/*
 * SQL Backend for the OPIE-Calender Database.
 *
 * Copyright (c) 2003 by Stefan Eilers (Eilers.Stefan@epost.de)
 *
 * =====================================================================
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU Library General Public
 *      License as published by the Free Software Foundation; either
 *      version 2 of the License, or (at your option) any later version.
 * =====================================================================
 * =====================================================================
 * Version: $Id$
 * =====================================================================
 * History:
 * $Log$
 * Revision 1.4  2004/03/14 13:50:35  alwin
 * namespace correction
 *
 * Revision 1.3  2003/12/22 11:41:39  eilers
 * Fixing stupid bug, found by sourcode review..
 *
 * Revision 1.2  2003/12/22 10:19:26  eilers
 * Finishing implementation of sql-backend for datebook. But I have to
 * port the PIM datebook application to use it, before I could debug the
 * whole stuff.
 * Thus, PIM-Database backend is finished, but highly experimental. And some
 * parts are still generic. For instance, the "queryByExample()" methods are
 * not (or not fully) implemented. Todo: custom-entries not stored.
 * The big show stopper: matchRegExp() (needed by OpieSearch) needs regular
 * expression search in the database, which is not supported by sqlite !
 * Therefore we need either an extended sqlite or a workaround which would
 * be very slow and memory consuming..
 *
 * Revision 1.1  2003/12/08 15:18:12  eilers
 * Committing unfinished sql implementation before merging to libopie2 starts..
 *
 *
 */

#include <stdio.h>
#include <stdlib.h>

#include <qarray.h>
#include <qstringlist.h>

#include <qpe/global.h>

#include <opie2/osqldriver.h>
#include <opie2/osqlmanager.h>
#include <opie2/osqlquery.h>

#include "orecur.h"
#include "odatebookaccessbackend_sql.h"

using namespace Opie::DB;


ODateBookAccessBackend_SQL::ODateBookAccessBackend_SQL( const QString& ,
                                                        const QString& fileName )
	: ODateBookAccessBackend(), m_driver( NULL ) 
{
	m_fileName = fileName.isEmpty() ? Global::applicationFileName( "datebook", "datebook.db" ) : fileName;

    // Get the standart sql-driver from the OSQLManager..
    OSQLManager man;
    m_driver = man.standard();
    m_driver->setUrl( m_fileName );

    initFields();

    load();
}

ODateBookAccessBackend_SQL::~ODateBookAccessBackend_SQL() {
	if( m_driver )
		delete m_driver;
}

void ODateBookAccessBackend_SQL::initFields()
{

	// This map contains the translation of the fieldtype id's to 
	// the names of the table columns
	m_fieldMap.insert( OEvent::FUid, "uid" );
	m_fieldMap.insert( OEvent::FCategories, "Categories" );
	m_fieldMap.insert( OEvent::FDescription, "Description" );
	m_fieldMap.insert( OEvent::FLocation, "Location" );
	m_fieldMap.insert( OEvent::FType, "Type" );
	m_fieldMap.insert( OEvent::FAlarm, "Alarm" );
	m_fieldMap.insert( OEvent::FSound, "Sound" );
	m_fieldMap.insert( OEvent::FRType, "RType" );
	m_fieldMap.insert( OEvent::FRWeekdays, "RWeekdays" );
	m_fieldMap.insert( OEvent::FRPosition, "RPosition" );
	m_fieldMap.insert( OEvent::FRFreq, "RFreq" );
	m_fieldMap.insert( OEvent::FRHasEndDate, "RHasEndDate" );
	m_fieldMap.insert( OEvent::FREndDate, "REndDate" );
	m_fieldMap.insert( OEvent::FRCreated, "RCreated" );
	m_fieldMap.insert( OEvent::FRExceptions, "RExceptions" );
	m_fieldMap.insert( OEvent::FStart, "Start" );
	m_fieldMap.insert( OEvent::FEnd, "End" );
	m_fieldMap.insert( OEvent::FNote, "Note" );
	m_fieldMap.insert( OEvent::FTimeZone, "TimeZone" );
	m_fieldMap.insert( OEvent::FRecParent, "RecParent" );
	m_fieldMap.insert( OEvent::FRecChildren, "Recchildren" );

