/*jshint strict: false */

////////////////////////////////////////////////////////////////////////////////
/// @brief querying and managing indexes
///
/// @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 Achim Brandt
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2012, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

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

var API = "_api/index";


////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_get_api_index
////////////////////////////////////////////////////////////////////////////////

function get_api_indexes (req, res) {
  var name = req.parameters.collection;
  var collection = arangodb.db._collection(name);

  if (collection === null) {
    actions.collectionNotFound(req, res, name);
    return;
  }

  var list = [], ids = {}, indexes = collection.getIndexes(), i;

  for (i = 0;  i < indexes.length;  ++i) {
    var index = indexes[i];

    list.push(index);
    ids[index.id] = index;
  }

  var result = { indexes : list, identifiers : ids };

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

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_get_api_reads_index
////////////////////////////////////////////////////////////////////////////////

function get_api_index (req, res) {

  // .............................................................................
  // /_api/index?collection=<collection-name>
  // .............................................................................

  if (req.suffix.length === 0) {
    get_api_indexes(req, res);
  }

  // .............................................................................
  // /_api/index/<collection-name>/<index-identifier>
  // .............................................................................

  else if (req.suffix.length === 2) {
    var name = decodeURIComponent(req.suffix[0]);
    var collection = arangodb.db._collection(name);

    if (collection === null) {
      actions.collectionNotFound(req, res, name);
      return;
    }

    var iid = decodeURIComponent(req.suffix[1]);
    try {
      var index = collection.index(name + "/" + iid);
      if (index !== null) {
        actions.resultOk(req, res, actions.HTTP_OK, index);
        return;
      }
    }
    catch (err) {
      if (err.errorNum === arangodb.ERROR_ARANGO_INDEX_NOT_FOUND ||
          err.errorNum === arangodb.ERROR_ARANGO_COLLECTION_NOT_FOUND) {
        actions.indexNotFound(req, res, collection, iid);
        return;
      }
      throw err;
    }
  }
  else {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER,
                      "expect GET /" + API + "/<index-handle>");
  }
}

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_post_api_index_cap
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_post_api_index_geo
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_post_api_index_hash
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_post_api_index_skiplist
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_post_api_index_fulltext
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_post_api_index
////////////////////////////////////////////////////////////////////////////////

function post_api_index (req, res) {
  if (req.suffix.length !== 0) {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER,
                      "expecting POST /" + API + "?collection=<collection-name>");
    return;
  }

  var name = req.parameters.collection;
  var collection = arangodb.db._collection(name);

  if (collection === null) {
    actions.collectionNotFound(req, res, name);
    return;
  }

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

  if (body === undefined) {
    return;
  }

  // inject collection name into body
  if (body.collection === undefined) {
    body.collection = name;
  }

  // create the index
  var index = collection.ensureIndex(body);
  actions.resultOk(req, res, index.isNewlyCreated ? actions.HTTP_CREATED : actions.HTTP_OK, index);
}

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_post_api_index_delete
////////////////////////////////////////////////////////////////////////////////

function delete_api_index (req, res) {
  if (req.suffix.length !== 2) {
    actions.resultBad(req, res, arangodb.ERROR_HTTP_BAD_PARAMETER,
                      "expect DELETE /" + API + "/<index-handle>");
    return;
  }

  var name = decodeURIComponent(req.suffix[0]);
  var collection = arangodb.db._collection(name);

  if (collection === null) {
    actions.collectionNotFound(req, res, name);
    return;
  }

  var iid = parseInt(decodeURIComponent(req.suffix[1]), 10);
  var dropped = collection.dropIndex(name + "/" + iid);

  if (dropped) {
    actions.resultOk(req, res, actions.HTTP_OK, { id : name + "/" + iid });
  }
  else {
    actions.indexNotFound(req, res, collection, name + "/" + iid);
  }
}

////////////////////////////////////////////////////////////////////////////////
/// @brief reads or creates an index
////////////////////////////////////////////////////////////////////////////////

actions.defineHttp({
  url : API,

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