<?php

$g_bu_table = array();
$g_bu_colIdxs = array();

ensure_cached_table( $g_bu_colIdxs );


/**
 * Clears all cached data. This is called after any DB updates. It can be called at any time since loading is lazy.
 */
function clear_cached_data(){
	
	global $g_bu_states;
	global $g_bu_table;
	
	$g_bu_states = null;
	$g_bu_table = array();

	debug_println("cache cleared", DEBUG_MED );
}

/**
 * Make sure that the main table data is populated
 */
function ensure_cached_table( &$colIdxs = null){
	global $g_bu_table;
	if(count($g_bu_table)>0) return;
	getbu_list_all( $g_bu_table, $colIdxs, 'order by BU_DATE desc, BU_TIME desc' );
	debug_println("cache loaded", DEBUG_MED );	
}


/**
 * Reload a single record by buid. The new row is returned by ref.
 */
function &reload_cached_rec( $buid ){

	global $g_bu_table;	
	global $g_bu_colIdxs;

	$row = getbu_row( $buid, $g_bu_colIdxs );

	for( $i=0; $i<count($g_bu_table); $i++){
		if($g_bu_table[ $i ][ $g_bu_colIdxs['BUID']] == $row[$g_bu_colIdxs['BUID']]){
			$g_bu_table[ $i ] = $row;
			return $g_bu_table[ $i ];
		}
	}
	
}

/**
 * Returns a reference to the row with the given buid.
 */
function &find_rec_by_id( $buid ){

	global $g_bu_table;	
	global $g_bu_colIdxs;

	for( $i=0; $i<count($g_bu_table); $i++){
		if($g_bu_table[ $i ][ $g_bu_colIdxs['BUID']] == $buid ){
			return $g_bu_table[ $i ];
		}
	}
	debug_println("rec not found($buid). Count is ".count($g_bu_table), DEBUG_MED );	

	return null;
}

/**
 * Delete a single record from the cache.
 */
function delete_cached_rec( $buid ){

	global $g_bu_table;	
	global $g_bu_colIdxs;

	for( $i=0; $i<count($g_bu_table); $i++){
		if($g_bu_table[ $i ][ $g_bu_colIdxs['BUID']] = $buid ){
			unset($g_bu_table[ $i ]);
			return;
		}
	}
	
}

?>