	// Create a map that maps the column name to the id
	QMapConstIterator<int, QString> it;
	for ( it = ++m_fieldMap.begin(); it != m_fieldMap.end(); ++it ){
		m_reverseFieldMap.insert( it.data(), it.key() );
	}
	
}

bool ODateBookAccessBackend_SQL::load() 
{
	if (!m_driver->open() )
		return false;

	// Don't expect that the database exists.
	// It is save here to create the table, even if it
	// do exist. ( Is that correct for all databases ?? )
	QString	qu = "create table datebook( uid INTEGER PRIMARY KEY ";
	
	QMap<int, QString>::Iterator it;
	for ( it = ++m_fieldMap.begin(); it != m_fieldMap.end(); ++it ){
		qu += QString( ",%1 VARCHAR(10)" ).arg( it.data() );
	}
	qu += " );";
		
	qu += "create table custom_data( uid INTEGER, id INTEGER, type VARCHAR, priority INTEGER, value VARCHAR, PRIMARY KEY /* identifier */ (uid, id) );";

	qWarning( "command: %s", qu.latin1() );

	OSQLRawQuery raw( qu );
	OSQLResult res = m_driver->query( &raw );
	if ( res.state() != OSQLResult::Success )
		return false;

	update();

	return true;
}

void ODateBookAccessBackend_SQL::update()
{

	QString qu = "select uid from datebook";
	OSQLRawQuery raw( qu );
	OSQLResult res = m_driver->query( &raw );
	if ( res.state() != OSQLResult::Success ){
		// m_uids.clear();
		return;
	}
	
	m_uids = extractUids( res );
	
}

bool ODateBookAccessBackend_SQL::reload() 
{
	return load();
}

bool ODateBookAccessBackend_SQL::save() 
{
	return m_driver->close();  // Shouldn't m_driver->sync be better than close ? (eilers)
}

QArray<int> ODateBookAccessBackend_SQL::allRecords()const 
{
	return m_uids;
}

QArray<int> ODateBookAccessBackend_SQL::queryByExample(const OEvent&, int,  const QDateTime& ) {
	return QArray<int>();
}

void ODateBookAccessBackend_SQL::clear() 
{
	QString qu = "drop table datebook;";
	qu += "drop table custom_data;";

	OSQLRawQuery raw( qu );
	OSQLResult res = m_driver->query( &raw );

	reload();
}


OEvent ODateBookAccessBackend_SQL::find( int uid ) const{
	QString qu = "select *";
	qu += "from datebook where uid = " + QString::number(uid);

	OSQLRawQuery raw( qu );
	OSQLResult res = m_driver->query( &raw );

	OSQLResultItem resItem = res.first();

	// Create Map for date event and insert UID
	QMap<int,QString> dateEventMap;
	dateEventMap.insert( OEvent::FUid, QString::number( uid ) );

	// Now insert the data out of the columns into the map.
	QMapConstIterator<int, QString> it;
	for ( it = ++m_fieldMap.begin(); it != m_fieldMap.end(); ++it ){
		dateEventMap.insert( m_reverseFieldMap[*it], resItem.data( *it ) );
	}

	// Last step: Put map into date event and return it
	OEvent retDate( dateEventMap );

	return retDate;
}

// FIXME: Speed up update of uid's..
bool ODateBookAccessBackend_SQL::add( const OEvent& ev ) 
{
	QMap<int,QString> eventMap = ev.toMap();

	QString qu = "insert into datebook VALUES( " + QString::number( ev.uid() );
	QMap<int, QString>::Iterator it;
	for ( it = ++m_fieldMap.begin(); it != m_fieldMap.end(); ++it ){
		if ( !eventMap[it.key()].isEmpty() )
			qu += QString( ",\"%1\"" ).arg( eventMap[it.key()] );
		else
			qu += QString( ",\"\"" );
	}
	qu += " );";

