<?php
// Copyright (C) 2011-2012 Combodo SARL
//
//   This file is part of iTop.
//
//   iTop is free software; you can redistribute it and/or modify	
//   it under the terms of the GNU Affero General Public License as published by
//   the Free Software Foundation, either version 3 of the License, or
//   (at your option) any later version.
//
//   iTop 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 Affero General Public License for more details.
//
//   You should have received a copy of the GNU Affero General Public License
//   along with iTop. If not, see <http://www.gnu.org/licenses/>

/**
 * Data Exchange web service 
 *
 * @copyright   Copyright (C) 2010-2012 Combodo SARL
 * @license     http://opensource.org/licenses/AGPL-3.0
 */

//
// Known limitations
// - reconciliation is made on the column primary_key
//

if (!defined('__DIR__')) define('__DIR__', dirname(__FILE__));
require_once(__DIR__.'/../approot.inc.php');
require_once(APPROOT.'/application/application.inc.php');
require_once(APPROOT.'/application/webpage.class.inc.php');
require_once(APPROOT.'/application/csvpage.class.inc.php');
require_once(APPROOT.'/application/clipage.class.inc.php');

require_once(APPROOT.'/application/startup.inc.php');

class ExchangeException extends Exception
{
}

$aPageParams = array
(
	'auth_user' => array
	(
		'mandatory' => true,
		'modes' => 'cli',
		'default' => null,
		'description' => 'login (must have enough rights to create objects of the given class)',
	),
	'auth_pwd' => array
	(
		'mandatory' => true,
		'modes' => 'cli',
		'default' => null,
		'description' => 'password',
	),
	'data_source_id' => array
	(
		'mandatory' => true,
		'modes' => 'http,cli',
		'default' => null,
		'description' => 'Synchro data source id',
	),
	'csvdata' => array
	(
		'mandatory' => true,
		'modes' => 'http',
		'default' => null,
		'description' => 'data',
	),
	'csvfile' => array
	(
		'mandatory' => true,
		'modes' => 'cli',
		'default' => '',
		'description' => 'local data file, replaces csvdata if specified',
	),
	'synchronize' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => '1',
		'description' => 'If set to 1, then the synchronization will be executed right after the data load',
	),
	'charset' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => 'UTF-8',
		'description' => 'Character set encoding of the CSV data: UTF-8, ISO-8859-1, WINDOWS-1251, WINDOWS-1252, ISO-8859-15',
	),
	'date_format' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => '',
		'description' => 'Input date format (used both for dates and datetimes) - Examples: Y-m-d, d/m/Y (Europe) - no transformation is applied if the argument is omitted. (note: old format specification using %Y %m %d is also supported for backward compatibility)',
	),
	'separator' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => ';',
		'description' => 'column separator in CSV data (1 char, or \'tab\')',
	),
	'qualifier' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => '"',
		'description' => 'test qualifier in CSV data',
	),
	'output' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => 'summary',
		'description' => '[retcode] to return the count of lines in error, [summary] to return a concise report, [details] to get a detailed report (each line listed)',
	),
	'max_chunk_size' => array
	(
		'mandatory' => false,
		'modes' => 'cli',
		'default' => '0',
		'description' => 'Limit on the count of records that can be loaded at once while performing the synchronization',
	),
/*
	'reportlevel' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => 'errors|warnings|created|changed|unchanged',
		'description' => 'combination of flags to limit the detailed output',
	),
*/
	'simulate' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => '0',
		'description' => 'If set to 1, then the load will not be executed, but the expected report will be produced',
	),
	'comment' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => '',
		'description' => 'Comment to be added into the change log',
	),
	'no_stop_on_import_error' => array
	(
		'mandatory' => false,
		'modes' => 'http,cli',
		'default' => '0',
		'description' => 'Don\'t stop the import in case of SQL import error. By default the import will stop at the first error (and rollback all changes). If this flag is set to 1 the import will continue anyway',
	),
);

function UsageAndExit($oP)
{
	global $aPageParams;
	$bModeCLI = utils::IsModeCLI();

