/*jslint indent: 2,
         nomen: true,
         maxlen: 100,
         sloppy: true,
         vars: true,
         white: true,
         plusplus: true */
/*global require, db, edges, Module,
  ArangoCollection, ArangoDatabase,
  ArangoError, ShapedJson,
  SYS_DEFINE_ACTION */

////////////////////////////////////////////////////////////////////////////////
/// @brief JavaScript server functions
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2011-2012 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 Dr. Frank Celler
/// @author Copyright 2011-2012, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

// -----------------------------------------------------------------------------
// --SECTION--                                                 Module "internal"
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8ModuleInternal
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief internal module
////////////////////////////////////////////////////////////////////////////////

(function () {
  var internal = require("internal");
  var console = require("console");

  internal.reloadAuth = RELOAD_AUTH;

  internal.db = db;
  internal.edges = db;
  internal.ArangoCollection = ArangoCollection;
  internal.ArangoDatabase = ArangoDatabase;
  internal.ArangoError = ArangoError;

  if (typeof SYS_DEFINE_ACTION === "undefined") {
    internal.defineAction = function() {
      console.error("SYS_DEFINE_ACTION not available");
    };

    internal.actionLoaded = function() {
    }
  }
  else {
    internal.defineAction = SYS_DEFINE_ACTION;

    internal.actionLoaded = function() {
      var modules;
      var i;
      
      console.debug("actions loaded");
      
      modules = internal.db._collection("_modules");

      if (modules !== null) {
	modules = modules.byExample({ autoload: true }).toArray();

	for (i = 0;  i < modules.length;  ++i) {
	  var module = modules[i];

	  console.debug("autoloading module: %s", module.path);

	  try {
	    require(module.path);
	  }
	  catch (err) {
	    console.error("while loading '%s': %s", module.path, String(err));
	  }
	}
      }
    }
  }

  if (typeof SYS_EXECUTE_GLOBAL_CONTEXT_FUNCTION === "undefined") {
    internal.executeGlobalContextFunction = function() {
      console.error("SYS_EXECUTE_GLOBAL_CONTEXT_FUNCTION not available");
    };
  }
  else {
    internal.executeGlobalContextFunction = SYS_EXECUTE_GLOBAL_CONTEXT_FUNCTION;
  }

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

// -----------------------------------------------------------------------------
// --SECTION--                                             Module "simple-query"
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8ModuleSimpleQuery
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief simple-query module
////////////////////////////////////////////////////////////////////////////////

  try {
    require("simple-query");
  }
  catch (err) {
    console.error("while loading 'simple-query' module: %s", err);
  }

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

// -----------------------------------------------------------------------------
// --SECTION--                                                        ShapedJson
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8Shell
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief prints a shaped json
////////////////////////////////////////////////////////////////////////////////

  ShapedJson.prototype._PRINT = function(seen, path, names, level) {
    if (this instanceof ShapedJson) {
      internal.printObject(this, seen, path, names, level);
    }
    else {
      internal.output(this.toString());
    }
  };

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

// -----------------------------------------------------------------------------
// --SECTION--                                                       ArangoError
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8Shell
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief prints an error
////////////////////////////////////////////////////////////////////////////////

  ArangoError.prototype._PRINT = function() {
    var errorNum = this.errorNum;
    var errorMessage = this.errorMessage;

    internal.output("[ArangoError ", errorNum, ": ", errorMessage, "]");
  };

////////////////////////////////////////////////////////////////////////////////
/// @brief converts error to string
////////////////////////////////////////////////////////////////////////////////

  ArangoError.prototype.toString = function() {
    var errorNum = this.errorNum;
    var errorMessage = this.errorMessage;

    return "[ArangoError " + errorNum + ": " + errorMessage + "]";
  };

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

// -----------------------------------------------------------------------------
// --SECTION--                                                    ArangoDatabase
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8Shell
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @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 (data) {  
    return new ArangoStatement(this, { query: data }).execute();
  };

