/*
 Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License, version 2.0,
 as published by the Free Software Foundation.

 This program is also distributed with certain software (including
 but not limited to OpenSSL) that is licensed under separate terms,
 as designated in a particular file or component or in included license
 documentation.  The authors of MySQL hereby grant you an additional
 permission to link the program and your derivative works with the
 separately licensed software that they have included with MySQL.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License, version 2.0, for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
 */

'use strict';

var mysql = require('mysql');

var tableHandlers = {
    'a': {
      insertSQL: 'INSERT INTO a(id, cint, clong, cfloat, cdouble) VALUES (?,?,?,?,?)',
      createInsertParameterList: function(object) {
        var result = [];
        result.push(object.id);
        result.push(object.cint);
        result.push(object.clong);
        result.push(object.cfloat);
        result.push(object.cdouble);
        return result;
      },
      deleteSQL: 'DELETE FROM a WHERE id = ?',
      createDeleteParameterList: function(object) {
        if (typeof(object) === 'number') {
          return [object];
        } else if (typeof(object) === 'object') {
          return [object.id];
        } else throw new Error('createFindParameterList parameter must be number or object');
      },
      findSQL: 'SELECT id, cint, clong, cfloat, cdouble FROM a WHERE id = ?',
      createFindParameterList: function(object) {
        if (typeof(object) === 'number') {
          return [object];
        } else if (typeof(object) === 'object') {
          return [object.id];
        } else throw new Error('createFindParameterList parameter must be number or object');
      }
    },
    'b': {
      insertSQL: 'INSERT INTO b(id) VALUES (?)',
      createInsertParameterList: function(object) {
        var result = [];
        result.push(object.id);
          return result;
      },
      deleteSQL: 'DELETE FROM b WHERE id = ?',
      createDeleteParameterList: function(object) {
        if (typeof(object) === 'number') {
          return [object];
        } else if (typeof(object) === 'object') {
          return [object.id];
        } else throw new Error('createFindParameterList parameter must be number or object');
      },
      findSQL: 'SELECT id, cvarbinary_def FROM b WHERE id = ?',
      createFindParameterList: function(object) {
        if (typeof(object) === 'number') {
          return [object];
        } else if (typeof(object) === 'object') {
          return [object.id];
        } else throw new Error('createFindParameterList parameter must be number or object');
      }
    }
};

var implementation = function() {
};

implementation.prototype.getConnectionProperties = function() {
  return {
    mysql_host      : 'localhost',
    mysql_port      : 3306,
    mysql_user      : 'root',
    mysql_password  : '',
    database        : 'test'
  };
};

implementation.prototype.initialize = function(options, callback) {
  JSCRUND.udebug.log_detail('jscrund_sql.initialize', this);
  var properties = {};
  // set up mysql properties
  properties.host = options.properties.mysql_host;
  properties.port = options.properties.mysql_port;
  properties.user = options.properties.mysql_user;
  properties.password = options.properties.mysql_password;
  properties.database = options.properties.database;
  properties.multipleStatements = true;
  JSCRUND.udebug.log_detail('jscrund_sql.initialize calling mysql.createConnection', properties);
  this.inBatchMode = false;
  this.connection = mysql.createConnection(properties);
  this.connection.connect(callback);
};

implementation.prototype.exec = function(statement, values, callback) {
  var v;
  if(this.inBatchMode) {
    this.batchCallbacks.push(callback);
    this.batchQuery += statement + "; ";
    while((v = values.shift()) != undefined) {
      this.batchValues.push(v);
    }
  }
  else {
    this.connection.query(statement, values, callback);
  }

}

implementation.prototype.persist = function(parameters, callback) {
  // which object is it
  var mapping = parameters.object.constructor.prototype.jones.mapping;
  var tableName = mapping.table;
  var object = parameters.object;
  JSCRUND.udebug.log_detail('jscrund_sql implementation.insert object:', object,
      'table', tableName);

  // find the handler for the table
  var tableHandler = tableHandlers[tableName];
  this.exec(tableHandler.insertSQL,
            tableHandler.createInsertParameterList(object),
            callback);
};

implementation.prototype.find = function(parameters, callback) {
  // which object is it
  var mapping = parameters.object.constructor.prototype.jones.mapping;
  var tableName = mapping.table;
  var object = parameters.object;
  JSCRUND.udebug.log_detail('jscrund_sql implementation.find key:', parameters.key, 'table', tableName);

  // find the handler for the table
  var tableHandler = tableHandlers[tableName];
  this.exec(tableHandler.findSQL,
            tableHandler.createFindParameterList(parameters.key),
            callback);
};

implementation.prototype.remove = function(parameters, callback) {
  // which object is it
  var mapping = parameters.object.constructor.prototype.jones.mapping;
  var tableName = mapping.table;
  var object = parameters.object;
  JSCRUND.udebug.log_detail('jscrund_sql implementation.remove key:', parameters.key, 'table', tableName);

  // find the handler for the table
  var tableHandler = tableHandlers[tableName];
  this.exec(tableHandler.deleteSQL,
            tableHandler.createFindParameterList(parameters.key),
            callback);
 };

implementation.prototype.createBatch = function(callback) {
  JSCRUND.udebug.log_detail('jscrund_sql implementation.createBatch');
  this.inBatchMode = true;
  this.batchQuery = "";
  this.batchValues = [];
  this.batchCallbacks = [];
  setImmediate(callback);
};

implementation.prototype.executeBatch = function(callback) {
  JSCRUND.udebug.log_detail('jscrund_sql implementation.executeBatch');
  var callbacks = this.batchCallbacks;
  function allCallbacks(err, results) {
    var n;
    for(n = 0 ; n < callbacks.length ; n++) {
      callbacks[n](err, results[n]);
    }
  }
  this.connection.query(this.batchQuery, this.batchValues, allCallbacks);
  this.inBatchMode = false;
  setImmediate(callback);
};

implementation.prototype.begin = function(callback) {
  JSCRUND.udebug.log_detail('jscrund_sql implementation.begin');
  var impl = this;
  this.connection.query('begin', function(err) {
    if (err) {
      JSCRUND.udebug.log_detail('jscrund_sql implementation.begin callback err:', err);
    } else {
      JSCRUND.udebug.log_detail('jscrund_sql implementation.begin no error');
    }
    callback(err);
  });
};

implementation.prototype.commit = function(callback) {
  JSCRUND.udebug.log_detail('jscrund_sql implementation.commit');
  this.connection.query('commit', function(err) {
    if (err) {
      JSCRUND.udebug.log_detail('jscrund_sql implementation.commit callback err:', err);
    } else {
      JSCRUND.udebug.log_detail('jscrund_sql implementation.commit no error');
    }
    callback(err);
  });
};

implementation.prototype.close = function(callback) {
  JSCRUND.udebug.log_detail('jscrund_sql implementation.close');
  this.connection.end(function(err) {
    callback(err);
  });
};

exports.implementation = implementation;