	$oP->p("USAGE:\n");
	foreach($aPageParams as $sParam => $aParamData)
	{
		$aModes = explode(',', $aParamData['modes']);
		if ($bModeCLI)
		{
			if (in_array('cli', $aModes))
			{
				$sDesc = $aParamData['description'].', '.($aParamData['mandatory'] ? 'mandatory' : 'optional, defaults to ['.$aParamData['default'].']');
				$oP->p("$sParam = $sDesc");
			}
		}
		else
		{
			if (in_array('http', $aModes))
			{
				$sDesc = $aParamData['description'].', '.($aParamData['mandatory'] ? 'mandatory' : 'optional, defaults to ['.$aParamData['default'].']');
				$oP->p("$sParam = $sDesc");
			}
		}
	}
	$oP->output();
	exit;
}


function ReadParam($oP, $sParam, $sSanitizationFilter = 'parameter')
{
	global $aPageParams;
	assert(isset($aPageParams[$sParam]));
	assert(!$aPageParams[$sParam]['mandatory']);
	$sValue = utils::ReadParam($sParam, $aPageParams[$sParam]['default'], true /* Allow CLI */, $sSanitizationFilter);
	return trim($sValue);
}

function ReadMandatoryParam($oP, $sParam, $sSanitizationFilter)
{
	global $aPageParams;
	assert(isset($aPageParams[$sParam]));
	assert($aPageParams[$sParam]['mandatory']);

	$sValue = utils::ReadParam($sParam, null, true /* Allow CLI */, $sSanitizationFilter);
	if (is_null($sValue))
	{
		$oP->p("ERROR: Missing argument '$sParam'\n");
		UsageAndExit($oP);
	}
	return trim($sValue);
}

function ChangeDateFormat($sProposedDate, $sDateFormat)
{
	// Make sure this is a valid MySQL datetime
	$oDate = DateTime::createFromFormat($sDateFormat, $sProposedDate);
	if ($oDate !== false)
	{
		$sDate = $oDate->format(AttributeDateTime::GetInternalFormat());
		return $sDate;
	}
	else
	{
		return false;
	}
}


class CLILikeWebPage extends WebPage
{
	public function add_comment($sText)
	{
		$this->add('#'.$sText."<br/>\n");
	}
}

/////////////////////////////////
// Main program

if (utils::IsModeCLI())
{
	$oP = new CLIPage(Dict::S("TitleSynchroExecution"));
}
else
{
	$oP = new CLILikeWebPage(Dict::S("TitleSynchroExecution"));
}

try
{
	utils::UseParamFile();
}
catch(Exception $e)
{
	$oP->p("Error: ".$e->GetMessage());
	$oP->output();
	exit -2;
}

if (utils::IsModeCLI())
{
	// Next steps:
	//   specific arguments: 'csvfile'
	//   
	$sAuthUser = ReadMandatoryParam($oP, 'auth_user', 'raw_data');
	$sAuthPwd = ReadMandatoryParam($oP, 'auth_pwd', 'raw_data');
	$sCsvFile = ReadMandatoryParam($oP, 'csvfile', 'raw_data');
	if (UserRights::CheckCredentials($sAuthUser, $sAuthPwd))
	{
		UserRights::Login($sAuthUser); // Login & set the user's language
	}
	else
	{
		$oP->p("Access restricted or wrong credentials ('$sAuthUser')");
		$oP->output();
		exit -1;
	}

	if (!is_readable($sCsvFile))
	{
		$oP->p("Input file could not be found or could not be read: '$sCsvFile'");
		$oP->output();
		exit -1;
	}
	$sCSVData = file_get_contents($sCsvFile);

}
else
{
	$_SESSION['login_mode'] = 'basic';
	require_once(APPROOT.'/application/loginwebpage.class.inc.php');
	LoginWebPage::DoLogin(); // Check user rights and prompt if needed

	$sCSVData = utils::ReadPostedParam('csvdata', '', false, 'raw_data');
}


try
{
	//////////////////////////////////////////////////
	//
	// Read parameters
	//
	$iDataSourceId = ReadMandatoryParam($oP, 'data_source_id', 'raw_data');
	$sSynchronize = ReadParam($oP, 'synchronize');
	$sSep = ReadParam($oP, 'separator', 'raw_data');
	$sQualifier = ReadParam($oP, 'qualifier', 'raw_data');
	$sCharSet = ReadParam($oP, 'charset', 'raw_data');
	$sDateFormat = ReadParam($oP, 'date_format', 'raw_data');
	if (strpos($sDateFormat, '%') !== false)
	{
		$sDateFormat = utils::DateTimeFormatToPHP($sDateFormat);
	}
	$sOutput = ReadParam($oP, 'output');
//	$sReportLevel = ReadParam($oP, 'reportlevel');
	$sSimulate = ReadParam($oP, 'simulate');
	$sComment = ReadParam($oP, 'comment', 'raw_data');
	$sNoStopOnImportError = ReadParam($oP, 'no_stop_on_import_error');

	if (strtolower(trim($sSep)) == 'tab')
	{
		$sSep = "\t";
	}

	$oLoadStartDate = new DateTime(); // Now

   // Note about date formatting: These MySQL settings are read-only... and in fact unused :-(
	// SET SESSION date_format = '%d/%m/%Y';
   // SET SESSION datetime_format = '%d/%m/%Y %H:%i:%s';
   // Therefore, we have to allow users to transform the format according to a given specification: date_format


