {
		bookmark_terminal(terminals.next, folder);
		return;
	}

	foreach (term, terminals) {
		unsigned char subfoldername[4];
		struct bookmark *subfolder;

		if (ulongcat(subfoldername, NULL, n, sizeof(subfoldername), 0)
		     >= sizeof(subfoldername))
			return;

		++n;

		subfolder = add_bookmark(folder, 1, subfoldername, NULL);
		if (!subfolder) return;

		bookmark_terminal(term, subfolder);
	}
}


void
bookmark_auto_save_tabs(struct terminal *term)
{
	unsigned char *foldername;

	if (get_cmd_opt_bool("anonymous")
	    || !get_opt_bool("ui.sessions.auto_save"))
		return;

	foldername = get_opt_str("ui.sessions.auto_save_foldername");
	if (!*foldername) return;

	/* Ensure uniqueness of the auto save folder, so it is possible to
	 * restore the (correct) session when starting up. */
	delete_folder_by_name(foldername);

	bookmark_terminal_tabs(term, foldername);
}

static void
bookmark_snapshot()
{
	struct string folderstring;
	struct bookmark *folder;

	if (!init_string(&folderstring)) return;

	add_to_string(&folderstring, "Session snapshot");

#ifdef HAVE_STRFTIME
	add_to_string(&folderstring, " - ");
	add_date_to_string(&folderstring, get_opt_str("ui.date_format"), NULL);
#endif

	folder = add_bookmark(NULL, 1, folderstring.source, NULL);
	done_string(&folderstring);
	if (!folder) return;

	bookmark_all_terminals(folder);

	if (bm_snapshot_last_folder) delete_bookmark(bm_snapshot_last_folder);
	bm_snapshot_last_folder = folder;
}


void
open_bookmark_folder(struct session *ses, unsigned char *foldername)
{
	struct bookmark *bookmark;
	struct bookmark *folder = NULL;
	struct bookmark *current = NULL;

	assert(foldername && ses);
	if_assert_failed return;

	foreach (bookmark, bookmarks) {
		if (bookmark->box_item->type != BI_FOLDER)
			continue;
		if (strcmp(bookmark->title, foldername))
			continue;
		folder = bookmark;
		break;
	}

	if (!folder) return;

	foreach (bookmark, folder->child) {
		struct uri *uri;

		if (bookmark->box_item->type == BI_FOLDER
		    || bookmark->box_item->type == BI_SEPARATOR
		    || !*bookmark->url)
			continue;

		uri = get_translated_uri(bookmark->url, 0);
		if (!uri) continue;

		/* Save the first bookmark for the current tab */
		if (!current) {
			current = bookmark;
			goto_uri(ses, uri);
		} else {
			open_uri_in_new_tab(ses, uri, 1, 0);
		}

		done_uri(uri);
	}
}