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/*
 * Application configuration
 *
 * Copyright (C) 2017  Patrick McDermott
 *
 * This file is part of Marquee.
 *
 * Marquee 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 3 of the License, or
 * (at your option) any later version.
 *
 * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "config.h"

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

#include <glib.h>

struct MqConfig {
	gchar      *profile;
	gchar      *file_name;
	GKeyFile   *key_file;
	gboolean    types_and_cbs_set;
	GHashTable *types_and_cbs;
};

enum type {
	TYPE_BOOLEAN,
	TYPE_INTEGER,
	TYPE_DOUBLE,
	TYPE_STRING,
};

union callback {
	MqConfigBooleanCallback boolean_cb;
	MqConfigIntegerCallback integer_cb;
	MqConfigDoubleCallback  double_cb;
	MqConfigStringCallback  string_cb;
};

struct callbacks {
	union callback    cb;
	gpointer          user_data;
	struct callbacks *next;
};

struct item {
	enum type         type;
	struct callbacks *callbacks;
};

#define SET_BOOL(NAME, VALUE) mq_config_set_boolean(config, NAME, VALUE)
#define SET_INT( NAME, VALUE) mq_config_set_integer(config, NAME, VALUE)
#define SET_DBL( NAME, VALUE) mq_config_set_double (config, NAME, VALUE)
#define SET_STR( NAME, VALUE) mq_config_set_string (config, NAME, VALUE)
#define SET_STRL(NAME, VALUE) mq_config_set_string (config, NAME, VALUE)

static void
set_defaults(MqConfig *config)
{
	config->types_and_cbs_set = FALSE;

	/* General -> Web Browsing */
	SET_STR ("tabs.new",                                  "home");
	SET_STR ("tabs.home",                                 "");  /* TODO */
	SET_BOOL("tabs.background",                           TRUE);
	SET_BOOL("tabs.warn-on-close",                        TRUE);

	/* General -> Navigation and Accessibility */
	SET_BOOL("navigation.smooth-scrolling",               TRUE);
	SET_BOOL("navigation.tabbing",                        TRUE);
	SET_BOOL("navigation.caret",                          FALSE);
	SET_BOOL("navigation.spatial",                        FALSE);

	/* General -> Spell Checking */
	SET_BOOL("spell.enable",                              TRUE);
	SET_STRL("spell.langs",                               "en_US");  // TODO

	/* General -> Miscellaneous */
	SET_BOOL("display.textarea.resize.enable",            TRUE);
	SET_BOOL("devtools.enable",                           TRUE);

	/* General -> Compatibility */
	SET_STR ("compatibility.user-agent",                  "default");
	SET_BOOL("compatibility.quirks",                      TRUE);

	/* Display -> Fonts */
	SET_STR ("font.family.default",                       "sans-serif");
	SET_STR ("font.family.monospace",                     "monospace");
	SET_STR ("font.family.serif",                         "serif");
	SET_STR ("font.family.sans-serif",                    "sans-serif");
	SET_STR ("font.family.cursive",                       "serif");
	SET_STR ("font.family.fantasy",                       "serif");
	SET_STR ("font.family.pictograph",                    "serif");
	SET_INT ("font.size.default",                         16);
	SET_INT ("font.size.monospace-default",               13);
	SET_INT ("font.size.minimum",                         0);

	/* Display -> Languages */
	SET_STRL("intl.accept-languages",                     "en-us");  // TODO
	SET_STR ("intl.default-charset",                      "iso-8859-1"); //^

	/* Display -> Zoom */
	SET_DBL ("zoom.default",                              1.00);
	SET_BOOL("zoom.text-only",                            FALSE);

	/* Permissions -> General */
	SET_BOOL("permissions.images.auto-load",              TRUE);
	SET_BOOL("permissions.images.favicons.override",      FALSE);
	SET_BOOL("permissions.java.enable",                   TRUE);
	SET_BOOL("permissions.javascript.enable",             TRUE);
	SET_BOOL("permissions.plugins.enable",                TRUE);

	/* Permissions -> JavaScript */
	SET_BOOL("permissions.javascript.open-windows",       FALSE);
	SET_BOOL("permissions.javascript.fullscreen",         TRUE);
	SET_BOOL("permissions.javascript.modal-dialogs",      FALSE);
	SET_BOOL("permissions.javascript.clipboard",          FALSE);

	/* Permissions -> Data Storage */
	SET_BOOL("permissions.javascript.database",           TRUE);
	SET_BOOL("permissions.javascript.storage",            TRUE);
	SET_BOOL("permissions.appcache",                      TRUE);

	/* Permissions -> Graphics and Multimedia */
	SET_BOOL("canvas.acceleration.enable",                FALSE);
	SET_BOOL("permissions.javascript.webgl",              FALSE);
	SET_BOOL("permissions.javascript.audio",              FALSE);
	SET_BOOL("media.autoplay",                            TRUE);
	SET_BOOL("media.force-fullscreen",                    FALSE);
	SET_BOOL("permissions.javascript.mediastream.enable", FALSE);
	SET_BOOL("permissions.javascript.mediasource.enable", FALSE);

