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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIPrefBranch.idl"
+
+%{C++
+struct PrefTuple;
+#include "nsTArrayForwardDeclare.h"
+%}
+
+[ptr] native nsPreferencesArrayPtr(nsTArray<PrefTuple>);
+[ptr] native nsPreferencePtr(PrefTuple);
+[ptr] native nsPreferencePtrConst(const PrefTuple);
+
+interface nsIFile;
+
+/**
+ * The nsIPrefService interface is the main entry point into the back end
+ * preferences management library. The preference service is directly
+ * responsible for the management of the preferences files and also facilitates
+ * access to the preference branch object which allows the direct manipulation
+ * of the preferences themselves.
+ *
+ * @see nsIPrefBranch
+ */
+
+[scriptable, uuid(1f84fd56-3956-40df-b86a-1ea01402ee96)]
+interface nsIPrefService : nsISupports
+{
+ /**
+ * Called to read in the preferences specified in a user preference file.
+ *
+ * @param aFile The file to be read.
+ *
+ * @note
+ * If nullptr is passed in for the aFile parameter the default preferences
+ * file(s) [prefs.js, user.js] will be read and processed.
+ *
+ * @throws Error File failed to read or contained invalid data.
+ *
+ * @see savePrefFile
+ * @see nsIFile
+ */
+ void readUserPrefs(in nsIFile aFile);
+
+ /**
+ * Called to completely flush and re-initialize the preferences system.
+ *
+ * @throws Error The preference service failed to restart correctly.
+ */
+ void resetPrefs();
+
+ /**
+ * Called to reset all preferences with user set values back to the
+ * application default values.
+ */
+ void resetUserPrefs();
+
+ /**
+ * Called to write current preferences state to a file.
+ *
+ * @param aFile The file to be written.
+ *
+ * @note
+ * If nullptr is passed in for the aFile parameter the preference data is
+ * written out to the current preferences file (usually prefs.js.)
+ *
+ * @throws Error File failed to write.
+ *
+ * @see readUserPrefs
+ * @see nsIFile
+ */
+ void savePrefFile(in nsIFile aFile);
+
+ /**
+ * Call to get a Preferences "Branch" which accesses user preference data.
+ * Using a Set method on this object will always create or set a user
+ * preference value. When using a Get method a user set value will be
+ * returned if one exists, otherwise a default value will be returned.
+ *
+ * @param aPrefRoot The preference "root" on which to base this "branch".
+ * For example, if the root "browser.startup." is used, the
+ * branch will be able to easily access the preferences
+ * "browser.startup.page", "browser.startup.homepage", or
+ * "browser.startup.homepage_override" by simply requesting
+ * "page", "homepage", or "homepage_override". nullptr or ""
+ * may be used to access to the entire preference "tree".
+ *
+ * @return nsIPrefBranch The object representing the requested branch.
+ *
+ * @see getDefaultBranch
+ */
+ nsIPrefBranch getBranch(in string aPrefRoot);
+
+ /**
+ * Call to get a Preferences "Branch" which accesses only the default
+ * preference data. Using a Set method on this object will always create or
+ * set a default preference value. When using a Get method a default value
+ * will always be returned.
+ *
+ * @param aPrefRoot The preference "root" on which to base this "branch".
+ * For example, if the root "browser.startup." is used, the
+ * branch will be able to easily access the preferences
+ * "browser.startup.page", "browser.startup.homepage", or
+ * "browser.startup.homepage_override" by simply requesting
+ * "page", "homepage", or "homepage_override". nullptr or ""
+ * may be used to access to the entire preference "tree".
+ *
+ * @note
+ * Few consumers will want to create default branch objects. Many of the
+ * branch methods do nothing on a default branch because the operations only
+ * make sense when applied to user set preferences.
+ *
+ * @return nsIPrefBranch The object representing the requested default branch.
+ *
+ * @see getBranch
+ */
+ nsIPrefBranch getDefaultBranch(in string aPrefRoot);
+
+ /**
+ * The preference service is 'dirty' if there are changes to user preferences
+ * that have not been written to disk
+ */
+ readonly attribute boolean dirty;
+};
+
+%{C++
+
+#define NS_PREFSERVICE_CID \
+ { /* {1cd91b88-1dd2-11b2-92e1-ed22ed298000} */ \
+ 0x91ca2441, \
+ 0x050f, \
+ 0x4f7c, \
+ { 0x9d, 0xf8, 0x75, 0xb4, 0x0e, 0xa4, 0x01, 0x56 } \
+ }
+
+#define NS_PREFSERVICE_CONTRACTID "@mozilla.org/preferences-service;1"
+
+/**
+ * Notification sent before reading the default user preferences files.
+ */
+#define NS_PREFSERVICE_READ_TOPIC_ID "prefservice:before-read-userprefs"
+
+/**
+ * Notification sent when resetPrefs has been called, but before the actual
+ * reset process occurs.
+ */
+#define NS_PREFSERVICE_RESET_TOPIC_ID "prefservice:before-reset"
+
+/**
+ * Notification sent when after reading app-provided default
+ * preferences, but before user profile override defaults or extension
+ * defaults are loaded.
+ */
+#define NS_PREFSERVICE_APPDEFAULTS_TOPIC_ID "prefservice:after-app-defaults"
+
+%}