	//////////////////////////////////////////////////
	//
	// Statistics
	//
	$iCountErrors = 0;
	$iCountCreations = 0;
	$iCountUpdates = 0;

	//////////////////////////////////////////////////
	//
	// Check parameters format/consistency
	//
	if (strlen($sCSVData) == 0)
	{
		throw new ExchangeException("Missing data - at least one line is expected");
	}

	$oDataSource = MetaModel::GetObject('SynchroDataSource', $iDataSourceId, false);
	if (is_null($oDataSource))
	{
		throw new ExchangeException("Unknown data source id: '$iDataSourceId'");
	}
	$sClass = $oDataSource->GetTargetClass();

	if (strlen($sSep) > 1)
	{
		throw new ExchangeException("Separator is limited to one character, found '$sSep'");
	}

	if (strlen($sQualifier) > 1)
	{
		throw new ExchangeException("Text qualifier is limited to one character, found '$sQualifier'");
	}

	if (!in_array($sOutput, array('retcode', 'summary', 'details')))
	{
		throw new ExchangeException("Unknown output format: '$sOutput'");
	}

/*
	$aReportLevels = explode('|', $sReportLevel);
	foreach($aReportLevels as $sLevel)
	{
		if (!in_array($sLevel, explode('|', 'errors|warnings|created|changed|unchanged')))
		{
			throw new ExchangeException("Unknown level in reporting level: '$sLevel'");
		}
	}
*/

	if ($sSimulate == '1')
	{
		$bSimulate = true;
	}
	else
	{
		$bSimulate = false;
	}

	if ($sSynchronize == '1')
	{
		$bSynchronize = true;
	}
	else
	{
		$bSynchronize = false;
	}

	//////////////////////////////////////////////////
	//
	// Parse first line, check attributes, analyse the request
	//
	if ($sCharSet == 'UTF-8')
	{
		$sUTF8Data = $sCSVData;		
	}
	else
	{
		$sUTF8Data = iconv($sCharSet, 'UTF-8//IGNORE//TRANSLIT', $sCSVData);
	}
	$oCSVParser = new CSVParser($sUTF8Data, $sSep, $sQualifier); 

	$aInputColumns = $oCSVParser->ListFields();
	$iColCount = count($aInputColumns);

	// Check columns
	$aColumns = $oDataSource->GetSQLColumns();
	$aDateColumns = $oDataSource->GetDateSQLColumns();
	$aIsDateToTransform = array();
	$aDateToTransformReport = array();
	foreach($aInputColumns as $iFieldId => $sInputColumn)
	{
		if ((strlen($sDateFormat) > 0) && (array_key_exists($sInputColumn, $aDateColumns)))
		{
			$aIsDateToTransform[$iFieldId] = true;
			$aDateToTransformReport[] = $sInputColumn;
		}
		else
		{
			$aIsDateToTransform[$iFieldId] = false;
		}

		if ($sInputColumn == 'primary_key')
		{
			$iPrimaryKeyCol = $iFieldId;
			continue;
		}
		if (!array_key_exists($sInputColumn, $aColumns))
		{
			throw new ExchangeException("Unknown column '$sInputColumn' (class: '$sClass')");
		}
	}
	if (!isset($iPrimaryKeyCol))
	{
		throw new ExchangeException("Missing reconciliation column 'primary_key'");
	}

	//////////////////////////////////////////////////
	//
	// Go for parsing and interpretation
	//
	try
	{
		$oP->add_comment('Load--------------');
		$oP->add_comment('------------------');

		if ($bSimulate)
		{
			CMDBSource::Query('START TRANSACTION');
		}
		$aData = $oCSVParser->ToArray();
		$iLineCount = count($aData);
	
		$sTable = $oDataSource->GetDataTable();
	
	   // Prepare insert columns
		$sInsertColumns = '`'.implode('`, `', $aInputColumns).'`';
	
