History: Add range navigation control for grouped visits

chrome/browser/ui/webui/history_ui.cc

Index: chrome/browser/ui/webui/history_ui.cc
diff --git a/chrome/browser/ui/webui/history_ui.cc b/chrome/browser/ui/webui/history_ui.cc
index dff2bfd4de845584e6523284293e5705f1fc2dd2..af12d69699e07d1ac53cb931ad39a01242c5ba76 100644
--- a/chrome/browser/ui/webui/history_ui.cc
+++ b/chrome/browser/ui/webui/history_ui.cc
@@ -142,7 +142,7 @@ content::WebUIDataSource* CreateHistoryUIHTMLSource() {
   source->AddLocalizedString("rangenone", IDS_HISTORY_RANGE_NONE);
   source->AddLocalizedString("rangeweek", IDS_HISTORY_RANGE_WEEK);
   source->AddLocalizedString("rangemonth", IDS_HISTORY_RANGE_MONTH);
-  source->AddLocalizedString("displayfiltersites", IDS_GROUP_BY_DOMAIN_LABEL);
+  source->AddLocalizedString("rangetoday", IDS_HISTORY_RANGE_TODAY);
   source->AddLocalizedString("numbervisits", IDS_HISTORY_NUMBER_VISITS);
   source->AddBoolean("groupByDomain",
       CommandLine::ForCurrentProcess()->HasSwitch(
@@ -172,6 +172,15 @@ string16 getRelativeDateLocalized(const base::Time& visit_time) {
   return date_str;
 }
 
+// Sets the correct year when substracting months from a date.
+void normalizeMonths(base::Time::Exploded* exploded) {
+  // Decrease a year at a time until we have a proper date.
+  while (exploded->month < 1) {
+    exploded->month += 12;
+    exploded->year--;
+  }
+}
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -267,6 +276,7 @@ void BrowsingHistoryHandler::HandleQueryHistory(const ListValue* args) {
 
   // Parse the arguments from JavaScript. There are four required arguments:
   // - the text to search for (may be empty)
+  // - the offset from which the search should start in multiple of the range.
   // - the range (number) of days to search for, used only for grouped
   //   searches.
   // - the search cursor, an opaque value from a previous query result, which
@@ -275,18 +285,23 @@ void BrowsingHistoryHandler::HandleQueryHistory(const ListValue* args) {
   // - the maximum number of results to return (may be 0, meaning that there
   //   is no maximum).
   string16 search_text = ExtractStringValue(args);
-  int range;
-  if (!args->GetInteger(1, &range)) {
+  int offset;
+  if (!args->GetInteger(1, &offset)) {
     NOTREACHED() << "Failed to convert argument 1. ";
     return;
   }
+  int range;
+  if (!args->GetInteger(2, &range)) {
+    NOTREACHED() << "Failed to convert argument 2. ";
+    return;
+  }
 
   switch (range) {
     case BrowsingHistoryHandler::MONTH:
-      SetQueryTimeInMonths(&options);
+      SetQueryTimeInMonths(offset, &options);
       break;
     case BrowsingHistoryHandler::WEEK:
-      SetQueryTimeInWeeks(&options);
+      SetQueryTimeInWeeks(offset, &options);
       break;
     case BrowsingHistoryHandler::NOT_GROUPED:
       break;
@@ -295,15 +310,15 @@ void BrowsingHistoryHandler::HandleQueryHistory(const ListValue* args) {
   const Value* cursor_value;
 
   // Get the cursor. It must be either null, or a list.
-  if (!args->Get(2, &cursor_value) ||
+  if (!args->Get(3, &cursor_value) ||
       (!cursor_value->IsType(Value::TYPE_NULL) &&
       !history::QueryCursor::FromValue(cursor_value, &options.cursor))) {
-    NOTREACHED() << "Failed to convert argument 2. ";
+    NOTREACHED() << "Failed to convert argument 3. ";
     return;
   }
 
-  if (!ExtractIntegerValueAtIndex(args, 3, &options.max_count)) {
-    NOTREACHED() << "Failed to convert argument 3.";
+  if (!ExtractIntegerValueAtIndex(args, 4, &options.max_count)) {
+    NOTREACHED() << "Failed to convert argument 4.";
     return;
   }
 
@@ -541,28 +556,47 @@ void BrowsingHistoryHandler::RemoveWebHistoryComplete(
 }
 
 void BrowsingHistoryHandler::SetQueryTimeInWeeks(
-    history::QueryOptions* options) {
+    int offset, history::QueryOptions* options) {
   // LocalMidnight returns the beginning of the current day so get the
   // beginning of the next one.
   base::Time midnight = base::Time::Now().LocalMidnight() +
                               base::TimeDelta::FromDays(1);
-  options->end_time = midnight;
-  options->begin_time = midnight - base::TimeDelta::FromDays(7);
+  options->end_time = midnight -
+      base::TimeDelta::FromDays(7 * offset);
+  options->begin_time = midnight -
+      base::TimeDelta::FromDays(7 * (offset + 1));
 }
 
 void BrowsingHistoryHandler::SetQueryTimeInMonths(
-    history::QueryOptions* options) {
+    int offset, history::QueryOptions* options) {
   // Configure the begin point of the search to the start of the
   // current month.
   base::Time::Exploded exploded;
   base::Time::Now().LocalMidnight().LocalExplode(&exploded);
   exploded.day_of_month = 1;
-  options->begin_time = base::Time::FromLocalExploded(exploded);
 
-  // Set the end time of this first search to null (which will
-  // show results from the future, should the user's clock have
-  // been set incorrectly).
-  options->end_time = base::Time();
+  if (offset == 0) {
+    options->begin_time = base::Time::FromLocalExploded(exploded);
+
+    // Set the end time of this first search to null (which will
+    // show results from the future, should the user's clock have
+    // been set incorrectly).
+    options->end_time = base::Time();
+  } else {
+    // Go back |offset| months in the past. The end time is not inclusive, so
+    // use the first day of the |offset| - 1 and |offset| months (e.g. for
+    // the last month, |offset| = 1, use the first days of the last month and
+    // the current month.
+    exploded.month -= offset - 1;
+    // Set the correct year.
+    normalizeMonths(&exploded);
+    options->end_time = base::Time::FromLocalExploded(exploded);
+
+    exploded.month -= 1;
+    // Set the correct year
+    normalizeMonths(&exploded);
+    options->begin_time = base::Time::FromLocalExploded(exploded);
+  }
 }
 
 // Helper function for Observe that determines if there are any differences