#!/usr/bin/php -Cq
<?php

require_once(dirname(dirname(__FILE__)).'/settings/settings.php');
require_once(CONST_BasePath.'/lib/init-cmd.php');
ini_set('memory_limit', '800M');

$aCMDOptions
= array(
   "Create and setup nominatim search system",
   array('help', 'h', 0, 1, 0, 0, false, 'Show Help'),
   array('quiet', 'q', 0, 1, 0, 0, 'bool', 'Quiet output'),
   array('verbose', 'v', 0, 1, 0, 0, 'bool', 'Verbose output'),

   array('osm-file', '', 0, 1, 1, 1, 'realpath', 'File to import'),
   array('threads', '', 0, 1, 1, 1, 'int', 'Number of threads (where possible)'),

   array('all', '', 0, 1, 0, 0, 'bool', 'Do the complete process'),

   array('create-db', '', 0, 1, 0, 0, 'bool', 'Create nominatim db'),
   array('setup-db', '', 0, 1, 0, 0, 'bool', 'Build a blank nominatim db'),
   array('import-data', '', 0, 1, 0, 0, 'bool', 'Import a osm file'),
   array('osm2pgsql-cache', '', 0, 1, 1, 1, 'int', 'Cache size used by osm2pgsql'),
   array('create-functions', '', 0, 1, 0, 0, 'bool', 'Create functions'),
   array('enable-diff-updates', '', 0, 1, 0, 0, 'bool', 'Turn on the code required to make diff updates work'),
   array('enable-debug-statements', '', 0, 1, 0, 0, 'bool', 'Include debug warning statements in pgsql commands'),
   array('ignore-errors', '', 0, 1, 0, 0, 'bool', 'Continue import even when errors in SQL are present (EXPERT)'),
   array('create-tables', '', 0, 1, 0, 0, 'bool', 'Create main tables'),
   array('create-partition-tables', '', 0, 1, 0, 0, 'bool', 'Create required partition tables'),
   array('create-partition-functions', '', 0, 1, 0, 0, 'bool', 'Create required partition triggers'),
   array('no-partitions', '', 0, 1, 0, 0, 'bool', "Do not partition search indices (speeds up import of single country extracts)"),
   array('import-wikipedia-articles', '', 0, 1, 0, 0, 'bool', 'Import wikipedia article dump'),
   array('load-data', '', 0, 1, 0, 0, 'bool', 'Copy data to live tables from import table'),
   array('disable-token-precalc', '', 0, 1, 0, 0, 'bool', 'Disable name precalculation (EXPERT)'),
   array('import-tiger-data', '', 0, 1, 0, 0, 'bool', 'Import tiger data (not included in \'all\')'),
   array('calculate-postcodes', '', 0, 1, 0, 0, 'bool', 'Calculate postcode centroids'),
   array('osmosis-init', '', 0, 1, 0, 0, 'bool', 'Generate default osmosis configuration'),
   array('index', '', 0, 1, 0, 0, 'bool', 'Index the data'),
   array('index-noanalyse', '', 0, 1, 0, 0, 'bool', 'Do not perform analyse operations during index (EXPERT)'),
   array('create-search-indices', '', 0, 1, 0, 0, 'bool', 'Create additional indices required for search and update'),
   array('create-country-names', '', 0, 1, 0, 0, 'bool', 'Create default list of searchable country names'),
   array('drop', '', 0, 1, 0, 0, 'bool', 'Drop tables needed for updates, making the database readonly (EXPERIMENTAL)'),
  );
getCmdOpt($_SERVER['argv'], $aCMDOptions, $aCMDResult, true, true);

$bDidSomething = false;

// Check if osm-file is set and points to a valid file if --all or --import-data is given
if ($aCMDResult['import-data'] || $aCMDResult['all']) {
    if (!isset($aCMDResult['osm-file'])) {
        fail('missing --osm-file for data import');
    }

    if (!file_exists($aCMDResult['osm-file'])) {
        fail('the path supplied to --osm-file does not exist');
    }

    if (!is_readable($aCMDResult['osm-file'])) {
        fail('osm-file "'.$aCMDResult['osm-file'].'" not readable');
    }
}


// This is a pretty hard core default - the number of processors in the box - 1
$iInstances = isset($aCMDResult['threads'])?$aCMDResult['threads']:(getProcessorCount()-1);
if ($iInstances < 1) {
    $iInstances = 1;
    echo "WARNING: resetting threads to $iInstances\n";
}
if ($iInstances > getProcessorCount()) {
    $iInstances = getProcessorCount();
    echo "WARNING: resetting threads to $iInstances\n";
}

// Assume we can steal all the cache memory in the box (unless told otherwise)
if (isset($aCMDResult['osm2pgsql-cache'])) {
    $iCacheMemory = $aCMDResult['osm2pgsql-cache'];
} else {
    $iCacheMemory = getCacheMemoryMB();
}