		$oMutex = new iTopMutex('synchro_import_'.$oDataSource->GetKey());
		$oMutex->Lock();
		foreach($aData as $iRow => $aRow)
	  	{
	      $sReconciliationCondition = "`primary_key` = ".CMDBSource::Quote($aRow[$iPrimaryKeyCol]);
			$sSelect = "SELECT COUNT(*) FROM `$sTable` WHERE $sReconciliationCondition"; 
			$aRes = CMDBSource::QueryToArray($sSelect);
			$iCount = $aRes[0]['COUNT(*)'];
	
			if ($iCount == 0)
			{
				// No record... create it
				//
				$iCountCreations++;
				if ($sOutput == 'details')
				{
					$oP->add("$iRow: New entry, reconciliation: '$sReconciliationCondition'\n");
				}
	
				$aValues = array(); // Used to build the insert query
				foreach ($aRow as $iCol => $value)
				{
					if (is_null($value))
					{
						$aValues[] = 'NULL';
					}
					elseif ($aIsDateToTransform[$iCol])
					{
						$sDate = ChangeDateFormat($value, $sDateFormat);
						if ($sDate === false)
						{
							$aValues[] = CMDBSource::Quote('');
							if ($sOutput == 'details')
							{
								$oP->add("$iRow: Wrong format for date field: '$value' (skipped column)\n");
							}
						}
						else
						{
							$aValues[] = CMDBSource::Quote($sDate);
						}
					}
					else
					{
						$aValues[] = CMDBSource::Quote($value);
					}
				}
				$sValues = implode(', ', $aValues);
				$sInsert = "INSERT INTO `$sTable` ($sInsertColumns) VALUES ($sValues)";
				try
				{
					CMDBSource::Query($sInsert);
				}
				catch(Exception $e)
				{
					if ($sNoStopOnImportError == '1')
					{
						$iCountErrors++;
						$oP->add("$iRow: Import error '".$e->getMessage()."' (continuing)...\n");
					}
					else // Fatal error
					{
						throw $e;
					}
				}
			}
			elseif ($iCount == 1)
			{
				// Found a match... update it
				//
				$iCountUpdates++;
				if ($sOutput == 'details')
				{
					$oP->add("$iRow: Update entry, reconciliation: '$sReconciliationCondition'\n");
				}
	
				$aValuePairs = array(); // Used to build the update query
				foreach ($aRow as $iCol => $value)
				{
					// Skip reconciliation column
					if ($iCol == $iPrimaryKeyCol) continue;
		
					$sCol = $aInputColumns[$iCol];
					if ($aIsDateToTransform[$iCol])
					{
						$sDate = ChangeDateFormat($aRow[$iCol], $sDateFormat);
						if ($sDate === false)
						{
							// Skip this column spec
							if ($sOutput == 'details')
							{
								$oP->add("$iRow: Wrong format for date field: '".$aRow[$iCol]."' (skipped column)\n");
							}
						}
						else
						{
							$aValuePairs[] = "`$sCol` = ".CMDBSource::Quote($sDate);
						}
					}
					else
					{
						$aValuePairs[] = "`$sCol` = ".CMDBSource::Quote($aRow[$iCol]);
					}
				}
				$sValuePairs = implode(', ', $aValuePairs);
				$sUpdateQuery = "UPDATE `$sTable` SET $sValuePairs WHERE $sReconciliationCondition";
				try
				{
					CMDBSource::Query($sUpdateQuery);
				}
				catch(Exception $e)
				{
					if ($sNoStopOnImportError == '1')
					{
						$iCountErrors++;
						$oP->add("$iRow: Import error '".$e->getMessage()."' (continuing)...\n");
					}
					else // Fatal error
					{
						throw $e;
					}
				}
			}
			else
			{
				// Too many records... ambiguity
				//
				$iCountErrors++;
				$oP->add("$iRow: Error - Failed to reconcile, found $iCount rows having '$sReconciliationCondition'\n");
			}
		}
		$oMutex->Unlock();
		
