/*jshint strict: false */
/*global ArangoAgency */

////////////////////////////////////////////////////////////////////////////////
/// @brief database management
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Jan Steemann
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

var arangodb = require("@arangodb");
var actions = require("@arangodb/actions");
var cluster = require("@arangodb/cluster");

var API = "_api/database";


////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_get_api_database_list
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_get_api_database_user
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_get_api_database_current
////////////////////////////////////////////////////////////////////////////////

function get_api_database (req, res) {
  if (req.suffix.length > 1) {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
    return;
  }

  var result;
  if (req.suffix.length === 0) {
    // list of all databases
    result = arangodb.db._databases();
  }
  else {
    if (req.suffix[0] === 'user') {
      // fetch all databases for the current user
      // note: req.user may be null if authentication is turned off
      result = arangodb.db._databases(req.user);
    }
    else if (req.suffix[0] === 'current') {
      if (cluster.isCoordinator()) {
        // fetch database information from Agency
        var values = ArangoAgency.get("Plan/Databases/" + encodeURIComponent(req.database), false);
        var dbEntry = values.arango.Plan.Databases[encodeURIComponent(req.database)];
        result = {
          name: dbEntry.name,
          id: dbEntry.id,
          path: "none",
          isSystem: (dbEntry.name.substr(0, 1) === '_')
        };
      }
      else {
        // information about the current database
        result = {
          name: arangodb.db._name(),
          id: arangodb.db._id(),
          path: arangodb.db._path(),
          isSystem: arangodb.db._isSystem()
        };
      }
    }
    else {
      actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
      return;
    }
  }

  actions.resultOk(req, res, actions.HTTP_OK, { result : result });
}

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_get_api_database_new
////////////////////////////////////////////////////////////////////////////////

function post_api_database (req, res) {
  if (req.suffix.length !== 0) {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
    return;
  }

  var json = actions.getJsonBody(req, res);

  if (json === undefined) {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
    return;
  }

  var options = json.options;

  if (options === undefined) {
    options = { };
  }

  if (typeof options !== 'object') {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
    return;
  }

  var users = json.users;

  if (users === undefined || users === null) {
    users = [ ];
  }
  else if (! Array.isArray(users)) {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
    return;
  }

  var i;
  for (i = 0; i < users.length; ++i) {
    var user = users[i];
    if (typeof user !== 'object' ||
        ! user.hasOwnProperty('username') ||
        typeof(user.username) !== 'string') {
      // bad username
      actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
      return;
    }

    if (! user.hasOwnProperty('passwd')) {
      // default to empty string
      users[i].passwd = '';
    }
    else if (typeof(user.passwd) !== 'string') {
      // bad password type
      actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
      return;
    }

    if (! user.hasOwnProperty('active')) {
      users[i].active = true;
    }
  }

  var result = arangodb.db._createDatabase(json.name || "", options, users);

  actions.resultOk(req, res, actions.HTTP_CREATED, { result : result });
}

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_get_api_database_delete
////////////////////////////////////////////////////////////////////////////////

function delete_api_database (req, res) {
  if (req.suffix.length !== 1) {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER);
    return;
  }

  var result = arangodb.db._dropDatabase(req.suffix[0]);

  actions.resultOk(req, res, actions.HTTP_OK, { result : result });
}

////////////////////////////////////////////////////////////////////////////////
/// @brief handles a database request
////////////////////////////////////////////////////////////////////////////////

actions.defineHttp({
  url : API,

  callback : function (req, res) {
    try {
      if (req.requestType === actions.GET) {
        get_api_database(req, res);
      }
      else if (req.requestType === actions.POST) {
        post_api_database(req, res);
      }
      else if (req.requestType === actions.DELETE) {
        delete_api_database(req, res);
      }
      else {
        actions.resultUnsupported(req, res);
      }
    }
    catch (err) {
      actions.resultException(req, res, err, undefined, false);
    }
  }
});