$aDSNInfo = DB::parseDSN(CONST_Database_DSN);
if (!isset($aDSNInfo['port']) || !$aDSNInfo['port']) $aDSNInfo['port'] = 5432;

if ($aCMDResult['create-db'] || $aCMDResult['all']) {
    echo "Create DB\n";
    $bDidSomething = true;
    $oDB = DB::connect(CONST_Database_DSN, false);
    if (!PEAR::isError($oDB)) {
        fail('database already exists ('.CONST_Database_DSN.')');
    }
    passthruCheckReturn('createdb -E UTF-8 -p '.$aDSNInfo['port'].' '.$aDSNInfo['database']);
}

if ($aCMDResult['setup-db'] || $aCMDResult['all']) {
    echo "Setup DB\n";
    $bDidSomething = true;

    // TODO: path detection, detection memory, etc.
    //
    $oDB =& getDB();

    $fPostgresVersion = getPostgresVersion($oDB);
    echo 'Postgres version found: '.$fPostgresVersion."\n";

    if ($fPostgresVersion < 9.1) {
        fail("Minimum supported version of Postgresql is 9.1.");
    }

    pgsqlRunScript('CREATE EXTENSION IF NOT EXISTS hstore');
    pgsqlRunScript('CREATE EXTENSION IF NOT EXISTS postgis');

    // For extratags and namedetails the hstore_to_json converter is
    // needed which is only available from Postgresql 9.3+. For older
    // versions add a dummy function that returns nothing.
    $iNumFunc = chksql($oDB->getOne("select count(*) from pg_proc where proname = 'hstore_to_json'"));

    if ($iNumFunc == 0) {
        pgsqlRunScript("create function hstore_to_json(dummy hstore) returns text AS 'select null::text' language sql immutable");
        echo "WARNING: Postgresql is too old. extratags and namedetails API not available.";
    }

    $fPostgisVersion = getPostgisVersion($oDB);
    echo 'Postgis version found: '.$fPostgisVersion."\n";

    if ($fPostgisVersion < 2.1) {
        // Functions were renamed in 2.1 and throw an annoying deprecation warning
        pgsqlRunScript('ALTER FUNCTION st_line_interpolate_point(geometry, double precision) RENAME TO ST_LineInterpolatePoint');
        pgsqlRunScript('ALTER FUNCTION ST_Line_Locate_Point(geometry, geometry) RENAME TO ST_LineLocatePoint');
    }
    if ($fPostgisVersion < 2.2) {
        pgsqlRunScript('ALTER FUNCTION ST_Distance_Spheroid(geometry, geometry, spheroid) RENAME TO ST_DistanceSpheroid');
    }

    pgsqlRunScriptFile(CONST_BasePath.'/data/country_name.sql');
    pgsqlRunScriptFile(CONST_BasePath.'/data/country_naturalearthdata.sql');
    pgsqlRunScriptFile(CONST_BasePath.'/data/country_osm_grid.sql');
    pgsqlRunScriptFile(CONST_BasePath.'/data/gb_postcode_table.sql');
    if (file_exists(CONST_BasePath.'/data/gb_postcode_data.sql.gz')) {
        pgsqlRunScriptFile(CONST_BasePath.'/data/gb_postcode_data.sql.gz');
    } else {
        echo "WARNING: external UK postcode table not found.\n";
    }
    if (CONST_Use_Extra_US_Postcodes) {
        pgsqlRunScriptFile(CONST_BasePath.'/data/us_postcode.sql');
    }

    if ($aCMDResult['no-partitions']) {
        pgsqlRunScript('update country_name set partition = 0');
    }

    // the following will be needed by create_functions later but
    // is only defined in the subsequently called create_tables.
    // Create dummies here that will be overwritten by the proper
    // versions in create-tables.
    pgsqlRunScript('CREATE TABLE place_boundingbox ()');
    pgsqlRunScript('create type wikipedia_article_match as ()');
}

if ($aCMDResult['import-data'] || $aCMDResult['all']) {
    echo "Import\n";
    $bDidSomething = true;

    $osm2pgsql = CONST_Osm2pgsql_Binary;
    if (!file_exists($osm2pgsql)) {
        echo "Check CONST_Osm2pgsql_Binary in your local settings file.\n";
        echo "Normally you should not need to set this manually.\n";
        fail("osm2pgsql not found in '$osm2pgsql'");
    }

    if (!is_null(CONST_Osm2pgsql_Flatnode_File)) {
        $osm2pgsql .= ' --flat-nodes '.CONST_Osm2pgsql_Flatnode_File;
    }
    if (CONST_Tablespace_Osm2pgsql_Data)
        $osm2pgsql .= ' --tablespace-slim-data '.CONST_Tablespace_Osm2pgsql_Data;
    if (CONST_Tablespace_Osm2pgsql_Index)
        $osm2pgsql .= ' --tablespace-slim-index '.CONST_Tablespace_Osm2pgsql_Index;
    if (CONST_Tablespace_Place_Data)
        $osm2pgsql .= ' --tablespace-main-data '.CONST_Tablespace_Place_Data;
    if (CONST_Tablespace_Place_Index)
        $osm2pgsql .= ' --tablespace-main-index '.CONST_Tablespace_Place_Index;
    $osm2pgsql .= ' -lsc -O gazetteer --hstore --number-processes 1';
    $osm2pgsql .= ' -C '.$iCacheMemory;
    $osm2pgsql .= ' -P '.$aDSNInfo['port'];
    $osm2pgsql .= ' -d '.$aDSNInfo['database'].' '.$aCMDResult['osm-file'];
    passthruCheckReturn($osm2pgsql);

