<?php

namespace PhpOffice\PhpSpreadsheetTests\Custom;

use Complex\Complex;

class ComplexAssert
{
    private $errorMessage = '';

    private function testExpectedExceptions($expected, $actual)
    {
        //    Expecting an error, so we do a straight string comparison
        if ($expected === $actual) {
            return true;
        } elseif ($expected === INF && $actual === 'INF') {
            return true;
        }
        $this->errorMessage = 'Expected Error: ' . $actual . ' !== ' . $expected;

        return false;
    }

    private function adjustDelta($expected, $actual, $delta)
    {
        $adjustedDelta = $delta;

        if (abs($actual) > 10 && abs($expected) > 10) {
            $variance = floor(log10(abs($expected)));
            $adjustedDelta *= pow(10, $variance);
        }

        return $adjustedDelta > 1.0 ? 1.0 : $adjustedDelta;
    }

    public function assertComplexEquals($expected, $actual, $delta = 0)
    {
        if ($expected === INF || (is_string($expected) && $expected[0] === '#')) {
            return $this->testExpectedExceptions($expected, $actual);
        }

        $expectedComplex = new Complex($expected);
        $actualComplex = new Complex($actual);

        if (!is_numeric($actualComplex->getReal()) || !is_numeric($expectedComplex->getReal())) {
            if ($actualComplex->getReal() !== $expectedComplex->getReal()) {
                $this->errorMessage = 'Mismatched String: ' . $actualComplex->getReal() . ' !== ' . $expectedComplex->getReal();

                return false;
            }

            return true;
        }

        $adjustedDelta = $this->adjustDelta($expectedComplex->getReal(), $actualComplex->getReal(), $delta);
        if (abs($actualComplex->getReal() - $expectedComplex->getReal()) > $adjustedDelta) {
            $this->errorMessage = 'Mismatched Real part: ' . $actualComplex->getReal() . ' != ' . $expectedComplex->getReal();

            return false;
        }

        $adjustedDelta = $this->adjustDelta($expectedComplex->getImaginary(), $actualComplex->getImaginary(), $delta);
        if (abs($actualComplex->getImaginary() - $expectedComplex->getImaginary()) > $adjustedDelta) {
            $this->errorMessage = 'Mismatched Imaginary part: ' . $actualComplex->getImaginary() . ' != ' . $expectedComplex->getImaginary();

            return false;
        }

        if ($actualComplex->getSuffix() !== $actualComplex->getSuffix()) {
            $this->errorMessage = 'Mismatched Suffix: ' . $actualComplex->getSuffix() . ' != ' . $expectedComplex->getSuffix();

            return false;
        }

        return true;
    }

    public function getErrorMessage()
    {
        return $this->errorMessage;
    }
}