	/* Security and Privacy -> History */
	SET_BOOL("privacy.private-browsing.enabled",          FALSE);
	SET_BOOL("privacy.remember.history",                  TRUE);
	SET_BOOL("privacy.remember.downloads",                TRUE);

	/* Security and Privacy -> Cookies */
	SET_STR ("cookies.accept",                            "always");

	/* Security and Privacy -> Security */
	SET_BOOL("security.xss-auditor.enable",               TRUE);

	/* Security and Privacy -> Network */
	SET_BOOL("dns.prefetch.enable",                       FALSE);

	/* Hidden window state preferences */
	SET_BOOL("window.maximized",                          FALSE);
	SET_INT ("window.width",                              1024);
	SET_INT ("window.height",                             768);

	/* Hidden directory preferences */
	SET_STR ("directories.open-file",                     "");
	SET_STR ("directories.downloads",
		g_get_user_special_dir(G_USER_DIRECTORY_DOWNLOAD));

	config->types_and_cbs_set = TRUE;
}

#undef SET_BOOL
#undef SET_INT
#undef SET_DBL
#undef SET_STR
#undef SET_STRL

MqConfig *
mq_config_new(const gchar *profile)
{
	MqConfig *config;

	config = malloc(sizeof(*config));

	config->profile = g_strdup(profile);
	config->file_name = g_build_filename(g_get_user_config_dir(),
		PACKAGE, profile, "config", NULL);
	config->key_file = g_key_file_new();
	config->types_and_cbs = g_hash_table_new(g_str_hash, g_int_equal);
	set_defaults(config);

	return config;
}

gboolean
mq_config_load(MqConfig *config)
{
	gchar *profile_dir;

	profile_dir = g_build_filename(g_get_user_config_dir(), PACKAGE,
		config->profile, NULL);
	g_mkdir_with_parents(profile_dir, 0700);
	g_free(profile_dir);

	/* TODO: Handle parsing and ENOENT errors differently? */
	return g_key_file_load_from_file(config->key_file, config->file_name,
		G_KEY_FILE_KEEP_COMMENTS | G_KEY_FILE_KEEP_TRANSLATIONS, NULL);
}

gboolean
mq_config_save(MqConfig *config)
{
	/* TODO: Handle GFileError? */
	return g_key_file_save_to_file(config->key_file, config->file_name,
		NULL);
}

static void
split_name(const gchar *name, gchar **group, gchar **key)
{
	*group = g_strdup(name);
	*key = strchr(*group, '.');
	*(key[0]) = '\0';
	++*key;
}

gboolean
mq_config_get_boolean(MqConfig *config, const gchar *name)
{
	gchar    *group;
	gchar    *key;
	gboolean  value;

	split_name(name, &group, &key);

	/* TODO: Handle value parsing errors? */
	value = g_key_file_get_boolean(config->key_file, group, key, NULL);

	g_free(group);

	return value;
}

gint
mq_config_get_integer(MqConfig *config, const gchar *name)
{
	gchar *group;
	gchar *key;
	gint   value;

	split_name(name, &group, &key);

	/* TODO: Handle value parsing errors? */
	value = g_key_file_get_integer(config->key_file, group, key, NULL);

	g_free(group);

	return value;
}

gdouble
mq_config_get_double(MqConfig *config, const gchar *name)
{
	gchar   *group;
	gchar   *key;
	gdouble  value;

	split_name(name, &group, &key);

	/* TODO: Handle value parsing errors? */
	value = g_key_file_get_double(config->key_file, group, key, NULL);

	g_free(group);

	return value;
}

gchar *
mq_config_get_string(MqConfig *config, const gchar *name)
{
	gchar *group;
	gchar *key;
	gchar *value;

	split_name(name, &group, &key);

	/* TODO: Handle value parsing errors? */
	value = g_key_file_get_string(config->key_file, group, key, NULL);

	g_free(group);

	return value;
}

gchar **
mq_config_get_string_list(MqConfig *config, const gchar *name)
{
	gchar  *group;
	gchar  *key;
	gchar **value;

	split_name(name, &group, &key);

	/* TODO: Handle value parsing errors? */
	value = g_key_file_get_string_list(config->key_file, group, key, NULL,
		NULL);

	g_free(group);

	return value;
}

static void
set_type_or_run_callbacks(MqConfig *config, const gchar *name,
	gconstpointer value, enum type type)
{
	struct item      *item;
	struct callbacks *cbs;

	if (!config->types_and_cbs_set) {
		item = g_malloc(sizeof(*item));
		item->type = type;
		item->callbacks = NULL;
		g_hash_table_insert(config->types_and_cbs, g_strdup(name),
			item);
	} else {
		item = g_hash_table_lookup(config->types_and_cbs, name);
		for (cbs = item->callbacks; cbs; cbs = cbs->next) {
			switch (item->type) {
				case TYPE_BOOLEAN:
					cbs->cb.boolean_cb(config, name,
						*((const gboolean *) value),
						cbs->user_data);
					break;
				case TYPE_INTEGER:
					cbs->cb.integer_cb(config, name,
						*((const gint *) value),
						cbs->user_data);
					break;
				case TYPE_DOUBLE:
					cbs->cb.double_cb(config, name,
						*((const gdouble *) value),
						cbs->user_data);
					break;
				case TYPE_STRING:
					cbs->cb.string_cb(config, name,
						(const gchar *) value,
						cbs->user_data);
					break;
			}
		}
	}
}