    $oDB =& getDB();
    if (!$aCMDResult['ignore-errors'] && !chksql($oDB->getRow('select * from place limit 1'))) {
        fail('No Data');
    }
}

if ($aCMDResult['create-functions'] || $aCMDResult['all']) {
    echo "Functions\n";
    $bDidSomething = true;
    if (!file_exists(CONST_InstallPath.'/module/nominatim.so')) fail("nominatim module not built");
    create_sql_functions($aCMDResult);
}

if ($aCMDResult['create-tables'] || $aCMDResult['all']) {
    $bDidSomething = true;

    echo "Tables\n";
    $sTemplate = file_get_contents(CONST_BasePath.'/sql/tables.sql');
    $sTemplate = str_replace('{www-user}', CONST_Database_Web_User, $sTemplate);
    $sTemplate = replace_tablespace(
        '{ts:address-data}',
        CONST_Tablespace_Address_Data,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:address-index}',
        CONST_Tablespace_Address_Index,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:search-data}',
        CONST_Tablespace_Search_Data,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:search-index}',
        CONST_Tablespace_Search_Index,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:aux-data}',
        CONST_Tablespace_Aux_Data,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:aux-index}',
        CONST_Tablespace_Aux_Index,
        $sTemplate
    );
    pgsqlRunScript($sTemplate, false);

    // re-run the functions
    echo "Functions\n";
    create_sql_functions($aCMDResult);
}

if ($aCMDResult['create-partition-tables'] || $aCMDResult['all']) {
    echo "Partition Tables\n";
    $bDidSomething = true;

    $sTemplate = file_get_contents(CONST_BasePath.'/sql/partition-tables.src.sql');
    $sTemplate = replace_tablespace(
        '{ts:address-data}',
        CONST_Tablespace_Address_Data,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:address-index}',
        CONST_Tablespace_Address_Index,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:search-data}',
        CONST_Tablespace_Search_Data,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:search-index}',
        CONST_Tablespace_Search_Index,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:aux-data}',
        CONST_Tablespace_Aux_Data,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:aux-index}',
        CONST_Tablespace_Aux_Index,
        $sTemplate
    );

    pgsqlRunPartitionScript($sTemplate);
}


if ($aCMDResult['create-partition-functions'] || $aCMDResult['all']) {
    echo "Partition Functions\n";
    $bDidSomething = true;

    $sTemplate = file_get_contents(CONST_BasePath.'/sql/partition-functions.src.sql');

    pgsqlRunPartitionScript($sTemplate);
}

if ($aCMDResult['import-wikipedia-articles'] || $aCMDResult['all']) {
    $bDidSomething = true;
    $sWikiArticlesFile = CONST_Wikipedia_Data_Path.'/wikipedia_article.sql.bin';
    $sWikiRedirectsFile = CONST_Wikipedia_Data_Path.'/wikipedia_redirect.sql.bin';
    if (file_exists($sWikiArticlesFile)) {
        echo "Importing wikipedia articles...";
        pgsqlRunDropAndRestore($sWikiArticlesFile);
        echo "...done\n";
    } else {
        echo "WARNING: wikipedia article dump file not found - places will have default importance\n";
    }
    if (file_exists($sWikiRedirectsFile)) {
        echo "Importing wikipedia redirects...";
        pgsqlRunDropAndRestore($sWikiRedirectsFile);
        echo "...done\n";
    } else {
        echo "WARNING: wikipedia redirect dump file not found - some place importance values may be missing\n";
    }
}


if ($aCMDResult['load-data'] || $aCMDResult['all']) {
    echo "Drop old Data\n";
    $bDidSomething = true;

    $oDB =& getDB();
    if (!pg_query($oDB->connection, 'TRUNCATE word')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'TRUNCATE placex')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'TRUNCATE location_property_osmline')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'TRUNCATE place_addressline')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'TRUNCATE place_boundingbox')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'TRUNCATE location_area')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'TRUNCATE search_name')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'TRUNCATE search_name_blank')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'DROP SEQUENCE seq_place')) fail(pg_last_error($oDB->connection));
    echo '.';
    if (!pg_query($oDB->connection, 'CREATE SEQUENCE seq_place start 100000')) fail(pg_last_error($oDB->connection));
    echo '.';