////////////////////////////////////////////////////////////////////////////////
/// @brief drops a collection
///
/// @FUN{db._drop(@FA{collection})}
///
/// Drops a @FA{collection} and all its indexes.
///
/// @FUN{db._drop(@FA{collection-identifier})}
///
/// Drops a collection identified by @FA{collection-identifier} and all its
/// indexes. No error is thrown if there is no such collection.
///
/// @FUN{db._drop(@FA{collection-name})}
///
/// Drops a collection named @FA{collection-name} and all its indexes. No error
/// is thrown if there is no such collection.
///
/// @EXAMPLES
///
/// Drops a collection:
///
/// @verbinclude shell_collection-drop-db
///
/// Drops a collection identified by name:
///
/// @verbinclude shell_collection-drop-name-db
////////////////////////////////////////////////////////////////////////////////

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

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

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

    return collection.drop();
  };

////////////////////////////////////////////////////////////////////////////////
/// @brief truncates a collection
///
/// @FUN{db._truncate(@FA{collection})}
///
/// Truncates a @FA{collection}, removing all documents but keeping all its
/// indexes.
///
/// @FUN{db._truncate(@FA{collection-identifier})}
///
/// Truncates a collection identified by @FA{collection-identified}. No error is
/// thrown if there is no such collection.
///
/// @FUN{db._truncate(@FA{collection-name})}
///
/// Truncates a collection named @FA{collection-name}. No error is thrown if
/// there is no such collection.
///
/// @EXAMPLES
///
/// Truncates a collection:
///
/// @verbinclude shell_collection-truncate-db
///
/// Truncates a collection identified by name:
///
/// @verbinclude shell_collection-truncate-name-db
////////////////////////////////////////////////////////////////////////////////

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

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

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

    collection.truncate();
  };

////////////////////////////////////////////////////////////////////////////////
/// @brief finds an index
///
/// @FUN{db._index(@FA{index-handle})}
///
/// Returns the index with @FA{index-handle} or null if no such index exists.
///
/// @EXAMPLES
///
/// @verbinclude shell_index-read-db
////////////////////////////////////////////////////////////////////////////////

  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 drops an index
///
/// @FUN{db._dropIndex(@FA{index})}
///
/// Drops the @FA{index}.  If the index does not exists, then @LIT{false} is
/// returned. If the index existed and was dropped, then @LIT{true} is
/// returned. Note that you cannot drop the primary index.
///
/// @FUN{db._dropIndex(@FA{index-handle})}
///
/// Drops the index with @FA{index-handle}.
///
/// @EXAMPLES
///
/// @verbinclude shell_index-drop-index-db
////////////////////////////////////////////////////////////////////////////////

  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 prints a database
////////////////////////////////////////////////////////////////////////////////

    ArangoDatabase.prototype._PRINT = function(seen, path, names, level) {
      internal.output("[ArangoDatabase \"" + this._path + "\"]");
    };

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

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

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

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

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

// -----------------------------------------------------------------------------
// --SECTION--                                                   ArangoStatement
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8Shell
/// @{
////////////////////////////////////////////////////////////////////////////////
  
  try {
    var SQ = require("simple-query-basics");
    var SB = require("statement-basics");
    internal.ArangoStatement = SB.ArangoStatement;
    ArangoStatement = SB.ArangoStatement;
  }
  catch (err) {
    console.error("while loading 'statement-basics' module: %s", err);
  }
  
////////////////////////////////////////////////////////////////////////////////
/// @brief parse a query and return the results
////////////////////////////////////////////////////////////////////////////////

  SB.ArangoStatement.prototype.parse = function () {
    var result = AHUACATL_PARSE(this._query); 

    return { "bindVars" : result.parameters, "collections" : result.collections };
  };

////////////////////////////////////////////////////////////////////////////////
/// @brief explain a query and return the results
////////////////////////////////////////////////////////////////////////////////

  SB.ArangoStatement.prototype.explain = function () {
    return AHUACATL_EXPLAIN(this._query); 
  };

////////////////////////////////////////////////////////////////////////////////
/// @brief execute the query
///
/// This will return a cursor with the query results in case of success.
////////////////////////////////////////////////////////////////////////////////

  SB.ArangoStatement.prototype.execute = function () {
    var result = AHUACATL_RUN(this._query, 
                              this._bindVars, 
                              this._doCount != undefined ? this._doCount : false, 
                              null, 
                              true);  
    return new SQ.GeneralArrayCursor(result, 0, null);
  };

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

}());

// -----------------------------------------------------------------------------
// --SECTION--                                                       END-OF-FILE
// -----------------------------------------------------------------------------

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