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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License.  You may obtain a copy
// of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
// License for the specific language governing permissions and limitations under
// the License.

couchTests.rev_stemming = function(debug) {
  var db = new CouchDB("test_suite_db_a");
  db.deleteDb();
  db.createDb();
  var dbB = new CouchDB("test_suite_db_b");
  dbB.deleteDb();
  dbB.createDb();
  if (debug) debugger;
  
  var newLimit = 5;
  
  T(db.getDbProperty("_revs_limit") == 1000);
  
  var doc = {_id:"foo",foo:0}
  for( var i=0; i < newLimit + 1; i++) {
    doc.foo++;
    T(db.save(doc).ok);
  }
  var doc0 = db.open("foo", {revs:true});
  T(doc0._revisions.ids.length == newLimit + 1);
  
  var docBar = {_id:"bar",foo:0}
  for( var i=0; i < newLimit + 1; i++) {
    docBar.foo++;
    T(db.save(docBar).ok);
  }
  T(db.open("bar", {revs:true})._revisions.ids.length == newLimit + 1);
  
  T(db.setDbProperty("_revs_limit", newLimit).ok);
  
  for( var i=0; i < newLimit + 1; i++) {
    doc.foo++;
    T(db.save(doc).ok);
  }
  doc0 = db.open("foo", {revs:true});
  T(doc0._revisions.ids.length == newLimit);
  
  
  // If you replicate after you make more edits than the limit, you'll
  // cause a spurious edit conflict.
  CouchDB.replicate("test_suite_db_a", "test_suite_db_b");
  var docB1 = dbB.open("foo",{conflicts:true})
  T(docB1._conflicts == null);
  
  for( var i=0; i < newLimit - 1; i++) {
    doc.foo++;
    T(db.save(doc).ok);
  }

  // one less edit than limit, no conflict
  CouchDB.replicate("test_suite_db_a", "test_suite_db_b");
  var docB1 = dbB.open("foo",{conflicts:true})
  T(docB1._conflicts == null);

  //now we hit the limit
  for( var i=0; i < newLimit; i++) {
    doc.foo++;
    T(db.save(doc).ok);
  }
  
  CouchDB.replicate("test_suite_db_a", "test_suite_db_b");
  
  var docB2 = dbB.open("foo",{conflicts:true});
  
  // we have a conflict, but the previous replicated rev is always the losing
  // conflict
  T(docB2._conflicts[0] == docB1._rev)
  
  // We having already updated bar before setting the limit, so it's still got
  // a long rev history. compact to stem the revs.
  
  T(db.open("bar", {revs:true})._revisions.ids.length == newLimit + 1);
  
  T(db.compact().ok);
  
  // compaction isn't instantaneous, loop until done
  while (db.info().compact_running) {};
  
  T(db.open("bar", {revs:true})._revisions.ids.length == newLimit);
  
};