    $sSQL = 'select distinct partition from country_name';
    $aPartitions = chksql($oDB->getCol($sSQL));
    if (!$aCMDResult['no-partitions']) $aPartitions[] = 0;
    foreach ($aPartitions as $sPartition) {
        if (!pg_query($oDB->connection, 'TRUNCATE location_road_'.$sPartition)) fail(pg_last_error($oDB->connection));
        echo '.';
    }

    // used by getorcreate_word_id to ignore frequent partial words
    $sSQL = 'CREATE OR REPLACE FUNCTION get_maxwordfreq() RETURNS integer AS ';
    $sSQL .= '$$ SELECT '.CONST_Max_Word_Frequency.' as maxwordfreq; $$ LANGUAGE SQL IMMUTABLE';
    if (!pg_query($oDB->connection, $sSQL)) {
        fail(pg_last_error($oDB->connection));
    }
    echo ".\n";

    // pre-create the word list
    if (!$aCMDResult['disable-token-precalc']) {
        echo "Loading word list\n";
        pgsqlRunScriptFile(CONST_BasePath.'/data/words.sql');
    }

    echo "Load Data\n";
    $aDBInstances = array();
    $iLoadThreads = max(1, $iInstances - 1);
    for ($i = 0; $i < $iLoadThreads; $i++) {
        $aDBInstances[$i] =& getDB(true);
        $sSQL = 'insert into placex (osm_type, osm_id, class, type, name, admin_level, ';
        $sSQL .= '                   address, extratags, geometry) ';
        $sSQL .= 'select * from place where osm_id % '.$iLoadThreads.' = '.$i;
        $sSQL .= " and not (class='place' and type='houses' and osm_type='W'";
        $sSQL .= "          and ST_GeometryType(geometry) = 'ST_LineString')";
        $sSQL .= " and ST_IsValid(geometry)";
        if ($aCMDResult['verbose']) echo "$sSQL\n";
        if (!pg_send_query($aDBInstances[$i]->connection, $sSQL)) {
            fail(pg_last_error($aDBInstances[$i]->connection));
        }
    }
    // last thread for interpolation lines
    $aDBInstances[$iLoadThreads] =& getDB(true);
    $sSQL = 'insert into location_property_osmline';
    $sSQL .= ' (osm_id, address, linegeo)';
    $sSQL .= ' SELECT osm_id, address, geometry from place where ';
    $sSQL .= "class='place' and type='houses' and osm_type='W' and ST_GeometryType(geometry) = 'ST_LineString'";
    if ($aCMDResult['verbose']) echo "$sSQL\n";
    if (!pg_send_query($aDBInstances[$iLoadThreads]->connection, $sSQL)) {
        fail(pg_last_error($aDBInstances[$iLoadThreads]->connection));
    }

    $bAnyBusy = true;
    while ($bAnyBusy) {
        $bAnyBusy = false;
        for ($i = 0; $i <= $iLoadThreads; $i++) {
            if (pg_connection_busy($aDBInstances[$i]->connection)) $bAnyBusy = true;
        }
        sleep(1);
        echo '.';
    }
    echo "\n";
    echo "Reanalysing database...\n";
    pgsqlRunScript('ANALYSE');
}

if ($aCMDResult['import-tiger-data']) {
    $bDidSomething = true;

    $sTemplate = file_get_contents(CONST_BasePath.'/sql/tiger_import_start.sql');
    $sTemplate = str_replace('{www-user}', CONST_Database_Web_User, $sTemplate);
    $sTemplate = replace_tablespace(
        '{ts:aux-data}',
        CONST_Tablespace_Aux_Data,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:aux-index}',
        CONST_Tablespace_Aux_Index,
        $sTemplate
    );
    pgsqlRunScript($sTemplate, false);

    $aDBInstances = array();
    for ($i = 0; $i < $iInstances; $i++) {
        $aDBInstances[$i] =& getDB(true);
    }

    foreach (glob(CONST_Tiger_Data_Path.'/*.sql') as $sFile) {
        echo $sFile.': ';
        $hFile = fopen($sFile, "r");
        $sSQL = fgets($hFile, 100000);
        $iLines = 0;

        while (true) {
            for ($i = 0; $i < $iInstances; $i++) {
                if (!pg_connection_busy($aDBInstances[$i]->connection)) {
                    while (pg_get_result($aDBInstances[$i]->connection));
                    $sSQL = fgets($hFile, 100000);
                    if (!$sSQL) break 2;
                    if (!pg_send_query($aDBInstances[$i]->connection, $sSQL)) fail(pg_last_error($oDB->connection));
                    $iLines++;
                    if ($iLines == 1000) {
                        echo ".";
                        $iLines = 0;
                    }
                }
            }
            usleep(10);
        }

        fclose($hFile);