	// Add custom entries
	int id = 0;
	QMap<QString, QString> customMap = ev.toExtraMap();
	for( QMap<QString, QString>::Iterator it = customMap.begin(); 
	     it != customMap.end(); ++it ){
		qu  += "insert into custom_data VALUES(" 
			+  QString::number( ev.uid() )
			+ ","
			+  QString::number( id++ ) 
			+ ",'" 
			+ it.key() //.latin1()
			+ "',"
			+ "0" // Priority for future enhancements
			+ ",'" 
			+ it.data() //.latin1()
			+ "');";
	}		
	qWarning("add %s", qu.latin1() );

	OSQLRawQuery raw( qu );
	OSQLResult res = m_driver->query( &raw );
	if ( res.state() != OSQLResult::Success ){
		return false;
	}

	// Update list of uid's 
	update();
	
	return true;
}

// FIXME: Speed up update of uid's..
bool ODateBookAccessBackend_SQL::remove( int uid ) 
{
	QString qu = "DELETE from datebook where uid = " 
		+ QString::number( uid ) + ";";
	qu += "DELETE from custom_data where uid = " 
		+ QString::number( uid ) + ";";
	
	OSQLRawQuery raw( qu );
	OSQLResult res = m_driver->query( &raw );
	if ( res.state() != OSQLResult::Success ){
		return false;
	}

	// Update list of uid's
	update();

	return true;
}

bool ODateBookAccessBackend_SQL::replace( const OEvent& ev ) 
{
    remove( ev.uid() );
    return add( ev );
}

QArray<int> ODateBookAccessBackend_SQL::rawEvents()const 
{
    return allRecords();
}

QArray<int> ODateBookAccessBackend_SQL::rawRepeats()const 
{
	QString qu = "select uid from datebook where RType!=\"\" AND RType!=\"NoRepeat\"";
	OSQLRawQuery raw( qu );
	OSQLResult res = m_driver->query( &raw );
	if ( res.state() != OSQLResult::Success ){
		QArray<int> nix;
		return nix;
	}
	
	return extractUids( res );
}

QArray<int> ODateBookAccessBackend_SQL::nonRepeats()const 
{
	QString qu = "select uid from datebook where RType=\"\" or RType=\"NoRepeat\"";
	OSQLRawQuery raw( qu );
	OSQLResult res = m_driver->query( &raw );
	if ( res.state() != OSQLResult::Success ){
		QArray<int> nix;
		return nix;
	}
	
	return extractUids( res );
}

OEvent::ValueList ODateBookAccessBackend_SQL::directNonRepeats() 
{
	QArray<int> nonRepUids = nonRepeats();
	OEvent::ValueList list;

	for (uint i = 0; i < nonRepUids.count(); ++i ){
		list.append( find( nonRepUids[i] ) );
	}

	return list;

}
OEvent::ValueList ODateBookAccessBackend_SQL::directRawRepeats() 
{
	QArray<int> rawRepUids = rawRepeats();
	OEvent::ValueList list;

	for (uint i = 0; i < rawRepUids.count(); ++i ){
		list.append( find( rawRepUids[i] ) );
	}

	return list;
}


QArray<int> ODateBookAccessBackend_SQL::matchRegexp(  const QRegExp &r ) const
{
	QArray<int> null;
	return null;
}

/* ===== Private Functions ========================================== */

QArray<int> ODateBookAccessBackend_SQL::extractUids( OSQLResult& res ) const
{
	qWarning("extractUids");
	QTime t;
	t.start();
	OSQLResultItem::ValueList list = res.results();
	OSQLResultItem::ValueList::Iterator it;
	QArray<int> ints(list.count() );
	qWarning(" count = %d", list.count() );

	int i = 0;
	for (it = list.begin(); it != list.end(); ++it ) {
		ints[i] =  (*it).data("uid").toInt();
		i++;
	}
	qWarning("extractUids ready: count2 = %d needs %d ms", i, t.elapsed() );

	return ints;

}