void
mq_config_set_boolean(MqConfig *config, const gchar *name, gboolean value)
{
	gchar *group;
	gchar *key;

	split_name(name, &group, &key);

	g_key_file_set_boolean(config->key_file, group, key, value);

	g_free(group);

	set_type_or_run_callbacks(config, name, &value, TYPE_BOOLEAN);
}

void
mq_config_set_integer(MqConfig *config, const gchar *name, gint value)
{
	gchar *group;
	gchar *key;

	split_name(name, &group, &key);

	g_key_file_set_integer(config->key_file, group, key, value);

	g_free(group);

	set_type_or_run_callbacks(config, name, &value, TYPE_INTEGER);
}

void
mq_config_set_double(MqConfig *config, const gchar *name, gdouble value)
{
	gchar *group;
	gchar *key;

	split_name(name, &group, &key);

	g_key_file_set_double(config->key_file, group, key, value);

	g_free(group);

	set_type_or_run_callbacks(config, name, &value, TYPE_DOUBLE);
}

void
mq_config_set_string(MqConfig *config, const gchar *name, const gchar *value)
{
	gchar *group;
	gchar *key;

	split_name(name, &group, &key);

	g_key_file_set_string(config->key_file, group, key, value);

	g_free(group);

	set_type_or_run_callbacks(config, name, value, TYPE_STRING);
}

gboolean
mq_config_set(MqConfig *config, const gchar *name, const gchar *value)
{
	struct item *item;
	gint         integer_value;
	gdouble      double_value;
	gchar       *endptr;

	item = g_hash_table_lookup(config->types_and_cbs, name);
	g_assert(item);

	switch (item->type) {
		case TYPE_BOOLEAN:
			/* value is "on" or "off" (as implemented in
			 * mq_html_input_checkbox()). */
			mq_config_set_boolean(config, name,
				value[1] == 'n' ? TRUE : FALSE);
			return TRUE;
		case TYPE_INTEGER:
			integer_value = strtol(value, &endptr, 10);
			if (*endptr != '\0') {
				return FALSE;
			}
			mq_config_set_integer(config, name, integer_value);
			return TRUE;
		case TYPE_DOUBLE:
			double_value = strtod(value, &endptr);
			if (*endptr != '\0') {
				return FALSE;
			}
			mq_config_set_double(config, name, double_value);
			return TRUE;
		case TYPE_STRING:
			mq_config_set_string(config, name, value);
			return TRUE;
	}

	g_assert_not_reached();
	return FALSE;
}

void
mq_config_notify_boolean(MqConfig *config, const gchar *name,
	MqConfigBooleanCallback callback, gpointer user_data)
{
	struct item      *item;
	struct callbacks *cbs;

	item = g_hash_table_lookup(config->types_and_cbs, name);
	g_assert(item->type == TYPE_BOOLEAN);

	cbs = g_malloc(sizeof(*cbs));
	cbs->cb.boolean_cb = callback;
	cbs->user_data = user_data;
	cbs->next = item->callbacks;

	item->callbacks = cbs;
}

void
mq_config_notify_integer(MqConfig *config, const gchar *name,
	MqConfigIntegerCallback callback, gpointer user_data)
{
	struct item      *item;
	struct callbacks *cbs;

	item = g_hash_table_lookup(config->types_and_cbs, name);
	g_assert(item->type == TYPE_INTEGER);

	cbs = g_malloc(sizeof(*cbs));
	cbs->cb.integer_cb = callback;
	cbs->user_data = user_data;
	cbs->next = item->callbacks;

	item->callbacks = cbs;
}

void
mq_config_notify_double(MqConfig *config, const gchar *name,
	MqConfigDoubleCallback callback, gpointer user_data)
{
	struct item      *item;
	struct callbacks *cbs;

	item = g_hash_table_lookup(config->types_and_cbs, name);
	g_assert(item->type == TYPE_DOUBLE);

	cbs = g_malloc(sizeof(*cbs));
	cbs->cb.double_cb = callback;
	cbs->user_data = user_data;
	cbs->next = item->callbacks;

	item->callbacks = cbs;
}

void
mq_config_notify_string(MqConfig *config, const gchar *name,
	MqConfigStringCallback callback, gpointer user_data)
{
	struct item      *item;
	struct callbacks *cbs;

	item = g_hash_table_lookup(config->types_and_cbs, name);
	g_assert(item->type == TYPE_STRING);

	cbs = g_malloc(sizeof(*cbs));
	cbs->cb.string_cb = callback;
	cbs->user_data = user_data;
	cbs->next = item->callbacks;

	item->callbacks = cbs;
}