        $bAnyBusy = true;
        while ($bAnyBusy) {
            $bAnyBusy = false;
            for ($i = 0; $i < $iInstances; $i++) {
                if (pg_connection_busy($aDBInstances[$i]->connection)) $bAnyBusy = true;
            }
            usleep(10);
        }
        echo "\n";
    }

    echo "Creating indexes\n";
    $sTemplate = file_get_contents(CONST_BasePath.'/sql/tiger_import_finish.sql');
    $sTemplate = str_replace('{www-user}', CONST_Database_Web_User, $sTemplate);
    $sTemplate = replace_tablespace(
        '{ts:aux-data}',
        CONST_Tablespace_Aux_Data,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:aux-index}',
        CONST_Tablespace_Aux_Index,
        $sTemplate
    );
    pgsqlRunScript($sTemplate, false);
}

if ($aCMDResult['calculate-postcodes'] || $aCMDResult['all']) {
    $bDidSomething = true;
    $oDB =& getDB();
    if (!pg_query($oDB->connection, 'DELETE from placex where osm_type=\'P\'')) fail(pg_last_error($oDB->connection));
    $sSQL = "insert into placex (osm_type,osm_id,class,type,postcode,country_code,geometry) ";
    $sSQL .= "select 'P',nextval('seq_postcodes'),'place','postcode',postcode,country_code,";
    $sSQL .= "ST_SetSRID(ST_Point(x,y),4326) as geometry from (select country_code,postcode,";
    $sSQL .= "avg(st_x(st_centroid(geometry))) as x,avg(st_y(st_centroid(geometry))) as y ";
    $sSQL .= "from placex where postcode is not null group by country_code,postcode) as x ";
    $sSQL .= "where ST_Point(x,y) is not null";
    if (!pg_query($oDB->connection, $sSQL)) fail(pg_last_error($oDB->connection));

    if (CONST_Use_Extra_US_Postcodes) {
        $sSQL = "insert into placex (osm_type,osm_id,class,type,postcode,country_code,geometry) ";
        $sSQL .= "select 'P',nextval('seq_postcodes'),'place','postcode',postcode,'us',";
        $sSQL .= "ST_SetSRID(ST_Point(x,y),4326) as geometry from us_postcode";
        if (!pg_query($oDB->connection, $sSQL)) fail(pg_last_error($oDB->connection));
    }
}

if ($aCMDResult['osmosis-init'] || ($aCMDResult['all'] && !$aCMDResult['drop'])) { // no use doing osmosis-init when dropping update tables
    $bDidSomething = true;
    $oDB =& getDB();

    if (!file_exists(CONST_Osmosis_Binary)) {
        echo "Please download osmosis.\nIf it is already installed, check the path in your local settings (settings/local.php) file.\n";
        if (!$aCMDResult['all']) {
            fail("osmosis not found in '".CONST_Osmosis_Binary."'");
        }
    } else {
        if (file_exists(CONST_InstallPath.'/settings/configuration.txt')) {
            echo "settings/configuration.txt already exists\n";
        } else {
            passthru(CONST_Osmosis_Binary.' --read-replication-interval-init '.CONST_InstallPath.'/settings');
            // update osmosis configuration.txt with our settings
            passthru("sed -i 's!baseUrl=.*!baseUrl=".CONST_Replication_Url."!' ".CONST_InstallPath.'/settings/configuration.txt');
            passthru("sed -i 's:maxInterval = .*:maxInterval = ".CONST_Replication_MaxInterval.":' ".CONST_InstallPath.'/settings/configuration.txt');
        }

        // Find the last node in the DB
        $iLastOSMID = $oDB->getOne("select max(osm_id) from place where osm_type = 'N'");

        // Lookup the timestamp that node was created (less 3 hours for margin for changsets to be closed)
        $sLastNodeURL = 'http://www.openstreetmap.org/api/0.6/node/'.$iLastOSMID."/1";
        $sLastNodeXML = file_get_contents($sLastNodeURL);
        preg_match('#timestamp="(([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})Z)"#', $sLastNodeXML, $aLastNodeDate);
        $iLastNodeTimestamp = strtotime($aLastNodeDate[1]) - (3*60*60);

        // Search for the correct state file - uses file timestamps so need to sort by date descending
        $sRepURL = CONST_Replication_Url."/";
        $sRep = file_get_contents($sRepURL."?C=M;O=D;F=1");
        // download.geofabrik.de:    <a href="000/">000/</a></td><td align="right">26-Feb-2013 11:53  </td>
        // planet.openstreetmap.org: <a href="273/">273/</a>                    2013-03-11 07:41    -
        preg_match_all('#<a href="[0-9]{3}/">([0-9]{3}/)</a>\s*([-0-9a-zA-Z]+ [0-9]{2}:[0-9]{2})#', $sRep, $aRepMatches, PREG_SET_ORDER);
        if ($aRepMatches) {
            $aPrevRepMatch = false;
            foreach ($aRepMatches as $aRepMatch) {
                if (strtotime($aRepMatch[2]) < $iLastNodeTimestamp) break;
                $aPrevRepMatch = $aRepMatch;
            }
            if ($aPrevRepMatch) $aRepMatch = $aPrevRepMatch;

