/*jshint strict: false, unused: false */
/*global TRANSACTION */

////////////////////////////////////////////////////////////////////////////////
/// @brief ArangoDatabase
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2013 triagens 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 triAGENS GmbH, Cologne, Germany
///
/// @author Achim Brandt
/// @author Dr. Frank Celler
/// @author Copyright 2012-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

module.isSystem = true;

var internal = require("internal");



////////////////////////////////////////////////////////////////////////////////
/// @brief constructor
////////////////////////////////////////////////////////////////////////////////

exports.ArangoDatabase = internal.ArangoDatabase;

var ArangoDatabase = exports.ArangoDatabase;

// must called after export
var ArangoCollection = require("@arangodb/arango-collection").ArangoCollection;
var ArangoError = require("@arangodb").ArangoError;
var ArangoStatement = require("@arangodb/arango-statement").ArangoStatement;


////////////////////////////////////////////////////////////////////////////////
/// @brief prints a database
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._PRINT = function (context) {
  context.output += this.toString();
};

////////////////////////////////////////////////////////////////////////////////
/// @brief strng representation of a database
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype.toString = function(seen, path, names, level) {
  return "[ArangoDatabase \"" + this._name() + "\"]";
};


////////////////////////////////////////////////////////////////////////////////
/// @brief factory method to create a new statement
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._createStatement = function (data) {
  return new ArangoStatement(this, data);
};

////////////////////////////////////////////////////////////////////////////////
/// @brief factory method to create and execute a new statement
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._query = function (query, bindVars, cursorOptions, options) {
  if (typeof query === 'object' && query !== null && arguments.length === 1) {
    return new ArangoStatement(this, query).execute();
  }

  var payload = {
    query: query,
    bindVars: bindVars || undefined,
    count: (cursorOptions && cursorOptions.count) || false,
    batchSize: (cursorOptions && cursorOptions.batchSize) || undefined,
    options: options || undefined,
    cache: (options && options.cache) || undefined
  };
  return new ArangoStatement(this, payload).execute();
};

////////////////////////////////////////////////////////////////////////////////
/// @brief explains a query
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._explain = function (query, bindVars, options) {
  if (typeof query === 'object' && typeof query.toAQL === 'function') {
    query = { query: query.toAQL() };
  }

  if (arguments.length > 1) {
    query = { query: query, bindVars: bindVars, options: options };
  }

  require("@arangodb/aql/explainer").explain(query);
};


////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock executeTransaction
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._executeTransaction = function (data) {
  return TRANSACTION(data);
};

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock collectionDatabaseDrop
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._drop = function(name) {
  var collection = name;

  if (! (name instanceof ArangoCollection)) {
    collection = internal.db._collection(name);
  }

  if (collection === null) {
    return;
  }

  try {
    return collection.drop();
  }
  catch (err) {
    // ignore if the collection does not exist
    if (err instanceof ArangoError && 
        err.errorNum === internal.errors.ERROR_ARANGO_COLLECTION_NOT_FOUND.code) {
      return;
    }
    // rethrow exception
    throw err;
  }
};

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock collectionDatabaseTruncate
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._truncate = function(name) {
  var collection = name;

  if (! (name instanceof ArangoCollection)) {
    collection = internal.db._collection(name);
  }

  if (collection === null) {
    return;
  }

  collection.truncate();
};

////////////////////////////////////////////////////////////////////////////////
/// @brief index id regex
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock IndexVerify
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.indexRegex = /^([a-zA-Z0-9\-_]+)\/([0-9]+)$/;

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock IndexHandle
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._index = function(id) {
  if (id.hasOwnProperty("id")) {
    id = id.id;
  }

  var pa = ArangoDatabase.indexRegex.exec(id);
  var err;

  if (pa === null) {
    err = new ArangoError();
    err.errorNum = internal.errors.ERROR_ARANGO_INDEX_HANDLE_BAD.code;
    err.errorMessage = internal.errors.ERROR_ARANGO_INDEX_HANDLE_BAD.message;
    throw err;
  }

  var col = this._collection(pa[1]);

  if (col === null) {
    err = new ArangoError();
    err.errorNum = internal.errors.ERROR_ARANGO_COLLECTION_NOT_FOUND.code;
    err.errorMessage = internal.errors.ERROR_ARANGO_COLLECTION_NOT_FOUND.message;
    throw err;
  }

  var indexes = col.getIndexes();
  var i;

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

    if (index.id === id) {
      return index;
    }
  }

  return null;
};

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock dropIndex
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._dropIndex = function (id) {
  if (id.hasOwnProperty("id")) {
    id = id.id;
  }

  var pa = ArangoDatabase.indexRegex.exec(id);
  var err;

  if (pa === null) {
    err = new ArangoError();
    err.errorNum = internal.errors.ERROR_ARANGO_INDEX_HANDLE_BAD.code;
    err.errorMessage = internal.errors.ERROR_ARANGO_INDEX_HANDLE_BAD.message;
    throw err;
  }

  var col = this._collection(pa[1]);

  if (col === null) {
    err = new ArangoError();
    err.errorNum = internal.errors.ERROR_ARANGO_COLLECTION_NOT_FOUND.code;
    err.errorMessage = internal.errors.ERROR_ARANGO_COLLECTION_NOT_FOUND.message;
    throw err;
  }

  return col.dropIndex(id);
};


////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock endpoints
////////////////////////////////////////////////////////////////////////////////

ArangoDatabase.prototype._endpoints = function () {
  return internal._endpoints();
};