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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_IHistory_h_
+#define mozilla_IHistory_h_
+
+#include "nsISupports.h"
+#include "nsURIHashKey.h"
+#include "nsTHashSet.h"
+#include "nsTObserverArray.h"
+
+class nsIURI;
+class nsIWidget;
+
+namespace mozilla {
+
+namespace dom {
+class ContentParent;
+class Document;
+class Link;
+} // namespace dom
+
+// 0057c9d3-b98e-4933-bdc5-0275d06705e1
+#define IHISTORY_IID \
+ { \
+ 0x0057c9d3, 0xb98e, 0x4933, { \
+ 0xbd, 0xc5, 0x02, 0x75, 0xd0, 0x67, 0x05, 0xe1 \
+ } \
+ }
+
+class IHistory : public nsISupports {
+ public:
+ NS_DECLARE_STATIC_IID_ACCESSOR(IHISTORY_IID)
+
+ using ContentParentSet = nsTHashSet<RefPtr<dom::ContentParent>>;
+
+ /**
+ * Registers the Link for notifications about the visited-ness of aURI.
+ * Consumers should assume that the URI is unvisited after calling this, and
+ * they will be notified if that state (unvisited) changes by having
+ * VisitedQueryFinished called on themselves. Note that it may call
+ * synchronously if the answer is already known.
+ *
+ * @note VisitedQueryFinished must not call RegisterVisitedCallback or
+ * UnregisterVisitedCallback.
+ *
+ * @pre aURI must not be null.
+ * @pre aLink may be null only in the parent (chrome) process.
+ *
+ * @param aURI
+ * The URI to check.
+ * @param aLink
+ * The link to update whenever the history status changes. The
+ * implementation will only hold onto a raw pointer, so if this
+ * object should be destroyed, be sure to call
+ * UnregisterVistedCallback first.
+ */
+ virtual void RegisterVisitedCallback(nsIURI* aURI, dom::Link* aLink) = 0;
+
+ /**
+ * Schedules a single visited query from a given child process.
+ *
+ * @param aURI the URI to query.
+ * @param ContentParent the process interested in knowing about the visited
+ * state of this URI.
+ */
+ virtual void ScheduleVisitedQuery(nsIURI* aURI, dom::ContentParent*) = 0;
+
+ /**
+ * Unregisters a previously registered Link object. This must be called
+ * before destroying the registered object, and asserts when misused.
+ *
+ * @pre aURI must not be null.
+ * @pre aLink must not be null.
+ *
+ * @param aURI
+ * The URI that aLink was registered for.
+ * @param aLink
+ * The link object to unregister for aURI.
+ */
+ virtual void UnregisterVisitedCallback(nsIURI* aURI, dom::Link* aLink) = 0;
+
+ enum class VisitedStatus : uint8_t {
+ Unknown,
+ Visited,
+ Unvisited,
+ };
+
+ /**
+ * Notifies about the visited status of a given URI. The visited status cannot
+ * be unknown, otherwise there's no point in notifying of anything.
+ *
+ * @param ContentParentSet a set of content processes that are interested on
+ * this change. If null, it is broadcasted to all
+ * child processes.
+ */
+ virtual void NotifyVisited(nsIURI*, VisitedStatus,
+ const ContentParentSet* = nullptr) = 0;
+
+ enum VisitFlags {
+ /**
+ * Indicates whether the URI was loaded in a top-level window.
+ */
+ TOP_LEVEL = 1 << 0,
+ /**
+ * Indicates whether the URI is the target of a permanent redirect.
+ */
+ REDIRECT_PERMANENT = 1 << 1,
+ /**
+ * Indicates whether the URI is the target of a temporary redirect.
+ */
+ REDIRECT_TEMPORARY = 1 << 2,
+ /**
+ * Indicates the URI will redirect (Response code 3xx).
+ */
+ REDIRECT_SOURCE = 1 << 3,
+ /**
+ * Indicates the URI caused an error that is unlikely fixable by a
+ * retry, like a not found or unfetchable page.
+ */
+ UNRECOVERABLE_ERROR = 1 << 4,
+ /**
+ * If REDIRECT_SOURCE is set, this indicates that the redirect is permanent.
+ * Note this differs from REDIRECT_PERMANENT because that one refers to how
+ * we reached the URI, while this is used when the URI itself redirects.
+ */
+ REDIRECT_SOURCE_PERMANENT = 1 << 5
+ };
+
+ /**
+ * Adds a history visit for the URI.
+ *
+ * @pre aURI must not be null.
+ *
+ * @param aWidget
+ * The widget for the DocShell.
+ * @param aURI
+ * The URI of the page being visited.
+ * @param aLastVisitedURI
+ * The URI of the last visit in the chain.
+ * @param aFlags
+ * The VisitFlags describing this visit.
+ * @param aBrowserId
+ * The id of browser used for this visit.
+ */
+ NS_IMETHOD VisitURI(nsIWidget* aWidget, nsIURI* aURI, nsIURI* aLastVisitedURI,
+ uint32_t aFlags, uint64_t aBrowserId) = 0;
+
+ /**
+ * Set the title of the URI.
+ *
+ * @pre aURI must not be null.
+ *
+ * @param aURI
+ * The URI to set the title for.
+ * @param aTitle
+ * The title string.
+ */
+ NS_IMETHOD SetURITitle(nsIURI* aURI, const nsAString& aTitle) = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(IHistory, IHISTORY_IID)
+
+} // namespace mozilla
+
+#endif // mozilla_IHistory_h_