            $sRepURL .= $aRepMatch[1];
            $sRep = file_get_contents($sRepURL."?C=M;O=D;F=1");
            preg_match_all('#<a href="[0-9]{3}/">([0-9]{3}/)</a>\s*([-0-9a-zA-Z]+ [0-9]{2}:[0-9]{2})#', $sRep, $aRepMatches, PREG_SET_ORDER);
            $aPrevRepMatch = false;
            foreach ($aRepMatches as $aRepMatch) {
                if (strtotime($aRepMatch[2]) < $iLastNodeTimestamp) break;
                $aPrevRepMatch = $aRepMatch;
            }
            if ($aPrevRepMatch) $aRepMatch = $aPrevRepMatch;

            $sRepURL .= $aRepMatch[1];
            $sRep = file_get_contents($sRepURL."?C=M;O=D;F=1");
            preg_match_all('#<a href="[0-9]{3}.state.txt">([0-9]{3}).state.txt</a>\s*([-0-9a-zA-Z]+ [0-9]{2}:[0-9]{2})#', $sRep, $aRepMatches, PREG_SET_ORDER);
            $aPrevRepMatch = false;
            foreach ($aRepMatches as $aRepMatch) {
                if (strtotime($aRepMatch[2]) < $iLastNodeTimestamp) break;
                $aPrevRepMatch = $aRepMatch;
            }
            if ($aPrevRepMatch) $aRepMatch = $aPrevRepMatch;

            $sRepURL .= $aRepMatch[1].'.state.txt';
            echo "Getting state file: $sRepURL\n";
            $sStateFile = file_get_contents($sRepURL);
            if (!$sStateFile || strlen($sStateFile) > 1000) fail("unable to obtain state file");
            file_put_contents(CONST_InstallPath.'/settings/state.txt', $sStateFile);
            echo "Updating DB status\n";
            pg_query($oDB->connection, 'TRUNCATE import_status');
            $sSQL = "INSERT INTO import_status VALUES('".$aRepMatch[2]."')";
            pg_query($oDB->connection, $sSQL);
        } else {
            if (!$aCMDResult['all']) {
                fail("Cannot read state file directory.");
            }
        }
    }
}

if ($aCMDResult['index'] || $aCMDResult['all']) {
    $bDidSomething = true;
    $sOutputFile = '';
    $sBaseCmd = CONST_InstallPath.'/nominatim/nominatim -i -d '.$aDSNInfo['database'].' -P '.$aDSNInfo['port'].' -t '.$iInstances.$sOutputFile;
    passthruCheckReturn($sBaseCmd.' -R 4');
    if (!$aCMDResult['index-noanalyse']) pgsqlRunScript('ANALYSE');
    passthruCheckReturn($sBaseCmd.' -r 5 -R 25');
    if (!$aCMDResult['index-noanalyse']) pgsqlRunScript('ANALYSE');
    passthruCheckReturn($sBaseCmd.' -r 26');
}

if ($aCMDResult['create-search-indices'] || $aCMDResult['all']) {
    echo "Search indices\n";
    $bDidSomething = true;

    $sTemplate = file_get_contents(CONST_BasePath.'/sql/indices.src.sql');
    $sTemplate = replace_tablespace(
        '{ts:address-index}',
        CONST_Tablespace_Address_Index,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:search-index}',
        CONST_Tablespace_Search_Index,
        $sTemplate
    );
    $sTemplate = replace_tablespace(
        '{ts:aux-index}',
        CONST_Tablespace_Aux_Index,
        $sTemplate
    );

    pgsqlRunScript($sTemplate);
}

if ($aCMDResult['create-country-names'] || $aCMDResult['all']) {
    echo 'Creating search index for default country names';
    $bDidSomething = true;

    pgsqlRunScript("select getorcreate_country(make_standard_name('uk'), 'gb')");
    pgsqlRunScript("select getorcreate_country(make_standard_name('united states'), 'us')");
    pgsqlRunScript("select count(*) from (select getorcreate_country(make_standard_name(country_code), country_code) from country_name where country_code is not null) as x");
    pgsqlRunScript("select count(*) from (select getorcreate_country(make_standard_name(name->'name'), country_code) from country_name where name ? 'name') as x");

    $sSQL = 'select count(*) from (select getorcreate_country(make_standard_name(v), country_code) from (select country_code, skeys(name) as k, svals(name) as v from country_name) x where k ';
    if (CONST_Languages) {
        $sSQL .= 'in ';
        $sDelim = '(';
        foreach (explode(',', CONST_Languages) as $sLang) {
            $sSQL .= $sDelim."'name:$sLang'";
            $sDelim = ',';
        }
        $sSQL .= ')';
    } else {
        // all include all simple name tags
        $sSQL .= "like 'name:%'";
    }
    $sSQL .= ') v';
    pgsqlRunScript($sSQL);
}

if ($aCMDResult['drop']) {
    // The implementation is potentially a bit dangerous because it uses
    // a positive selection of tables to keep, and deletes everything else.
    // Including any tables that the unsuspecting user might have manually
    // created. USE AT YOUR OWN PERIL.
    $bDidSomething = true;

