<?php

class WebAppRaiserDB {
	
	public function __construct() {
		
	}

	public static function matchFieldsToSave($fields, $valid_fields, $inner_id = 'id')
	{
		$return = array(
			'fields_to_save' => array(),
			'field_names' => '',
			'field_values' => '',
			'field_set' => '',
		);
		
		foreach ($valid_fields as $input_field_name => $db_field_name) {
			if (isset($fields[$input_field_name])){
				$return['field_names'] .= "`$db_field_name`, ";
				$return['field_values'] .= "'$fields[$input_field_name]', ";
				if($db_field_name != $inner_id)
					$return['field_set'] .= "$db_field_name='$fields[$input_field_name]', ";
				$return['fields_to_save'][$db_field_name] = $fields[$input_field_name];
			}
			elseif(isset($fields[$db_field_name])){
				$return['field_names'] .= "`$db_field_name`, ";
				$return['field_values'] .= "'$fields[$db_field_name]', ";
				if($db_field_name != $inner_id)
					$return['field_set'] .= "$db_field_name='$fields[$db_field_name]', ";
				$return['fields_to_save'][$db_field_name] = $fields[$db_field_name];
			}
		}
		$return['field_names'] = trim($return['field_names'], ", ");
		$return['field_values'] = trim($return['field_values'], ", ");
		$return['field_set'] = trim($return['field_set'], ", ");
		return $return;
	}

	public static function save($table, $fields, $valid_fields, $inner_id = "id")
	{
		$match_fields = self::matchFieldsToSave($fields, $valid_fields);

		if (empty($match_fields['fields_to_save'][$inner_id])) {
			$sql = "INSERT INTO `$table` ($match_fields[field_names]) VALUES ($match_fields[field_values])";
			mysql_query($sql);
			$id = mysql_insert_id();
		}
		else {
			$id = $match_fields['fields_to_save'][$inner_id];
			$t = self::select($table, $inner_id, $id);
			if(empty($t)){
				$sql = "INSERT INTO `$table` ($match_fields[field_names]) VALUES ($match_fields[field_values])";
			}
			else {
				$sql = "UPDATE `$table` SET $match_fields[field_set] WHERE $inner_id=$id";
			}
			mysql_query($sql);
		}
		return $id;
	}
	
	public static function select($table, $col_name, $col_value = NULL, $operator = '=') 
	{
		if(is_null($col_value)){
			$sql = "SELECT * FROM $table";
		}
		else {
			if(is_numeric($col_value)){
				$sql = sprintf('SELECT * FROM `%s` WHERE `%s`%s%d', $table, $col_name, $operator, $col_value);
			}
			elseif(is_string($col_value)){
				$sql = sprintf('SELECT * FROM `%s` WHERE `%s`%s"%s"', $table, $col_name, $operator, $col_value);
			}
			else {
				$sql = '';
			}
		}
		
		$res = mysql_query($sql);
		$num_rows = mysql_num_rows($res);

		if ($num_rows == 0) {
			$return = [];
		}
		elseif($num_rows == 1){
			$return[0] = mysql_fetch_assoc($res);
		}
		else {
			while ($row = mysql_fetch_assoc($res)) {
				$return[] = $row;
			}
		}
		return $return;
	}

	public static function delete($table, $col_name, $col_value, $is_numeric = true)
	{
		if($is_numeric && is_numeric($col_value) && $col_value > 0) {
			$sql = "DELETE FROM `$table` WHERE $col_name=$col_value";
			mysql_query($sql);
			return mysql_affected_rows();
		}
		elseif(!$is_numeric && is_string($col_value)){
			$sql = "DELETE FROM `$table` WHERE $col_name='$col_value'";
			mysql_query($sql);
			return mysql_affected_rows();
		}
		else {
			return 0;
		}
	}


	public function get($name){
		if(isset($this->$name)) {
			return $this->$name;
		}
		else {
			return false;
		}
	}

}