<?php

namespace TablePress\PhpOffice\PhpSpreadsheet\Calculation\MathTrig;

use TablePress\PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Exception;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Functions;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;

class Floor
{
	use ArrayEnabled;

	private static function floorCheck1Arg(): void
	{
		$compatibility = Functions::getCompatibilityMode();
		if ($compatibility === Functions::COMPATIBILITY_EXCEL) {
			throw new Exception('Excel requires 2 arguments for FLOOR');
		}
	}

	/**
	 * FLOOR.
	 *
	 * Rounds number down, toward zero, to the nearest multiple of significance.
	 *
	 * Excel Function:
	 *        FLOOR(number[,significance])
	 *
	 * @param mixed $number Expect float. Number to round
	 *                      Or can be an array of values
	 * @param mixed $significance Expect float. Significance
	 *                      Or can be an array of values
	 *
	 * @return array|float|string Rounded Number, or a string containing an error
	 *         If an array of numbers is passed as an argument, then the returned result will also be an array
	 *            with the same dimensions
	 */
	public static function floor($number, $significance = null)
	{
		if (is_array($number) || is_array($significance)) {
			return self::evaluateArrayArguments([self::class, __FUNCTION__], $number, $significance);
		}

		if ($significance === null) {
			self::floorCheck1Arg();
		}

		try {
			$number = Helpers::validateNumericNullBool($number);
			$significance = Helpers::validateNumericNullSubstitution($significance, ($number < 0) ? -1 : 1);
		} catch (Exception $e) {
			return $e->getMessage();
		}

		return self::argumentsOk((float) $number, (float) $significance);
	}

	/**
	 * FLOOR.MATH.
	 *
	 * Round a number down to the nearest integer or to the nearest multiple of significance.
	 *
	 * Excel Function:
	 *        FLOOR.MATH(number[,significance[,mode]])
	 *
	 * @param mixed $number Number to round
	 *                      Or can be an array of values
	 * @param mixed $significance Significance
	 *                      Or can be an array of values
	 * @param mixed $mode direction to round negative numbers
	 *                      Or can be an array of values
	 *
	 * @return array|float|string Rounded Number, or a string containing an error
	 *         If an array of numbers is passed as an argument, then the returned result will also be an array
	 *            with the same dimensions
	 */
	public static function math($number, $significance = null, $mode = 0)
	{
		if (is_array($number) || is_array($significance) || is_array($mode)) {
			return self::evaluateArrayArguments([self::class, __FUNCTION__], $number, $significance, $mode);
		}

		try {
			$number = Helpers::validateNumericNullBool($number);
			$significance = Helpers::validateNumericNullSubstitution($significance, ($number < 0) ? -1 : 1);
			$mode = Helpers::validateNumericNullSubstitution($mode, null);
		} catch (Exception $e) {
			return $e->getMessage();
		}

		return self::argsOk((float) $number, (float) $significance, (int) $mode);
	}

	/**
	 * FLOOR.PRECISE.
	 *
	 * Rounds number down, toward zero, to the nearest multiple of significance.
	 *
	 * Excel Function:
	 *        FLOOR.PRECISE(number[,significance])
	 *
	 * @param array|float $number Number to round
	 *                      Or can be an array of values
	 * @param array|float $significance Significance
	 *                      Or can be an array of values
	 *
	 * @return array|float|string Rounded Number, or a string containing an error
	 *         If an array of numbers is passed as an argument, then the returned result will also be an array
	 *            with the same dimensions
	 */
	public static function precise($number, $significance = 1)
	{
		if (is_array($number) || is_array($significance)) {
			return self::evaluateArrayArguments([self::class, __FUNCTION__], $number, $significance);
		}

		try {
			$number = Helpers::validateNumericNullBool($number);
			$significance = Helpers::validateNumericNullSubstitution($significance, null);
		} catch (Exception $e) {
			return $e->getMessage();
		}

		return self::argumentsOkPrecise((float) $number, (float) $significance);
	}

	/**
	 * Avoid Scrutinizer problems concerning complexity.
	 *
	 * @return float|string
	 */
	private static function argumentsOkPrecise(float $number, float $significance)
	{
		if ($significance == 0.0) {
			return ExcelError::DIV0();
		}
		if ($number == 0.0) {
			return 0.0;
		}

		return floor($number / abs($significance)) * abs($significance);
	}

	/**
	 * Avoid Scrutinizer complexity problems.
	 *
	 * @return float|string Rounded Number, or a string containing an error
	 */
	private static function argsOk(float $number, float $significance, int $mode)
	{
		if (!$significance) {
			return ExcelError::DIV0();
		}
		if (!$number) {
			return 0.0;
		}
		if (self::floorMathTest($number, $significance, $mode)) {
			return ceil($number / $significance) * $significance;
		}

		return floor($number / $significance) * $significance;
	}

	/**
	 * Let FLOORMATH complexity pass Scrutinizer.
	 */
	private static function floorMathTest(float $number, float $significance, int $mode): bool
	{
		return Helpers::returnSign($significance) == -1 || (Helpers::returnSign($number) == -1 && !empty($mode));
	}

	/**
	 * Avoid Scrutinizer problems concerning complexity.
	 *
	 * @return float|string
	 */
	private static function argumentsOk(float $number, float $significance)
	{
		if ($significance == 0.0) {
			return ExcelError::DIV0();
		}
		if ($number == 0.0) {
			return 0.0;
		}
		if (Helpers::returnSign($significance) == 1) {
			return floor($number / $significance) * $significance;
		}
		if (Helpers::returnSign($number) == -1 && Helpers::returnSign($significance) == -1) {
			return floor($number / $significance) * $significance;
		}

		return ExcelError::NAN();
	}
}