    // tables we want to keep. everything else goes.
    $aKeepTables = array(
                    "*columns",
                    "import_polygon_*",
                    "import_status",
                    "place_addressline",
                    "location_property*",
                    "placex",
                    "search_name",
                    "seq_*",
                    "word",
                    "query_log",
                    "new_query_log",
                    "gb_postcode",
                    "spatial_ref_sys",
                    "country_name",
                    "place_classtype_*"
                   );

    $oDB =& getDB();
    $aDropTables = array();
    $aHaveTables = chksql($oDB->getCol("SELECT tablename FROM pg_tables WHERE schemaname='public'"));

    foreach ($aHaveTables as $sTable) {
        $bFound = false;
        foreach ($aKeepTables as $sKeep) {
            if (fnmatch($sKeep, $sTable)) {
                $bFound = true;
                break;
            }
        }
        if (!$bFound) array_push($aDropTables, $sTable);
    }

    foreach ($aDropTables as $sDrop) {
        if ($aCMDResult['verbose']) echo "dropping table $sDrop\n";
        @pg_query($oDB->connection, "DROP TABLE $sDrop CASCADE");
        // ignore warnings/errors as they might be caused by a table having
        // been deleted already by CASCADE
    }

    if (!is_null(CONST_Osm2pgsql_Flatnode_File)) {
        if ($aCMDResult['verbose']) echo "deleting ".CONST_Osm2pgsql_Flatnode_File."\n";
        unlink(CONST_Osm2pgsql_Flatnode_File);
    }
}

if (!$bDidSomething) {
    showUsage($aCMDOptions, true);
} else {
    echo "Setup finished.\n";
}


function pgsqlRunScriptFile($sFilename)
{
    if (!file_exists($sFilename)) fail('unable to find '.$sFilename);

    // Convert database DSN to psql parameters
    $aDSNInfo = DB::parseDSN(CONST_Database_DSN);
    if (!isset($aDSNInfo['port']) || !$aDSNInfo['port']) $aDSNInfo['port'] = 5432;
    $sCMD = 'psql -p '.$aDSNInfo['port'].' -d '.$aDSNInfo['database'];

    $ahGzipPipes = null;
    if (preg_match('/\\.gz$/', $sFilename)) {
        $aDescriptors = array(
                         0 => array('pipe', 'r'),
                         1 => array('pipe', 'w'),
                         2 => array('file', '/dev/null', 'a')
                        );
        $hGzipProcess = proc_open('zcat '.$sFilename, $aDescriptors, $ahGzipPipes);
        if (!is_resource($hGzipProcess)) fail('unable to start zcat');
        $aReadPipe = $ahGzipPipes[1];
        fclose($ahGzipPipes[0]);
    } else {
        $sCMD .= ' -f '.$sFilename;
        $aReadPipe = array('pipe', 'r');
    }

    $aDescriptors = array(
                     0 => $aReadPipe,
                     1 => array('pipe', 'w'),
                     2 => array('file', '/dev/null', 'a')
                    );
    $ahPipes = null;
    $hProcess = proc_open($sCMD, $aDescriptors, $ahPipes);
    if (!is_resource($hProcess)) fail('unable to start pgsql');


    // TODO: error checking
    while (!feof($ahPipes[1])) {
        echo fread($ahPipes[1], 4096);
    }
    fclose($ahPipes[1]);

    $iReturn = proc_close($hProcess);
    if ($iReturn > 0) {
        fail("pgsql returned with error code ($iReturn)");
    }
    if ($ahGzipPipes) {
        fclose($ahGzipPipes[1]);
        proc_close($hGzipProcess);
    }
}

function pgsqlRunScript($sScript, $bfatal = true)
{
    global $aCMDResult;
    // Convert database DSN to psql parameters
    $aDSNInfo = DB::parseDSN(CONST_Database_DSN);
    if (!isset($aDSNInfo['port']) || !$aDSNInfo['port']) $aDSNInfo['port'] = 5432;
    $sCMD = 'psql -p '.$aDSNInfo['port'].' -d '.$aDSNInfo['database'];
    if ($bfatal && !$aCMDResult['ignore-errors'])
        $sCMD .= ' -v ON_ERROR_STOP=1';
    $aDescriptors = array(
                     0 => array('pipe', 'r'),
                     1 => STDOUT,
                     2 => STDERR
                    );
    $ahPipes = null;
    $hProcess = @proc_open($sCMD, $aDescriptors, $ahPipes);
    if (!is_resource($hProcess)) fail('unable to start pgsql');

    while (strlen($sScript)) {
        $written = fwrite($ahPipes[0], $sScript);
        if ($written <= 0) break;
        $sScript = substr($sScript, $written);
    }
    fclose($ahPipes[0]);
    $iReturn = proc_close($hProcess);
    if ($bfatal && $iReturn > 0) {
        fail("pgsql returned with error code ($iReturn)");
    }
}

function pgsqlRunPartitionScript($sTemplate)
{
    global $aCMDResult;
    $oDB =& getDB();

