<?php
class ModelExtensionModuleAqeGeneral extends Model {
	protected static $count = 0;

	protected function filterInterval($filter, $field, $date=false) {
		if ($date) {
			if (preg_match('/^(!=|<>)\s*(\d{2,4}-\d{1,2}-\d{1,2})$/', html_entity_decode(trim($filter)), $matches) && count($matches) == 3) {
				return "DATE($field) <> DATE('" . $matches[2] . "')";
			} else if (preg_match('/^(\d{2,4}-\d{1,2}-\d{1,2})\s*(<|<=)\s*(\d{2,4}-\d{1,2}-\d{1,2})$/', html_entity_decode(trim($filter)), $matches) && count($matches) == 4 && strtotime($matches[1]) <= strtotime($matches[3])) {
				return "DATE('" . $matches[1] . "') ${matches[2]} DATE($field) AND DATE($field) ${matches[2]} DATE('" . $matches[3] . "')";
			} else if (preg_match('/^(\d{2,4}-\d{1,2}-\d{1,2})\s*(>|>=)\s*(\d{2,4}-\d{1,2}-\d{1,2})$/', html_entity_decode(trim($filter)), $matches) && count($matches) == 4 && strtotime($matches[1]) >= strtotime($matches[3])) {
				return "DATE('" . $matches[1] . "') ${matches[2]} DATE($field) AND DATE($field) ${matches[2]} DATE('" . $matches[3] . "')";
			} else if (preg_match('/^(<|<=|>|>=)\s*(\d{2,4}-\d{1,2}-\d{1,2})$/', html_entity_decode(trim($filter)), $matches) && count($matches) == 3) {
				return "DATE($field) ${matches[1]} DATE('" . $matches[2] . "')";
			} else if (preg_match('/^(\d{2,4}-\d{1,2}-\d{1,2})\s*(>|>=|<|<=)$/', html_entity_decode(trim($filter)), $matches) && count($matches) == 3) {
				return "DATE('" . $matches[1] . "') ${matches[2]} DATE($field)";
			} else {
				return "DATE(${field}) = DATE('${filter}')";
			}
		} else {
			if (preg_match('/^(!=|<>)\s*(-?\d+\.?\d*)$/', html_entity_decode(trim(str_replace(",", ".", $filter))), $matches) && count($matches) == 3) {
				return "$field <> '" . (float)$matches[2] . "'";
			} else if (preg_match('/^(-?\d+\.?\d*)\s*(<|<=)\s*(-?\d+\.?\d*)$/', html_entity_decode(trim(str_replace(",", ".", $filter))), $matches) && count($matches) == 4 && (float)$matches[1] <= (float)$matches[3]) {
				return "'" . (float)$matches[1] . "' ${matches[2]} $field AND $field ${matches[2]} '" . (float)$matches[3] . "'";
			} else if (preg_match('/^(-?\d+\.?\d*)\s*(>|>=)\s*(-?\d+\.?\d*)$/', html_entity_decode(trim(str_replace(",", ".", $filter))), $matches) && count($matches) == 4 && (float)$matches[1] >= (float)$matches[3]) {
				return "'" . (float)$matches[1] . "' ${matches[2]} $field AND $field ${matches[2]} '" . (float)$matches[3] . "'";
			} else if (preg_match('/^(<|<=|>|>=)\s*(-?\d+\.?\d*)$/', html_entity_decode(trim(str_replace(",", ".", $filter))), $matches) && count($matches) == 3) {
				return "$field ${matches[1]} '" . (float)$matches[2] . "'";
			} else if (preg_match('/^(-?\d+\.?\d*)\s*(>|>=|<|<=)$/', html_entity_decode(trim(str_replace(",", ".", $filter))), $matches) && count($matches) == 3) {
				return "'" . (float)$matches[1] . "' ${matches[2]} $field";
			} else {
				return $field . " = '" . $this->db->escape($filter) . "'";
			}
		}
	}

	protected function parseExpression($matches) {
		$operator = $matches['operator'];
		if (array_key_exists("percent", $matches)) {
			$operand = (float)$matches['operand'] / 100;
			if ($operator == '+') {
				$operator = '*';
				$operand += 1;
			} else if ($operator == '-') {
				$operator = '*';
				$operand = 1 - $operand;
			}
		} else {
			$operand = $matches['operand'];
		}
		$operand = strval($operand);
		return array($operator, $operand);
	}
}