		if (($sOutput == "summary") || ($sOutput == 'details'))
		{
			$oP->add_comment("Data Source: ".$iDataSourceId);
			$oP->add_comment("Synchronize: ".($bSynchronize ? '1' : '0'));
			$oP->add_comment("Class: ".$sClass);
			$oP->add_comment("Separator: ".$sSep);
			$oP->add_comment("Qualifier: ".$sQualifier);
			$oP->add_comment("Charset Encoding:".$sCharSet);
			if (strlen($sDateFormat) > 0)
			{
				$oP->add_comment("Date format: '$sDateFormat', applied to columns {".implode(', ', $aDateToTransformReport)."}");
			}
			else
			{
				$oP->add_comment("Date format: <none>");
			}
			$oP->add_comment("Data Size: ".strlen($sCSVData));
			$oP->add_comment("Data Lines: ".$iLineCount);
			$oP->add_comment("Columns: ".implode(', ', $aInputColumns));
			$oP->add_comment("Output format: ".$sOutput);
	//		$oP->add_comment("Report level: ".$sReportLevel);
			$oP->add_comment("Simulate: ".($bSimulate ? '1' : '0'));
			$oP->add_comment("Change tracking comment: ".$sComment);
			$oP->add_comment("Issues (before synchro): ".$iCountErrors);
	//		$oP->add_comment("Warnings: ".$iCountWarnings);
			$oP->add_comment("Created (before synchro): ".$iCountCreations);
			$oP->add_comment("Updated (before synchro): ".$iCountUpdates);
		}

		//////////////////////////////////////////////////
		//
		// Synchronize
		//
		if ($bSynchronize)
		{
			$oSynchroExec = new SynchroExecution($oDataSource, $oLoadStartDate);
			$oStatLog = $oSynchroExec->Process();
			$oP->add_comment('Synchronization---');
			$oP->add_comment('------------------');
			if ($sOutput == 'details')
			{
				foreach ($oStatLog->GetTraces() as $sMessage)
				{
					$oP->add_comment($sMessage);
				}
			}
			if ($oStatLog->Get('status') == 'error')
			{
				$oP->p("ERROR: ".$oStatLog->Get('last_error'));
			}
			$oP->add_comment("Replicas: ".$oStatLog->Get('stats_nb_replica_total'));
			$oP->add_comment("Replicas touched since last synchro: ".$oStatLog->Get('stats_nb_replica_seen'));
			$oP->add_comment("Objects deleted: ".$oStatLog->Get('stats_nb_obj_deleted'));
			$oP->add_comment("Objects deletion errors: ".$oStatLog->Get('stats_nb_obj_deleted_errors'));
			$oP->add_comment("Objects obsoleted: ".$oStatLog->Get('stats_nb_obj_obsoleted'));
			$oP->add_comment("Objects obsolescence errors: ".$oStatLog->Get('stats_nb_obj_obsoleted_errors'));
			$oP->add_comment("Objects created: ".$oStatLog->Get('stats_nb_obj_created')." (".$oStatLog->Get('stats_nb_obj_created_warnings')." warnings)");
			$oP->add_comment("Objects creation errors: ".$oStatLog->Get('stats_nb_obj_created_errors'));
			$oP->add_comment("Objects updated: ".$oStatLog->Get('stats_nb_obj_updated')." (".$oStatLog->Get('stats_nb_obj_updated_warnings')." warnings)");
			$oP->add_comment("Objects update errors: ".$oStatLog->Get('stats_nb_obj_updated_errors'));
			$oP->add_comment("Objects reconciled (updated): ".$oStatLog->Get('stats_nb_obj_new_updated')." (".$oStatLog->Get('stats_nb_obj_new_updated_warnings')." warnings)");
			$oP->add_comment("Objects reconciled (unchanged): ".$oStatLog->Get('stats_nb_obj_new_unchanged')." (".$oStatLog->Get('stats_nb_obj_new_updated_warnings')." warnings)");
			$oP->add_comment("Objects reconciliation errors: ".$oStatLog->Get('stats_nb_replica_reconciled_errors'));
			$oP->add_comment("Replica disappeared, no action taken: ".$oStatLog->Get('stats_nb_replica_disappeared_no_action'));
		}
	}
	catch(Exception $e)
	{
		if ($bSimulate)
		{
			CMDBSource::Query('ROLLBACK');
		}
		throw $e;
	}
	if ($bSimulate)
	{
		CMDBSource::Query('ROLLBACK');
	}

	//////////////////////////////////////////////////
	//
	// Summary of settings and results
	//
	if ($sOutput == 'retcode')
	{
		$oP->add($iCountErrors);
	}
}
catch(ExchangeException $e)
{
	$oP->add_comment($e->getMessage());		
}
catch(SecurityException $e)
{
	$oP->add_comment($e->getMessage());		
}
catch(Exception $e)
{
	$oP->add_comment((string)$e);		
}

$oP->output();
?>