    $sSQL = 'select distinct partition from country_name';
    $aPartitions = chksql($oDB->getCol($sSQL));
    if (!$aCMDResult['no-partitions']) $aPartitions[] = 0;

    preg_match_all('#^-- start(.*?)^-- end#ms', $sTemplate, $aMatches, PREG_SET_ORDER);
    foreach ($aMatches as $aMatch) {
        $sResult = '';
        foreach ($aPartitions as $sPartitionName) {
            $sResult .= str_replace('-partition-', $sPartitionName, $aMatch[1]);
        }
        $sTemplate = str_replace($aMatch[0], $sResult, $sTemplate);
    }

    pgsqlRunScript($sTemplate);
}

function pgsqlRunRestoreData($sDumpFile)
{
    // Convert database DSN to psql parameters
    $aDSNInfo = DB::parseDSN(CONST_Database_DSN);
    if (!isset($aDSNInfo['port']) || !$aDSNInfo['port']) $aDSNInfo['port'] = 5432;
    $sCMD = 'pg_restore -p '.$aDSNInfo['port'].' -d '.$aDSNInfo['database'].' -Fc -a '.$sDumpFile;

    $aDescriptors = array(
                     0 => array('pipe', 'r'),
                     1 => array('pipe', 'w'),
                     2 => array('file', '/dev/null', 'a')
                    );
    $ahPipes = null;
    $hProcess = proc_open($sCMD, $aDescriptors, $ahPipes);
    if (!is_resource($hProcess)) fail('unable to start pg_restore');

    fclose($ahPipes[0]);

    // TODO: error checking
    while (!feof($ahPipes[1])) {
        echo fread($ahPipes[1], 4096);
    }
    fclose($ahPipes[1]);

    $iReturn = proc_close($hProcess);
}

function pgsqlRunDropAndRestore($sDumpFile)
{
    // Convert database DSN to psql parameters
    $aDSNInfo = DB::parseDSN(CONST_Database_DSN);
    if (!isset($aDSNInfo['port']) || !$aDSNInfo['port']) $aDSNInfo['port'] = 5432;
    $sCMD = 'pg_restore -p '.$aDSNInfo['port'].' -d '.$aDSNInfo['database'].' -Fc --clean '.$sDumpFile;

    $aDescriptors = array(
                     0 => array('pipe', 'r'),
                     1 => array('pipe', 'w'),
                     2 => array('file', '/dev/null', 'a')
                    );
    $ahPipes = null;
    $hProcess = proc_open($sCMD, $aDescriptors, $ahPipes);
    if (!is_resource($hProcess)) fail('unable to start pg_restore');

    fclose($ahPipes[0]);

    // TODO: error checking
    while (!feof($ahPipes[1])) {
        echo fread($ahPipes[1], 4096);
    }
    fclose($ahPipes[1]);

    $iReturn = proc_close($hProcess);
}

function passthruCheckReturn($cmd)
{
    $result = -1;
    passthru($cmd, $result);
    if ($result != 0) fail('Error executing external command: '.$cmd);
}

function replace_tablespace($sTemplate, $sTablespace, $sSql)
{
    if ($sTablespace) {
        $sSql = str_replace($sTemplate, 'TABLESPACE "'.$sTablespace.'"', $sSql);
    } else {
        $sSql = str_replace($sTemplate, '', $sSql);
    }

    return $sSql;
}

function create_sql_functions($aCMDResult)
{
    $sTemplate = file_get_contents(CONST_BasePath.'/sql/functions.sql');
    $sTemplate = str_replace('{modulepath}', CONST_InstallPath.'/module', $sTemplate);
    if ($aCMDResult['enable-diff-updates']) {
        $sTemplate = str_replace('RETURN NEW; -- %DIFFUPDATES%', '--', $sTemplate);
    }
    if ($aCMDResult['enable-debug-statements']) {
        $sTemplate = str_replace('--DEBUG:', '', $sTemplate);
    }
    if (CONST_Limit_Reindexing) {
        $sTemplate = str_replace('--LIMIT INDEXING:', '', $sTemplate);
    }
    if (!CONST_Use_US_Tiger_Data) {
        $sTemplate = str_replace('-- %NOTIGERDATA% ', '', $sTemplate);
    }
    if (!CONST_Use_Aux_Location_data) {
        $sTemplate = str_replace('-- %NOAUXDATA% ', '', $sTemplate);
    }
    pgsqlRunScript($sTemplate);
}