// 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.

// Do some basic tests.
couchTests.basics = function(debug) {
    var result = JSON.parse(CouchDB.request("GET", "/").responseText);
    T(result.couchdb == "Welcome"); 

    var db = new CouchDB("test_suite_db");
    db.deleteDb();

    // bug COUCHDB-100: DELETE on non-existent DB returns 500 instead of 404
    db.deleteDb();

    db.createDb();

    // PUT on existing DB should return 412 instead of 500
    xhr = CouchDB.request("PUT", "/test_suite_db/");
    T(xhr.status == 412);
    if (debug) debugger;

    // creating a new DB should return Location header
    xhr = CouchDB.request("DELETE", "/test_suite_db");
    xhr = CouchDB.request("PUT", "/test_suite_db");
    TEquals("/test_suite_db", 
      xhr.getResponseHeader("Location").substr(-14),
      "should return Location header to newly created document");

    TEquals("http://", 
      xhr.getResponseHeader("Location").substr(0, 7),
      "should return absolute Location header to newly created document");

    // Get the database info, check the db_name
    T(db.info().db_name == "test_suite_db");

    // Get the database info, check the doc_count
    T(db.info().doc_count == 0);

    // create a document and save it to the database
    var doc = {_id:"0",a:1,b:1};
    var result = db.save(doc);

    T(result.ok==true); // return object has an ok member with a value true
    T(result.id); // the _id of the document is set.
    T(result.rev); // the revision id of the document is set.

    // Verify the input doc is now set with the doc id and rev
    // (for caller convenience).
    T(doc._id == result.id && doc._rev == result.rev);

    var id = result.id; // save off the id for later

    // make sure the revs_info status is good
    var doc = db.open(id, {revs_info:true});
    T(doc._revs_info[0].status == "available");

    // Create some more documents.
    // Notice the use of the ok member on the return result.
    T(db.save({_id:"1",a:2,b:4}).ok);
    T(db.save({_id:"2",a:3,b:9}).ok);
    T(db.save({_id:"3",a:4,b:16}).ok);

    // Check the database doc count
    T(db.info().doc_count == 4);

    // Test a simple map functions

    // create a map function that selects all documents whose "a" member
    // has a value of 4, and then returns the document's b value.
    var mapFunction = function(doc){
      if (doc.a==4)
        emit(null, doc.b);
    };

    results = db.query(mapFunction);

    // verify only one document found and the result value (doc.b).
    T(results.total_rows == 1 && results.rows[0].value == 16);

    // reopen document we saved earlier
    existingDoc = db.open(id);

    T(existingDoc.a==1);

    //modify and save
    existingDoc.a=4;
    db.save(existingDoc);

    // redo the map query
    results = db.query(mapFunction);

    // the modified document should now be in the results.
    T(results.total_rows == 2);

    // write 2 more documents
    T(db.save({a:3,b:9}).ok);
    T(db.save({a:4,b:16}).ok);

    results = db.query(mapFunction);

    // 1 more document should now be in the result.
    T(results.total_rows == 3);
    T(db.info().doc_count == 6);

    var reduceFunction = function(keys, values){
      return sum(values);
    };

    results = db.query(mapFunction, reduceFunction);

    T(results.rows[0].value == 33);

    // delete a document
    T(db.deleteDoc(existingDoc).ok);

    // make sure we can't open the doc
    T(db.open(existingDoc._id) == null);

    results = db.query(mapFunction);

    // 1 less document should now be in the results.
    T(results.total_rows == 2);
    T(db.info().doc_count == 5);

    // make sure we can still open the old rev of the deleted doc
    T(db.open(existingDoc._id, {rev: existingDoc._rev}) != null);

    // make sure restart works
    T(db.ensureFullCommit().ok);
    restartServer();

    // make sure we can still open
    T(db.open(existingDoc._id, {rev: existingDoc._rev}) != null);

    // test that the POST response has a Location header
    var xhr = CouchDB.request("POST", "/test_suite_db", {
      body: JSON.stringify({"foo":"bar"})
    });
    var resp = JSON.parse(xhr.responseText);
    T(resp.ok);
    var loc = xhr.getResponseHeader("Location");
    T(loc, "should have a Location header");
    var locs = loc.split('/');
    T(locs[4] == resp.id);
    T(locs[3] == "test_suite_db");

    // document put's should return a Location header
    var xhr = CouchDB.request("PUT", "/test_suite_db/newdoc", {
      body: JSON.stringify({"a":1})
    });
    TEquals("/test_suite_db/newdoc", 
      xhr.getResponseHeader("Location").substr(-21),
      "should return Location header to newly created document");

    TEquals("http://", 
      xhr.getResponseHeader("Location").substr(0, 7),
      "should return absolute Location header to newly created document");

    // deleting a non-existent doc should be 404
    xhr = CouchDB.request("DELETE", "/test_suite_db/doc-does-not-exist");
    T(xhr.status == 404);
  };